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Motion error compensation method for synthetic aperture radar frequency domain BP algorithm

A synthetic aperture radar, motion error technology, applied in the direction of reflection/re-radiation of radio waves, use of re-radiation, measurement devices, etc., can solve the problems of difficult and high-precision error compensation, large amount of calculation, and phase compensation of the entire scene.

Active Publication Date: 2019-08-09
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Problems solved by technology

However, these self-focusing algorithms are faced with the problem of large amount of calculation or the inability to perform accurate phase compensation for the entire scene
And these methods are not suitable for frequency domain BP algorithm, it is difficult to perform high-precision error compensation for frequency domain BP algorithm imaging

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  • Motion error compensation method for synthetic aperture radar frequency domain BP algorithm

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Embodiment Construction

[0091] The present invention mainly adopts the method of computer simulation to verify, and all steps and conclusions are verified correctly on the cup being InterI7-8700K 3.7GHz, and the MATLAB version being R2017b. The specific implementation steps are as follows:

[0092] Step 1. Initialization of relevant parameters

[0093] The initialization parameters are all known, and the initialization parameters are as follows: the speed of light is C=3×10 8 m / s; the radar transmits a linear frequency modulation signal, and the carrier frequency is ω=6×π×10 9 rad / s; the bandwidth of the radar emission pulse is B=300×10 6 Hz; the time width of the radar emission pulse is T p =1×10 -6 s; the radar pulse repetition period is T=0.002s; the radar echo distance sampling frequency is f s =390×10 6 Hz; the radar echo data matrix is ​​S K×L ; Radar echo data matrix S K×L The azimuth direction points and distance direction points are K=500 and L=2048 (K and L are positive integers) re...

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Abstract

The invention discloses a motion error compensation method for a synthetic aperture radar frequency domain BP algorithm. On the basis of an image sharpness optimal criterion, an equivalent phase center error is estimated to carry out motion compensation. Imaging is carried out by using a constant-speed linear motion trajectory of a radar platform based on a frequency domain BP algorithm, so that an unfocused SAR image obtained by frequency domain BP algorithm imaging is obtained; with SAR image sharpness as an objective function, an antenna phase center position error is estimated by the optimization technique; and then an estimated APC position error is added to the constant-speed linear motion trajectory to obtain an APC absolute position, and final high-precision imaging is performed byusing the frequency domain BP algorithm. According to the invention, imaging processing is performed in the frequency domain and the distance history from a scattering point to an array element doesnot need to be calculated, so that the required computing time is substantially reduced by being compared with that of the time domain self-focusing BP algorithm. Therefore, the method is suitable forlarge-scene long-apertures high-precision SAR imaging.

Description

technical field [0001] The invention belongs to the technical field of synthetic aperture radar (Synthetic Aperture Radar, SAR) high-resolution imaging, and particularly relates to the technical field of SAR high-precision motion compensation. Background technique [0002] Synthetic Aperture Radar (SAR) is a high-resolution microwave imaging radar with the advantages of all-day and all-weather operation, and has been widely used in various fields, such as terrain mapping, guidance, environmental remote sensing and resource exploration. The important premise of SAR application and the main goal of signal processing is to obtain high-resolution and high-precision microwave images through imaging algorithms. However, many environmental factors (such as wind field, turbulence, etc.) will cause the trajectory of the radar carrier platform to deviate from the ideal trajectory of the design, which will seriously affect the quality of SAR images (including focus depth, contrast, etc...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S13/90G01S7/41
CPCG01S7/41
Inventor 张晓玲王阳阳周黎明张星月师君韦顺军
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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