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Reconstructible high-frequency chirped pulse signal generating device and method

A chirped pulse and signal generation technology, applied in the field of reconfigurable high-frequency chirped pulse signal generation devices, can solve the problems of inability to meet the requirements of high frequency and high-precision ranging, narrow bandwidth, and low signal frequency.

Inactive Publication Date: 2016-12-07
HARBIN INST OF TECH
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Problems solved by technology

[0002] High-frequency radar signals are one of the development trends of modern radars. However, the high-frequency chirped pulse signals generated based on electronic methods are low in frequency and narrow in bandwidth, which cannot meet the needs of high-frequency and high-precision ranging in modern radars.
In the generation of high-frequency chirped pulse signals based on photonics methods, due to the poor tunability of the generated chirped pulse signals, they cannot meet the needs of electronic countermeasures and reduce the anti-jamming ability of the radar system
This seriously hinders the development of radar systems to high frequency and high precision

Method used

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  • Reconstructible high-frequency chirped pulse signal generating device and method
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  • Reconstructible high-frequency chirped pulse signal generating device and method

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Embodiment Construction

[0021] The present invention will be further described below in conjunction with the accompanying drawings.

[0022] Depend on figure 1 A reconfigurable high-frequency chirped pulse signal generating device is shown, including a femtosecond laser 1, a spectrum shaping part, a frequency-time mapping part, and a photodetector 4. The femtosecond laser 1 passes through an optical fiber and a three-port circulator a2, three-port circulator b3, and photodetector 4 are connected in series in sequence, and the three-spectrum shaping part is composed of an optical coupler 5, an adjustable delay line 6, a linearly chirped fiber Bragg grating 7, and an optical fiber ring formed by optical fibers in series, Wherein the optical coupler 5 is connected to the three-port circulator a2, and the frequency-time mapping part includes a spatial light modulator 8 and a reconfigurable chirped Bragg grating 9, wherein the spatial light modulator 8 is connected to a computer 10 with a circuit, which c...

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Abstract

The invention relates to a reconstructible high-frequency chirped pulse signal generating device and method, and mainly aims at solving the problems that high-frequency chirped pulses generated in a present method cannot satisfy high frequency and high-precision range finding requirements for a modern radar. A femto second pulse signal generated by a femto second laser (1) is input to a fiber loop including a linear chirp fiber Bragg grating (7) and an adjustable delay line (6) via a three-port circulator a (2) for spectrum shaping, the optical pulse signal after spectrum shaping is input to a reconstructible chirp Bragg grating (9) via a three-end circulator b (3) for frequency-time mapping, an optical high-frequency chirped pulse signal, and a photoelectric detector (4) converts the optical high-frequency chirped pulse signal into an electrical high-frequency chirped pulse signal. Reconstructible frequency-time mapping is realized, the reconstructible high-frequency chirped pulse signal is realized, and the requirement of high bandwidth can be satisfied at the same time.

Description

technical field [0001] The invention relates to the fields of radar and electronic countermeasures, and relates to a reconfigurable high-frequency chirp pulse signal generating device and a signal generating method for high-frequency radar and high-precision distance measurement. Background technique [0002] High-frequency radar signals are one of the development trends of modern radars. However, the current high-frequency chirped pulse signals based on electronic methods have low frequencies and narrow bandwidths, which cannot meet the needs of modern radars for high-frequency and high-precision ranging. In the generation of high-frequency chirped pulse signals based on photonics methods, due to the poor tunability of the generated chirped pulse signals, they cannot meet the needs of electronic countermeasures and reduce the anti-jamming ability of radar systems. This seriously hinders the development of radar system to high frequency and high precision. Contents of the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S7/282
CPCG01S7/282
Inventor 张勇沈志强曹力赵远董美慧
Owner HARBIN INST OF TECH
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