A dual one-way ranging system (DOWR) provides very high precision range measurements between two carrier phase transceiver-receiver systems by combining the one-way range measurements from each system. A key requirement for the DOWR system is the synchronization of the two one-way range measurement times, and this requirement makes it necessary to interpolate the raw one-way phase measurements toward a common epoch. This interpolation process may degrade numerical accuracy under large time-tag offsets. This study proposed a new interpolation process to reduce the degradation. Numerical simulation analysis was performed to validate the performance of the proposed method.
Wireless high-precision time synchronization between distributed nodes is the basis of autonomous application of nodes. In this paper, the signal transmission mode between nodes and the baseband processing algorithm of receivers are designed. On the basis of dual one-way ranging measurement and signal design system with semi-data-free modulation, the signal is divided into pilot branch without information and data branch with information. In the aspect of signal acquisition, coherent joint acquisition algorithm is used, and in the aspect of signal tracking, fusion algorithm is used to track code and carrier phase. Finally, the detection probability of the receiver and the mean square deviation of tracking error are simulated to verify the superiority of the coherent joint acquisition algorithm and the fusion tracking algorithm.
We prove that groups acting geometrically on delta-quasiconvex spaces contain no essential Baumslag-Solitar quotients as subgroups. This implies that they are translation discrete, meaning that the translation numbers of their nontorsion elements are bounded away from zero.