CN201555948U - System for realizing generation and receiving of super bandwidth signals by subband synthesis - Google Patents
System for realizing generation and receiving of super bandwidth signals by subband synthesis Download PDFInfo
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- CN201555948U CN201555948U CN2009201807760U CN200920180776U CN201555948U CN 201555948 U CN201555948 U CN 201555948U CN 2009201807760 U CN2009201807760 U CN 2009201807760U CN 200920180776 U CN200920180776 U CN 200920180776U CN 201555948 U CN201555948 U CN 201555948U
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Abstract
The utility model relates to a system for realizing generation and receiving of super bandwidth signals by subband synthesis used for an onboard synthetic aperture radar (SAR), wherein a signal generator 1 of the system is connected with a modulator 2; the output of the modulator 2 is connected with a frequency multiplier 3 which is connected with a bandwidth upper frequency converter 4; echo signals enter a low-noise amplifier 6 which is connected with a subband sorting filter 7; the subband sorting filter 7 is connected with a bandwidth lower frequency converter 8 which is connected with a quadrature demodulator 9; the quadrature demodulator 9 is connected with a data acquisition processor 10; a frequency synthesizer 5 is respectively connected with the signal generator 1, the modulator 3, the bandwidth upper frequency converter 4, the bandwidth lower frequency converter 8, the quadrature demodulator 9 and the data acquisition processor 10; the system generates, receives and processes N subband signals with equal intervals and bandwidth of B through time sharing, and conducts predistortion amplitude-phase compensation according to the subbands, and obtains the pulse pressure effect approximating NB super bandwidth. The system realizes signal generation, receiving and processing of signals with the bandwidth of being more than 2GHz, and realizes miniaturization and low cost.
Description
Technical field
The utility model relates to the airborne synthetic aperture of high-resolution (SAR) radar signal and produces and reception technique, realize that in conjunction with pre-distortion compensated the super large bandwidth signal produces and receiving system, is typically applied in ultrahigh resolution (more than the 0.1m) airborne synthetic aperture radar for a kind of subband is synthetic.
Background technology
Characteristics such as airborne synthetic aperture radar (SAR) reconnaissance system is round-the-clock owing to it, round-the-clock, safety coefficient height are just by the international market extensive concern.Its middle high-resolution is the eternal pursuit of polarization sensitive synthetic aperture radar system, owing to be subjected to work clock and device wide band dispersion effects, adopt conventional technological means also to be difficult to realize the above signal generation of 2GHz bandwidth and to receive handle at present, simultaneously owing to be subjected to the restriction of airborne platform load-carrying ability, the ultrahigh resolution system should have microminiaturized again and characteristics cheaply, and the utility model solves ultrahigh resolution synthetic-aperture radar super large bandwidth signal exactly and produces with receiving and handle problems.
The utility model content
Technical problem to be solved in the utility model provides a kind of ultrahigh resolution polarization sensitive synthetic aperture radar system super large bandwidth signal that is applied to and produces and receiver system, and this signal generation and receiving system have adopted wide subband to synthesize in conjunction with the pre-distortion compensated mode and realized that the super large bandwidth signal produces and receive processing.
The technical scheme that the utility model adopted is:
The synthetic ultra-broadband signal of realizing of subband produces and receiving system, comprises that signal generator 1, modulator 2, frequency multiplier 3, broadband upconverter 4, frequency synthesizer 5, low noise amplifier 6, subband divide selecting filter 7, broadband low-converter 8, quadrature demodulator 9 and data collection processor 10;
Useful technique effect of the present utility model is: adopt the subband synthesis mode to realize that in conjunction with pre-distortion compensated the super large bandwidth signal produces and reception is handled, signal generator wherein, frequency multiplier, modulator, subband divides selecting filter, quadrature demodulator and data collection processor are conventional bandwidth, the broadband upconverter is only arranged, low noise amplifier, broadband low-converter and frequency synthesizer are ultra broadband, carrying out subband by data acquisition process at last synthesizes, its principal feature has solved the broadband bottleneck in the ultrahigh resolution polarization sensitive synthetic aperture radar system, and super large bandwidth technical bottleneck mainly contains: signal generator, frequency multiplier, modulator, detuner and data collection processor.Subband is synthetic to make the above super large bandwidth of 2GHz become possibility, obtains high signal quality in conjunction with pre-distortion compensated simultaneously and produces with receiving and handle, owing to avoided main broadband bottleneck, therefore is easier to integratedly on engineering, and the while cost is relatively low.
The utility model produces and receives the pulse pressure effect that subband signal that to handle uniformly-spaced N bandwidth be B obtains to be similar to NB super large bandwidth by timesharing.
The utility model is mainly used in the ultrahigh resolution polarization sensitive synthetic aperture radar system, and the typical case is as 0.1m or be better than the airborne reconnaissance system of 0.1m super-resolution.This technology can be applied to have very high engineering practical value in the multiple super large bandwidth system, and its social value and economic worth are very considerable.
Description of drawings
Fig. 1 is a structural principle block diagram of the present utility model.
Embodiment
Design philosophy of the present utility model is that the employing subband synthesizes in conjunction with pre-distortion compensated, realizes that the super large bandwidth signal produces and the reception processing, has avoided present restriction super large bandwidth signal and has produced and the technical bottleneck that receives processing.
The composition of hardware of the present utility model is as shown in Figure 1: comprise that signal generator 1, modulator 2, frequency multiplier 3, broadband upconverter 4, frequency synthesizer 5, low noise amplifier 6, subband divide selecting filter 7, broadband low-converter 8, quadrature demodulator 9 and data collection processor 10;
The super large bandwidth signal produces: system produces two-way orthogonal wideband signal by signal generator 1, carry out bandwidth multiplication and carrier wave is moved by modulator 2, carry out the bandwidth multiplication by frequency multiplier 3 again, the signal bandwidth that signal generator 1 produces has realized doubling to bandwidth B for four times through this, produce different local oscillators by broadband upconverter 4 and timesharing then and carry out up-conversion from frequency synthesizer 5, frequency synthesizer 5 timesharing produce the frequency conversion local oscillator for uniformly-spaced, it is slightly less than B at interval and helps rejecting when subband synthesizes splicing place distortion, the frequency number is N, therefore by after the broadband upconverter 4, system will timesharing produce the uniformly-spaced subband signal of N B bandwidth on different carrier.Therefore each equivalence that transmits of this ultrahigh resolution polarization sensitive synthetic aperture radar system is made up of for the B subpulse N bandwidth.
The super large bandwidth receives to be handled: N bandwidth is that B subpulse echoed signal is through low noise amplifier 6, divide selecting filter 7 by quick subband, produce different local oscillators with timesharing again and carry out down coversion at broadband low-converter 8 from frequency synthesizer 5, therefore echo will timesharing produce N the echo signal of intermediate frequency that bandwidth is B on same intermediate frequency carrier after this handles, carry out demodulation by quadrature demodulator 9 then, deliver to data collection processor 10 and carry out data acquisition and subband splicing.For preventing to splice the signal quality loss of seam crossing, when realizing the subband splicing, will suitably lose certain signal bandwidth.Therefore splicing back signal bandwidth will be slightly less than NB.
Pre-distortion compensated: since subband synthetic after, the pulse pressure adaptation function can only be at single super large bandwidth signal, the width of cloth phase distortion that produces for different sub-band is helpless, therefore for obtaining comparatively ideal super large bandwidth pulses compression property, need carry out subband width of cloth phase pre-distortion compensated.Because subband broader bandwidth, different sub-band are on different carrier frequencies, therefore different subbands has different width of cloth phase distorted characteristics, and the utility model adopts compensation way respectively, obtains good effect.Method is by extracting broadband upconverter 4 sample of signal to low noise amplifier 6,, extract width of cloth phase distortion parameter and feed back to signal generator 1 to data collection processor 10 by the big closed loop of signal, carrying out pre-distortion compensated.
Increase subband in this utility model in than conventional system and divide the local oscillator of selecting filter 7 and frequency synthesizer 5 fast to become function, the local oscillator by frequency synthesizer 5 fast become function in broadband upconverter 4 on different carrier timesharing produce the subband signal that N bandwidth is B.Subband divides selecting filter to prevent aliasing between the sub-band echo short pulse group signal, local oscillator by frequency synthesizer 5 fast becomes function timesharing in broadband low-converter 8 and produces the subband signal of a same carrier wave N bandwidth into B simultaneously, and it is synthetic to carry out subband then in data collection processor 10.Data collection processor 10 has increased the subband complex functionality than conventional processors, and signal generator 1 has increased same bandwidth different sub-band timesharing pre-distortion compensated function than routine.
Claims (1)
1. the synthetic ultra-broadband signal of realizing of subband produces and receiving system, comprise that signal generator (1), modulator (2), frequency multiplier (3), broadband upconverter (4), frequency synthesizer (5), low noise amplifier (6), subband divide selecting filter (7), broadband low-converter (8), quadrature demodulator (9) and data collection processor (10), is characterized in that:
Signal generator (1) connects modulator (2), and its output connects frequency multiplier (3), and frequency multiplier (3) connects broadband upconverter (4); Echoed signal enters low noise amplifier (6), low noise amplifier (6) connects subband sorting wave filter (7), subband divides selecting filter (7) to connect broadband low-converter (8), broadband low-converter (8) connects quadrature demodulator (9), and quadrature demodulator (9) connects data collection processor (10); Frequency synthesizer (5) connects signal generator (1), modulator (3), broadband upconverter (4), broadband low-converter (8), quadrature demodulator (9) and data collection processor (10) respectively; Wherein broadband upconverter (4), low noise amplifier (6), broadband low-converter (8) and frequency synthesizer (5) are ultra broadband; Produce and receive by timesharing and handle uniformly-spaced N subband signal that bandwidth is B, and carry out the predistortion width of cloth by subband and compensate mutually, obtain to be similar to the pulse pressure effect of NB super large bandwidth.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2009201807760U CN201555948U (en) | 2009-11-27 | 2009-11-27 | System for realizing generation and receiving of super bandwidth signals by subband synthesis |
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| CN2009201807760U CN201555948U (en) | 2009-11-27 | 2009-11-27 | System for realizing generation and receiving of super bandwidth signals by subband synthesis |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102221689A (en) * | 2011-06-01 | 2011-10-19 | 中国人民解放军国防科学技术大学 | Multi-channel correcting method for ultra wide-band synthetic aperture radar |
| CN102510366A (en) * | 2011-11-18 | 2012-06-20 | 北京航天测控技术有限公司 | Microwave signal generating device |
| CN106772264A (en) * | 2016-11-11 | 2017-05-31 | 上海航天测控通信研究所 | A kind of ground and spaceborne general ultra-wideband radar signal generating means and method |
| CN109490884A (en) * | 2018-11-21 | 2019-03-19 | 中国科学院电子学研究所 | A kind of jamproof multiple-pulse combined imaging method of realization SAR |
| CN109633594A (en) * | 2019-01-23 | 2019-04-16 | 北京理工大学 | A kind of high-speed moving object parametric joint estimation method based on sub-band division processing |
| CN113567939A (en) * | 2021-05-17 | 2021-10-29 | 陕西航天技术应用研究院有限公司 | Predistortion compensation method and module for synthetic aperture radar system and transceiving system |
-
2009
- 2009-11-27 CN CN2009201807760U patent/CN201555948U/en not_active Expired - Lifetime
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102221689A (en) * | 2011-06-01 | 2011-10-19 | 中国人民解放军国防科学技术大学 | Multi-channel correcting method for ultra wide-band synthetic aperture radar |
| CN102221689B (en) * | 2011-06-01 | 2012-09-05 | 中国人民解放军国防科学技术大学 | Multi-channel correcting method for ultra wide-band synthetic aperture radar |
| CN102510366A (en) * | 2011-11-18 | 2012-06-20 | 北京航天测控技术有限公司 | Microwave signal generating device |
| CN106772264A (en) * | 2016-11-11 | 2017-05-31 | 上海航天测控通信研究所 | A kind of ground and spaceborne general ultra-wideband radar signal generating means and method |
| CN106772264B (en) * | 2016-11-11 | 2020-02-18 | 上海航天测控通信研究所 | Ground and satellite-borne universal ultra-wideband radar signal generating device and method |
| CN109490884A (en) * | 2018-11-21 | 2019-03-19 | 中国科学院电子学研究所 | A kind of jamproof multiple-pulse combined imaging method of realization SAR |
| CN109490884B (en) * | 2018-11-21 | 2020-08-07 | 中国科学院电子学研究所 | Multi-pulse combined imaging method for realizing anti-interference of SAR (synthetic aperture radar) |
| CN109633594A (en) * | 2019-01-23 | 2019-04-16 | 北京理工大学 | A kind of high-speed moving object parametric joint estimation method based on sub-band division processing |
| CN113567939A (en) * | 2021-05-17 | 2021-10-29 | 陕西航天技术应用研究院有限公司 | Predistortion compensation method and module for synthetic aperture radar system and transceiving system |
| CN113567939B (en) * | 2021-05-17 | 2024-05-10 | 陕西航天技术应用研究院有限公司 | Predistortion compensation method, module and receiving and transmitting system of synthetic aperture radar system |
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Granted publication date: 20100818 |
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| CX01 | Expiry of patent term |