Tight combination method for calculating pseudo range/pseudo range rate by using Doppler velocimeter

Abstract

The invention discloses a tight combination method for calculating a pseudo range/pseudo range rate by using a Doppler velocimeter. The method comprises: step 1, installing a strapdown inertial navigation system, a laser Doppler velocimeter, and a Beidou satellite navigation system at a moving carrier, and electrifying the combined navigation system for starting up; step two, carrying out initial position parameter binding; step three, keeping the moving carrier to be still for five minutes, carrying out initial alignment to obtain an initial attitude angle; step four, starting a tight combination mode and starting the moving carrier; and step five, carrying out calculation to obtain a pseudo range value and a pseudo range rate value, and carrying out tight combination navigation by using differences between the pseudo range value and pseudo range rate value and pseudo range and pseudo range rate values outputted by a Beidou satellite navigation system as observation values of the combined navigation system. According to the invention, tight combination with the Beidou satellite navigation system is carried out by using the pseudo range value and pseudo range rate value calcualtd by the laser Doppler velocimeter and function complementation is realized; and the pseudo range value and pseudo range rate value of the moving carrier are deduced based on the location of the moving carrier and the Beidou satellite, so that high-precision navigation is realized.

Description

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AI Technical Summary

Benefits of technology

This technology allows for precise measurement on movement carriers based upon their pseudo distance from an orbiting reference point called LOS (Line Of Sight). By combining this data with both GNSS signals or other navigational systems like GLONASS, it becomes possible to achieve very accurate location tracking over large areas without any external references such as ground markers.

Problems solved by technology

This patented technology allows for accurate measurements on vehicles at different speeds while avoiding any issues that may affect their navigational capabilities during interruptions or collisions between them.

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