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Intelligent data acquisition method and system used for space-based laser altimetry

A data acquisition system and data acquisition technology, applied in the field of remote sensing detection, can solve problems such as difficulties in real-time implementation, and achieve the effects of small size, compact system structure, and stable and reliable circuits

Inactive Publication Date: 2009-12-30
WUHAN UNIV
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  • Claims
  • Application Information

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Problems solved by technology

When the sampling rate is higher than 100M SPS, the higher the sampling rate, the more difficult it is to realize real-time

Method used

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  • Intelligent data acquisition method and system used for space-based laser altimetry
  • Intelligent data acquisition method and system used for space-based laser altimetry
  • Intelligent data acquisition method and system used for space-based laser altimetry

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Embodiment Construction

[0042] Below in conjunction with accompanying drawing, the present invention will be further described with specific embodiment:

[0043] The intelligent data acquisition method for space-based laser altimetry provided by the present invention adopts the following steps:

[0044] ①Send acquisition parameters and clock setting requirements to the main control computer, the main control computer responds to the request through the USB interface, transmits the acquisition parameters and system time, and sets the acquisition parameters and local clock of the data acquisition system;

[0045] In this step, the acquisition parameters include the transmitted wave threshold, the echo threshold, the number of bytes collected before and after the transmitted wave threshold, the number of bytes collected before and after the echo threshold, the number of bytes collected before and after the echo threshold, the echo threshold Wave screening start time, continuous working time, etc.

[00...

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Abstract

The invention relates to an intelligent data acquisition method and a system used for space-based laser altimetry. The intelligent data acquisition method of the invention can control and conduct abnormal handling on the data acquisition process, complete accurate and synchronous dual-channel high-speed data acquisition and realize real-time high-capacity intelligent data storage. The intelligent data acquisition system of the invention mainly comprises a signal conditioning unit, a signal transfer switch, an analog-to-digital conversion unit, a data cache unit and a data and control unit; wherein, the dual channels respectively receive emission waves and echoes of a laser altimeter. The invention is characterized by compact system structure, small volume, stable and reliable circuit, large detected dynamic range, little analog-to-digital conversion error, high accuracy and robustness, capability of stably working for a long time without a break, capability of acquiring, transferring and storing all the useful data in real time, capability of adding the radar detection function to the space-based laser altimeter and capability of obtaining surface elevation distribution within the range of light spots and reflectivity.

Description

technical field [0001] The invention relates to the technical field of remote sensing detection, in particular to an intelligent data acquisition method and system for space-based laser altimetry. Background technique [0002] Space-based remote sensing detection technology is an important technology in the field of earth sciences. Space-based laser altimetry is to use satellites to carry laser altimeters to detect the contours of the planet's surface from space. The working principle of space-based laser altimetry is that the space-based laser continuously emits laser light to the ground. The laser beam passes through the atmosphere and reaches the ground to generate a weak backscattered echo. The scattered echo passes through the telescope in the altimetry system of the atmosphere again. Received; the laser echo is converted into an electric pulse echo by a photodetector, and the transit time of the laser pulse is obtained by analyzing the transit time TOF (time of flight)...

Claims

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Application Information

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IPC IPC(8): G01S7/483G01S17/08
Inventor 易帆黄春明余长明张云鹏张绍东岳显昌何裕金
Owner WUHAN UNIV
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