CN114244281B - Satellite-borne Ka frequency band broadband multi-channel down-conversion system - Google Patents
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Abstract
A satellite-borne Ka frequency band broadband multi-channel down-conversion system belongs to the technical field of satellite communication and solves the problems that a Ka frequency band down-conversion device in the prior art is not suitable for a multi-beam and multi-mode communication satellite transponder because the input frequency, the input power and the output signal bandwidth are not dynamically adjustable; the system is in modular design, and each module can be independently installed, so that the debugging and the maintenance are convenient; the modules are interconnected through connectors between boards, and the external interface is simple, so that the integrated circuit has the advantages of high integration and light weight; a Ka down-conversion circuit and a secondary frequency conversion circuit are adopted in a frequency conversion link of the multi-channel frequency conversion module; the Ka down-conversion circuit converts the input Ka radio-frequency signal into a C frequency band according to an adjustable local oscillator signal provided by the frequency synthesizer module, and the secondary frequency conversion circuit converts the C frequency band into an intermediate frequency according to a fixed two local oscillator signal provided by the frequency synthesizer module; the method has the advantages of wide band, adjustable input center frequency, adjustable input signal power, adjustable output signal bandwidth and low phase noise.
Description
Technical Field
The invention belongs to the technical field of satellite communication, and relates to a satellite-borne Ka frequency band broadband multi-channel down-conversion system.
Background
With the development of broadband communication services, the requirement on satellite communication capacity is continuously increased (high frequency band and high capacity), the available bandwidth of the traditional C and Ku frequency bands is only 500 MHz-600 MHz and cannot meet the requirement of high capacity transmission, the available bandwidth of the Ka frequency band is 3.5GHz at most, and the Ka frequency band is the mainstream frequency band used by the high-throughput satellite at present.
The effective load is composed of an antenna, a transponder, a controller and the like, and the frequency converter is an important component of the transponder and mainly realizes the receiving, frequency conversion and amplification of signals. The satellite-borne transponder has two modes of transparent forwarding and on-satellite regeneration, the two processing modes have different requirements on the bandwidth of signals, and the transparent forwarding mode aims at broadband signals; the on-board regeneration mode aims at narrow-band signals, users served by the two processing modes are different, and the input power of the transponder is also different. Aiming at the satellite communication requirements of large bandwidth, multiple frequency bands and multiple beams, and under the condition that the weight and the power consumption of a satellite are limited, the design of the broadband multi-channel frequency converter can simplify the design of a transponder, reduce the weight of a system and improve the flexibility and the stability of the use of the system.
In the prior art, the technical scheme of the invention patent application, namely, a down-conversion device and a down-conversion method of a broadband Ka frequency band, with publication number CN106026929A and publication number of 2016, realizes a 1GHz bandwidth by a method of twice frequency conversion from Ka to X and from X to 1.2G; according to the technical scheme of a Ka down converter for a low-power-consumption satellite, which is published in 2009 and has the publication number CN201294523Y, 500MHz bandwidth is realized by a Ka-to-X and X-to-C wave band twice frequency conversion method; however, the two documents are only the design of the down-conversion module, and for the frequency conversion module, the input frequency, the input power and the output signal bandwidth of the design scheme do not have the dynamic adjustable characteristic; and is not suitable for multi-beam and multi-mode communication satellite repeaters.
Disclosure of Invention
The invention aims to design a satellite-borne Ka-band broadband multi-channel down-conversion system, and aims to solve the problems that a Ka-band down-conversion device in the prior art is not suitable for a multi-beam and multi-mode communication satellite transponder because the input frequency, the input power and the output signal bandwidth are not dynamically adjustable.
A satellite-borne Ka-band broadband multi-channel down-conversion system comprises: the device comprises a power module, a control module, a frequency synthesis module and a multi-channel frequency conversion module; the power module, the control module, the frequency synthesizing module and the multi-channel frequency conversion module are interconnected through connectors between boards to realize signal transmission;
the power supply module is used for converting a primary power supply of a satellite bus into a secondary power supply, supplying power to the control module, the frequency synthesis module and the multi-channel frequency conversion module, and realizing power supply and outage control, surge suppression and remote measurement feedback of the secondary power supply;
the control module is used for realizing local oscillation frequency, channel attenuation and channel bandwidth control of the frequency conversion module;
the frequency synthesizer module is used for providing an adjustable local oscillator signal and a fixed two local oscillator signals for the multi-channel frequency conversion module;
the multichannel frequency conversion module comprises a multichannel frequency conversion link, and the frequency conversion link of each channel comprises a Ka down-conversion circuit and a secondary frequency conversion circuit; the Ka down-conversion circuit converts the input Ka radio-frequency signal into a C frequency band according to an adjustable local oscillator signal provided by the frequency synthesis module, and the secondary frequency conversion circuit converts the C frequency band into an intermediate frequency according to a fixed two local oscillator signal provided by the frequency synthesis module, filters, amplifies and outputs the intermediate frequency.
The system is designed in a modularized way according to the functions of the system, and each module can be independently installed, so that the debugging and the maintenance are convenient; the modules are interconnected through connectors between boards, and the external interface is simple, so that the integrated circuit has the advantages of high integration and light weight; the multi-channel frequency conversion module realizes multi-channel integration, and a frequency conversion link of the multi-channel frequency conversion module adopts a Ka down-conversion circuit and a secondary frequency conversion circuit; the Ka down-conversion circuit converts the input Ka radio-frequency signal into a C frequency band according to an adjustable local oscillator signal provided by the frequency synthesizer module, and the secondary frequency conversion circuit converts the C frequency band into an intermediate frequency according to a fixed two local oscillator signal provided by the frequency synthesizer module, and filters, amplifies and outputs the intermediate frequency; the method has the advantages of wide band, adjustable input center frequency, adjustable input signal power, adjustable output signal bandwidth and low phase noise.
Further, the frequency synthesizer module includes: the device comprises a preceding-stage power divider (10), a multi-path adjustable local oscillator signal generating circuit (11) and a multi-path fixed two local oscillator signal generating circuit (12); the output end of the preceding-stage power divider (10) is respectively connected with a multi-path adjustable local oscillation signal generating circuit (11) and a multi-path fixed two local oscillation signal generating circuit (12); the adjustable local oscillator signal generating circuit (11) is used for outputting an adjustable local oscillator signal, and the fixed two local oscillator signal generating circuit (12) is used for outputting a fixed two local oscillator signal.
Further, the adjustable local oscillator signal generating circuit (11) comprises: the device comprises a first power divider (111), a low-phase-noise PDRO point frequency source (112), a PLS phase-locked source (113), a first mixer (114), a filter amplifier (115) and a frequency doubling circuit (116); the output end of the preceding stage power divider (10) is connected with the input end of a first power divider (111), the output end of the first power divider (111) is respectively connected with the input ends of a low-phase noise PDRO point frequency source (112) and a PLS phase-locked source (113), the output end of the low-phase noise PDRO point frequency source (112) is connected with one input end of a first mixer (114), the output end of the PLS phase-locked source (113) is connected with the other input end of the first mixer (114), the output end of the first mixer (114) is connected with the input end of a filter amplifier (115), the output end of the filter amplifier (115) is connected with the input end of a frequency doubling circuit (116), and the output end of the frequency doubling circuit (116) is used as the output end of an adjustable local oscillator signal generating circuit (11).
Further, the fixed two local oscillator signal generating circuit (12) includes: the phase detector (121), the loop filter (122), the voltage-controlled oscillator (123) and the frequency divider (124); the output end of the preceding-stage power divider (10) is connected with one input end of a phase detector (121), the output end of the phase detector (121) is connected with the input end of a loop filter (122), the output end of the loop filter (122) is connected with the input end of a voltage-controlled oscillator (123), one output end of the voltage-controlled oscillator (123) serves as the output end of a fixed two-local-oscillator-signal generating circuit (12), the other output end of the voltage-controlled oscillator (123) is connected with the input end of a frequency divider (124), and the output end of the frequency divider (124) is connected with the other input end of the phase detector (121).
Further, an input 100MHz reference clock signal is amplified and power-divided by a pre-stage power divider (10) and then is sent to an adjustable local oscillator signal generating circuit (11) and a fixed two local oscillator signal generating circuit (12) to be used as reference signals; an adjustable local oscillator signal generating circuit (11) adopts a 14.6GHz low-phase-noise PDRO point frequency source (112) to carry out frequency mixing with a 2.2-3.6 GHz PLS phase-locked source (113), local oscillator leakage and high-frequency stray are suppressed through a low-pass filter after frequency mixing, a frequency doubling is carried out after filtering and amplifying to generate 11-12.4 GHz signals to generate a 22-24.8 GHz local oscillator signal, one local oscillator signal is a multi-channel independently adjustable 22.0-24.8 GHz frequency source, and the adjustment step is 100MHz; the fixed two local oscillator signal generating circuit (12) adopts a digital frequency division phase locking technology to generate a plurality of paths of 5.04GHz point frequency sources.
Further, the Ka down-conversion circuit includes: the device comprises a cavity filter (20), a first low-noise amplifier (21), a first numerical control attenuator (22), a second mixer (23), a second low-noise amplifier (24) and a low-pass filter (25); the output end of the cavity filter (20) is connected with the input end of a first low-noise amplifier (21), the output end of the first low-noise amplifier (21) is connected with the input end of a first numerical control attenuator (22), the output end of the first numerical control attenuator (22) is connected with the first input end of a second mixer (23), the second input end of the second mixer (23) is connected with the output end of a local oscillation signal generating circuit (11), the output end of the second mixer (23) is connected with the input end of a second low-noise amplifier (24), the output end of the second low-noise amplifier (24) is connected with the input end of a low-pass filter (25), and the output end of the low-pass filter (25) is connected with the input end of a secondary frequency conversion circuit.
Further, the working process of the Ka down-conversion circuit is as follows: the input signal frequency of the Ka down-conversion circuit is 28-30.8 GHz, the center frequency can be adjusted within the range of 28-30.8 GHz according to the step of 100M, the input signal range is-76-51 dBm, the input signal power can be dynamically adjusted within the range of 25dB by controlling a first numerical control attenuator (22) of the Ka down-conversion circuit, the first numerical control attenuator (22) adopts a 6-bit serial GaAs numerical control attenuator, the attenuation control range is 30dB, and after the input signal is mixed with a local oscillation signal, a radio frequency signal with the center frequency of 6GHz is output.
Furthermore, the secondary frequency conversion circuit comprises a C-band down-conversion unit, a switch filter bank and an intermediate frequency amplification circuit which are connected in sequence; the C-band down-conversion unit is connected with a fixed two-local-oscillator-signal generating circuit (12) and is used for mixing two local oscillator signals with input 6GHz radio-frequency signals, the switch filter bank is connected with three groups of intermediate-frequency filters by adopting a single-pole triple-throw switch to realize the function of switching signal output bandwidths, and the input 6GHz radio-frequency signals are converted to intermediate frequency 960M through an intermediate-frequency amplifying circuit.
The invention has the advantages that:
the system is designed in a modularized way according to the functions of the system, and each module can be independently installed, so that the debugging and the maintenance are convenient; the modules are interconnected through connectors between boards, and the external interface is simple, so that the integrated circuit has the advantages of high integration and light weight; the multichannel frequency conversion module realizes multichannel integration, and a Ka down-conversion circuit and a secondary frequency conversion circuit are adopted in a frequency conversion link; the Ka down-conversion circuit converts the input Ka radio-frequency signal into a C frequency band according to an adjustable local oscillator signal provided by the frequency synthesizer module, and the secondary frequency conversion circuit converts the C frequency band into an intermediate frequency according to a fixed two local oscillator signal provided by the frequency synthesizer module, and filters, amplifies and outputs the intermediate frequency; the method has the advantages of wide band, adjustable input center frequency, adjustable input signal power, adjustable output signal bandwidth and low phase noise.
Drawings
FIG. 1 is a block diagram of the general structure of a satellite-borne Ka-band broadband multi-channel down-conversion system according to an embodiment of the present invention;
FIG. 2 is a block diagram of a power module according to an embodiment of the invention;
FIG. 3 is a block diagram of a control module according to an embodiment of the present invention;
FIG. 4 is a block diagram of a multi-channel frequency conversion module according to an embodiment of the present invention;
fig. 5 is a block diagram of a frequency synthesizer module according to an embodiment of the present invention;
FIG. 6 is a schematic diagram of a Ka band down conversion circuit according to an embodiment of the present invention;
fig. 7 is a schematic diagram of a secondary down-conversion circuit according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are some embodiments of the present invention, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The technical scheme of the invention is further described by combining the drawings and the specific embodiments in the specification:
example one
As shown in fig. 1, the satellite-borne Ka band wideband multi-channel down conversion system provided in this embodiment includes: the device comprises a power module, a control module, a frequency synthesizer module and a multi-channel frequency conversion module; each module is independently designed, so that debugging, assembly and maintenance are facilitated; modules are spliced and interconnected through connectors between boards in a back-to-back mode, so that signal transmission is realized, interconnection cables are reduced, and the integration level of a system is improved; the power supply module is used for converting a primary power supply of a satellite bus into a secondary power supply, supplying power to the control module, the frequency synthesis module and the multi-channel frequency conversion module, and realizing power supply on-off control, surge suppression and remote measurement feedback of the secondary power supply; the control module is used for realizing local oscillation frequency, channel attenuation and channel bandwidth control of the frequency conversion module; the frequency synthesizing module is used for providing local oscillation signals for the frequency conversion module, and the output broadband local oscillation frequency can be flexibly configured through the low-frequency control signal; the multi-channel frequency conversion module is used for realizing the down-conversion of the Ka frequency band signal to the C frequency band, then converting the C frequency band signal to the intermediate frequency, and filtering, amplifying and outputting the intermediate frequency; the power module, the control module and the frequency synthesis module adopt the design of main and standby cold backup, and the reliability of the system is improved.
As shown in fig. 2, the power supply module outputs 3 kinds of secondary power supplies of +5V, -5V, and 12V after passing through the protection circuit, surge suppression, EMI filtering, and DC/DC conversion, supplies power to the control module, the frequency synthesis module, and the multi-channel frequency conversion module through the inter-board connector, and controls the power supply to be turned on and off and the power supply to be switched between the main power supply and the standby power supply through an external instruction.
As shown in fig. 3, after receiving a control instruction of the upper computer through a 1553B bus, the control module performs analysis processing, outputs a TTL control signal, and sends the TTL control signal to the frequency synthesizer module and the multi-channel frequency conversion module through the inter-board connector, thereby implementing configurable local oscillator frequency conversion, power adjustment and bandwidth switching of the output signal.
As shown in fig. 4, the frequency synthesizing module includes a preceding stage power divider 10, 8 independent adjustable local oscillator signal generating circuits 11, and 8 independent fixed two local oscillator signal generating circuits 12; the adjustable local oscillator signal generating circuit 11 includes: a first power divider 111, a low phase noise PDRO point frequency source 112, a PLS phase-locked source 113, a first mixer 114, a filter amplifier 115, and a frequency doubling circuit 116; the fixed two local oscillator signal generating circuit 12 includes: a phase detector 121, a loop filter 122, a voltage controlled oscillator 123, a frequency divider 124; the output end of the preceding-stage power divider 10 is respectively connected with the input end of a first power divider 111 in the 8-way independent adjustable local oscillator signal generating circuit 11 and one input end of a phase discriminator 121 in the 8-way independent fixed two-local oscillator signal generating circuit 12; the output end of the first power divider 111 is connected to the input ends of the low-phase-noise PDRO point frequency source 112 and the PLS phase-locked source 113, the output end of the low-phase-noise PDRO point frequency source 112 is connected to one input end of the first mixer 114, the output end of the PLS phase-locked source 113 is connected to the other input end of the first mixer 114, the output end of the first mixer 114 is connected to the input end of the filter amplifier 115, the output end of the filter amplifier 115 is connected to the input end of the frequency doubling circuit 116, and the output end of the frequency doubling circuit 116 is used as the output end of the adjustable local oscillator signal generating circuit 11; the output end of the phase detector 121 is connected to the input end of the loop filter 122, the output end of the loop filter 122 is connected to the input end of the voltage-controlled oscillator 123, one output end of the voltage-controlled oscillator 123 serves as the output end of the fixed-two local oscillator signal generating circuit 12, the other output end of the voltage-controlled oscillator 123 is connected to the input end of the frequency divider 124, and the output end of the frequency divider 124 is connected to the other input end of the phase detector 121.
An input 100MHz reference clock signal is amplified by a preceding stage power divider 10 and then is transmitted to an adjustable local oscillator signal generating circuit 11 and a fixed two local oscillator signal generating circuit 12 to serve as reference signals; an adjustable local oscillator signal generating circuit 11 adopts a 14.6GHz low-phase-noise PDRO point frequency source 112 and a 2.2-3.6 GHz PLS phase-locked source 113 for frequency mixing, adopts a low-phase-noise PDRO point frequency source, can configure a local oscillator adopting a 14.6GHz PDRO point frequency source, and mixes the frequency with a 2.2-3.6 GHz phase-locked source, and after frequency mixing, a low-pass filter suppresses local oscillator leakage and high-frequency stray, and after filtering and amplifying, generates 11-12.4 GHz signals, then performs frequency doubling to generate 22-24.8 GHz local oscillator signals, wherein one local oscillator signal is 8 paths of independently adjustable 22.0-24.8 GHz frequency sources, and is adjusted to be 100MHz; the two fixed local oscillator signal generating circuit 12 adopts a digital frequency division phase locking technology to generate 8 paths of 5.04GHz point frequency sources.
As shown in fig. 5, the multi-channel frequency conversion module includes 8-channel frequency conversion links, and each channel of the frequency conversion link includes a Ka down-conversion circuit and a secondary frequency conversion circuit; the Ka down-conversion circuit is connected with an adjustable local oscillator signal generating circuit 11, and the secondary frequency conversion circuit is connected with a fixed two local oscillator signal generating circuit 12; the input Ka radio frequency signal is subjected to frequency down-conversion to a C frequency band through a Ka down-conversion circuit, and the C frequency band is subjected to frequency conversion to an intermediate frequency through a secondary frequency conversion circuit and is filtered, amplified and output.
As shown in fig. 6, the Ka down-conversion circuit includes: a cavity filter 20, a first low noise amplifier 21, a first numerical control attenuator 22, a second mixer 23, a second low noise amplifier 24 and a low pass filter 25; the output end of the cavity filter 20 is connected with the input end of a first low-noise amplifier 21, the output end of the first low-noise amplifier 21 is connected with the input end of a first numerical control attenuator 22, the output end of the first numerical control attenuator 22 is connected with the first input end of a second frequency mixer 23, the second input end of the second frequency mixer 23 is connected with the output end of a local oscillation signal generating circuit 11, the output end of the second frequency mixer 23 is connected with the input end of a second low-noise amplifier 24, the output end of the second low-noise amplifier 24 is connected with the input end of a low-pass filter 25, and the output end of the low-pass filter 25 is connected with the input end of a secondary frequency conversion circuit; the Ka down-conversion circuit adopts bare chips for parallel sealing welding to form an independent small box, the frequency of an input signal is 28-30.8 GHz, the center frequency can be adjusted within the range of 28-30.8 GHz according to 100M in a stepping mode, the range of the input signal is-76 dBm to-51 dBm, dynamic adjustment of the power of the input signal within the range of 25dB is achieved by controlling a first numerical control attenuator 22 of the Ka down-conversion circuit, the first numerical control attenuator 22 adopts a 6-bit serial GaAs numerical control attenuator, and the attenuation control range is 30dB. After the input signal is mixed with a local oscillator signal, a radio frequency signal with the center frequency of 6GHz is output.
As shown in fig. 7, the secondary frequency conversion circuit includes a C-band down conversion unit, a switch filter bank, and an intermediate frequency amplification circuit, which are connected in sequence; the C-band down-conversion unit is connected with a fixed two-local-oscillator-signal generating circuit 12, two local oscillator signals and input 6GHz radio-frequency signals are mixed, the switch filter bank is connected with three groups of intermediate-frequency filters by adopting a single-pole triple-throw switch, the function of switching the signal output bandwidth of 350M/150M/50M is realized, the intermediate-frequency filter with the 350MHz bandwidth adopts an LC filter, the intermediate-frequency filter with the 150MHz/50MHz bandwidth adopts a medium filter, and the input 6GHz radio-frequency signals are converted to the intermediate frequency of 960M through an intermediate-frequency amplifying circuit.
Compared with the traditional down converter, the invention is modularly designed according to the functions, and each module can be independently designed, thereby being convenient for debugging and maintenance; the multichannel frequency conversion module is designed by adopting a bare chip when being realized, and the modules are interconnected through connectors between boards, so that the multichannel frequency conversion module has simple external interfaces and has the advantages of high integration and light weight; the invention has the advantages of wide band, adjustable input center frequency, adjustable input signal power, adjustable output signal bandwidth, low phase noise and the like.
The above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (8)
1. A satellite-borne Ka-band broadband multi-channel down-conversion system is characterized by comprising: the device comprises a power module, a control module, a frequency synthesizer module and a multi-channel frequency conversion module; the power module, the control module, the frequency synthesis module and the multi-channel frequency conversion module are interconnected through an inter-board connector to realize signal transmission;
the power supply module is used for converting a primary power supply of a satellite bus into a secondary power supply, supplying power to the control module, the frequency synthesis module and the multi-channel frequency conversion module, and realizing power supply and outage control, surge suppression and remote measurement feedback of the secondary power supply;
the control module is used for realizing local oscillation frequency, channel attenuation and channel bandwidth control of the frequency conversion module;
the frequency synthesis module is used for providing an adjustable local oscillator signal and a fixed local oscillator signal for the multi-channel frequency conversion module;
the multichannel frequency conversion module comprises a multichannel frequency conversion link, and the frequency conversion link of each channel comprises a Ka down-conversion circuit and a secondary frequency conversion circuit; the Ka down-conversion circuit converts the input Ka radio-frequency signal into a C frequency band according to an adjustable local oscillator signal provided by the frequency synthesis module, and the secondary frequency conversion circuit converts the C frequency band into an intermediate frequency according to a fixed two local oscillator signal provided by the frequency synthesis module, filters, amplifies and outputs the intermediate frequency.
2. The satellite-borne Ka-band wideband multi-channel down-conversion system according to claim 1, wherein the frequency synthesizer module comprises: the device comprises a preceding-stage power divider (10), a multi-path adjustable local oscillation signal generating circuit (11) and a multi-path fixed two local oscillation signal generating circuit (12); the output end of the preceding-stage power divider (10) is respectively connected with a multi-path adjustable local oscillation signal generating circuit (11) and a multi-path fixed two local oscillation signal generating circuit (12); the adjustable local oscillator signal generating circuit (11) is used for outputting an adjustable local oscillator signal, and the fixed two local oscillator signal generating circuit (12) is used for outputting a fixed two local oscillator signal.
3. A satellite-borne Ka-band wideband multi-channel down-conversion system according to claim 2, wherein the tunable local oscillator signal generating circuit (11) comprises: the device comprises a first power divider (111), a low-phase-noise PDRO point frequency source (112), a PLS phase-locked source (113), a first mixer (114), a filter amplifier (115) and a frequency doubling circuit (116); the output end of the preceding stage power divider (10) is connected with the input end of a first power divider (111), the output end of the first power divider (111) is respectively connected with the input ends of a low-phase noise PDRO point frequency source (112) and a PLS phase-locked source (113), the output end of the low-phase noise PDRO point frequency source (112) is connected with one input end of a first mixer (114), the output end of the PLS phase-locked source (113) is connected with the other input end of the first mixer (114), the output end of the first mixer (114) is connected with the input end of a filter amplifier (115), the output end of the filter amplifier (115) is connected with the input end of a frequency doubling circuit (116), and the output end of the frequency doubling circuit (116) is used as the output end of an adjustable local oscillator signal generating circuit (11).
4. A satellite-borne Ka-band wideband multi-channel down-conversion system according to claim 3, wherein said fixed two local oscillator signal generating circuit (12) comprises: the phase detector (121), the loop filter (122), the voltage-controlled oscillator (123) and the frequency divider (124); the output end of the preceding-stage power divider (10) is connected with one input end of the phase detector (121), the output end of the phase detector (121) is connected with the input end of the loop filter (122), the output end of the loop filter (122) is connected with the input end of the voltage-controlled oscillator (123), one output end of the voltage-controlled oscillator (123) serves as the output end of the fixed two-local-oscillator-signal generating circuit (12), the other output end of the voltage-controlled oscillator (123) is connected with the input end of the frequency divider (124), and the output end of the frequency divider (124) is connected with the other input end of the phase detector (121).
5. The satellite-borne Ka-band broadband multichannel down conversion system according to claim 4, wherein an input 100MHz reference clock signal is amplified by a pre-stage power divider (10) and then sent to an adjustable local oscillator signal generating circuit (11) and a fixed two local oscillator signal generating circuit (12) as reference signals; an adjustable local oscillator signal generating circuit (11) adopts a 14.6GHz low-phase-noise PDRO point frequency source (112) to carry out frequency mixing with a 2.2-3.6 GHz PLS phase-locked source (113), local oscillator leakage and high-frequency stray are suppressed through a low-pass filter after frequency mixing, a frequency doubling is carried out after filtering and amplifying to generate 11-12.4 GHz signals to generate a 22-24.8 GHz local oscillator signal, one local oscillator signal is a multi-channel independently adjustable 22.0-24.8 GHz frequency source, and the adjustment step is 100MHz; the fixed two local oscillator signal generating circuit (12) adopts a digital frequency division phase locking technology to generate a plurality of paths of 5.04GHz point frequency sources.
6. The satellite-borne Ka-band wideband multi-channel down-conversion system according to claim 3, wherein the Ka down-conversion circuit comprises: the device comprises a cavity filter (20), a first low-noise amplifier (21), a first numerical control attenuator (22), a second mixer (23), a second low-noise amplifier (24) and a low-pass filter (25); the output end of the cavity filter (20) is connected with the input end of a first low-noise amplifier (21), the output end of the first low-noise amplifier (21) is connected with the input end of a first numerical control attenuator (22), the output end of the first numerical control attenuator (22) is connected with the first input end of a second mixer (23), the second input end of the second mixer (23) is connected with the output end of a local oscillation signal generating circuit (11), the output end of the second mixer (23) is connected with the input end of a second low-noise amplifier (24), the output end of the second low-noise amplifier (24) is connected with the input end of a low-pass filter (25), and the output end of the low-pass filter (25) is connected with the input end of a secondary frequency conversion circuit.
7. The satellite-borne Ka-band wideband multi-channel down-conversion system according to claim 6, wherein the working process of the Ka down-conversion circuit is as follows: the input signal frequency of the Ka down-conversion circuit is 28-30.8 GHz, the center frequency can be adjusted within the range of 28-30.8 GHz according to the step 100M, the input signal range is-76-51 dBm, dynamic adjustment within the range of 25dB of the input signal power is realized by controlling a first numerical control attenuator (22) of the Ka down-conversion circuit, the first numerical control attenuator (22) adopts a 6-bit serial GaAs numerical control attenuator, the attenuation control range is 30dB, and after the input signal is mixed with a local oscillator signal, a radio frequency signal with the center frequency of 6GHz is output.
8. The satellite-borne Ka-band broadband multichannel down-conversion system according to claim 6, wherein the secondary frequency conversion circuit comprises a C-band down-conversion unit, a switch filter bank and an intermediate frequency amplification circuit which are connected in sequence; the C-band down-conversion unit is connected with a fixed two-local-oscillator-signal generating circuit (12) and is used for mixing two local oscillator signals with input 6GHz radio-frequency signals, the switch filter bank is connected with three groups of intermediate-frequency filters by adopting a single-pole triple-throw switch to realize the function of switching signal output bandwidths, and the input 6GHz radio-frequency signals are converted to intermediate frequency 960M through an intermediate-frequency amplifying circuit.
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