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首页> 外文期刊>Applied optics >Four-element receiver for pulsed 10-μm heterodyne Doppler lidar
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Four-element receiver for pulsed 10-μm heterodyne Doppler lidar

机译：四元件接收器，用于10μm脉冲外差多普勒激光雷达

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摘要

A four-element photomixer receiver has been tested in a 10-μm heterodyne Doppler lidar. It addresses a reduction of the variance of the power scattered off distributed aerosols targets at ranges as long as 8 km. An improvement in performance is expected when the four independent signals recorded on every single shot are combined. Two summation techniques of the four signals have been implemented: a coherent summation of signal amplitude and an incoherent summation of intensities. A phasing technique for the four signals is proposed. It is based on a more suitable correlation time with discernible self-consistent packets (SCP's). The SCP technique has been successfully tested, and the results obtained with a coherent summation of the four signals, i.e., variance reduction, carrier-to-noise ratio improvement, and velocity accuracy improvement, are in agreement with theory.
机译：四元素光混合器接收器已经在10μm外差多普勒激光雷达中进行了测试。它解决了在长达8 km的范围内分散的气溶胶目标散发的功率方差减小的问题。将每个单张镜头上记录的四个独立信号进行组合时，可望提高性能。已经实现了四个信号的两种求和技术：信号幅度的相干求和和强度的不相干求和。提出了一种用于四个信号的定相技术。它基于与可识别的自洽数据包（SCP）的更合适的关联时间。 SCP技术已被成功测试，并且通过对四个信号进行相干求和得到的结果，即方差减小，载噪比改善和速度精度改善，与理论相符。

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