Linear array antenna orthogonal frequency division mimo-sar transceiver device and method

Abstract

The invention discloses a linear array antenna orthogonal frequency division MIMO-SAR transceiving device and method. The device comprises an MIMO transceiving controller, a reference frequency source, a waveform generator, a local oscillator signal generating module, an orthogonal modulation module, a multi-channel transmitter and a multi-channel receiver, wherein the reference frequency source generates reference signals, the waveform generator generates sub-pulse base band linear frequency modulation signals according to the reference signals, the local oscillator signal generating module generates a plurality of paths of intermediate frequency local oscillator signals and a plurality of paths of radio frequency local oscillator signals according to the reference signals, the orthogonal modulation module performs orthogonal modulation on the sub-pulse base band linear frequency modulation signals and one path of intermediate frequency local oscillator signal so that a plurality of paths of intermediate frequency signals can be generated, the multi-channel transmitter performs frequency mixing on the paths of intermediate frequency signals and the paths of radio frequency local oscillator signals so that a plurality of paths of radio frequency signals can be generated, the paths of radio frequency signals are sent to linear transmitting array antennas at the same time, the multi-channel receiver receives a plurality of paths of echo signals from linear receiving array antennas at the same time, orthogonal modulation is performed on the paths of echo signals according to the paths of radio frequency local oscillator signals and the paths of intermediate frequency local oscillator signals, and a plurality of paths of video echo signals are generated. Therefore, simultaneous multi-input multi-output of microwave signals can be achieved.

Description

technical field [0001] The present invention relates to the field of microwave imaging, in particular to a linear array antenna orthogonal frequency division MIMO-SAR (Multiple-Input Multiple-Output-Synthetic Aperture Radar) transceiver device and method. Background technique [0002] Traditional visual, optical or infrared measures are greatly affected by factors such as terrain, weather and day and night, and do not have all-weather and all-weather working capabilities. The airborne array antenna forward-looking imaging system can not only penetrate smoke and fog , clouds and floating dust, etc., and is not affected by weather and climate, and can perform real-time high-resolution imaging of the area in front of the aircraft, and can also provide real ground information for aircraft landing, reconnaissance, search and rescue, and take-off, and enhance aircraft navigation. and transportation and rescue capabilities; in addition, the use of a specific working frequency band ...

AI Technical Summary

Problems solved by technology

First of all, under the same working conditions, the time-sharing transmission and reception method needs to increase the pulse repetition frequency of the system, thereby reducing the unambiguous imaging distance of the system, which is not conducive to the realization of large-width imaging; secondly, due to the influence of platform movement, time-sharing transmission and reception makes conventional data The acquisition mode "go-stop-go" is no longer established, which causes the complexity of imaging processing and motion compensation; finally, due to the use of microwave switch networks for time-sharing single-send and single-receive or single-send and multiple-receive working methods, the time for a single data acquisition Longer, the system image refresh rate is relatively small

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