High-precision optical calibration device and method for large-range distance measurement

Abstract

The invention discloses a high-precision optical calibration device and method for large-range distance measurement, which utilizes lasers, electro-optic modulators, long optical fibers, photodetectors, microwave amplifiers and filters, quartz rods, wavelength division multiplexers and other optical and The electronic device constitutes two OEO resonators including the common loop part, and the two resonators are alternately oscillated through the optical switch; the femtosecond ranging pulse sent by the femtosecond pulse rangefinder enters the calibration optical path for large-range distance measurement, and then After passing through the long optical fiber and a wavelength division multiplexer, it returns to the femtosecond pulse rangefinder through the original path of the lens; the long optical fiber is controlled by the cavity length stabilization controller, that is, the cavity length is controlled by the phase-locked loop to ensure that the photoelectric resonance frequency remains Stable, so as to achieve the purpose of stabilizing the optical path; in addition, use the secondary modulation distance measurement to keep the cavity length stable except for the long fiber; thus, under the condition that the long fiber and other parts of the cavity are stable, the femtosecond pulse Calibration of the rangefinder.

Description

technical field [0001] The invention relates to the field of laser distance measurement, in particular to a large-range, long-distance and high-precision measurement system based on a photoelectric oscillator. Background technique [0002] With the development of space technology such as satellite formation technology, by measuring the distance between satellites to form a high-precision measurement space measurement baseline, the observation accuracy of the earth and deep space can be greatly improved. In applications such as gravitational field measurement, high-precision inter-satellite distance measurement is also required. For this application, large-scale, high-precision inter-satellite distance measurement technology, especially laser distance measurement technology, has developed rapidly in recent years. However, it is difficult to carry out high-precision on-orbit calibration of the measuring load equipment in space, and effective calibration and testing of the ran...

AI Technical Summary

Problems solved by technology

However, it is difficult to carry out high-precision on-orbit calibration of the measuring load equipment in space, and effective calibration and testing of the ranging load on the ground has become an inevitable choice, but due to the large range of inter-satellite ranging ( km to hundreds of km) and ground atmospheric disturbance, vibration and geological interference, it is difficult to achieve the accuracy required for instrument calibration in the ground environment

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