GNSS signal capturing and tracking method and system based on dual-polarized antenna

A technology of signal tracking and signal acquisition, which is applied in the field of global navigation satellite systems and can solve problems such as poor sensitivity performance

Active Publication Date: 2014-09-24
WUHAN UNIV
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Problems solved by technology

[0004] Aiming at the deficiency that the existing GNSS receiver system only uses right-handed circularly polarized antennas to receive direct signals and has poor sensitivity performance in weak and complex signal environments, the present invention provides a method that can effectively improve GNSS signal acquisition and tracking method and system based on dual-polarization antenna for sensitivity and positioning performance

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  • GNSS signal capturing and tracking method and system based on dual-polarized antenna
  • GNSS signal capturing and tracking method and system based on dual-polarized antenna
  • GNSS signal capturing and tracking method and system based on dual-polarized antenna

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specific Embodiment approach

[0058] 1.1 High-efficiency weak signal capture strategy

[0059] First, use the RHCP signal capture channel to capture satellite signals, and extract the serial number of the uncaptured satellite. At this time, the satellite signal captured by the RHCP signal capture channel is the satellite signal with strong power. as a "strong signal". The strong signal capture is realized by the RF sampling down-conversion unit (1), the correlation channel (2) and the threshold judgment unit (3) in the RHCP signal capture channel.

[0060] Then, the coherent accumulation unit (4, 8) prolongs the integration time, and uses the RHCP signal acquisition channel and the LHCP signal acquisition channel to acquire the signals (ie weak signals) of the unacquired satellites respectively. During specific implementation, the integration time is lengthened by means of coherent accumulation, non-coherent accumulation or differential coherent accumulation, and a threshold judgment unit (5, 9) is used t...

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Abstract

The invention discloses a GNSS signal capturing and tracking method and system based on a dual-polarized antenna. The GNSS signal capturing method comprises the steps of receiving RHCP signals and LHCP signals through the RHCP antenna part and the LHCP antenna part respectively, capturing satellite signals based on the RHCP signals, extracting the serial numbers of non-captured satellites, prolonging the integral time, capturing signals of the non-captured satellites based on the RHCP signals and the LHCP signals, and capturing the signals of the same satellite or the signals of the different satellites respectively and synchronously based on the RHCP signals and the LHCP signals respectively. According to the GNSS signal capturing and tracking method and system based on the dual-polarized antenna, the direct signals and the echoed signals are synchronously received, and the satellite signals are processed and positioning is carried out based on the direct signals and the echoed signals. By adopting the GNSS signal capturing and tracking method and system based on the dual-polarized antenna, under the conditions of serious multi-path fading and poor signal environments, the sensitivity of a GNSS receiver can be improved under weak signal environments and complex signal environments such as cities and rooms.

Description

technical field [0001] The invention belongs to the technical field of Global Navigation Satellite System (GNSS), and in particular relates to a dual-polarized antenna-based GNSS signal acquisition and tracking method and system. Background technique [0002] GNSS is a satellite-based radio positioning and navigation system, including the US Global Positioning System (GPS), China's Beidou System (BDS), Europe's Galileo, and Russia's GLONASS system. GNSS signals are transmitted from satellites 20,000 kilometers away, and when they reach the antenna end of the ground receiver, the signals are weak and easily blocked or interfered. Therefore, GNSS receivers are used indoors, where the signal is weak or the signal environment is complex such as buildings and leaves. It is difficult to achieve positioning, and the positioning quality is not high. However, the demand for navigation applications in these environments is strong, so positioning in weak and complex signal environment...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S19/24G01S19/25
CPCG01S19/22G01S19/246
Inventor 林涛郭文飞牛小骥刘经南
Owner WUHAN UNIV
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