A C / Ka dual-band multiplexing receiving system

Abstract

This invention provides a C / Ka dual-band multiplexed receiving system, including an antenna feed module, a radio frequency front-end module, a switching switch, a frequency conversion module, and a baseband processing module. The antenna feed module receives C-band and Ka-band radio frequency signals. The radio frequency front-end module includes a C-band radio frequency processing unit and a Ka-band radio frequency processing unit. The output of the switching switch is connected to the input of the frequency conversion module. The frequency conversion module performs frequency conversion on the C / Ka-band intermediate frequency signals output by the switching switch. The input and output of the frequency conversion module are connected to the input and output of the baseband processing module. This invention achieves miniaturized and highly reliable dual-band reception by down-converting Ka-band signals to C-band to reuse C-band links, modular redundancy backup, and a full-link self-test design.

Description

Technical Field

[0001] This invention belongs to the field of satellite communication receiving technology, specifically relating to a C / Ka dual-band multiplexing receiving system. Background Technology

[0002] In fields such as satellite communication, airship communication, and radar, the C-band has advantages in strong penetration and anti-interference capabilities, while the Ka-band meets the requirements of high-speed data transmission with its high bandwidth characteristics. Combining the two is the mainstream solution that balances transmission reliability and capacity. However, the design concept and engineering implementation of traditional dual-band receiving systems still have many technical pain points that urgently need to be solved.

[0003] In existing technologies, such as the "A Starlink Low-Earth Orbit Satellite Signal Multi-Band Fusion Navigation System" (publication number CN202410410639.0), although the reception and fusion processing of multi-band signals are achieved, the dual-band hardware architecture design still follows the traditional discrete approach, configuring independent RF front-ends, down-conversion units, and intermediate frequency processing links for the C-band and Ka-band respectively. This design results in extremely high hardware redundancy, which not only makes the equipment bulky and heavy, significantly increasing the payload burden in scenarios such as aerospace equipment, but also increases system cost and power consumption due to the large number of components. In addition, existing equipment often adopts single-point links in reliability design, lacking effective redundancy backup mechanisms, which can easily lead to service interruption in the event of a failure, and lacks convenient end-to-end self-testing methods.

[0004] In summary, although existing technologies reduce size through dual-band antenna common aperture design, they do not solve the redundancy problem of RF and IF links, still require two independent processing hardware, and cannot meet the requirements of miniaturization and low cost. Summary of the Invention

[0005] The purpose of this invention is to provide a C / Ka dual-band multiplexing receiving system, which achieves miniaturized and highly reliable dual-band reception by downconverting the Ka band signal to the C band to reuse the C band link, modular redundancy backup, and full-link self-test design.

[0006] To achieve the above objectives, the technical solution of the present invention is as follows: A C / Ka dual-band multiplexing receiver system includes an antenna feed module, an RF front-end module, a switching switch, a frequency conversion module, and a baseband processing module; The antenna feed module is used to receive C-band RF signals and Ka-band RF signals, and the output terminal of the antenna feed module is connected to the input terminal of the RF front-end module. The RF front-end module includes a C-band RF processing unit and a Ka-band RF processing unit. The C-band RF processing unit processes the C-band RF signal into a C-band intermediate frequency signal. The Ka-band RF processing unit includes a Ka-band low-noise amplifier unit and a Ka down-conversion unit. The output of the Ka-band low-noise amplifier unit is connected to the input of the Ka down-conversion unit, and it processes the Ka-band RF signal into a Ka / C-band intermediate frequency signal. The outputs of the C-band RF processing unit and the Ka down-conversion unit are connected to the input of a switching switch. The output terminal of the switching switch is connected to the input terminal of the frequency conversion module; the frequency conversion module is used to perform frequency conversion on the C / Ka band intermediate frequency signal output by the switching switch, and the input and output of the frequency conversion module are connected to the input and output terminals of the baseband processing module.

[0007] Furthermore, the C-band radio frequency processing unit includes a first C-band low noise amplifier, a second C-band low noise amplifier, a first filter splitter, and a second filter splitter; The input terminal of the first C-band low-noise amplifier is connected to the CL polarization signal output terminal of the antenna feed module, and its output terminal is connected to the input terminal of the first filter splitter. The input terminal of the second C-band low-noise amplifier is connected to the CR polarization signal output terminal of the antenna feed module, and its output terminal is connected to the input terminal of the second filter splitter. Both the first C-band low-noise amplifier and the second C-band low-noise amplifier are composed of a first isolator, a coupler, a multi-stage low-noise amplifier, and a second isolator connected in series. The first and second filter splitters each output two intermediate frequency signals: one for data transmission and one for telemetry. The output terminals of both the first and second filter splitters are connected to the input terminal of a switching switch.

[0008] Furthermore, the Ka-band low-noise amplifier unit includes at least four Ka-band low-noise amplifiers, namely a first Ka-band low-noise amplifier, a second Ka-band low-noise amplifier, a third Ka-band low-noise amplifier, and a fourth Ka-band low-noise amplifier; the Ka down-conversion unit includes at least a Ka / C telemetry down-converter and a Ka / C data transmission down-converter. The input terminal of the first Ka-band low-noise amplifier is connected to the KaL-polarized telemetry signal output terminal of the antenna feed module, and the input terminal of the second Ka-band low-noise amplifier is connected to the KaR-polarized telemetry signal output terminal of the antenna feed module. The output terminals of the first Ka-band low-noise amplifier and the second Ka-band low-noise amplifier are connected to the input terminal of the Ka / C telemetry down-converter. The output terminal of the Ka / C telemetry down-converter is connected to the input terminal of the switching switch, and is used to output two intermediate frequency signals to the switching switch. The input terminal of the third Ka-band low-noise amplifier is connected to the KaL polarized data transmission signal output terminal of the antenna feed module, and the input terminal of the fourth Ka-band low-noise amplifier is connected to the KaR polarized data transmission signal output terminal of the antenna feed module. The output terminals of the third Ka-band low-noise amplifier and the fourth Ka-band low-noise amplifier are connected to the input terminal of the Ka / C data transmission down-converter. The output terminal of the Ka / C data transmission down-converter is connected to the input terminal of the switching switch, which is used to output two intermediate frequency signals to the switching switch.

[0009] Furthermore, the first Ka-band low-noise amplifier, the second Ka-band low-noise amplifier, the third Ka-band low-noise amplifier, and the fourth Ka-band low-noise amplifier are all composed of three stages of low-noise amplifiers and two stages of attenuators connected in series, with the two stages of attenuators respectively disposed between two adjacent stages of low-noise amplifiers.

[0010] Furthermore, the input terminal of the switching switch receives multiple intermediate frequency signals; its output terminal is routed to the corresponding processing unit of the frequency converter module according to the signal type.

[0011] Furthermore, the frequency conversion module includes a telemetry down-converter, a data transmission processing down-converter, and a matrix switch; The input terminal of the telemetry downconverter is connected to the telemetry signal output terminal of the switching switch, which is used to convert the analog telemetry signal into a digital telemetry signal, and its output terminal is connected to the matrix switch. The input terminal of the data transmission down-converter is connected to the data transmission signal output terminal of the switching switch, which is used to convert the analog data transmission signal into a digital telemetry signal, and its output terminal is connected to the matrix switch. The input and output terminals of the matrix switch are connected to the input and output terminals of the baseband processing module.

[0012] Furthermore, the baseband processing module includes a measurement and control baseband and a data transmission baseband; The measurement and control baseband is used to receive digital telemetry signals output by the frequency converter module and output telemetry analog test signals; The data transmission baseband is used to receive the digital data transmission signal output by the frequency converter module and output the data transmission analog test signal.

[0013] Furthermore, the frequency conversion module also includes the analog processing unit, which includes a first analog up-conversion module and a second analog up-conversion module; The input terminal of the first analog upconversion module is connected to the output terminal of the matrix switch, and is used to receive the telemetry analog test signal transmitted back from the measurement and control baseband, and convert it into a telemetry analog intermediate frequency test signal; The input terminal of the second analog upconversion module is connected to the output terminal of the matrix switch and the output terminal of the first analog upconversion module, respectively, and is used to receive the data transmission analog test signal returned by the data transmission baseband and the telemetry analog intermediate frequency test signal output by the first analog upconversion module, and convert them into a unified analog intermediate frequency test signal; the output terminal of the second analog upconversion module is connected to the input terminal of the switching switch.

[0014] Furthermore, the radio frequency front-end module also includes an up-converter and a splitter; The input terminal of the splitter is connected to the analog intermediate frequency test signal output terminal of the switching switch, and its output terminal is connected to the input terminal of the C-band radio frequency processing unit. The input terminal of the upconverter is connected to the analog intermediate frequency test signal output terminal of the switching switch, and its output terminal is connected to the input terminal of the Ka-band radio frequency processing unit.

[0015] Furthermore, it also includes a clock generation unit, which includes a time-frequency device and a time-frequency generation splitter. The output of the time-frequency device is connected to the input of the time-frequency generation splitter, and the output of the time-frequency generation splitter is connected to the radio frequency front-end module and the frequency conversion module, respectively.

[0016] This invention can downconvert Ka-band data transmission radio frequency signals to 1.5GHz intermediate frequency signals of the same specifications as C-band data transmission signals using a Ka / C downconverter. This ensures that the intermediate frequency signals after Ka-band conversion can share the subsequent processing links with the C-band intermediate frequency signals, effectively reducing the number of hardware components, lowering the size and cost of equipment, and meeting the aerospace industry's demand for miniaturized and low-cost dual-band receiving systems. Attached Figure Description

[0017] Figure 1 This is a block diagram of the overall architecture of the C / Ka dual-band multiplexing receiving system in an embodiment of the present invention; Figure 2 This is a schematic diagram of the C-band low-noise amplifier structure in an embodiment of the present invention; Figure 3 This is a schematic diagram of the Ka-band low-noise amplifier structure in an embodiment of the present invention. Detailed Implementation

[0018] The present invention will be further described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The terms such as "upper," "lower," "left," and "right" used in this specification are only for the convenience of description and are not intended to limit the scope of the present invention. Changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered as within the scope of the present invention.

[0019] This invention provides a C / Ka dual-band multiplexing receiver system, such as... Figure 1 As shown, it includes an antenna feed module, an RF front-end module, a switching switch, a frequency conversion module, a baseband processing module, and a clock generation unit.

[0020] The antenna feed module is used to receive C-band and Ka-band radio frequency signals, and outputs the received radio frequency signals to the radio frequency front-end module in a directional manner according to the frequency band and polarization.

[0021] Specifically, the antenna feed module can receive radio frequency signals with four polarization modes: C-band left-hand (CL), C-band right-hand (CR), Ka-band left-hand (KaL), and Ka-band right-hand (KaR), and then output the radio frequency signals with different polarization modes and different frequency bands to the corresponding radio frequency front-end modules.

[0022] The radio frequency front-end module includes a C-band radio frequency processing unit and a Ka-band radio frequency processing unit. The C-band radio frequency processing unit is used to perform low-noise amplification and filtering of the C-band signal and output the C-band intermediate frequency signal. The Ka-band radio frequency processing unit is used to perform low-noise amplification of the Ka-band signal and down-convert the Ka-band radio frequency signal to a Ka / C-band intermediate frequency signal, which is then multiplexed with the C-band intermediate frequency signal in subsequent switching switches, frequency conversion modules, and baseband processing modules to achieve hardware link reuse and reduce the number of layout equipment components.

[0023] Specifically, the C-band radio frequency processing unit includes a first C-band low noise amplifier, a second C-band low noise amplifier, a first filter splitter, and a second filter splitter.

[0024] The input terminal of the first C-band low-noise amplifier is connected to the CL polarization signal output terminal of the antenna feed module, and its output terminal is connected to the input terminal of the first filter splitter. The input terminal of the second C-band low-noise amplifier is connected to the CR polarization signal output terminal of the antenna feed module, and its output terminal is connected to the input terminal of the second filter splitter. like Figure 2 As shown, both the first and second C-band low-noise amplifiers consist of a first isolator, a coupler, a multi-stage low-noise amplifier, and a second isolator connected in series. The first and second isolators isolate interference between preceding and following stages. The coupler extracts a portion of the C-band RF signal to provide a signal source for subsequent channel self-testing. The multi-stage low-noise amplifier optimizes the noise figure using a field-effect transistor matching circuit; in this embodiment, the channel noise figure is designed to be 0.77 dB.

[0025] The first filter splitter outputs two intermediate frequency signals, C data transmission A and C telemetry A, and the second filter splitter outputs two intermediate frequency signals, C data transmission B and C telemetry B; the output terminals of both the first and second filter splitters are connected to the input terminals of the switching switch.

[0026] The Ka-band RF processing unit includes a Ka-band low-noise amplifier subunit and a Ka-band down-conversion subunit. The Ka-band low-noise amplifier subunit includes at least four Ka-band low-noise amplifiers: a first Ka-band low-noise amplifier, a second Ka-band low-noise amplifier, a third Ka-band low-noise amplifier, and a fourth Ka-band low-noise amplifier. The Ka-band down-conversion subunit includes at least four Ka / C down-converters: a first Ka / C telemetry down-converter, a second Ka / C telemetry down-converter, a first Ka / C data transmission down-converter, and a second Ka / C data transmission down-converter.

[0027] Specifically, the input terminal of the first Ka-band low-noise amplifier is connected to the KaL-polarized telemetry signal output terminal of the antenna feed module; the input terminal of the second Ka-band low-noise amplifier is connected to the KaR-polarized telemetry signal output terminal of the antenna feed module; the input terminal of the third Ka-band low-noise amplifier is connected to the KaL-polarized data transmission signal output terminal of the antenna feed module; and the input terminal of the fourth Ka-band low-noise amplifier is connected to the KaR-polarized data transmission signal output terminal of the antenna feed module.

[0028] like Figure 3 As shown, the first Ka-band low-noise amplifier, the second Ka-band low-noise amplifier, the third Ka-band low-noise amplifier, and the fourth Ka-band low-noise amplifier are all composed of three stages of low-noise amplifiers and two stages of attenuators connected in series. The two stages of attenuators are respectively set between two adjacent stages of low-noise amplifiers to improve the interstage standing wave ratio and ensure the stability of gain fluctuations during signal amplification.

[0029] The output terminals of the first Ka-band low-noise amplifier and the second Ka-band low-noise amplifier are connected to the input terminals of the Ka / C telemetry downconverter. The output terminal of the Ka / C telemetry downconverter is connected to the input terminal of the switching switch, which is used to output two intermediate frequency signals, Ka / C telemetry A and Ka / C telemetry B, to the switching switch.

[0030] The output terminals of the third Ka-band low-noise amplifier and the fourth Ka-band low-noise amplifier are connected to the input terminals of the Ka / C data transmission down-converter. The output terminal of the Ka / C data transmission down-converter is connected to the input terminal of the switching switch, and is used to output two intermediate frequency signals, Ka / C data transmission A and Ka / C data transmission B, to the switching switch.

[0031] The Ka / C telemetry downconverter downconverts the Ka-band telemetry radio frequency signal to a 70MHz intermediate frequency signal of the same specification as the C-band telemetry signal; the Ka / C data transmission downconverter downconverts the Ka-band data transmission radio frequency signal to a 1.5GHz intermediate frequency signal of the same specification as the C-band data transmission signal, ensuring that the intermediate frequency signal after Ka-band conversion can share the subsequent processing link with the C-band intermediate frequency signal.

[0032] To ensure continuous reception of Ka-band telemetry and data transmission signals, the first, second, third, and fourth Ka-band low-noise amplifiers are all designed with 1:1 hot backup, forming primary and backup links. Switches are installed before the primary and backup links to switch between them. When the primary low-noise amplifier link fails, the system can quickly switch to the backup link by switching the corresponding switch.

[0033] The output terminals of the C-band RF processing unit and the Ka downconversion unit are connected to the input terminal of the switching switch, and the output terminal of the switching switch is connected to the input terminal of the frequency conversion module.

[0034] The input terminal of the switching switch receives a total of 8 intermediate frequency signals: C data transmission A, C data transmission B, C telemetry A, C telemetry B, Ka / C data transmission A, Ka / C data transmission B, Ka / C telemetry A, and Ka / C telemetry B; its output terminal outputs signals to the corresponding processing unit of the frequency converter module according to the signal type.

[0035] The frequency conversion module is used to perform analog-to-digital conversion on the eight intermediate frequency signals output by the switching switch, and the input and output terminals of the frequency conversion module are connected to the input and output terminals of the baseband processing module.

[0036] Specifically, the frequency conversion module includes a telemetry downconverter, a data transmission downconverter, and a matrix switch.

[0037] The input terminal of the telemetry downconverter is connected to the signal output terminals of the switching switch, namely C telemetry A, Ka / C telemetry A, C telemetry B, and Ka / C telemetry B, which are used to convert the analog telemetry intermediate frequency signal into a digital telemetry signal. Its output terminal is connected to a matrix switch. The input terminal of the data transmission down-converter is connected to the signal output terminals of the switching switch, namely C data transmission A, Ka / C data transmission A, C data transmission B, and Ka / C data transmission B, which are used to convert the analog data transmission intermediate frequency signal into a digital data transmission signal. Its output terminal is connected to a matrix switch. The output of the matrix switch is connected to the input of the baseband processing module, and the received digital telemetry signals and digital data transmission signals are distributed to the corresponding processing units of the baseband processing module.

[0038] The baseband processing module includes a measurement and control baseband and a data transmission baseband.

[0039] The measurement and control baseband is used to receive digital telemetry signals output by the frequency converter module, complete signal demodulation and decoding, output azimuth and elevation error voltage signals to the servo system, drive the antenna to move in the direction of reducing error, realize automatic tracking of the target, and output telemetry analog test signals to the frequency converter module.

[0040] The data transmission baseband is used to receive the digital data transmission signal output by the frequency converter module, complete data demodulation and bit synchronization, and output the data transmission analog test signal to the frequency converter module.

[0041] Furthermore, to achieve end-to-end self-testing of the entire receiving channel, the frequency conversion module also includes an analog processing unit. The output of the baseband processing module is connected to the input of the matrix switch. The matrix switch outputs telemetry analog test signals and data transmission analog test signals to the analog processing unit. The analog processing unit includes a first analog up-conversion module and a second analog up-conversion module.

[0042] The input terminal of the first analog upconversion module is connected to the output terminal of the matrix switch, and is used to receive the telemetry analog test signal transmitted back from the measurement and control baseband, and convert it into a telemetry analog intermediate frequency test signal; The input terminals of the second analog upconversion module are connected to the output terminals of the matrix switch and the first analog upconversion module, respectively. It receives the analog test signal from the data transmission baseband and the telemetry analog intermediate frequency (IF) test signal output by the first analog upconversion module, and converts them into a unified analog IF test signal. The output terminal of the second analog upconversion module is connected to the input terminal of the switching switch, transmitting the analog IF test signal back to the RF front-end module to complete the end-to-end self-test. The first analog upconversion module is used to upconvert the 70 MHz telemetry analog test signal to the L-band frequency, and the first analog upconversion module is used to upconvert the L-band to the C-band.

[0043] The radio frequency front-end module also includes an upconverter and a splitter: The input terminal of the splitter is connected to the analog intermediate frequency test signal output terminal of the switching switch, and its output terminal is connected to the input terminals of the first C-band low noise amplifier and the second C-band low noise amplifier, respectively. The input terminal of the upconverter is connected to the analog intermediate frequency test signal output terminal of the switching switch, and its output terminal is connected to the input terminals of the first Ka-band low noise amplifier, the second Ka-band low noise amplifier, the third Ka-band low noise amplifier, and the fourth Ka-band low noise amplifier, respectively.

[0044] The clock generation unit includes a time-frequency device and a time-frequency generation splitter. The output of the time-frequency device is connected to the input of the time-frequency generation splitter. The output of the time-frequency generation splitter is connected to the Ka / C telemetry downconverter and Ka / C data transmission downconverter of the RF front-end module, as well as the telemetry downconverter, data transmission downconverter, first analog upconverter module, and second analog upconverter module of the frequency conversion module. In this embodiment, the clock generation unit is used to provide a 100MHz unified clock reference to achieve end-to-end frequency synchronization.

[0045] This invention can simultaneously receive two downlink telemetry channels and two downlink data transmission channels of Ka-band and C-band signals, supporting two channels in the same rotation direction or one channel in different rotation directions. It also features a backup design, enabling seamless switching in case of failure and ensuring service continuity. The Ka-band signal can be downconverted to the C-band via a Ka / C downconverter, and the intermediate frequency processing and baseband link of the C-band can be reused, reducing the number of hardware components and lowering the size and cost of the equipment, thus achieving the goals of system miniaturization and low cost.

[0046] The above description is only a preferred embodiment of the present invention. Therefore, all equivalent changes or modifications made to the structure, features and principles described in the claims of this patent application are included within the scope of protection of this patent application.

Claims

1. A C / Ka dual-band multiplexing receiving system, characterized in that, Includes antenna feed module, RF front-end module, switching switch, frequency conversion module and baseband processing module; The antenna feed module is used to receive C-band RF signals and Ka-band RF signals, and the output terminal of the antenna feed module is connected to the input terminal of the RF front-end module. The RF front-end module includes a C-band RF processing unit and a Ka-band RF processing unit. The C-band RF processing unit processes the C-band RF signal into a C-band intermediate frequency signal. The Ka-band RF processing unit includes a Ka-band low-noise amplifier unit and a Ka down-conversion unit. The output of the Ka-band low-noise amplifier unit is connected to the input of the Ka down-conversion unit, and it processes the Ka-band RF signal into a Ka / C-band intermediate frequency signal. The outputs of the C-band RF processing unit and the Ka down-conversion unit are connected to the input of a switching switch. The output terminal of the switching switch is connected to the input terminal of the frequency conversion module; the frequency conversion module is used to perform frequency conversion on the C / Ka band intermediate frequency signal output by the switching switch, and the input and output of the frequency conversion module are connected to the input and output terminals of the baseband processing module.

2. The C / Ka dual-band multiplexing receiving system according to claim 1, characterized in that, The C-band radio frequency processing unit includes a first C-band low noise amplifier, a second C-band low noise amplifier, a first filter splitter, and a second filter splitter; The input terminal of the first C-band low-noise amplifier is connected to the CL polarization signal output terminal of the antenna feed module, and its output terminal is connected to the input terminal of the first filter splitter. The input terminal of the second C-band low-noise amplifier is connected to the CR polarization signal output terminal of the antenna feed module, and its output terminal is connected to the input terminal of the second filter splitter. Both the first C-band low-noise amplifier and the second C-band low-noise amplifier are composed of a first isolator, a coupler, a multi-stage low-noise amplifier, and a second isolator connected in series. The first and second filter splitters each output two intermediate frequency signals: one for data transmission and one for telemetry. The output terminals of both the first and second filter splitters are connected to the input terminal of a switching switch.

3. The C / Ka dual-band multiplexing receiving system according to claim 1, characterized in that, The Ka-band low-noise amplifier unit includes at least four Ka-band low-noise amplifiers, namely a first Ka-band low-noise amplifier, a second Ka-band low-noise amplifier, a third Ka-band low-noise amplifier, and a fourth Ka-band low-noise amplifier; the Ka down-conversion unit includes at least a Ka / C telemetry down-converter and a Ka / C data transmission down-converter. The input terminal of the first Ka-band low-noise amplifier is connected to the KaL-polarized telemetry signal output terminal of the antenna feed module, and the input terminal of the second Ka-band low-noise amplifier is connected to the KaR-polarized telemetry signal output terminal of the antenna feed module. The output terminals of the first Ka-band low-noise amplifier and the second Ka-band low-noise amplifier are connected to the input terminal of the Ka / C telemetry down-converter. The output terminal of the Ka / C telemetry down-converter is connected to the input terminal of the switching switch, and is used to output two intermediate frequency signals to the switching switch. The input terminal of the third Ka-band low-noise amplifier is connected to the KaL polarized data transmission signal output terminal of the antenna feed module, and the input terminal of the fourth Ka-band low-noise amplifier is connected to the KaR polarized data transmission signal output terminal of the antenna feed module. The output terminals of the third Ka-band low-noise amplifier and the fourth Ka-band low-noise amplifier are connected to the input terminal of the Ka / C data transmission down-converter. The output terminal of the Ka / C data transmission down-converter is connected to the input terminal of the switching switch, which is used to output two intermediate frequency signals to the switching switch.

4. A C / Ka dual-band multiplexing receiving system according to claim 3, characterized in that, The first Ka-band low-noise amplifier, the second Ka-band low-noise amplifier, the third Ka-band low-noise amplifier, and the fourth Ka-band low-noise amplifier are all composed of three stages of low-noise amplifiers and two stages of attenuators connected in series, with the two stages of attenuators respectively located between two adjacent stages of low-noise amplifiers.

5. A C / Ka dual-band multiplexing receiving system according to claim 1, characterized in that, The input terminal of the switching switch receives multiple intermediate frequency signals; Its output terminal outputs signals to the corresponding processing unit of the frequency converter module according to the signal type.

6. A C / Ka dual-band multiplexing receiving system according to claim 1, characterized in that, The frequency conversion module includes a telemetry downconverter, a data transmission processing downconverter, and a matrix switch; The input terminal of the telemetry downconverter is connected to the telemetry signal output terminal of the switching switch, which is used to convert the analog telemetry signal into a digital telemetry signal, and its output terminal is connected to the matrix switch. The input terminal of the data transmission down-converter is connected to the data transmission signal output terminal of the switching switch, which is used to convert the analog data transmission signal into a digital telemetry signal, and its output terminal is connected to the matrix switch. The input and output terminals of the matrix switch are connected to the input and output terminals of the baseband processing module.

7. A C / Ka dual-band multiplexing receiving system according to claim 1, characterized in that, The baseband processing module includes a measurement and control baseband and a data transmission baseband; The measurement and control baseband is used to receive digital telemetry signals output by the frequency converter module and output telemetry analog test signals; The data transmission baseband is used to receive the digital data transmission signal output by the frequency converter module and output the data transmission analog test signal.

8. A C / Ka dual-band multiplexing receiving system according to any one of claims 7, characterized in that, The frequency conversion module also includes the analog processing unit, which includes a first analog up-conversion module and a second analog up-conversion module. The input terminal of the first analog upconversion module is connected to the output terminal of the matrix switch, and is used to receive the telemetry analog test signal transmitted back from the measurement and control baseband, and convert it into a telemetry analog intermediate frequency test signal; The input terminal of the second analog upconversion module is connected to the output terminal of the matrix switch and the output terminal of the first analog upconversion module, respectively, and is used to receive the data transmission analog test signal returned by the data transmission baseband and the telemetry analog intermediate frequency test signal output by the first analog upconversion module, and convert them into a unified analog intermediate frequency test signal; the output terminal of the second analog upconversion module is connected to the input terminal of the switching switch.

9. A C / Ka dual-band multiplexing receiving system according to claim 8, characterized in that, The radio frequency front-end module also includes an up-converter and a splitter; The input terminal of the splitter is connected to the analog intermediate frequency test signal output terminal of the switching switch, and its output terminal is connected to the input terminal of the C-band radio frequency processing unit. The input terminal of the upconverter is connected to the analog intermediate frequency test signal output terminal of the switching switch, and its output terminal is connected to the input terminal of the Ka-band radio frequency processing unit.

10. A C / Ka dual-band multiplexing receiving system according to claim 1, characterized in that, It also includes a clock generation unit, which includes a time-frequency device and a time-frequency generation splitter. The output of the time-frequency device is connected to the input of the time-frequency generation splitter, and the output of the time-frequency generation splitter is connected to the radio frequency front-end module and the frequency conversion module, respectively.

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