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Signal tracing algorithm of GNSS receiver

A signal tracking and GPS signal technology, applied in the field of navigation and positioning, can solve the problems of Doppler measurement error and low tracking accuracy, and achieve the effect of reliable signal tracking, high sensitivity, and high navigation estimation accuracy

Inactive Publication Date: 2014-05-21
ZHEJIANG SCI-TECH UNIV
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AI Technical Summary

Problems solved by technology

For the commonly used VDFLL, when the phase error of the tracking loop increases, it will cause a large Doppler measurement error. This is the defect of FLL (Frequency Locked Loop). However, the range of FLL tracking carrier frequency is wide, that is, the FLL tracking range Wide but low tracking accuracy

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  • Signal tracing algorithm of GNSS receiver
  • Signal tracing algorithm of GNSS receiver
  • Signal tracing algorithm of GNSS receiver

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Embodiment Construction

[0035] In order to describe the present invention more specifically, the technical solutions of the present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0036]The vector tracking loop reduces the tracking threshold, has higher estimation accuracy, and has better performance than scalar tracking under weak GNSS signals. However, vector tracking also has its disadvantages. If the signal of a certain GNSS satellite is interrupted or the error is large, it will affect the tracking accuracy of other channels, which may cause the vector tracking loop to lose lock. The scalar tracking algorithm is not affected by this. When the signal of a certain satellite is temporarily interrupted or the error is large, it will not affect the signal tracking of other channels. By taking certain measures, the accuracy of positioning calculation can still be maintained. Therefore, this embodiment first adopts the switching mech...

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Abstract

The invention discloses a signal tracing algorithm of a GNSS receiver. The signal tracing algorithm is capable of overcoming the phase-locked loop lock loosing problem by means of a frequency locking / phase locking cascade tracking loop, after the phase-locked loop is unlocked, a frequency locking loop helps the phase-locked loop to restore quickly, and moreover, a loop filter reset scheme is designed to control the error between the output value of the loop filter and the Doppler observed value at the last time, so that the phase-locked loop is fastened to restore from the lock loos state. The signal tracing algorithm automatically switches between a vector tracking loop and a scalar tracking loop according to the signal environment so as to improve the usability and dynamic property of the receiver. Whether the signal to noise ratio is low or the signal is momently interrupted due to shield, the performance of the receiver is not lower than the ordinary GNSS receiver, the influence of the accumulative error caused by the signal failure or interference of a satellite on the other satellite signal processing channels is avoided, and the system stability and the location output reliability are improved.

Description

technical field [0001] The invention belongs to the technical field of navigation and positioning, and in particular relates to a signal tracking algorithm of a GNSS receiver. Background technique [0002] Satellite Navigation and Positioning System (GNSS) is a satellite-based radio navigation system that can provide all-weather, uninterrupted, high-precision, real-time navigation and positioning services for various carriers on land, sea and air. Various fields of daily life, such as ground traffic supervision, aircraft and ship navigation, precision timekeeping, geodetic surveying, etc. At present, the GPS system, the earliest developed and applied satellite positioning system in the world, has been widely used in my country. my country is independently developing the global satellite positioning system BDS (Beidou Second Generation), which has been provided in my country and its surrounding areas by the end of 2012. positioning service. Therefore, satellite navigation re...

Claims

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Application Information

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IPC IPC(8): G01S19/23G01S19/24
CPCG01S19/254G01S19/29G01S19/30
Inventor 高法钦
Owner ZHEJIANG SCI-TECH UNIV
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