CN114389636B - Multi-band high-performance signal processing platform - Google Patents
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
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- H—ELECTRICITY
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- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/005—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission adapting radio receivers, transmitters andtransceivers for operation on two or more bands, i.e. frequency ranges
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Abstract
The invention provides a multi-band high-performance signal processing platform, which comprises: the device comprises a down-conversion module, an intermediate frequency signal processing module, an up-conversion module, a frequency synthesis module and a computer control module; the down-conversion module can down-convert the radio frequency signals of the frequency range of 8 GHz-40 GHz into intermediate frequency signals, and the intermediate frequency signal processing module: performing target echo, interference and clutter characteristic modulation on the intermediate frequency signal output by the down-conversion module to obtain intermediate frequency target echo, interference and clutter signals; the intermediate frequency signal processing module can also generate an intermediate frequency radar radiation source signal; up-conversion module: the device is used for up-converting the intermediate frequency signal to a radio frequency matched with the input signal and outputting the radio frequency signal; and the frequency synthesis module is used for: the frequency synthesizer is used for generating a frequency synthesis local oscillation signal required by the down-conversion module and the up-conversion module when the down-conversion module and the up-conversion module perform frequency conversion and a reference clock signal required by the system operation; and the computer control module controls all the functional modules in real time.
Description
Technical Field
The invention belongs to the technical field of radio frequency signal processing, and relates to a multi-band high-performance signal processing platform.
Background
In order to test the technical index performance of the tested equipment or develop tactical research, a simulation test environment needs to be provided for the tested equipment, and the simulation test environment construction method mainly comprises full-digital simulation, semi-physical simulation, external field targeting and the like, wherein the semi-physical simulation is paid more attention to more and more because the semi-physical simulation has the advantages of being capable of participating in a test in a real object, being capable of developing a repeated test to obtain a large amount of sample data, being low in cost and the like. In the semi-physical simulation system, target echo, interference, clutter and radiation source signals are generally simulated through a radar signal simulator, the coverage range of the working frequency band of the conventional radar signal simulator is small, the instantaneous bandwidth limited by the sampling rate is not large enough, the function is single, and the simulation test requirements of various tested devices cannot be met at the same time.
Disclosure of Invention
In order to solve the technical problems, the invention provides a multi-band high-performance signal processing platform, wherein the platform adopts a VPX bus architecture, and the platform comprises: the device comprises a down-conversion module, an intermediate frequency signal processing module, an up-conversion module, a frequency synthesis module and a computer control module;
the down-conversion module is used for down-converting the radio frequency signals of the frequency range of 8 GHz-40 GHz into intermediate frequency signals, and the frequency of the intermediate frequency signals is in the intermediate frequency range set by the intermediate frequency signal processing module;
the intermediate frequency signal processing module is used for performing target echo, interference and clutter characteristic modulation on the intermediate frequency signal output by the down-conversion module to obtain intermediate frequency target echo, interference and clutter signals; the intermediate frequency signal processing module can also generate an intermediate frequency radar radiation source signal;
the up-conversion module is used for up-converting the intermediate frequency radar radiation source signal, the intermediate frequency target echo, the interference and clutter signal generated by the intermediate frequency signal processing module to a radio frequency matched with an input signal and outputting a radio frequency signal;
the frequency synthesis module is used for generating a frequency synthesis local oscillation signal required by the down-conversion module and the up-conversion module when the down-conversion module and the up-conversion module execute frequency conversion and a reference clock signal required by the platform work;
and the computer control module is used for receiving the control instruction and the parameters issued by the control computer, resolving the control instruction and the parameters in real time, and completing the real-time control of each functional module according to the resolving result.
Further, the down-conversion module is divided into a plurality of down-conversion links, the working frequency bands of the down-conversion links are sequentially connected from low to high to cover the frequency bands of 8 GHz-40 GHz, and each down-conversion link comprises: an input amplitude control link and a down-conversion module;
the input amplitude control link comprises: a large and small power switching unit and a numerical control attenuator ATT;
the high-low power switching unit includes: the system comprises 2 single-pole double-throw switches, a low-noise amplifier and a fixed attenuator, wherein radio frequency signals selected by the 2 single-pole double-throw switches are controlled to be input into a digital control attenuator ATT after passing through a low-noise amplifier path or a fixed attenuation path, and radio frequency signals output by the digital control attenuator ATT are transmitted to a down-conversion module after passing through the single-pole single-throw switches;
the down-conversion module comprises the following components connected in sequence: the intermediate frequency signal output by the third mixer is input to the intermediate frequency signal processing module through the selection switch after the second mixer and the third mixer are subjected to down-conversion twice.
Further, the ATT dynamic range of the numerical control attenuator is 60dB;
the plurality of down-conversion links is divided into at least three links, including: a high frequency down-conversion link, an intermediate frequency down-conversion link and a low frequency down-conversion link;
the high-frequency down-conversion link and the low-frequency down-conversion link are combined to use the same down-conversion module;
the output of the high-frequency down-conversion link power switching unit is directly input to the down-conversion module through 1 single-pole double-throw selection switch;
an up-conversion circuit is arranged between the high-power switching unit of the low-frequency down-conversion link and the single-pole double-throw selection switch, so that radio frequency signals are converted from the frequency band of the low-frequency link to the frequency band of the high-frequency link;
when the high-frequency down-conversion link and the low-frequency down-conversion link are combined and use the same down-conversion module, a switch filter bank is arranged behind the single-pole double-throw selection switch.
Further, the intermediate frequency signal processing module comprises a broadband signal processing board, and the broadband signal processing board comprises: an analog-to-digital conversion AD sub-card, a digital-to-analog conversion DA sub-card and a signal processing carrier plate;
the intermediate frequency signal is input into the input end of the AD sub-card, and the output end of the AD sub-card is connected with the input end of the signal processing carrier plate through an FMC+ connector;
the output end of the signal processing carrier plate is connected with the input end of the digital-to-analog conversion DA sub-card through an FMC+ connector;
the signal processing carrier plate comprises a main control unit, a high-performance FPGA chip unit, an SDRAM unit, a FLASH unit and a BMC unit, wherein each unit forms a channelized frequency measurement module, a digital down-conversion module, a target echo/interference/clutter and radiation source signal generation module and a digital up-conversion module by running digital signal processing firmware;
and the digital-to-analog conversion DA sub-card outputs the intermediate frequency signal after digital-to-analog conversion.
Further, the internal transmission rate of the broadband signal processing board is not lower than 10Gbps;
the AD sub-card sampling rate is 12bit x 9Gsps, and the sampling clock is generated by an external reference clock or directly input by the outside;
the DA sub-card sampling rate is 16bit 9Gsps, and the sampling clock is generated by an external reference clock or directly input by the outside.
Further, the up-conversion module receives the intermediate frequency signal output by the intermediate frequency signal processing module and divides the intermediate frequency signal into a plurality of up-conversion links, the working frequency bands of the up-conversion links are sequentially connected from low to high to cover the frequency bands of 8 GHz-40 GHz, and the intermediate frequency signal output by the intermediate frequency signal processing module is selected to enter the up-conversion links of different frequency bands through the gating switch;
each up-conversion link comprises: up-conversion circuit and output amplitude control circuit
The output amplitude control circuit comprises two stages of radio frequency power amplifiers and a numerical control attenuator ATT which are sequentially connected in series; the output end of the output amplitude control circuit is connected with a single-pole single-throw change-over switch;
each up-conversion circuit comprises a plurality of circuits connected in sequence: the first intermediate frequency filter, the fourth mixer, the second intermediate frequency filter and the fifth mixer are used for transmitting the radio frequency signals output after the up-conversion twice to the output amplitude control circuit through the switch filter bank and the frequency band change-over switch.
Further, the plurality of up-conversion links are divided into at least three frequency band outputs, including a high frequency band output, a middle frequency band output, and a low frequency band output;
the low-frequency band output comprises an intermediate down-conversion module, and the intermediate down-conversion module is arranged between an up-conversion circuit of a high-frequency band and an output amplitude control circuit of the low-frequency band and comprises a plurality of down-conversion circuits which are sequentially connected in series: a selector switch, a down-conversion mixer and a switching filter bank convert the output of the high-band up-conversion circuit to a low-band.
Further, the plurality of up-conversion links and the plurality of down-conversion links are equally divided into three frequency bands: 8 GHz-18 GHz, 18 GHz-30 GHz and 30 GHz-40 GHz; the output dynamic range of each frequency band is not less than 110dB; the instantaneous bandwidth of the down-conversion module and the up-conversion module is 4GHz.
Furthermore, the frequency synthesizer module adopts a high-stability constant-temperature crystal oscillator to generate a reference clock signal, and the reference clock signal generates a multi-channel frequency synthesizer local oscillator signal and a working clock signal through a PLL phase-locked circuit.
Further, the computer control module receives a control instruction issued by an external control computer and performs resolving, and real-time control on the down-conversion module, the intermediate frequency signal processing unit, the up-conversion module and the frequency synthesis module is completed according to the resolving result.
The multi-band high-performance signal processing platform can provide target echoes (including point targets, one-dimensional range targets, surface targets and the like) covering 8 GHz-40 GHz frequency bands and 4GHz ultra-large bandwidth, interference (including suppression type interference and deception type interference), clutter (including ground clutter, sea clutter, weather clutter, foil clutter and the like) and radiation source (including continuous waves, simple pulses, PD, linear frequency modulation, phase coding, frequency agility, repetition frequency dispersion/jitter/slippage and the like) signals for tested equipment, and is an essential key equipment for checking tactical technical performance indexes of the tested equipment.
Drawings
FIG. 1 is a block diagram of a multi-band high performance signal processing platform according to an embodiment of the present invention;
fig. 2 is a functional block diagram of a down-conversion module according to an embodiment of the present invention;
fig. 3 is a functional block diagram of an intermediate frequency signal processing unit according to an embodiment of the present invention;
fig. 4 is a functional block diagram of an up-conversion module according to an embodiment of the present invention;
fig. 5 is a functional block diagram of a frequency synthesizer module according to an embodiment of the present invention.
Detailed Description
Aiming at the defects of the prior art, the invention aims to provide a multi-band high-performance signal processing platform construction scheme to solve the problems of small coverage range of a working band, small instantaneous bandwidth, single function and the like of a conventional radar signal simulator.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows:
a multi-band high-performance signal processing platform comprises a down-conversion module, an intermediate frequency signal processing unit, an up-conversion module, a frequency synthesis module and a computer control module. The down-conversion module is used for down-converting the radio frequency signals of the frequency range of 8 GHz-40 GHz into an intermediate frequency range required by the intermediate frequency signal processing unit; the intermediate frequency signal processing module is used for modulating the characteristics of the target echo, the interference and the clutter on the basis of the intermediate frequency signal obtained by the down-conversion module, obtaining intermediate frequency target echo, interference and clutter signals, and directly and passively generating intermediate frequency radar radiation source signals; the up-conversion module is used for up-converting the intermediate frequency target echo, interference, clutter and radiation source signals modulated and generated by the intermediate frequency signal processing unit to the radio frequency matched with the input signals and outputting the radio frequency; the frequency synthesis module is used for generating a frequency synthesis local oscillation signal required by frequency conversion and a reference clock signal required by system operation; the computer control module is used for receiving control instructions and parameters issued by an external control computer, resolving the control instructions and parameters in real time, and completing real-time control on each functional module according to resolving results. The platform adopts a VPX architecture design.
Further, the down-conversion module comprises 3 down-conversion links which are respectively used for controlling the input amplitude and down-conversion processing of 3 frequency band signals of 8 GHz-18 GHz, 18 GHz-30 GHz, 30 GHz-40 GHz and the like. After the signals of each frequency band enter the down-conversion module, firstly, input amplitude control is carried out to ensure that the input signals enter the post-stage frequency conversion unit with constant power. The amplitude control link is mainly composed of a large and small power switching unit and a numerical control attenuator. The large-small power switching unit comprises two paths, one path is a low-noise amplification path, the other path is a fixed attenuation path, and the gain of the low-noise amplification path is 30dB greater than that of the fixed attenuation path through power allocation. The dynamic state of the numerical control attenuator is 60dB, and the combination of the large and small power switching units and the numerical control attenuator can realize the receiving dynamic state of not less than 80 dB. The input amplitude control link has the advantages that the problem of input end saturation can be properly avoided, the realization mode is that an input signal is controlled to be transmitted through a low-noise amplification path under a low power state, amplitude control is carried out through a program-controlled attenuator ATT, when the ATT attenuation reaches 30dB, the input is judged to be in a high power state, at the moment, the control signal is transmitted through a fixed attenuation path, meanwhile, the ATT attenuation is set to zero, when the input signal power is continuously increased, the amplitude control is continuously carried out through the ATT until the attenuation reaches the maximum, and at the moment, the input signal power is the maximum unsaturated input power of the platform. The signals of each frequency band are respectively subjected to down-conversion treatment after being subjected to input amplitude control. The 8 GHz-18 GHz frequency band signal is firstly mixed with the local oscillator 1 to a frequency range of 30 GHz-40 GHz, is subjected to switch filtering after being combined with the input signal of the frequency range of 30 GHz-40 GHz, is mixed with the frequency synthesizer 2 to a frequency range of 7.5GHz plus or minus 2GHz after multi-order intermodulation spurious generated by the mixing is filtered, and is finally mixed with the local oscillator 3 to a frequency range of 2.25GHz plus or minus 2 GHz; the 18 GHz-30 GHz frequency band input signal is mixed with the frequency synthesizer 2 to a frequency range of 7.5GHz + -2 GHz, and then mixed with the local oscillator 3 to a frequency range of 2.25GHz + -2 GHz. In the down-conversion link, each switch filter group reserves expansion bandwidth of + -2 GHz or more, and the 4GHz instantaneous bandwidth of each frequency point signal is ensured not to be lost.
Furthermore, the intermediate frequency signal processing unit mainly comprises a broadband signal processing board, the board is a universal DRFM platform, and digital signal processing firmware can be operated to realize simulation of various types of signals such as target echoes (including point targets, one-dimensional range profile targets, surface targets and the like), interference (including suppression type interference and deception type interference), clutter (including ground clutter, sea clutter, weather clutter, foil clutter and the like), and radiation source (including continuous waves, simple pulses, PD, linear frequency modulation, phase coding, frequency agility, heavy frequency dispersion/jitter/slippage and the like) signal patterns.
Further, the broadband signal processing board is composed of an AD sub-card, a DA sub-card and a signal processing carrier board, and the AD sub-card and the DA sub-card are connected with the signal processing carrier board at a high speed through an FMC+ connector, wherein the transmission rate is not lower than 10Gbps. The AD sub-card is a standard single-width FMC+ interface board card with a high-speed ADC and a clock generation unit and is used for realizing analog-to-digital conversion, the sampling rate is 12bit@9Gsps, and the sampling clock can be generated according to an external reference clock or directly input from the outside; the DA sub-card is a standard single-width FMC+ interface board card with a high-speed DAC and a clock generation unit and is used for realizing digital-to-analog conversion, the sampling rate is 16bit@9Gsps, and the sampling clock can be generated according to an external reference clock or directly input from the outside; the signal processing carrier board adopts a VPX bus architecture, a main control unit, a high-performance FPGA chip, SDRAM, FLASH, a BMC unit and other hardware resources are integrated on the board card, and the resources are organically combined to form an intermediate frequency signal processing platform which is the most core of the system, and signal processing firmware is operated in the high-performance FPGA chip to realize a high-speed digital modulation function.
Further, the up-conversion module comprises 3 up-conversion links which are respectively used for realizing up-conversion and output amplitude control functions of 3 frequency bands such as 8 GHz-18 GHz, 18 GHz-30 GHz, 30 GHz-40 GHz and the like. The up-conversion module receives an intermediate frequency signal output by the intermediate frequency signal processing unit, enters frequency conversion links of different frequency bands through switch gating, mixes one path with a local oscillator 3 to a frequency range of 7.5GHz +/-2 GHz, mixes the filtered intermediate frequency signal with a frequency synthesizer 2 to a frequency range of 18 GHz-30 GHz, filters the filtered intermediate frequency signal through a switch filter bank, and then controls and outputs amplitude; the other path is mixed with the local oscillator 3 to a frequency range of 7.5GHz +/-2 GHz, filtered and mixed with the frequency synthesizer 2 to a frequency range of 30 GHz-40 GHz, filtered by a switch filter group and then divided into two paths, one path is directly subjected to amplitude control and then output, and the other path is mixed with the local oscillator 1 to be down-changed to a frequency range of 8 GHz-18 GHz and then subjected to amplitude control and output. In the up-conversion link, each switch filter group reserves expansion bandwidth of + -2 GHz or more, and the 4GHz instantaneous bandwidth of each frequency point signal is ensured not to be lost. The amplitude control links of each frequency band adopt multistage numerical control attenuator cascade to realize ultra-large output dynamic, and the output dynamic range of each frequency band is not less than 110dB, so that the simulation test requirements can be met.
Furthermore, the frequency synthesis module comprises a high-stability constant-temperature crystal oscillator, a PLL phase-locked source and a frequency conversion link. The high-stability constant-temperature crystal oscillator is used for generating a high-quality reference clock signal, and the reference clock signal is divided into multiple paths and used as excitation signals of a phase-locked loop (PLL) phase-locked source respectively to generate a point-frequency local oscillation signal and a working clock signal; the frequency conversion link generates a frequency synthesis 2 signal required for frequency conversion through frequency mixing.
Further, the computer control module is realized by an on-board main control unit of the broadband signal processing board of the intermediate frequency signal processing unit, receives and calculates a control instruction issued by an external control computer through a network, and completes real-time control of each functional unit according to a settlement result.
The following detailed description of specific embodiments of the invention refers to the accompanying drawings.
As shown in FIG. 1, the multi-band high-performance signal processing platform comprises a down-conversion module, an up-conversion module of an intermediate frequency signal processing unit, a frequency synthesis module and a computer control module. The signals in the frequency range of 8 GHz-40 GHz are divided into three frequency bands of 8 GHz-18 GHz, 18 GHz-30 GHz and 30 GHz-40 GHz, the injection signals are firstly sent to a down-conversion module, the down-conversion module carries out input power control and down-conversion treatment on the injection signals in the frequency bands respectively, the input radio frequency signals are converted into intermediate frequency signals in the frequency range of 2.25GHz +/-2 GHz with constant power, and the intermediate frequency signals are output to an intermediate frequency signal processing unit. The intermediate frequency signal processing unit performs AD sampling, digital modulation, DA conversion and other processes on an intermediate frequency signal input into a frequency range of 2.25GHz +/-2 GHz, and generates an intermediate frequency target echo, interference, clutter or radiation source signal. The up-conversion module receives the intermediate frequency signals output by the intermediate frequency signal processing unit, respectively up-converts the intermediate frequency signals to three frequency bands of 8 GHz-18 GHz, 18 GHz-30 GHz and 30 GHz-40 GHz, respectively carries out output power control, and outputs the signals subjected to power control in frequency division. The frequency synthesis module provides frequency synthesis local oscillation signals required by frequency conversion for the down-conversion module and the up-conversion module and provides reference clock signals for the intermediate frequency signal processing unit. The computer control module receives the control instruction issued by external control calculation through the main control unit on the broadband signal processing board of the intermediate frequency signal processing unit, performs real-time calculation, and completes the real-time control of the down-conversion module, the intermediate frequency signal processing unit, the up-conversion module and the frequency synthesis module according to the calculation result.
As shown in FIG. 2, the down-conversion module comprises 3 input ports of 8 GHz-18 GHz, 18 GHz-30 GHz, 30 GHz-40 GHz and the like, and the down-conversion module is used for respectively receiving signals in corresponding frequency bands. After the signals of each frequency band enter the down-conversion module, firstly, input amplitude control is carried out to ensure that the input signals enter the post-stage frequency conversion unit with constant power. The amplitude control link is mainly composed of a large and small power switching unit and a numerical control attenuator. The large-small power switching unit comprises two paths, one path is a low-noise amplification path, the other path is a fixed attenuation path, and the gain of the low-noise amplification path is 30dB greater than that of the fixed attenuation path through power allocation. The dynamic state of the numerical control attenuator is 60dB, and the combination of the large and small power switching units and the numerical control attenuator can realize the receiving dynamic state of not less than 80 dB. The signals of each frequency band are respectively subjected to down-conversion treatment after being subjected to input amplitude control. The 8 GHz-18 GHz frequency band signal is firstly mixed with the local oscillator 1 to a frequency range of 30 GHz-40 GHz, is subjected to switching filtering after being combined with the input signal of the frequency range of 30 GHz-40 GHz, is subjected to power amplification after filtering out multi-order intermodulation spurious, is mixed with the frequency synthesizer 2 to a frequency range of 7.5GHz plus or minus 2GHz, is mixed with the local oscillator 3 to a frequency range of 2.25GHz plus or minus 2GHz after being subjected to filtering amplification, and is subjected to filtering amplification again; the 18 GHz-30 GHz frequency band signal controlled by the input power is mixed with the frequency synthesizer 2 to a frequency range of 7.5GHz + -2 GHz after being amplified, filtered and amplified, mixed with the local oscillator 3 to a frequency range of 2.25GHz + -2 GHz, and filtered and amplified again. And two paths of 2.25GHz + -2 GHz intermediate frequency signals are output through the SP2T switch. In the down-conversion link, each switch filter group reserves expansion bandwidth of + -2 GHz or more, and the 4GHz instantaneous bandwidth of each frequency point signal is ensured not to be lost.
As shown in fig. 3, the intermediate frequency signal processing unit mainly comprises 1 broadband signal processing board, and mainly comprises an AD sub-card, a signal processing carrier board and a DA sub-card. The intermediate frequency signal processing unit receives intermediate frequency signals output by the down-conversion module, the intermediate frequency signals are subjected to high-speed sampling through the AD sub-card, the sampled high-speed digital signals are transmitted to the signal processing carrier plate through a high-speed FMC+ interface, in the signal processing carrier plate, the digital signals enter the FPGA chip through a high-speed GTY interface, the intermediate frequency digital signals entering the FPGA chip are divided into two paths, one path is used for carrying out channelized frequency measurement, the frequency measurement result is used for guiding the other path of intermediate frequency digital signals to carry out digital down-conversion (DDC), the 2.25GHz intermediate frequency is down-converted to zero intermediate frequency, target, interference or clutter characteristic modulation is carried out on the zero intermediate frequency, the FPGA chip can also directly generate zero intermediate frequency radiation source signals, the zero intermediate frequency target, interference, clutter and radiation source signals are up-converted to 2.25GHz intermediate frequency through the high-speed FMC+ interface, and finally the zero intermediate frequency signals are transmitted to the DA sub-card, and the zero intermediate frequency signal is played and output through the DA sub-card.
As shown in FIG. 4, the up-conversion module comprises three up-conversion channels of 8 GHz-18 GHz, 18 GHz-30 GHz, 30 GHz-40 GHz and the like, and the up-conversion module receives the intermediate frequency signals of the frequency bands of 2.25GHz + -2 GHz output by the intermediate frequency signal processing unit and enters different frequency conversion links through SP2T switch gating. One path of the frequency synthesizer is mixed with a local oscillator 3 to a frequency range of 7.5GHz +/-2 GHz after the out-of-band spurious is filtered by a 2.25GHz +/-2 GHz band-pass filter, mixed with a frequency synthesizer 2 to a frequency range of 18 GHz-30 GHz after the out-of-band spurious is filtered by a switch filter bank, amplitude control is carried out through an ATT and an amplifier, and finally the frequency synthesizer is modulated and output through SPST; the other path is mixed with the local oscillator 3 to a frequency range of 7.5GHz +/-2 GHz, is mixed with the frequency synthesizer 2 to a frequency range of 30 GHz-40 GHz after being filtered by a switch filter bank, is divided into two paths through an SP2T switch, and one path is directly subjected to amplitude control through an ATT and an amplifier and is then modulated and output through an SPST; the other path of the mixed frequency is mixed with the local oscillator 1 to be changed to 8 GHz-18 GHz, multi-order intermodulation spurs caused by the mixing are filtered through a switch filter group, then amplitude control is carried out through an ATT and an amplifier, and then SPST modulation output is carried out. In the up-conversion link, each switch filter group reserves expansion bandwidth of + -2 GHz or more, and the 4GHz instantaneous bandwidth of each frequency point signal is ensured not to be lost. The amplitude control links of each frequency band adopt multistage numerical control attenuator cascade to realize ultra-large output dynamic, and the output dynamic range of each frequency band is not less than 110dB.
As shown in FIG. 5, the frequency synthesizer module is mainly composed of a high-stability constant-temperature crystal oscillator, a PLL phase-locked source and a link. The high-stability constant-temperature crystal oscillator generates a high-quality 100MHz reference clock signal and divides power into eight paths. One path generates 9.75GHz point frequency local oscillation signals through a PLL phase-locked source and is used as LO3; one path generates a working clock signal of the 281.25MHz intermediate frequency signal processing unit through a PLL phase-locked source; one path is divided into six paths, 20/22/24/26/28/30 equal-point-frequency local oscillation signals are respectively generated by a plurality of PLL phase-locked sources, 20GHz, 22GHz and 28GHz point-frequency local oscillation signals are gated through an SP3T switch, and 2 paths are divided into 2 paths to form the point-frequency local oscillation signals with variable frequency as LO1; one path of the frequency integrated signals is divided into four paths, wherein one path of the frequency integrated signals generates frequency integrated signals in the range of 4 GHz-6 GHz by a 4 GHz-6 GHz variable PLL and steps by 1MHz, and the other three paths of the frequency integrated signals respectively generate point frequency local oscillation signals of 4.5GHz, 5GHz and 5.5GHz by 3 PLLs; the remaining 100MHz reference clock signal serves as a backup. The 4 GHz-6 GHz frequency integrated signal and the point frequency local oscillation signals of 4.5GHz, 5GHz and 5.5GHz are subjected to gating control through switch gating, and the gated 4 GHz-6 GHz frequency integrated signal and the 20/22/24/26/28/30 point frequency local oscillation signal are mixed to obtain a slow frequency-conversion integrated signal with the frequency range of 23 GHz-38 GHz and the stepping of 1 MHz; the point frequency local oscillation signals of 4.5GHz, 5GHz and 5.5GHz are mixed with the 20/22/24/26/28/30 point frequency local oscillation signals to obtain the fast frequency conversion integrated signals of 23 GHz-38 GHz frequency range and stepping 500MHz, and the fast frequency conversion integrated signals can adapt to different test requirements.
The multi-band high-performance signal processing platform can provide target echoes (including point targets, one-dimensional range targets, surface targets and the like) covering 8 GHz-40 GHz frequency bands and 4GHz ultra-large bandwidth, interference (including suppression type interference and deception type interference), clutter (including ground clutter, sea clutter, weather clutter, foil clutter and the like) and radiation source (including continuous wave, simple pulse, PD, linear frequency modulation, phase coding, frequency agility, repetition frequency dispersion/jitter/slippage and the like) signals for tested equipment, and is an indispensable key equipment for checking tactical technical performance indexes of the tested equipment.
Finally, it should be noted that the above-mentioned embodiments are merely for illustrating the technical solution of the embodiment of the present invention, and not for limiting, and although the embodiment of the present invention has been described in detail with reference to the above-mentioned preferred embodiments, it should be understood by those skilled in the art that modifications and equivalent substitutions can be made to the technical solution of the embodiment of the present invention without departing from the spirit and scope of the technical solution of the embodiment of the present invention.
Claims (9)
1. A multi-band high performance signal processing platform, wherein the platform employs a VPX bus architecture, the platform comprising: the device comprises a down-conversion module, an intermediate frequency signal processing module, an up-conversion module, a frequency synthesis module and a computer control module;
the down-conversion module is used for down-converting the radio frequency signals of the frequency range of 8 GHz-40 GHz into intermediate frequency signals, and the frequency of the intermediate frequency signals is in the intermediate frequency range set by the intermediate frequency signal processing module;
the intermediate frequency signal processing module is used for performing target echo, interference and clutter characteristic modulation on the intermediate frequency signal output by the down-conversion module to obtain intermediate frequency target echo, interference and clutter signals; the intermediate frequency signal processing module can also generate an intermediate frequency radar radiation source signal;
the intermediate frequency signal processing module comprises a broadband signal processing board, and the broadband signal processing board comprises: an analog-to-digital conversion AD sub-card, a digital-to-analog conversion DA sub-card and a signal processing carrier plate;
the intermediate frequency signal is input into the input end of the AD sub-card, and the output end of the AD sub-card is connected with the input end of the signal processing carrier plate through an FMC+ connector;
the output end of the signal processing carrier plate is connected with the input end of the digital-to-analog conversion DA sub-card through an FMC+ connector;
the signal processing carrier plate comprises a main control unit, a high-performance FPGA chip unit, an SDRAM unit, a FLASH unit and a BMC unit;
the digital-to-analog conversion DA sub-card outputs an intermediate frequency signal after digital-to-analog conversion;
the up-conversion module is used for up-converting the intermediate frequency radar radiation source signal, the intermediate frequency target echo, the interference and clutter signal generated by the intermediate frequency signal processing module to a radio frequency matched with an input signal and outputting a radio frequency signal;
the frequency synthesis module is used for generating a frequency synthesis local oscillation signal required by the down-conversion module and the up-conversion module when the down-conversion module and the up-conversion module execute frequency conversion and a reference clock signal required by the platform work;
and the computer control module is used for receiving the control instruction and the parameters issued by the control computer, resolving the control instruction and the parameters in real time, and completing the real-time control of each functional module according to the resolving result.
2. The platform of claim 1, wherein the down conversion module is divided into a plurality of down conversion links, and the operation frequency bands of the down conversion links are sequentially connected from low to high to cover 8 GHz-40 GHz frequency bands, and each down conversion link comprises: an input amplitude control link and a down-conversion sub-module;
the input amplitude control link comprises: a large and small power switching unit and a numerical control attenuator ATT;
the high-low power switching unit includes: 2 single pole double throw change-over switches, a low noise amplifier and a fixed attenuator;
the down-conversion submodule comprises a plurality of frequency conversion submodules which are connected in sequence: the first amplifier, the second mixer, the second filter, the second amplifier, the third mixer, the third filter and the third amplifier;
the method comprises the steps of controlling radio frequency signals selected by 2 single-pole double-throw change-over switches to be input into a numerical control attenuator ATT after passing through a low-noise amplifier path or a fixed attenuation path, and transmitting radio frequency signals output by the numerical control attenuator ATT to a down-conversion submodule after passing through the single-pole single-throw change-over switches;
the intermediate frequency signal is input to the intermediate frequency signal processing module through the selection switch after being subjected to frequency down conversion twice through the second mixer and the third mixer.
3. The platform of claim 2, wherein the digitally controlled attenuator ATT dynamic range is 60dB;
the plurality of down-conversion links is divided into at least three links, including: a high frequency down-conversion link, an intermediate frequency down-conversion link and a low frequency down-conversion link;
the high-frequency down-conversion link and the low-frequency down-conversion link are combined to use the same down-conversion sub-module;
the output of the high-frequency down-conversion link power switching unit is directly input to a down-conversion submodule through 1 single-pole double-throw selection switch;
an up-conversion circuit is arranged between the high-power switching unit of the low-frequency down-conversion link and the single-pole double-throw selection switch, so that radio frequency signals are converted from the frequency band of the low-frequency link to the frequency band of the high-frequency link;
when the high-frequency down-conversion link and the low-frequency down-conversion link are combined and use the same down-conversion submodule, a switch filter bank is arranged behind the single-pole double-throw selection switch.
4. The platform of claim 1, wherein the broadband signal processing board internal transmission rate is not less than 10Gbps;
the AD sub-card sampling rate is 12bit x 9Gsps, and the sampling clock is generated by an external reference clock or directly input by the outside;
the DA sub-card sampling rate is 16bit 9Gsps, and the sampling clock is generated by an external reference clock or directly input by the outside.
5. The platform of claim 1, wherein the up-conversion module receives the intermediate frequency signal output by the intermediate frequency signal processing module, and divides the intermediate frequency signal into a plurality of up-conversion links, the working frequency bands of the up-conversion links are sequentially connected from low to high to cover the frequency bands of 8 GHz-40 GHz, and the intermediate frequency signal output by the intermediate frequency signal processing module is selected to enter the up-conversion links of different frequency bands through a gating switch;
each up-conversion link comprises: up-conversion circuit and output amplitude control circuit
The output amplitude control circuit comprises two stages of radio frequency power amplifiers and a numerical control attenuator ATT which are sequentially connected in series; the output end of the output amplitude control circuit is connected with a single-pole single-throw change-over switch;
each up-conversion circuit comprises a plurality of circuits connected in sequence: the first intermediate frequency filter, the fourth mixer, the second intermediate frequency filter and the fifth mixer are used for transmitting the radio frequency signals output after the up-conversion twice to the output amplitude control circuit through the switch filter bank and the frequency band change-over switch.
6. The platform of claim 5, wherein the plurality of up-conversion links are divided into at least three frequency band outputs, including a high frequency band output, a middle frequency band output, and a low frequency band output;
the low-frequency band output comprises an intermediate down-conversion module, and the intermediate down-conversion module is arranged between an up-conversion circuit of a high-frequency band and an output amplitude control circuit of the low-frequency band and comprises a plurality of down-conversion circuits which are sequentially connected in series: a selector switch, a down-conversion mixer and a switching filter bank convert the output of the high-band up-conversion circuit to a low-band.
7. The platform of any of claims 3 or 6, wherein the plurality of up-conversion links and the plurality of down-conversion links are equally divided into three frequency bands: 8 GHz-18 GHz, 18 GHz-30 GHz and 30 GHz-40 GHz; the output dynamic range of each frequency band is not less than 110dB; the instantaneous bandwidth of the down-conversion module and the up-conversion module is 4GHz.
8. The platform of claim 1, wherein the frequency synthesizer module generates a reference clock signal using a high stability constant temperature crystal oscillator, the reference clock signal generating a multi-path frequency synthesizer local oscillator signal and a working clock signal via a PLL phase lock circuit.
9. The platform of claim 1, wherein the computer control module receives and calculates control instructions issued by an external control computer, and completes real-time control of the down-conversion module, the intermediate frequency signal processing unit, the up-conversion module and the frequency synthesizer module according to the calculation result.
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| CN114966561B (en) * | 2022-07-29 | 2022-11-25 | 成都雷通科技有限公司 | Digital multi-beam phased array radar system for low-altitude warning |
| CN116232426A (en) * | 2022-12-30 | 2023-06-06 | 西安空间无线电技术研究所 | Integrated design method for satellite-borne C/Ku frequency band measurement and control transponder |
| CN117805752A (en) * | 2024-01-31 | 2024-04-02 | 南京雷电信息技术股份有限公司 | Integrated integrated radar signal simulator |
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