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Passive imaging system based on GPS multi-star irradiation and ground single station receiving

An imaging system and ground technology, applied in the radio wave measurement system, using re-radiation, radio wave reflection/re-radiation, etc., can solve the problem of limited resolution in the distance direction, achieve low observation cost and reduce computational complexity , the effect of improving computational efficiency

Inactive Publication Date: 2015-04-29
HEFEI UNIV OF TECH
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Problems solved by technology

[0004] The purpose of the present invention is to disclose a microwave passive imaging system based on the irradiation of multiple GPS satellites and received by a single ground fixed station. By increasing the number of satellite irradiation sources, the imaging resolution is improved to solve the problem of limited range resolution in narrowband systems. limit problem

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  • Passive imaging system based on GPS multi-star irradiation and ground single station receiving

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[0018] A passive imaging system based on the illumination of multiple GPS satellites and reception by a single fixed ground station. Multiple GPS satellites are used as non-cooperative illumination sources. A single receiving station fixed on the ground simultaneously receives the direct wave signals of multiple GPS satellites and the target. The reflected wave signal after reflection is then used to invert the target image using matched filtering method; figure 1 As shown, the receiving station is composed of five parts: direct wave antenna 1, direct wave receiver 2, reflected wave antenna 3, reflected wave receiver 4, and image inversion module 5. The direct wave antenna 1 can simultaneously receive multiple GPS satellites. Direct wave signal, the direct wave receiver 2 is used to amplify and convert the signal received by the direct wave antenna into a direct wave baseband signal. The antenna beam of the reflected wave antenna 3 is aimed at the observed area, and the GPS satel...

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Abstract

The invention discloses a passive imaging system based on GPS multi-star irradiating and ground single station receiving. In the invention, a plurality of GPS satellites are taken as non-cooperative irradiation sources; a single receiving station fixed on the ground simultaneously receives direct wave signals of the GPS satellites and reflecting wave signals which are reflected by a target and performs a coherent processing to direct waves and reflecting waves; a matching filter method is utilized to invert a target image. The passive imaging system based on the GPS multi-star irradiating and ground single station receiving has the advantages that only a single ground fixing receiving station can finish observation imaging, the cost is low, the complete phase information is maintained during image inversion based on matched filtering, and the terrain deformation information can be extracted through interference processing, so that the passive imaging system based on the GPS multi-star irradiating and ground single station receiving is suitable for being taken as a supplement for SAR and other traditional manners of imaging over the ground and can be widely used for low cost monitoring and predicting in high risk regions, such as landslide body, debris flow, snow slide and the like.

Description

Technical field [0001] The invention relates to the field of microwave passive imaging, in particular to a passive imaging system based on the illumination of multiple GPS satellites and reception by a single ground fixed station. Background technique [0002] Microwave remote sensing imaging technology has the advantages of all-weather and all-weather, and has always been an important means of earth observation and imaging. With the continuous development of radar technology and the continuous improvement of application requirements, a variety of novel imaging systems have emerged in the past ten years. Space-Surface SAR (SS-SAR) based on satellite illumination and ground station reception is one of them. SS-SAR is a passive radar with good concealment and anti-jamming capabilities. These unique advantages of SS-SAR make it an emerging direction in the development of current imaging radars. The Global Positioning System (GPS) has a large number of satellites, high orbital heigh...

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Application Information

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IPC IPC(8): G01S13/89
CPCG01S7/352G01S13/003G01S13/885G01S13/89G01S13/9058
Inventor 尹治平杨军戚仁涛
Owner HEFEI UNIV OF TECH
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