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

A ground-based augmentation system and near-far effect technology, which is applied in satellite radio beacon positioning systems, radio wave measurement systems, and measurement devices, can solve problems such as low average power average power, blocking interference, and receiving and processing interference, and achieve improved Usability, effects of improving robustness

Active Publication Date: 2016-03-09
交信北斗(浙江)科技有限公司
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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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  • Method for overcoming near-far effect by utilizing double antennas in pseudo-satellite ground-based augmentation system
  • Method for overcoming near-far effect by utilizing double antennas in pseudo-satellite ground-based augmentation system
  • Method for overcoming near-far effect by utilizing double antennas in pseudo-satellite ground-based augmentation system

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Embodiment Construction

[0020] The embodiments will be described in detail below in conjunction with the accompanying drawings.

[0021] The overall structure of the method mainly includes RF front-end, near-far effect detection and elimination, intermediate frequency signal capture and tracking, navigation message analysis and user position calculation, see figure 1 . In order to overcome the huge difference in the power of GNSS satellites and pseudolites, the present invention uses independent radio frequency front-ends to process GNSS satellite signals and pseudolites signals respectively, and uses dual antenna technology to place two antennas on the upper and lower ends of the aircraft respectively. The shielding effect on the signal itself, the GNSS satellite signal and the pseudolite signal are respectively received from the upper and lower spaces, so that the interference effect of the pseudolite on the GNSS satellite signal is overcome from the space. According to the characteristics of grou...

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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]...

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Application Information

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IPC IPC(8): G01S19/25G01S19/36
CPCG01S19/25G01S19/36
Inventor 刘建沈兵李晶于渊卢红洋
Owner 交信北斗(浙江)科技有限公司
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