Miniature unmanned plane RTK relative positioning method based on difference air pressure height constraints

Abstract

Provided is a miniature unmanned plane RTK relative positioning method based on difference air pressure height constraints, comprising: installing GNSS receivers of a same model, antennas, barometric leveling sensors and radio stations both on a reference station and a mobile station; transmitting the GNSS original observed value of the mobile station to the reference station, and performing difference recursion treatment on the original observed value of the reference station; employing an LAMBDA algorithm to determine N baseline vector residence values, respectively calculating the difference vector with a baseline vector floating point solution, and performing ordering again according to the absolute value sum of north and east components; transmitting the barometric height of the mobile station to the reference station through the radio stations, and performing difference with the barometric height of the reference station to obtain a difference height; and successively examining the sky direction component of a baseline vector fixed solution, and determining a relative position if meeting difference height constrains. The miniature unmanned plane RTK relative positioning method can utilize the difference height information of the reference station and the mobile station to discriminate a correct baseline vector fixed solution, does not need to use a measurement type receiver with a multi-path inhibition function, and can be used for low cost RTK application.

Description

technical field [0001] The invention relates to an RTK relative positioning method for a small unmanned aerial vehicle based on differential air pressure altitude constraints, and belongs to the technical field of satellite navigation and positioning. Background technique [0002] At present, small UAVs have been widely used in surveying and mapping, aerial photography, monitoring, investigation, communication relay and other fields. The real-time positioning and navigation system is a key system of small UAVs. Since the Global Navigation Satellite System (GNSS) has global, all-weather and continuous precise three-dimensional positioning capabilities, satellite navigation systems represented by GPS and Beidou have been widely used in various fields in the past ten years. The GNSS receiver adopts single-point positioning technology, and the accuracy is generally 3 to 10 meters, but its disadvantage is that it cannot realize sub-centimeter-level high-precision navigation appli...

AI Technical Summary

Problems solved by technology

[0004] However, due to cost and volume constraints, small UAVs are usually equipped with a navigation receiver, but cannot be equipped with a measurement receiver with multipath suppression function, so the multipath error cannot be reduced, which leads to the use of the LAMBDA algorithm to solve the circumferential ambiguity The success rate of the degree is greatly reduced

Once the ambiguity of the whole circle is solved incorrectly, it will lead to a meter-level positioning error, which cannot effectively guarantee the positioning accuracy of RTK

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