Double-optical-comb multi-frequency-multiplication-factor frequency spectrum spread frequency modulation signal generation system and implementation method thereof

A technology of spectrum spread and FM signal, which is applied in the field of spectrum spread FM signal generation system, can solve the problems of restricting the detection accuracy and resolution ability of the radar system, the deterioration of signal quality, and the complex structure of the system, so as to achieve wide application prospects, improve the detection distance and Resolution, Extended Range Effects
CN110890901AActive Publication Date: 2020-03-17NORTHWESTERN POLYTECHNICAL UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
NORTHWESTERN POLYTECHNICAL UNIV
Publication Date
2020-03-17

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Abstract

The invention provides a double-optical-comb multi-frequency-multiplication-factor frequency spectrum spread frequency modulation signal generation system and an implementation method thereof. A laserand a direct digital synthesizer provide optical carriers and linear frequency modulation signals for a frequency multiplication module. The frequency multiplication module realizes photoelectric conversion and frequency multiplication of electric signals, the optical frequency comb module generates five-line optical frequency combs. Five paths of optical signals are respectively injected into the five PDs connected in parallel for photoelectric detection, the obtained electric signals are subjected to frequency spectrum splicing, and 10 / 20 frequency multiplication linear frequency modulationsignal frequency spectrum expansion can be realized. According to the invention, the generation of high-frequency and large-bandwidth linear frequency modulation signals is effectively realized, andthe method has the characteristics of simple structure, frequency agility and small channel interference. Microwave photonics technology is adopted to fuse the multi-frequency multiplication technology and the optical frequency comb technology so that the range of the carrier frequency and the bandwidth of an original linear frequency modulation signal is expanded, and the requirements for the frequency and the bandwidth of the linear frequency modulation signal are remarkably reduced.
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Description

technical field

[0001] The invention relates to the field of radar detection, in particular to a spectrum spread FM signal generation system and a realization method. Background technique

[0002] The chirp signal has the advantages of large instantaneous bandwidth, high distance resolution and high detection characteristics of moving targets, and is widely used in pulse compression radar and electronic warfare systems. Using a long-lasting broadband chirp signal can transmit more energy with a smaller peak power, avoiding the problem of power saturation in the transmitter in pulse radar, and reducing the requirements for system complexity. Therefore, the use of broadband chirp signals can achieve longer detection range, higher spatial resolution, and lower probability of interception and interference. The traditional chirp signal generation method based on direct digital synthesis (DDS) is limited by the frequency dependence of electronic devices. To generate high-frequenc...

Claims

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