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FPGA-based InSAR channel amplitude and phase error estimation method

A technology of amplitude, phase error and channel, which is applied in the field of radar real-time signal processing system, can solve problems such as large amount of calculation, large resource consumption, difficult timing control, etc., and achieve the effect of small amount of calculation, smooth estimation result, and easy operation

Inactive Publication Date: 2015-09-23
XIDIAN UNIV
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Problems solved by technology

[0005] The purpose of the present invention is to propose an FPGA-based InSAR channel amplitude and phase error estimation method to solve the problems of difficult control of timing, huge amount of calculation and excessive resource consumption in the above-mentioned prior art

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  • FPGA-based InSAR channel amplitude and phase error estimation method
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  • FPGA-based InSAR channel amplitude and phase error estimation method

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Embodiment Construction

[0024] The present invention will be further described below in conjunction with the accompanying drawings.

[0025] refer to figure 1 , the concrete implementation steps that the present invention realizes in FPGA are as follows:

[0026] Step 1, input channel data.

[0027] When estimating the amplitude and phase error characteristics between channels, one channel in the dual-channel radar real-time signal processing system is used as the main channel, and the other channel is used as the auxiliary channel;

[0028] The linear frequency modulation signal received by the main channel and the auxiliary channel is converted into 16-bit fixed-point real and imaginary part data of the main channel and real and imaginary part data of the auxiliary channel through A / D conversion and down-conversion operation respectively. These data include the main channel and the Amplitude and phase error characteristics between auxiliary channels;

[0029] The 16-bit fixed-point real and imag...

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Abstract

The invention discloses an FPGA-based inter-channel amplitude and phase error characteristic frequency domain windowing estimation method. The problem of reduced inter-channel coherence, which is caused by inconsistent amplitude and phase characteristics of multiple channels of the existing radar system, is solved. The method comprises the steps that (1) channel data are input; (2) time-frequency conversion is carried out on channel signals; (3) spectrum alignment is carried out on the spectrums of the channel signals; (4) FFT conversion is carried out on a spectrum alignment result; (5) windowing is carried out on the FFT conversion result of spectrum alignment; (6) and inverse FFT operation is carried out the windowed data to acquire inter-channel amplitude and phase error characteristic estimation. According to the invention, fast and efficient functions of FFT time-frequency conversion and time sequence logic control of FPGA are fully used; a high-quality amplitude and phase error characteristic estimation result can be acquired under the condition of large spurious noise; the influence of spurious noise on the estimation result is reduced; and the method can be applied to a two-channel and / or multi-channel radar real-time signal processing system.

Description

technical field [0001] The invention belongs to the technical field of signal processing, and in particular relates to an amplitude-phase error estimation method of an interferometric synthetic aperture radar InSAR, which can be used in a dual-channel and / or multi-channel radar real-time signal processing system. Background technique [0002] Due to the difference in the manufacturing process of the multi-channel radar signal processing system, there are inevitably amplitude and phase errors between the channels. For the synthetic aperture radar InSAR system, the existence of the amplitude and phase errors will seriously deteriorate the peak side lobe ratio PSLR and integral side lobe ratio of the signal. ISLR and imaging resolution make the InSAR interferometric phase map deviate, reduce the coherence of the image, and affect the measurement performance of the final DEM. Researching a real-time and efficient error estimation method is the fundamental starting point to solve...

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Application Information

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IPC IPC(8): G01S13/90G01S7/02
CPCG01S7/02G01S13/9011G01S13/9023
Inventor 索志勇杨志富李真芳王朝亿
Owner XIDIAN UNIV
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