A Satellite Navigation Relative Timing Method for GNSS-R Miniaturized Passive Location Systems

Multi-station cooperative reconnaissance and positioning can improve the signal processing gain and positioning accuracy of GNSS-R. However, if the time synchronization between stations is not precisely performed, there will exist slowly time-variant positioning errors. Furthermore, under the circumstance of limited platform volume, load capacity, processing power and cost, the traditional time-position synchronization methods which rely on high-speed data links to complete the time-position synchronization cannot work well. For such specific applications, this paper presents a relative timing method based on the common view principle of navigation satellite, which is totally independent of any communication links. The relative positioning and timing principle and algorithm model is introduced. The main accuracy affective factors is analyzed and the experiments are carried out to verify the conclusions. The results show that, in the case of short baselines at the 10km, the relative time synchronization accuracy can be better than 7ns.