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Radar sensor double-antenna structure

A radar sensor and dual-antenna technology, which is applied in the field of radar sensors, can solve problems such as large fluctuations in speed measurement, influence of installation angles, and poor acceleration response, and achieve the effects of improving instantaneous response, solving speed fluctuations, and improving instantaneous response

Inactive Publication Date: 2015-12-16
上海道麒实业发展有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This will cause the radar to detect the speed of multiple transmitting targets within the beam range
[0005] 2. The road environment is changeable
[0006] 3. The vibration of the locomotive itself
[0008] 5. Installation angle influence
[0009] 6. Insufficient instantaneous response of acceleration
[0011] 1. The speed measurement fluctuates greatly
[0012] 2. There will be a sudden change in speed
[0013] 3. Poor road adaptability
[0014] 4. Big error
[0015] 5. The acceleration response becomes poor, causing the traction or braking control system of the locomotive to report an error
[0016] 6. The installation is more complicated

Method used

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  • Radar sensor double-antenna structure

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] like figure 2 As shown, in a high-speed motion environment, the horizontal angle of Antenna 1-3 should be as small as possible, and the angle θ should be based on the space of different structural shells and the installation conditions of the equipment used. 1 If it is 20-40 degrees, good performance will be obtained, and the angle should be increased as much as possible if the space permits; the horizontal angle θ of antenna 2 1 2 for θ 1 +5 degrees ~ θ 1 +15 degrees; when the above constraints are met, the lateral distance between the feeding points of the two antennas should be minimized, which is the best.

Embodiment 2

[0042] like figure 2 As shown, in some installation methods with limited volume, it is necessary to further compress the overall casing of the speed measuring radar equipment, so it is necessary to use this method for antenna installation. At this time, the value of the horizontal angle θ1 of antenna one 3 is between 20 and 40 degrees; the horizontal angle θ of antenna two 1 2 Take the value at θ 1 +5 degrees ~ θ 1 Between +15 degrees, in the case of extremely limited space, the surface area of ​​antenna two blocking antenna one shall not exceed 5mm in the direction perpendicular to the surface of antenna one.

[0043] The observed values ​​of the two radars on the antenna one 3 and the antenna two 1 are respectively:

[0044] v 1 =vcosθ 1

[0045] v 2 - v cos ( ...

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Abstract

The invention discloses a radar sensor double-antenna structure, and the structure comprises a support, a first antenna, a second antenna, and a radar housing. The first and second antennas are connected with the support, and the top of the first antenna is connected with the bottom of the second antenna. The support is connected with the radar housing. An inclined angle between the first antenna and a horizontal plane is (90-theta 1) degrees, and an inclined angle between the second antenna and the horizontal plane is (90-theta 2) degrees. The structure is simple, is convenient to install and operate, does not need to carry out angle correction, and avoids the impact from angle errors.

Description

technical field [0001] The invention relates to the technical field of radar sensors, in particular to a dual-antenna structure of a radar sensor. Background technique [0002] Radar speed measurement is based on the Doppler effect of electromagnetic waves. The so-called Doppler effect refers to the phenomenon that the frequency of sound waves and electromagnetic waves changes due to the relative movement between the transmitter and the receiver. This frequency change is called Doppler frequency shift, which is proportional to the relative speed and is proportional to The wavelength of the wave is inversely proportional. [0003] Single antenna will encounter the following problems in the application environment of railway locomotive speed measurement radar: [0004] 1. There are many and complex reflection targets. In the railway track environment, the track, turnout, track equipment, sleepers, track fasteners, ballast and gravel are all reflection targets, and the refle...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01Q1/22H01Q21/28
Inventor 李春勇
Owner 上海道麒实业发展有限公司