Distance measurement method and device based on orthogonal locking of microwave photon signals

Abstract

The invention discloses a distance measurement method and a distance measurement device based on orthogonal locking of microwave photon signals. The conventional phase-type laser distance measurement and phase discrimination circuit is complex and high in cost. The distance measurement method disclosed by the invention comprises the following steps of: dividing a radio-frequency signal generated by a swept-frequency signal generator into two paths via a power divider, conveying one path to a Mach-Zehnder intensity modulator, and conveying the other path to a local oscillator port of a frequency mixer; conveying the output of a laser to a first port of a three-port circulator after passing through the Mach-Zehnder intensity modulator, and then conveying to an optical fibre collimator via a second port to be emitted; returning an optical signal reflected by a target to the three-port circulator after passing through the optical fibre collimator, outputting the optical signal to an optical amplifier via a third port, amplifying the optical signal and then conveying the optical signal in a photoelectric detector, conveying the detected radio-frequency signal to a radio-frequency port of the frequency mixer, connecting a mid-frequency port of the frequency mixer with a low-pass filter, and conveying the signal to a computer after filtering; and measuring a frequency differences among orthogonal locking points by a plurality of times to obtain a measured distance. The distance measurement method and the distance measurement device disclosed by the invention inherit the advantages of phase-type laser distance measurement, and can realize high-accuracy middle-short distance measurement with millimetre-level accuracy.

Description

technical field [0001] The invention relates to the field of phase laser ranging, which is based on the transmission of light-borne microwave signals in the air and uses light intensity to control the phase delay so as to realize the measurement of space distance, especially relates to an orthogonal locking based on microwave photon signals Distance measuring method and device. Background technique [0002] Laser ranging is a high-precision distance measurement technology developed with the development of science and technology, especially laser technology, which involves various technologies such as optics, laser, optoelectronics and integrated electronics. Because the laser has good monochromaticity, high angular resolution, and strong anti-interference ability, compared with other ranging technologies, laser ranging can avoid the multipath effect of microwaves close to the ground and the interference of ground objects. It is widely used in military and civilian fields du...

AI Technical Summary

Problems solved by technology

At present, there are many methods used in the phase measurement unit, which can be divided into two categories: analog phase measurement method and digital phase measurement method. In order to achieve higher phase measurement accuracy, the traditional analog phase measurement method often chooses a lower frequency of the basic measurement scale. High, so the circuit requirements are also high, making it difficult to accurately measure the phase

The subsequent signal processing circuit used by digital phase measurement technology is complex, resulting in high cost

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