Analysis on Velocity Measurement Precision of High Dynamic GPS Receiver Carrier Tracking Loop

2015 ◽  
pp. 35-43
Author(s):  
Xudong Liu ◽  
Guangjun Liu ◽  
Qiang Li ◽  
Haiying Luo
Keyword(s):  
Velocity Measurement ◽  
Measurement Precision ◽  
Gps Receiver ◽  
Tracking Loop ◽  
High Dynamic

A high-sensitivity GPS receiver carrier-tracking loop design for high-dynamic applications

GPS Solutions ◽  
2014 ◽  
Vol 19 (2) ◽  
pp. 225-236 ◽  
Author(s):  
Xinlong Wang ◽  
Xinchun Ji ◽  
Shaojun Feng ◽  
Vincent Calmettes
Keyword(s):  
High Sensitivity ◽  
Gps Receiver ◽  
Tracking Loop ◽  
Loop Design ◽  
High Dynamic

Implementation and Performance Assessment of a Vector Tracking Method Based on a Software GPS Receiver

2011 ◽  
Vol 64 (S1) ◽  
pp. S151-S161 ◽  
Author(s):  
Sihao Zhao ◽  
Mingquan Lu ◽  
Zhenming Feng
Keyword(s):  
Global Positioning System ◽  
Carrier Frequency ◽  
Gps Receiver ◽  
Tracking Loop ◽  
Frequency Tracking ◽  
Tracking Method ◽  
Global Positioning ◽  
Vector Tracking ◽  
Tracking Loops ◽  
And Performance

A number of methods have been developed to enhance the robustness of Global Positioning System (GPS) receivers when there are a limited number of visible satellites. Vector tracking is one of them. It utilizes information from all channels to aid the processing of individual channels to generate receiver positions and velocities. This paper analyzes relationships among code phase, carrier frequency, and receiver position and velocity, and presents a vector loop-tracking algorithm using an Extended Kalman filter implemented in a Matlab-based GPS software receiver. Simulated GPS signals are generated to test the proposed vector tracking method. The results show that when some of the satellites are blocked, the vector tracking loop provides better carrier frequency tracking results for the blocked signals and produces more accurate navigation solutions compared with traditional scalar tracking loops.

Research on INS-Aided GNSS Carrier Tracking Loop in High Dynamic Circumstance

2013 ◽  
Vol 464 ◽  
pp. 215-221
Author(s):  
Xin Long Wang ◽  
Chuan Jun Li ◽  
Xing Cheng Li
Keyword(s):  
Dynamic Environment ◽  
Coupled System ◽  
Tracking Performance ◽  
Tracking Loop ◽  
Loop Control ◽  
Closed Loop Control System ◽  
Loop Control System ◽  
Tightly Coupled ◽  
High Dynamic ◽  
The Stability

GNSS receiver will produce a large Doppler shift in high dynamic environment, thus causing lock-lose of the tracking loop. INS-aided GNSS tightly coupled system can improve tracking performance in high dynamic environment by introducing the Doppler information estimated by INS. Through analyzing by the theory of closed loop control system theory and numerical simulation of the INS-aided carrier tracking loop, the results show that INS-aided carrier tracking loop can obviously improve the stability of carrier tracking performance and anti-jamming ability of the satellite navigation receiver in high dynamic circumstance.

A Cascade Tracking Loop for Weak GPS Signals

2015 ◽  
Vol 719-720 ◽  
pp. 1116-1123 ◽  
Author(s):  
Ming Xing Shi ◽  
Bi Yu Tang ◽  
Ao Peng
Keyword(s):  
Carrier Phase ◽  
Frequency Estimation ◽  
Measuring Error ◽  
Phase Estimation ◽  
Weak Signal ◽  
Gps Receiver ◽  
Tracking Loop ◽  
Signal Tracking ◽  
Tracking Process ◽  
Cascade Structure

It’s important to get accurate carrier phase and frequency information when using a standalone GPS receiver. In weak signal applications, to keep a stable tracking is hard to achieve because measuring error will be huge when the SNR is low. Different methods are used to improve the SNR before the detector in a tracking process, such as coherence integration. And this paper keeps eyes on a different viewpoint, on how to refine estimation results. A cascade structure is introduced for weak signal tracking. This structure is divided into two levels. In the first level, raw phase estimation and accurate frequency estimation is provided to achieve stable work in low CNR environment. In the second level, the raw phase estimation is refined to achieve accurate tracking requirement. This cascade structure can also work jointly with any other SNR-improving technology to get a better performance.

GPS Receiver Performance Enhancement via Inertial Velocity Aiding

2001 ◽  
Vol 54 (1) ◽  
pp. 105-117 ◽  
Author(s):  
Dah-Jing Jwo
Keyword(s):  
Performance Enhancement ◽  
Transfer Functions ◽  
Gps Receiver ◽  
Tracking Loop ◽  
Tracking Errors ◽  
Dynamic Tracking ◽  
Tracking Loops ◽  
Receiver Performance ◽  
Velocity Information ◽  
Lock In

An integrated GPS/INS navigation system can employ inertial velocity information to produce a more robust system. For a stand-alone GPS receiver, decreasing the receiver tracking loop bandwidth reduces the probability of losing lock in a jamming or interference environment if vehicle dynamics are low. However, reduced bandwidth increases tracking errors when dynamics are present. Beyond a certain limit, it causes a serious degradation in the dynamic tracking loop performance. Providing inertial velocity aiding to the receiver tracking loops is an effective and popular treatment to help resolve this problem. In this paper, performance of the GPS receiver tracking loops using inertial velocity aiding will be investigated. Different types of tracking loops, from 1st to 3rd order, are covered. Following the discussion of the system architecture and derivation of the related transfer functions for the tracking loops, both with and without aiding, the system performance, including transient response, steady-state error, and noise bandwidth is evaluated.

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