Broadband tunable dual-chirped radar pulse generator based on microwave photonics technology

Abstract

The invention discloses a broadband tunable double-chirp radar pulse generator based on a microwave photon technology. The radar pulse generator can be applied to the field of pulse compression radars. According to the radar pulse generator, femtosecond laser pulses output by a mode-locked laser are divided into three routes, the three routes of pulses go through different chromatic dispersion devices and time delay devices respectively, are combined together through an optical combiner and mutually interfere in the high-speed photoelectric detector detection process, and finally broadband tunable double-chirp radar pulses are generated. The chirp pulses are generated through a microwave photon method, therefore, the output pulses have the large broadband, and then improvement of the distance resolution of a pulse compression radar is promoted; the generated pulse center frequency can be determined through the delay capacity of an electronically-controlled optical fiber delay line, and the tunable advantage is achieved; meanwhile, the device has the excellent advantages of being low in loss and resistant to electromagnetic interference.

Description

technical field [0001] The present invention relates to the field of microwave photons and modern pulse radar, in particular to a broadband tunable double-chirped radar pulse generator based on microwave photon technology Background technique [0002] In modern pulse compression radar systems, the radar needs to transmit a class of pulses with a relatively large duration and bandwidth. Matched filter processing is performed after receiving the radar pulse echo. The pulse processed by the matched filter will be compressed, and the distance and speed information of the target can be obtained by processing and analyzing the compressed echo. In the radar system, the finally obtainable target position resolution (Range resolution) is proportional to the bandwidth of the transmitted pulse, and the target Doppler velocity resolution (Doppler resolution) is proportional to the pulse time length, so this kind of The pulse needs to have a large time and bandwidth at the same time. ...

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Problems solved by technology

[0004] However, when linear chirped pulses are applied to radar systems, a new problem arises: the range-Doppler coupling phenomenon

However, this method requires a high-frequency radio frequency source (10GHz) radio frequency signal source, and the generated pulse bandwidth is limited by the electronic signal generator, so it still cannot achieve high bandwidth and high distance resolution.

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