Laser time-of-flight measurement device based on multi-channel time delay estimation and method thereof

A technology for time-of-flight and time-delay estimation, which is used in devices for measuring laser time-of-flight and in the field of laser ranging.

Inactive Publication Date: 2011-09-07
NANJING UNIV OF SCI & TECH
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

However, the acquisition speed of the current digital acquisition unit is limited. If you want to improve t

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  • Laser time-of-flight measurement device based on multi-channel time delay estimation and method thereof
  • Laser time-of-flight measurement device based on multi-channel time delay estimation and method thereof
  • Laser time-of-flight measurement device based on multi-channel time delay estimation and method thereof

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Embodiment Construction

[0023] combine figure 1 , the laser time-of-flight measurement device based on multi-channel delay estimation in the present invention includes two parts: an optical system and an electronic system. The optical system is composed of transmitting optics, receiving optics, first plane mirror 1 and second plane mirror 2; the electronic system is composed of laser transmitter, receiving channel, multi-channel reference channel, digital acquisition unit and mathematical signal processing unit. The optical parameters of the first plane mirror 1 and the second plane mirror 2 are the same, such as a transmittance of 90-98% and a reflectance of 0.5-1%. The first plane mirror 1 is placed in front of the laser transmitter, and its center is 3-5 mm away from the laser transmitter, forming an angle of 45° with the laser transmitter. The second plane mirror 2 is placed in front of the multi-channel reference channel, and its center is 3-5 mm away from the multi-channel reference channel. 3...

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Abstract

The invention discloses a laser time-of-flight measurement device based on multi-channel time delay estimation and a method thereof. The method comprises the following steps: firstly, opening a multi-channel reference channel and a receiving channel immediately when a laser emitter emits a laser beam; secondarily, performing delay-time processing on the signals by the multi-channel reference channel according to a fixed time interval to form multi-channel reference signals; and finally, transmitting the echo signals of the receiving channel and the multi-channel reference signals to a digitalsignal processing unit by a digital collection unit to carry out cross-correlation operation, and correcting the obtained different time delay estimation values by linear polynomial fitting to obtainthe optimal time delay estimation value. The method and the device are completely digitalized; the device is simple; and the method is effective, has small calculation amount and high stability and can effectively improve the measurement accuracy of the laser time-of-flight.

Description

technical field [0001] The invention belongs to the field of laser radar signal processing, in particular to a device and method for measuring laser flight time, which are applied to laser ranging, laser imaging radar and other purposes. Background technique [0002] Laser time-of-flight measurement technology is widely used in laser direct detection applications such as laser ranging and laser imaging radar. The accuracy of laser time-of-flight measurement is directly related to the accuracy of distance measurement and the clarity of distance imaging. [0003] The traditional analog laser time-of-flight measurement is divided into two steps: time discrimination and time interval measurement. Time discrimination is generally to perform simple preprocessing on the laser emission pulse and echo pulse, such as high-pass differentiation, low-pass filtering, etc., and then extract the rising edge of the digital signal at the start and end of the laser through a high-speed compara...

Claims

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Application Information

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IPC IPC(8): G01S7/48G01S7/481
Inventor 陈钱顾国华徐伟
Owner NANJING UNIV OF SCI & TECH
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