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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 errors and invalid data that cannot be used normally, and achieve low cost, improved effectiveness, and simple effects

Inactive Publication Date: 2014-01-29
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
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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 the m-order filtering process, 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 processing results are stored in the n-order data stack N. After each processing, the stack is pushed once, and then the n-order filtering algorithm is used to process the data stack data N again. The final result is stored in the final in the data stack Z. The present invention is proved to have very good effect through experimental verification.

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

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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 that is actively 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; and other factors may cause the data to have no echo signal or return the wrong echo signal, resulting in invalid elevation data, resulting in the wrong adjustment of the working parameters of the spaceborne optical imaging detection system, and it cannot work normally. Therefore, it is necessary to remove the invalid data. the core problem. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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