scholarly journals A GPS multipath mitigation technique using correlators with variable chip spacing

2019 ◽  
Vol 94 ◽  
pp. 03006
Author(s):  
Jin Hyuk Lee ◽  
Deok Won Lim ◽  
Jae Hee Noh ◽  
Gwang Hee Jo ◽  
Chansik Park ◽  
...  
Keyword(s):  
Performance Analysis ◽  
Tracking Error ◽  
Integration Time ◽  
Software Platform ◽  
Multipath Mitigation ◽  
Code Tracking ◽  
Similar Performance ◽  
Multipath Signals ◽  
Mitigation Technique

Various methods have been studied to mitigate the influence of multipath signals, representative methods focused the correlator structure are the Narrow Correlator and the Multipath Elimination Technique (MET). It is known that the MET has better performance than Narrow Correlator but it requires more complexity. In this paper, we propose a technique that has similar performance to the MET and it uses only three correlators like the Narrow Correlator. This technique switches the chip spacing of the correlators for each Predetection Integration Time (PIT) and applies it to the MET. For the performance analysis, we implemented a software platform and compared the code tracking error of the proposed technique with that of the Narrow Correlator and the MET.

Modified High-Resolution Correlator Technique for Short-Delayed Multipath Mitigation

2009 ◽  
Vol 62 (3) ◽  
pp. 523-542 ◽  
Author(s):  
Hyoungmin So ◽  
Ghangho Kim ◽  
Taikjin Lee ◽  
Sanghoon Jeon ◽  
Changdon Kee
Keyword(s):  
High Resolution ◽  
Tracking Error ◽  
Satellite System ◽  
Test Results ◽  
Multipath Mitigation ◽  
Error Sources ◽  
Gnss Positioning ◽  
Multipath Signals ◽  
Global Navigation Satellite ◽  
Mitigation Technique

Multipath is one of the main error sources in global navigation satellite system (GNSS) positioning. The high-resolution correlator (HRC) is a multipath mitigation technique well known for its outstanding performance for mid-delayed multipath, but still has a remaining error for the short-delayed multipath. This paper proposes a modified HRC scheme that can remove or reduce the error for short-delayed multipath signals. It estimates the HRC tracking error and augments the conventional HRC with the estimates. The method was implemented with a software receiver and the test results show short-delayed multipath-induced errors were reduced to about one third of those from the conventional HRC.

The Solid State Area Scanner Photometer

1983 ◽  
Vol 62 ◽  
pp. 220-223
Author(s):  
Karl D. Rakos
Keyword(s):  
Solid State ◽  
Reduction Method ◽  
Tracking Error ◽  
Optical Quality ◽  
Integration Time ◽  
Spectral Dispersion ◽  
Periodic Error ◽  
State Area ◽  
Stellar Image

The accuracy of the area scanning technique depends on observing conditions resulting from seeing, tracking irregularities of the telescope, photon and seeing statistics (integration time and the size of the telescope), and the atmospheric spectral dispersion of the stellar image in the spectral region used. In addition, the reduction method as well as the mechanical and optical quality of the telescope and photometer influence the accuracy of the results.The tracking error of the telescope is usually larger than the observer believes. The amplitude of the periodic error of the worm gear is at best ± 0.5 arc sec with period length between 4 and 10 minutes, depending on the particular telescope. Figure 1 shows the tracking error for the ESO 50 cm and 100 cm telescopes. Other telescopes usually fit in between this two extremes.

Delay-Locked Loop for Pseudorange Measurement over Frequency-Selective Fading Channels

2013 ◽  
Vol 303-306 ◽  
pp. 2050-2053
Author(s):  
Ya Ting Wu ◽  
Yan Zan Sun ◽  
Xi Luo
Keyword(s):  
Fading Channels ◽  
Spread Spectrum ◽  
Error Characteristic ◽  
Selective Fading ◽  
Code Tracking ◽  
Frequency Selective Fading ◽  
Delay Locked Loop ◽  
Frequency Selective ◽  
Multipath Signals ◽  
Frequency Selective Fading Channels

A delay-locked loop is proposed for accurate code tracking over frequency-selective fading channels in this paper. Taking advantage of the shift-and-add property of maximum length pseudorandom spread-spectrum sequences, the differential multiplier is employed to separate each multipath component and reduce the effects of other multipath signals. The contribution of all the multipath signals is combined to enhance the error characteristic. Simulation results verify the performance improvement of the proposed loop.

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