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Synthetic aperture radar (SAR) Doppler parameter estimation method based on POS and DEM data

A technology of Doppler parameters and data, applied in the field of radar data processing, can solve problems such as low estimation accuracy

Active Publication Date: 2013-01-09
CHINESE ACAD OF SURVEYING & MAPPING
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Problems solved by technology

[0013] The present invention aims to solve the problem that the estimation accuracy of Doppler parameters in the center of the SAR beam is relatively low under the conditions of large oblique viewing angle, non-stationary flight and complex terrain in the current SAR antenna, and provides a method using POS measurement data and DEM data. Estimate the Doppler parameters of SAR signals, and improve the estimation accuracy of parameters under non-front-looking, non-stationary aircraft flight and complex terrain conditions, which is of great significance to airborne SAR imaging under complex conditions

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  • Synthetic aperture radar (SAR) Doppler parameter estimation method based on POS and DEM data
  • Synthetic aperture radar (SAR) Doppler parameter estimation method based on POS and DEM data
  • Synthetic aperture radar (SAR) Doppler parameter estimation method based on POS and DEM data

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[0043] The present invention solves the ground target position through GPS, IMU (inertial measurement unit) and terrain data, and then solves the Doppler parameter. Specifically, it is implemented through a computer. For the implementation process, see the attached figure 1 , the Doppler parameter estimation is achieved by the following steps:

[0044] Step 1. Determine the corresponding time t at which the Doppler parameters need to be solved, and obtain the GPS antenna position, velocity, acceleration, and attitude parameters of the platform at this time according to the interpolation of the measured values ​​of the GPS and IMU on the carrier aircraft, and the GPS antenna position obtained according to the interpolation[ x GPS ,Y GPS ,Z GPS ], the attitude of the sensor platform, and in the coordinate system of the sensor platform, the offset [eXs, eYs, eZs] of the center of the SAR (Synthetic Aperture Radar) antenna relative to the center of the GPS antenna, calculate the...

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Abstract

The invention relates to a synthetic aperture radar (SAR) Doppler parameter estimation method based on POS and DEM data. According to the method, onboard GPS navigation data, IMU attitude bases and digital altitude data, target locations of reflected signals are calculated according to a range equation and a coplanarity equation and by considering earth ellipsoid data of ground altitude data, and Doppler information of the wave beam center is estimated according to a sensor state and target location information. According to the method, high-precision estimation can be fully performed on the onboard SAR wave beam center Doppler parameters under non-side-looking, non-stable flying and complex ground terrain conditions, and the method has important effects in the fields of SAR signal processing and imaging.

Description

technical field [0001] The invention belongs to the field of radar data processing, and in particular relates to the estimation of Doppler parameters of the radar beam center. Background technique [0002] Due to the atmospheric and other interference factors during the flight, non-uniform straight-line flight in complex terrain environment has a great impact on the estimation accuracy of Doppler parameters, and the estimation accuracy of SAR Doppler parameters will affect the SAR imaging focus , leading to an increase in noise and blur, and in severe cases, it will also affect the quality of the image. Although there are many methods for SAR Doppler center frequency estimation, most of them are based on the same basic principle: using the large time-width-bandwidth product characteristic of the SAR system, the Doppler frequency and the azimuth time have a definite corresponding relationship, and the echo The energy on a Doppler frequency must come from a target in a specif...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S7/41G01S13/90
Inventor 程春泉黄国满燕琴骆成凤孙钰珊
Owner CHINESE ACAD OF SURVEYING & MAPPING
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