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Doppler velocity measurement method based on bidirectional one-way communication

A laser Doppler and Doppler frequency shift technology is applied in the field of laser Doppler speed measurement based on two-way one-way communication, which can solve the problems of increasing difficulty, difficult for detectors to detect echo signals, weak echo signals, etc.

Active Publication Date: 2017-01-04
SHANGHAI INST OF OPTICS & FINE MECHANICS CHINESE ACAD OF SCI
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Problems solved by technology

[0004] Prior art [Zhang Yanyan, Gong Ke, etc., Laser Doppler Velocimetry Technology Progress [J]. Laser and Infrared, 2011, 40(11): 1157-06. The echo signal of the laser and the local reference optical signal of the laser make a difference frequency. When the laser is transmitted over a long distance, the echo signal of the laser will be very weak, and it is difficult for the detector to detect the echo signal. Therefore, a high-power laser and a high-power sensitivity of the photodetector, which increases the difficulty of implementing

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  • Doppler velocity measurement method based on bidirectional one-way communication
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  • Doppler velocity measurement method based on bidirectional one-way communication

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[0028] The present invention will be described in further detail below in conjunction with the accompanying drawings and examples, but the protection scope of the present invention should not be limited thereto.

[0029] figure 1 It is a functional block diagram of the present invention, and its specific implementation includes the following steps:

[0030] Step 1: Transmit the signals of A and B to each other at the same time, and the signal frequency of A is f A , the signal frequency of B ground is f A .

[0031] Step 2: After t 0 After time, A receives a signal from B with frequency f AR , make difference frequency between the local signal of A ground and the received signal of A ground, the frequency of the signal after frequency difference can be obtained as f AR -f A ; Simultaneously B land receives the signal from A land, its frequency is f AR , make difference frequency between the local signal of B and the received signal of B, and the frequency of the signal ...

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Abstract

The invention relates to a Doppler velocity measurement method based on bidirectional one-way communication. A bidirectional one-way communication is used between two places. Two lasers at the two places send signals at the same time and detect and receive the signals at the same time. Doppler shift can be obtained by adding and then averaging the frequencies of the signals received at the two places. Then relative speed of the two places can be obtained by a relation between Doppler shift and speed. The method adopts a bidirectional one-way communication approach, and can achieve longer transmission distance under the same transmitting power compared with a traditional velocity measurement method.

Description

technical field [0001] The invention relates to the fields of free-space laser communication and laser velocity measurement, more specifically, a laser Doppler velocity measurement method based on two-way one-way communication. [0002] technical background [0003] In 1964, Yang (YEN) and Cumnis (Cumnis) first measured the distribution of water laminar flow by using laser Doppler frequency shift, which opened the prelude to the development of laser Doppler velocimetry technology. Laser Doppler velocimetry (LDV) uses a photodetector to detect the frequency shift between the scattered light or reflected light on the surface of an object and the reference light to obtain the speed information of the object. Compared with traditional contact measurement, LDV is a non-contact measurement, which is a non-interference flow field measurement technology with extremely high measurement accuracy. In principle, the LDV response has no hysteresis and can keep up with the rapid pulsation...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S17/58H04B10/112
CPCG01S17/58H04B10/1123
Inventor 孙建锋许蒙蒙张波蔡光宇张国李光远贺红雨劳陈哲陈卫标刘立人
Owner SHANGHAI INST OF OPTICS & FINE MECHANICS CHINESE ACAD OF SCI
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