Device and method for generating and processing dual-band opposite chirp chirp signal

The dual-band opposite chirped linear frequency modulation signal is generated through dual-band opposite chirped linear frequency modulation signals, which solves the problem of limited carrier bandwidth in the prior art, and achieves the improvement of radar detection accuracy and distance-Doppler resolution capabilities.

CN119716746APending Publication Date: 2025-03-28AIR FORCE UNIV PLA
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Patent Information

Application Number
CN202411794606.7
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-12-09
Publication Date
2025-03-28

AI Technical Summary

Technical Problem

When the prior art generates and processes dual-band linear frequency modulation signals, the carrier bandwidth is limited, affecting radar detection accuracy and distance-Doppler resolution capabilities.

Method used

Electro-optical modulation is realized through a dual-wavelength laser and an electro-optical modulator to generate a modulated optical signal with four chirped optical sidebands. The wavelength interleaver is used to separate the intermediate two chirped optical sidebands for photoelectric conversion, generating a dual-band opposite chirped linear frequency modulation signal, and improving the carrier frequency and bandwidth of the signal through mixing and filtering processing.

Benefits of technology

The carrier frequency improvement and bandwidth expansion of dual-band opposite chirped linear frequency modulation signals are achieved, the distance-Doppler coupling problem is solved, and the radar detection accuracy and distance-Doppler resolution capability are improved.

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Abstract

The device comprises a dual-wavelength laser (1), an electro-optical modulator (2), an arbitrary waveform generator (3), a wavelength interleaver (4), a first photoelectric detector (5), a second photoelectric detector (6), a third photoelectric detector (7), a first frequency mixer (8), a band-pass filter (9), a frequency multiplier (11), a second frequency mixer (10) and a low-pass filter (12). The invention further provides a dual-band opposite chirp chirp signal generating and processing method. According to the invention, carrier frequency lifting, bandwidth expansion and chirp flipping of linear frequency modulation signals are realized based on electro-optical modulation and optical domain filtering, the electronic bottleneck limitation is effectively avoided, the radar detection precision is improved, distance-Doppler decoupling is realized, and the radar detection distance is ensured. According to the invention, the frequency conversion local oscillation signal is provided by using the dual-wavelength optical signal, synchronous frequency conversion and dechirp processing are carried out on the dual-band signal, and the system structure is simple.
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