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Full-waveform laser radar data denoising method for satellite laser altimeter

A technology of laser altimeter and laser radar, which is applied in the re-radiation of electromagnetic waves, radio wave measurement systems, and the use of re-radiation, etc., can solve the problems of not being able to remove noise spikes well, and achieve noise removal and low computational complexity.

Active Publication Date: 2016-09-07
SHANGHAI INST OF TECHNICAL PHYSICS - CHINESE ACAD OF SCI
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Problems solved by technology

However, Gaussian filters often smooth out waveform edges and do not do a good job of removing spikes in noise

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  • Full-waveform laser radar data denoising method for satellite laser altimeter
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  • Full-waveform laser radar data denoising method for satellite laser altimeter

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Embodiment Construction

[0015] The embodiments of the present invention are described in further detail below, but the embodiments are not limited to the present invention, and all similar methods and similar changes of the present invention should be included in the protection scope of the present invention.

[0016] (1) Determine the full-waveform lidar data filtering window and polynomial degree variation range. According to the sampling characteristics of full-waveform lidar data (sampling time interval, number of sampling points), determine the filter window size (2M+1) and its variation range (M 1 ≤M≤M 2 , M∈￠), polynomial degree (r) and its variation range (r 1 ≤r≤r 2 , r≤2M+1, ).

[0017] (2) Carry out sliding fitting on the original full-waveform laser data by the least square method, and obtain the convolution coefficient. The convolution coefficient is used to perform convolution calculation on the original full-waveform lidar data, and the SG filter is completed to obtain the denois...

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Abstract

The invention discloses a full-waveform laser radar data denoising method for a satellite laser altimeter, and the method comprises the following steps: (1), determining a full-waveform laser radar data filtering window and a polynomial degree change range; (2), carrying out the sliding fitting of original full-waveform laser data through employing the least square method, solving a convolution coefficient, carrying out the convolution calculation of the original full-waveform laser data through the convolution coefficient, completing the SG filtering, and obtaining denoised original full-waveform laser data; (3), repeatedly carrying out steps (1)-(2), and carrying out the traversal of all possible combinations of the full-waveform laser radar data filtering window and polynomial degrees; (4), extracting an optimal filtering result. The method provided by the invention can effectively remove the noise of the full-waveform laser radar data, is low in calculation complexity, and can effectively maintain the relative maximum and minimum values and pulse width of the original full-waveform laser data.

Description

technical field [0001] The invention relates to the field of earth observation, in particular to a method for denoising satellite laser altimeter full-waveform laser radar data using an SG filter. In particular, it involves a sliding fitting of the original full-waveform lidar data using the principle of least squares, and the denoising result with the smallest sum of squares of differences from the original full-waveform lidar data is used as the final denoising result of the full-waveform lidar data . Background technique [0002] Full waveform lidar data is a waveform data with time as the abscissa and echo intensity as the ordinate. The surface shape of the ground object directly affects the echo waveform of the full waveform lidar. By applying waveform decomposition technology to decompose the full-waveform lidar data, the distance between the surface of the object in the footprint and the sensor can be obtained, and combined with the position of the sensor, the heigh...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S7/487G01S17/08
CPCG01S7/4876G01S17/08
Inventor 黄庚华刘成玉谢锋舒嵘王建宇
Owner SHANGHAI INST OF TECHNICAL PHYSICS - CHINESE ACAD OF SCI
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