Efficient Delay Tracking Methods with Sidelobes Cancellation for BOC-Modulated Signals

Side peak cancellation method for sine-BOC(m,n)-modulated GNSS signals

“…It should be noted however that even though the SCM method works also for generic BOC(m,n), several side peaks of reduced amplitudes are still present in its ACFs as shown in Figure 11 for BOC (10,5) reported in [8]. These later may be considered as MP ACFs on either side of the central peak which explains the increased MP envelope error and thus the increased MP running average error with regard to those of our proposed method as illustrated in Figure 12 for the same case of BOC (10,5).…”

“…Nevertheless, because both the received signal ACF and BOC-PRN ACF are affected by noise, their combination will introduce an additional amount of noise. In reference [8], the authors have proposed a side peak cancellation method (SCM) at tracking stage. Compared to ASPeCT, it has the advantage of providing lower complexity solution and is applicable to any sine or cosine, odd or even BOC modulation case.…”

“…Compared to ASPeCT, it has the advantage of providing lower complexity solution and is applicable to any sine or cosine, odd or even BOC modulation case. Besides, in the same paper, the authors studied the performances of the SCM with five different tracking loops and showed that the highest performance improvement is reached when combining with the narrow early-minus-late (EML) correlators and that the higher the BOC modulation order, the more advantageous it is to apply the SCM technique in order to cope better with the false lock points [8]. However, there are still some side peaks present in the resulted SCM ACF that can affect the tracking process and thus influence the MP reduction.…”

GNSS Signals Acquisition and Tracking in Unfavorable Environment

“…Consequently, several side peaks cancellation techniques were also proposed in the literature. As examples, we can cite Autocorrelation Side-Peak Cancellation Technique (ASPeCT) [22], Sidelobes Cancellation Method (SCM) [23], and General Removing Ambiguity via Side Peak Suppression (GRASS) method for only BOCsin signals [24]. We can mention also Simultaneous Perturbation Stochastic Approximation (SPSA) for BOCcos signals [25], No Central Peak ACF for BOCsin signals [26], Pseudo Correlation Function method for MBOC signals [24], Combined Correlation Functions method for BOCsin/cos, CBOC and Alternate BOC signals [27] and BOC-PRN (Pseudo Random Noise) method for BOCsin/cos signals [28].…”

A Novel BOC(n,n) Correlation Function for Maritime Satellite Communications

“…따라서 BOC 자기상관함수의 주변 첨두에서 동기화되는 모호성 (ambiguity) 문제가 발생 할 수 있다 [2] . 이 문제를 해결하기 위해 상관함수의 주변 첨두를 직접적으로 제거하는 여러 신호 추적 방법이 제안되 어 왔다 [6][7][8][9] . [ Ⅱ. BOC 부분상관함수 BOC(n,n) 신호 는 다음과 같이 나타낼 수 있다.…”