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Invalid data eliminating method for laser altimeter

A technology of laser altimeter and invalid data, which is applied in the field of optics, can solve problems such as too many invalid data cannot be used normally, errors, etc., and achieve the effects of low cost, improved effectiveness, and convenient expansion

Inactive Publication Date: 2013-02-13
XI'AN INST OF OPTICS & FINE MECHANICS - CHINESE ACAD OF SCI
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Problems solved by technology

[0003] In order to solve the technical problem in the background technology that when the laser measured data is used in real time on the track, there are so many invalid data that it cannot be used normally or causes a large error when used. Thorough and highly automatic laser altimeter invalid data elimination method

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  • Invalid data eliminating method for laser altimeter
  • Invalid data eliminating method for laser altimeter

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Embodiment Construction

[0019] see figure 1 as well as figure 2 , the data format of the laser altimeter is usually stored as a data packet, and each data packet contains m (m=1, 2, 3, 4, ...) data. The elimination of invalid data is divided into two stages: the first stage is m-order filtering processing, including threshold processing of absolute threshold and relative threshold, and the second stage is n-order (n=3, 5, 7, ...) filtering Data processing, only relative threshold processing. After the first stage is processed, the processed result is stored in the n-order data stack N. After each processing, the stack is pressed once, and then the n-order filtering algorithm is used to process the data stack data N again, and the final result is stored in the final the data stack Z. The present invention has been proved to have good effects through experimental verification.

[0020] The principle of the present invention is to use a software filtering algorithm to filter out invalid data, the c...

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Abstract

The invention discloses an invalid data eliminating method for a laser altimeter. The method comprises the following steps of: setting an absolute threshold, a relative threshold and a default value of data validity; reading a data packet of the laser altimeter, performing data correction by applying calibration data and storing the corrected data into a data group Mm; eliminating the invalid data which exceed the absolute threshold from the data group Mm; if valid data do not exist, using the default value; if the valid data exist, obtaining a k metadata group Mk; judging a k value, and outputting different results; and setting an initial state of a stack tail of a data stack Nn to be a system default value. The invention provides the invalid data eliminating method for the laser altimeter. By the method, the data validity can be improved greatly; the invalid data can be eliminated thoroughly; and the automatic processing degree is high.

Description

technical field [0001] The invention belongs to the field of optics, and relates to a method for eliminating invalid data of a laser altimeter, in particular to a method for eliminating invalid data in the process of real-time elevation measurement of spaceborne laser altimeter data. Background technique [0002] The laser altimeter uses the return wave of the laser emitted by itself to detect and determine the absolute distance between the target and the platform, which can provide real-time relative height data for the adjustment of the working parameters of the optical imaging detection system on the same platform; however, due to the fluctuation of the target surface and the interference of stray light and other factors, which may cause the data to have no echo signals and return wrong echo signals, resulting in invalid elevation data, resulting in incorrect adjustment of the working parameters of the spaceborne optical imaging detection system, and it cannot work normall...

Claims

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Application Information

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IPC IPC(8): G01S7/48G01S17/08G01C5/00
Inventor 解培月薛彬杨建峰赵葆常马小龙乔卫东
Owner XI'AN INST OF OPTICS & FINE MECHANICS - CHINESE ACAD OF SCI
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