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Distance estimation method based on photon counting type laser radar signal reconstruction

A laser radar and distance estimation technology, which is applied in the directions of electromagnetic wave re-radiation, instruments, measuring devices, etc., to achieve the effect of maintaining robustness, reducing the amount of calculation, and improving the solution speed

Inactive Publication Date: 2014-12-10
NANJING UNIV OF SCI & TECH
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Problems solved by technology

[0005] In order to solve the above technical problems, the present invention provides a distance estimation method based on photon counting laser radar signal reconstruction. First, the detection process is modeled, and the problem of how to reconstruct the signal is simplified to solve the problem of noise, echo signal peak position and The problem of the three parameters of the peak amplitude; then, update and estimate the above parameters with the Markov method, any time a certain parameter is updated and other parameters constitute an inference about the echo signal; after that, the estimation is based on Bayesian inference Comparing the output signals, comprehensively considering multiple parameters, so as to complete the signal reconstruction work; finally, use the peak method, mean method or center mean method to process the reconstructed signal and complete the estimation of the relevant distance

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  • Distance estimation method based on photon counting type laser radar signal reconstruction
  • Distance estimation method based on photon counting type laser radar signal reconstruction
  • Distance estimation method based on photon counting type laser radar signal reconstruction

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Embodiment Construction

[0021] Such as figure 1 Shown, a kind of distance estimation method based on photon counting laser radar signal reconstruction of the present invention comprises the following steps:

[0022] Step 1. Input a photon counting laser radar signal y, and specify the parameter to be sought as: t 0 , β, B, where:

[0023] B is the noise signal incident to the laser radar detector, and its value range is: (0, max(y)), max(y) is the maximum value of the laser radar signal (ie full waveform data) y;

[0024] t 0 is the time point corresponding to the peak position of the target echo signal, t 0 The value range of all elements of is: (0,i max ), i max is the length of lidar signal y;

[0025] β is the peak amplitude of the target echo signal, and the value range of all elements of β is: (0,max(y));

[0026] Assign the time point of max(y) to the parameter t 0 , max(y) is assigned to β, 0 is assigned to B, and the initialization of each parameter to be requested is completed; any ...

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Abstract

The invention provides a distance estimation method based on photon counting type laser radar signal reconstruction. The distance estimation method based on the photon counting type laser radar signal reconstruction comprises the steps of: randomly selecting any one of a noise signal B entering a laser radar detector, a peak value position t0 of each echo signal and a peak value amplitude beta of each echo signal for continuous updating operation while each updating operation; updating the parameters above by adopting an Metropolis algorithm thought. The distance estimation method based on the photon counting type laser radar signal reconstruction can reconstruct target signals with unknown characteristics rapidly, and accordingly finish the distance estimation.

Description

technical field [0001] The invention belongs to the technical field of laser radar, and in particular relates to a distance estimation method based on photon counting laser radar signal reconstruction. Background technique [0002] The laser radar system has attracted much attention since its inception. This detection method by actively irradiating the target with laser light can obtain the distance information and three-dimensional features of the target, and is widely used in military and civilian fields. Most lidars measure photon time-of-flight, which indirectly measures distance. On this basis, the photon counting lidar using time-correlated single photon counting (TCSPC) or burst illumination (BIL) technology has obvious advantages in system time resolution and detection accuracy. From the working characteristics of the photon counting lidar system, it can be seen that multiple measurements on the time axis with extremely high resolution will accumulate to form a phot...

Claims

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Application Information

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IPC IPC(8): G01S17/08
CPCG01S17/46G01S7/4802
Inventor 何伟基尹文也方剑陈钱顾国华张闻文林杰叶凌钱惟贤隋修宝任侃路东明于雪莲
Owner NANJING UNIV OF SCI & TECH
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