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A Fast Simulation Method for SAR Complex Image Data of Spaceborne Natural Scenes in Repeating Orbits

A technology of natural scene and simulation method, which is applied in the field of fast simulation of SAR complex image data in repeated orbit spaceborne natural scene, can solve problems such as lack of, unfavorable algorithm analysis and verification, lack of prior auxiliary data, etc., to overcome slow speed, shorten The effect of simulation time and high simulation accuracy

Active Publication Date: 2018-12-25
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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  • A Fast Simulation Method for SAR Complex Image Data of Spaceborne Natural Scenes in Repeating Orbits
  • A Fast Simulation Method for SAR Complex Image Data of Spaceborne Natural Scenes in Repeating Orbits
  • A Fast Simulation Method for SAR Complex Image Data of Spaceborne Natural Scenes in Repeating Orbits

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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] like 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 widt...

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Abstract

The invention discloses a method for quickly simulating SAR complex image data of a space-borne natural scene with repeated orbits. The method simulates the SAR satellite orbit, and simulates the ground scene according to the imaging principle of the space-borne SAR satellite and the single-view complex image signal model of the SAR satellite. Directly obtain multiple repeated track SAR complex image data. A fast method is used to iteratively calculate the satellite zero-Doppler imaging position to obtain the slant range information, a simplified scattering model is used to calculate the backscatter coefficient, and a simplified repeated orbit model is proposed to generate any number of SAR complexes with controllable baseline length. image data. The invention overcomes the disadvantage of slow speed of the traditional echo simulation method, and can also provide prior information for interference processing to assist processing or evaluate processing results.

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 rapidly 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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Patent Type & Authority Patents(China)
IPC IPC(8): G06F17/50
CPCG06F30/367
Inventor 徐华平单乐
Owner BEIHANG UNIV
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