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Signal parameter real-time precision measurement method of synthetic aperture radar

A technology of synthetic aperture radar and signal parameters, which is applied in the field of radar signal reconnaissance to achieve the effect of increasing signal processing gain, reducing measurement error, and realizing real-time precision measurement

Inactive Publication Date: 2011-05-11
BEIJING INSTITUTE OF TECHNOLOGYGY
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Problems solved by technology

[0004] The purpose of the present invention is to provide a real-time precision measurement method for synthetic aperture radar signal parameters, to solve the problem that it is difficult to carry out real-time and precise measurement of non-cooperative SAR signal parameters in the prior art

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  • Signal parameter real-time precision measurement method of synthetic aperture radar
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[0023] A real-time precision measurement method for SAR signal parameters of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0024] The present invention is a real-time precision measurement method for SAR signal parameters, the process is as follows figure 1 shown. The bandwidth of ultra-wideband SAR signals is at the GHz level. To sample such signals, the analog-to-digital conversion rate must also be at the Gsps level, and it is still I / Q sampling. The fast Fourier transform (FFT) used in channelization filtering is realized by radix-4 butterfly operation, and the addition of multiple data is realized by multi-stage pipeline addition in the field programmable gate array to improve the adaptability of the processor. processing speed. In the processing, the method of block floating point is used to deal with the bit growth problem of data addition, so as to obtain high-precision processing results. After performing f...

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Abstract

The invention provides a signal parameter real-time precision measurement method of a synthetic aperture radar (SAR) and belongs to the field of radar signal detection. The method integrates the digital channelized receiver technique and the phase difference instantaneous frequency measurement technique to achieve the real-time parameter measurement of the signals of the SAR; in consideration of the processing capacity of the processor and the hardware resources, the parallel processing method and the hardware resource time division multiplexing method are integrated to achieve the real-time processing of the huge data stream generated by the signals of the high-bandwidth high-timewidth non-cooperative SAR in the prior processor; the inherent error of the system time parameter is analyzed by use of the laboratory environment and the time parameter is compensated; and the transient response is avoided by utilizing the characteristics of the SAR signals and the frequency-domain parameter is correctd to obtain the accurate frequency-domain parameter. The method reduces the computation load, provides full consideration, achieves the real-time precision measurement of the signal parameters of the high-bandwidth high-timewidth non-cooperative SAR, and improves the real-time property and the precision of processing the high-bandwidth high-timewidth signals of the detection receivers in service.

Description

technical field [0001] The invention relates to a method for real-time and precise measurement of synthetic aperture radar (SAR) signal parameters, which belongs to the field of radar signal reconnaissance. Background technique [0002] Synthetic aperture radar is a radar that uses the relative motion of the radar and the target to synthesize a smaller real antenna aperture into a larger equivalent antenna aperture by means of data processing. In order to increase the detection range without losing the range resolution, SAR usually uses a chirp signal with a large time-width-bandwidth product characteristic. By adopting chirp signal, SAR has improved detection ability and low interception at the same time. In modern electronic warfare, aiming at the large time width, large bandwidth and low interception of SAR signals, it is of great significance to propose a method for precise real-time parameter measurement of non-cooperative SAR signals. [0003] At present, many method...

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Application Information

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IPC IPC(8): G01S7/40
Inventor 刘国满高梅国许世超
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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