Signal processing system architecture applied to airborne laser radar
An airborne lidar and signal processing technology, used in radio wave measurement systems, measurement devices, instruments, etc.
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[0026] In the present invention, in order to obtain the waveform accurately, the airborne laser radar selects a laser with a narrower pulse width, so a photomultiplier tube (PMT) with extremely high sensitivity, extremely low noise and extremely fast response speed is selected as the detection device for 532nm laser detection. The device can meet the system requirements. The PMT detector has a dynamic range of 10 3 ~10 4 , for the laser echo signal 10 6 ~10 7 Considering the design cost comprehensively, two PMT detectors are selected to splice and measure the echo signals by coordinating with the optical attenuation sheet. That is, shallow sea PMT detectors are responsible for 1-10 4 The detection work of the dynamic range, that is, the deep-sea PMT detector is responsible for 10 3 ~10 7 Dynamic range detection works.
[0027] For full waveform analysis, a high-speed analog-to-digital converter (ADC) is selected to sample the waveform. The speed of the laser in water i...
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