A radio frequency communication system and satellite communication equipment

Abstract

An embodiment of the present invention discloses a radio frequency communication system and satellite communication equipment. The radio frequency communication system includes a channel switching module, a transmission modulation module, a reception demodulation module, and a communication control module. When the communication control module is in a standby state or a receiving state, the communication control module controls the channel switching module to connect with the reception demodulation module so as to receive signals sent by an external device in real time. When the communication control module is in a transmitting state, the communication module controls the channel switching module to connect with the transmission modulation module so as to send signals to the external device. The communication control module in the radio frequency communication system of the embodiment of the present invention can control the channel switching module according to the communication state, thereby switching the communication channel in real time, reducing the packet loss rate of communication, while also avoiding interference between the self-transmitting and self-receiving states, and improving the stability of communication.

Description

Technical Field

[0001] The embodiments of the present application relate to the field of communications, and in particular to a radio frequency communication system and satellite communication equipment. Background Art

[0002] With the rapid development of satellite communication technology, satellite communication systems are widely used due to their advantages, including high transmission power, high accuracy, large transmission capacity, strong anti-interference capabilities, good networking flexibility, and adaptability to rapid system deployment in emergencies to ensure communication services. However, existing satellite communication systems often fail to switch between transmit and receive channels in a timely manner, resulting in packet loss and reduced communication stability. Summary of the Invention

[0003] The embodiments of the present invention provide a radio frequency communication system and satellite communication equipment, which solve the technical problem of low communication stability of the radio frequency communication system in the prior art.

[0004] In a first aspect, an embodiment of the present invention provides a radio frequency communication system, comprising: a channel switching module, a transmission modulation module, a reception demodulation module, and a communication control module;

[0005] The communication control module is connected to the channel switching module, the transmit modulation module and the receive demodulation module, and is used to control the channel switching module to connect with the receive demodulation module in a standby state or a receive state to receive a handshake signal sent by the receive demodulation module; and is used to switch to the receive state when the handshake signal is received; and is used to control the channel switching module to connect with the receive demodulation module in the receive state to receive a first baseband signal sent by the receive demodulation module; and is used to control the channel switching module to connect with the transmit modulation module in the transmit state to send a second baseband signal to the transmit modulation module;

[0006] The transmission modulation module is used to receive the second baseband signal, convert the second baseband signal into a second modulation signal, and send the second modulation signal to the external device through the channel switching module;

[0007] The receiving and demodulating module is used to receive the first modulation signal or the handshake modulation signal sent by the channel switching module, convert the first modulation signal into the first baseband signal and transmit it to the communication control module, and convert the handshake modulation signal into a handshake signal and transmit it to the communication control module;

[0008] The channel switching module is used to connect with the transmitting modulation module or the receiving demodulation module under the control of the communication control module; receive the handshake modulation signal or the first modulation signal sent by the external device, and send the handshake modulation signal or the first modulation signal to the receiving demodulation module; and receive the second modulation signal sent by the transmitting modulation module, and send the second modulation signal to the external device.

[0009] Preferably, the communication control module is specifically configured to switch to the receiving state when receiving a handshake signal with a duration greater than a first preset duration.

[0010] Preferably, the transmit modulation module is specifically used to modulate the second baseband signal with a level of 0 into a second modulation signal with a first frequency, and to modulate the second baseband signal with a level of 1 into a second modulation signal with a second frequency.

[0011] Preferably, the receiving demodulation module is specifically used to demodulate the first modulated signal of the first frequency into a first baseband signal with a level of 0, and to demodulate the first modulated signal of the second frequency into a first baseband signal with a level of 1.

[0012] Preferably, the first frequency is 590 KHz and the second frequency is 710 KHz.

[0013] Preferably, the transmit modulation module further includes a first gain adjustment circuit, and the first gain adjustment circuit is used to adjust the power of the second modulation signal to a first power range.

[0014] Preferably, the first power range is -5dBm to -15dBm.

[0015] Preferably, the receiving demodulation module includes a second gain adjustment circuit and a signal demodulation circuit;

[0016] The input end of the second gain adjustment circuit is connected to the channel switching module, and the output end of the second gain adjustment circuit is connected to the input end of the signal demodulation circuit, and is used to receive the first modulation signal or the handshake modulation signal, adjust the power of the first modulation signal or the handshake modulation signal to a second power range, and then send the adjusted first modulation signal or the adjusted handshake modulation signal to the signal demodulation circuit;

[0017] The output end of the signal demodulation circuit is connected to the communication control module, and is used to convert the adjusted first modulation signal into the first baseband signal and transmit it to the communication control module, and to convert the adjusted handshake modulation signal into the handshake signal and transmit the handshake signal to the communication control module.

[0018] Preferably, the second gain adjustment circuit includes a power detection unit, an operational amplifier, an attenuator and an amplifier;

[0019] The first end of the attenuator is connected to the channel switching module, and is used to receive the first modulation signal or the handshake modulation signal. The second end of the attenuator is connected to the output end of the operational amplifier, and is used to receive the control voltage signal output by the operational amplifier, and adjust the gain coefficient according to the control voltage signal; the output end of the attenuator is connected to the input end of the amplifier, and is used to adjust the power of the first modulation signal or the handshake modulation signal according to the gain coefficient, and output the power-adjusted first modulation signal or the power-adjusted handshake modulation signal to the amplifier;

[0020] The output end of the amplifier is connected to the input end of the power detection unit and the input end of the signal demodulation circuit, and the amplifier is used to amplify the power-adjusted first modulation signal or the power-adjusted handshake modulation signal, and output the amplified first modulation signal or the amplified handshake modulation signal to the power detection unit and the signal demodulation circuit;

[0021] The output end of the power detection unit is connected to the first input end of the operational amplifier, and is used to convert the power of the amplified first modulation signal or the power of the amplified handshake modulation signal into a first voltage signal, and transmit the first voltage signal to the first input end of the operational amplifier;

[0022] The second input terminal of the operational amplifier is used to receive a reference voltage signal, and to compare the first voltage signal with the reference voltage signal and then output the control voltage signal to the attenuator.

[0023] In a second aspect, an embodiment of the present invention provides a satellite communication device, comprising a radio frequency communication system as described in the first aspect.

[0024] An embodiment of the present invention provides a radio frequency communication system, comprising a channel switching module, a transmission modulation module, a reception demodulation module, and a communication control module. When the communication control module is in a standby state or a receiving state, the communication control module controls the channel switching module to connect with the reception demodulation module so as to receive signals sent by an external device in real time. When the communication control module is in a transmitting state, the communication module controls the channel switching module to connect with the transmission modulation module so as to send signals to the external device. The communication control module in the radio frequency communication system of the embodiment of the present invention can control the channel switching module according to the communication state, thereby switching communication channels in real time, reducing the packet loss rate of communication, while also avoiding interference between the self-transmitting and self-receiving states, and improving the stability of communication. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 A schematic structural diagram of a radio frequency communication system provided by an embodiment of the present invention.

[0026] Figure 2 A schematic structural diagram of another radio frequency communication system provided by an embodiment of the present invention.

[0027] Figure 3 A schematic structural diagram of a second gain adjustment circuit provided by an embodiment of the present invention.

[0028] Reference numerals:

[0029] Channel switching module 10, receiving demodulation module 20, transmitting modulation module 30, communication control module 40, first gain adjustment circuit 31, second gain adjustment circuit 21, signal demodulation circuit 22, power detection unit Power Detect, operational amplifier Op-amp, attenuator ATT, amplifier PA. DETAILED DESCRIPTION

[0030] The following description and accompanying drawings sufficiently illustrate specific embodiments of the present application to enable those skilled in the art to practice them. The examples represent only possible variations. Unless expressly required, individual components and functions are optional, and the order of operations may vary. Portions and features of some embodiments may be included in or replace portions and features of other embodiments. The scope of the embodiments of the present application includes the entire scope of the claims, as well as all available equivalents of the claims. Herein, each embodiment may be referred to individually or collectively by the term "invention," which is merely for convenience and is not intended to automatically limit the scope of the application to any single invention or inventive concept if more than one invention is in fact disclosed. Herein, relational terms such as first and second, etc., are used solely to distinguish one entity or operation from another, and do not require or imply any actual relationship or order between these entities or operations. Furthermore, the terms "comprise," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, or apparatus comprising a set of elements includes not only those elements, but also other elements not explicitly listed. The various embodiments herein are described in a progressive manner, with each embodiment focusing on the differences from the other embodiments. Reference can be made to the common and similar parts between the various embodiments. For structures, products, etc. disclosed in the embodiments, the description is relatively simple because they correspond to the parts disclosed in the embodiments. For relevant parts, refer to the method description.

[0031] The embodiment of the present invention provides a radio frequency communication system, such as Figure 1 As shown, Figure 1 This is a structural diagram of a radio frequency communication system provided by an embodiment of the present invention. The radio frequency communication system provided by an embodiment of the present invention includes: a channel switching module 10, a transmission modulation module 30, a reception demodulation module 20 and a communication control module 40.

[0032] The communication control module 40 is connected to the channel switching module 10, the transmitting modulation module 30 and the receiving demodulation module 20, and is used to control the channel switching module 10 to be connected to the receiving demodulation module 20 in the standby state or the receiving state, and to receive the handshake signal sent by the demodulation module 20; and to switch to the receiving state when the handshake signal is received; and to control the channel switching module 10 to be connected to the receiving demodulation module 20 in the receiving state, and to receive the first baseband signal sent by the demodulation module 20; and to control the channel switching module 10 to be connected to the transmitting modulation module 30 in the transmitting state, and to send the second baseband signal to the transmitting modulation module 30.

[0033] In this embodiment, the radio frequency communication system includes a communication control module 40, which is used to switch the communication state of the radio frequency communication system and transmit signals with external devices. Specifically, the communication control module 40 is connected to the channel switching module 10, the transmission modulation module 30, and the reception demodulation module 20. When the radio frequency communication system does not need to transmit or receive signals for a long time, the communication control module 40 can enter a standby state; when the radio frequency communication system needs to send a signal to an external device, the communication control module 40 needs to switch to a transmission state; when the radio frequency communication system needs to receive a signal sent by an external device, the communication control module 40 needs to switch to a reception state. When the communication control module 40 is in the standby state, the communication control module 40 needs to control the channel switching module 10 to connect to the reception demodulation module 20 so that when the external device has information sent to the communication control module 40, the communication control module 40 can receive the information.

[0034] In the standby mode, when the communication control module 40 receives a handshake signal from the receive demodulation module 20, it indicates that an external device needs to send information to the RF communication system, and the communication control module 40 needs to switch to the receive mode. In another embodiment, the communication control module 40 can also periodically and automatically switch to the receive mode. In the receive mode, the communication control module 40 needs to control the channel switching module 10 to connect with the receive demodulation module 20. It will be understood that when switching from the standby mode to the receive mode, there is no need to control the channel switching module 10. In the receive mode, after the communication control module 40 receives the first baseband signal sent by the receive demodulation module 20, the communication control module 40 parses the first baseband signal. When feedback of the first baseband signal is required, the communication control module 40 switches to the transmit mode and controls the channel switching module 10 to connect with the transmit modulation module 30, so that the transmit modulation module 30 can subsequently transmit the second baseband signal to the external device. The communication control module 40 then generates a second baseband signal and sends the second baseband signal to the transmit modulation module 30.

[0035] The transmission modulation module 30 is used to receive the second baseband signal, convert the second baseband signal into a second modulation signal, and send the second modulation signal to the external device through the channel switching module 10.

[0036] The transmit modulation module 30 is configured to modulate the second baseband signal, after receiving it from the communication control module 40, to convert the second baseband signal into a second modulated signal. Since the transmit modulation module 30 is connected to the channel switching module 10 in the transmit state, the transmit modulation module 30 can transmit the second modulated signal to an external device via the channel switching module 10. In one embodiment, the transmit modulation module 30 can utilize the LTC6900 as its main control chip. The LTC6900 is a high-precision (Frequency Error <1.5% Max) and compact oscillator capable of compiling output frequencies from 1 kHz to 20 MHz. This oscillator can reduce the size of the RF communication system while ensuring communication reliability.

[0037] The receiving and demodulating module 20 is used to receive the first modulation signal or the handshake modulation signal sent by the channel switching module 10, convert the first modulation signal into a first baseband signal and transmit it to the communication control module 40, and convert the handshake modulation signal into a handshake signal and transmit it to the communication control module 40.

[0038] The receiving and demodulating module 20 is used to receive the first modulation signal or the handshake modulation signal from the channel switching module 10. Specifically, in the standby state, the handshake modulation signal is received, and in the receiving state, the first modulation signal is received. After receiving the first modulation signal, the receiving and demodulating module 20 will demodulate the first modulation signal, convert the first modulation signal into a first baseband signal, and then transmit the first baseband signal to the communication control module 40. When the receiving and demodulating module 20 receives the handshake modulation signal sent by the channel switching module 10, it will also demodulate the handshake modulation signal, convert the handshake modulation signal into a handshake signal, and then send the handshake signal to the communication control module 40. In one embodiment, the receiving and demodulating module 20 can use SA614 as the main control chip. SA614 is a wide-band, high-precision demodulator that can ensure the reliability of communication.

[0039] The channel switching module 10 is used to connect to the transmitting modulation module 30 or the receiving demodulation module 20 under the control of the communication control module 40; receive the handshake modulation signal or the first modulation signal sent by the external device, and send the handshake modulation signal or the first modulation signal to the receiving demodulation module 20; and receive the second modulation signal sent by the transmitting modulation module 30, and send the second modulation signal to the external device.

[0040] The channel switching module 10 is used to connect to the transmission modulation module 30 or the reception demodulation module 20 under the control of the communication control module 40. Specifically, in the standby state or the receiving state, it is connected to the reception demodulation module 20, and in the transmitting state, it is connected to the transmission modulation module 30.

[0041] The external device is in communication with the channel switching module 10. Specifically, when the external device needs to transmit information to the communication control module 40, the external device generates a handshake modulation signal and transmits the handshake modulation signal to the receiving demodulation module 20 through the channel switching module 10, so that the communication control module 40 enters the receiving state. After that, the external device can send a first modulation signal to the channel switching module 10. In the transmitting state, the channel switching module 10 is also used to receive a second modulation signal sent by the transmitting modulation module 30 and send the second modulation signal to the external device.

[0042] For example, when the communication control module 40 is in the standby state, the control channel switching module 10 is connected to the receiving and demodulating module 20, and is always ready to receive signals from external devices. When the external device needs to read the signal of the communication control module 40, it will first send a handshake modulation signal for handshake confirmation. After the receiving and demodulating module 20 demodulates the handshake modulation signal to obtain a handshake signal, it sends the handshake signal to the communication control module 40. After receiving the handshake signal, the communication control module 40 immediately cancels the standby state and enters the receiving state. After the communication control module 40 enters the receiving state, the external device sends a first modulation signal. The first modulation signal is sent to the receiving and demodulating module 20 through the channel switching module 10. The receiving and demodulating module 20 demodulates the first modulation signal into a first baseband signal and transmits it to the communication control module 40. After receiving the first modulation signal, the communication control module 40 parses the first modulation signal. After the analysis is complete, the communication control module 40 switches to the transmitting state, controls the channel switching module 10 to connect with the transmit modulation module 30, generates a second baseband signal, and sends the second baseband signal to the transmit modulation module 30. The transmit modulation module 30 modulates the second baseband signal to generate a second modulated signal, and sends the second modulated signal to the external device through the channel switching module 10. At the same time, the communication control module 40 controls itself to enter the standby state or the receiving state, controls the channel switching module 10 to connect with the receive demodulation module 20, and waits for the next communication demand.

[0043] As described above, an embodiment of the present invention provides a radio frequency communication system, which includes a channel switching module, a transmission modulation module, a reception demodulation module, and a communication control module. When the communication control module is in a standby state or a receiving state, the communication control module controls the channel switching module to connect with the reception demodulation module so as to receive signals sent by an external device in real time. When the communication control module is in a transmitting state, the communication module can control the channel switching module to connect with the transmission modulation module so as to send signals to the external device. The communication control module in the radio frequency communication system of the embodiment of the present invention can control the channel switching module according to the communication state, thereby switching the communication channel in real time, reducing the packet loss rate of communication, while also avoiding interference between the self-transmitting and self-receiving states, and improving the stability of communication.

[0044] On the basis of the above embodiment, the communication control module 40 is specifically configured to switch to the receiving state when receiving a handshake signal with a duration greater than a first preset duration.

[0045] In one embodiment, to ensure that the communication control module 40 is not affected by transient interference signals during communication, the external device must first send a handshake modulation signal with a duration of not less than a first preset duration to the RF communication system when communicating with the RF communication system. The receiving and demodulating module 20 receives the handshake modulation signal, demodulates it into a handshake signal, and sends it to the communication control module 40. Upon receiving a handshake signal with a duration greater than the first preset duration, the communication control module 40 switches from a standby state to a receiving state. The first preset duration can be set according to actual needs. For example, the first preset duration can be set to 10ms. The handshake confirmation of not less than 10ms is a means of ensuring that the communication control module 40 is not interfered with during communication.

[0046] Based on the above embodiment, the transmit modulation module 30 is specifically used to modulate the second baseband signal with a level of 0 into a second modulation signal with a first frequency, and to modulate the second baseband signal with a level of 1 into a second modulation signal with a second frequency.

[0047] In this embodiment, the baseband signal includes a signal with a level of 1 and a signal with a level of 0. The transmit modulation module 30 is specifically configured to modulate baseband signals of different levels into modulation signals of different frequencies. Specifically, the transmit modulation module 30 is configured to modulate a second baseband signal with a level of 0 into a second modulation signal with a first frequency, for example, the first frequency range may be 590 kHz. The transmit modulation module 30 is also configured to modulate a second baseband signal with a level of 1 into a second modulation signal with a second frequency, for example, the second frequency range may be 750 kHz. By modulating baseband signals of different levels into modulation signals of different frequencies, interference can be avoided during communication.

[0048] Based on the above embodiment, the receiving demodulation module 20 is specifically configured to demodulate the first modulated signal of the first frequency into a first baseband signal with a level of 0, and to demodulate the first modulated signal of the second frequency into a first baseband signal with a level of 1.

[0049] In contrast, the receiving and demodulating module 20 is configured to demodulate modulated signals of different frequencies into baseband signals of different levels. Specifically, the receiving and demodulating module 20 is configured to demodulate a first modulated signal of a first frequency into a first baseband signal with a level of 0, for example, demodulating a first modulated signal of 590 kHz into a first baseband signal with a level of 0; and demodulating a first modulated signal of a second frequency into a first baseband signal with a level of 1, for example, demodulating a second modulated signal of 710 kHz into a first baseband signal with a level of 1.

[0050] In one embodiment, the indicators of the transmitted and received signals of the radio frequency communication system are as follows:

[0051] Transmitter: Frequency 650KHz±5%

[0052] Frequency deviation ±60KHz Nominal

[0053] Deviation tolerance ±50KHz Minimum; ±70KHz Maximum

[0054] Output level -5~-15dBm

[0055] Output impedance 50Ω

[0056] Initial tuning frequency 710KHz

[0057] Initial tuning time 10ms Minimum

[0058] Receiving: Lock range tolerance ±32.5KHz

[0059] Input impedance 50Ω

[0060] Input level -15dBm

[0061] On the basis of the above embodiment, the transmit modulation module 30 further includes a first gain adjustment circuit 31 , which is configured to adjust the power of the second modulation signal to a first power range.

[0062] In one embodiment, if Figure 2 As shown, the transmit modulation module 30 also includes a first gain adjustment circuit 31, which is used to adjust the power of the second modulated signal to a first power range. Exemplarily, the first gain adjustment circuit 31 can be a fixed attenuator ATT. After the transmit modulation module 30 generates the second modulated signal, the fixed attenuator ATT adjusts the power of the second modulated signal to the first power range before transmitting it to the external device via the channel switching module 10. In one embodiment, the first power range is -5dBm to -15dBm.

[0063] Based on the above embodiment, the receiving demodulation module 20 includes a second gain adjustment circuit 21 and a signal demodulation circuit 22 .

[0064] The input end of the second gain adjustment circuit 21 is connected to the channel switching module 10, and the output end of the second gain adjustment circuit 21 is connected to the input end of the signal demodulation circuit 22, and is used to receive the first modulation signal or the handshake modulation signal, adjust the power of the first modulation signal or the handshake modulation signal to the second power range, and then send the adjusted first modulation signal or the adjusted handshake modulation signal to the signal demodulation circuit 22.

[0065] The output end of the signal demodulation circuit 22 is connected to the communication control module 40, and is used to convert the adjusted first modulation signal into a first baseband signal and transmit it to the communication control module 40, and to convert the adjusted handshake modulation signal into a handshake signal and transmit the handshake signal to the communication control module 40.

[0066] In one embodiment, if Figure 2 As shown, the receiving demodulation module 20 includes a second gain adjustment circuit 21 and a signal demodulation circuit 22, wherein the input end of the second gain adjustment circuit 21 is connected to the channel switching module 10, and the output end of the second gain adjustment circuit 21 is connected to the input end of the signal demodulation circuit 22. The second gain adjustment circuit 21 is used to receive the first modulation signal or the handshake modulation signal sent by the channel switching module 10, adjust the power of the first modulation signal or the handshake modulation signal to a second power range, and then send the power-adjusted first modulation signal or the power-adjusted handshake modulation signal to the signal demodulation circuit 22. In one embodiment, the second gain adjustment circuit 21 meets the power output of -15dBm.

[0067] The signal demodulation circuit 22 then demodulates the first modulated signal after power adjustment to obtain a first baseband signal, and transmits the first baseband signal to the communication control module 40, and demodulates the handshake modulated signal after power adjustment to obtain a handshake signal, and transmits the handshake signal to the communication control module 40.

[0068] On the basis of the above embodiment, the second gain adjustment circuit 21 includes a power detection unit Power Detect, an operational amplifier Op-amp, an attenuator ATT and an amplifier PA;

[0069] The first end of the attenuator ATT is connected to the channel switching module 10 for receiving a first modulation signal or a handshake modulation signal. The second end of the attenuator ATT is connected to the output end of the operational amplifier Op-amp for receiving a control voltage signal output by the operational amplifier Op-amp and adjusting the gain coefficient according to the control voltage signal. The output end of the attenuator ATT is connected to the input end of the amplifier PA for adjusting the power of the first modulation signal or the handshake modulation signal according to the gain coefficient and outputting the power-adjusted first modulation signal or the power-adjusted handshake modulation signal to the amplifier PA.

[0070] In one embodiment, if Figure 3As shown, the second gain adjustment circuit 21 also includes a power detection unit PowerDetect, an operational amplifier Op-amp, an attenuator ATT, and an amplifier PA. A first end of the attenuator ATT is connected to the channel switching module 10 for receiving the first modulation signal or the handshake modulation signal sent by the channel switching module 10. A second end of the attenuator ATT is connected to the output end of the operational amplifier Op-amp for receiving a control voltage signal output by the operational amplifier Op-amp and adjusting its gain coefficient based on the control voltage signal output by the operational amplifier Op-amp.

[0071] After adjusting the gain coefficient, the attenuator ATT can adjust the power of the first modulation signal or the power of the handshake modulation signal according to the gain coefficient, and output the power-adjusted first modulation signal or the power-adjusted handshake modulation signal to the amplifier PA.

[0072] The output end of the amplifier PA is connected to the input end of the power detection unit Power Detect and the input end of the signal demodulation circuit 22. The amplifier PA is used to amplify the power-adjusted first modulation signal or the power-adjusted handshake modulation signal, and output the amplified first modulation signal or the amplified handshake modulation signal to the power detection unit Power Detect and the signal demodulation circuit 22.

[0073] The output end of the amplifier PA is connected to the input end of the power detection unit Power Detect and the input end of the signal demodulation circuit 22. The amplifier PA is used to receive the power-adjusted first modulation signal or the power-adjusted handshake modulation signal output by the attenuator ATT, amplify the power-adjusted first modulation signal or the power-adjusted handshake modulation signal, and output the amplified first modulation signal or the amplified handshake modulation signal to the power detection unit PowerDetect and the signal demodulation circuit.

[0074] The output end of the power detection unit Power Detect is connected to the first input end of the operational amplifier Op-amp, and is used to convert the power of the amplified first modulated signal or the power of the amplified handshake modulated signal into a first voltage signal, and then transmit the first voltage signal to the first input end of the operational amplifier Op-amp.

[0075] The output end of the power detection unit Power Detect is connected to the first input end of the operational amplifier Op-amp. The power detection unit Power Detect is used to detect the power of the amplified first modulated signal or the power of the amplified handshake modulated signal, and convert the detected power into a first voltage signal, and then transmit the first voltage signal to the first input end of the operational amplifier Op-amp.

[0076] The second input terminal of the operational amplifier Op-amp is used to receive a reference voltage signal, and to compare the first voltage signal with the reference voltage signal and then output a control voltage signal to the attenuator ATT.

[0077] In this embodiment, the second input terminal of the operational amplifier Op-amp is used to receive the reference voltage signal REF. After receiving the first voltage signal, the operational amplifier Op-amp is used to integrate and compare the first voltage signal and the reference voltage signal REF, and output a control voltage signal to the attenuator ATT based on the comparison result.

[0078] As described above, an embodiment of the present invention provides a radio frequency communication system, which includes a channel switching module, a transmission modulation module, a reception demodulation module, and a communication control module. When the communication control module is in a standby state or a receiving state, the communication control module controls the channel switching module to connect with the reception demodulation module so as to receive signals sent by an external device in real time. When the communication control module is in a transmitting state, the communication module can control the channel switching module to connect with the transmission modulation module so as to send signals to the external device. The communication control module in the radio frequency communication system of the embodiment of the present invention can control the channel switching module according to the communication state, thereby switching the communication channel in real time, reducing the packet loss rate of communication, while also avoiding interference between the self-transmitting and self-receiving states, and improving the stability of communication.

[0079] In addition, the transmit modulation module and receive demodulation module in this embodiment of the present invention each incorporate a first gain adjustment circuit and a second gain adjustment circuit, respectively. These circuits can amplify and attenuate signals as needed, meeting the level and amplitude requirements at each stage. This ensures communication stability over varying transmission distances, both long and short. Furthermore, both the transmit modulation module (LTC6900) and the receive demodulation module (SA614) utilize high-precision, miniaturized control chips, saving space while further ensuring communication reliability.

[0080] An embodiment of the present invention also provides a satellite communication device, comprising the aforementioned radio frequency communication system. The radio frequency communication system comprises a channel switching module, a transmission modulation module, a reception demodulation module, and a communication control module. When the communication control module is in a standby state or a receiving state, the communication control module controls the channel switching module to connect to the reception demodulation module to receive signals sent by an external device in real time. When the communication control module is in a transmitting state, the communication module controls the channel switching module to connect to the transmission modulation module to send signals to an external device. The communication control module in the radio frequency communication system of the embodiment of the present invention can control the channel switching module according to the communication state, thereby switching communication channels in real time, reducing the packet loss rate of communication, while also avoiding interference between the self-transmitting and self-receiving states, and improving the stability of communication.

[0081] Note that the above are only preferred embodiments of the present invention and the technical principles used. Those skilled in the art will understand that the embodiments of the present invention are not limited to the specific embodiments described herein, and that various obvious changes, readjustments, and substitutions can be made by those skilled in the art without departing from the scope of protection of the embodiments of the present invention. Therefore, although the embodiments of the present invention are described in more detail through the above embodiments, the embodiments of the present invention are not limited to the above embodiments. Without departing from the concept of the embodiments of the present invention, the embodiments of the present invention may also include more other equivalent embodiments, and the scope of the embodiments of the present invention is determined by the scope of the appended claims.

Claims

1. A radio frequency communication system, characterized in that: include: Channel switching module, transmission modulation module, reception demodulation module and communication control module; The communication control module is connected to the channel switching module, the transmission modulation module and the reception demodulation module, and is used to control the channel switching module to connect with the reception demodulation module in a standby state or a receiving state, and receive a handshake signal sent by the reception demodulation module; and for switching to the receiving state when receiving the handshake signal; and configured to control the channel switching module to connect to the receiving and demodulating module in the receiving state to receive the first baseband signal sent by the receiving and demodulating module; and for controlling the channel switching module to connect to the transmit modulation module and sending a second baseband signal to the transmit modulation module in a transmitting state; The transmission modulation module is used to receive the second baseband signal, convert the second baseband signal into a second modulation signal, and send the second modulation signal to the external device through the channel switching module; The receiving and demodulating module is used to receive the first modulation signal or the handshake modulation signal sent by the channel switching module, convert the first modulation signal into the first baseband signal and transmit it to the communication control module, and convert the handshake modulation signal into a handshake signal and transmit it to the communication control module; The channel switching module is used to connect to the transmitting modulation module or the receiving demodulation module under the control of the communication control module; receive the handshake modulation signal or the first modulation signal sent by an external device, and send the handshake modulation signal or the first modulation signal to the receiving demodulation module; and is used to receive a second modulated signal sent by the transmit modulation module, and send the second modulated signal to an external device.

2. A radio frequency communication system according to claim 1, characterized in that: The communication control module is specifically configured to switch to the receiving state when receiving a handshake signal with a duration greater than a first preset duration.

3. The radio frequency communication system according to claim 1, wherein: The transmit modulation module is specifically configured to modulate a second baseband signal with a level of 0 into a second modulation signal with a first frequency, and to modulate a second baseband signal with a level of 1 into a second modulation signal with a second frequency.

4. The radio frequency communication system according to claim 1, wherein: The receiving demodulation module is specifically used to demodulate the first modulation signal of the first frequency into a first baseband signal with a level of 0, and to demodulate the first modulation signal of the second frequency into a first baseband signal with a level of 1.

5. A radio frequency communication system according to any one of claims 3 or 4, characterized in that: The first frequency is 590 KHz, and the second frequency is 710 KHz.

6. The radio frequency communication system according to claim 1, wherein: The transmit modulation module further includes a first gain adjustment circuit, and the first gain adjustment circuit is used to adjust the power of the second modulation signal to a first power range.

7. A radio frequency communication system according to claim 6, characterized in that: The first power range is -5dBm to -15dBm.

8. The radio frequency communication system according to claim 1, wherein: The receiving demodulation module includes a second gain adjustment circuit and a signal demodulation circuit; The input end of the second gain adjustment circuit is connected to the channel switching module, and the output end of the second gain adjustment circuit is connected to the input end of the signal demodulation circuit, and is used to receive the first modulation signal or the handshake modulation signal, adjust the power of the first modulation signal or the handshake modulation signal to a second power range, and then send the adjusted first modulation signal or the adjusted handshake modulation signal to the signal demodulation circuit; The output end of the signal demodulation circuit is connected to the communication control module, and is used to convert the adjusted first modulation signal into the first baseband signal and transmit it to the communication control module, and to convert the adjusted handshake modulation signal into the handshake signal and transmit the handshake signal to the communication control module.

9. A radio frequency communication system according to claim 8, characterized in that: The second gain adjustment circuit includes a power detection unit, an operational amplifier, an attenuator and an amplifier; The first end of the attenuator is connected to the channel switching module, and is used to receive the first modulation signal or the handshake modulation signal. The second end of the attenuator is connected to the output end of the operational amplifier, and is used to receive the control voltage signal output by the operational amplifier, and adjust the gain coefficient according to the control voltage signal; the output end of the attenuator is connected to the input end of the amplifier, and is used to adjust the power of the first modulation signal or the handshake modulation signal according to the gain coefficient, and output the power-adjusted first modulation signal or the power-adjusted handshake modulation signal to the amplifier; The output end of the amplifier is connected to the input end of the power detection unit and the input end of the signal demodulation circuit, and the amplifier is used to amplify the power-adjusted first modulation signal or the power-adjusted handshake modulation signal, and output the amplified first modulation signal or the amplified handshake modulation signal to the power detection unit and the signal demodulation circuit; The output end of the power detection unit is connected to the first input end of the operational amplifier, and is used to convert the power of the amplified first modulation signal or the power of the amplified handshake modulation signal into a first voltage signal, and transmit the first voltage signal to the first input end of the operational amplifier; The second input terminal of the operational amplifier is used to receive a reference voltage signal, and to compare the first voltage signal with the reference voltage signal and then output the control voltage signal to the attenuator.

10. A satellite communication device, characterized in that: A radio frequency communication system comprising any one of claims 1 to 9.

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