Research On RAIM Technology Of Multi-GNSS Receiver

With the rapid development of global navigation satellite system, theinternational navigation territory pay much attention for the compatibility andinteroperability of multi-GNSS research. When multiple joint navigation system,increasing the probability of the emergence of a satellite failure, aviation safetypresented a huge challenge, so the solution of integrity which is closely geared tousers’ information security is particularly urgent. Receiver Autonomous IntegrityMonitoring (RAIM) is a common used integrity monitoring method, which canrapidly respond to identification of satellite failures, and can run automaticallywithout outside intervention. The research on RAIM technology of multi-GNSSreceiver has important significance for the construction and the evaluation ofnavigation satellite system.Currently, multi navigation technology is a hot research among scholars athome and abroad, but systematic study and analysis on multi RAIM technology arefew. So this paper based on the analysis of the principle and the performanceparameters of the RAIM technology, proposed implementation strategy of multiRAIM algorithm, and used the differences between multi and single-modenavigation system as research foundation, established a general algorithm model andgave a general processes of multi RAIM algorithm and methods of data integrationbetween multi navigation systems. While, this paper also used the traditionalsingle-mode RAIM algorithm for navigation data processing in multi system,researched and analyzed the specific fault identification process of single star andbinary stars fault RAIM algorithm based on multi in detail.Meanwhile, referred to drawbacks that existing in the common snapshot RAIMalgorithm, can only identification for a single star or binary stars fault, this paperimproved a random search RAIM algorithm, the improved algorithm break thetraditional fault identification algorithm research model, it not only reduces thecomplexity of the algorithm and improves the operational efficiency, but also appliesfor single-mode or multi navigation system, this algorithm will not limited to thenumbers of failed satellites, as well improved the RAIM algorithm extensive.Finally, this paper simulated the single star and binary stars fault RAIMalgorithm and the improved random search RAIM algorithm, the simulation results show that the identification performance of multi RAIM algorithm is better thansingle-mode RAIM algorithm both in single star and multiple stars fault than, thefault identification rate is significantly improved, and the improved random searchRAIM algorithm improved the fault identification rate, and increased the usefulnessof RAIM algorithm.