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Airborne scanning radar imaging method in iteration compression mode

A scanning radar, compressed mode technology, applied in the radar field, can solve the problems of position deviation, affecting targets, false targets, etc.

Active Publication Date: 2015-06-10
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When there are multiple targets in the scene, this method will cause target amplitude distortion, position offset, and false targets due to noise amplification. These phenomena will affect the performance of target detection, positioning and recognition, and bring serious consequences to practical applications.

Method used

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  • Airborne scanning radar imaging method in iteration compression mode
  • Airborne scanning radar imaging method in iteration compression mode
  • Airborne scanning radar imaging method in iteration compression mode

Examples

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Embodiment Construction

[0079] The present invention uses simulation experiments to demonstrate, and all steps and conclusions are verified correctly on Matlab2012. The following is a further detailed description of the specific implementation of the present invention.

[0080] Step 1: Initialization of imaging system parameters

[0081] The imaging geometry used in this simulation is as follows figure 2 As shown, the system coordinate system takes the radar projection on the ground directly below as the coordinate origin of the top view, the radar platform moves along the X-axis at the speed V, the radar antenna scans the area directly in front of the platform with the angular velocity ω, and the Y-axis is the cut track direction, Z is the vertical ground direction. The corresponding radar imaging system parameters are shown in Table 1.

[0082] Table 1

[0083]

[0084] The imaging scene used in this example is as follows image 3 As shown, the dots on the way are 2×5 point targets arranged...

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Abstract

The invention discloses an airborne scanning radar imaging method in an iteration compression mode. The airborne scanning radar imaging method is characterized in that an azimuth-direction super-resolution imaging back model is built under the Bayesian theory framework, and the model built under the Bayesian theory can effectively fuse prior information of a target. When the super-resolution imaging back model is built, the assumption of a radar imaging basic idea on the noise statistical property is followed, and the Gaussian distribution function is adopted in the model to describe the noise statistical property. Due to the fact that target scattering has sparsity relative to an imaging background, the prior information of target scattering is described through the Laplace distribution function, radar super-resolution imaging is precisely converted into the maximum posterior probability problem in mathematics, corresponding target information when the posterior probability is maximum is solved, then the target information is reconstituted, and therefore the radar super-resolution imaging is achieved.

Description

technical field [0001] The invention belongs to the technical field of radar, and particularly relates to airborne pulse Doppler radar forward-looking scanning imaging, helicopter radar circular scanning omnidirectional imaging, and spacecraft rendezvous and interface scanning imaging. Background technique [0002] Radar can penetrate clouds and rain and is not restricted by the sun's rays, and has the ability to detect and search the ground and ocean all-weather and all-day. indispensable important role. [0003] Airborne scanning radar enables the radar beam to scan the detected area uniformly in azimuth by means of mechanical rotation during the flight of the aircraft. Using the time relationship of the radar antenna swept the target sequence, through the effective processing of the echo data, the reflection information of the target in the spatial azimuth can be obtained, so as to achieve the purpose of detecting and imaging the ground or ocean. Because the airborne sc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S13/89
CPCG01S7/41G01S13/89
Inventor 黄钰林查月波张寅武俊杰蒋文杨建宇
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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