FPGA Based GPS Receiver Design Considerations

Multipath signals problem is still the main challenge for the global positioning system (GPS) receiver to obtain an accurate localization measurement. However, many techniques have been developed to mitigate the impact of these undesired signals at the expense of adding a burden to the GPS receiver design. Even though, none of the techniques in the works of literature was able to solve the loose signal lock issue efficiently. In this piece of work, we used a new approach to maintain the tracking synchronization when the receiver moves from outdoors to indoors /harsh environment. We design a dynamic narrow correlator in the delay lock loop, which made the space between the early and late correlators adjusted according to the receiver’s location. Consequently, this will enable the receiver to keep tracking the received GPS signal in a challenging environment and reduce the thrashing the available resources (power/processing) to acquire the GPS signal again. The results show that the ranging error has been reduced in comparison with a traditional narrow correlator, as well as the bit transition in the in-phase arm has been also maintained.

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Waveform and receiver design considerations on wideband CDMA

IEEE Personal Communications ◽

10.1109/98.799617 ◽

1999 ◽

Vol 6 (5) ◽

pp. 24-30 ◽

Cited By ~ 3

Author(s):

L.B. Milstein

Keyword(s):

Receiver Design ◽

Wideband Cdma ◽

Design Considerations

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A Study on GDOP for Vector-Based Tracking Loop GPS/INS Receiver

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.313-314.1175 ◽

2013 ◽

Vol 313-314 ◽

pp. 1175-1179

Author(s):

Hui Wang ◽

Xiao Guo ◽

Yu Li Jun

Keyword(s):

Design Method ◽

Line Of Sight ◽

Receiver Design ◽

Gps Receiver ◽

Tracking Loop ◽

Current Position ◽

Vector Tracking ◽

Geometric Dilution Of Precision ◽

The Relationship ◽

Unit Vectors

Geometric Dilution of Precision (GDOP) value will become larger when the number of visible satellites is less than four or the geometry of satellite constellation is poor, a GDOP Chimney Peak phenomenon is also easy to emerge [, the positioning accuracy of GPS receiver will be affected seriously. A vector-based tracking loop GPS/INS receiver design method is proposed in this paper. The current position of receiver is given by INS, Line-of-Sight (LOS) unit vectors between receiver and satellites will be built, which are transmitted into vector tracking loop, the relationship between LOS and GDOP is introduced in detail. Pseudorange and pseudorange-rate are used as measurements to design navigation filter. The simulation results demonstrate that proposed vector tracking method can avoid GDOP Chimney Peak phenomenon, position Root Mean Square error is less than 10 meters.

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