Robustness and Accuracy Analysis of a Compatible Narrow Correlation Assisted Double Delta Algorithm

Abstract

Double Delta is an anti-multipath algorithm which is now widely used. It uses a set of narrow correlation and a set of wide correlation to correct phase function, and has a high resolution phase detector. It has the advantages that can effectively take up medium or long delays multipath with fewer resources. Previous studies and experiments have proved the anti-multipath performance of Double Delta algorithm, however the lack of studies that its poor traction easily lead to loss of lock and error code loop lock problem. In this paper, the above problem is considered, the multipath error envelope and the discriminator S-curve of Double Delta technical in BPSK and BOC signals is compared and it can be found that Double Delta technical also has good anti-multipath performance in BOC signal but error lock phenomenon is more prominent. Then a narrow correlation assisted Double Delta tracking method is put forward. The advantage in the robustness without the loss of tracking accuracy is proved through simulation and testing. It can detect false lock problem of Double Delta and make it suitable for the new GNSS signal such as BOC signal. The improved method enhances the robustness and compatibility of the tracking loop, and the consumption of additional hardware resources and the algorithm complexity is low. The results have a certain reference value of the receiver’s anti-multipath channel design and engineering implementation.