Noise assessment method for zero-difference observation value of Beidou receiver

Abstract

The invention discloses a noise assessment method for a zero-difference observation value of a Beidou receiver. The noise assessment method comprises the following steps: reading Beidou observation data in an observation document; respectively obtaining Beidou carrier phase observation values and pseudo-range observation values of B1, B2 and B3 three frequencies; based on theoretical analysis, respectively calculating coefficients of three-frequency carrier phase combination and three-frequency pseudo-range combination, and utilizing the corresponding coefficients to form a combined observation value; utilizing the three-frequency carrier phase combination coefficient to perform cycle slip probe and mark on the carrier phase observation values; calculating the noise conditions of the carrier phase observation values and the pseudo-range observation values of the B1, B2 and B3 three frequencies respectively. Compared with the conventional method, the noise assessment method disclosed by the invention only requires the observation data of a single receiver to be processed with simple linear combination, and then independently evaluates the noise of the carrier phase observation values and the pseudo-range observation values of a single satellite, so that the noise assessment method can evaluate the noise of the original observation values of the Beidou receiver more simply and objectively.

Description

technical field [0001] The invention relates to a method for evaluating the noise of the non-difference observation value of a Beidou receiver. Background technique [0002] The Beidou regional satellite navigation system independently developed by my country has been officially completed and has begun to provide positioning, navigation, and timing services to the Asia-Pacific region. However, all applications of the Beidou regional navigation system are based on observations generated by receivers, so the quality of observations will depend on Determines the accuracy of each of the above applications. Generally, the zero-baseline experiment is used to evaluate the noise of the Beidou receiver observations by using the carrier phase and pseudo-range observations to form a single difference between stations or a double difference between stations and satellites. The use of zero baseline to analyze the noise of Beidou receiver observations requires two receivers to share one a...

AI Technical Summary

Problems solved by technology

The use of zero baseline to analyze the noise of Beidou receiver observations requires two receivers to share one antenna for observation, and the quality of the observations of the same type of receivers may also have certain differences. The carrier phase and pseudorange observations of the two receivers constitute The single and double difference method does not directly evaluate the noise level of the observation value of a single receiver, but only reflects the noise of the observation value of the receiver from the side.

In addition, the zero-baseline single-difference or double-difference method completely eliminates the noise at the antenna end and cannot accurately reflect the noise level of the actual observation value

For the evaluation of the noise of single-receiver observation data, some scholars conduct geometric-free combination based on the dual-frequency carrier phase observations of a single receiver, and analyze the noise of carrier phase observations by filtering, but this combination does not completely eliminate the influence of ionospheric errors , and the filtering process is more complex

For the evaluation of receiver pseudo-range observation noise, the combination of carrier phase and pseudo-range is generally used to calculate the multipath effect of pseudo-range observations. This method will not only introduce carrier phase observations, but also increase the trouble of cycle slip detection and repair. Path errors get incorporated into the noise

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