Distance measurement method and distance measurement system
A technology of distance and measured target, applied in the circuit field, can solve the problems of complex measurement structure and low precision, and achieve the effect of high precision and simple structure
Inactive Publication Date: 2017-06-27
CRRC QINGDAO SIFANG CO LTD
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[0004] The embodiment of the present invention provides a distance measuring method and a distance measuring system to at least solve the technical problems of complex measurement structure and low precision caused by the direct counting method in the related art
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[0022] In order to enable those skilled in the art to better understand the solutions of the present invention, the following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only It is an embodiment of a part of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present invention.
[0023] It should be noted that the terms "first" and "second" in the description and claims of the present invention and the above drawings are used to distinguish similar objects, but not necessarily used to describe a specific sequence or sequence. It is to be understood that the data so used are interchangeable under appropriate ...
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The invention discloses a distance measurement method and distance measurement system, wherein the method includes the following steps: a pulse laser emits a laser signal; a photodiode APD array receives a return signal which is returned after the laser signal encounters a measured target, and transmits the received return signal to a timing chip; the timing chip determines the flight time of a rail train to the measured target according to the laser signal and the return signal, and transmits the determined flight time to a Programmable Logic Controller (PLC), and the timing chip reaches ns-level measurement accuracy; and the PLC determines distance between the rail train and the measured target according to the received flight time. The distance measurement method provided by the invention solves the technical problems of complicated measurement structure and low accuracy brought by adoption of a direct counting mode in related technologies, improves measurement accuracy, and simplifies the structure.
Description
technical field [0001] The present invention relates to the field of circuits, in particular to a ranging method and a ranging system. Background technique [0002] At present, the distance value of laser ranging imaging is generally determined by measuring the time of laser pulse emission, that is, the time of start and the time of receiving the reflected light pulse of the target, that is, the time of flight of the laser between stop. The measurement accuracy of laser time of flight determines the accuracy of the entire system. Therefore, the accuracy requirements for time-of-flight measurement are very high. The accuracy of time-of-flight measurement is determined by two factors: one is the accuracy of time pulse signal generation; the other is the accuracy of time pulse measurement. Among them, the method of measuring the time pulse usually adopts the direct counting method. This method is to use the crystal oscillator on the circuit board to generate an oscillating cl...
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Login to View More IPC IPC(8): G01S17/10G05B19/05
CPCG01S17/10G05B19/058G05B2219/163
Inventor 梁建英贾步超周海军王大奎王海涛杨盼奎王维峰王晓虎
Owner CRRC QINGDAO SIFANG CO LTD