Method for measuring Beidou inter-frequency deviation based on parabolic antenna observation

Abstract

The invention provides a method for measuring Beidou inter-frequency deviation based on parabolic antenna observation, and the method comprises the following steps of arranging at least three stationsin the area covered by a Beidou satellite signal, wherein each station is equipped with a parabolic antenna; observing local visible Beidou satellites by polling to obtain prediction orbits during the observation period or estimate the orbits during the observation period by the number of two-row orbits; designing an observation plan by using the orbit data and the coordinates of the stations, wherein the observation plan ensures that each visible satellite has an observation time; and separating the ionospheric delay by using a model to solve the inter-frequency deviation. The method provided by the invention can effectively resist multipath and improve signal to noise ratio, thereby improving the ranging accuracy of the observation of the Beidou satellites, and further improving the accuracy of solving the inter-frequency deviation of the Beidou satellites.

Description

technical field [0001] The invention relates to a method for estimating inter-frequency deviation of navigation satellites. Background technique [0002] The positioning, navigation, and timing services provided by the Global Navigation Satellite System (GNSS) greatly meet people's requirements in life, scientific research, and military affairs. With the continuous improvement of GNSS, the global navigation satellite system presents a multi-frequency development trend. Multi-frequency signals can help improve the fixed speed of ambiguity and have great application prospects. However, since the navigation signal transmission links of each frequency point on the satellite are not exactly the same, there will be a difference between the channel delays between different frequency points, and this difference is called the inter-frequency deviation. The solution of inter-frequency deviation is a key problem that must be solved when using multi-frequency signals. The precise det...

AI Technical Summary

Problems solved by technology

At present, for omnidirectional antenna multipath effect, the main method to reduce multipath effect is to increase the cut-off height angle by adding choke coils, suppression plates, absorbing nests and other devices on the hardware, but the result is not ideal.

Since multipath has a great influence on the pseudo code, which can reach the meter level, but the impact on the carrier phase observation value is at the centimeter level, so the carrier phase observation is generally used to estimate the multipath influence of the pseudo code observation during data processing. , but the multipath effect of carrier observations will be introduced in the process of processing

[0006](2) Low antenna gain

At present, the research on inter-frequency deviation calculation at home and abroad generally uses the observation data of omnidirectional antennas, but the omnidirectional antenna has small gain, low signal-to-noise ratio, and poor anti-multipath ability, which will affect the calculation accuracy of inter-frequency deviation.

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