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The Global Positioning System (GPS) is an extremely mature technique in the navigation and positioning field. However, there are still some limits in some aspects and for some special applications. The main limitation of the GPS use indoors are the low signal power and the presence of multi-paths, which may affect significantly the signal acquisition and tracking accuracy. The performance of GPS needs to be improved with technological advances. As a GPS-like ground transmitter, the Pseudolite provides a new research direction to achieve high positioning accuracy and reliability. Pseudolites (short for pseudo-satellites) are local transmitters on Earth that output GPS satellite signals in order for augment the GPS system for use in locations where satellite signals may be obstructed.
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