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Method for calibrating airborne interference synthesis aperture radar (SAR) under squint condition

A calibration equation and calibration technology, applied in the field of radar detection, can solve problems such as unstable and unreasonable calibration results and insufficient calibration accuracy, so as to reduce the number of calibration points, enhance stability and reliability, reduce effect of change

Active Publication Date: 2013-07-17
济钢防务技术有限公司
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Problems solved by technology

[0009] The purpose of the present invention is to overcome the defects of the prior art, to solve the problems of insufficient calibration accuracy and unstable and unreasonable calibration results in the airborne interferometric SAR calibration under the squint condition, and to propose an airborne interferometric SAR calibration under the squint condition. Interferometric SAR Calibration Method

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  • Method for calibrating airborne interference synthesis aperture radar (SAR) under squint condition
  • Method for calibrating airborne interference synthesis aperture radar (SAR) under squint condition
  • Method for calibrating airborne interference synthesis aperture radar (SAR) under squint condition

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[0020] For the convenience of description, firstly, the squint geometry of airborne interferometric SAR is explained, such as figure 1 As shown, A m and A s Respectively represent the main antenna and auxiliary antenna installed on the airborne interferometric SAR aircraft platform, B represents the physical baseline formed by the distance between the main and auxiliary antennas, XOY represents the geodetic reference plane, and the aircraft along A m Flying on the X′ trajectory, the height coordinates of the aircraft from the ground are H, A m X' is parallel to OX, the height coordinate of the ground target P is h, and the main antenna A m and the slant distances between the sub-antenna and the target P at the crossing moment of the beam center are R 1 and R 2 , P to track A m The shortest distance from X is R 0 , A m X' and A m P' are perpendicular to each other, A m P' is the main antenna's side-view direction, and the angle between the beam center of the main anten...

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Abstract

The invention discloses a method for calibrating an airborne interference synthesis aperture radar (SAR) under the squint condition. By the method, the problems of insufficient calibration accuracy and unstable and unreasonable calibration result in the calibration of the airborne interference SAR are solved. The method comprises the following steps of: calculating squint angles at which calibration points are positioned by geometrical relationship between the calibration points and a main antenna; establishing a system delayed calibration equation under the squint condition according to processing geometry which is adopted in a squint SAR imaging algorithm, and completing the calibration of system delay by utilizing the obtained squint angles; establishing a target elevation equation under the squint condition according to the squint geometrical relationship of the interference SAR, solving partial derivatives of interference parameters to obtain an elevation sensitivity equation, and establishing a squint interference calibration model; and substituting initial interference parameters, airborne interference SAR elevation measuring values and elevation information of the calibration points into the squint interference calibration model to obtain a calibration equation set, so that interference parameter errors are calculated.

Description

technical field [0001] The invention belongs to the technical field of radar detection, and in particular relates to an airborne interferometric SAR calibration method under squint conditions. Background technique [0002] There are various errors in the actual airborne interferometric synthetic aperture radar (Synthesis Aperture Radar: SAR) system equipment and the airborne motion platform itself, and bring about the basic interference parameter error of interferometric SAR measurement, and the uncertainty of system sampling delay causes system delay Errors; baseline structure installation will cause installation and measurement errors in baseline length and baseline inclination, and will vary with the attitude of the carrier aircraft; interferometric SAR dual receiving channel phase errors will affect the accuracy of elevation measurement. In order to realize the high-precision mapping of the airborne interferometric SAR system, interferometric SAR calibration becomes an i...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S7/40
Inventor 王宇梁兴东丁赤飚
Owner 济钢防务技术有限公司
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