Method for compensating lever arm error of onboard synthetic aperture radar

A synthetic aperture radar, error compensation technology, applied in the direction of reflection/re-radiation of radio waves, use of re-radiation, measurement devices, etc., can solve the problem of not giving the implementation method of lever arm error compensation, and not considering the azimuth component of lever arm error. And other issues

Inactive Publication Date: 2012-01-04
NAT UNIV OF DEFENSE TECH
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Problems solved by technology

However, this literature only analyzes the influence of the range component of the lever arm error on the accuracy of airborne SAR motion compensation, without considering the azimuth component of the lever arm error; secondly, it only gives the approximate analysis method of the lever arm error, without giving The specific implementation method of the error compensation of the lever arm

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  • Method for compensating lever arm error of onboard synthetic aperture radar
  • Method for compensating lever arm error of onboard synthetic aperture radar
  • Method for compensating lever arm error of onboard synthetic aperture radar

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Embodiment Construction

[0056] Such as figure 1 , the airborne SAR lever arm error compensation method is divided into six steps, the present invention is further explained below with a certain type of airborne SAR lever arm error compensation example, the steps are as follows:

[0057] Step 1, establish the coordinate system for lever arm error compensation.

[0058] Such as figure 2 , with O 3 is the origin, X b , Y b and Z b Establish the body coordinate system for the axis; 1 is the origin, X g , Y g and Z g Establish the northeast sky coordinate system as the axis; take O 2 is the origin, X i , Y i and Z i Establish an imaging coordinate system for the axes.

[0059] Step 2, calculate the lever arm vector in the body coordinate system.

[0060] Such as figure 2 , the phase center of the airborne SAR antenna is at O 3 At , the motion sensor is installed at M on the back of the carrier along the axis of the carrier, is the lever arm vector, and the measured lever arm vector in ...

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Abstract

The invention provides a method for compensating a lever arm error of an onboard synthetic aperture radar (SAR). The method comprises the following steps of: 1, building a lever arm error compensation coordinate system; 2, calculating a lever arm vector in a body coordinate system; 3 calculating the lever arm vector in an east-north-up coordinate system; 4, calculating the lever arm vector in an imaging coordinate system; 5, compensating a direction component of the lever arm error; and 6, compensating a distance component of the lever arm error. In the invention, forward component of the lever arm vector in the imaging coordinate system of the onboard SAR is calculated, the forward speed of a machine is corrected through the forward component, the direction component of the lever arm error is adjusted and compensated by pulse repetition frequency, and the distance component of the lever arm error is compensated through lateral/normal motion errors of the machine which are measured bylateral/normal component correction sensors. By the method, the accuracy of motion compensation of the onboard SAR can be improved.

Description

technical field [0001] The invention belongs to the technical field of synthetic aperture radar signal processing, and proposes an airborne synthetic aperture radar (Synthetic Aperture Radar, referred to as SAR) lever arm error compensation method to improve the accuracy of airborne SAR motion compensation. Background technique [0002] SAR is an active microwave imaging radar. It has the characteristics of high resolution, long range, mapping bandwidth and all-weather work. It has played a huge role in the military and civilian fields. aspect. Airborne SAR imaging requires the carrier aircraft to move at a constant speed according to the predetermined straight track, but due to the influence of airflow and other factors, the carrier aircraft has motion errors, including: deviation from the straight track and non-uniform motion errors. Motion errors seriously reduce the imaging quality of airborne SAR. In order to achieve high-resolution imaging, motion compensation is requ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S7/40G01S13/90
Inventor 周智敏李悦丽黎向阳严少石李建阳黄晓涛朱国富
Owner NAT UNIV OF DEFENSE TECH
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