Satellite-borne link multiplexing multi-band radio frequency receiving measurement and control communication system and control method

Abstract

The present invention provides a satellite-borne link multiplexing multi-band radio frequency receiving measurement and control communication system and control method, which relates to the field of satellite data transmission communication technology, wherein the system includes a radio frequency board and a digital board, the digital board has a receiving processing unit, the radio frequency board includes a first frequency conversion selection unit and a second frequency conversion selection unit, the first frequency band signal is input into the receiving processing unit after being converted by the second down-conversion unit and the third frequency conversion signal of the first down-conversion unit, the second frequency band signal is converted by the first frequency conversion selection unit into a third frequency conversion signal and input into the receiving processing unit, and the third frequency band signal received by the first frequency conversion selection unit can also be input into the receiving processing unit via the first channel selection unit. The present invention realizes a system multi-band compatible reception and can also realize link multiplexing of down-conversion of frequency band signals, which can meet the design purpose of miniaturization and lightness of satellite-borne equipment to a great extent.

Description

Technical Field

[0001] The present invention relates to the field of satellite data transmission communication technology, and in particular to a satellite-borne link multiplexing multi-band radio frequency receiving measurement and control communication system. Background Art

[0002] At present, low-orbit remote sensing satellites at home and abroad mainly use Ka-band, X-band, and S-band frequency transmission signals. In the existing technology, single-band on-board processing equipment is mostly integrated for different frequency bands, which does not meet the design requirements of miniaturization and lightness of the equipment. Summary of the invention

[0003] The present invention is proposed to further improve the miniaturization and lightness of a satellite-borne link multiplexing multi-band radio frequency receiving measurement and control communication system, reduce the on-board mass and lower the receiving cost.

[0004] To achieve the above-mentioned purpose, the first aspect of the present invention provides a satellite-borne link multiplexing multi-band radio frequency receiving, measurement and control communication system, including a radio frequency board and a digital board, the digital board having a receiving processing unit, the radio frequency board including a first frequency conversion selection unit and a second frequency conversion selection unit, the first frequency conversion selection unit including a first channel selection unit and a first down-conversion unit, the second frequency conversion selection unit including a second channel selection unit and a second down-conversion unit, the first frequency band signal received by the second frequency conversion selection unit is down-converted into a second frequency band signal in the second down-conversion unit and then input into the first frequency conversion selection unit via the second channel selection unit, and is down-converted into a third frequency conversion signal in the first down-conversion unit and then input into the receiving processing unit via the first channel selection unit, the second frequency band signal received by the second frequency conversion selection unit is input into the first frequency conversion selection unit via the second channel selection unit, and is down-converted into a third frequency conversion signal in the first down-conversion unit and then input into the receiving processing unit via the first channel selection unit, the third frequency band signal received by the first frequency conversion selection unit can also be input into the receiving processing unit via the first channel selection unit.

[0005] In some embodiments, the first channel selection unit and the second channel selection unit both have an output end, a first input end and a second input end, wherein the first input end is a terminal that is communicatively connected to the first down-conversion unit or the second down-conversion unit.

[0006] In some embodiments,

[0007] The third frequency band signal is an S frequency band signal of 2-2.4 GHz;

[0008] The second frequency band signal is an X-band signal of 7-9 GHz;

[0009] The first frequency band signal is a Ka frequency band signal of 27-31 GHz.

[0010] In some embodiments, the first down-conversion unit includes:

[0011] A first high-pass filter, used for filtering the received signal in the second frequency band;

[0012] A first amplifier, used to amplify the second frequency band signal after being filtered by the first high-pass filter;

[0013] A first low-pass filter, used for filtering the second frequency band signal amplified by the first amplifier;

[0014] A first mixer, configured to down-convert the second frequency band signal into the third frequency band signal after mixing with a local oscillator signal;

[0015] A second low-pass filter, used for filtering the third frequency band signal formed by conversion;

[0016] A first digitally controlled attenuator, used for providing a dynamic range of 31 db for the filtered third frequency band signal;

[0017] A second amplifier, used to amplify the third frequency band signal by 25db;

[0018] A third amplifier, used to amplify the third frequency band signal by another 25db;

[0019] The bandpass filter is used to filter the amplified third frequency band signal.

[0020] In some embodiments,

[0021] The second amplifier has a bypass function and the insertion loss is 1.4 db when bypassed.

[0022] In some embodiments,

[0023] The third amplifier has a bypass function and the insertion loss is 1.4 db when bypassed.

[0024] In some embodiments, the second down-conversion unit includes:

[0025] A second high-pass filter, used for filtering the received signal in the first frequency band;

[0026] a fourth amplifier, used to amplify the first frequency band signal after filtering;

[0027] a fifth amplifier, configured to re-amplify the first frequency band signal amplified by the fourth amplifier;

[0028] A second mixer, configured to down-convert the first frequency band signal into the second frequency band signal after mixing with a local oscillator signal;

[0029] A second digitally controlled attenuator, used for providing a 45db dynamic range for the down-converted signal of the second frequency band;

[0030] a sixth amplifier, used to amplify the second frequency band signal;

[0031] The third low-pass filter is used to filter the second frequency band signal amplified by the sixth amplifier.

[0032] The second aspect of the present invention further provides a control method for the above-mentioned satellite-borne link multiplexing multi-band radio frequency receiving measurement and control communication system, comprising:

[0033] When the system receives a third frequency band signal, controlling the output end of the first channel selection unit to be connected to the second input end thereof;

[0034] When the system receives a second frequency band signal, the output end of the first channel selection unit is controlled to be connected to the first input end thereof, and the output end of the second channel selection unit is controlled to be connected to the second input end thereof;

[0035] When the system receives a first frequency band signal, the output end of the first channel selection unit is controlled to be connected to the first input end thereof, and the output end of the second channel selection unit is controlled to be connected to the first input end thereof.

[0036] Advantages of the present invention:

[0037] The receiving and processing unit of the digital board can receive the third frequency band signal from the ground station or inter-satellite communication, the second frequency band signal and the first frequency band signal processed or selected by the first frequency conversion selection unit and / or the second frequency conversion selection unit, thereby realizing multi-band compatible reception of a communication system. At the same time, it can also realize link multiplexing of frequency band signal down-conversion by controlling and switching the first channel selection unit and the second channel selection unit, which can meet the miniaturization and lightweight design purpose of satellite-borne equipment to a great extent, and reduce the volume and weight of satellite-borne equipment. It should be emphasized that due to the multiplexing of signal links in the present invention, the system of the present invention can realize the reception and processing of multiple different frequency band signals by using only one set of digital boards, without the need to separately match power supplies and processors for each frequency band signal, and avoid interactive control between different processors, which greatly simplifies the structure and control of satellite-borne equipment and reduces the volume and weight of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] The above and other objects, features and advantages of the present application will become more apparent by describing in detail the exemplary embodiments thereof with reference to the accompanying drawings. The accompanying drawings described below are only some embodiments of the present application, and it is clear to a person skilled in the art that other accompanying drawings can be obtained from these accompanying drawings without creative effort.

[0039] Figure 1 A schematic block diagram of a satellite-borne link multiplexing multi-band radio frequency receiving, measurement and control communication system according to an embodiment of the present invention is schematically shown;

[0040] Figure 2 Schematically shows Figure 1 A block diagram of the first down-conversion unit in FIG. 1 (including noise figure and link gain values);

[0041] Figure 3 Schematically shows Figure 1 A block diagram of the second down-conversion unit in FIG. 1 (including noise figure and link gain values);

[0042] Figure 4 The waveform simulation diagram shows that the first frequency band signal (i.e., Ka-band signal) received by the satellite-borne link multiplexing multi-band RF receiving, measurement and control communication system of the present invention is processed by the second down-conversion unit and the first down-conversion unit to form a third frequency band signal (i.e., S-band signal).

[0043] The reference numerals are:

[0044] 1. RF board; 11. first frequency conversion selection unit; 111. first channel selection unit; 112. first down-conversion unit; 1121. first high-pass filter; 1122. first amplifier; 1123. first low-pass filter; 1124. first mixer; 1125. second low-pass filter; 1126. first digitally controlled attenuator; 1127. second amplifier; 1128. third amplifier; 1129. band-pass filter; 113. second low-frequency connector; 12. Second frequency conversion selection unit; 121. Second channel selection unit; 122. Second down-conversion unit; 1221. Second high-pass filter; 1222. Fourth amplifier; 1223. Fifth amplifier; 1224. Second mixer; 1225. Second digitally controlled attenuator; 1226. Sixth amplifier; 1227. Third low-pass filter; 2. Digital board; 21. Receiving processing unit; 22. First low-frequency connector; 3. RF connecting line; 4. Low-frequency connecting line. DETAILED DESCRIPTION

[0045] Example embodiments will now be described more fully with reference to the accompanying drawings. However, example embodiments can be implemented in many forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this application will be comprehensive and complete and will fully convey the concepts of the example embodiments to those skilled in the art. The same reference numerals in the figures represent the same or similar parts, and thus their repeated description will be omitted.

[0046] In addition, described feature, structure or characteristic can be combined in one or more embodiments in any suitable manner. In the following description, many specific details are provided to provide a full understanding of the embodiments of the present application. However, those skilled in the art will appreciate that the technical scheme of the present application can be put into practice without one or more of the specific details, or other methods, components, devices, steps, etc. can be adopted. In other cases, known methods, devices, realizations or operations are not shown or described in detail to avoid blurring the various aspects of the application.

[0047] The block diagrams shown in the accompanying drawings are merely functional entities and do not necessarily correspond to physically independent entities. That is, these functional entities may be implemented in software form, or in one or more hardware modules or integrated circuits, or in different networks and / or processor devices and / or microcontroller devices.

[0048] The flowcharts shown in the accompanying drawings are only exemplary and do not necessarily include all the contents and operations / steps, nor must they be executed in the order described. For example, some operations / steps can be decomposed, and some operations / steps can be combined or partially combined, so the actual execution order may change according to actual conditions.

[0049] It should be understood that although the terms first, second, third, etc. may be used herein to describe various components, these components should not be limited by these terms. These terms are used to distinguish one component from another component. Therefore, the first component discussed below can be referred to as the second component without departing from the teachings of the concepts of the present application. As used herein, the term "and / or" includes any one of the associated listed items and all combinations of one or more.

[0050] Those skilled in the art will appreciate that the drawings are merely schematic diagrams of example embodiments, and the modules or processes in the drawings are not necessarily necessary for implementing the present application, and therefore cannot be used to limit the scope of protection of the present application.

[0051] According to an embodiment of the present invention, in combination with Figures 1 to 4As shown, the present invention provides a satellite-borne link multiplexing multi-band radio frequency receiving measurement and control communication system, including a radio frequency board 1 and a digital board 2 (i.e., a digital board FPGA, a field programmable gate array), wherein the digital board 2 has a receiving processing unit 21, and the radio frequency board 1 includes a first frequency conversion selection unit 11 and a second frequency conversion selection unit 12, wherein the first frequency conversion selection unit 11 includes a first channel selection unit 111 and a first down-conversion unit 112, and the second frequency conversion selection unit 12 includes a second channel selection unit 121 and a second down-conversion unit 122, and the first frequency band signal received by the second frequency conversion selection unit 12 is down-converted into a second frequency band signal in the second down-conversion unit 122 and then input into the first conversion unit 111 via the second channel selection unit 121. The first down-conversion unit 112 is used to down-convert the first frequency band signal into the third frequency band signal, and then the signal is input into the receiving processing unit 21 via the first channel selection unit 111. The second frequency band signal received by the second frequency conversion selection unit 12 is input into the first frequency conversion selection unit 11 via the second channel selection unit 121, and then the signal is down-converted into the third frequency band signal in the first down-conversion unit 112 and then input into the receiving processing unit 21 via the first channel selection unit 111. The third frequency band signal received by the first frequency conversion selection unit 11 can also be input into the receiving processing unit 21 via the first channel selection unit 111. The aforementioned down-conversion refers to the conversion of a signal with a lower frequency into a signal with a lower frequency. For details, see Figure 1 As shown, the first low-frequency connector 22 in the digital board 2 and the second low-frequency connector 113 in the first frequency conversion selection unit 11 are connected to each other through the low-frequency connection line 4, so as to realize the transmission of power and control signals from the digital board 2 to the radio frequency board 1. The down-conversion units and the channel selection units, the receiving processing unit 21 and the first channel selection unit 111, and the signal input end of each channel selection unit are all connected to each other through the radio frequency connection line 3.

[0052] In this technical solution, the receiving processing unit 21 of the digital board 2 can receive the third frequency band signal from the ground station or inter-satellite communication, the second frequency band signal and the first frequency band signal processed or selected by the first frequency conversion selection unit 11 and / or the second frequency conversion selection unit 12, thereby realizing multi-band compatible reception of a communication system. At the same time, it can also realize link multiplexing of down-conversion of frequency band signals by controlling and switching the first channel selection unit 111 and the second channel selection unit 121, which can greatly meet the design purpose of miniaturization and lightness of satellite-borne equipment and reduce the volume and weight of satellite-borne equipment. It should be emphasized that due to the multiplexing of signal links in the present invention, the system of the present invention can realize the reception and processing of multiple different frequency band signals by only using one set of digital boards 2, which greatly simplifies the structure of satellite-borne equipment and reduces the volume and weight of equipment.

[0053] It can be understood that after receiving the corresponding signal, the digital board 2 performs digital-to-analog conversion on the signal and demodulates the communication information.

[0054] In some implementations, the first channel selection unit 111 and the second channel selection unit 121 both have an output terminal, a first input terminal, and a second input terminal, wherein the first input terminal is an end that is communicatively connected to the first down-conversion unit 112 or the second down-conversion unit 122. Specifically, the first channel selection unit 111 and the second channel selection unit 121 can be implemented using single-pole double-throw switches, respectively.

[0055] In some embodiments, the third frequency band signal is an S frequency band signal of 2-2.4 GHz; the second frequency band signal is an X frequency band signal of 7-9 GHz; the first frequency band signal is a Ka frequency band signal of 27-31 GHz, so that the signal frequency band bandwidth that can be received by the present invention is 2 GHz and 4 GHz, that is, the input signal frequency band bandwidth that can be processed by the present invention is wider.

[0056] See Figure 2 As shown, in some embodiments, the first down-conversion unit 112 includes: a first high-pass filter 1121, used to filter the received second frequency band signal; a first amplifier 1122, used to amplify the second frequency band signal filtered by the first high-pass filter 1121; a first low-pass filter 1123, used to filter the second frequency band signal amplified by the first amplifier 1122; a first mixer 1124, used to down-convert the second frequency band signal into the third frequency band signal after mixing with the local oscillator signal; a second low-pass filter 1125, used to convert the formed The third frequency band signal is filtered; the first digitally controlled attenuator 1126 is used to provide a dynamic range of 31db for the filtered third frequency band signal; the second amplifier 1127 is used to amplify the third frequency band signal by 25db; the third amplifier 1128 is used to amplify the third frequency band signal by 25db again; the bandpass filter 1129 is used to filter the amplified third frequency band signal, the second amplifier 1127 has a bypass function and the insertion loss is 1.4db when bypassed; the third amplifier 1128 has a bypass function and the insertion loss is 1.4db when bypassed.

[0057] In this technical solution, the first down-conversion unit 112 performs high-pass filtering → amplification → low-pass filtering → mixing → low-pass filtering → digitally controlled attenuation → amplification → band-pass filtering on the second frequency band signal input therein in sequence, and then down-converts the input X-band signal into an S-band signal and inputs it into the subsequent receiving processing unit 21. The system has the effects of high gain, high dynamic and low spurious.

[0058] See also Figure 2 As shown, in a specific embodiment, the model of the first high-pass filter 1121 is HFCN672+, the model of the first amplifier 1122 is PMA-183PLN+, the model of the first low-pass filter 1123 is LFCN-9170+, the model of the first mixer 1124 is LTC5549, the model of the second low-pass filter 1125 is LFCG-4800+, the model of the first digitally controlled attenuator 1126 is HMC1119, and the model of the second amplifier 1124 is LTC5549. The model of the device 1127 is QPL9096, which has a bypass function and can amplify the S-band signal by 25db, with an insertion loss of 1.4db when bypassed; the model of the third amplifier 1128 is QPL9096, which has a bypass function and can amplify the S-band signal by 25db, with an insertion loss of 1.4db when bypassed; the model of the bandpass filter 1129 is BFCN-2275+, thereby meeting the design requirements of high gain, high dynamic and low spuriousness of the first down-conversion unit 112.

[0059] See Figure 3 As shown, in some embodiments, the second down-conversion unit 122 includes: a second high-pass filter 1221, used to filter the received first frequency band signal; a fourth amplifier 1222, used to amplify the filtered first frequency band signal; a fifth amplifier 1223, used to re-amplify the first frequency band signal amplified by the fourth amplifier 1222; a second mixer 1224, used to down-convert the first frequency band signal into the second frequency band signal after mixing with the local oscillator signal; a second digitally controlled attenuator 1225, used to provide a 45db dynamic range for the second frequency band signal formed by down-conversion; a sixth amplifier 1226, used to amplify the second frequency band signal; a third low-pass filter 1227, used to filter the second frequency band signal amplified by the sixth amplifier 1226.

[0060] In this technical solution, the received first frequency band signal is processed by the second down-conversion unit 122 in sequence through high-pass filtering → two-stage amplification → mixing → digitally controlled attenuation → amplification → low-pass filtering, and then the received Ka-band signal is converted into an X-band signal output, which has the effect of high gain, high dynamic and low spurious. It should be particularly noted that the aforementioned two-stage amplification processing of the first frequency band signal after high-pass filtering can significantly improve the gain and output power.

[0061] See Figure 3 As shown, in a specific embodiment, the model of the second high-pass filter 1221 is XHF2-153+, the model of the fourth amplifier 1222 is PMA3-34GLN+, the model of the fifth amplifier 1223 is PMA3-34GLN+, the model of the second mixer 1224 is HMC774ALC3B, the model of the second digitally controlled attenuator 1225 is HMC629A, the model of the sixth amplifier 1226 is PMA-183PLN+, and the model of the third low-pass filter 1227 is LFCN-9170+, thereby meeting the design requirements of high gain, high dynamic and low spurious of the first down-conversion unit 112.

[0062] Specifically, due to the use of the component design of the aforementioned down-conversion units, the maximum gain of the XS frequency conversion link (i.e., the aforementioned first down-conversion unit 112) is 41.45dB, the maximum gain of the Ka-X frequency conversion link (i.e., the aforementioned second down-conversion unit 122) is 60.45Db, and the maximum gain of the total link is 101.9dB, that is, a high gain of the link is achieved; the Ka-X frequency conversion link has a 45db dynamic range provided by the digitally controlled attenuator (i.e., the aforementioned second digitally controlled attenuator 1225), and the XS frequency conversion link has a digitally controlled attenuator (i.e., the aforementioned second down-conversion unit 1225). That is, the 31db dynamic range provided by the aforementioned first digitally controlled attenuator 1126) and the amplifiers with bypass function (that is, the aforementioned second amplifier 1127 and the third amplifier 1128) each provide a dynamic range of 26.4db, totaling 52.8db, totaling a dynamic range of 128.8db, which means that the high dynamic of the system is achieved; due to the use of an active mixer, the spurious caused by excessive driving power is reduced, and filters are used for filtering of the input, output and after amplification, which reduces the link spurious, and thus achieves a low spurious design of the system.

[0063] See also Figure 4 As shown, the waveform simulation diagram of the third frequency band signal (i.e., S frequency band signal) formed by the first frequency band signal (i.e., Ka frequency band signal) being processed by the second down-conversion unit 122 and the first down-conversion unit 112 in sequence, at the offset bandwidth of 100Hz to 100MHz, the phase noise is less than -100dbc / Hz, and the RF indicators are good, meeting the design expectations.

[0064] It is understandable that, see Figures 2 to 4 As shown, the components in each down-conversion unit are electrically connected according to the order of signal processing.

[0065] The following combination Figure 1 The system working process and signal link selection of the present invention are further described:

[0066] (1) When receiving an S-band signal, the digital board 2 controls the output end of the first channel selection unit 111 to be connected to its second input end, and the S-band signal received by the RFin-S connector enters the receiving processing unit 21 for processing;

[0067] (2) When receiving an X-band signal, the X-band signal enters the second input end of the second channel selection unit 121 through a port (i.e., an RFin-X connector), and the digital board 2 controls the second input end of the second channel selection unit 121 to be connected to its output end. After passing through the first down-conversion unit 112, the X-band signal is converted into an S-band signal, and the digital board 2 controls the first input end of the first channel selection unit 111 to be connected to its output end, and then enters the receiving processing unit 21 for processing;

[0068] (3) When receiving a Ka-band signal, the Ka-band signal enters the second down-conversion unit 122 through a port (i.e., the RFin-Ka connector), is converted into an X-band signal after processing, and then enters the first input end of the second channel selection unit 121. The digital board 2 controls the first input end of the second channel selection unit 121 to be connected with its output end; the X-band signal enters the first down-conversion unit 112, is converted into an S-band signal after processing, and enters the first input end of the first channel selection unit 111. The digital board 2 controls the first input end of the first channel selection unit 111 to be connected with its output end. The S-band signal processed by the first down-conversion unit 112 enters the receiving processing unit 21 of the digital board 2 for processing.

[0069] That is, according to an embodiment of the present invention, there is also provided a control method for the above-mentioned satellite-borne link multiplexing multi-band radio frequency receiving measurement and control communication system, comprising:

[0070] When the system receives a third frequency band signal, the output end of the first channel selection unit 111 is controlled to be connected to the second input end thereof;

[0071] When the system receives a second frequency band signal, the output end of the first channel selection unit 111 is controlled to be connected to the first input end thereof, and the output end of the second channel selection unit 121 is controlled to be connected to the second input end thereof;

[0072] When the system receives a first frequency band signal, the output end of the first channel selection unit 111 is controlled to be connected to the first input end thereof, and the output end of the second channel selection unit 121 is controlled to be connected to the first input end thereof.

[0073] In particular, the local oscillator signal of the first down-conversion unit 112 of the system is provided by TI's phase-locked loop chip LMX2594, and the local oscillator signal of the second down-conversion unit 122 is provided by TI's phase-locked loop chip LMX2594 after frequency doubling. Since it is not the focus of the present invention, it will not be described in detail herein.

[0074] In summary, this device and system can process Ka, X, and S multi-band signals. When used as a satellite-borne product, it can effectively reduce the volume and mass of the device and the complexity of the overall system.

[0075] Through the description of the above embodiments, those skilled in the art can easily understand that the exemplary embodiments described here can be implemented by combining software with hardware.

[0076] The exemplary embodiments of the present invention are specifically shown and described above. It should be understood that the present invention is not limited to the detailed structure, configuration or implementation method described herein; on the contrary, the present invention is intended to cover various modifications and equivalent configurations included in the spirit and scope of the appended claims.

Claims

1. A satellite-borne link multiplexing multi-band radio frequency receiving, measurement and control communication system, comprising a radio frequency board (1) and a digital board (2), characterized in that: The digital board (2) has a receiving processing unit (21). The radio frequency board (1) includes a first frequency conversion selection unit (11) and a second frequency conversion selection unit (12). The first frequency conversion selection unit (11) includes a first channel selection unit (111) and a first down-conversion unit (112). The second frequency conversion selection unit (12) includes a second channel selection unit (121) and a second down-conversion unit (122). A first frequency band signal received by the second frequency conversion selection unit (12) is down-converted into a second frequency band signal in the second down-conversion unit (122) and then input into the first frequency conversion selection unit (11) via the second channel selection unit (121). The first frequency band signal received by the second frequency conversion selection unit (12) is down-converted into a second frequency band signal in the second down-conversion unit (122) and then input into the first frequency conversion selection unit (11) via the second channel selection unit (121). The second frequency band signal received by the second frequency conversion selection unit (12) is down-converted into a third frequency band signal in the first down-conversion unit (112) and then input into the receiving processing unit (21) via the first channel selection unit (111). The second channel selection unit (121) inputs the first frequency conversion selection unit (11), and after being down-converted into a third frequency conversion signal in the first down-conversion unit (112), the signal is input into the receiving processing unit (21) via the first channel selection unit (111); the third frequency band signal received by the first frequency conversion selection unit (11) can also be input into the receiving processing unit (21) via the first channel selection unit (111); the first channel selection unit (111) and the second channel selection unit (121) both have an output end, a first input end and a second input end, wherein the first input end is an end connected to the first down-conversion unit (112) or the second down-conversion unit (122) for communication; the third frequency band signal is an S frequency band signal of 2-2.4 GHz; the second frequency band signal is an X frequency band signal of 7-9 GHz; and the first frequency band signal is a Ka frequency band signal of 27-31 GHz.

2. The satellite-borne link multiplexing multi-band radio frequency receiving measurement and control communication system according to claim 1 is characterized in that: The first down-conversion unit (112) comprises: A first high-pass filter (1121), configured to filter the received signal in the second frequency band; A first amplifier (1122), used for amplifying the second frequency band signal filtered by the first high-pass filter (1121); A first low-pass filter (1123), used for filtering the second frequency band signal amplified by the first amplifier (1122); A first mixer (1124), configured to down-convert the second frequency band signal into the third frequency band signal after mixing with the local oscillator signal; A second low-pass filter (1125), configured to filter the third frequency band signal formed by conversion; A first digitally controlled attenuator (1126), used for providing a dynamic range of 31 db for the filtered third frequency band signal; A second amplifier (1127), used for amplifying the third frequency band signal by 25db; A third amplifier (1128), used for amplifying the third frequency band signal by another 25db; A bandpass filter (1129) is used to filter the amplified third frequency band signal.

3. The satellite-borne link multiplexing multi-band radio frequency receiving measurement and control communication system according to claim 2 is characterized in that: The second amplifier (1127) has a bypass function and the insertion loss is 1.4 db when bypassed.

4. The satellite-borne link multiplexing multi-band radio frequency receiving measurement and control communication system according to claim 3 is characterized in that: The third amplifier (1128) has a bypass function and the insertion loss is 1.4 db when bypassed.

5. The satellite-borne link multiplexing multi-band radio frequency receiving measurement and control communication system according to any one of claims 1 to 4, characterized in that: The second down-conversion unit (122) comprises: A second high-pass filter (1221), configured to filter the received signal in the first frequency band; a fourth amplifier (1222), configured to amplify the first frequency band signal after filtering; a fifth amplifier (1223), configured to re-amplify the first frequency band signal amplified by the fourth amplifier (1222); A second mixer (1224), configured to down-convert the first frequency band signal into the second frequency band signal after mixing with the local oscillator signal; A second digitally controlled attenuator (1225), used for providing a 45db dynamic range for the down-converted second frequency band signal; a sixth amplifier (1226), configured to amplify the second frequency band signal; The third low-pass filter (1227) is used to filter the second frequency band signal amplified by the sixth amplifier (1226).

6. A control method for a satellite-borne link multiplexing multi-band radio frequency receiving, measurement and control communication system according to any one of claims 1 to 5, characterized in that: include: When the system receives a third frequency band signal, controlling the output end of the first channel selection unit (111) to be connected to the second input end thereof; When the system receives a second frequency band signal, the output end of the first channel selection unit (111) is controlled to be connected to the first input end thereof, and the output end of the second channel selection unit (121) is controlled to be connected to the second input end thereof; When the system receives a first frequency band signal, the output end of the first channel selection unit (111) is controlled to be connected to the first input end thereof, and the output end of the second channel selection unit (121) is controlled to be connected to the first input end thereof.

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