Air refractive index correction method in large-range absolute distance measurement

摘要: The present invention discloses an air refractive index correction method in large-range absolute distance measurement. is characterized that the self-correction measurement realized based on a two-color of laser single wavelength and synthetic wavelength, two lasers output beam fixed adjustable respectively, chain from large to small constructed via interference system measure to-be-measured distances separately thereby obtain optical estimated values which precisions are improved gradually, wherein each stage satisfies interstage transition condition, smallest can transit wavelength; corresponding be obtained simultaneously, corrected according principle. range high precision, belongs full-path along actual light path, has low precision requirements for environmental parameters, such as temperature, intensity pressure, etc., easy realize.