An Amplitude and Phase Error Correction Method of Frequency Modulated Continuous Wave Linear Array Based on Single Feature Point
A FM continuous wave, amplitude and phase error technology, which is applied in the field of FM continuous wave linear array amplitude and phase error correction based on a single characteristic point, and can solve the problem of inappropriate multi-channel amplitude and phase error correction.
Active Publication Date: 2016-05-11
INST OF ELECTRONICS CHINESE ACAD OF SCI
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However, these methods are all based on the pulse system. Under the pulse system, there is no problem of nonlinear error of the transmitted signal. However, the FMCW system uses the de-slant method for reception. This de-slant reception method causes point target echoes at different distances. The nonlinear part of the signal has different forms, and obviously the above method is not suitable for multi-channel amplitude-phase error correction under the FMCW system
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[0023] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be described in further detail below in conjunction with specific embodiments and with reference to the accompanying drawings.
[0024] Aiming at the problem that the nonlinear error of frequency modulation and multi-channel amplitude and phase errors exist in the frequency modulation continuous wave linear array imaging radar system, the quality of the reconstructed radar image is degraded by direct imaging, and a frequency modulation continuous wave based on a single characteristic point is proposed. Line array amplitude and phase error correction method. This method first corrects the frequency modulation nonlinear error signal in the echo, then uses RVP filtering to separate the frequency modulation nonlinear error from the multi-channel amplitude-phase error, and finally corrects the frequency modulation nonlinear error separately. The influen...
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The invention discloses a frequency modulated continuous wave linear array amplitude-phase error correction method based on a single dominant scattering center. The method includes the steps: firstly, correcting frequency modulated nonlinear error signals in echo waves; secondly, separating frequency modulated nonlinear errors from multichannel amplitude-phase errors by the aid of RVP (residual video phase) filter processing; finally, respectively correcting signals obtained after RVP filter processing of the frequency modulated nonlinear errors and the influence of the multichannel amplitude-phase errors to correct overall amplitude-phase errors of the echo waves received by a system. The method solves the problem that the quality of a reconstructed radar image is degraded due to direct imaging as a frequency modulated continuous wave linear array imaging radar system has the frequency modulated nonlinear errors and the multichannel amplitude-phase errors.
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Technical field: [0001] The invention relates to the technical field of frequency modulated continuous wave (Frequency Modulated Continuous Wave, FMCW) linear array synthetic aperture radar system, in particular to a method for correcting amplitude and phase errors of frequency modulated continuous wave linear array based on a single characteristic point. Background technique: [0002] The principle of Frequency Modulated Continuous Wave (FMCW) linear array synthetic aperture radar system (Synthetic ApertureRadar, SAR) is to transmit a large time-width-bandwidth linear frequency modulation signal in the range direction, and use pulse compression to obtain high resolution in the range direction; arrange in the array direction The antenna array controls the array elements to conduct sequentially through the switch network to complete the data collection in this direction, and then uses the aperture synthesis to obtain high resolution in the array direction. Combining the two ca...
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IPC IPC(8): G01S7/40G01S13/90
CPCG01S7/40G01S13/90
Inventor 谭维贤杨晓琳乞耀龙王彦平洪文
Owner INST OF ELECTRONICS CHINESE ACAD OF SCI