Laser radar total wave signal analyzing method

A signal analysis method and lidar technology, applied in the re-radiation of electromagnetic waves, radio wave measurement systems, instruments, etc., can solve the problems of slow operation speed and low transition probability.

Inactive Publication Date: 2014-07-16
NANJING UNIV OF SCI & TECH
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Problems solved by technology

However, the rapid detection of the distribution space by this method mainly depends on the effective preset distribution, and the transition probability of each parameter is usually low, resulting in a slow calculation speed

Method used

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  • Laser radar total wave signal analyzing method
  • Laser radar total wave signal analyzing method
  • Laser radar total wave signal analyzing method

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Experimental program
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Embodiment Construction

[0027] Step 1. Input a laser radar full waveform signal y, and specify the parameter to be requested as: t 0 , k, β, B, where:

[0028] k is the number of echo signals, and its value range is: {0,1,2Kk max},kmax is the maximum value of the preset k, and an appropriate k can be set according to the number of echoes in the target full waveform signal known in advance max value to reduce the amount of calculation;

[0029] B is the noise signal incident to the lidar detector, and its value range is: (0, max(y)), max(y) is the maximum value of the full waveform signal y;

[0030] t 0 is a k-dimensional vector composed of the exact time-of-flight of photons in each echo signal, and its elements correspond to the peak positions of k echo signals, t 0 The value range of all elements of is: (0,i max ), i max is the length of the full waveform signal y;

[0031] β is a k-dimensional vector formed by the peak amplitude of each echo signal, and its elements correspond to the peak ...

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Abstract

The invention provides a laser radar total wave signal analyzing method. According to the method, when updating is carried out every time, one of the parameters including the number k of echo signals, noise signals B incident to a laser radar detector, the peak position t0 of each echo signal and the peak amplitude beta of each echo signal is selected at random so that updating can continue to be carried out; the parameter k is updated based on the Metropolis algorithm thought, the parameter B is updated based on the Metropolis algorithm or the simulation tempering algorithm thought, and the parameter t0 and the parameter beta are respectively updated based on the simulation tempering algorithm thought. According to the laser radar total wave signal analyzing method, total wave signals of targets with unknown characters can be processed quickly without being affected by the signal noise ratio of the total wave signals.

Description

technical field [0001] The invention belongs to the technical field of laser radar, and in particular relates to a laser radar full waveform signal analysis method. Background technique [0002] Traditional lidar can only extract one distance feature in the laser spot, and cannot process the echo signals of multiple distance feature targets in the spot. Using the full-waveform laser radar with the function of completely recording the received signal can obtain the full-waveform signal containing multiple echo signals, which provides the basis for the analysis of the full-waveform signal. The echo signals are co-generated. In order to effectively analyze the distance characteristics contained in a single laser spot imprint, it is necessary to use the full waveform signal analysis technology to extract four key full waveform parameters including the peak position, quantity, peak amplitude, and noise of the echo signal contained therein, which are respectively marked as t 0 ...

Claims

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Application Information

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IPC IPC(8): G01S7/493G06F19/00G01S17/88
CPCG01S7/4802
Inventor 何伟基尹文也王玮陈钱顾国华张闻文钱惟贤隋修宝任侃路东明于雪莲
Owner NANJING UNIV OF SCI & TECH
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