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Method for offline acquisition of airborne InSAR (Interferometric Synthetic Aperture Radar) motion error by utilizing high-precision POS (Position and Orientation System)

A motion error, high-precision technology, applied in the direction of utilizing re-radiation, reflection/re-radiation of radio waves, radio wave measurement systems, etc. stripes and other problems, to achieve the effect of high precision, high precision offline imaging, and simple calculation

Inactive Publication Date: 2012-04-25
BEIHANG UNIV
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Problems solved by technology

However, for airborne InSAR, the self-focusing method will destroy the interference fringes, making it impossible for InSAR to achieve height accuracy measurement
Therefore, the airborne InSAR cannot adopt the motion error compensation method combining autofocus and POS, and there is an urgent need for a method that can accurately obtain the motion error of the airborne InSAR

Method used

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  • Method for offline acquisition of airborne InSAR (Interferometric Synthetic Aperture Radar) motion error by utilizing high-precision POS (Position and Orientation System)
  • Method for offline acquisition of airborne InSAR (Interferometric Synthetic Aperture Radar) motion error by utilizing high-precision POS (Position and Orientation System)
  • Method for offline acquisition of airborne InSAR (Interferometric Synthetic Aperture Radar) motion error by utilizing high-precision POS (Position and Orientation System)

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Embodiment Construction

[0027] Such as figure 1 As shown, the specific implementation of the present invention includes the following steps:

[0028] 1. Under the premise of obtaining the SINS data and GPS data recorded by POS, the method of "forward Kalman filtering + backward smoothing" is used to fuse the SINS data and GPS data recorded by POS to obtain the combined measurement of the SINS center As a result, including position, velocity and attitude, the idea of ​​the "forward Kalman filtering + backward smoothing" data processing method is: at time T 0 -T n Inside, use forward Kalman filtering and store the estimation and variance matrix (including P k , P k+1, k , K k , Φ k+1, k ), after the current Kalman filter is completed, the smoothing equation is used and all the stored estimates and the variance matrix information are used in reverse order to obtain the smoothed And P k / n ;

[0029] ①The specific formula of forward Kalman filtering is as follows:

[0030] ●System state equation:

[0031] ...

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Abstract

The invention relates to a method for offline acquisition of an airborne InSAR (Interferometric Synthetic Aperture Radar) motion error by utilizing a high-precision POS (Position and Orientation System). The method comprises the steps of acquiring location information of and below quadratic term, of an SINS (Ship's Inertial Navigation System) center by utilizing a combined measurement result of the SINS and a GPS (Global Positioning System) in the high-precision POS; acquiring location information above the quadratic term, of the SINS center by employing a purely inertial measurement result of the SINS; adding the calculated location information of and below the quadratic term to the calculated location information above the quadratic term and compensating a lever arm effect error; calculating high-precision smooth location information of two antenna phase centers of the airborne InSAR; then, subtracting a first-order polynomial fitting result from the high-precision smooth location information; and finally acquiring the motion error of the two antennas of the airborne InSAR. The method provided by the invention has the characteristics of high precision and simplicity for calculation, and can be used for offline calculation of the motion error of the airborne high-precision InSAR in order to realize high-precision offline imaging for the airborne InSAR.

Description

Technical field [0001] The invention relates to a method for acquiring the motion error of an airborne InSAR by using a high-precision position and orientation measurement system (Position and Orientation System, POS) with a position measurement accuracy of centimeter level and a posture measurement accuracy of 10" level. Background technique [0002] Airborne synthetic aperture radar (Synthetic Aperture Radar, SAR) is an advanced means of earth observation. Compared with optical earth observation equipment, airborne SAR has the characteristics of all-weather, all-weather, long range, etc., and has certain penetration to ground vegetation, artificial camouflage and even surface soil layers. It has become the most representative in the world today. One of the earth observation methods. In particular, the airborne high-precision InSAR can carry out three-dimensional surveying and mapping. It has important applications in the fields of national basic surveying and mapping, land and...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S7/40G01S13/90
Inventor 刘百奇房建成钟麦英韩晓英曹全
Owner BEIHANG UNIV
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