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A parameter optimization method for variable-parameter large-squint spaceborne spotlight SAR system

A technology of squinting star and variable parameters, which is applied in radio wave measurement system, radio wave reflection/re-radiation, utilization of re-radiation, etc. It can solve the problems of range-wise resolution deterioration and inability to complete imaging processing, etc., and achieve good range-wise The effect of resolution

Active Publication Date: 2018-02-06
BEIHANG UNIV
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Problems solved by technology

However, the data acquisition configuration of large squint will cause the effective range wavenumber bandwidth to be much smaller than the range wavenumber bandwidth at the single azimuth sampling time, which will lead to the deterioration of the resolution in the range direction. In severe cases, the effective range wavenumber bandwidth may be zero. Imaging processing cannot be completed when

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  • A parameter optimization method for variable-parameter large-squint spaceborne spotlight SAR system
  • A parameter optimization method for variable-parameter large-squint spaceborne spotlight SAR system
  • A parameter optimization method for variable-parameter large-squint spaceborne spotlight SAR system

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Embodiment

[0122] The present invention is applied to concrete example, concrete steps are as follows:

[0123] Step 1. Obtain the target scene parameters of the earth observation mission, the basic reference parameters of the radar emission signal and the basic parameters of the radar space sampling, and obtain the signal oversampling factor. The obtained basic parameters are shown in Table 1.

[0124] Table 1. Basic parameters of Earth observation missions with variable parameters and high squint spaceborne spotlight SAR

[0125]

[0126] Step 2. Calculate the SAR system parameters derived from the basic parameters in step 1, including parameters derived from radar emission signals, parameters derived from two-dimensional signal sampling and parameters derived from space sampling. The calculated derived parameters of the radar system are shown in Table 2

[0127] Table 2. Variable parameter high squint spaceborne spotlight SAR Earth observation mission derived parameters

[0128]...

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Abstract

The present invention discloses a parameter optimization design method of a variable parameter high squint satellite-borne beam bunching SAR (Synthetic Aperture Radar) system. The method comprises: obtaining basic parameters of an earth observation task; calculating system parameters derived from the basic parameters; fitting a satellite orbit coordinate polynomial, and estimating the initiation and termination sampling time scales; setting an orientation sampling number, and calculating a sampling time interval and an earth surface drift angle sequence corresponding to a scene center; determining a satellite sampling position sequence, the slope distance sequence of the scene center and a time sampling interval sequence; verifying constraint condition of a point echo interference without transmission pulse shielding and satellite; and calculating the time variant regulation rule of radar platform parameters. According to the invention, a theoretical basis and a realization method are provided for the design requirement of a variable parameter high squint satellite-borne beam bunching SAR system.

Description

technical field [0001] The invention relates to the technical field of synthetic aperture radar (Synthetic Aperture Radar, SAR), in particular to a parameter optimization method of a high squint space-borne spotlight SAR system with variable parameters. Background technique [0002] Spaceborne spotlight SAR is a high-resolution microwave imaging tool for earth observation. The parameter design of the traditional spaceborne SAR system needs to be carried out according to the radar imaging mode, and then the system parameters and spatial geometric configuration of the radar platform are used to select the appropriate imaging Approach. However, for the spaceborne spotlight SAR system in the high squint data acquisition configuration, most imaging processing methods fail due to the strong two-dimensional coupling introduced in the echo signal by the high squint configuration. The Polar Format Algorithm (PFA) has the potential to process large squint spotlight SAR data. It corre...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S13/90
CPCG01S13/904G01S13/9011G01S13/9041
Inventor 李景文王岩孙兵谭林银皓
Owner BEIHANG UNIV
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