Method for overcoming near-far effect by utilizing double antennas in pseudo-satellite ground-based augmentation system

Abstract

The invention belongs to the technical field of satellite navigation, and particularly relates to a method for overcoming a near-far effect by utilizing double antennas in a pseudo-satellite ground-based augmentation system. The method comprise the steps of: arranging the two antennas at the upper end and the lower end of an aircraft respectively, receiving GNSS satellite signals and pseudo-satellite signals from upper and lower spaces respectively by utilizing the signal blocking function of the aircraft, performing RF front-end processing on the signals respectively, and adjusting RF channel gain; detecting the pseudo-satellite signals, adding an acquisition and tracking channel with high threshold, eliminating the near-far effect between pseudo-satellites through suppressing the strong pseudo-satellite signal, and reconstructing the strong pseudo-satellite signal; and acquiring and tracking the GNSS satellite signals and the pseudo-satellite signals, and adopting a double-antenna navigation positioning method for carrying out analysis and position calculation on a navigation message.

Description

technical field [0001] The invention belongs to the technical field of satellite navigation, and in particular relates to a method for overcoming the near-far effect by using dual antennas in a pseudolite ground-based augmentation system. Background technique [0002] With the continuous advancement of technology and the continuous development of my country's satellite industry, pseudolite technology has attracted more and more attention. The pseudolite technology was proposed by Beser and Parkinson in 1982. It replaces or assists GNSS satellites by GNSS navigation signal transmitters installed on aircraft or on the ground to realize navigation and positioning functions. In the case of satellite signal interference in the battlefield environment, or when the visibility of satellites is suppressed in urban canyons and mountainous areas, pseudolite technology can be used to enable user receivers to still have high availability and navigation and positioning accuracy. [0003]...

AI Technical Summary

Problems solved by technology

[0005] In the pseudolite ground-based augmentation system, there are two main ways to cause the near-far effect: First, the distance from the GNSS satellite to the user receiver is generally much larger than the distance from the pseudolite to the user receiver, which leads to the arrival of the GNSS satellite signal. The average power of the receiver is much smaller than the average power of the pseudolite signal reaching the receiver, and the stronger pseudolite signal will cause blocking interference to the GNSS satellite; the second is that a certain pseudolite is closer to the user receiver, resulting in The pseudolite interferes with the reception and processing of other pseudolite signals farther away

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