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Rapid simulation method of repeat-pass spaceborne natural scene SAR complex image data

A technology of natural scenes and simulation methods, which is applied in the field of rapid simulation of SAR complex image data of repeated orbital spaceborne natural scenes, can solve the problems of lack of prior auxiliary data, unfavorable algorithm analysis and verification, and lack, and achieves high simulation accuracy and shortened time. Simulation time, overcoming the effect of slow speed

Active Publication Date: 2016-06-15
BEIHANG UNIV
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Problems solved by technology

For InSAR and D-InSAR technologies, multiple repeated satellite orbits with a certain baseline (all ascending orbits or all descending orbits) are required as the data source for the SAR complex image data generated in the same target area, among which PS-DInSAR requires There are more than ten pieces of SAR complex image data, but there is no real spaceborne SAR complex image data for certain scenes or repetitive orbits under imaging conditions, and the current real data generally lack effective priori auxiliary data, which is not conducive to algorithm analysis and verify

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  • Rapid simulation method of repeat-pass spaceborne natural scene SAR complex image data
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  • Rapid simulation method of repeat-pass spaceborne natural scene SAR complex image data

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Embodiment Construction

[0019] The present invention will be further described in detail with reference to the accompanying drawings and embodiments.

[0020] Such as figure 1 As shown, the main flow of the present invention's repeated orbit satellite-borne natural scene SAR complex image data fast simulation method includes the following steps:

[0021] The first step is to read in the orbit parameters, SAR satellite parameters, ground natural scene parameters and image parameters, and determine the satellite orbit imaging center position and the corresponding zero-Doppler imaging ground scene center position:

[0022] 1.1. Read the parameter file in .txt format, in which the satellite orbit parameters include pericentric angular distance ω, orbital inclination i, orbital semi-major axis a, ascending node right ascension Ω, orbital eccentricity e and orbital return pipeline radius; SAR Satellite parameters include wavelength λ, bandwidth Bw, sampling rate fs, ideal repetition frequency Prf, pulse w...

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Abstract

The present invention discloses a rapid simulation method of repeat-pass spaceborne natural scene SAR complex image data. According to the method, an SAR satellite orbit is simulated, the ground scene is simulated according to the spaceborne SAR satellite imaging principle and an SAR satellite single looking complex image signal model, and multi-frame repeat-pass SAR complex image data are directly obtained. Slant-range information is obtained by using a rapid method to iteratively compute a satellite zero doppler imaging position, a backscattering coefficient is calculated by using a simplified scattering model, and a simplified repeat-pass model is provided to generate any multi-frame SAR complex image data with base length controllable. The disadvantage that speed of a traditional echo simulation method is slow is overcome, and prior information can also be provided for interference processing so as to assist in processing or evaluating a processing result.

Description

technical field [0001] The invention belongs to the technical field of space-borne synthetic aperture radar (Synthetic Aperture Radar, SAR), and relates to a method for quickly simulating SAR complex image data of space-borne natural scenes in repeated orbits. Background technique [0002] Synthetic aperture radar satellite is a high-resolution microwave remote sensing satellite that observes the earth based on space height. It has broad application prospects in military, marine, agricultural, forestry and other fields. Many SAR satellites have been launched and have achieved great success. In the development process of SAR satellites abroad, digital simulation technology is generally used to realize the optimal design of the overall scheme of the satellite system. Spaceborne SAR complex image simulation can provide image data with prior knowledge for SAR system error simulation analysis, radar image processing and interferometric SAR technology research, which is of great s...

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Application Information

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IPC IPC(8): G06F17/50
CPCG06F30/367
Inventor 徐华平单乐
Owner BEIHANG UNIV
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