Distance measuring method and distance measuring device
A distance measuring method and technology of a distance measuring device, which are applied in the field of wireless distance measurement, can solve the problems of low transmission wave frequency, cannot achieve high measurement range and high precision at the same time, and reduce measurement precision, and achieve high precision, taking into account the measurement range and The effect of measurement accuracy
Active Publication Date: 2019-08-06
艾普柯微电子(江苏)有限公司
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Therefore, if you want a larger measurement range, you need a lower frequency of the transmitted wave, but the measurement accuracy will be reduced
Therefore, if you need to measure the precise distance of an object whose distance is about 14 meters, theoretically you can only use f=10MHz transmitting wave, but the accuracy error is 4mm. If you want to reduce the measurement error to 1mm, it is impossible to achieve
That is, it is impossible to achieve high measurement range and high precision at the same time in related technologies
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[0051]Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, the same numerals in different drawings refer to the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present application. Rather, they are merely examples of apparatuses and methods consistent with aspects of the present application as recited in the appended claims.
[0052] The terminology used in this application is for the purpose of describing particular embodiments only, and is not intended to limit the application. As used in this application and the appended claims, the singular forms "a", "the", and "the" are intended to include the plural forms as well, unless the context clearly dictates otherwise. It should also be understood that the term "...
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The application provides a range measuring method and a range measuring apparatus. According to the application, the method includes the following steps: transmitting a first optical signal and a second optical signal to a to-be-measured object, and receiving a first reflected signal and a second reflected signal; the first optical signal having a frequency smaller than that of the second optical signal; the first reflected signal and the second reflected signal being signals respectively reflected by the to-be-measured object; based on the first optical signal and the second optical signal, obtaining a first phase difference, and based on the second optical signal and the second reflected signal, obtaining a second phase difference; based on the first phase difference, obtaining a first range; based on the first range and the measuring span corresponding to the second optical signal, obtaining a third phase difference; the third phase difference being the missing phase difference of the second optical signal and the second reflected signal; based on the sum of the second phase difference and the third phase difference, making a second range which serves as the result of the range measurement of the to-be-measured object. According to the application, the method can ensure measuring span and measuring precision at the same time.
Description
technical field [0001] The present application relates to the technical field of wireless ranging, and in particular to a ranging method and a ranging device. Background technique [0002] In the related art, the TOF (Time of Flight, time of flight) distance sensor based on phase detection calculates The distance between the distance sensor and the measured object. If the phase difference is less than one period, that is, when the phase difference is between 0 and 2π, the distance can be calculated according to the phase difference where c is the speed of light, f is the frequency of the emitted sine wave, is the phase difference. [0003] If f is 40MHz (megahertz), the measurement range is between 0-3.75 meters, and the measurement accuracy is 1mm; if f is 20MHz, the measurement range is between 0-7.5 meters, and the measurement accuracy is 2mm; if f is 10MHz, Then the measurement range is between 0-15 meters, and the measurement accuracy is 4mm. It can be conclude...
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IPC IPC(8): G01S17/08
CPCG01S17/08
Inventor 东尚清李碧洲
Owner 艾普柯微电子(江苏)有限公司