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A Method of Improving Cross-polarization Rasr by Full-polarization Spaceborne Topsar

A fully polarized, spaceborne technology, which is applied in the field of interdisciplinary technology of aerospace and microwave remote sensing

Inactive Publication Date: 2015-11-11
NAT UNIV OF DEFENSE TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Based on the TOPSAR working mode, there is no information available on the method of improving cross-polarization RASR

Method used

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  • A Method of Improving Cross-polarization Rasr by Full-polarization Spaceborne Topsar
  • A Method of Improving Cross-polarization Rasr by Full-polarization Spaceborne Topsar
  • A Method of Improving Cross-polarization Rasr by Full-polarization Spaceborne Topsar

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Embodiment Construction

[0046] figure 1 It is a flowchart of the RASR index calculation method of the fully polarized spaceborne TOPSAR provided by the present invention. The whole process is divided into five steps. Taking satellite and radar parameters, wave position information, and target information as input, the first step is to calculate the slope distance as R (i) The parameters of the blurred point include the angle of incidence and antenna gain; the second step is to calculate the parameters of the j-th blurred point, including the angle of incidence, the slant distance and the antenna gain; the third step is to calculate the HH polarization RASR Index, in which, for the convenience of subsequent calculation, the fuzzy weighting coefficient A is also given j The fourth step is to obtain the VV polarization RASR index; the fifth step is to obtain the HV polarization RASR index.

[0047] Figure 2 to Figure 7 It is a schematic diagram and result diagram of a simulation experiment in a laborator...

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Abstract

The invention provides a scanning method for improving cross polarization RASR by employing a complete polarization spaceborne TOPSAR and further provides an acquisition method for RASR indexes. According to the technical scheme, the method comprises steps that: the complete polarization spaceborne TOPSAR firstly emits an H polarization signal to a first sub mapping band and then receives an HH polarization echo and an HV polarization echo reflected by the first sub mapping band; according to the mode in the above step, all the sub mapping bands are scanned completely; the complete polarization spaceborne TOPSAR continuously emits V polarization signals to the first sub mapping band and then receives VH polarization echoes and VV polarization echoes reflected by the first sub mapping band; according to the mode in the above step, all the sub mapping bands are scanned completely to acquire complete polarization data. By utilizing an imaging result acquired in the invention, copolarization RASR indexes and cross polarization RASR indexes can reach same magnitude orders.

Description

Technical field [0001] The invention belongs to the cross-technology field of aerospace and microwave remote sensing, and particularly relates to a method for improving the cross-polarization RASR (Range Ambiguity to Signal Ratio, range ambiguity) index for fully polarized spaceborne TOPSAR (Terrain Observation by Progressive scans Synthetic Aperture Radar, progressive scanning synthetic aperture radar). Background technique [0002] RASR is an important indicator considered in the design of fully polarized spaceborne SAR (Synthetic Aperture Radar) system. In the traditional alternately launched fully polarized spaceborne SAR system, cross-polarized RASR will deteriorate to varying degrees under the influence of the same polarization blur. Take marine targets as an example. Generally, the co-polarization component is more than 20dB higher than the cross-polarization component, and the cross-polarization RASR is severely degraded. If the traditional alternate transmission mode is ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S13/90
CPCG01S7/024G01S13/90G01S13/904G01S13/9076
Inventor 黄海风陈祺石剑董臻余安喜何峰张永胜孙造宇金光虎杜湘瑜何志华李力汪洋林成龙陈筠力陈国忠崔雷
Owner NAT UNIV OF DEFENSE TECH
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