Vehicle-mounted satellite communication terminal and system

Abstract

The invention discloses a vehicle-mounted satellite communication terminal and system. The terminal comprises a communication module, a communication mode change-over switch connected with the communication module, an active antenna module and a passive antenna module, the active antenna module and the passive antenna module are respectively connected with the communication mode change-over switch, the communication mode change-over switch is used for responding to a first switching operation and controlling the vehicle-mounted satellite communication terminal to enter a handheld terminal communication mode, in the handheld terminal communication mode, the communication module is used for communicating with a satellite through a passive antenna in the passive antenna module; the communication mode change-over switch is further used for responding to the second switching operation and controlling the vehicle-mounted satellite communication terminal to enter a vehicle-mounted terminal communication mode, and in the vehicle-mounted terminal communication mode, the communication module is used for communicating with a satellite through an active antenna in the active antenna module. The technical problem that a related satellite communication terminal cannot meet the requirements of high-quality communication and long-time endurance of the terminal in a vehicle-mounted scene at the same time is solved.

Description

Technical Field

[0001] The present application relates to the field of satellite communication technology, and in particular to a vehicle-mounted satellite communication terminal and system. Background Art

[0002] The vehicle-mounted satellite terminal will provide emergency communication services, such as voice communication and key data reporting, for remote areas such as forests and deserts that are not covered by cellular networks, or for special application scenarios such as transportation. It is a "communication airbag" for vehicle-mounted application scenarios. The satellite vehicle-mounted terminal is mainly composed of a baseband processing unit, a radio frequency unit and an antenna. When sending information, the baseband processing unit is responsible for channel coding, interleaving scrambling, baseband modulation and other processing. The radio frequency unit is responsible for moving the baseband signal spectrum to the radio frequency and amplifying the power. Then the antenna radiates the signal. When receiving the signal, the antenna senses the changing electromagnetic field in the air interface and forms a periodically changing weak current in the antenna loop. Then the radio frequency unit performs low-noise amplification on the signal and moves the radio frequency signal spectrum to the baseband spectrum. Finally, the baseband unit obtains the sent information through operations such as demodulation, deinterleaving, interference removal and decoding. Usually, the baseband unit and the radio frequency unit are packaged into a communication module, and then connected to the antenna through a feeder. When designing the system, the transmission link budget and the receiving link budget must be fully considered to ensure that the signal can be sent and received normally. The link budget is mainly determined by the module, feeder, and antenna. The module gain is constrained by power, and the terminal antenna is placed in the mirror or roof, etc., and the feeder loss is large. Therefore, in the vehicle communication scenario, how to design a suitable antenna solution is crucial. For the vehicle-mounted satellite communication terminal, the communication module gain is limited and the feeder loss is large. It is necessary to design a suitable antenna solution to meet the requirements of the transmission or receiving link budget. The most common technical methods are handheld satellite terminals and vehicle-mounted terminals using active antennas. Handheld satellite terminals usually use passive antennas with high waveform fidelity, low loss, and reliable operation. The advantage is that they can be used portable, but the signal of the handheld satellite terminal is unstable in the car, and it is necessary to go outside the car to have a better signal, so it is difficult to meet the application of vehicle-mounted scenarios. At present, the antenna of the vehicle-mounted satellite navigation terminal is placed in the mirror or roof. The feeder loss between the antenna and the communication module will increase the difficulty of signal recovery. Active antenna solutions are often used, but active antenna solutions consume a lot of energy and reduce battery life. Therefore, the existing solutions cannot meet the requirements of high-quality communication and long battery life of the terminal in vehicle scenarios.

[0003] To address the above-mentioned problems, no effective solution has been proposed yet. Summary of the invention

[0004] The embodiments of the present application provide a vehicle-mounted satellite communication terminal and system to at least solve the technical problem that related satellite communication terminals cannot simultaneously meet the requirements of high-quality communication and long-term battery life for the terminal in a vehicle-mounted scenario.

[0005] According to one aspect of an embodiment of the present application, a vehicle-mounted satellite communication terminal is provided, comprising: a communication module, a communication mode switching switch connected to the communication module, an active antenna module and a passive antenna module respectively connected to the communication mode switching switch, wherein the communication mode switching switch is used to respond to a first switching operation to control the vehicle-mounted satellite communication terminal to enter a handheld terminal communication mode, wherein in the handheld terminal communication mode, the communication module is used to communicate with the satellite through a passive antenna in the passive antenna module; the communication mode switching switch is also used to respond to a second switching operation to control the vehicle-mounted satellite communication terminal to enter a vehicle-mounted terminal communication mode, wherein in the vehicle-mounted terminal communication mode, the communication module is used to communicate with the satellite through an active antenna in the active antenna module.

[0006] Optionally, the communication module includes: a baseband processing unit and a radio frequency unit that are interconnected, wherein, in a signal sending mode, the baseband processing unit is used to encode, multiplex and modulate the data to be sent to obtain a first baseband signal, and the radio frequency unit is used to convert the first baseband signal into a first radio frequency signal, and send the first radio frequency signal to the satellite through an active antenna module or a passive antenna module; in a signal receiving mode, the radio frequency unit is used to convert a second radio frequency signal from the satellite received by the active antenna module or the passive antenna module into a second baseband signal, and the baseband processing unit is used to demodulate, deinterleave and decode the second baseband signal to obtain data to be received.

[0007] Optionally, the RF unit includes: a RF transceiver, a first transmitting component connected to the transmitting end of the RF transceiver, and a first receiving component connected to the receiving end of the RF transceiver; the communication mode switching switch includes: a transmitting switching switch and a receiving switching switch; the passive antenna module includes: a passive antenna; the active antenna module includes: an active antenna, a second transmitting component and a second receiving component respectively connected to the active antenna; the transmitting switching switch is used to respond to a first switching operation to connect the first transmitting component and the passive antenna, and respond to a second switching operation to connect the first transmitting component and the second transmitting component; the receiving switching switch is used to respond to the first switching operation to connect the first receiving component and the passive antenna, and respond to the second switching operation to connect the first receiving component and the second receiving component.

[0008] Optionally, the first transmitting component includes: a first balun, a first surface acoustic wave filter and a first power amplifier connected in sequence, wherein the first balun is connected to the transmitting end of the RF transceiver, and the first power amplifier is connected to the transmitting switching switch; the first receiving component includes: a second balun, a second surface acoustic wave filter and a first low-noise amplifier connected in sequence, wherein the second balun is connected to the receiving end of the RF transceiver, and the first low-noise amplifier is connected to the receiving switching switch.

[0009] Optionally, the active antenna module also includes: a time division duplexer; the second transmitting component includes: a first temperature compensated attenuator, a third surface acoustic wave filter, a first resistance attenuator and a second power amplifier connected in sequence; the second receiving component includes: a second temperature compensated attenuator, a second resistance attenuator, a fourth surface acoustic wave filter, a second low noise amplifier, a fifth surface acoustic wave filter and a third low noise amplifier connected in sequence; wherein the first temperature compensated attenuator is connected to the transmitting switching switch, the second temperature compensated attenuator is connected to the receiving switching switch, the second power amplifier and the third low noise amplifier are both connected to the time division duplexer, and the time division duplexer is connected to the active antenna.

[0010] Optionally, the communication mode switching switch also includes: a first RF connector, a second RF connector, a third RF connector and a fourth RF connector; the second transmitting component also includes: a fifth RF connector; the second receiving component also includes: a sixth RF connector; wherein the first RF connector is respectively connected to the transmitting switching switch and the passive antenna, the second RF connector is respectively connected to the transmitting switching switch and the fifth RF connector, the third RF connector is respectively connected to the receiving switching switch and the passive antenna, the fourth RF connector is respectively connected to the receiving switching switch and the sixth RF connector, the fifth RF connector is also connected to the first temperature compensated attenuator, and the sixth RF connector is also connected to the second temperature compensated attenuator.

[0011] Optionally, a first binary control switch is also connected between the transmit switching switch and the second RF connector, and a second binary control switch is also connected between the fifth RF connector and the first temperature-compensated attenuator; the communication module also includes: a microcontroller unit, and a protocol conversion unit respectively connected to the microcontroller unit, the first binary control switch and the second binary control switch; wherein the microcontroller unit is used to control the first binary control switch and the second binary control switch to be turned on through the protocol conversion unit when there is data to be sent in the communication module, and to control the first binary control switch and the second binary control switch to be turned off through the protocol conversion unit when there is no data to be sent in the communication module.

[0012] Optionally, both the passive antenna and the active antenna include: a satellite communication unit for communicating with a satellite and a navigation positioning unit for satellite positioning.

[0013] Optionally, the communication module, the communication mode switching switch and the passive antenna module are all integrated into the access point carrier board; the second RF connector is connected to the fifth RF connector via an RF cable, the fourth RF connector is connected to the sixth RF connector via an RF cable, and the time division duplexer is connected to the active antenna via an RF cable.

[0014] According to another aspect of an embodiment of the present application, there is also provided a vehicle-mounted satellite communication system, comprising: any one of the vehicle-mounted satellite communication terminals.

[0015] In an embodiment of the present application, a vehicle-mounted satellite communication terminal is provided, comprising: a communication module, a communication mode switching switch connected to the communication module, an active antenna module and a passive antenna module respectively connected to the communication mode switching switch, wherein the communication mode switching switch is used to respond to a first switching operation to control the vehicle-mounted satellite communication terminal to enter a handheld terminal communication mode, wherein in the handheld terminal communication mode, the communication module is used to communicate with the satellite through a passive antenna in the passive antenna module; the communication mode switching switch is also used to respond to a second switching operation to control the vehicle-mounted satellite communication terminal to enter a vehicle-mounted terminal communication mode, wherein in the vehicle-mounted terminal communication mode, the communication module is used to communicate with the satellite through an active antenna in the active antenna module. Through the terminal of the embodiment of the present application, the most suitable communication mode, i.e., passive antenna mode or active antenna mode, can be intelligently selected according to the use environment (handheld or vehicle-mounted) and power supply conditions. In the vehicle-mounted terminal communication mode, the signal attenuation is compensated by the active antenna module, which reduces the additional demand for terminal battery energy, thereby extending the communication time in the vehicle environment. In the handheld terminal communication mode, the use of a passive antenna module with lower power consumption can further save power and extend the standby time of the terminal, thereby ensuring that high-quality communication services can be maintained regardless of how the environmental signal conditions change, thereby solving the technical problem that the relevant satellite communication terminals cannot simultaneously meet the requirements of high-quality communication and long-term battery life for the terminal in the vehicle-mounted scenario. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0017] Figure 1 is a schematic structural diagram of an optional vehicle-mounted satellite communication terminal according to an embodiment of the present application;

[0018] Figure 2 is a schematic structural diagram of an optional communication module according to an embodiment of the present application;

[0019] Figure 3 is a schematic structural diagram of an optional active antenna module according to an embodiment of the present application;

[0020] Figure 4 It is a schematic structural diagram of an optional vehicle-mounted satellite communication system according to an embodiment of the present application. DETAILED DESCRIPTION

[0021] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present application.

[0022] It should be noted that the terms "first", "second", etc. in the specification, claims and drawings of the present application are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device comprising a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0023] Example 1

[0024] According to an embodiment of the present application, a vehicle-mounted satellite communication terminal is provided, such as Figure 1 As shown, the terminal at least includes: a communication module 11, a communication mode switching switch 12 connected to the communication module, an active antenna module 13 and a passive antenna module 14 respectively connected to the communication mode switching switch, wherein:

[0025] The communication mode switching switch 12 is used to respond to the first switching operation and control the vehicle-mounted satellite communication terminal to enter the handheld terminal communication mode, wherein in the handheld terminal communication mode, the communication module 11 is used to communicate with the satellite through the passive antenna in the passive antenna module 14;

[0026] The communication mode switching switch 12 is also used to respond to the second switching operation to control the vehicle-mounted satellite communication terminal to enter the vehicle-mounted terminal communication mode, wherein in the vehicle-mounted terminal communication mode, the communication module 11 is used to communicate with the satellite through the active antenna in the active antenna module 13.

[0027] The functions of each module of the vehicle-mounted satellite communication terminal are explained below in conjunction with the specific implementation process.

[0028] Optionally, the communication module includes: a baseband processing unit and a radio frequency unit that are interconnected, wherein, in a signal sending mode, the baseband processing unit is used to encode, multiplex and modulate the data to be sent to obtain a first baseband signal, and the radio frequency unit is used to convert the first baseband signal into a first radio frequency signal, and send the first radio frequency signal to the satellite through an active antenna module or a passive antenna module; in a signal receiving mode, the radio frequency unit is used to convert a second radio frequency signal from the satellite received by the active antenna module or the passive antenna module into a second baseband signal, and the baseband processing unit is used to demodulate, deinterleave and decode the second baseband signal to obtain data to be received.

[0029] Among them, in the signal transmission mode, the baseband processing unit receives the data to be transmitted, encodes, multiplexes and modulates it, and generates a first baseband signal. Subsequently, the radio frequency unit converts the first baseband signal into a first radio frequency signal, and sends the signal to the satellite through an active antenna module or a passive antenna module. The active antenna module is used when the signal strength needs to be enhanced and the power supply is sufficient, while the passive antenna module is used when the power management is more stringent or the terminal is in handheld mode to reduce power consumption.

[0030] In the signal receiving mode, the RF unit is responsible for receiving the second RF signal from the satellite, which is transmitted through the active antenna module or the passive antenna module. The RF unit converts the second RF signal into a second baseband signal, and then the baseband processing unit demodulates, deinterleaves and decodes the second baseband signal to finally obtain the data to be received. The active antenna module reduces signal attenuation and improves the clarity of the received signal through a built-in low-noise amplifier, while the passive antenna module is used when the signal strength is sufficient to reduce system complexity and cost.

[0031] As an optional implementation, the radio frequency unit includes: a radio frequency transceiver, a first transmitting component connected to a transmitting end of the radio frequency transceiver, and a first receiving component connected to a receiving end of the radio frequency transceiver.

[0032] Optionally, the communication mode switching switch includes: a transmitting switching switch and a receiving switching switch; the passive antenna module includes: a passive antenna; the active antenna module includes: an active antenna, a second transmitting component and a second receiving component respectively connected to the active antenna; the transmitting switching switch is used to respond to a first switching operation, connect the first transmitting component and the passive antenna, and is also used to respond to a second switching operation, connect the first transmitting component and the second transmitting component; the receiving switching switch is used to respond to the first switching operation, connect the first receiving component and the passive antenna, and respond to the second switching operation, connect the first receiving component and the second receiving component.

[0033] The RF switch is used to switch between the handheld passive antenna terminal mode and the vehicle-mounted active antenna terminal mode. In the handheld mode, the terminal may use a passive antenna to save power; while in the vehicle-mounted mode, the RF switch switches the signal path to the active antenna transceiver component to overcome feeder line losses and ensure signal quality and communication efficiency during long-distance communications. The switching of the RF switch realizes the terminal's adaptive function in different scenarios.

[0034] Optionally, the first transmitting component includes: a first balun, a first surface acoustic wave filter and a first power amplifier connected in sequence, wherein the first balun is connected to the transmitting end of the RF transceiver, and the first power amplifier is connected to the transmitting switching switch; the first receiving component includes: a second balun, a second surface acoustic wave filter and a first low noise amplifier connected in sequence, wherein the second balun is connected to the receiving end of the RF transceiver, and the first low noise amplifier is connected to the receiving switching switch. The structural diagram of the communication module is as shown in Figure 2 shown.

[0035] like Figure 2 As shown, the communication module includes: a baseband processing unit 21 and a radio frequency unit 22 that are interconnected. The radio frequency unit 22 includes: a radio frequency transceiver 221, a first transmitting component 222 and a first receiving component 223. During signal transmission and reception, the first balun 2221 and the second balun 2231 are used for conversion of balanced or unbalanced signals. This is because in a radio frequency system, an antenna may require a balanced signal to work, while a radio frequency transceiver may output or receive an unbalanced signal. The balun ensures the correct transmission and matching of the signal, reduces reflections and interference, and improves signal integrity and system efficiency.

[0036] The first surface acoustic wave filter 2222 is used in the transmitting link, and the second surface acoustic wave filter 2232 is used in the receiving link to isolate unnecessary frequency components and avoid frequency interference. In the scheme using active antenna transmission, the use of surface acoustic wave filter is particularly important because it can ensure the purity of the antenna signal, and at the same time provide additional filtering for the receiving link after the duplexer to prevent interference caused by the transmitting signal in the receiving path.

[0037] In the transmission link, the first power amplifier 2223 is used to increase the power of the signal and is connected to the transmission switch 23. In the vehicle-mounted scenario, due to the long distance between the antenna and the communication module, the loss of the RF cable is large, and the power amplifier needs to overcome these losses to ensure that the signal can be transmitted to the satellite with sufficient power. The selection and design of the power amplifier needs to balance the power output and vector amplitude error indicators to ensure the integrity of the signal and the communication quality.

[0038] In the receiving link, the first low noise amplifier 2233 is placed at the front end of the receiving signal path, close to the antenna, and connected to the receiving switch 24. This is because in vehicle-mounted applications, the RF cable from the antenna to the module is long, and the signal will suffer greater loss during transmission. The role of the low noise amplifier is to amplify these weak signals while minimizing the introduction of noise to improve the sensitivity of the receiving link. In the vehicle-mounted active antenna mode, the performance of the low noise amplifier directly affects the noise coefficient of the receiving link, and thus affects the receiving sensitivity of the entire system.

[0039] As an optional implementation, the active antenna module also includes: a time division duplexer; the second transmitting component includes: a first temperature-compensated attenuator, a third surface acoustic wave filter, a first resistance attenuator and a second power amplifier connected in sequence; the second receiving component includes: a second temperature-compensated attenuator, a second resistance attenuator, a fourth surface acoustic wave filter, a second low-noise amplifier, a fifth surface acoustic wave filter and a third low-noise amplifier connected in sequence; wherein the first temperature-compensated attenuator is connected to the transmitting switching switch, the second temperature-compensated attenuator is connected to the receiving switching switch, the second power amplifier and the third low-noise amplifier are both connected to the time division duplexer, and the time division duplexer is connected to the active antenna. The structural diagram of the active antenna module is as shown in FIG. Figure 3 shown.

[0040] like Figure 3 As shown, the time division duplexer 33 is used to isolate the transmit and receive signals, and is connected to the active antenna 34 to ensure that they operate simultaneously on the same antenna without interfering with each other. In the time division duplex mode, the use of the time division duplexer is not as frequent as in the frequency division duplex mode, but it still plays a key role in preventing the transmit signal from affecting the receive signal during the receive cycle.

[0041] In the active antenna transceiver assembly, in order to compensate for the impact of temperature changes in the vehicle environment on the performance of the RF circuit, the first temperature compensating attenuator 311 and the second temperature compensating attenuator 321 are used. In vehicle applications, the Tiantong satellite terminal may operate in a wide temperature range. The temperature compensating attenuator adjusts the gain to ensure the consistency of communication performance in high and low temperature environments, which is an important design consideration in the vehicle antenna solution.

[0042] In the receiving path of the active antenna transceiver component, two-stage low noise amplifiers are used, including a second low noise amplifier 324 and a third low noise amplifier 326, and surface acoustic wave filters, including a third surface acoustic wave filter 312, a fourth surface acoustic wave filter 323, and a fifth surface acoustic wave filter 325. The surface acoustic wave filter ensures the purity of the received signal, and the temperature compensated attenuator maintains the stability of signal processing at different temperatures.

[0043] In addition, Figure 3As shown, the active antenna module also includes: a first resistor attenuator 313 , a second resistor attenuator 322 , and a second power amplifier 314 .

[0044] Optionally, the communication mode switching switch also includes: a first RF connector, a second RF connector, a third RF connector and a fourth RF connector; the second transmitting component also includes: a fifth RF connector; the second receiving component also includes: a sixth RF connector; wherein the first RF connector is respectively connected to the transmitting switching switch and the passive antenna, the second RF connector is respectively connected to the transmitting switching switch and the fifth RF connector, the third RF connector is respectively connected to the receiving switching switch and the passive antenna, the fourth RF connector is respectively connected to the receiving switching switch and the sixth RF connector, the fifth RF connector is also connected to the first temperature compensated attenuator, and the sixth RF connector is also connected to the second temperature compensated attenuator.

[0045] As an optional implementation, a first binary control switch is also connected between the transmit switching switch and the second RF connector, and a second binary control switch is also connected between the fifth RF connector and the first temperature-compensated attenuator; the communication module also includes: a microcontroller unit, and a protocol conversion unit respectively connected to the microcontroller unit, the first binary control switch and the second binary control switch; wherein the microcontroller unit is used to control the first binary control switch and the second binary control switch to be turned on through the protocol conversion unit when there is data to be sent in the communication module, and to control the first binary control switch and the second binary control switch to be turned off through the protocol conversion unit when there is no data to be sent in the communication module.

[0046] Binary control switches are used to transmit simple binary information in control signal transmission. In active antenna systems, control signals modulated by binary control switches are transmitted via RF cables to turn on or off amplifiers in active antenna transceiver components, enabling remote control.

[0047] Optionally, both the passive antenna and the active antenna include: a satellite communication unit for communicating with a satellite and a navigation positioning unit for satellite positioning.

[0048] Among them, the main task of the satellite communication unit is to receive downlink signals from the satellite and transmit uplink signals. Usually, the satellite communication unit will use specific antenna types, such as parabolic antennas, spiral antennas or flat antennas, which have high gain and directivity to ensure effective communication with the satellite.

[0049] The navigation and positioning unit is used to receive signals from global navigation satellite systems such as GPS (Global Positioning System) and Beidou to achieve positioning and navigation functions. The navigation and positioning unit usually uses an omnidirectional antenna because the directionality of the navigation satellite signal is not important. What is important is to be able to receive satellite signals from multiple directions.

[0050] In an embodiment of the present application, a vehicle-mounted satellite communication terminal is provided, comprising: a communication module, a communication mode switching switch connected to the communication module, an active antenna module and a passive antenna module respectively connected to the communication mode switching switch, wherein the communication mode switching switch is used to respond to a first switching operation to control the vehicle-mounted satellite communication terminal to enter a handheld terminal communication mode, wherein in the handheld terminal communication mode, the communication module is used to communicate with the satellite through a passive antenna in the passive antenna module; the communication mode switching switch is also used to respond to a second switching operation to control the vehicle-mounted satellite communication terminal to enter a vehicle-mounted terminal communication mode, wherein in the vehicle-mounted terminal communication mode, the communication module is used to communicate with the satellite through an active antenna in the active antenna module. Through the terminal of the embodiment of the present application, the most suitable communication mode, i.e., passive antenna mode or active antenna mode, can be intelligently selected according to the use environment (handheld or vehicle-mounted) and power supply conditions. In the vehicle-mounted terminal communication mode, the signal attenuation is compensated by the active antenna module, which reduces the additional demand for terminal battery energy, thereby extending the communication time in the vehicle environment. In the handheld terminal communication mode, the use of a passive antenna module with lower power consumption can further save power and extend the standby time of the terminal, thereby ensuring that high-quality communication services can be maintained regardless of how the environmental signal conditions change, thereby solving the technical problem that the relevant satellite communication terminals cannot simultaneously meet the requirements of high-quality communication and long-term battery life for the terminal in the vehicle-mounted scenario.

[0051] Example 2

[0052] According to an embodiment of the present application, there is also provided a vehicle-mounted satellite communication system including the vehicle-mounted satellite communication terminal in Embodiment 1, such as Figure 4 As shown, the vehicle-mounted satellite communication system at least includes: a communication mode switching switch, an active antenna module and a passive antenna module respectively connected to the communication mode switching switch. The composition of each module is introduced in detail below with a specific embodiment:

[0053] Optionally, the communication module includes: a baseband processing unit and a radio frequency unit that are interconnected, wherein, in a signal sending mode, the baseband processing unit is used to encode, multiplex and modulate the data to be sent to obtain a first baseband signal, and the radio frequency unit is used to convert the first baseband signal into a first radio frequency signal, and send the first radio frequency signal to the satellite through an active antenna module or a passive antenna module; in a signal receiving mode, the radio frequency unit is used to convert a second radio frequency signal from the satellite received by the active antenna module or the passive antenna module into a second baseband signal, and the baseband processing unit is used to demodulate, deinterleave and decode the second baseband signal to obtain data to be received.

[0054] Among them, in the signal transmission mode, the baseband processing unit receives the data to be transmitted, encodes, multiplexes and modulates it, and generates a first baseband signal. Subsequently, the radio frequency unit converts the first baseband signal into a first radio frequency signal, and sends the signal to the satellite through an active antenna module or a passive antenna module. The active antenna module is used when the signal strength needs to be enhanced and the power supply is sufficient, while the passive antenna module is used when the power management is more stringent or the terminal is in handheld mode to reduce power consumption.

[0055] In the signal receiving mode, the RF unit is responsible for receiving the second RF signal from the satellite, which is transmitted through the active antenna module or the passive antenna module. The RF unit converts the second RF signal into a second baseband signal, and then the baseband processing unit demodulates, deinterleaves and decodes the second baseband signal to finally obtain the data to be received. The active antenna module reduces signal attenuation and improves the clarity of the received signal through a built-in low-noise amplifier, while the passive antenna module is used when the signal strength is sufficient to reduce system complexity and cost.

[0056] As an optional implementation, the radio frequency unit includes: a radio frequency transceiver, a first transmitting component connected to a transmitting end of the radio frequency transceiver, and a first receiving component connected to a receiving end of the radio frequency transceiver.

[0057] Optionally, the communication mode switching switch includes: a transmitting switching switch and a receiving switching switch; the passive antenna module includes: a passive antenna; the active antenna module includes: an active antenna, a second transmitting component and a second receiving component respectively connected to the active antenna; the transmitting switching switch is used to respond to a first switching operation, connect the first transmitting component and the passive antenna, and is also used to respond to a second switching operation, connect the first transmitting component and the second transmitting component; the receiving switching switch is used to respond to the first switching operation, connect the first receiving component and the passive antenna, and respond to the second switching operation, connect the first receiving component and the second receiving component.

[0058] The RF switch is used to switch between the handheld passive antenna terminal mode and the vehicle-mounted active antenna terminal mode. In the handheld mode, the terminal may use a passive antenna to save power; while in the vehicle-mounted mode, the RF switch switches the signal path to the active antenna transceiver component to overcome feeder line losses and ensure signal quality and communication efficiency during long-distance communications. The switching of the RF switch realizes the terminal's adaptive function in different scenarios.

[0059] Optionally, the first transmitting component includes: a first balun, a first surface acoustic wave filter and a first power amplifier connected in sequence, wherein the first balun is connected to the transmitting end of the RF transceiver, and the first power amplifier is connected to the transmitting switching switch; the first receiving component includes: a second balun, a second surface acoustic wave filter and a first low noise amplifier connected in sequence, wherein the second balun is connected to the receiving end of the RF transceiver, and the first low noise amplifier is connected to the receiving switching switch. The structural diagram of the communication module is as shown in Figure 2 shown.

[0060] As an optional implementation, the active antenna module also includes: a time division duplexer; the second transmitting component includes: a first temperature-compensated attenuator, a third surface acoustic wave filter, a first resistance attenuator and a second power amplifier connected in sequence; the second receiving component includes: a second temperature-compensated attenuator, a second resistance attenuator, a fourth surface acoustic wave filter, a second low-noise amplifier, a fifth surface acoustic wave filter and a third low-noise amplifier connected in sequence; wherein the first temperature-compensated attenuator is connected to the transmitting switching switch, the second temperature-compensated attenuator is connected to the receiving switching switch, the second power amplifier and the third low-noise amplifier are both connected to the time division duplexer, and the time division duplexer is connected to the active antenna.

[0061] In the active antenna transceiver assembly, a temperature-compensated attenuator is used to compensate for the impact of temperature changes in the vehicle environment on the performance of the RF circuit. In vehicle applications, the Tiantong satellite terminal may operate in a wide temperature range. The temperature-compensated attenuator adjusts the gain to ensure the consistency of communication performance in high and low temperature environments, which is an important design consideration in the vehicle antenna solution.

[0062] In the receiving path of the active antenna transceiver component, a two-stage low-noise amplifier is used, followed by a surface acoustic wave filter and a temperature-compensated attenuator. The surface acoustic wave filter ensures the purity of the received signal, and the temperature-compensated attenuator maintains the stability of signal processing under different temperatures.

[0063] Optionally, the communication mode switching switch also includes: a first RF connector, a second RF connector, a third RF connector and a fourth RF connector; the second transmitting component also includes: a fifth RF connector; the second receiving component also includes: a sixth RF connector; wherein the first RF connector is respectively connected to the transmitting switching switch and the passive antenna, the second RF connector is respectively connected to the transmitting switching switch and the fifth RF connector, the third RF connector is respectively connected to the receiving switching switch and the passive antenna, the fourth RF connector is respectively connected to the receiving switching switch and the sixth RF connector, the fifth RF connector is also connected to the first temperature compensated attenuator, and the sixth RF connector is also connected to the second temperature compensated attenuator.

[0064] As an optional implementation, a first binary control switch is also connected between the transmit switching switch and the second RF connector, and a second binary control switch is also connected between the fifth RF connector and the first temperature-compensated attenuator; the communication module also includes: a microcontroller unit, and a protocol conversion unit respectively connected to the microcontroller unit, the first binary control switch and the second binary control switch; wherein the microcontroller unit is used to control the first binary control switch and the second binary control switch to be turned on through the protocol conversion unit when there is data to be sent in the communication module, and to control the first binary control switch and the second binary control switch to be turned off through the protocol conversion unit when there is no data to be sent in the communication module.

[0065] Optionally, both the passive antenna and the active antenna include: a satellite communication unit for communicating with a satellite and a navigation positioning unit for satellite positioning.

[0066] It should be noted that each module in the vehicle-mounted satellite communication system in the embodiment of the present application corresponds one-to-one to each implementation step of the vehicle-mounted satellite communication terminal in Example 1. Since a detailed description has been given in Example 1, some details not reflected in this embodiment can be referred to Example 1 and will not be repeated here.

[0067] The serial numbers of the above embodiments are only for description and do not represent the advantages or disadvantages of the embodiments.

[0068] In the above embodiments of the present application, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, please refer to the relevant description of other embodiments.

[0069] In the several embodiments provided in this application, it should be understood that the disclosed technical content can be implemented in other ways. Among them, the device embodiments described above are only schematic. For example, the division of units can be a logical function division. There may be other division methods in actual implementation. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of units or modules, which can be electrical or other forms.

[0070] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed over multiple units. Some or all of the units may be selected according to actual needs to achieve the purpose of the present embodiment.

[0071] In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above-mentioned integrated unit may be implemented in the form of hardware or in the form of software functional units.

[0072] If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application, or the part that contributes to the prior art or all or part of the technical solution, can be embodied in the form of a software product, which is stored in a storage medium and includes several instructions for a computer device (which can be a personal computer, server or network device, etc.) to perform all or part of the steps of each embodiment method of the present application. The aforementioned storage medium includes: U disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), mobile hard disk, disk or optical disk, etc. Various media that can store program codes.

[0073] The above are only preferred implementations of the present application. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present application. These improvements and modifications should also be regarded as the scope of protection of the present application.

Claims

1. A vehicle-mounted satellite communication terminal, characterized in that: include: A communication module, a communication mode switching switch connected to the communication module, and an active antenna module and a passive antenna module respectively connected to the communication mode switching switch, wherein: The communication mode switching switch is used to respond to a first switching operation to control the vehicle-mounted satellite communication terminal to enter a handheld terminal communication mode, wherein in the handheld terminal communication mode, the communication module is used to communicate with a satellite through a passive antenna in the passive antenna module; The communication mode switching switch is also used to respond to a second switching operation to control the vehicle-mounted satellite communication terminal to enter the vehicle-mounted terminal communication mode, wherein in the vehicle-mounted terminal communication mode, the communication module is used to communicate with the satellite through the active antenna in the active antenna module.

2. The terminal according to claim 1, characterized in that The communication module includes: a baseband processing unit and a radio frequency unit connected to each other, wherein: In the signal transmission mode, the baseband processing unit is used to encode, multiplex and modulate the data to be transmitted to obtain a first baseband signal, and the radio frequency unit is used to convert the first baseband signal into a first radio frequency signal, and send the first radio frequency signal to the satellite through the active antenna module or the passive antenna module; In the signal receiving mode, the radio frequency unit is used to convert the second radio frequency signal from the satellite received by the active antenna module or the passive antenna module into a second baseband signal, and the baseband processing unit is used to demodulate, deinterleave and decode the second baseband signal to obtain the data to be received.

3. The terminal according to claim 2, characterized in that: The radio frequency unit includes: a radio frequency transceiver, a first transmitting component connected to the transmitting end of the radio frequency transceiver, and a first receiving component connected to the receiving end of the radio frequency transceiver; The communication mode switching switch includes: a transmitting switching switch and a receiving switching switch; The passive antenna module includes: a passive antenna; The active antenna module comprises: an active antenna, a second transmitting component and a second receiving component respectively connected to the active antenna; The transmitting switch is used to connect the first transmitting component and the passive antenna in response to the first switching operation, and to connect the first transmitting component and the second transmitting component in response to the second switching operation; The receiving switch is used to connect the first receiving component and the passive antenna in response to the first switching operation, and to connect the first receiving component and the second receiving component in response to the second switching operation.

4. The terminal according to claim 3, characterized in that: The first transmitting component includes: a first balun, a first surface acoustic wave filter and a first power amplifier connected in sequence, wherein the first balun is connected to the transmitting end of the RF transceiver, and the first power amplifier is connected to the transmitting switch; The first receiving component includes: a second balun, a second surface acoustic wave filter and a first low noise amplifier connected in sequence, wherein the second balun is connected to the receiving end of the RF transceiver, and the first low noise amplifier is connected to the receiving switching switch.

5. The terminal according to claim 3, characterized in that: The active antenna module also includes: a time division duplexer; The second transmitting assembly includes: a first temperature-compensated attenuator, a third surface acoustic wave filter, a first resistance attenuator and a second power amplifier connected in sequence; The second receiving component includes: a second temperature-compensated attenuator, a second resistance attenuator, a fourth surface acoustic wave filter, a second low-noise amplifier, a fifth surface acoustic wave filter and a third low-noise amplifier connected in sequence; The first temperature-compensated attenuator is connected to the transmitting switch, the second temperature-compensated attenuator is connected to the receiving switch, the second power amplifier and the third low-noise amplifier are both connected to the time-division duplexer, and the time-division duplexer is connected to the active antenna.

6. The terminal according to claim 5, characterized in that: The communication mode switching switch also includes: a first RF connector, a second RF connector, a third RF connector and a fourth RF connector; The second transmitting component also includes: a fifth radio frequency connector; The second receiving component also includes: a sixth radio frequency connector; Among them, the first RF connector is connected to the transmit switching switch and the passive antenna respectively, the second RF connector is connected to the transmit switching switch and the fifth RF connector respectively, the third RF connector is connected to the receive switching switch and the passive antenna respectively, the fourth RF connector is connected to the receive switching switch and the sixth RF connector respectively, the fifth RF connector is also connected to the first temperature compensated attenuator, and the sixth RF connector is also connected to the second temperature compensated attenuator.

7. The terminal according to claim 6, characterized in that: A first binary control switch is further connected between the transmission switching switch and the second RF connector, and a second binary control switch is further connected between the fifth RF connector and the first temperature-compensated attenuator; The communication module further includes: a micro control unit, and a protocol conversion unit respectively connected to the micro control unit, the first binary control switch and the second binary control switch; The micro control unit is used to control the first binary control switch and the second binary control switch to be turned on through the protocol conversion unit when there is data to be sent in the communication module, and to control the first binary control switch and the second binary control switch to be turned off through the protocol conversion unit when there is no data to be sent in the communication module.

8. The terminal according to claim 5, characterized in that: The passive antenna and the active antenna both include: a satellite communication unit for communicating with the satellite and a navigation positioning unit for satellite positioning.

9. The terminal according to claim 6, characterized in that: The communication module, the communication mode switch and the passive antenna module are all integrated on the access point carrier board; The second RF connector is connected to the fifth RF connector via a RF cable, the fourth RF connector is connected to the sixth RF connector via a RF cable, and the time division duplexer is connected to the active antenna via a RF cable.

10. A vehicle-mounted satellite communication system, characterized in that: include: The vehicle-mounted satellite communication terminal as described in any one of claims 1 to 9.

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