CN101135726A - Satellite carried SAR inner marking signal processing platform system and realization method thereof - Google Patents
Satellite carried SAR inner marking signal processing platform system and realization method thereof Download PDFInfo
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Abstract
The platform thereof comprises 6 modules which are: a data extracting module, a stability calibrating module, a phase error calibrating module, a TR assembly frequency domain scaling module, a reliability checking module and a analysis result interpreting module. The method uses a parallel process approach to process the internal calibration signals.
Description
Technical field
The invention belongs to the signal Processing field, relate to a kind of signal processing platform, particularly a kind of satellite carried SAR inner marking signal processing platform.
Background technology
The synthetic aperture radar (SAR) satellite developed rapidly in the last few years, because the SAR satellite is not subjected to the restriction of factors such as weather, geography, time, can carry out the observation of round-the-clock over the ground, and have certain penetration power, thereby be widely used in aspects such as military surveillance, resource detection, oceanographic observation, ecological monitoring.
In radar internal transmission process, in order to enlarge the application of SAR, obtain sharpness height, visual high SAR remote sensing images, need the echoed signal of compensation radar.But because the imperfection of radar internal components can cause the distortion of signal amplitude and phase place, and to compensate the error that this distortion brings, to measure the transport function of whole radar inside earlier, must guarantee at first that then radar is in normal duty, otherwise will there be bigger error in the transport function that records, and causing satellite will be very limited also to the compensation of error ability that distortion produces.A defective in this interior at present just calibration signal processing has promptly been ignored radar and has been in this prerequisite of normal operating conditions.
At present, internally the research of rate-aided signal is also less, mainly be the signal amplitude introduced when the radar internal transmission at the compensation radar echo signal and the distortion of phase place, and some follow-up researchs, and whether the radar duty is judged normally that this respect belongs to blank substantially.The at present domestic method that all adopts a kind of three loop signals calibration basically.Calibrate loops for three and be meant emission calibration loop, receive calibration loop and reference calibration loop.Launch the calibration loop and finish the sampling of emission being calibrated loop signal, analyze the waveform of launching circuit signal, gain, the stability of mensuration transmission channel, and obtain the transport function in emission calibration loop; Receive the calibration loop and finish, analyze the waveform of receiving loop signal, measure and receive calibration loop front-end gain and stability thereof, obtain the transport function that receives the calibration loop receiving the sampling of calibration loop signal; Finish the duplicating of reference rate-aided signal with reference to the calibration loop, obtain transport function with reference to the calibration loop.
A common ground of these disposal routes is exactly the transport function that will obtain each loop, but before the transport function of obtaining these loops is handled, data are not done any pre-service, the duty of radar is not analyzed, thereby the transport function reliability of obtaining, precision are not high yet.
Summary of the invention
The purpose of this invention is to provide a kind of satellite carried SAR inner marking signal processing platform system and implementation method, its process object is the satellite carried SAR inner marking signal, the valid data abstraction module is to the extraction of effectively interior rate-aided signal during by input signal, and the certificate authenticity module is calibrated module to stability, card is reflected in the output result contrast of phase error calibration module, adopt the working method of collaborative parallel processing to handle interior rate-aided signal, not only can obtain result more accurately, and can also carry out quantitative description to the radar system duty, have efficient, accurately, complete, the processing feature that reliability is high.
The present invention is a kind of satellite carried SAR inner marking signal processing platform system, comprise effective data extraction module, analysis result reading module, it is characterized in that, also comprise stability calibration module, phase error calibration module, TR assembly frequency domain calibration module and certificate authenticity module.The valid data abstraction module will import with the adjacent pairing comparision of self-adaptation that valid data in the rate-aided signal extract in platform original, and these group valid data are outputed to stability calibration module, phase error calibration module, TR assembly frequency domain calibration module and certificate authenticity module respectively; Stability calibration module is measured the amplitude and the phase place at the signal power peak place after the matched filtering, the duty of reflection radar system, and the phase place after will handling respectively and amplitude information output in the analysis result reading module, and the changes in amplitude curve outputs in the reliability demonstration module; Phase error calibration module adopts high precision orthogonal domain error phase decomposition method that error phase is decomposed, obtain the peak value of each time phase error of quadrature, and each the high order phase error peak-to-peak value after will handling respectively outputs to the analysis result reading module, and each high order phase error matched curve outputs to the reliability demonstration module; TR assembly frequency domain calibration module mainly detects the duty of TR assembly, and the result after will handling outputs to the analysis result reading module; The reliability demonstration functions of modules is the whole platform analysis result correctness of checking, and the result is outputed to the analysis result reading module; Finally analyze all results, thereby judge the duty of radar by the analysis result reading module.
Described valid data abstraction module utilizes the adjacent pairing comparision of self-adaptation to extract valid data.Form by input interface unit, matched filter and output interface unit.Rate-aided signal form is frame by frame imported by input interface unit in original, and enters in pairs and carry out matched filtering in the matched filter; Get the absolute value of difference between the maximal value of power after its matched filtering.If the value of being somebody's turn to do is very little, can directly remove, do not carry out subsequent operation; If should value very big, judge that these two groups of data are valid data, by the output interface unit, signal is outputed to stability calibration module, phase error calibration module, TR assembly frequency domain calibration module, certificate authenticity module; Carry out next processing after disposing to Frame, and repetitive operation, up to handling whole raw data.
Described stability calibration module is carried out matched filtering with interior calibration data, measures the amplitude and the phase place at filtered signal power peak place, analyzes its trend over time.Preserving unit, matched filter, interpolating unit and output interface unit by input interface unit, amplitude characteristic forms.Signal frame by input interface unit divides two-way, enters amplitude characteristic respectively and preserves unit and matched filter, enters amplitude characteristic preservation unit and the signal amplitude of signal frame can be transformed to curve, and be kept in this unit; Output to interpolating unit after entering the signal filtering of matched filter, and near the data of getting the power peak place are carried out interpolation; In interpolating sequence, choose the position of peak value again, obtain the amplitude of this position signalling and phase place and preserve, repeat interpolation operation then, up to the phase change of the maximal value place signal after the matched filtering in the small scope that error allows.The output interface unit passes to the certificate authenticity module with the changes in amplitude curve, and the phase place at power peak place and amplitude are passed to the analysis result reading module.
Described phase error calibration module is removed unit, phase-fitting unit, phase error pretreatment unit, phase error analytic unit and output interface unit by input interface unit, phase place and is formed; Rate-aided signal is removed the unit to phase place in reading in effectively frame by frame from input interface unit, removes in the unit in phase place, and the standard quadratic phase is removed, and remaining is error phase; The output signal that phase place is removed the unit is input to the phase-fitting unit, obtains the phase-fitting curve; Phase-fitting curve negotiating phase error pretreatment unit, obtain the phase error curve, and be input to the phase error analytic unit, obtain the matched curve and the peak-to-peak value of each high order phase error, and matched curve passed to the certificate authenticity module by the output interface unit, peak-to-peak value is passed to the analysis result reading module; Repeat aforesaid operations, the calibration signal Processing finishes in effectively.
Index during described certificate authenticity module is assessed by the reference point target comes the result after the internal rate-aided signal matched filtering to analyze, and injects unit, subtractor unit and output interface unit by input interface unit, matched filter, error and forms; The output result of stability calibration module and phase error calibration module is input to error injection unit and is injected into the ideal linearity FM signal, the composite signal that obtains carries out matched filtering in matched filter, obtain resolution that its resolution, integration secondary lobe obtains through matched filter than, peak sidelobe ratio and interior calibration signal frame, integration secondary lobe than and peak sidelobe ratio relatively, obtain the absolute value of respective differences, and output to the analysis result reading module by the output interface unit; Receive calibration data in the next frame again, repeat aforesaid operations, up to handling the input data.
A kind of satellite carried SAR inner marking signal Processing implementation method is characterized in that, may further comprise the steps:
Step 1: rate-aided signal form frame by frame and is entered in pairs and carries out matched filtering in the matched filter by the input of the input interface unit of valid data abstraction module in original, gets the absolute value of difference between the maximal value of power after its matched filtering; Size according to this value judges whether effectively; By the output interface unit, signal is outputed to stability calibration module, phase error calibration module, TR assembly frequency domain calibration module, certificate authenticity module.
Step 2: the signal frame of calibrating the input interface unit of module by stability enters amplitude characteristic preservation unit and matched filter respectively, enters amplitude characteristic preservation unit and the signal amplitude of signal frame can be transformed to curve, and be kept in this unit; Output to interpolating unit after entering the signal filtering of matched filter, and near the data of getting the power peak place are carried out interpolation; The changes in amplitude curve passes to the certificate authenticity module, and the phase place at power peak place and amplitude pass to the analysis result reading module.
Step 3: rate-aided signal is removed the unit to the phase place of phase error calibration module in reading in effectively, removes the standard quadratic phase, and remaining is error phase and is input to the phase-fitting unit, obtain the phase-fitting curve; Phase-fitting curve negotiating phase error pretreatment unit, obtain the phase error curve, and be input to the phase error analytic unit, obtain the matched curve and the peak-to-peak value of each high order phase error, and matched curve passed to the certificate authenticity module, peak-to-peak value passes to the analysis result reading module.
Step 4: the error that relevant output result is input to the certificate authenticity module is injected the unit, and be injected in the ideal linearity FM signal, the composite signal that obtains carries out matched filtering in matched filter, obtaining its resolution, integration secondary lobe passes through matched filter frame by frame than, peak sidelobe ratio and interior rate-aided signal and obtains corresponding index and compare, obtain the absolute value of respective differences, and output to the analysis result reading module by the output interface unit.
Step 5: rate-aided signal is input to TR assembly frequency domain calibration module effectively, is used for detecting the duty of TR assembly, and the analysis result that the result after will handling and reliability demonstration module verification draw outputs to the analysis result reading module together; Finally analyze the result of all inputs, thereby judge the duty of radar by the analysis result reading module.
Step 6: receive calibration data in the next frame, repeating step 1 is to step 5, up to handling the input data.
The phase place of phase error calibration module is removed in the unit in the described step 3, the ideal linearity FM signal that produces is through getting after conjugation means gets conjugation, calibration signal multiplication in multiplier and effectively, this moment, the standard quadratic phase of output signal was removed, and remaining is error phase.
The treatment step of the phase-fitting unit in the described step 3 in the phase error calibration module is as follows:
A, at first get first sampled point that phase place is removed the output signal of unit, as first point of phase curve.
B, the conjugation of in getting conjugation means, getting this first sampled point, and then second sampled point of multiplier neutralization multiply each other, and gets the phase place of its result of product.
C, the phase place of this phase place and first sampled point by the totalizer addition, as second point of phase curve.
D, repetitive operation finish until all sampled points processing, obtain the phase-fitting curve.
Phase error is calibrated in the phase error pretreatment unit of module in the described step 3, contain process chip and the data of input can be carried out Legendre expansion, the phase-fitting curve negotiating promptly carries out Legendre expansion after importing this unit, obtains phase error and constant term; And utilize subtracter to deduct phase error and constant term, if a phase error peak value less than a threshold value, then this cell processing finishes, and enters the phase error analytic unit; Otherwise proceed the Legendre expansion of this matched curve, repeat above operation.
Certificate authenticity module error is injected the unit in the described step 4, form by a signal generation apparatus and a process chip, process chip is modulated to the phase error of the range error of stability calibration module output and the output of phase error calibration module in the ideal linearity FM signal, obtains composite signal.
The advantage of a kind of satellite carried SAR inner marking signal processing platform system of the present invention and implementation method is:
(1) added the valid data abstraction module, utilized the adjacent pairing comparision technology of self-adaptation simultaneously, improved the treatment effeciency of internal rate-aided signal greatly, efficient is several times of traditional treatment method.
(2) in stability calibration module, data are carried out matched filtering after, adopt loop delay jitter adaptive processing technique, prevent because the shake of communication channel delay causes peaked sampling inaccurate; In phase error calibration module, adopt high precision orthogonal domain error phase decomposition technique that error phase is decomposed, improved the precision of handling greatly.
(3) in the TR assembly frequency domain calibration module, data variation after frequency, is reflected and monitors the performance of TR assembly again, effective more, reliable to the monitoring of TR assembly.
(4) result in stability calibration module, phase error calibration module and these three modules of certificate authenticity contrasts mutually and reflects card, has improved the reliability of result, makes whole platform structure more reasonable, perfect.
Description of drawings
Fig. 1 is the overall construction drawing of a kind of satellite carried SAR inner marking signal processing platform system of the present invention;
Fig. 2 is the valid data abstraction module structural drawing of a kind of satellite carried SAR inner marking signal processing platform system of the present invention;
Fig. 3 is the stability calibration modular structure figure of a kind of satellite carried SAR inner marking signal processing platform system of the present invention;
Fig. 4 is the phase error calibration modular structure figure of a kind of satellite carried SAR inner marking signal processing platform system of the present invention;
Fig. 5 is the certificate authenticity modular structure figure of a kind of satellite carried SAR inner marking signal processing platform system of the present invention;
Fig. 6 is the analysis result reading module processing flow chart of a kind of satellite carried SAR inner marking signal processing platform system of the present invention;
Fig. 7 is the process flow diagram of a kind of satellite carried SAR inner marking signal Processing of the present invention implementation method;
Fig. 8 is the processing flow chart of the phase-fitting unit of phase error calibration module in a kind of satellite carried SAR inner marking signal Processing of the present invention implementation method step 3;
Fig. 9 a is the phase change curve at the stability calibration modular power peak value place of a kind of satellite carried SAR inner marking signal processing platform system of the present invention and implementation method;
Fig. 9 b is the changes in amplitude curve at the stability calibration modular power peak value place of a kind of satellite carried SAR inner marking signal processing platform system of the present invention and implementation method;
Figure 10 is each high order phase error peak-to-peak value change curve of the phase error calibration module output of a kind of satellite carried SAR inner marking signal processing platform system of the present invention and implementation method;
Figure 11 a is the resolution comparison diagram that obtains in the matched filter of certificate authenticity module of a kind of satellite carried SAR inner marking signal processing platform system of the present invention and implementation method;
Figure 11 b is the peak sidelobe ratio comparison diagram that obtains in the matched filter of certificate authenticity module of a kind of satellite carried SAR inner marking signal processing platform system of the present invention and implementation method;
Figure 11 c is that the integration secondary lobe that obtains in the matched filter of certificate authenticity module of a kind of satellite carried SAR inner marking signal processing platform system of the present invention and implementation method compares comparison diagram.
Among the figure: 1. valid data abstraction module 101. input interface units
102. matched filter 103. output interface unit 2. phase errors calibration module
201. input interface unit 202. phase places are removed 203. phase-fitting unit, unit
204. phase error pretreatment unit 205. phase error analytic units 206. output interface unit
3. stability is calibrated module 301. input interface units 302. matched filters 303. interpolating unit
304. amplitude characteristic is preserved 305. output interface unit, unit, 4. certificate authenticity modules
401. input interface unit 402. matched filters 403. subtraction wave filters
404. output interface unit 405. errors are injected unit 5.TR assembly frequency domain calibration module
6. analysis result reading module
Embodiment
The present invention is described in further detail below in conjunction with accompanying drawing.
As shown in Figure 1, the present invention is a kind of satellite carried SAR inner marking signal processing platform.Comprise effective data extraction module 1, analysis result reading module 6, stability calibration module 3, phase error calibration module 2, TR assembly frequency domain calibration module 5 and certificate authenticity module 4.The adjacent pairing comparision of valid data abstraction module 1 usefulness self-adaptation will import that valid data in the rate-aided signal extract in platform original, and these group valid data are outputed to stability calibration module 3, phase error calibration module 2, TR assembly frequency domain calibration module 5 and certificate authenticity module 4 respectively; Stability calibration module 3 is carried out matched filtering with interior calibration data, measure the amplitude and the phase place at filtered signal power peak place, and the phase place after will handling respectively and amplitude information output in the analysis result reading module 6, and the changes in amplitude curve outputs in the reliability demonstration module 4; Phase error calibration module 2 adopts high precision orthogonal domain error phase decomposition method that error phase is decomposed, obtain the peak value of each time phase error of quadrature, and each the high order phase error peak-to-peak value after will handling respectively outputs to analysis result reading module 6, and each high order phase error and matched curve output to reliability demonstration module 4; The TR assembly frequency domain calibration module 5 main duties that detect the TR assembly, and the result after will handling outputs to analysis result reading module 6; Reliability demonstration module 4 functions are the whole platform analysis result correctness of checking, and the result is outputed to analysis result reading module 6; Finally analyze all results, thereby judge the duty of radar by analysis result reading module 6.
As shown in Figure 2, the inlet of whole platform is a valid data abstraction module 1, and data are by behind the valid data abstraction module 1, and invalid interior calibration data only are left effectively interior calibration data by filtering,
Valid data abstraction module 1 is made up of input interface unit 101, matched filter 102 and output interface unit 103.Rate-aided signal form frame by frame is by input interface unit 101 inputs in original, interior calibration frame after the input enters in pairs and carries out matched filtering in the matched filter 102, promptly the interior rate-aided signal of the rate-aided signal and second frame successively exports matched filter 102 to by input interface unit 101 in first frame, get the absolute value of difference between the maximal value of power after its matched filtering, if the difference of absolute value is less than 0.5dB, illustrate that these two frame data are not in the linear amplification zone of amplifier in the loop, and then judge that this two frame is an invalid signals; If the difference absolute value greater than 0.5dB, illustrate that these two frame data are in the linear amplification zone of amplifier in the loop, judge that this two frame signal is a useful signal.If what draw is valid data,, signal is outputed to stability calibration module 3, phase error calibration module 2, TR assembly frequency domain calibration module 5, the certificate authenticity module 4 of back then by output interface unit 103; Otherwise, then abandon this two frame data.The back input interface unit 103 that disposes successively exports rate-aided signal in rate-aided signal in the 3rd frame and the 4th frame to matched filter 102 again, and enter next time and handle, and repetitive operation, up to handling whole raw data.
In the stability calibration module 3,, at first interior calibration data are carried out matched filtering, measure the amplitude and the phase place at filtered signal power peak place, analyze its trend over time in order to improve the robustness of data processing.When variation is very little, judge that this loop works is normal.Along with time, variation of temperature, the time-delay in loop may have subtle change, causes the power peak positional jitter, and it is inaccurate to cause the position to choose, and has used loop delay jitter adaptive processing technique here.
As shown in Figure 3, stability calibration module 3 is made up of input interface unit 301, amplitude characteristic preservation unit 304, matched filter 302, interpolating unit 303 and output interface unit 305.Read in effectively interior calibration data frame by frame from the input interface unit 301 of stability calibration module 3.First frame signal by input interface unit 301 is divided two-way, the first via enters amplitude characteristic and preserves unit 304, because ideally, amplitude is a steady state value, the amplitude that is equivalent to signal is a rectangle, then amplitude characteristic is preserved unit 304 and the amplitude of signal frame can be transformed to curve, and is kept in this unit; The second the tunnel enters matched filter 302, carries out matched filtering, and filtered output is input to interpolating unit 303 and handles, and promptly gets near the data in power peak place and carries out interpolation.In interpolating sequence, choose the position of power peak again, obtain the phase place of this position,, preserve the phase place and the amplitude at power peak place if phase change less than 0.005rad, then finishes the processing in this step, otherwise, interpolation operation repeated.Output interface unit 305 passes to certificate authenticity module 4 with the changes in amplitude curve, and the phase place at power peak place and amplitude are passed to analysis result reading module 6.
In the phase error calibration module 2, used high precision orthogonal domain error phase decomposition technique that error phase is decomposed.
As shown in Figure 4, phase error calibration module 2 is made up of input interface unit 201, phase place removal unit 202, phase-fitting unit 203, phase error pretreatment unit 204, phase error analytic unit 205 and output interface unit 206.Rate-aided signal in reading in effectively frame by frame from input interface unit 201, and will export and be input to phase place frame by frame and remove unit 202, the output signal of phase place removal unit 202 is input to phase-fitting unit 203, obtains the phase-fitting curve.
The phase-fitting curve of phase-fitting unit 203 outputs inputs to phase error pretreatment unit 204, phase error curve after the pre-service is input to phase error analytic unit 205, utilize the Legendre expansion formula, obtain the matched curve of each high order phase error (being generally quadratic phase error to five time phase error) and the peak-to-peak value of each high order phase error, and each high order phase error matched curve passed to certificate authenticity module 4 by output interface unit 206, each high order phase error peak-to-peak value is passed to analysis result reading module 6.Repeat aforesaid operations, the calibration signal Processing finishes in effectively.
TR assembly frequency domain calibration module 5 is analyzed interior rate-aided signal from the angle of frequency domain, by conversion of signals is arrived frequency domain, analyze in the one identical microsecond level period of contrast, amplitude-frequency between the different TR assemblies changes, and the amplitude-frequency of same TR assembly in different time change, and detects the performance of TR assembly.When relatively amplitude-frequency changed, the mean value of getting a bit of spectral magnitude in the passband usually compared, and in this way, can both obtain satisfied result on processing speed and precision.
The function of certificate authenticity module 4 mainly is the whole platform analysis result correctness of checking.It comes the result after the internal rate-aided signal matched filtering to analyze by using for reference some indexs in the point target assessment, obtains its resolution, integration secondary lobe and compares checking with range error that obtains previously and phase error then than, peak sidelobe ratio.
As shown in Figure 5, certificate authenticity module 4 is injected unit 405, subtractor unit 403 and output interface unit 404 by input interface unit 401, matched filter 402, error.By input interface unit 401, read in the effectively interior output result who calibrates data and stability calibration module 3 and phase error calibration module 2 frame by frame, interior calibration signal frame is imported matched filter 402, obtains its resolution, integration secondary lobe ratio and peak sidelobe ratio; The output result of stability calibration module 3 and phase error calibration module 2 is input to error and injects unit 405, the vv error is injected unit 405 and is made up of a signal generation apparatus and a process chip, process chip is modulated to the phase error of range error in 3 outputs of stability calibration module and 2 outputs of error phase calibration module in the ideal linearity FM signal, and the composite signal of the error injection module that obtains 405 outputs carried out matched filtering in matched filter 402, obtain its resolution, integration secondary lobe too than, peak sidelobe ratio.These two groups of indexs by subtractor unit 403, are obtained the absolute value of resolution, integration secondary lobe ratio and peak sidelobe ratio respective differences respectively, and the result is passed through output interface unit 404, will output to analysis result reading module 6.Receive calibration data in the next frame, repeat aforesaid operations, up to handling all data.
Analysis result reading module 6 receives the data stream of autostability calibration module 3, phase error calibration module 2, TR assembly frequency domain calibration module 5, reliability demonstration module 4.The function of this module mainly is that the result who handles is analyzed, and judges the duty of radar.
As shown in Figure 6, output result for stability calibration module 3 verification units, analyze the phase change and the changes in amplitude at each frame data power peak place, if changes in amplitude fluctuation less than 0.5dB then belong to normal, the phase change fluctuation is a normal condition during less than 3 °;
For the output result of phase error calibration verification unit 2, if quadratic phase error less than 10 °, other high order phase errors are normal condition during less than 6 °;
For the output result of TR assembly frequency domain calibration module 5,, then be normal condition if spectrum amplitude changes fluctuation less than 0.5dB;
Comparing result according to two groups of indexs that obtain in the reliability detection module 4 comprises: resolution, integration secondary lobe ratio and peak sidelobe ratio, if the difference of corresponding index, illustrates that analysis result is correct below 5%; Otherwise, check stability calibration module 3 and phase error calibration module 2.
If These parameters is all qualified, then the radar duty is normal, can carry out the measurement of ssystem transfer function, otherwise, return corresponding module and check.
A kind of satellite carried SAR inner marking signal Processing implementation method as shown in Figure 7, may further comprise the steps:
Step (1): rate-aided signal form frame by frame and is entered in pairs and carries out matched filtering in the matched filter 102 by input interface unit 101 input of valid data abstraction module 1 in original, gets the absolute value of difference between the maximal value of power after its matched filtering; If the value of being somebody's turn to do is very little, can directly remove, do not carry out subsequent operation; If should value very big, judge that these two groups of data are valid data, by output interface unit 103, signal is outputed to stability calibration module 3, phase error calibration module 2, TR assembly frequency domain calibration module 5, certificate authenticity module 4.
Step (2): the signal frame of calibrating the input interface unit 301 of module 3 by stability divides two-way, enter amplitude characteristic respectively and preserve unit 304 and matched filter 302, enter amplitude characteristic preservation unit 304 and the signal amplitude of signal frame can be transformed to curve, and be kept in this unit; Output to interpolating unit 303 after entering the signal filtering of matched filter 302, and near the data of getting the power peak place are carried out interpolation; In interpolating sequence, choose the position of peak value again, obtain the amplitude of this position signalling and phase place and preserve, repeat interpolation operation then, up to the phase change of the maximal value place signal after the matched filtering in the small scope that error allows; Output interface unit 305 passes to certificate authenticity module 4 with the changes in amplitude curve, and the phase place at power peak place and amplitude are passed to analysis result reading module 6.
Step (3): read in effectively interior rate-aided signal frame by frame to phase place removal unit 202 from the input interface unit 201 of phase error calibration module 2, remove in the unit 202 in phase place, the standard quadratic phase is removed, and remaining is error phase; The output signal that phase place is removed unit 202 is input to phase-fitting unit 203, obtains the phase-fitting curve; Phase-fitting curve negotiating phase error pretreatment unit 204, obtain the phase error curve, and be input to phase error analytic unit 205, obtain the matched curve and the peak-to-peak value of each high order phase error, and matched curve passed to certificate authenticity module 4 by output interface unit 206, peak-to-peak value is passed to analysis result reading module 6.
Step (4): the error injection unit 405 that the output result of stability calibration module 3 and phase error calibration module 2 is input to certificate authenticity module 4 is injected into the ideal linearity FM signal, the composite signal that obtains carries out matched filtering in matched filter 402, obtain resolution that its resolution, integration secondary lobe obtains through matched filter frame by frame than, peak sidelobe ratio and interior rate-aided signal, integration secondary lobe than and peak sidelobe ratio relatively, obtain the absolute value of respective differences, and output to analysis result reading module 6 by output interface unit 404.
Step (5): rate-aided signal is input to TR assembly frequency domain calibration module 5 effectively, is used for detecting the duty of TR assembly, and the result after will handling and reliability demonstration module 4 verify that the analysis result that draws outputs to analysis result reading module 6 together; Finally analyze the result of all inputs, thereby judge the duty of radar by analysis result reading module 6.
Step (6): receive calibration data in the next frame, repeating step (1) is to step (5), up to handling the input data.
The phase place of phase error calibration module 2 is removed in the unit 202 in the step (3), the ideal linearity FM signal that produces is through getting after conjugation means gets conjugation, calibration signal multiplication in multiplier and effectively, this moment, the standard quadratic phase of output signal was removed, and remaining is error phase.
As shown in Figure 8, the treatment step of phase-fitting unit 203 is as follows in the step (3):
A, at first get first sampled point that phase place is removed the output signal of unit 203, and get its phase place, as first point of phase curve.
B, the conjugation of in getting conjugation means, getting this first sampled point, and then second sampled point of multiplier neutralization multiply each other, and gets the phase place of its result of product.
C, the phase place of this phase place and first sampled point by the totalizer addition, as second point of phase curve.
D, repetitive operation finish until all sampled points processing, obtain the phase-fitting curve.
Contain process chip in the phase error pretreatment unit 204 of phase error calibration module 2 in the step (3) and the data of input can be carried out Legendre expansion, the phase-fitting curve negotiating promptly carries out Legendre expansion after importing this unit, obtains phase error and constant term; And utilize subtracter to deduct phase error and constant term, if a phase error peak value is less than a threshold value (being generally 1 degree), then this cell processing finishes, and enters phase error analytic unit 205; Otherwise proceed the Legendre expansion of this matched curve, repeat above operation.
In the phase error pretreatment unit 204, the Legendre expansion formula can be operated by following formula:
The Legendre expansion formula is
Wherein, p
n(t) be the normalized form of Legendre polynomial, wherein T is every frame signal duration, and t is the sampling interval time, and first five items is:
Therefore, obtain graph of errors, as long as obtain coefficient b
nGet final product.In order to obtain b
n, can utilize the orthogonality of expansion, promptly
So just can obtain graph of errors, and the peak-to-peak value of corresponding error.
The expression formula of each time phase error peak-to-peak value is as follows, wherein W
jRepresent peak-to-peak value, unit is a radian.
The error of certificate authenticity module 4 injection unit 405 is made up of a signal generation apparatus and a process chip in the step (4), process chip is modulated to the phase error of range error in 3 outputs of stability calibration module and 2 outputs of error phase calibration module in the ideal linearity FM signal, obtains composite signal.
In the present embodiment, with the platform among rate-aided signal input the present invention in a group, the process chip model is TMS320F28015 in the phase-fitting unit 203 in the phase error calibration module 2, the process chip model that the error of certificate authenticity module 4 is injected unit 405 is TMS320LC549-80, gets at random wherein to get in adjacent 10 frames calibration data and analyze.
Shown in Fig. 9 a, Fig. 9 b, be the phase change curve at stability calibration module 3 power peak places and the changes in amplitude curve at power peak place.As can be seen from the figure, the variation range of phase place is between 108.8 °～109.3 °, less than 0.05 °; The variation range of amplitude is between 41.2dB～41.25dB, less than 0.5dB.The variation that the amplitude at power peak place of stability calibration module 3 outputs and phase place are described is very little, i.e. very stable of the duty of radar system.
The phase place of carrying out of getting a frame the calibration data at random in this 10 frame is decomposed, as shown in figure 10, each high order phase error peak-to-peak value change curve of phase error calibration module 2 outputs is phase error to five a time phase error that obtains after the interior calibration signal phase error quadrature decomposition.As seen from the figure, the variation range of their peak-to-peak value all less than 2 °, illustrates that each high order phase error peak-to-peak value phase error variations is very little for all between-1 °～1 °, and promptly radar system is working properly.
Shown in Figure 11 a, Figure 11 b, Figure 11 c, be respectively resolution, peak sidelobe ratio and the integration secondary lobe that the calibration data obtain in this 10 frame and compare comparison diagram in the matched filter 402 of certificate authenticity module 4.Dotted line represents that respectively the output result of stability calibration module 3 and phase error calibration module 2 is input to after error injects unit 405 and be injected into the ideal linearity FM signal, the resolution that the composite signal that obtains obtains through matched filtering, integration secondary lobe ratio, peak sidelobe ratio, the resolution that the calibration signal frame obtained through matched filtering in solid line was represented respectively, integration secondary lobe ratio and peak sidelobe ratio.As can be seen from the figure, the both overlaps substantially.Illustrate that it is correct that stability calibration module 3 and phase error calibration module 2 are analyzed the result who obtains.Curve in the accompanying drawing exist respectively certain difference be because: in phase place is decomposed, the present invention's resolution process the result of phase error to five a time phase error, but in fact also exist more high order, i.e. phase error more than six times, because the high order phase error is generally very little, do not give considering so generally ignore, perhaps when the random noise processing.
Claims (10)
1. satellite carried SAR inner marking signal processing platform system, comprise TR assembly frequency domain calibration module, analysis result reading module, it is characterized in that, also comprise stability calibration module, phase error calibration module, valid data abstraction module and certificate authenticity module;
The valid data abstraction module will import with the adjacent pairing comparision of self-adaptation that valid data in the rate-aided signal extract in platform original, and these group valid data are outputed to stability calibration module, phase error calibration module, TR assembly frequency domain calibration module and certificate authenticity module respectively; Stability calibration module is measured the amplitude and the phase place at the signal power peak place after the matched filtering, the duty of reflection radar system, and the phase place after will handling respectively and amplitude information output in the analysis result reading module, and the changes in amplitude curve outputs in the reliability demonstration module; Phase error calibration module adopts high precision orthogonal domain error phase decomposition method that error phase is decomposed, obtain the peak value of each time phase error of quadrature, and each the high order phase error peak-to-peak value after will handling respectively outputs to the analysis result reading module, and each high order phase error matched curve outputs to the reliability demonstration module; TR assembly frequency domain calibration module mainly detects the duty of TR assembly, and the result after will handling outputs to the analysis result reading module; The reliability demonstration functions of modules is the whole platform analysis result correctness of checking, and the result is outputed to the analysis result reading module; Finally analyze all results, thereby judge the duty of radar by the analysis result reading module.
2. a kind of satellite carried SAR inner marking signal processing platform system according to claim 1 is characterized in that: described valid data abstraction module is made up of input interface unit, matched filter and output interface unit;
Rate-aided signal form is frame by frame imported by input interface unit in original, and enters in pairs and carry out matched filtering in the matched filter, gets the absolute value of difference between the maximal value of power after its matched filtering; If the value of being somebody's turn to do is very little, can directly remove, do not carry out subsequent operation; If should value very big, judge that these two groups of data are valid data, by the output interface unit, signal is outputed to stability calibration module, phase error calibration module, TR assembly frequency domain calibration module, certificate authenticity module; Carry out next processing after disposing to Frame, and repetitive operation, up to handling whole raw data.
3. a kind of satellite carried SAR inner marking signal processing platform system according to claim 1 is characterized in that: described stability calibration module is preserved unit, matched filter, interpolating unit and output interface unit by input interface unit, amplitude characteristic and is formed;
Signal frame by input interface unit divides two-way, enters amplitude characteristic respectively and preserves unit and matched filter, enters amplitude characteristic preservation unit and the signal amplitude of signal frame can be transformed to curve, and be kept in this unit; Output to interpolating unit after entering the signal filtering of matched filter, and near the data of getting the power peak place are carried out interpolation; In interpolating sequence, choose the position of peak value again, obtain the amplitude of this position signalling and phase place and preserve, repeat interpolation operation then, up to the phase change of the maximal value place signal after the matched filtering in the small scope that error allows; The output interface unit passes to the certificate authenticity module with the changes in amplitude curve, and the phase place at power peak place and amplitude are passed to the analysis result reading module.
4. a kind of satellite carried SAR inner marking signal processing platform system according to claim 1 is characterized in that: described phase error calibration module is removed unit, phase-fitting unit, phase error pretreatment unit, phase error analytic unit and output interface unit by input interface unit, phase place and is formed;
Rate-aided signal is removed the unit to phase place in reading in effectively frame by frame from input interface unit, removes in the unit in phase place, and the standard quadratic phase is removed, and remaining is error phase; The output signal that phase place is removed the unit is input to the phase-fitting unit, obtains the phase-fitting curve; Phase-fitting curve negotiating phase error pretreatment unit, obtain the phase error curve, and be input to the phase error analytic unit, obtain the matched curve and the peak-to-peak value of each high order phase error, and matched curve passed to the certificate authenticity module by the output interface unit, peak-to-peak value is passed to the analysis result reading module; Repeat aforesaid operations, the calibration signal Processing finishes in effectively.
5. a kind of satellite carried SAR inner marking signal processing platform system according to claim 1, it is characterized in that: the index during described certificate authenticity module is assessed by the reference point target comes the result after the internal rate-aided signal matched filtering to analyze, and injects unit, subtractor unit and output interface unit by input interface unit, matched filter, error and forms;
The output result of stability calibration module and phase error calibration module is input to error injection unit and is injected into the ideal linearity FM signal, the composite signal that obtains carries out matched filtering in matched filter, obtain resolution that its resolution, integration secondary lobe obtains through matched filter frame by frame than, peak sidelobe ratio and interior rate-aided signal, integration secondary lobe than and peak sidelobe ratio relatively, obtain the absolute value of respective differences, and output to the analysis result reading module by the output interface unit; Receive calibration data in the next frame again, repeat aforesaid operations, up to handling the input data.
6. a satellite carried SAR inner marking signal Processing implementation method is characterized in that, may further comprise the steps:
Step 1: rate-aided signal form frame by frame and is entered in pairs and carries out matched filtering in the matched filter by the input of the input interface unit of valid data abstraction module in original, gets the absolute value of difference between the maximal value of power after its matched filtering; Size according to this value judges whether effectively; By the output interface unit, signal is outputed to stability calibration module, phase error calibration module, TR assembly frequency domain calibration module, certificate authenticity module;
Step 2: the signal frame of calibrating the input interface unit of module by stability enters amplitude characteristic preservation unit and matched filter respectively, enters amplitude characteristic preservation unit and the signal amplitude of signal frame can be transformed to curve, and be kept in this unit; Output to interpolating unit after entering the signal filtering of matched filter, and near the data of getting the power peak place are carried out interpolation; The changes in amplitude curve passes to the certificate authenticity module, and the phase place at power peak place and amplitude pass to the analysis result reading module;
Step 3: rate-aided signal is removed the unit to the phase place of phase error calibration module in reading in effectively, removes the standard quadratic phase, and remaining is error phase and is input to the phase-fitting unit, obtain the phase-fitting curve; Phase-fitting curve negotiating phase error pretreatment unit, obtain the phase error curve, and be input to the phase error analytic unit, obtain the matched curve and the peak-to-peak value of each high order phase error, and matched curve passed to the certificate authenticity module, peak-to-peak value passes to the analysis result reading module;
Step 4: the error that relevant output result is input to the certificate authenticity module is injected the unit, and be injected in the ideal linearity FM signal, the composite signal that obtains carries out matched filtering in matched filter, obtaining its resolution, integration secondary lobe passes through matched filter frame by frame than, peak sidelobe ratio and interior rate-aided signal and obtains corresponding index and compare, obtain the absolute value of respective differences, and output to the analysis result reading module by the output interface unit;
Step 5: rate-aided signal is input to TR assembly frequency domain calibration module effectively, is used for detecting the duty of TR assembly, and the analysis result that the result after will handling and reliability demonstration module verification draw outputs to the analysis result reading module together; Finally analyze the result of all inputs, thereby judge the duty of radar by the analysis result reading module;
Step 6: receive calibration data in the next frame, repeating step one is to step 5, up to handling the input data.
7. a kind of satellite carried SAR inner marking signal Processing implementation method according to claim 6 is characterized in that:
The phase place of phase error calibration module is removed in the unit in the described step 3, the ideal linearity FM signal that produces is through getting after conjugation means gets conjugation, calibration signal multiplication in multiplier and effectively, this moment, the standard quadratic phase of output signal was removed, and remaining is error phase.
8. a kind of satellite carried SAR inner marking signal Processing implementation method according to claim 6 is characterized in that: the treatment step of the phase-fitting unit in the described step 3 in the phase error calibration module is as follows:
A, at first get first sampled point that phase place is removed the output signal of unit, as first point of phase curve;
B, the conjugation of in getting conjugation means, getting this first sampled point, and then second sampled point of multiplier neutralization multiply each other, and gets the phase place of its result of product;
C, the phase place of this phase place and first sampled point by the totalizer addition, as second point of phase curve;
D, repetitive operation finish until all sampled points processing, obtain the phase-fitting curve.
9. a kind of satellite carried SAR inner marking signal Processing implementation method according to claim 6, it is characterized in that: phase error is calibrated in the phase error pretreatment unit of module in the described step 3, contain process chip and the data of input can be carried out Legendre expansion, the phase-fitting curve negotiating promptly carries out Legendre expansion after importing this unit, obtains phase error and constant term; And utilize subtracter to deduct phase error and constant term, if a phase error peak value less than a threshold value, then this cell processing finishes, and enters the phase error analytic unit; Otherwise proceed the Legendre expansion of this matched curve, repeat above operation.
10. a kind of satellite carried SAR inner marking signal Processing implementation method according to claim 6, it is characterized in that: the error of certificate authenticity module is injected the unit in the described step 4, form by a signal generation apparatus and a process chip, process chip is modulated to the phase error of the range error of stability calibration module output and the output of error phase calibration module in the ideal linearity FM signal, obtains composite signal.
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