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Non-parallel track compensation method of distributed satellite SAR (Synthetic Aperture Radar) system

A compensation method and distributed technology, applied in the target field, can solve problems such as inapplicability, and achieve the effect of accurate speed measurement and positioning results

Inactive Publication Date: 2012-10-24
XIDIAN UNIV
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Problems solved by technology

However, this method is only applicable to the case where the distributed satellite configuration only has an along-track baseline, and is not applicable to the case where there are both along-track baselines and vertical track baselines

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  • Non-parallel track compensation method of distributed satellite SAR (Synthetic Aperture Radar) system
  • Non-parallel track compensation method of distributed satellite SAR (Synthetic Aperture Radar) system
  • Non-parallel track compensation method of distributed satellite SAR (Synthetic Aperture Radar) system

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Embodiment Construction

[0032] The present invention will be further described below in conjunction with the accompanying drawings.

[0033] refer to figure 1 , the specific implementation steps of the present invention are as follows:

[0034] Step 1. Fitting the track equation.

[0035] The main and auxiliary satellite position measurement data are the GPS measurement values ​​of the satellite's X, Y, and Z position coordinates in the earth-centered inertial coordinate system. In a very short imaging time, the motion track of the satellite can be approximated by a low-order polynomial model with time t as a parameter. The solution of the coefficients of the polynomial can be obtained by fitting the GPS position measurement data by the processing system using the commonly used least square method. Considering that the GPS measurement errors are correlated in a short period of time in practice, better fitting performance can be obtained by using the total least squares method.

[0036] Take the f...

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Abstract

The invention discloses a non-parallel track compensation method of a distributed satellite SAR (Synthetic Aperture Radar) system, mainly solving the problems on non-parallel track compensation and along-track base line calculation of the distributed satellite SAR system. The implementation process of the non-parallel track compensation method of the distributed satellite SAR system comprises thefollowing steps of: fitting the measurement data of an ephemeris position by adopting total least squares, to obtain a time parameter equation of a satellite track within an imaging time slot; resampling a track position to obtain a track position coordinate of the impulse transmission time of each direction; structuring a time parameter equation of a new concomitant satellite track parallel to aprimary satellite track; compensating concomitant satellite echo data to obtain echoes equivalent to the echoes received along the new concomitant satellite track parallel to the primary satellite track; and calculating the length of the along-track base line. By means of the non-parallel track compensation method provided by the invention, the influence of measurement errors of a GPS (Global Position System) with short-range dependence can be overcome by fitting the measurement data of the ephemeris position, an image pair with higher dependence can be provided for GMTI (Ground Moving TargetIndication) clutter suppression and the accurate along-track base line can be provided for the velocity measurement and the positioning of a moving target.

Description

technical field [0001] The invention belongs to the technical field of target detection, and further relates to a non-parallel track compensation method of a distributed satellite SAR system, which can be applied to a distributed satellite synthetic aperture radar ground moving target detection SAR-GMTI. Track compensation can improve the correlation of complex image pairs required for ground moving target detection by distributed satellite synthetic aperture radar, and can also provide accurate along-track baselines for moving target speed measurement and positioning. Background technique [0002] When performing distributed satellite SAR-GMTI processing, it is necessary to perform elevation interferometric phase compensation on the imaging results of the receiving satellite, so that the airspace guidance of each channel is approximately the same. In order to overcome the influence of non-parallel satellite tracks on the elevation interferometric phase compensation in the d...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S7/41G01S13/90
Inventor 廖桂生杨志伟束宇翔
Owner XIDIAN UNIV
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