The Study Of The Pesudolite Positioning System

For satellite positioning system, the pesudolite is a very useful augmentation method. It can not only enlarge the satellite positioning system's coverage area in complex circumstance, but also enhance the whole system's stability, reliability and precision. Meanwhile, the pesudolite can be built in an independent system to achieve positioning. Pesudolite principal and subordinate structure adopted in the pesudolite positioning system is studied. During the course of positioning, the pesudolite transmission positioning method, which the principal pesudolite transmits signals to the user receiver and the subordinate pseudolites, then the subordinate pseudolites transmit the signal received from the principal pesudolite to the user receiver, is studied.Firstly, the pesudolite linearization single point positioning algorithm based on Gauss-Newton iteration is investigated in this dissertation, then the pesudolite transmission positioning algorithm is presented, in which the receiver clock offset and the common error of pesudorange measure are eliminated. Secondly, the serial communication protocol is investigated, different programming methods are contrasted and the programme flow chart is presented. Thirdly, several pesudolite design schemes are introduced. The pesudolite key technologies are also analyzed here, and then the time synchronization principle is introduced and the pesudolite quadrature demodulator is designed which is used for distilling the synchronization pulse. In the end, the optimize geometry of pseudolites based on BeiDou positioning system is discussed in detail. The foundational theory of optimize geometry is analyzed, then the simulation is carried out and the conclusions are also given.