Electro-optic modulation based microwave photon composite modulation synthesis of extremely narrow pulse generation system
An electro-optic modulation and microwave signal technology, applied in electromagnetic wave transmission systems, transmission systems, electrical components, etc., can solve the problems of generating large-bandwidth arbitrary modulation signals, difficulty in realizing high-purity signals, and many spurious output signals. Structure, high frequency, wide bandwidth effect
Active Publication Date: 2021-07-20
BEIJING INSTITUTE OF TECHNOLOGYGY
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Problems solved by technology
However, due to the nonlinearity of digital circuits, the output signal has many spurs, and it is usually difficult to achieve high-purity signal generation. In addition, the memory required to store large-bandwidth waveform data has exceeded the storage capacity of current mainstream FPGA chips.
Therefore, it is difficult to generate large-bandwidth arbitrary modulation signals in a digital way at this stage
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[0024] A broadband arbitrary waveform generator based on microwave photons is used to synthesize linear frequency modulation signals, frequency coded signals, frequency-phase composite coded signals, etc., and mainly includes a frequency modulation part, a phase locking part and a phase modulation part. in:
[0025] The frequency modulation part is completed by the photoelectric oscillator module. The phase modulator 3, the Add-Drop microdisk resonator optical filter 4, the fiber delay line 5, the photodetector 6, the microwave coupler 7, the microwave power amplifier 8 and the bias device 9 are connected in sequence, and the bias device 9 outputs Access to the phase modulator 3 forms a closed loop; the closed loop constitutes the main structure of the photoelectric oscillator in this embodiment; one output of the microwave coupler 7 is connected to the phase locking part; Add-Drop type microdisk resonator optical filter 4 One of the outputs is connected to the phase modulati...
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The invention discloses a broadband microwave frequency-phase complex modulation signal generation system based on electro-optic modulation, which utilizes a frequency-electrically adjustable microdisk optical filter in a photoelectric oscillation module to select the frequency of an oscillating signal to realize frequency modulation; and utilizes a phase modulation module The CEC optical phase modulator performs arbitrary phase encoding; the phase-locked loop module is used to phase-lock the generated signal to ensure the coherence of the radar working waveform; the signal generator can generate linear frequency modulation signals, frequency encoded signals, and frequency-phase composite encoded signals , flexible and changeable waveforms can meet the needs of target detection in various complex scenarios; compared with traditional electronic technology, the use of optical technology to generate microwave broadband signals has significant advantages such as high frequency, large bandwidth, and easy waveform reconstruction.
Description
technical field [0001] The invention relates to the technical field of microwave signal generating devices, in particular to a broadband microwave frequency-phase composite modulation signal generation system based on electro-optical modulation. Background technique [0002] Modern radars need to have the characteristics of low interception and anti-jamming. Radars with low probability of interception often use signal forms such as frequency encoding, phase encoding, and noise modulation. Several signals have their own advantages and disadvantages. Phase-encoded signals have waveform agility, anti-interference and low interception capabilities, but are sensitive to Doppler frequency shift. The frequency coded signal can achieve larger bandwidth and higher peak side lobe ratio, but the general modulation law is relatively simple. Under the current technical conditions, it is difficult to achieve a large time-width-bandwidth product with a single phase or frequency encoding, ...
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IPC IPC(8): H04B10/50H04B10/516H04B10/548
CPCH04B10/503H04B10/516H04B10/548
Inventor 张伟锋梁振楠刘泉华龙腾
Owner BEIJING INSTITUTE OF TECHNOLOGYGY