Wide band rader utilizing multi-transmitting and multi-receiving frequency division signal and imaging method thereof

Abstract

The invention relates to a wideband radar imaging method using multiple transmitters and multiple receivers of frequency division signals, which includes the following steps: M array elements of a radar transmitter synchronously transmit M frequency subband signals; 2) the radar receiver consists of N receiving array elements Each receiving array element is configured with M receiving channels corresponding to the above-mentioned M transmit sub-band signal frequency bands, thereby obtaining a total of M×N echo signals; 3) For the M×N echo signals obtained by the receiving array Perform signal processing to complete target detection, and synthesize multiple echoes into a high-resolution range image at the azimuth and distance of the detected target. The present invention uses multi-channel narrowband signals to synthesize broadband signals through multi-transmit and multi-receive technology, thereby reducing the instantaneous bandwidth requirements of the radar system; at the same time, through the combination of multi-transmit and multi-receive technology and array technology, the multi-transmit and multi-receive broadband imaging radar has electronic scanning capabilities. Multiple target detection, tracking and imaging functions can be completed in parallel.

Description

technical field [0001] The invention belongs to the technical field of radar, in particular, the invention relates to a broadband radar and an imaging method thereof. Background technique [0002] With the development of radar imaging technology, such as synthetic aperture radar (SAR), inverse synthetic aperture radar (ISAR), and radar identification technology, the distance resolution required by radar is getting higher and higher, so the required radar signal bandwidth is getting higher and higher. bigger and bigger. How to realize the transmission and reception of broadband signals has always been a difficult point in radar system design, and it is also a standard to distinguish many radar working systems. According to different broadband signal generation and signal processing methods, the methods for obtaining broadband signals and high-resolution one-dimensional range images can be divided into three categories: the imaging method using the step frequency hopping syst...

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to combine the idea of ​​multi-transmitting and multi-receiving frequency-division signals with broadband imaging radar, increase the repetition frequency of the radar system to overcome the defect of poor imaging quality of maneuvering targets, and provide A multifunctional radar system capable of simultaneous detection, tracking and imaging and its imaging method

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