A Novel Residual Frequency Estimation Method for GNSS Receivers

Abstract

In Global Navigation Satellite System (GNSS) receivers, residual frequency estimation methods are traditionally applied in the synchronization block to reduce the transient time from acquisition to tracking, or they are used within the frequency estimator to improve its accuracy in open-loop architectures. There are several disadvantages in the current estimation methods, including sensitivity to noise and wide search space size. This paper proposes a new residual frequency estimation method depending on differential processing. Although the complexity of the proposed method is higher than the one of traditional methods, it can lead to more accurate estimates, without increasing the size of the search space.

Two-Step Frequency Estimation of GNSS Signal in High-Dynamic Environment

“…is is because based on (19) the integration time is long, and the integration peak value is large. 2) and (10), the computations of the proposed method can be obtained. Here, the BASIC [11] is chosen as the benchmark for the coarse MF estimation.…”

“…However, because of the trade-o between the Doppler frequency resolution and the computational complexity, the maximum error of carrier frequency estimation depends on the number of FFT points. To improve the Doppler frequency accuracy, Nguyen et al [10] proposed a residual frequency estimation method with di erential processing. Due to the di erential processing, it performs not well in the low SNR.…”