Abstract: Systems, methods, and computer program products for determining a location from non-line-of-sight (NLOS) signals are described. A processor can determine that multipath interferences of a signal reaching a receiver through different paths that are close in lengths may be mistakenly interpreted as additional time shift, (e.g., additional time delay or, in some cases, time advance) of the signal in calculating a timing of the signal. The processor can determine the possible differences between path lengths and then determine an amount of the additional time shift. The processor can determine a shift correction to remove effects caused by the additional time delay from the timing calculation.

Abstract: Systems, methods, and computer program products for determining a location from non-line-of-sight (NLOS) signals are described. A processor can determine that multipath interferences of a signal reaching a receiver through different paths that are close in lengths may be mistakenly interpreted as additional time shift, (e.g., additional time delay or, in some cases, time advance) of the signal in calculating a timing of the signal. The processor can determine the possible differences between path lengths and then determine an amount of the additional time shift. The processor can determine a shift correction to remove effects caused by the additional time delay from the timing calculation.

Abstract: Systems, methods, and computer program products for determining a location from non-line-of-sight (NLOS) signals are described. An RF receiver can receive signals of an RF transmitter (e.g., a GNSS satellite) reflected by one or more building surfaces. A processor embedded in or coupled to the RF receiver can reduce the effects of multipath interference caused by the reflections using data on reflective characteristics of buildings located close to the RF receiver. The data can include information on which surfaces of the buildings are visible to the RF receiver. The processor can then estimate, from the visible surfaces and known satellite locations, feasible signal paths for a signal from a satellite to the RF receiver. The processor can then correct a location estimation by taking into account the multipath effects of the signal traveling along the feasible signal paths.