Phase encoding laser imaging radar based on microwave photonic signal processing

A laser imaging radar and signal processing technology, which is applied in the field of phase-coded laser imaging radar, can solve the problems of limited signal processor total signal bandwidth, reduced signal processing calculation, and low ranging resolution, so as to avoid high-speed acquisition, The effect of less computation and large signal energy

Active Publication Date: 2015-09-23
ZHEJIANG SCI-TECH UNIV
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Problems solved by technology

[0003] The purpose of the present invention is to solve the problem of low sampling rate of the existing phase-coded laser imaging radar and the limitation of the total signal bandwidth of the signal processor, resulting in low ranging resolution. A phase-coded laser imaging radar based on microwave photon signal processing is proposed to break through Th

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  • Phase encoding laser imaging radar based on microwave photonic signal processing
  • Phase encoding laser imaging radar based on microwave photonic signal processing
  • Phase encoding laser imaging radar based on microwave photonic signal processing

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Embodiment Construction

[0026] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0027] Such as figure 1 As shown, the phase-encoded laser imaging radar based on microwave photon signal processing includes a laser 1, a laser modulation unit 2, an optical antenna 3, a phase-encoded signal generator 4, a pulse signal generator 5, a laser demodulation unit 6, and a signal processor 7 and computer 8; Laser modulation unit 2 comprises modulator 21, first signal source 22 and first memory 23; Optical antenna 3 comprises optical transmitting antenna 31 and optical receiving antenna 32; Laser demodulation unit 6 comprises gate controller 61 , a second signal source 62 , a second memory 63 , an array detector 64 and a demodulator 65 .

[0028] The laser 1 is used to emit a laser signal of constant intensity. The laser emitting end of the laser 1 is connected to the optical input end of the modulator 21 , and the optical output end of the mo...

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Abstract

The invention discloses a phase encoding laser imaging radar based on microwave photonic signal processing. The detection of a phase encoding signal requires rapid signal sampling of a high speed detector. The laser signal sampling speed of an array detector applied to a laser imaging radar is limited by a production process, which cannot meet the signal sampling speed requirement of a large-array phase encoding laser radar. The resolution of phase encoding laser imaging radar ranging is low. According to the invention, an optical device is used; a microwave photonic signal processing method is used to complete the convolution process of an echo signal and a reference signal; the convolution process comprises the product process of the echo signal and the reference signal in a laser modulator/demodulator and the accumulation process of signal product in an accumulation type detector; the limits of the sampling rate of the detector and total signal bandwidth on range resolution is broken; the requirement on the sampling rate of the detector is reduced; and the range resolution and the signal processing rate of a laser radar system are improved.

Description

technical field [0001] The invention belongs to the field of laser radar, and in particular relates to a phase-coded laser imaging radar based on microwave photon signal processing. Background technique [0002] The phase-coded laser radar performs phase modulation on the light wave carrier frequency signal according to the code source, and then transmits the phase-coded laser pulse signal. The laser pulse coded signal reflected by the target is received by the receiver after transmission delay and converted into an echo coded electrical signal by the detector. The phase coded echo signal and the phase coded signal emitted by the laser are sent to the computer through data collection to complete the correlation calculation, and then the signal Processing, and finally give the distance parameter of the target. However, the detection of phase-encoded signals requires high-speed detectors to quickly sample the signals. The sampling speed of laser signal array detectors used in...

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Application Information

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IPC IPC(8): G01S17/89
CPCG01S17/89
Inventor 吴龙杨成华张勇张君张子静杨晓城鲍佳杨旭
Owner ZHEJIANG SCI-TECH UNIV
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