GPS spoofing signal detection and compensation method in DGPS reference station

DGPS transmits pseudorange correction (PRC) to user receivers to improve the position precision. Spoofer generates a fake GPS signal and transmits this signal to the target receiver. If a DGPS reference receiver is spoofed, not only reference position but also many user positions are affected. Moreover, DGPS reference station is easy to spoof because its position is known and fixed. Therefore, the study on the spoofing signal detection and compensation method in DGPS is necessary. This paper proposes a method to detect and compensate spoofing signal in DGPS reference station. The method removes the common terms by using the known fixed position of DGPS reference station to separate the measurement changing rate caused by spoofing signal. This changing rate is reflected to compensate the effect of spoofing signal. The proposed method is verified and validated by using a software-base simulator.