CROSS-CORRELATION MITIGATION ALGORITHMS FOR GNSS SYSTEMS USING COMMON OVERLAY CODES

摘要

PROBLEM TO BE SOLVED: To solve the problem with an attempt to detect a signal from a weak SV in which a receiver may mistakenly identify leakage of a signal from a strong SV as being from a different SV, which can impair accuracy of position estimation.;SOLUTION: Methods and systems for evaluating Global Navigation Satellite System (GNSS) signals are provided. Each of a first GNSS signal received by a GNSS receiver and a second GNSS signal received by the GNSS receiver is accessed. The second GNSS signal can have temporal fluctuations weaker than temporal fluctuations in the first GNSS signal. A delay between a sequence in the first GNSS signal and a corresponding sequence signal in the second GNSS signal is estimated and compared to a threshold. Upon determining that the delay exceeds the threshold, a location is estimated using both the first GNSS signal and the second GNSS signal.;SELECTED DRAWING: Figure 2;COPYRIGHT: (C)2019,JPO&INPIT