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Multi-channel correcting method for ultra wide-band synthetic aperture radar

A technology of synthetic aperture radar and correction method, which is applied to radio wave measurement systems, instruments, etc., can solve problems such as unfavorable processing, ideal echo signals do not have approximate rectangles, and pulse compression performance cannot be obtained, so as to improve pulse compression performance, Correcting the effect of frequency characteristic mismatch

Active Publication Date: 2012-09-05
NAT UNIV OF DEFENSE TECH
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Problems solved by technology

However, when the time-width-bandwidth product of the chirp signal is less than 100 (this is called the hour-wide bandwidth product chirp signal), the amplitude spectrum of the ideal echo signal does not have approximately rectangular characteristics, and there is a serious Fresnel in the passband Therefore, selecting the ideal receiving channel as the reference channel for channel correction cannot obtain good pulse compression performance, which is not conducive to the processing of UWB SAR / GMTI back-end systems

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  • Multi-channel correcting method for ultra wide-band synthetic aperture radar
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Embodiment Construction

[0035] figure 1 It is a flow chart of the channel correction method of the present invention, and the specific implementation is divided into four steps:

[0036] The first step is to construct a matched filter system function M(f) using spectral correction technology;

[0037] The second step is to modify the ideal receiving channel to obtain the reference channel H ref (f);

[0038] The third step is to construct a channel equalizer E for each receiving channel m (f), m=1,2,...,L;

[0039] The fourth step is to complete the correction of channel inconsistency.

[0040] Figure 2 to Figure 4 It is the result of experiments using actual measured data in the laboratory. The number of channels of the actual radar system used is 3.

[0041] figure 2 is the relative amplitude and phase error of the measured data of the three channels before channel calibration. Mismatch channel relative amplitude and phase error factor D mn (f) is defined as the ratio of the system func...

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Abstract

The invention provides a multi-channel correcting method for ultra wide-band synthetic aperture radar. The method is applied to a multi-channel ultra wide-band synthetic aperture radar / ground moving target indication (UWB SAR / GMTI) system under an hour wide-band width product linear frequency modulation signal system. The technical scheme disclosed by the invention comprises the following stepsof: 1, constructing a matched filter system function by using a spectrum correcting technology; 2, correcting an ideal receiving channel to acquire a reference channel; 3, constructing a channel equalizer for each receiving channel; and 4, completing inconsistency correction of the channels. According to the multi-channel correcting method disclosed by the invention, by combining the spectrum correcting technology and inserting the channel equalizer into each receiving channel, frequency property mismatch is corrected, inconsistency correction of the channels is completed, and the pulse compression performance of hour wide-band width product linear frequency modulation signals is effectively improved.

Description

technical field [0001] The invention belongs to the technical field of radar signal processing, and relates to a channel correction method of a multi-channel UWB SAR (Ultra Wide-band Synthetic Aperture Radar, ultra wide-band synthetic aperture radar), especially a multi-channel UWB SAR under the hourly wide-bandwidth product chirp signal system Channel correction method. Background technique [0002] The research and war practice in the past ten years has shown that the combination of UWB SAR and GMTI (Ground Moving Target Indication, Ground Moving Target Indication) can better meet the needs of modern battlefield reconnaissance. It can better capture the actual scene, improve the intelligence gathering ability and the accuracy of intelligence. Among them, clutter suppression is the primary problem of moving target detection, and channel correction is an important factor affecting the performance of clutter suppression. Therefore, channel correction is an important issue i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S7/40
Inventor 黄晓涛朱国富雷鹏正黎向阳李悦丽周智敏范崇祎周红
Owner NAT UNIV OF DEFENSE TECH
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