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Doppler shift measuring method and device thereof

A technology of Doppler shift and measurement method is applied in the field of high-precision measurement, Doppler shift measurement method and device thereof, and achieves the effects of saving hardware cost, less resource consumption, and lowering transmission frequency and cost

Inactive Publication Date: 2014-08-13
TIANJIN UNIV
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

Therefore, there is still a lot of room for improving the accuracy of the Doppler frequency shift estimation based on CRT.

Method used

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  • Doppler shift measuring method and device thereof
  • Doppler shift measuring method and device thereof

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Embodiment Construction

[0037] In order to make the purpose, technical solution and advantages of the present invention clearer, the implementation manners of the present invention will be further described in detail below.

[0038] In recent years, literature [24] proposed a closed analytical form of CRT reconstruction method, which relaxes the requirement of L modulus values ​​to be mutually prime required by the classic Chinese remainder theorem, and only requires L modulus values ​​to have a certain maximum convention The number (greatest common divider, gcd) can be M, which satisfies M=gcd{M 1 , M 2 ,...,M L}, and literature [24] extended the CRT reconstruction object from the limited integer field to any real number field (that is, the decimal can be reconstructed), and the Doppler frequency shift in the SAR radar system is just arbitrary, so the literature [24] The closed analytical form of the CRT is well suited for estimating the SAR Doppler shift. However, the closed analytical form of C...

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Abstract

The invention discloses a Doppler shift measuring method and a device thereof. The Doppler shift measuring method comprises the steps of detecting the same moving target through L branches of local receiving antenna arrays of different low frequency bands, receiving and obtaining L branches of SAR signals, and storing the L branches of SAR signals; carrying out fast Fourier transformation and Hanning double-window all-phase fast Fourier transformation on the L branches of SAR signals to obtain a magnitude spectrum and a phase spectrum respectively; carrying out spectrum correction on the peak value position through the phase difference frequency correction method to obtain corrected peak value position estimation and then obtain remainder information; according to the remainder information obtained through spectrum correction of each branch, processing remainders according to the Chinese remainder theorem of the closed analytical form to reconstruct Doppler shift estimation of target signals. According to the device, a radar detects a target to be detected to obtain L branches of SAR values, the SAR values enter a DSP in a parallel digital input mode and are processed by the DSP to obtain Doppler shift estimation of the moving target to be detected, and finally, Doppler shift values are displayed by means of a drive and a display module of the drive.

Description

technical field [0001] The present invention relates to the technical field of digital signal processing, in particular to a Doppler shift measurement method and its device, and in particular to the high-precision measurement of the Doppler shift of a moving target on samples obtained by multiple detectors . Background technique [0002] In a Synthetic Aperture Radar (SAR) system, the Doppler shift estimation and detection of a moving target is a crucial issue, because if the Doppler frequency shift measurement is accurate, it is very beneficial to the detection of the target. High-precision speed measurement, target tracking and positioning, etc., have attracted widespread attention from relevant scholars at home and abroad. [0003] The occurrence of Doppler frequency shift is because when detecting a moving target, due to the relative movement between the moving target and the detector, there will be a Doppler effect, that is, a Doppler shift, which is related to the spe...

Claims

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Application Information

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IPC IPC(8): G01S7/41
CPCG01S7/40G01S13/9029
Inventor 黄翔东丁道贤
Owner TIANJIN UNIV
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