Telescopic array type portable MIMO-SAR (multiple-input multiple-output synthetic aperture radar) measurement radar system and imaging method thereof

Abstract

The invention discloses a telescopic array type portable MIMO-SAR (multiple-input multiple-output synthetic aperture radar) measurement radar system and an imaging method thereof. The system comprises a telescopic MIMO antenna array, a radar transmitting/receiving machine, a control and processing computer, a liftable antenna frame and the like. The system has the advantages in an aspect of meeting field diagnosis and measurement of scattering properties in using and maintenance processes of a low detectable target that firstly, quick detection, positioning and imaging diagnosis of an abnormal scattering part of the low detectable target can be realized, that is, an MIMO-SAR different from a linear guiderail SAR in mechanical scanning imaging can finish high-resolution two-dimensional imaging of a measured target through one-time or two-time 'snapshot' electric scanning imaging; secondly, the requirement on a target test site environment is lowered, that is, guide rails for precision mechanical screening measurement do not need to be mounted in a target test site, so that the requirement on the site test environment in imaging diagnosis and measurement operation processes is greatly lowered; thirdly, the antenna array is telescopic, so that miniaturization, quick unfolding and folding as well as portability of the measurement radar system can be easily realized.

Description

technical field [0001] The invention relates to the technical field of communication and synthetic aperture imaging radar, in particular to an array retractable portable MIMO-SAR measurement radar system and an imaging method thereof. Background technique [0002] Existing imaging measurement radars for electromagnetic scattering diagnosis of low detectable targets mainly include inverse synthetic aperture radar (ISAR) using turntable rotating target measurement and synthetic aperture radar (SAR) imaging system using linear guideway mechanical scanning measurement. For the diagnostic measurement of the scattering characteristics of real low-detectable targets, ISAR imaging requires the construction of a dedicated target turntable and support system, through the mechanical rotation of the turntable to synthesize the imaging aperture, to achieve high-resolution imaging measurement of the target azimuth [see Literature 1-3] Linear guide rail scanning SAR imaging needs to build ...

AI Technical Summary

Problems solved by technology

[0009] Disadvantages of prior art 1: the background level of this type of test field is well designed and precisely controlled, and has high RCS and high-resolution imaging diagnostic measurement accuracy, but due to the need to install the measured target on a low-scattering metal target bracket on, such as figure 2 As shown, it requires to reserve the installation hole of the target turntable on the target to be measured, which will destroy the inherent structure of the target to a certain extent, so it is only suitable for target model or prototype measurement, and cannot be used in the production stage of low detectable targets. factory acceptance and maintenance measurements during target operational use

[0013] Disadvantages of the existing technology 2: the test facility is huge and precise, so it is only suitable for the manufacturer's delivery inspection and verification, and cannot be used for the maintenance, measurement and diagnosis of low detectable targets in the combat use of the army

[0018] Shortcomings of prior art 3: In fact, so far, all the radars reported in the data for the RCS diagnostic imaging measurement of the target in the field of combat all adopt the target to be placed in a fixed position, and the measurement radar scans the guide rail in a straight line to complete the target detection. high resolution SAR imaging

[0019] (1) Poor real-time performance: It takes a long time to perform high-resolution diagnostic imaging on a real target (for example, if the target size is 20m and the imaging resolution is 10cm, at least 201 scans are required, and the measurement time needs at least 1-2 hours), it is difficult to achieve rapid diagnostic imaging measurement;

[0020] (2) High requirements for the test site environment: In order to obtain high lateral distance resolution, the linear scanning guide rail is required to be long enough and the mechanical scanning accuracy is high enough, which puts forward higher requirements for the on-site test site;

[0021] (3) Poor portability: a complete set of measuring equipment is relatively large, it is difficult to realize miniaturization, and the portability is poor

[0024] Disadvantages of prior art 4: The existing proposed MIMO-SAR technology does not solve the compatibility problem between radar system portability and high-resolution imaging diagnostic measurement-if high resolution is required, the antenna array of MIMO-SAR It must be long and large in size; if portability is required, the antenna array should not be too long, and the imaging measurement resolution is low at this time

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