Design of waveguide optical phased array ladar receiving system
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摘要: 针对光波导相控阵扫描角度大、速度高的特点，设计了光波导相控阵激光雷达的接收系统。该系统采用大视场凝视型的单孔径接收望远镜和APD阵列探测器，进行目标信号的接收转换与目标角度测量；同时采用微透镜阵列（MLA）以弥补APD阵列产生的探测视场空白，提高回波信号能量利用率。首先给出了设计的总体方案，选择并设计了系统的具体参数；针对选择的器件参数，根据激光雷达方程对系统的性能进行了分析。研究结果表明：所设计的接收系统具有体积小、结构紧凑的特点，性能指标可满足相控阵激光雷达的探测需要。Abstract: According to the characteristics of high speed scanning of laser beam of the optical waveguide phased array, a staring single aperture, direct detection of the receiving system was designed with a linear APD array for target detection and target location. Considering the structure characteristics of the linear APD array and the demand of target detection, the micro lens array(MLA)was used to reduce the light loss, improve the receiving signal-to-noise ratio(SNR) in design scheme. Based on the ladar equation and considering of the influence of background noise, the influence of the received angle of view on signal-to-noise ratio was calculated and analyzed, the method of target location(Angle) based on single aperture receiving system with the linear APD array was analyzed. The results showed that increasing the pixel number of an APD array, namely reducing the field of view of the APD pixel, could improve the output SNR of the detection system, and improve the target location accuracy at the same time when the field of view of the optical receiving system is fixed. On this basis, considering of the demand of detection range, signal-to-noise ratio, and target location accuracy, the size of the detector array and the receive field of view are chosen. Finally, the performance of the design receiving system has carried on the comprehensive analysis and calculation, the indicators met the design requirements of the system.
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Key words:
- optical waveguide phased array /
- laser ladar /
- APD arrays /
- signal to noise ratio /
- angle measurement
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