BP wideband synthesis method based on MIMO image domain

A synthesis method and technology in the image domain, applied in the direction of radio wave reflection/re-radiation, utilization of re-radiation, measurement devices, etc., can solve problems such as reducing the amount of computation

Active Publication Date: 2013-12-25
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Problems solved by technology

Compared with the existing broadband synthesis method in the data domain, this method greatly simplifies the channel inconsistency error compensation steps in the broadband synthesis process, avoids the tedious problem of sub-band overlap error correction caused by data domain synthesis, and reduces the High-resolution imaging in the range direction of SAR is achieved while reducing the amount of computation

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  • BP wideband synthesis method based on MIMO image domain
  • BP wideband synthesis method based on MIMO image domain
  • BP wideband synthesis method based on MIMO image domain

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Embodiment Construction

[0074] The present invention mainly adopts the method of computer simulation to verify, and all steps and conclusions are verified correctly on MATLAB-R2010b. The specific implementation steps are as follows:

[0075] Step 1. Initialization of relevant parameters for the BP broadband synthesis method based on the MIMO image domain

[0076] The initialization parameters are all known, and the initialization parameters are as follows: all coordinates are given in the form of Cartesian coordinates; the speed of light is C=3×10 8 m / s; the radar transmits a linear frequency modulation signal, the pulse repetition frequency is recorded as PRF, PRF=500Hz, and the pulse repetition period is recorded as PRI, The number of MIMO antennas is N=3, that is, the radar transmits 3 narrowband (subband) chirp signals with center frequency steps in each pulse repetition period, and these 3 antennas are also used to receive echoes reflected by their respective signals ; The bandwidth of each s...

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Abstract

The invention discloses a BP wideband synthesis method based on an MIMO image domain. The method is characterized by including the steps of first, transmitting LFM signals with stepped center frequency at the same time by using a plurality of transmitters in an MIMO system, carrying out BP imaging on all received narrow-band echo signals to obtain all low-resolution sub-images, and then carrying out image domain coherent superposition on the multiple low-resolution sub-images to obtain high-range-resolution SAR images. Compared with an existing wideband synthesis method based on a data domain, the BP wideband synthesis method based on the MIMO image domain has the advantages that the step of channel inconsistency error compensation in the wideband synthesis process is greatly simplified, the problem of troublesome sub-band superposition error correction caused by synthesis in the data domain is avoided because wideband synthesis is carried out in the image domain, computing amount is reduced, and high-range-resolution SAR imaging is achieved at the same time. The method can be applied to the technical field of high-range-resolution SAR imaging when system hardware conditions (the instantaneous transmission bandwidth of a transmitting terminal and the sampling rate of a receiver) are limited.

Description

Technical field: [0001] The invention belongs to the technical field of synthetic aperture radar (Synthetic Aperture Radar, SAR) high-resolution imaging, and it particularly relates to the SAR range-to-high-resolution imaging under the condition of limited system hardware conditions (transmitter instantaneous transmission bandwidth and receiver sampling rate) technical field. Background technique: [0002] Synthetic aperture radar is a microwave imaging radar with high resolution. It has the advantages of all-weather and all-weather work, and has certain vegetation and ground penetration capabilities, so it is widely used in military and civilian fields. In military reconnaissance, geological census, topographic mapping and mapping, disaster forecasting, etc., in order to obtain more information in the observation area, high-resolution imaging of the observation area is required. Achieving high resolution has always been an important goal of SAR development. SAR uses the mo...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S13/90
Inventor 张晓玲王辉胡克彬师君
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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