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Bistatic forward-looking synthetic aperture radar motion error estimation method

A technology of synthetic aperture radar and motion error, applied in the field of radar, can solve problems such as azimuth space variability cannot be ignored, motion error estimation accuracy is low, etc.

Active Publication Date: 2016-11-16
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Problems solved by technology

However, the above literatures only consider the range-space variation of the motion error. Compared with the monostatic front-looking and side-looking SAR, the forward-looking bistatic SAR receiver makes the azimuth space-variation of the motion error cannot be ignored. Therefore, the above method is applied to In the bistatic forward-looking SAR mode, the motion error estimation accuracy is low

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  • Bistatic forward-looking synthetic aperture radar motion error estimation method
  • Bistatic forward-looking synthetic aperture radar motion error estimation method
  • Bistatic forward-looking synthetic aperture radar motion error estimation method

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Embodiment Construction

[0079] The present invention mainly adopts the method of simulation experiment to carry out verification, and all simulations are realized based on the matlab platform. A specific embodiment will now be described.

[0080] S0: Initialize the parameters of the imaging system; the geometric structure of the bistatic forward-looking SAR adopted in this embodiment is as follows figure 2 shown. Its parameters such as image 3 shown in the parameter table. The target scenario used in this embodiment is as follows Figure 4 As shown, the black dots in the figure are 9 point targets arranged on the ground. These 9 points are distributed on the x-axis and y-axis, with an interval of 100m along the x direction (cut track), and along the y direction (along the track). Tracks) at intervals of 100m, the platform moves along the y-axis.

[0081] When the center of the beam is at the origin of the scene coordinates, it is recorded as zero time, the platform speed is v, the position coo...

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Abstract

The invention discloses a bistatic forward-looking synthetic aperture radar motion error estimation method, which is characterized by, to begin with, carrying out azimuth-slow time decoupling pretreatment on data obtained after range processing, thereby solving the problem of space variant of motion errors; then, establishing an optimization model based on a maximum image strength criterion; and finally, solving the optimization model by utilizing a block-coordinate descent method. Compared with the prior art, the method can accurately estimate motion errors and obtain a well-focused bistatic forward-looking SAR image, thereby solving the problem that an existing motion error estimation algorithm fails to take the problem of movement orientation space variant into consideration, and realizing accurate motion error estimation and good focusing of the bistatic forward-looking synthetic aperture radar.

Description

technical field [0001] The invention belongs to the field of radar technology, in particular to a bistatic forward-looking synthetic aperture radar motion compensation method in synthetic aperture radar (SAR) imaging technology. Background technique [0002] Synthetic aperture radar is a high-resolution imaging radar. Compared with optical sensors, SAR has the unique advantage of being able to work around the clock. With the development and improvement of SAR technology, its resolution is getting higher and higher. At present, it is close to or surpasses the resolution of optical imaging, so it is widely used in the fields of earth remote sensing, ocean research, resource exploration, disaster prediction and military reconnaissance. . [0003] The transmitter and receiver of bistatic forward-looking SAR work on side-looking and forward-looking respectively, and different transceiver devices have the characteristics of long range, strong anti-interference, and imaging of for...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S13/90
CPCG01S13/904G01S13/9043G01S13/9058
Inventor 蒲巍武俊杰李云莉杨建宇黄钰林李文超杨海光杨晓波
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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