Satellite communication transceivers, network switching control methods, devices and media

Abstract

This application provides a satellite communication transceiver, network switching control method, device, and medium, relating to the field of satellite communication technology. It solves the problem of difficulty in quickly switching satellite communication networks in related technologies. This solution is compatible with the requirements of different Ku-band satellite communication networks, establishes a downlink hot backup for the terminal, and provides two independent frequency selection switches on the uplink to convert the frequency to the radio frequency signals required by different satellite networks. Therefore, when switching between different satellite networks, there is no need to reconfigure and lock onto the satellite, effectively reducing the network switching time.

Description

Technical Field

[0001] This application relates to the field of satellite communication technology, and in particular to a satellite communication transceiver, network switching control method, device and medium. Background Technology

[0002] Traditional satellite communication terminals are used in geostationary or low-Earth orbit (LEO) satellite constellation networks. If the working network becomes unavailable or signal coverage is lost, the terminal will lose connection. In related technologies, some highly compatible LEO satellite communication terminals require software configuration to re-attract, lock onto, and re-apply for network access in order to switch between communication networks in different satellite orbits. Furthermore, terminal systems supporting communication across different satellite orbits or constellations require at least two different transceivers in a redundant configuration, resulting in larger terminal sizes and increased complexity in communication monitoring. However, the network switching process in these technologies takes a considerable amount of time to reconnect the terminal, making it difficult to efficiently achieve rapid switching between different satellite communication networks and thus failing to meet the needs of emergency response applications for rapid switching between satellite networks in different orbits. Summary of the Invention

[0003] This application provides a satellite communication transceiver, network switching control method, device, and medium, which solves the problem of difficulty in quickly switching satellite communication networks in related technologies. This solution is compatible with the requirements of different Ku-band satellite communication networks, establishes a downlink hot backup for the terminal, and provides two independent frequency-selective switch networks to convert the frequency to the radio frequency signal required by the working satellite network in the uplink. Therefore, when switching between different satellite networks, there is no need to reconfigure and lock onto the satellite, which effectively reduces the network switching time.

[0004] In one aspect, this application provides a satellite communication transceiver connected to a phased array antenna. The phased array antenna receives two beams pointing in different directions and outputs the two beams to the satellite communication transceiver through different output channels, as well as transmitting uplink signals. The satellite communication transceiver includes an MCU, a dual-channel down-conversion module, and an up-conversion module.

[0005] The MCU is connected to an external terminal controller via LVDS differential pair signal lines to establish a multi-channel parallel port communication connection with the terminal controller. The dual-channel downconversion module includes a first downconversion unit and a second downconversion unit. The input terminals of the first downconversion unit and the second downconversion unit are respectively connected to an output channel of a phased array antenna to access different beams. The receiving frequency range of the first downconversion unit includes a first frequency range corresponding to the synchronous orbit communication network and a second frequency range corresponding to the first target network in the low orbit communication network. The receiving frequency range of the second downconversion unit includes the first frequency range corresponding to the synchronous orbit communication network, the second frequency range corresponding to the first target network in the low orbit communication network, and a third frequency range corresponding to the second target network in the low orbit communication network. The reference input terminal of the first downconverter unit is used to input an internal reference signal. The reference input terminal of the second downconverter unit is provided with a first reference switch and a second reference switch. The moving contact of the first reference switch is used to input an external reference signal. The first stationary contact of the first reference switch is connected to the first stationary contact of the second reference switch. The second stationary contact of the first reference switch is connected to a grounded load resistor. The second stationary contact of the second reference switch is used to input an internal reference signal. The control terminals of the first and second reference switches are both connected to the first control pin of the MCU. The first input terminal of the upconverter module is equipped with an intermediate frequency switch for selecting an intermediate frequency signal, and the second input terminal of the upconverter module is equipped with a third reference switch for selecting a reference signal. The control terminals of the intermediate frequency switch and the third reference switch are both connected to the second control pin of the MCU. The two stationary contacts of the intermediate frequency switch are used to connect to the intermediate frequency signal of the corresponding second target network and the intermediate frequency signal of the corresponding synchronous track communication network or the first target network, respectively. The two stationary contacts of the third reference switch are used to connect to the reference signal of the corresponding second target network and the reference signal of the corresponding synchronous track communication network or the first target network, respectively.

[0006] Secondly, this application also provides a network handover control method, which includes: When the device is powered on, in response to receiving a query request signal sent by the terminal controller via the LVDS differential pair signal line, it sends a feedback signal to the terminal controller to establish a communication connection. Based on historical configuration information, the dual-channel downconversion module and upconversion module are initialized and configured. The historical configuration information is the configuration parameters of all phase-locked loop registers in the satellite communication transceiver before the last power-off. Based on the mode information received from the terminal controller, determine the selected network mode, local oscillator address information, and local oscillator switching enable signal; Based on the network mode, local oscillator address information, and local oscillator switching enable signal, the local oscillator frequency and attenuation of the dual-channel downconverter module and upconverter module are adjusted via the SPI bus, and the selection states of the first reference switch, second reference switch, third reference switch, and intermediate frequency switch are controlled to determine the main working network and backup network. The dual-channel downconversion module receives different beams, enabling the terminal controller to perform satellite lock-in and continuous tracking operations on the main working network and backup network, and to complete the network access application and establish communication connection for the main working network and backup network. In response to receiving the mode information for switching, the local oscillator frequency of the upconverter module is adjusted via the SPI bus, and the gating states of the third reference switch and the intermediate frequency switch are controlled to make the backup network the new main working network.

[0007] Thirdly, this application also provides a network switching control device, which includes: The connection establishment module is configured to, when the device is powered on, send a feedback signal to the terminal controller to establish a communication connection in response to receiving a query request signal sent by the terminal controller through the LVDS differential pair signal line; The initialization module is configured to initialize the dual-channel downconversion module and upconversion module based on historical configuration information. The historical configuration information is the configuration parameters of all phase-locked loop registers in the satellite communication transceiver before the last power-off. The signal parsing module is configured to determine the selected network mode, local oscillator address information, and local oscillator switching enable signal based on the mode information received from the terminal controller. The parameter configuration module is configured to adjust the local oscillator frequency and attenuation of the dual-channel downconverter module and upconverter module via the SPI bus according to the network mode, local oscillator address information and local oscillator switching enable signal, and control the selection state of the first reference switch, second reference switch, third reference switch and intermediate frequency switch to determine the main working network and backup network. The signal receiving module is configured to receive different beams through a dual-channel down-conversion module, so that the terminal controller can perform satellite locking and continuous tracking operations on the main working network and backup network, and complete the network access application and establish communication connection for the main working network and backup network. The network switching module is configured to, in response to receiving mode information for switching, adjust the local oscillator frequency of the upconverter module via the SPI bus and control the gating state of the third reference switch and the intermediate frequency switch, so as to use the backup network as the new main working network.

[0008] Fourthly, this application also provides a storage medium for storing computer-executable instructions, which, when executed by a processor, are used to execute the network switching control method of this application.

[0009] The satellite communication transceiver in this solution enables the satellite communication terminal to be compatible with the requirements of different Ku-band satellite communication networks, establishes a downlink hot backup for the terminal, and provides two independent frequency selection switch networks for up-conversion to the radio frequency signals required by different satellite networks. Therefore, when switching between different satellite networks, there is no need to reconfigure and lock onto the satellite, effectively reducing the network switching time. Attached Figure Description

[0010] Figure 1 This is a structural block diagram of a satellite communication terminal provided in an embodiment of this application.

[0011] Figure 2 This is a schematic diagram of the structure of a dual-channel downconverter module provided in an embodiment of this application.

[0012] Figure 3 This is a schematic diagram of the structure of an upconversion module provided in an embodiment of this application.

[0013] Figure 4 This is a schematic diagram illustrating the steps of a network switching control method provided in an embodiment of this application.

[0014] Figure 5 This is a schematic diagram showing the test results of the radiation of the transmission line in the relevant technical solution without special shielding treatment.

[0015] Figure 6 This is a schematic diagram showing the test results of the radiation from the transmission line of this application without special shielding treatment.

[0016] Figure 7 This is a schematic diagram showing the time consumption detection results of network switching on an upconversion link provided in an embodiment of this application.

[0017] Figure 8 This is a schematic diagram of the time consumption detection results for network switching of an upconversion link provided in another embodiment of this application.

[0018] Figure 9 This is a schematic diagram showing the time consumption detection results of network switching on a downconversion link provided in an embodiment of this application.

[0019] Figure 10 This is a schematic diagram showing the time consumption detection results of network switching on a downconversion link provided in another embodiment of this application.

[0020] Figure 11 This is a schematic diagram of the structure of a network switching control device provided in an embodiment of this application. Detailed Implementation

[0021] The embodiments of this application will be further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are merely illustrative of the embodiments of this application and are not intended to limit the scope of this application. Furthermore, it should be noted that, for ease of description, the accompanying drawings only show the parts related to the embodiments of this application, not all structures. Those skilled in the art, after reading this specification, should be able to conceive that any combination of technical features can constitute an optional implementation method, provided that the technical features do not contradict each other.

[0022] The terms "first," "second," etc., used in the specification and claims of this application are used to distinguish similar objects, not to describe a specific order or sequence. It should be understood that such use of data can be interchanged where appropriate so that embodiments of this application can be implemented in orders other than those illustrated or described herein, and the objects distinguished by "first," "second," etc., are generally of the same class, not limited in number; for example, a first object can be one or more. Furthermore, in the specification and claims, "and / or" indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship. In the description of this application, "multiple" means two or more, and "several" means one or more.

[0023] Traditional satellite communication terminals are designed for single networks, such as those in geostationary orbit or low-Earth orbit (LEO) constellations. If the operating network becomes unavailable or signal coverage is poor, the terminal loses connection. Some technologies that support both high and low orbit satellite communication terminals require software configuration to re-homing, locking onto, and re-apply for network access, enabling switching between different satellite orbit communication networks. However, this switching process often takes several minutes, hindering rapid switching between networks. In fields where satellite communication technology is widely used, especially those requiring high throughput, high redundancy, and high real-time performance, such as emergency response and disaster relief, rapid switching between different orbital satellite networks is crucial.

[0024] However, terminal systems supporting communication with different satellite orbits or constellations require a redundant combination of at least two different transceivers. These systems are large, complex to monitor, and inconvenient to use. Furthermore, network switching between terminals takes a considerable amount of time to reconnect. Additionally, traditional communication between transceivers and terminal controllers typically uses RS232, RS422, RS485, and Ethernet for monitoring. This communication method often takes about 4ms for command transmission and polling upon receiving a command, which cannot meet the requirements for microsecond-level rapid switching.

[0025] In response, this application provides a satellite communication transceiver, a network switching control method, an apparatus, and a medium. The satellite communication transceiver of this solution is based on a dual down-conversion channel and a single hybrid up-conversion radio frequency link to achieve continuous downlink tracking of satellites with different orbits and sharing of uplink and downlink antenna pointing information. Furthermore, through network switching control, the access signal and frequency are adjusted to achieve rapid switching between different satellite communication systems, providing stable and reliable communication guarantees for application scenarios with high real-time requirements.

[0026] Figure 1 The figure shows a structural block diagram of a satellite communication terminal provided in an embodiment of this application. The satellite communication terminal includes an antenna controller (not shown), a phased array antenna 210, a terminal controller 220, a satellite communication transceiver 230, and a modem (not shown). The satellite communication transceiver 230 includes an MCU (Microcontroller Unit) 110, a dual-channel down-conversion module 120, and an up-conversion module 130. The MCU 110 serves as the control unit within the satellite communication transceiver 230. The MCU 110 is connected to the terminal controller 220 via LVDS (Low-Voltage Differential Signaling) differential pair signal lines for multi-channel parallel communication. The phased array antenna 210 receives two beams pointing in different directions and transmits them to subsequent stages through different output channels. It is conceivable that the two beams pointing in different directions correspond to radio frequency signals from different satellite communication networks, and their frequency ranges are not the same. The dual-channel downconversion module 120 includes a first downconversion unit and a second downconversion unit. The first downconversion unit and the second downconversion unit each serve as a downconversion link, and the input terminals of the first downconversion unit and the second downconversion unit are respectively connected to an output channel of the phased array antenna 210 to access different beams.

[0027] For example, the phased array antenna 210 includes a receiving antenna, an LNA (Low Noise Amplifier), a power divider, two variable attenuators (ATTs), and two phase shifters. The two beams with different directions received by the receiving antenna are transmitted to different output channels through the power divider. In each output channel, the beams are attenuated by the variable attenuator and phase-shifted by the phase shifter before entering the first down-conversion unit and the second down-conversion unit, respectively.

[0028] It is understood that within the low-Earth orbit (LEO) communication network, there exists a network adapted to the same reference signal as the geostationary orbit (GEO) communication network, namely the first target network; and other networks within the LEO communication network adapted to a different reference signal serve as the second target network. Furthermore, the receiving frequency range of the first down-conversion unit includes the first frequency range corresponding to the GEO communication network and the second frequency range corresponding to the first target network within the LEO communication network. The receiving frequency range of the second down-conversion unit includes the first frequency range corresponding to the GEO communication network, the second frequency range corresponding to the first target network within the LEO communication network, and the third frequency range corresponding to the second target network within the LEO communication network; that is, the second down-conversion unit can cover the receiving frequency range of the first down-conversion unit. Moreover, the output of the first down-conversion unit is used to connect to a first modem, and the first down-converter unit is used to down-convert the received beam to the first receiving power range of the first modem, so that the satellite communication terminal can acquire the intermediate frequency (IF) signal of the corresponding GEO communication network or the first target network. The output of the second downconversion unit is used to connect to the second modem. The second downconversion unit is used to downconvert the received beam to the second receiving power range of the second modem so that the satellite communication terminal can obtain the corresponding intermediate frequency signal, such as the intermediate frequency signal of the corresponding geostationary orbit communication network, the first target network or the second target network.

[0029] Furthermore, the reference input terminal of the first down-converter unit is used to receive an internal reference signal, the frequency of which is adapted to the local oscillator frequency of the synchronous track communication network and the first target network. The reference input terminal of the second down-converter unit is equipped with a first reference switch and a second reference switch. The moving contact of the first reference switch is used to receive an external reference signal, the frequency of which is adapted to the local oscillator frequency of the second target network in the near-track communication network. The first stationary contact of the first reference switch is connected to the first stationary contact of the second reference switch, and the second stationary contact of the first reference switch is connected to a grounded load resistor. The second stationary contact of the second reference switch is used to receive the internal reference signal.

[0030] The control terminals of both the first and second reference switches are connected to the first control pin of the MCU110. It is conceivable that both the first and second reference switches are single-pole double-throw RF switches. The stationary contact is fixed in the structure and does not move, while the moving contact (which also serves as the common terminal of the switch) is the contact that generates mechanical movement and makes contact with or separates from the stationary contact. Understandably, through the connection structure of the first and second reference switches and the synchronous control of the two switches by the MCU110, the reference input terminal of the second downconverter unit has two signal input scenarios: when both the first and second reference switches are connected to their respective first stationary and moving contacts, the second downconverter unit receives an external reference signal; when both the first and second reference switches are connected to their respective second stationary and moving contacts, the second downconverter unit receives an internal reference signal, and the external reference signal is connected to the load resistor.

[0031] Understandably, the first down-conversion unit is used to receive radio frequency signals for which an internal reference signal is applicable, and the second down-conversion unit is used to receive radio frequency signals for which either an internal or external reference signal is applicable. For example, taking a geostationary orbit satellite communication network including GEO (Geostationary Earth Orbit) and a near-Earth orbit satellite communication network including Starlink and OneWeb (a global communication constellation composed of low-Earth orbit satellites) as an example, the internal reference signal is adapted to the GEO and Starlink networks, and the external reference signal is adapted to the OneWeb network. The receiving frequency range of the first down-conversion unit includes the signal frequencies corresponding to the GEO and Starlink networks (which are the first target networks in the low-Earth orbit satellite communication network), while the receiving power range of the second down-conversion unit includes the signal frequencies corresponding to the GEO, Starlink, and OneWeb networks (which are the second target networks in the low-Earth orbit satellite communication network).

[0032] The upconversion module 130, serving as the uplink of the satellite communication terminal, has an intermediate frequency (IF) switch at its first input for selecting an IF signal and a third reference switch at its second input for selecting a reference signal. Both the control terminals of the IF switch and the third reference switch are connected to the second control pin of the MCU 110. The two stationary contacts of the IF switch are used to connect to the IF signal of the corresponding second target network and the IF signal of the corresponding synchronous orbit communication network or the first target network, respectively. Similarly, the two stationary contacts of the third reference switch are used to connect to the reference signal of the corresponding second target network and the reference signal of the corresponding synchronous orbit communication network or the first target network, respectively. By switching the IF switch and the third reference switch, the upconversion module 130 can select the corresponding IF signal and reference signal. It should be noted that the IF signal and reference signal selected during each switch are matched to the current communication network, allowing the upconversion module 130 to upconvert the signal to the frequency range of the current communication network.

[0033] For example, the intermediate frequency (IF) selection network and reference selection network provided by the upconversion module are formed by bandpass filters and RF switches. Specifically, the first stationary contact of the IF switch is connected to the ninth bandpass filter, the first stationary contact of the third reference switch is connected to the eleventh bandpass filter, the second stationary contact of the IF switch is connected to the tenth bandpass filter, and the second stationary contact of the third reference switch is connected to the twelfth bandpass filter. The ninth and eleventh bandpass filters are both used to input a first mixed signal, and the tenth and twelfth bandpass filters are both used to input a second mixed signal. The first mixed signal includes the IF signal and reference signal of the second target network in the LEO communication network. The second mixed signal includes the IF signal and reference signal of the synchronous orbit communication network, or includes the IF signal and reference signal of the first target network in the LEO communication network. Furthermore, before the signal is input to the IF switch, the reference signal in the mixed signal is filtered out by the corresponding ninth or tenth bandpass filter; before the signal is input to the reference switch, the IF signal in the mixed signal is filtered out by the corresponding eleventh or twelfth bandpass filter.

[0034] In satellite communication terminals, the dual-channel down-conversion module within the transceiver forms a redundant receiving link through a first down-conversion unit and a second down-conversion unit. This ensures that the satellite communication terminal can lock onto and continuously track radio frequency signals from different satellite communication networks. For example, taking geostationary orbit satellite communication networks (GEO, Starlink, and OneWeb as examples), and near-Earth orbit satellite communication networks (Starlink and OneWeb as examples), the first down-conversion unit's receiving frequency range covers both the GEO and Starlink networks (serving as the first target network), while the second down-conversion unit's receiving frequency range covers GEO, Starlink, and OneWeb (serving as the second target network). Then, the two beams received by the antenna, after power division, attenuation, and phase shifting, are amplified and down-converted at the input terminals (i.e., radio frequency input ports) of the first and second down-conversion units, respectively, before being sent to the corresponding modems for digital demodulation. For example, the first down-conversion unit receives RF signals from the GEO network, and the second down-conversion unit receives RF signals from the OneWeb network. The satellite communication terminal simultaneously tracks and demodulates the RF signals from both satellite communication networks. It's conceivable that, depending on the actual application, either the first or second down-conversion unit can be selected as the primary working network link, while the other unit serves as a backup receiving link. If the first down-conversion unit is used as the primary working network link, referring to the example above, the GEO network becomes the primary working network, the OneWeb network becomes the backup network, and the second down-conversion unit then serves as the backup receiving link.

[0035] Through the aforementioned signal reception and demodulation operations, the primary working network's receiving link tracks and acquires the relative angle, direction, and position information of satellites within the primary network, while the backup receiving link continuously tracks and acquires the same information. Furthermore, the satellite communication terminal can access the intermediate frequency (IF) signal and reference signal corresponding to the primary working network via the up-conversion module of its transceiver, thereby up-converting the signal to the frequency band corresponding to the primary working network to obtain a radio frequency (RF) signal and establish a handshake connection with the corresponding satellite. Moreover, once a switch to the backup network is required, since the backup receiving link is in a hot backup state for the other network, the satellite communication terminal can determine the satellite direction and position information of the backup network without reconfiguration or satellite acquisition, and use it as the new primary working network. The up-conversion module can then be quickly switched to the new primary working network, allowing the transmitting antenna to directly lock onto the corresponding network's satellites. This reduces the time-consuming operations required for re-alignment and locking during network switching, effectively shortening the time required for network switching.

[0036] As can be seen from the above scheme, the dual-channel downconversion module in this satellite communication transceiver provides two downconversion links compatible with the differentiated requirements of different satellite communication networks, including those in different orbits. This allows for the downconversion and amplification of the RF signals received by the antenna from the dual-beam power divider and phase shifter, which are then continuously tracked and demodulated by demodulators in two different networks. This eliminates the need for reconfiguration, satellite locking, and connection requests during switching, achieving downlink hot backup for the terminal and reducing the time required to switch satellite communication networks. Compared to a single-channel transceiver, the dual-channel downconversion and dual-IF input upconversion have smaller changes in size and power consumption, and less impact on the overall system integration. Furthermore, the upconversion links of the satellite communication transceiver are compatible with the requirements of different Ku-band satellite communication networks and provide independent gating networks on the IF and reference links based on the different characteristics of each network. This effectively upconverts the signals to the RF signals required by different satellite networks, and the total switching time between different satellite communication networks is relatively short, helping to ensure communication connectivity and avoid communication interruptions.

[0037] In some embodiments, the first down-conversion unit includes a first low-noise amplifier, a first bandpass filter, a first frequency tracer component, a first low-pass filter, a first variable attenuator, a first intermediate frequency amplifier, a first high-pass filter, and a second bandpass filter. The input terminal of the first low-noise amplifier serves as the input terminal of the first down-conversion unit. The output terminal of the first low-noise amplifier is connected to the input terminal of the first bandpass filter. The output terminal of the first bandpass filter is connected to the RF input terminal of the first frequency tracer component. The intermediate frequency output terminal of the first frequency tracer component is connected to the input terminal of the first low-pass filter. The output terminal of the first low-pass filter is connected to the input terminal of the first variable attenuator. The output terminal of the first variable attenuator is connected to the input terminal of the first intermediate frequency amplifier. The output terminal of the first intermediate frequency amplifier is connected to the input terminal of the first high-pass filter. The output terminal of the first high-pass filter serves as the output terminal of the first down-conversion unit. The input terminal of the second bandpass filter is used to input an internal reference signal, and the output terminal of the second bandpass filter is connected to the reference input terminal of the first frequency tracer component.

[0038] The first frequency tracer component is used to phase-lock the input internal reference signal to obtain the local oscillator signal and mix the local oscillator signal with the input radio frequency signal to obtain the intermediate frequency signal. The first frequency tracer component is also used to adjust the gain attenuation. It can be imagined that the first frequency tracer component is a chipset integrating a phase-locked loop, a voltage-controlled oscillator, a mixer and a DSA (Digital Step Attenuator). The internal reference signal input to the reference input terminal generates a local oscillator signal through the phase-locked loop and the voltage-controlled oscillator to input the mixer. The local oscillator signal and the radio frequency signal input to the radio frequency input terminal are mixed by the mixer to obtain the intermediate frequency signal, and then attenuated by the DSA before being output.

[0039] Understandably, the radio frequency (RF) signal is amplified by a first low-noise amplifier to enable subsequent circuitry to process the signal. Simultaneously, the low-noise performance of the first RF amplifier minimizes the introduction of noise. A first bandpass filter removes out-of-band signals and performs image rejection, allowing the RF signal to be input to the RF input terminal of the first frequency tracer component. The internal reference signal, after being filtered for out-of-band signals by a second bandpass filter, is input to the reference input terminal of the first frequency tracer component. The first mixer tracer component processes the internal reference signal to obtain a local oscillator signal. This local oscillator signal is then mixed with the RF signal and input to a first low-pass filter to extract the generated intermediate frequency (IF) signal. The signal is then attenuated by a first variable attenuator for compensation, amplified by a first IF amplifier, and finally processed by a first high-pass filter before being transmitted to the first modem.

[0040] In some embodiments, the second downconversion unit includes a second low-noise amplifier, a third bandpass filter, a second frequency tracer, a second low-pass filter, a first switching switch, a second switching switch, a fourth bandpass filter, a third low-pass filter, a second variable attenuator, a second intermediate frequency amplifier, a first reference switch, a second reference switch, and a fifth bandpass filter. In this configuration, the input terminal of the second low-noise amplifier serves as the input terminal of the second down-conversion unit. The output terminal of the second low-noise amplifier is connected to the input terminal of the third band-pass filter. The output terminal of the third band-pass filter is connected to the RF input terminal of the second frequency tracer component. The IF output terminal of the second frequency tracer component is connected to the input terminal of the second low-pass filter. The output terminal of the second low-pass filter is connected to the moving contact of the first switching switch. The first stationary contact of the first switching switch is connected to the input terminal of the fourth band-pass filter. The second stationary contact of the first switching switch is connected to the input terminal of the third low-pass filter. The first stationary contact of the second switching switch is connected to the output terminal of the fourth band-pass filter. The second stationary contact of the second switching switch is connected to the output terminal of the third low-pass filter. The moving contact of the second switching switch is connected to the input terminal of the second variable attenuator. The control terminals of the first and second switching switches are both connected to the first control pin of the MCU. The output terminal of the second variable attenuator is connected to the input terminal of the second IF amplifier, which serves as the output terminal of the second down-conversion unit. The input terminal of the fifth band-pass filter is connected to the moving contact of the second reference switch. The output terminal of the fifth band-pass filter is connected to the reference input terminal of the second frequency tracer component.

[0041] The second frequency tracer component is used to phase-lock the input internal or external reference signal to obtain the local oscillator signal and mix the local oscillator signal with the input RF signal to obtain the intermediate frequency signal. The second frequency tracer component is also used to adjust the gain attenuation. It can be imagined that the second frequency tracer component is a chipset integrating a phase-locked loop, a voltage-controlled oscillator, a mixer, and a DSA. The internal or external reference signal input to the reference input terminal generates a local oscillator signal through the phase-locked loop and the voltage-controlled oscillator to input the mixer. The local oscillator signal and the RF signal input to the RF input terminal are mixed by the mixer to obtain the intermediate frequency signal, and then attenuated by the DSA before being output.

[0042] Understandably, the radio frequency (RF) signal is amplified by the second low-noise amplifier to enable subsequent circuitry to process the signal. Simultaneously, the low-noise performance of the second RF amplifier minimizes the introduction of noise. The third bandpass filter filters out out-of-band signals and inputs them to the second frequency tracer component. The second downconversion unit switches the selection states of the first and second reference switches, thereby transmitting the corresponding reference signal to the fifth bandpass filter, which then inputs the reference signal to the reference input terminal of the second frequency tracer component. Both the reference signal and the RF signal are input to the second frequency tracer component. After processing, the signal is input to the second low-pass filter to extract the generated intermediate frequency (IF) signal. The first and second switching switches are identical RF switches to the reference switches, and both are associated with the control of the second reference switch. By controlling the selection states of the first and second switching switches, the corresponding filtering channel is determined to match the satellite communication network currently matched by the second downconversion unit. The signal is attenuated by the second variable attenuator for compensation, and the signal gain is amplified by the second IF amplifier before being transmitted to the second modem.

[0043] Optionally, the ADMV4640 downconversion integrated chip can be used as the first and second frequency tracking components in the downconversion link described above. It integrates a phase-locked loop, a voltage-controlled oscillator, a mixer, and a DSA attenuator to achieve the corresponding functions. The chip is connected to the MCU via the SPI bus, and can be adjusted by the MCU to achieve functions such as adjusting the local oscillator frequency and the attenuation.

[0044] Figure 2The figure shows a schematic diagram of a dual-channel downconversion module provided in an embodiment of this application. As shown, the signal received from the receiving antenna ANT enters the first downconversion unit 121 and the second downconversion unit 122 respectively. In the first downconversion unit 121, the radio frequency signal is amplified by the first low-noise amplifier LNA1 and then transmitted to the first bandpass filter BPF1. The first bandpass filter BPF1 filters out out-of-band signals and inputs them to the first frequency trace component ChipSet1. The internal reference signal I_REF is filtered by the second bandpass filter BPF2 and then input to the first frequency trace component ChipSet1. After processing, the first frequency trace component ChipSet1 inputs the signal to the first low-pass filter LPF1 to extract the generated intermediate frequency signal. The signal is attenuated by the first variable attenuator ATT1 and amplified by the first intermediate frequency amplifier IF_PA1. After processing by the first high-pass filter HPF, the signal is transmitted to the first modem.

[0045] In the second down-conversion unit 122, the RF signal is amplified by the second low-noise amplifier LNA2 and then transmitted to the third bandpass filter BPF3. The third bandpass filter BPF3 filters out out-of-band signals and inputs them to the second frequency tracer component ChipSet2. The second down-conversion unit 122 switches the selection states of the first reference switch SW1 and the second reference switch SW2, and controls the power supply enable of the internal crystal oscillator via the first control pin through the internal MCU, keeping it in a disabled state to prevent interference between the two reference signals. This allows the corresponding reference signal to be transmitted to the fifth bandpass filter BPF5, and then input to the second frequency tracer component ChipSet2. After mixing by the second frequency tracer component ChipSet2, the signal is input to the second low-pass filter LPF2 to extract the generated intermediate frequency signal. By controlling the selection states of the first switching switch SW5 and the second switching switch SW6, the corresponding filtering channel is selected to match the satellite communication network currently matched by the second downconverter unit 122. The signal is attenuated by the second variable attenuator ATT2, and the signal gain is amplified by the second intermediate frequency amplifier IF_PA2 before being transmitted to the second modem.

[0046] Understandably, in the second down-conversion unit 122, the frequency of the external reference signal E_REF is adapted to the local oscillator frequency of the second target network in the near-orbit communication network, and the frequency of the internal reference signal I_REF is adapted to the local oscillator frequency of the first target network in the synchronous orbit communication network or the low-orbit communication network. By configuring the selection state of the first reference switch SW1 and the second reference switch SW2, a reference signal adapted to the current communication network can be provided. For example, when adapting to the first target network in the synchronous orbit communication network or the low-orbit communication network, the internal reference signal is connected; when adapting to the second target network in the low-orbit communication network, the external reference signal is connected. Furthermore, by configuring the selection states of the first switching switch SW5 and the second switching switch SW6, corresponding filtering channels are provided. For example, when the second downconversion unit 122 is used to process the second target network in the near-orbit satellite communication network, the filtering channel in the second downconversion unit 122 that passes through the fourth bandpass filter BPF4 is turned on; when the second downconversion unit 122 is used to process the first target network in the geostationary orbit satellite communication network or the near-orbit satellite communication network, the filtering channel in the second downconversion unit 122 that passes through the third low-pass filter LPF3 is turned on.

[0047] In response, the first down-conversion unit receives RF signals from the GEO network, and the second down-conversion unit receives RF signals from the Starlink network. Both down-conversion links use an internal reference signal I_REF for phase-locking. This is achieved by controlling the first reference switch SW1 to connect its first stationary contact and its moving contact, and by controlling the second reference switch SW2 to connect its first stationary contact and its moving contact, so that the second down-conversion unit 122 can access the internal reference signal I_REF. Furthermore, to adapt to the frequency response characteristics of different network channels and the gain requirements of the networks, the attenuation amounts in the two links also differ. This attenuation is adjusted by using frequency tracing components in the links.

[0048] Furthermore, the second down-conversion unit 122 is also compatible with a second target network in a near-orbit satellite communication network, such as the OneWeb network. When the second down-conversion unit 122 receives signals from the OneWeb network, it uses an external reference signal E_REF for phase-locked loop (PLL). This external reference signal E_REF is accessed into the second frequency tracking component ChipSet2 of the link by adjusting the selection states of the first reference switch SW1 and the second reference switch SW2. For example, by controlling the first reference switch SW1 to connect its second stationary contact and the second reference switch SW2 to connect its second stationary contact and the second reference switch SW2, the second down-conversion unit 122 can access the external reference signal E_REF. Due to the isolation of the reference switches, the continuous injection of the external reference signal E_REF will not affect the phase noise performance of the internal reference signal I_REF. The MCU inside the terminal configures the local oscillator frequency output by the PLL in the second frequency tracking component ChipSet2 of the second down-conversion unit 122 via the SPI signal and also adjusts the attenuation to adapt to the OneWeb network.

[0049] Figure 3The figure shows a schematic diagram of the structure of an upconversion module provided in an embodiment of this application. The upconversion module 130 includes an intermediate frequency switch SW4, a third variable attenuator ATT3, a third intermediate frequency amplifier IF_PA3, a fourth intermediate frequency amplifier IF_PA4, a mixer, a sixth bandpass filter BPF6, a first driver amplifier Driver1, a seventh bandpass filter BPF7, a second driver amplifier Driver2, an eighth bandpass filter BPF8, a high power amplifier HPA, a third reference switch SW3, a phase-locked loop PLL, and a third driver amplifier Driver3. The intermediate frequency (IF) switch SW4 also functions as an RF switch. Its two stationary contacts are used to input different IF signals. The moving contact of SW4 connects to the input of the third variable attenuator ATT3. The output of ATT3 connects to the input of the third IF amplifier IF_PA3. The output of IF_PA3 connects to the input of the fourth IF amplifier IF_PA4. The output of IF_PA4 connects to one input of the mixer. The output of the mixer connects to the input of the sixth bandpass filter BPF6. The output of the sixth bandpass filter BPF6 is connected to the input of the first driver amplifier Driver1. The output of the first driver amplifier Driver1 is connected to the input of the seventh bandpass filter BPF7. The output of the seventh bandpass filter BPF7 is connected to the input of the second driver amplifier Driver2. The output of the second driver amplifier Driver2 is connected to the input of the eighth bandpass filter BPF8. The output of the eighth bandpass filter BPF8 is connected to the input of the high-power amplifier HPA. The output of the high-power amplifier HPA serves as the output of the up-conversion module.

[0050] Furthermore, the two stationary contacts of the third reference switch SW3 are used to connect different reference signals. The moving contact of the third reference switch SW3 is connected to the input terminal of the phase-locked loop (PLL), the output terminal of the PLL is connected to the input terminal of the third driver amplifier (Driver3), and the output terminal of the third driver amplifier (Driver3) is connected to the other input terminal of the mixer. It can be understood that the operating network of the upconverter module is the same as the main operating network of the dual-channel downconverter module. Therefore, the reference signal connected to the upconverter module is matched to the corresponding operating network. For example, if the operating network of the upconverter module is the second target network in the LEO communication network, then the reference signal of the corresponding second target network is connected through the third reference switch SW3; if the operating network of the upconverter module is the synchronous rail communication network or the first target network in the LEO communication network, then the corresponding other reference signal is connected through the third reference switch SW3. Similarly, the intermediate frequency signal connected to the upconverter module is also matched to the corresponding working network. If the working network of the upconverter module is the second target network, the intermediate frequency signal of the corresponding second target network is connected through the intermediate frequency switch SW4; if the working network of the upconverter module is the synchronous track communication network or the first target network, the corresponding other intermediate frequency signal is connected through the intermediate frequency switch SW4.

[0051] Furthermore, to adapt to the differences in various satellite communication networks, the upconversion module provides an intermediate frequency (IF) selection network and a reference selection network with configured port matching and filtering functions. These allow the required IF and reference signals to be input through different bandpass filters and RF switches. The IF selection network and the reference selection network share a common input port, forming a first input port and a second input port. For example... Figure 3 As shown, the first input port connects the signal to the intermediate frequency switch SW4 and the third reference switch SW3 via the ninth bandpass filter BPF9 and the eleventh bandpass filter BPF11, respectively. For example, the intermediate frequency signal is connected to the intermediate frequency switch SW4 via the ninth bandpass filter BPF9, and the reference signal is connected to the third reference switch SW3 via the eleventh bandpass filter BPF11. The second input port connects the signal to the intermediate frequency switch SW4 and the third reference switch SW3 via the tenth bandpass filter BPF10 and the twelfth bandpass filter BPF12, respectively. For example, the intermediate frequency signal is connected to the intermediate frequency switch SW4 via the tenth bandpass filter BPF10, and the reference signal is connected to the third reference switch SW3 via the twelfth bandpass filter BPF12.

[0052] Furthermore, both the intermediate frequency switch SW4 and the third reference switch SW3 are controlled by an MCU. For example, when the working network of the upconversion module is the first target network in a low-Earth orbit satellite communication network, the moving contact of the third reference switch SW3 is controlled to connect to the corresponding stationary contact to access the external reference signal adapted to the first target network. The external reference signal passes through a bandpass filter and is then connected to a phase-locked loop (PLL) to lock in the phase and output the local oscillator frequency required by the low-Earth orbit satellite communication network. At the same time, the moving contact of the intermediate frequency switch SW4 is also controlled to connect to the corresponding stationary contact to access the intermediate frequency signal adapted to the first target network, thereby entering the upconversion module.

[0053] For example, geostationary orbit satellite communication networks include traditional GEO networks, while near-Earth orbit satellite communication networks include Starlink and OneWeb networks. The intermediate frequency (IF) of the GEO network is 0.95-1.7 GHz, that of the Starlink network is 0.95-1.45 GHz, and that of the OneWeb network is 4.05-4.175 GHz. Correspondingly, the passband range of the bandpass filter in the IF selection network is adapted to the IF frequencies of the aforementioned networks. Therefore, when the upconversion module operates on the OneWeb network, the OneWeb network carrier is injected into the IF switch through a specific IF matching network and a bandpass filter, and then transmitted to the main link of the upconversion module via the IF switch. The accessed reference signal is a reference signal adapted to the OneWeb network (e.g., a 25 MHz reference signal). Similarly, when the upconverter module operates in a GEO or Starlink network, the third reference switch and the intermediate frequency switch are connected to the stationary contact on the other side. At this time, the reference signal connected to the phase-locked loop is the 10MHz reference signal used in traditional GEO or Starlink networks. The corresponding intermediate frequency matching and bandpass filter network on the other side of the intermediate frequency switch is adapted to the 0.95-1.7GHz range to connect to the intermediate frequency signal of the GEO or Starlink network.

[0054] Figure 4 The figure shows a schematic diagram of the network switching control method provided in an embodiment of this application. The method is applied to the satellite communication transceiver in the above embodiment. The satellite communication transceiver realizes fast switching of satellite communication network by executing the method. It can be understood that the method can be used to control the selection state of the radio frequency switch, the local oscillator frequency of the phase-locked loop and the attenuation of the link on the satellite communication transceiver, so as to adapt to the switched satellite communication network. The specific steps include S110-S160.

[0055] Step S110: When the device is powered on, in response to receiving a query request signal sent by the terminal controller through the LVDS differential pair signal line, a feedback signal is sent to the terminal controller to establish a communication connection.

[0056] Step S120: Based on historical configuration information, initialize the dual-channel downconverter module and upconverter module.

[0057] Step S130: Based on the mode information received from the terminal controller, determine the selected network mode, local oscillator address information, and local oscillator switching enable signal.

[0058] Step S140: Based on the network mode, local oscillator address information, and local oscillator switching enable signal, adjust the local oscillator frequency and attenuation of the dual-channel downconversion module and upconversion module via the SPI bus, and control the selection state of the first reference switch, second reference switch, third reference switch, and intermediate frequency switch to determine the main working network and backup network.

[0059] Step S150: Receive different beams through the dual-channel downconversion module so that the terminal controller can perform satellite lock-in and continuous tracking operations on the main working network and backup network, and complete the network access application and establish communication connection for the main working network and backup network.

[0060] Step S160: In response to receiving the mode information for switching, the local oscillator frequency of the upconversion module is adjusted via the SPI bus, and the selection states of the third reference switch and the intermediate frequency switch are controlled to make the backup network the new main working network.

[0061] Understandably, after the device is powered on, the satellite communication transceiver communicates with the terminal controller to establish a communication connection. The MCU inside the satellite communication transceiver is connected to the terminal controller via LVDS differential pair signal lines. The terminal controller can send a query request signal in LVDS differential level form to the MCU via the LVDS differential pair signal lines through its internal FPGA (Field Programmable Gate Array) or microcontroller via the corresponding serial port. Optionally, the terminal controller can continuously send this signal after power-on or send the signal at preset intervals. After the satellite communication terminal is powered on, upon receiving the query request signal, the satellite communication terminal sends a feedback signal in LVDS differential level form to the terminal controller via LVDS differential pair signal lines, thereby establishing a communication connection with the terminal controller to complete the transmission link confirmation. Figure 5 This is a schematic diagram showing the test results of radiation from a transmission line without special shielding in the relevant technical solution. Figure 6 This is a schematic diagram showing the test results of the radiation from the transmission line in this application without special shielding. Figure 5 and Figure 6The horizontal axis represents the signal frequency, and the vertical axis represents the radiated power. The relevant technical solutions use a SerDes serial port for signal transmission, while this application's solution uses LVDS differential pair signal lines. As can be seen from the comparison, SerDes parallel serial transmission technology, based on precise clock synchronization and modulation, inevitably produces numerous high-order harmonics with the square wave signal during transmission, radiating outwards along the communication path. Therefore, in cases of poor transmission line shielding, this can generate radiated interference ranging from tens of megahertz to gigahertz to surrounding equipment. These radiated frequencies fall precisely within the operating frequency range of satellite communication system equipment, easily affecting the signal-to-noise ratio of the system. The LVDS low-voltage differential transmission technology used in this application's solution can reduce radiated interference and avoid adverse effects on equipment.

[0062] The historical configuration information contains the configuration parameters of all phase-locked loop (PLL) registers in the satellite communication transceiver before the last power-off. After power-on, the MCU initializes the dual-channel downconversion and upconversion modules based on this historical configuration information to configure the PLL registers in the link. After initialization, it receives mode information from the terminal controller. This mode information carries the selected network mode, local oscillator (LO) address information, and LO switching enable signal. This information can be represented by the level signals received by the LVDS differential pair signal lines. The MCU can determine the selected network mode, LO address information, and LO switching enable signal by parsing the level signals. It is conceivable that network modes include those corresponding to geostationary orbit satellite communication networks, such as GEO network mode, and also those corresponding to near-Earth orbit satellite communication networks, such as Starlink network mode and OneWeb network mode. The LO address information is used to find the selected LO frequency, and the LO switching enable signal is used to trigger the MCU to switch the network and LO frequency, enabling the MCU to control the RF switch's selection state during network switching.

[0063] To address this, the MCU adjusts the local oscillator frequency and attenuation of the dual-channel downconversion and upconversion modules via the SPI bus, and controls the selection states of the first, second, and third reference switches and the intermediate frequency switch to determine the primary and backup networks. It is conceivable that the specific parameters of the local oscillator frequency and the selection states of each RF switch are all related to the working network of the corresponding link. Both the dual-channel downconversion and upconversion modules are configured with corresponding network modes. The MCU controls the selection states of each RF switch to connect the corresponding reference signal to the link and controls the local oscillator frequency of the phase-locked loop in each link to match the corresponding network mode via the SPI bus, so that the frequency trace component in the link can access the local oscillator signal of the corresponding frequency during mixing.

[0064] Furthermore, after the dual-channel down-conversion module down-converts different beams, the signals are processed by the modem. The terminal controller in the satellite communication terminal can determine the relative angles, directions, and positions of the satellites in the primary and backup networks to complete satellite locking and continuous tracking operations. Optionally, in one embodiment, in the satellite communication terminal, the dual-channel down-conversion module down-converts different beams to obtain intermediate frequency (IF) signals, which are then processed by a first modem and a second modem to lock onto the primary and backup networks. The satellite communication terminal obtains the radio frequency (RF) signals of the primary and backup networks via the down-conversion link through the satellite transceiver, and then determines the relative angles, directions, and positions of the satellites in the primary and backup networks through the terminal controller. Understandably, after the satellite transceiver completes signal reception via two downlinks, the terminal controller, after locking onto the satellite, needs to establish connections with both the primary and backup networks. The backup network then shuts down its uplink transmission to enter an offline state, but continues to track its signal reception. This avoids the long initial network access wait time. Reconnecting after going offline only requires signaling interaction to restore the network. For the uplink transmission links, the satellite transceiver uses an upconverter module to switch between the backup and primary networks for separate network handshake connections. Furthermore, after the backup network connects to the uplink and then goes offline, it enters an offline state.

[0065] Furthermore, the satellite communication terminal can be pre-configured with primary and backup configuration information. This configuration information is used to pre-configure the downconversion link as the corresponding primary working network. For example, the first downconversion unit can be configured as the downconversion link of the corresponding primary working network. In response, the MCU of the satellite communication transceiver determines the satellite communication network as the primary working network according to the primary and backup configuration information for the first and second downconversion units, and controls the upconversion module to switch to the operating state matching the primary working network. It can be understood that the operating network of the upconversion module is the primary working network. Based on the local oscillator frequency corresponding to the primary working network, the satellite communication terminal adjusts the RF switch, phase-locked loop, and adjustable attenuator in the upconversion module through the MCU in the satellite communication transceiver, thereby switching the upconversion module to the operating state matching the primary working network, ensuring that the satellite communication terminal operates on the primary working network.

[0066] Furthermore, when switching to a backup network, since the relevant parameters of the backup network are already determined, once a switch to the backup network is required, the terminal does not need to reconfigure or search for satellites. It can determine the satellite direction and location information of the backup network and use it as the new primary working network. After configuring the differentiated registers according to the network to be switched (such as reconfiguring the phase-locked loop), the uplink RF link can be established. At the same time, the uplink antenna can obtain the direction, pointing, and location information of the original receiving backup network and send a command to hand over and re-enter the network, thereby effectively reducing the time spent switching networks. For example, in the switching of the uplink link, refer to Figure 7 , Figure 7 This diagram illustrates the time consumption detection results for network switching on an upconversion link according to an embodiment of this application. The diagram corresponds to the scenario of switching from any channel of GEO / Starlink (each channel corresponds to a different local oscillator frequency) to any channel of OneWeb (each channel corresponds to a different local oscillator frequency), with a total switching time of 238µs (i.e., Figure 7 (X2 minus X1). See reference. Figure 8 , Figure 8 This is a schematic diagram illustrating the time consumption detection results for network switching on an upconversion link according to another embodiment of this application. The diagram corresponds to the scenario of switching from any OneWeb channel to any GEO / Starlink channel, with a total switching time of 404µs (i.e., Figure 8 (X2 minus X1).

[0067] During the switching of the downconversion link, refer to Figure 9 , Figure 9 This is a schematic diagram illustrating the time consumption detection results of network switching on a downconversion link according to an embodiment of this application. The diagram corresponds to a total switching time of 313µs when switching from any channel of GEO / Starlink to any channel of OneWeb. Figure 9 (X2 minus X1). See reference. Figure 10 , Figure 10 This is a schematic diagram illustrating the time consumption detection results for network switching of a downconversion link according to another embodiment of this application. The diagram shows the total switching time of 371µs (i.e., when switching from any channel of OneWeb to any channel of GEO / Starlink) in this embodiment. Figure 10 (X2 minus X1).

[0068] As can be seen from the above scheme, the satellite communication terminal of this scheme can achieve rapid switching between satellite communication networks of two different orbits and constellations based on the new monitoring technology of LVDS transmission and combined with the switching control of the link. It meets the switching requirements of low-orbit satellite communication terminals with multiple channel switching needs for up-conversion and down-conversion local oscillator frequencies below 400us, effectively reducing the network switching time. Moreover, it does not require reconfiguration and satellite locking when switching between different satellite networks, which is helpful for applications in the field of emergency response.

[0069] In one embodiment, the LVDS differential pair signal lines have multiple communication channels to transmit LVDS levels. For example, mode information is transmitted through changes in the LVDS levels of six communication channels. Specifically, the local oscillator switching enable signal is transmitted through two channels, one corresponding to the upconversion link and the other to the downconversion link. The signal corresponding to the network mode is transmitted through one channel. For example, a low level indicates the mode corresponding to the geostationary orbit satellite communication network and the mode corresponding to the first target network in the low orbit satellite communication network, and a high level indicates the mode corresponding to the second target network in the low orbit satellite communication network. The signal corresponding to the local oscillator address information is transmitted through three channels. Furthermore, the terminal controller sends the local oscillator switching signal in the corresponding transmission order. For example, the terminal controller first sends the local oscillator switching signal, local oscillator address information, and network mode corresponding to the second downconversion unit, then sends the local oscillator switching signal, local oscillator address information, and network mode corresponding to the first downconversion unit, and finally sends the local oscillator switching signal, local oscillator address information, and network mode corresponding to the upconversion module. The satellite transceiver can determine the corresponding signal by monitoring the level changes of the corresponding pins. Furthermore, based on the local oscillator switching enable signal, the satellite communication terminal can determine the activation order of the dual-channel downconversion module and upconversion module, which are frequency conversion modules, i.e., the switching order is determined according to the order in which the local oscillator switching enable signal is received.

[0070] After receiving information, the satellite communication transceiver determines the satellite communication network and the current local oscillator frequency corresponding to the currently triggered frequency conversion module based on the selected network mode and local oscillator address information. It then configures the local oscillator frequency output by the phase-locked loop in the currently triggered frequency conversion module via the SPI signal. It can be understood that the local oscillator address information transmitted through three channels, combined with the corresponding level state of the network mode, forms a 4-bit binary address. This can be achieved by establishing a lookup table between the address and the local oscillator frequency to record the relationship between the frequency values ​​of different local oscillator frequencies for multiple network modes and the address. Thus, the specific value of the local oscillator frequency for different satellite communication networks can be determined using the 4-bit binary address. After determining the local oscillator frequency, the MCU in the satellite communication terminal adjusts the phase-locked loop via the SPI signal to control the change of the local oscillator frequency.

[0071] Understandably, after confirming that the monitoring transmission chain is functioning normally, the terminal controller transmits mode information to the MCU via the LVDS channel. Specifically, this is achieved through 6 channels of LVDS levels. One bit represents the satellite communication terminal mode; a low level indicates the synchronous orbit communication network and the first target network, while a high level indicates the second target network. Three bits represent the shared address bits for the local oscillator frequency information (e.g., LO1, LO2, LO3), and one bit represents the local oscillator switching enable signal (TX_LO_LE / RX_LO_LE). Furthermore, RX1 represents the first down-conversion unit, RX2 represents the second down-conversion unit, and TX represents the up-conversion module. The relationship between each frequency point in the local oscillator frequency of different networks in each link (e.g., the local oscillator frequency TX_LO Freq for the corresponding transmit link, and the local oscillator frequency RX_LO Freq for the corresponding receive link) and the shared address bits, mode, local oscillator switching enable signal, first control signal, and second control signal is shown in the frequency correspondence table.

[0072] Table 1 Frequency Correspondence Table

[0073] In the table above, "\" indicates that the item is not controlled or does not correspond to any frequency point. As shown in the table, the configuration of the local oscillator frequency for different modes is triggered by the local oscillator switching enable signal, and the specific frequency point can be uniquely determined by the mode and address bits. Furthermore, after the satellite communication transceiver receives the first down-conversion switching enable signal (such as RX_LO_LE mentioned above), it will wait for one remaining down-conversion switching enable signal and one up-conversion switching enable signal (such as TX_LO_LE mentioned above) within 40µs, recording the corresponding address and mode bits at each interrupt. If the number of interrupts is insufficient within a certain time or if address information outside the truth table is obtained, the MCU will send an LVDS instruction via the UART serial port to inform the terminal controller of a packet loss anomaly and request a retransmission.

[0074] Furthermore, when the dual-channel downconversion module is triggered, the satellite communication terminal configures the selection states of the first and second reference switches according to the working network of the second downconversion unit. Specifically, if the second downconversion unit in the dual-channel downconversion module is matched to the second target network in the low-Earth orbit communication network, it outputs a low-level first control signal. This low-level first control signal is used to control the first and second reference switches to cut off the internal reference signal and connect to the external reference signal. In this way, the low-level first control signal connects the moving contact of the first reference switch to the first stationary contact, and the moving contact of the second reference switch to the first stationary contact, thereby connecting the external reference signal to the second downconversion unit through the first and second reference switches. It is conceivable that both the first and second reference switches are controlled by the first control signal; after the low-level first control signal is connected, such as... Figure 2 As shown, the internal reference signal connected to the second stationary contact of the second reference switch is isolated by the second reference switch, thereby enabling the first control signal to turn off the internal reference signal to prevent interference.

[0075] If the second downconverter unit in the dual-channel downconverter module is matched to the first target network in a synchronous orbit communication network or a low-Earth orbit satellite communication network, a high-level first control signal is output. This high-level first control signal controls the first and second reference switches to cut off the external reference signal and connect to the internal reference signal. Specifically, the high-level first control signal connects the moving contact of the first reference switch to the second stationary contact, and the moving contact of the second reference switch to the second stationary contact, thereby connecting the internal reference signal to the second downconverter unit through the second reference switch. Figure 2 As shown, at this time, the first reference switch connects the moving contact and the second stationary contact to connect the load resistor, that is, the external reference signal is connected to the load resistor, thereby turning off the external reference signal from entering the subsequent stage.

[0076] Furthermore, when the upconversion module is triggered, the satellite communication terminal configures the selection states of the third reference switch and the intermediate frequency switch according to the working network of the upconversion module. Specifically, if the upconversion module is matched to the second target network in the low-Earth orbit communication network, it outputs a low-level second control signal. This low-level second control signal is used to control the intermediate frequency switch to connect to the intermediate frequency signal of the corresponding second target network and the third reference switch to connect to the reference signal of the corresponding second target network. If the upconversion module is matched to the first target network in the geostationary orbit communication network or the low-Earth orbit communication network, it outputs a high-level second control signal. This high-level second control signal is used to control the intermediate frequency switch to connect to the intermediate frequency signal of the corresponding geostationary orbit communication network and the third reference switch to connect to the reference signal of the corresponding geostationary orbit communication network, or to control the intermediate frequency switch to connect to the intermediate frequency signal of the corresponding first target network and the third reference switch to connect to the reference signal of the corresponding first target network. (Refer to...) Figure 3 The two stationary contacts of the intermediate frequency switch SW4 are connected to different intermediate frequency signals through corresponding filters. For example, the intermediate frequency signal corresponding to the second target network is connected to the ninth bandpass filter BPF9, and the intermediate frequency signal corresponding to the geostationary orbit communication network or the first target network is connected to the tenth bandpass filter BPF10. When a low-level second control signal is applied to the intermediate frequency switch SW4, the intermediate frequency signal corresponding to the second target network is connected to the intermediate frequency switch SW4 through the ninth bandpass filter BPF9, and then enters the subsequent third variable attenuator ATT3. When a high-level second control signal is applied to the intermediate frequency switch SW4, the intermediate frequency signal corresponding to the geostationary orbit satellite communication network or the first target network is connected to the intermediate frequency switch SW4 through the tenth bandpass filter BPF10, and then enters the subsequent third variable attenuator ATT3.

[0077] The reference signal corresponding to the second target network (e.g., a 25MHz reference signal) is connected to the eleventh bandpass filter BPF11, and the reference signal corresponding to the synchronous track communication network or the first target network (e.g., a 10MHz reference signal) is connected to the twelfth bandpass filter BPF12. A low-level second control signal is connected to the third reference switch SW3, and the reference signal corresponding to the second target network is connected to the third reference switch SW3 through the eleventh bandpass filter BPF11, thus entering the next stage of the phase-locked loop (PLL). If the synchronous track communication network or the first target network uses the same reference signal, when a high-level second control signal is connected to the third reference switch SW3, this reference signal is connected to the third reference switch SW3 through the twelfth bandpass filter BPF12, thus entering the next stage of the PLL.

[0078] To address this, by synchronously controlling the radio frequency switch, this solution can quickly switch to access the corresponding signal, thereby matching the current working network requirements of the module and achieving efficient and accurate satellite communication to ensure stable communication.

[0079] In one embodiment, the satellite communication terminal uses address bit signals to represent the selected network mode and local oscillator address information. For example, the local oscillator address information transmitted through 3 channels, combined with the level state corresponding to the network mode transmitted through a single channel, can form a 4-bit binary address. This address bit signal is used to configure the up-conversion module and the dual-channel down-conversion module; that is, the transmit channel and the two receive links all use 4-bit binary addresses to represent the selected network mode and local oscillator frequency, and these are represented by different address bit signals.

[0080] The satellite communication terminal also stores an attenuation calibration table. This table stores the local oscillator frequency and attenuation configuration value for each link (such as the up-conversion link and down-conversion link mentioned above). The local oscillator frequency and attenuation configuration value are in one-to-one correspondence, and the attenuation configuration value is related to the attenuation of the link; that is, the attenuation in the link is different at different local oscillator frequencies. The satellite communication transceiver uses the address bit signal to look up the attenuation configuration value in the preset attenuation calibration table that matches the configured network mode and local oscillator frequency. In the attenuation calibration table, the local oscillator frequency is associated with the network mode, and there is a one-to-one correspondence between the local oscillator frequency and the attenuation configuration value. Based on the configured local oscillator frequency, the corresponding attenuation configuration value can be determined, and then, based on the attenuation configuration value, the attenuation of the adjustable attenuator of the currently triggered frequency conversion module is controlled. For example, in the transmit link of the up-conversion module, the attenuation configuration value is configured by adjusting the variable attenuator, and its value is related to the DAC analog voltage, so that the attenuation of the link is controlled by the analog voltage corresponding to the attenuation configuration value. It is conceivable that this DAC signal is the voltage signal output after digital-to-analog conversion. The MCU connects to the adjustable attenuator. For example, the MCU connects to the control terminal of the adjustable attenuator via its DAC pin, allowing it to adjust the attenuation by controlling the output DAC signal. This adapts to the signal transmission requirements of both the upconversion and downconversion links, ensuring signal quality. In the receiving link of the dual-channel downconversion module, different attenuation configuration values ​​are achieved by configuring the DSA register in the frequency trace component. The MCU then configures the corresponding DSA register of the frequency trace component via the SPI bus to control the attenuation of the link.

[0081] Figure 11 The figure shows a schematic diagram of a network switching control device provided in an embodiment of this application. The device is used to execute the network switching control method provided in the above embodiment and possesses the functional modules and beneficial effects required to execute the method. As shown, the network switching control device includes a connection establishment module 301, an initialization module 302, a signal parsing module 303, a parameter configuration module 304, a signal receiving module 305, and a network switching module 306.

[0082] The connection establishment module 301 is configured to send a feedback signal to the terminal controller to establish a communication connection when the device is powered on, in response to receiving a query request signal sent by the terminal controller through the LVDS differential pair signal line. The initialization module 302 is configured to initialize the dual-channel downconversion module and upconversion module based on historical configuration information. The historical configuration information is the configuration parameters of all phase-locked loop registers in the satellite communication transceiver before the last power-off. The signal parsing module 303 is configured to determine the selected network mode, local oscillator address information, and local oscillator switching enable signal based on the mode information received from the terminal controller. The parameter configuration module 304 is configured to adjust the local oscillator frequency and attenuation of the dual-channel downconverter module and upconverter module via the SPI bus according to the network mode, local oscillator address information and local oscillator switching enable signal, and control the selection state of the first reference switch, second reference switch, third reference switch and intermediate frequency switch to determine the main working network and backup network. The signal receiving module 305 is configured to receive different beams through a dual-channel down-conversion module, so that the terminal controller can perform satellite locking and continuous tracking operations on the main working network and the backup network, and complete the network access application and establish communication connection for the main working network and the backup network. The network switching module 306 is configured to, in response to receiving mode information for switching, adjust the local oscillator frequency of the up-conversion module via the SPI bus and control the gating state of the third reference switch and the intermediate frequency switch, so as to use the backup network as the new main working network.

[0083] Based on the above embodiments, the parameter configuration module 304 is specifically configured as follows: Based on the local oscillator switching enable signal, the turn-on sequence of the dual-channel downconverter module and upconverter module, which are frequency conversion modules, is determined. Based on the selected network mode and local oscillator address information, the satellite communication network and the current local oscillator frequency corresponding to the currently triggered frequency conversion module are determined, and the phase-locked loop in the currently triggered frequency conversion module is configured through the SPI signal. When the dual-channel downconversion module is triggered, if the second downconversion unit in the dual-channel downconversion module is matched with the second target network in the low-orbit communication network, a first control signal at a low level is output. The first control signal at a low level is used to control the first reference switch and the second reference switch to cut off the internal reference signal and connect to the external reference signal. When the dual-channel downconverter module is triggered, if the second downconverter unit in the dual-channel downconverter module is matched with the first target network in the synchronous rail communication network or the low rail communication network, a first control signal at a high level is output. The first control signal at a high level is used to control the first reference switch and the second reference switch to cut off the external reference signal and connect the internal reference signal. When the upconversion module is triggered, if the upconversion module is matched with the second target network in the low-orbit communication network, a second control signal at a low level is output. The second control signal at a low level is used to control the intermediate frequency switch to connect to the intermediate frequency signal of the corresponding second target network and the third reference switch to connect to the reference signal of the corresponding second target network. When the upconversion module is triggered, if the upconversion module is matched with the first target network in the synchronous track communication network or the low-speed track communication network, a second control signal at a high level is output. The second control signal at a high level is used to control the intermediate frequency switch to connect to the intermediate frequency signal of the corresponding synchronous track communication network and the third reference switch to connect to the reference signal of the corresponding synchronous track communication network, or to control the intermediate frequency switch to connect to the intermediate frequency signal of the corresponding first target network and the third reference switch to connect to the reference signal of the corresponding first target network.

[0084] Based on the above embodiments, the selected network mode and local oscillator address information are address bit signals. These address bit signals are represented by the level states of multiple channels in the LVDS differential pair signal lines. The address bit signals are used to configure the up-conversion module and the dual-channel down-conversion module. The device also includes an attenuation configuration module, which is configured as follows: Based on the address bit signal, find the attenuation configuration value that matches the configured network mode and local oscillator frequency in the preset attenuation calibration table; Based on the attenuation configuration value, control the attenuation amount of the adjustable attenuator of the currently triggered frequency converter module.

[0085] Based on the above embodiments, the signal receiving module 305 is specifically configured as follows: The intermediate frequency (IF) signal is obtained by downconverting different beams through a dual-channel downconversion module, and then the corresponding IF signal is processed by the first modem and the second modem to lock the main working network and the backup network. Based on the primary and backup configuration information of the first and second downconversion units, the satellite communication network to be used as the primary working network is determined, and the upconversion module is controlled to switch to the working state that matches the primary working network.

[0086] It is worth noting that in the above embodiments, the functional modules are divided according to functional logic, but are not limited to the above division, as long as the corresponding functions can be achieved; in addition, the specific names of each functional module are only for easy differentiation and are not used to limit the scope of protection of this application.

[0087] For example, the satellite communication terminal provided in this application is used to execute the network handover control method provided in the above embodiments, and has the corresponding functional modules and beneficial effects of executing the method. The device includes a processor, a memory, an input device, and an output device. The number of processors can be one or more, and the processor, memory, input device, and output device can be connected via a bus or other means. The memory, as a computer-readable storage medium, can be used to store software programs, computer-executable programs, and modules, such as the program instructions / modules corresponding to the network handover control method in the embodiments of this application. The processor executes various corresponding functional applications and data processing by running the software programs, instructions, and modules stored in the memory, thereby implementing the above-described network handover control method.

[0088] The memory may primarily include a program storage area and a data storage area. The program storage area may store the operating system and at least one application program required for a given function; the data storage area may store data recorded or created during use. Furthermore, the memory may include high-speed random access memory and non-volatile memory, such as at least one disk storage device, flash memory, or other non-volatile solid-state storage device. In some embodiments, the memory may further include memory remotely located relative to the processor, which can be connected to a server via a network. Examples of such networks include, but are not limited to, the Internet, intranets, local area networks, mobile communication networks, and combinations thereof.

[0089] The input device can be used to input corresponding digital or character information to the processor, and to generate key signal inputs related to the user settings and function control of the device; the output device can be used to send or display key signal outputs related to the user settings and function control of the device.

[0090] This application also provides a storage medium storing computer-executable instructions, which, when executed by a processor, are used to perform related operations in the network switching control method provided in any embodiment of this application.

[0091] Computer-readable storage media include both permanent and non-permanent, removable and non-removable media, and information storage can be achieved by any method or technology. Information can be computer-readable instructions, data structures, program modules, or other data. Examples of computer storage media include, but are not limited to, phase-change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other memory technologies, CD-ROM, digital versatile optical disc (DVD) or other optical storage, magnetic tape, disk storage or other magnetic storage devices, or any other non-transfer medium that can be used to store information accessible by a computing device.

[0092] It should also be noted that the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus. Unless otherwise specified, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element.

[0093] Note that the above are merely preferred embodiments and the technical principles employed in this application. Those skilled in the art will understand that this application is not limited to the specific embodiments described herein, and various obvious changes, readjustments, and substitutions can be made without departing from the scope of protection of this application. Therefore, although this application has been described in detail through the above embodiments, this application is not limited to the above embodiments, and may include many other equivalent embodiments without departing from the concept of this application, the scope of which is determined by the scope of the appended claims.

Claims

1. A satellite communication transceiver, connected to a phased array antenna, wherein the phased array antenna is used to receive two beams pointing in different directions and output the two beams to the satellite communication transceiver through different output channels, and to transmit uplink signals, characterized in that, The satellite communication transceiver includes: The MCU is connected to an external terminal controller via LVDS differential pair signal lines to establish a multi-channel parallel port communication connection with the terminal controller. A dual-channel down-conversion module includes a first down-conversion unit and a second down-conversion unit. The input terminals of the first and second down-conversion units are respectively connected to an output channel of the phased array antenna to access different beams. The receiving frequency range of the first down-conversion unit includes a first frequency range corresponding to the geostationary orbit communication network and a second frequency range corresponding to a first target network in the low-Earth orbit communication network. The receiving frequency range of the second down-conversion unit includes the first frequency range corresponding to the geostationary orbit communication network, the second frequency range corresponding to the first target network in the low-Earth orbit communication network, and the second frequency range corresponding to the low-Earth orbit communication network. The third frequency range of the second target network in the communication network, the reference access terminal of the first downconversion unit is used to access the internal reference signal, the reference access terminal of the second downconversion unit is provided with a first reference switch and a second reference switch, the moving contact of the first reference switch is used to access the external reference signal, the first stationary contact of the first reference switch is connected to the first stationary contact of the second reference switch, the second stationary contact of the first reference switch is connected to the grounded load resistor, the second stationary contact of the second reference switch is used to access the internal reference signal, and the control terminals of the first reference switch and the second reference switch are both connected to the first control pin of the MCU; The upconversion module has an intermediate frequency switch at its first input terminal for selecting an intermediate frequency signal and a third reference switch at its second input terminal for selecting a reference signal. The control terminals of the intermediate frequency switch and the third reference switch are both connected to the second control pin of the MCU. The two stationary contacts of the intermediate frequency switch are used to connect to the intermediate frequency signal of the corresponding second target network and the intermediate frequency signal of the corresponding synchronous track communication network or the first target network, respectively. The two stationary contacts of the third reference switch are used to connect to the reference signal of the corresponding second target network and the reference signal of the corresponding synchronous track communication network or the first target network, respectively.

2. The satellite communication transceiver according to claim 1, characterized in that, The first downconversion unit includes a first low-noise amplifier, a first bandpass filter, a first frequency tracer component, a first low-pass filter, a first variable attenuator, a first intermediate frequency amplifier, a first high-pass filter, and a second bandpass filter; The input terminal of the first low-noise amplifier serves as the input terminal of the first down-conversion unit. The output terminal of the first low-noise amplifier is connected to the input terminal of the first band-pass filter. The output terminal of the first band-pass filter is connected to the RF input terminal of the first frequency tracer component. The intermediate frequency output terminal of the first frequency tracer component is connected to the input terminal of the first low-pass filter. The output terminal of the first low-pass filter is connected to the input terminal of the first variable attenuator. The output terminal of the first variable attenuator is connected to the input terminal of the first intermediate frequency amplifier. The output terminal of the first intermediate frequency amplifier is connected to the input terminal of the first high-pass filter. The output terminal of the first high-pass filter serves as the output terminal of the first down-conversion unit. The input terminal of the second band-pass filter is used to input the internal reference signal. The output terminal of the second band-pass filter is connected to the reference input terminal of the first frequency synthesizer component.

3. The satellite communication transceiver according to claim 1 or 2, characterized in that, The second downconversion unit includes a second low-noise amplifier, a third bandpass filter, a second frequency tracer, a second low-pass filter, a first switching switch, a second switching switch, a fourth bandpass filter, a third low-pass filter, a second variable attenuator, a second intermediate frequency amplifier, a first reference switch, a second reference switch, and a fifth bandpass filter; The input terminal of the second low-noise amplifier serves as the input terminal of the second down-conversion unit. The output terminal of the second low-noise amplifier is connected to the input terminal of the third bandpass filter. The output terminal of the third bandpass filter is connected to the RF input terminal of the second frequency tracer component. The IF output terminal of the second frequency tracer component is connected to the input terminal of the second low-pass filter. The output terminal of the second low-pass filter is connected to the moving contact of the first switching switch. The first stationary contact of the first switching switch is connected to the input terminal of the fourth bandpass filter. The second stationary contact of the first switching switch is connected to the input terminal of the third low-pass filter. The first stationary contact of the second switching switch is connected to the input terminal of the fourth bandpass filter. The output terminals of the four bandpass filters are connected as follows: the second stationary contact of the second switching switch is connected to the output terminal of the third low-pass filter; the moving contact of the second switching switch is connected to the input terminal of the second variable attenuator; the control terminals of the first and second switching switches are both connected to the first control pin of the MCU; the output terminal of the second variable attenuator is connected to the input terminal of the second intermediate frequency amplifier; the output terminal of the second intermediate frequency amplifier serves as the output terminal of the second down-conversion unit; the input terminal of the fifth bandpass filter is connected to the moving contact of the second reference switch; and the output terminal of the fifth bandpass filter is connected to the reference input terminal of the second frequency tracer.

4. The satellite communication transceiver according to claim 1, characterized in that, The upconversion module includes the intermediate frequency switch, the third variable attenuator, the third intermediate frequency amplifier, the fourth intermediate frequency amplifier, the mixer, the sixth bandpass filter, the first driver amplifier, the seventh bandpass filter, the second driver amplifier, the eighth bandpass filter, the high-power amplifier, the third reference switch, the phase-locked loop, and the third driver amplifier; The moving contact of the intermediate frequency switch is connected to the input terminal of the third variable attenuator. The output terminal of the third variable attenuator is connected to the input terminal of the third intermediate frequency amplifier. The output terminal of the third intermediate frequency amplifier is connected to the input terminal of the fourth intermediate frequency amplifier. The output terminal of the fourth intermediate frequency amplifier is connected to one input terminal of the mixer. The output terminal of the mixer is connected to the input terminal of the sixth bandpass filter. The output terminal of the sixth bandpass filter is connected to the input terminal of the first driver amplifier. The output terminal of the first driver amplifier is connected to the input terminal of the seventh bandpass filter. The output terminal of the seventh bandpass filter is connected to the input terminal of the second driver amplifier. The output terminal of the second driver amplifier is connected to the input terminal of the eighth bandpass filter. The output terminal of the eighth bandpass filter is connected to the input terminal of the high-power amplifier. The output terminal of the high-power amplifier serves as the output terminal of the upconversion module. The moving contact of the third reference switch is connected to the input terminal of the phase-locked loop (PLL). The output terminal of the PLL is connected to the input terminal of the third driver amplifier. The output terminal of the third driver amplifier is connected to the other input terminal of the mixer.

5. A network handover control method, characterized in that, The method, applied to the satellite communication transceiver of any one of claims 1-4, comprises: When the device is powered on, in response to receiving a query request signal sent by the terminal controller via the LVDS differential pair signal line, a feedback signal is sent to the terminal controller to establish a communication connection; Based on historical configuration information, the dual-channel downconversion module and upconversion module are initialized and configured. The historical configuration information is the configuration parameters of all phase-locked loop registers in the satellite communication transceiver before the last power-off. Based on the mode information received from the terminal controller, the selected network mode, local oscillator address information, and local oscillator switching enable signal are determined. Based on the network mode, the local oscillator address information, and the local oscillator switching enable signal, the local oscillator frequency and attenuation of the dual-channel downconversion module and the upconversion module are adjusted via the SPI bus, and the selection states of the first reference switch, the second reference switch, the third reference switch, and the intermediate frequency switch are controlled to determine the main working network and the backup network. The dual-channel downconversion module receives different beams so that the terminal controller can perform satellite locking and continuous tracking operations on the main working network and the backup network, and complete the network access application and establish communication connection for the main working network and the backup network. In response to receiving mode information for switching, the local oscillator frequency of the upconversion module is adjusted via the SPI bus, and the selection states of the third reference switch and the intermediate frequency switch are controlled to make the backup network the new main working network.

6. The network handover control method according to claim 5, characterized in that, The step of adjusting the local oscillator frequencies of the dual-channel downconverter module and the upconverter module via the SPI bus according to the network mode, the local oscillator address information, and the local oscillator switching enable signal, and controlling the selection states of the first reference switch, the second reference switch, the third reference switch, and the intermediate frequency switch to determine the main working network and the backup network includes: Based on the local oscillator switching enable signal, the turn-on sequence of the dual-channel down-conversion module and the up-conversion module, which are frequency conversion modules, is determined. Based on the selected network mode and the local oscillator address information, the satellite communication network corresponding to the currently triggered frequency conversion module and the current local oscillator frequency are determined, and the phase-locked loop in the currently triggered frequency conversion module is configured through the SPI signal. When the dual-channel downconversion module is triggered, if the second downconversion unit in the dual-channel downconversion module is matched with the second target network in the low-orbit communication network, a first control signal at a low level is output. The first control signal at a low level is used to control the first reference switch and the second reference switch to cut off the internal reference signal and connect to the external reference signal. When the dual-channel downconversion module is triggered, if the second downconversion unit in the dual-channel downconversion module is matched with the first target network in the synchronous rail communication network or the low-orbit communication network, a first control signal at a high level is output. The first control signal at a high level is used to control the first reference switch and the second reference switch to cut off the external reference signal and connect the internal reference signal. When the upconversion module is triggered, if the upconversion module is matched with the second target network in the low-orbit communication network, a second control signal at a low level is output. The second control signal at a low level is used to control the intermediate frequency switch to connect to the intermediate frequency signal of the corresponding second target network and the third reference switch to connect to the reference signal of the corresponding second target network. When the upconversion module is triggered, if the upconversion module is matched with a first target network in the synchronous track communication network or the low-speed track communication network, a second control signal at a high level is output. The second control signal at a high level is used to control the intermediate frequency switch to connect to the intermediate frequency signal of the corresponding synchronous track communication network and the third reference switch to connect to the reference signal of the corresponding synchronous track communication network, or to control the intermediate frequency switch to connect to the intermediate frequency signal of the corresponding first target network and the third reference switch to connect to the reference signal of the corresponding first target network.

7. The network handover control method according to claim 6, characterized in that, The selected network mode and the local oscillator address information are address bit signals. The address bit signals are represented by the level states of multiple channels in the LVDS differential pair signal line. The address bit signals are used to configure the upconversion module and the dual-channel downconversion module. After configuring the local oscillator frequency output by the phase-locked loop in the currently triggered frequency conversion module via the SPI signal, the method further includes: Based on the address bit signal, find the attenuation configuration value that matches the configured network mode and local oscillator frequency in the preset attenuation calibration table; Based on the attenuation configuration value, the attenuation amount of the adjustable attenuator of the currently triggered frequency converter module is controlled.

8. The network handover control method according to claim 5, characterized in that, The process of receiving different beams through the dual-channel down-conversion module to complete the satellite lock-in and continuous tracking operation of the main working network and the backup network includes: The dual-channel downconversion module performs downconversion processing on different beams to obtain intermediate frequency signals, which are then processed by the first modem and the second modem to lock the main working network and the backup network. Based on the primary and backup configuration information of the first and second downconversion units, the satellite communication network to be used as the primary working network is determined, and the upconversion module is controlled to switch to a working state that matches the primary working network.

9. A network switching control device, characterized in that, The device is applied to the satellite communication transceiver according to any one of claims 1-4, the device comprising: The connection establishment module is configured to, when the device is powered on, send a feedback signal to the terminal controller to establish a communication connection in response to receiving a query request signal sent by the terminal controller through the LVDS differential pair signal line; The initialization module is configured to initialize the dual-channel downconversion module and upconversion module based on historical configuration information, wherein the historical configuration information is the configuration parameters of all phase-locked loop registers in the satellite communication transceiver before the last power-off. The signal parsing module is configured to determine the selected network mode, local oscillator address information, and local oscillator switching enable signal based on the mode information received from the terminal controller. The parameter configuration module is configured to adjust the local oscillator frequency and attenuation of the dual-channel downconversion module and the upconversion module via the SPI bus according to the network mode, the local oscillator address information and the local oscillator switching enable signal, and control the selection state of the first reference switch, the second reference switch, the third reference switch and the intermediate frequency switch to determine the main working network and the backup network. The signal receiving module is configured to receive different beams through the dual-channel down-conversion module, so that the terminal controller can perform satellite locking and continuous tracking operations on the main working network and the backup network, and complete the network access application and establish communication connection for the main working network and the backup network. The network switching module is configured to, in response to receiving mode information for switching, adjust the local oscillator frequency of the up-conversion module via the SPI bus and control the selection state of the third reference switch and the intermediate frequency switch, so as to use the backup network as the new main working network.

10. A storage medium for storing computer-executable instructions, characterized in that, The computer-executable instructions, when executed by a processor, are used to perform the network switching control method as described in any one of claims 5-8.

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