CN103675772B - A kind of Multifunctional SAR complex electromagnetic environment simulator - Google Patents
A kind of Multifunctional SAR complex electromagnetic environment simulator Download PDFInfo
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Abstract
A kind of Multifunctional SAR complex electromagnetic environment simulator, comprises antenna and microwave subsystem, base band interfere information produces and modulating unit, control display and model unit.Antenna and microwave subsystem obtain SAR radar emission signal, export to base band interfere information after carrying out power adjustment and multiple stage downconversion to produce and modulating unit, base band interfere information is produced and frequency interference signal in modulating unit output simultaneously, after carrying out multistage up-conversion and power control, export to SAR radar.The generation of base band interfere information and modulating unit, according to the control command received and parameter, calculate the baseband modulation information producing multiple interference type in real time, baseband modulation information and if radar signal are produced required undesired signal after ovennodulation.Control display and model unit to call interference model and produce interference parameter according to simulating requirement and deliver to base band interfere information and produce and modulating unit, the running status of whole analogue means is monitored and reference record simultaneously.
Description
Technical field
The invention belongs to the communications field, relate to a kind of SAR electromagnetic environmental simulator.
Background technology
Synthetic-aperture radar (english abbreviation is SAR) has the features such as round-the-clock, round-the-clock detection imaging and strong perspectivity, high resolving power, good antijamming capability, and these features make SAR be widely used at aerospace field.In actual use, SAR may face from the complex electromagnetic environment interference in space environment, therefore before the sizing of SAR product technology state, need carry out test examination to its electromagnetic environment adaptive faculty.
For SAR, the adaptability of complex electromagnetic environment is examined at present, hangs mainly through aircraft outfield and fly to fly isotype in fact with aerospace vehicle, experimentation cost is high, spend huge.The technical literature abroad published there is no the relevant report that SAR electromagnetic environment adaptability examines indoor equivalent substitution technique study.In domestic technique document, in November, 2010 is published in " defense technology basis " " Design and Analysis of radar interference simulator " sets forth a kind of composition and basic functional principle of radar interference simulator from ultimate principle, but it describes comparatively simple, and do not carry out comprehensive covering of complex electromagnetic environment for the mode of operation of SAR and feature.
Therefore, carry out the embody rule of complex electromagnetic environment adaptability equivalence examination in indoor for SAR, need to research and develop a kind of equivalent simulation device, by applying the interference of different types of electromagnetic environment, examination SAR is specifying the adaptive capacity to environment in interference type or many interference types superposition situation.
Summary of the invention
Technology of the present invention is dealt with problems and is: overcome the deficiencies in the prior art, provide a kind of Multifunctional SAR complex electromagnetic environment simulator, according to mode of operation and the scenario parameters of SAR, transmitting of real-time reception radar, simulate by the mode of space radiation or straight feedback cable couples the spatial electromagnetic undesired signal superposed from different directions, all kinds, the Anti-jamming effectiveness for SAR is tested.
Technical solution of the present invention is: a kind of Multifunctional SAR complex electromagnetic environment simulator, comprises antenna and microwave subsystem, base band interfere information produces and modulating unit, the real-time figure collecting unit of SAR, control to show and model unit, wherein:
Antenna and microwave subsystem: comprise electromagnetic horn, radio-frequency cable, AGC unit, multiple stage downconversion unit, frequently combine unit, multistage upconverting unit, power adjustment unit; SAR radar emission signal delivers to AGC unit by electromagnetic horn space-reception or by radio-frequency cable, AGC unit delivers to multiple stage downconversion unit after carrying out power adjustment to SAR radar emission signal, and multiple stage downconversion unit obtains if radar signal and export to base band interfere information after carrying out two-stage down coversion to the SAR radar emission signal after power adjustment producing and modulating unit; Power adjustment unit is delivered to after multistage upconverting unit produces base band interfere information and in modulating unit generation, frequency interference signal carries out two-stage up-conversion, power adjustment unit obtains Radio Frequency Interfere after carrying out power adjustment to frequency interference signal in after up-conversion, and Radio Frequency Interfere delivers to SAR radar by electromagnetic horn space radiation or by radio-frequency cable; Frequently combine unit and provide frequency signal needed for work for multistage upconverting unit and multiple stage downconversion unit, to produce for base band interfere information and modulating unit provides work clock;
Base band interfere information produces and modulating unit: comprise instantaneous frequency measurement unit, the real-time computing unit of interfere information, interfere information modulated in real time unit; The real-time computing unit of interfere information shows according to controlling the interference parameter transmitted with model unit, produces the baseband modulation information of corresponding interference type; Instantaneous frequency measurement unit obtains the frequency of if radar signal by the method for digital Frequency Measuring; In needed for baseband modulation information produces after ovennodulation according to the frequency of if radar signal and if radar signal by interfere information modulated in real time unit, frequency interference signal is delivered to base band interfere information and is produced and modulating unit;
The real-time figure collecting unit of SAR: by LVDS interface SAR realtime graphic and deliver to control display and model unit;
Control display and model unit: comprise interface control and display unit, interference model unit; Interference model unit stores compacting interference model, cheating interference model, relevant interference model, decoy jamming model, noise jamming model, calls corresponding interference model produce corresponding interference parameter and deliver to the real-time computing unit of interfere information according to the disturbed condition of outside input; The power of disturbed condition to power adjustment unit according to outside input controls; The image generate under disturbed condition SAR radar and real image are compared, and obtain SAR interference effect; The running status of whole analogue means is monitored and reference record.
Described multiple stage downconversion unit comprises two frequency mixer, automatic gain control device, low-pass filter; 12 ~ 18GHz radiofrequency signal of SAR radar emission carries out first order down coversion with the local oscillation signal frequently combining frequency range 12 ~ 16GHz that unit provides by the first frequency mixer, obtains 2GHz first intermediate-freuqncy signal; First intermediate-freuqncy signal is carried out after automatic growth control through automatic gain control device, carry out second level down coversion by the second frequency mixer and the local oscillation signal mixing of frequently combining the 2.5GHz that unit provides, the signal after the down coversion of the second level obtains the if radar signal of 500 ± 250MHz after low-pass filter.
Described multistage upconverting unit comprises two frequency mixer, bandpass filter, switch filter group, two amplifiers and attenuator, middle frequency interference signal obtains the signal of 2GHz frequency with 2.5GHz local oscillation signal mixing in three-mixer that comprehensive unit provides frequently, the signal of 2GHz frequency is by delivering to the 4th frequency mixer after band-pass filter and the amplification of the first amplifier, in the 4th frequency mixer, the signal of 2GHz centre frequency obtains with 12 ~ 16GHz local oscillation signal mixing that comprehensive unit provides frequently the signal that centre frequency is 12 ~ 18GHz, signal bandwidth is the M signal of 500MHz, M signal is by being met 12 ~ 18GHz signal of purity requirement after the corresponding frequency range of switch filter group filtering, 12 ~ 18GHz the signal meeting purity requirement obtains required Radio Frequency Interfere successively after programmable attenuator carries out decay and the second amplifier carries out power amplification.
The present invention's advantage is compared with prior art:
(1) interference model produces with base band interfere information and modulating unit is separated by apparatus of the present invention, interference model can separate configurations, jamming signal type is many, interference type can be selected flexibly, and the simulation of the combined type undesired signal that suppress interfere, cheating interference, relevant interference, noise jamming and decoy jamming five type are disturbed can be realized simultaneously, form complex electromagnetic environment, effectively reduce volume and the cost of hardware device simultaneously;
(2) undesired signal that apparatus of the present invention are simulated injects by radio frequency or the mode of space radiation is received by radar, use-pattern is flexible, interfering signal power can flexible configuration according to the actual requirements, effectively the action effect of various jamming emitter under the various operating distance of simulation;
(3) apparatus of the present invention possess SAR real time image collection function, under assessment, the various electromagnetic environment of comparison, SAR image Output rusults provides condition;
(4) the present invention is according to the feature of SAR bandwidth of operation ultra-wide, frequently combine based on broadband the two-stage local oscillation signal radio frequency signal exported and carry out multiple stage downconversion control, multistage upconversion process, to make equipment adapt to wider frequency band range, ensure that system provides higher spurious reduction level in ultra wide band frequency simultaneously.
Accompanying drawing explanation
Fig. 1 is the theory of constitution block diagram of apparatus of the present invention;
Fig. 2 is the theory of constitution block diagram of multiple stage downconversion unit of the present invention;
Fig. 3 is the theory of constitution block diagram of the multistage upconverting unit of the present invention;
Fig. 4 is the theory of constitution block diagram that the present invention combines unit frequently;
Fig. 5 is SAR of the present invention real-time figure collecting unit composition schematic diagram.
Embodiment
As shown in Figure 1, Multifunctional SAR complex electromagnetic environment simulator of the present invention is made up of following subsystem: antenna and microwave subsystem, base band interfere information produces and modulating unit, the real-time figure collecting unit of SAR, control to show and model unit.
Antenna and microwave subsystem adjust primarily of electromagnetic horn, radio-frequency cable, multiple stage downconversion, AGC, multistage up-conversion, power, power splitter, frequently the module such as to combine and form.The major function of this subsystem has two parts, Part I obtains SAR radar emission signal by the mode of space-reception or line feedback, and power adjustment and multiple stage downconversion are carried out to this signal, then if radar signal is exported to base band interfere information and produce and modulating unit.Base band interfere information produces and frequency interference signal in modulating unit output by Part II, carries out multistage up-conversion and power control, then by the mode that aerial radiation or line are presented, exports to tested SAR radar.
Base band interfere information produces and modulating unit comprises instantaneous frequency measurement, interfere information and calculates in real time and several ingredient such as interfere information modulated in real time.According to the control command received and parameter, the real-time computing module of interfere information can produce the baseband modulation information of multiple interference type, comprises suppress interfere, cheating interference, relevant interference, noise jamming and decoy jamming; Instantaneous frequency measurement can provide the frequency of if radar signal by digital Frequency Measuring algorithm, digital Frequency Measuring algorithm is see " the broadband single-bit instantaneous frequency measurement reception technique based on Real-time digital signal processing " that be published in " marine electronic antagonism " in March, 2012; Interfere information modulated in real time module is used for the if radar signal frequency information of the interfere information calculated in real time and instantaneous frequency measurement gained after ovennodulation, produce required undesired signal, and it comprises the links such as broadband signal AD collection, Digital Down Convert, the modulation of base band interfere information, Digital Up Convert and broadband DA.
The real-time figure collecting unit of SAR is by LVDS interface SAR realtime graphic, and the image that can generate under disturbed condition radar and real image are compared, and is assessed SAR interference effect by interference evaluating software.
Control display to form primarily of interface control and display and interference model two major parts with model unit.The parameter of the various types of interfere informations needed for interference model calculates according to interface parameters, and parameter is handed down to the generation of base band interfere information and modulating unit; According to the parameter such as jamming power, undesired signal frequency arranged, antenna and microwave subsystem are controlled; The running status of whole analogue means is monitored and reference record.
The principle of work of system is: before emulation starts, operator is by controlling display and interference model unit, complete the setting of interfering well cluster and interference parameter, interference model, according to the parameter arranged and corresponding model, generates control command and exports to the generation of base band interfere information and modulating unit.Antenna and microwave sub-system, adopt the mode receiving radar radiofrequency signal of empty feedback or line feedback, and lower powered radar radiofrequency signal, after overpower adjustment, is carried out down-converted and obtained radar intermediate frequency signal to carry out the collection of signal.Base band interfere information produces and modulating unit utilizes A/D to gather radar signal, by after instantaneous frequency measurement, Digital Down Convert for carrying out convolution with interference parameter, interference parameter calculates (compacting interference etc. directly produce according to model, need not carry out convolution) according to control command primarily of the real-time computing module of interfere information.Generate undesired signal after convolution after D/A conversion, export to antenna and microwave subsystem, complete up-conversion by antenna and microwave subsystem and filtering, power amplification and power control, to present finally by line or the mode of space radiation exports to tested radar.The real-time figure collecting unit of SAR, by LVDS interface SAR realtime graphic, is assessed SAR interference effect.
As shown in Figure 2, be the composition frame chart of multiple stage downconversion unit in antenna and microwave subsystem.The local oscillation signal of 12 ~ 18GHz radiofrequency signal that SAR launches and frequency range 12 ~ 16GHz carries out first order down coversion, obtains 2GHz first intermediate-freuqncy signal; First intermediate-freuqncy signal, after automatic growth control, carries out second level down coversion, with local oscillation signal mixing, the low-pass filtering of 2.5GHz, obtains 500 ± 250MHz second intermediate-freuqncy signal (if radar signal), is supplied to base band interfere information and produces and modulating unit.
As shown in Figure 3, multistage upconverting unit is used for frequency interference signal in the generation of base band interfere information and modulating unit to be converted to Radio Frequency Interfere, and controls interfering signal power.First order frequency conversion, the local oscillation signal mixing of middle frequency interference signal and 2.5GHz obtains the signal of 2GHz frequency; In the frequency conversion of the second level, after the signal of 2GHz centre frequency amplifies after filtering with carry out 12 ~ 16GHz local oscillation signal mixing that self-frequency combines and obtain the signal that centre frequency is 12 ~ 18GHz, signal bandwidth is 500MHz, then by the corresponding frequency range of switch filter group filtering, namely the signal of 12 ~ 18GHz of the required purity of frequency spectrum can be obtained, eventually pass program control adjustable attenuation and power amplification, just can obtain required Radio Frequency Interfere.
As shown in Figure 4, the synchronizing signal utilizing SAR is combined in broadband frequently, the variable bandwidth local oscillator providing the generation of base band interfere information and the synchronous clock needed for modulating unit and frequency conversion link to need and intermediate frequency; Also the crystal oscillator that carries can be utilized to provide synchronous clock and local oscillator and intermediate frequency as benchmark.Broadband is frequently combined and is adopted mixing phaselock technique, and wherein produce little stairstep signal with reference to phaselocked loop, signal inputs main phaselocked loop after treatment; Local oscillator ring produces large stairstep signal, inputs main ring with after four divided output signal mixing of RF Voltage-Controlled Oscillator; Main ring controls the frequency range that phase-locked polarity selects locking, produces voltage signal Vt and controls RF Voltage-Controlled Oscillator; Voltage controlled oscillator output signal, after frequency multiplication and Frequency Band Selection, exports through amplifier balanced device.Amplifier is used for amplifying signal and providing certain power, and balanced device ensures the flatness of signal in bandwidth.
The ultrabroad band double-ridged horn antenna that antenna is selected has extremely wide frequency bandwidth, high gain.Frequency coverage is greater than an octave.
Base band interfere information produces and modulating unit gathers the Low Medium Frequency radar emission broadband signal that multiple stage downconversion unit exports, and carries out instantaneous frequency measurement, Digital Down Convert, and with interfere information convolution, Digital Up Convert, DA export Low Medium Frequency undesired signal; Produce compacting undesired signal, comprise aiming formula noise, barrage noise interference, sweep-frequency Békésy audiometer noise, cover impulse disturbances, this type of signal and radar emission signal have nothing to do; Produce relevant interference signal, comprise Convolution Noise, Doppler noise and intensively to copy, this type of signal and radar emission signal correction; Produce cheating interference signal, comprise point target and Area Objects, this type of signal and radar emission signal correction; Produce chaff and land clutter undesired signal, this type of signal and radar emission signal coherence.
Base band interfere information produces and modulating unit controls to receive if radar signal, becomes through analog to digital conversion, Digital Down Convert the baseband signal including SAR signal characteristic; The real-time computing module of interfere information receives interference signal parameters, generates and suppresses interference, relevant, cheating interference model accordingly; Under the control of synchronous clock, the real-time computing module of interfere information utilizes the interference model generated to modulate the baseband signal including SAR signal characteristic, obtains the baseband interference signal that can play interference effect to SAR; Baseband interference signal obtains middle frequency interference signal after Digital Up Convert, digital-to-analog conversion, delivers to follow-up multistage upconverter.
As shown in Figure 5, the real-time figure collecting unit of SAR adopts LVDS interface to adopt the high-speed high capacity realtime image data of SAR output, and LVDS interface chip clock frequency is 12MHz, and bus transfer code check is 144Mbps.
Controlling display with the effect of model unit is control the undesired signal type simulated, undesired signal frequency and power etc., and can monitor and reference record the running status of whole device; And various types of interfere information calculating parameters that interference model will calculate according to interface parameters needed for Base Band Unit work.
Below various interference model is described in detail.
1, compacting interference
Compacting interference comprises aiming formula noise, barrage noise interference, sweep-frequency Békésy audiometer noise, covers impulse disturbances and comb spectrum interference.Thin shape is composed interference model and is realized with reference to " the comb spectrum interference simulation without carrier frequency ULTRA-WIDEBAND RADAR is studied " being published in " Computer Simulation " in June, 2008, and the compacting interference models such as barrage noise interference, aiming formula noise, sweep-frequency Békésy audiometer noise, covering impulse disturbances were with reference to University of Electronic Science and Technology's master thesis " the radar active interference generation technical research based on FPGA " in 2010.
2, relevant interference
Relevant interference signal comprises Convolution Noise, Doppler noise and intensively copies interference.
Convolution Noise interference model realizes with reference to " Convolution Jamming Technique to linear FM radar " being published in " electronics and information journal " in June, 2007.Traditional noise interferences due to radar signal processor mismatch, cause most of interfering energy by matched filter filtering, interference effect reduced.Convolution Noise is by baseband noise and impulse radar signal convolution, obtains Convolution Noise signal, then up-conversion exports.The fundamental purpose done like this be noise decrease undesired signal by the energy loss after matched filter, and then hide the echoed signal after pulse compression, affect subsequent detection.Convolution Noise can make full use of interfering energy, can produce better interference effect under the input of lower power to chirp-pulse compression radar.
Doppler noise interference model realizes with reference to " based on the Doppler noise of narrow band noise phase modulation to the interference analysis of PD radar " being published in " electronic information countermeasure techniques " in April, 2010.When realizing, Doppler noise signal bandwidth is 5MHz to the maximum, and 250MHz is relatively little for bandwidth opposed platforms system clock, after the specific bandwidth white Gaussian noise of generation, in order to reach the sampling rate of 250MHz, need to carry out interpolation filter process to band limited white noise.Because interpolation multiple is higher, in order to save hardware logic resource, use the integral comb filter of cascade here to realize.
Doppler noise interference model was with reference to University of Electronic Science and Technology's master thesis " the radar active interference based on FPGA produces technical research " realization in 2010.Intensive the copying of decoy disturbs the mode of employing delay stack to target at distance upwards coverage goal echo, and undesired signal upwards can obtain processing gain in distance, covers real goal, reaches wire interference effect.The intensive mode copied realizes, and uses time delay module, sense data after postponing a period of time, and the target copied is just different apart from upper from former target.In single RRI, intensive copy pulse number is 100, and distance is uniformly distributed, and Doppler is identical, and amplitude is identical.
3, duplicity interference
Duplicity interference model realizes with reference to " model investigation of SAR active deception " being published in " modern defense technology " in August, 2009.Duplicity interference is mainly according to the producing method of SAR target echo, generate angel echoes, when after reception SAR radar emission signal, directly decoy response is transmitted to radar, making to be mixed with in SAR radar return signal must decoy information, after general SAR imaging processing, form SAR decoy or image.
Disturb for point target, in implementation procedure, each target in dot matrix can regard an independently SAR point target as, each target carries out independently phase-modulation, target travel is according to uniformly accelrated rectilinear motion process, completed the interpolation arithmetic of target trajectory by FPGA, final for multiple independent point target weighting is exported and obtains the simulation of dot matrix target echo signal.
Disturb for Area Objects, consider that SAR Area Objects simulated scatter point number is more, according to common point target implementation, FPGA is realized being unpractical, therefore require to pre-set current PRI(pulse recurrence interval to the realization of Area Objects) and PRI remain unchanged, obtain current analogue system Echo transfer function, system real-time playback upgrades Echo transfer function, then by obtaining base band target echo signal with radar baseband signal convolution.Radar baseband signal needed for real-time convolution by gather radar intermediate frequency signal, then carry out Digital Down Convert and FFT(Fast Fourier Transform (FFT)) process obtain.
4, land clutter interference
Land clutter interference model realizes with reference to " the Clutter simulation model in radar signal simulator " being published in " aerospace electronic warfare " in June, 2003.Clutter refers to the echo component caused due to volume scattering or surface scattering comprised in Received signal strength in radar.For the simulation of noise jamming, the mode usually adopting base band echoed signal and Clutter Model data to carry out real-time convolution produces.Produce base band clutter data according to model, under the triggering of detection pulse, carry out convolution with transmitting of receiving.For the simulation modelling of clutter, can be portrayed by the probability density function of the Radar Cross Section of clutter and scattered power change.Clutter can be divided into according to amplitude statistics model: Rayleigh, Weibull, log-normal, K, can be divided into according to power spectrum: Gaussian spectrum, Ke Xipu, cube spectrum.
5, decoy jamming
" a kind of modeling and simulation method of Chaff Cloud Echo " that decoy jamming model reference is published in " modern radar " in August, 2006 realizes.In order to produce decoy jamming signal more easily, need the echo model further simplifying chaff signal, utilize simple means to reappear chaff echo signal all as characteristic, comprise distance time delay, distance diffusion, echo power fluctuating, Doppler shift, Doppler spread, transmit form etc.This realization thinks that chaff cloud is made up of multiple small cubes, and the movement velocity of each small cubes is not consistent, the fluctuating of a speed will be had, think this fluctuating Normal Distribution here, the Doppler shift that the velocity fluctuation that so just can obtain each small cubes causes, this echo of little cube can be produced with that, finally the echo of all little cube is added the echoed signal just obtaining chaff cloud entirety.
When reality uses, the analogue means that multiple stage the present invention can be adopted to propose, is coordinated by networking, the spatial electromagnetic undesired signal of simulation different directions, all kinds superposition.
The content be not described in detail in instructions of the present invention belongs to the known technology of those skilled in the art.
Claims (3)
1. a Multifunctional SAR complex electromagnetic environment simulator, is characterized in that: comprise antenna and microwave subsystem, base band interfere information produces and modulating unit, the real-time figure collecting unit of SAR, control to show and model unit, wherein:
Antenna and microwave subsystem: comprise electromagnetic horn, radio-frequency cable, AGC unit, multiple stage downconversion unit, frequently combine unit, multistage upconverting unit, power adjustment unit; SAR radar emission signal delivers to AGC unit by electromagnetic horn space-reception or by radio-frequency cable, AGC unit delivers to multiple stage downconversion unit after carrying out power adjustment to SAR radar emission signal, and multiple stage downconversion unit obtains if radar signal and export to base band interfere information after carrying out two-stage down coversion to the SAR radar emission signal after power adjustment producing and modulating unit; Power adjustment unit is delivered to after multistage upconverting unit produces base band interfere information and in modulating unit generation, frequency interference signal carries out two-stage up-conversion, power adjustment unit obtains Radio Frequency Interfere after carrying out power adjustment to frequency interference signal in after up-conversion, and Radio Frequency Interfere delivers to SAR radar by electromagnetic horn space radiation or by radio-frequency cable; Frequently combine unit and provide frequency signal needed for work for multistage upconverting unit and multiple stage downconversion unit, to produce for base band interfere information and modulating unit provides work clock;
Base band interfere information produces and modulating unit: comprise instantaneous frequency measurement unit, the real-time computing unit of interfere information, interfere information modulated in real time unit; The real-time computing unit of interfere information shows according to controlling the interference parameter transmitted with model unit, produces the baseband modulation information of corresponding interference type; Instantaneous frequency measurement unit obtains the frequency of if radar signal by the method for digital Frequency Measuring; In needed for baseband modulation information produces after ovennodulation according to the frequency of if radar signal and if radar signal by interfere information modulated in real time unit, frequency interference signal is delivered to base band interfere information and is produced and modulating unit;
The real-time figure collecting unit of SAR: by LVDS interface SAR realtime graphic and deliver to control display and model unit;
Control display and model unit: comprise interface control and display unit, interference model unit; Interference model unit stores compacting interference model, cheating interference model, relevant interference model, decoy jamming model, noise jamming model, calls corresponding interference model produce corresponding interference parameter and deliver to the real-time computing unit of interfere information according to the disturbed condition of outside input; The power of disturbed condition to power adjustment unit according to outside input controls; The image generate under disturbed condition SAR radar and real image are compared, and obtain SAR interference effect; The running status of whole analogue means is monitored and reference record.
2. a kind of Multifunctional SAR complex electromagnetic environment simulator according to claim 1, is characterized in that: described multiple stage downconversion unit comprises two frequency mixer, automatic gain control device, low-pass filter; 12 ~ 18GHz radiofrequency signal of SAR radar emission carries out first order down coversion with the local oscillation signal frequently combining frequency range 12 ~ 16GHz that unit provides by the first frequency mixer, obtains 0 ~ 2GHz first intermediate-freuqncy signal; First intermediate-freuqncy signal is carried out after automatic growth control through automatic gain control device, carry out second level down coversion by the second frequency mixer and the local oscillation signal mixing of frequently combining the 2.5GHz that unit provides, the signal after the down coversion of the second level obtains the if radar signal of 500 ± 250MHz after low-pass filter.
3. a kind of Multifunctional SAR complex electromagnetic environment simulator according to claim 1, is characterized in that: described multistage upconverting unit comprises two frequency mixer, bandpass filter, switch filter group, two amplifiers and attenuator, middle frequency interference signal obtains the signal of 2GHz frequency with 2.5GHz local oscillation signal mixing in three-mixer that comprehensive unit provides frequently, the signal of 2GHz frequency is by delivering to the 4th frequency mixer after band-pass filter and the amplification of the first amplifier, in the 4th frequency mixer, the signal of 2GHz centre frequency obtains with 12 ~ 16GHz local oscillation signal mixing that comprehensive unit provides frequently the signal that centre frequency is 14 ~ 18GHz, signal bandwidth is the M signal of 500MHz, M signal is by being met 14 ~ 18GHz signal of purity requirement after the corresponding frequency range of switch filter group filtering, 14 ~ 18GHz the signal meeting purity requirement obtains required Radio Frequency Interfere successively after programmable attenuator carries out decay and the second amplifier carries out power amplification.
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