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Distance measuring method, device and system thereof

A distance measurement method and a technology of a distance measurement system, which are applied in measuring devices, radio wave measurement systems, radio wave reflection/reradiation, etc., can solve problems such as difficulty in accurate phase measurement, high cost, and complex signal processing circuits, and achieve The effect of wide measurement range and high precision

Pending Publication Date: 2019-03-08
上海频语电子技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, most of the phase measurement units have high requirements on the circuit, which makes it difficult to accurately measure the phase, or the subsequent signal processing circuit used is complicated, resulting in high cost

Method used

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  • Distance measuring method, device and system thereof
  • Distance measuring method, device and system thereof
  • Distance measuring method, device and system thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0058] figure 1 , 2 Shown, a kind of ranging method, this method ranges by mixer, comprises steps:

[0059] S1. Divide the same radio frequency signal into two signals with the same frequency and different phases;

[0060] S2. The LO end of the mixer receives one of the signals, and the RF end receives the reflected signal of the other signal at the measured distance;

[0061] S3. Calculate the measured distance according to the phase difference and frequency of the input signals at the LO end and the RF end as a data basis.

[0062] In the present invention, the same radio frequency signal is divided into two channels of signals with the same frequency and different phases. One channel directly enters the LO terminal of the IQ mixer, and the other channel is transmitted through the transmitting antenna. After passing through the measured distance, the received reflected signal enters the mixer. At the RF end, according to the working principle of the IQ mixer, the phase re...

Embodiment 2

[0078] At any frequency, the phase difference corresponds to the distance, which is a linear relationship; but the signal waveform cycle is 360°, and the phase is 360° as a cycle, which will make, for example, a 5° phase and a 365° phase in the actual test. It is displayed as 5°, which creates ambiguity, that is, the distance corresponding to 5° and the distance corresponding to 365° have the same calculation result; therefore, when calculating the distance, the longest distance can only be measured at one wavelength, otherwise phase ambiguity will occur , the applications are very limited.

[0079] In the above-mentioned embodiment 1, for a 20GHz signal, the longest distance can only be measured by one wavelength, that is, 0.015 meters; if a longer distance measurement function is to be realized, a signal with a longer wavelength needs to be selected for fuzzy calculation and analysis.

[0080] Therefore, due to the limitation of the phase accuracy, the present invention need...

Embodiment 3

[0106] In the second aspect, the present invention also provides a distance measuring device, such as image 3 As shown, it includes a power divider, a mixer and a data processing unit; the power divider is used to receive the radio frequency signal and divide it into two signals with the same frequency and different phases; one path directly enters the LO end of the IQ mixer, and the other path Transmitted through the transmitting antenna to reflect back after passing through the measured distance;

[0107] In the mixer, its LO end receives one of the signals, and the RF end receives the reflected signal of the other signal on the measured distance;

[0108] A data processing unit, configured to calculate the measured distance according to the phase difference and frequency of the input signals at the LO end and the RF end.

[0109] The device is used to implement the distance measuring method of the present invention, uses the IQ mixer to obtain the phase difference signal ...

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Abstract

The invention discloses a distance measuring method. The method measures a distance by a mixer, and comprises the steps of dividing the same radio frequency signal function into two signals of different phases and different phases; receiving one of the signals by a LO end of the mixer, and using a RF end to receive the reflected signal of the other signal at a measured distance; calculating the measured distance according to the phase difference and the frequency of the input signal of the LO end and the RF end. The method utilizes the device characteristics of the mixer, converts the signalsinto phase difference data, performs distance measurement, and has high precision and wide measurement range; the invention also provides a distance measuring device and system, a pair of antennas (atransmitting antenna and a receiving antenna) are only needed to achieve high-precision ranging, there is no special requirements on the signal form (continuous wave and pulses), and the system and device are conducive to the achievement of high-precision calculation of measurement parameters.

Description

technical field [0001] The present invention relates to the technical field of microwave ranging, in particular to a measuring method, device and system thereof. Background technique [0002] Laser or microwave ranging is more and more widely used. Due to its advantages of high measurement accuracy, fast response, and good orientation, it is often used in military microwave radar ranging, traffic microwave radar speed and ranging, navigation positioning, terrain measurement etc. [0003] According to different measurement environments and measurement fields, there are mainly four types of ranging methods: interferometry, feedback method, pulse method, and phase method. [0004] The interferometry uses the principle of interference. Two parallel signals are converted into distances by measuring the phase difference at a fixed angle and spacing. To obtain high measurement accuracy, a large spacing is required; the feedback method uses the feedback principle to make the oscill...

Claims

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Application Information

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IPC IPC(8): G01S13/08
CPCG01S13/08
Inventor 刘昆王晓平宋波
Owner 上海频语电子技术有限公司
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