Satellite-borne laser altimeter active spot energy detector and array

Abstract

The invention provides a satellite-borne laser altimeter active spot energy detector and array, applied to capturing laser foot point spots in an array manner. The energy detector comprises a photoelectric detection module, a communication module, a geometrical positioning module, a time synchronization module and a main controller; the photoelectric detection module is used for capturing the energy of the ground foot point spots of a satellite-borne laser altimeter via high-speed and stable photoelectric conversion with an adjustable amplification factor and analog-digital conversion based onhigh-speed threshold comparison; the communication module is used for achieving data and command transmission of the energy detector, to achieve the intelligent data networking of the detector array;the time synchronization module is used for using pulse per second provided by GPS as an input, and combined with a high-precision timer and subsequent time compensation to accurately measure a footpoint spot capturing moment; the geometrical positioning module is used for collaborating GPS single point positioning with an external differential station, and enabling the static single point positioning to reach a sub-meter level in a differential postprocessing manner.

Description

technical field [0001] The invention belongs to the technical field of space-borne laser detection, and relates to an active light spot energy detector and an array of a space-borne laser altimeter. Background technique [0002] Since the pulsed laser emitted by the spaceborne laser altimeter reaches the ground, the spot size is relatively large, and the diameter is generally between 30m and 100m. A single detector cannot capture the energy distribution of the entire spot. At present, there are no substantive products from other domestic units for the ground spot detection of space-borne laser altimeters. In the world, only the US NASA has designed a ground spot detector for the GLAS system, which has only two energy levels and no geometric positioning. , time synchronization and wireless communication and other intelligent management functions. In field operations, hundreds or thousands of detectors are often needed to capture a single spot. The detectors designed and man...

AI Technical Summary

Problems solved by technology

In field operations, hundreds or thousands of detectors are often needed to capture a single spot. The detectors designed and manufactured by NASA without intelligent management are inefficient and require manual positioning, data collection, etc., which may easily cause data miscalculation. , the work efficiency is very low, resulting in distortion of spot capture

The simple ground spot detector designed by NASA has low energy levels and poor positioning accuracy for the center of the spot, so it is difficult to meet the current accuracy requirements

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