Full-waveform satellite laser ranging system and method

Abstract

The invention belongs to the technical field of laser ranging, and discloses a full-waveform satellite laser ranging system and method. The system comprises: a ground equipment controller which is used for transmitting an instruction; a laser emission module, which is used for emitting laser pulse; a receiving optical system, which is used for receiving echo signals returned by a satellite; a sampling control module, which is used for starting a sampling door controller; an echo detection module, which is used for conducting sampling for multiple times; a signal processing module, which is used for acquiring SLR full-waveform echo data in a time grid arc section; an time analysis module, which is used for performing converting to obtain echo photon flight time for counting and accumulating; a data processing module, which is used for decomposing the acquired multi-peak echo data into a plurality of sub-waveforms; and a ranging module, which is used for acquiring the distance S betweenthe satellite and the ground. The system has direct application value for optimization design of a high-precision SLR system and design of a target recognition algorithm, and further has very important scientific value for perfection of a laser ranging theoretical system.

Description

technical field [0001] The invention belongs to the technical field of laser distance measurement, and in particular relates to a full waveform satellite laser distance measurement system and method. Background technique [0002] Establishing, maintaining and updating a high-precision Earth reference frame is the primary scientific research task of the Global Geodetic Observation System (GGOS). The continuous improvement of the Earth's reference frame not only provides basic data for national defense security, deep space exploration, urban construction, disaster relief and mitigation, but also provides a unified spatial benchmark for scientific research on global changes. Although the current international earth reference frame has reached centimeter-level accuracy, it still cannot meet the urgent needs of global and large-scale geodynamic research for its accuracy, stability, and globalization. Therefore, breaking through and mastering modern space geodetic technology has ...

AI Technical Summary

Problems solved by technology

However, under different observation conditions, the detection signal-to-noise ratio will change significantly with the number of APD array elements

Due to the limitations of the APD array manufacturing process, there is a certain gap between each unit to identify the number of echo photons. The existence of the duty cycle will cause the loss of detection echo energy and affect the detection efficiency of the system.

At the same time, the APD array has extremely high sensitivity, which makes the system more sensitive to noise, and the crosstalk between channels is more serious, which has a negative impact on the detection accuracy of the SLR system.

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