A large dynamic range baseline measurement system and method based on dual optical comb ranging

Abstract

The invention discloses a large dynamic range baseline measuring method based on dual-optical comb ranging. A large dynamic range baseline measuring system based on the dual-optical comb ranging comprises a first femtosecond optical comb GS1, a second femtosecond optical comb GS2, a first spectroscope BS1, a second spectroscope BS2, a third spectroscope BS3, a tracking rotating mirror ZJ, a CCD, areference arm target KJZ, a measuring arm target LJZ, a first photoelectric receiving system, a second photoelectric receiving system, a third photoelectric receiving system, a fourth photoelectric receiving system and a fifth photoelectric receiving system. According to the large dynamic range baseline measuring method based on the dual-optical comb ranging, a dual-optical comb ranging principleand light spot tracking links are introduced into a long baseline system with a certain maneuvering range, and high-precision synchronous measurement of the baseline distance and six degrees of freedom of angles is realized.

Description

Technical field [0001] The invention relates to a large dynamic range baseline measurement system and method based on dual optical comb ranging, which is suitable for antenna ultra-long baseline six degrees of freedom (three distance dimension and three angle dimension) in satellite applications with a certain maneuver range ) Absolute measurement, including single-satellite baseline measurement and inter-satellite baseline measurement. Background technique [0002] In Interferometric Synthetic Aperture Radar (InSAR), the accuracy of baseline measurement is one of the most critical factors affecting the accuracy of satellite elevation measurement. The current InSAR systems under development all have ultra-long baselines. The baseline length between single-satellite antennas ranges from a few meters to several hundred meters, and the baseline length between dual-satellite formation antennas ranges from several hundred meters to several kilometers. In the case of such a long basel...

AI Technical Summary

Problems solved by technology

The laser tracker that appeared in recent years also has the function of absolute distance measurement, but the method of combining IFM (laser interferometry) and ADM (absolute distance meter) is mainly used to achieve absolute distance measurement, and the moving distance is measured by IMF. The absolute distance from the center of the tracking head to the space point can only be obtained by adding the relative distance to the reference distance measured by the ADM. The process is more complicated, and the measurement accuracy and measurement speed need to be improved.

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