Intelligent differential data screening method with reserved specified data size

Abstract

The invention provides an intelligent differential data screening method with a reserved specified data size. The method comprises the following steps: S1, caching all differential data; S2, calculating a signal to noise ratio of each satellite in the differential data and ranking the satellites again in an ascending order based on signal to noise ratios; S3, deleting the satellite with the lowestsignal to noise ratio and checking whether the number of the rest satellites in a satellite system to which the satellite belongs is smaller than a preset satellite number; and if so, deleting the rest satellites in the satellite system; S4, calculating a data size again and comparing the data size with a target data size to determine whether the data size is still larger than the target data size; and if so, repeating the S3; and S5, the rest satellites are grouped and packed and then sending the processed satellites.

Description

technical field [0001] The invention relates to the field of GNSS receiver measurement, in particular to an intelligent differential data screening method for retaining a specified amount of data. Background technique [0002] The amount of differential data from the GNSS board is positively correlated with the number of satellites searched. When the satellite search is good, the amount of data will exceed the limit of some sending devices, resulting in the differential data not being sent normally. The traditional way to limit the amount of differential data is to limit the altitude cut-off angle, but this method has many obvious disadvantages: when the altitude cut-off angle is adjusted to a high value, the satellites for solving will be concentrated in the area above the head, resulting in very low calculation accuracy. Poor; some important satellites with low angles will be deleted, etc. Contents of the invention [0003] The present invention provides an intelligent ...

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Problems solved by technology

[0002] The amount of differential data from the GNSS board is positively correlated with the number of satellite searches. When the search is good, the amount of data will exceed the limit of some sending devices, resulting in the differential data not being sent normally.

The traditional way to limit the amount of differential data is to limit the altitude cut-off angle, but this method has many obvious disadvantages: when the altitude cut-off angle is adjusted to a high value, the satellites for solving will be concentrated in the area above the head, resulting in very low calculation accuracy. Poor; some important satellites with low angles will be deleted, etc.

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