Integer ambiguity granularity changing determination method in single frequency receiving machine absolute positioning

Abstract

The invention discloses a determination method of variable granularity of integer ambiguity of a single-frequency receiver in the absolute positioning, belonging to the technical field of satellite navigation and positioning and relating to a method for carrying out the single-point precise positioning by the single-frequency receiver in a satellite navigation positioning system with the utilization of the satellite carrier phase. The determination method is based on the utilization of the single-point static positioning LAMBDA algorithm to calculate the float solution and the distribution variance of the integer ambiguity, firstly carries out the rough integral mapping of the float solution to complete the roughening of the integral domain of search space, then utilizes the rough integral granularity to change the search region and carries out the search of the integer ambiguity according to search conditions to obtain the integral domain of the integer ambiguity; then the rough integral granularity is continuously reduced, the process is repeated till the rough integral granularity is equal to 1, then the search of the integer ambiguity is completed, and the precise carrier phase integer ambiguity is obtained. The use of the invention can rapidly, conveniently and reliably realize the carrier phase high-precision positioning of the single-frequency receiver and can be applied in the low-cost and high-precision navigation positioning system.

Description

technical field [0001] The invention belongs to the technical field of satellite navigation and positioning, and relates to a single-point precise positioning method for a single-frequency receiver in a satellite navigation and positioning system using satellite carrier phase. Background technique [0002] In the satellite navigation and positioning system, compared with the multi-frequency receiver with high cost, the positioning accuracy of the single-frequency receiver is low, but the price is low, and the civilian market has great potential. The introduction of differential technology enables single-frequency receivers to achieve carrier phase positioning. However, differential technology requires at least two single-frequency receivers or a network for differential signal broadcasting, which increases the cost of investment and makes the operation extremely difficult. cumbersome. [0003] No matter what kind of carrier phase positioning technology is used, the difficul...

AI Technical Summary

Problems solved by technology

However, so far, there are few algorithms for single-frequency receivers used for single-point precise positioning. Generally, the LAMBDA method is transplanted into the single-point static positioning model

However, such a transplantation algorithm is very inefficient in solving the ambiguity of the whole week, and it is difficult to give results in a short time

The reason is: in the single-point static positioning, the observation epoch is short, the satellite operating range is small, and the graphic change in the space combination is small, resulting in a great degree of parameter correlation, which makes the covariance matrix ill-conditioned in the whole-circle ambiguity solution serious, causing the search range to be too large, even through Gaussian integer transformation and sequential search, the correct value cannot be searched in a short time

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