Performance Analysis And Configuration Technique Study Of Pseudolite Augmenting COMPASS

COMPASS is a global navigation and positioning satellite system that is beingimplemented by our self-developed and independent operation. The secondgeneration of the system, also known as COMPASS, began to offer passive locationservices to customers in December2012. As a newly-built system, COMPASS due toits limited constellation configuration, in some cases, such as mountain or urban cities,the navigation signals usually are unable to be received, so the presence of poorpositioning accuracy, integrity and reliability will bound the application ofCOMPASS more or less. Pseudolite positioning technique is a technology whosepotential can resolve the problems above. Pseudolite provide additional signalsource and improve the geometric strength of positioning solutions, Even in thesituation that completely lost the beidou satellite signal, the pseudolite canprovide independent positioning service. So the study of pseudolite positioningrelated technologies for enhancing COMPASS has important application value.Relying on “863” project, positioning technology and configuration to ofpseudolite augmented COMPASS was theoretical analyzed and applied studied inthis paper. On the theoretical basis of COMPASS components and the technicalprinciple of pseudolite enhancing COMPASS, the pseudolite networking schemewhich is to augmenting COMPASS was proposed, and the work program and keytechnology were analyzed. In the technical background of network system above, theperformance of COMPASS augmented by pseudolite was analyzed, the dilution ofprecision (DOP) is the The most intuitionistic measure of the accuracy of satellitepositioning system, The influence factors of positioning error was analyzed andcalculated methods was derived from the positioning equation. One-day Beidouobservations and adding pseudolite were applied to the simulation. The configurationof pseudolites has been further studied by using DOP’s value as a measure: Theinfluence of one pseudolite’s location to the system’s accuracy was analyzed bysimulation in the first situation that demands the precise positioning, how to select thenumber or location of pseudolite was also presented in the simulation results; In the second situation where the reciver unable to positioning with insufficient number ofBeidou satellite, the distribution of precision and changing rules were analyzed in thissimulated area； In order to meet the navigation need in the situation whenCOMPASS is out of use, the four satellites and five satellites pseudolite-onlyconfigurations were given through simulations.The simulation results of adding pseudolite to COMPASS turned out thatpseudolites can effectively enhance the COMPASS constellation geometry intensityand improve the positioning accuracy of the coverage area. The simulation and designresults of pseudolites’ configuration in those three cases above can provide someuseful references for practice.