| Faced with the current complicated international market, the argumention of COMPASS with other systems is necessary for continuous and accurate navigation. In such sitiuations, in order to ensure the global market and truly enhance the competitiveness of our country, it is very necessary that we should build our own satellite navigation system, which required to have an great impact on the influential international popular satellite navigation systems in terms of aspects of how to maintain interoperability and compatibility with those satellite navigation systems. Comparing with single-system navigation receiver, multi-system compatible positioning satellite navigation receiver has more coverage. Whenever the matter under what natural circumstances, it can ensure to provide a stable and reliable satellite navigation and positioning services and achieve a series of other high-quality performances.Therefore, fundmental principles and key communication technologies are applied in the construction of the satellite navigation and positioning system contiunous, it will make the satellite navigation system more stronger. In this thesis, a kind of configurable COMPASS and GPS multi-mode single-frequency integrated satellite navigation and positioning terminal was discussed in detail. The multi-mode refers to the receiving terminal system can receive and handle all the signals from the COMPASS and GPS satellite system at the same time. The design of single-frequency refers to the basic structure of the receiving antenna, whose performance can be compatible with COMPASS B1 band and GPS L1 band. The desiged software system of the satellite receiver is not only limited to the multimode combined COMPASS and GPS positioning, but also can realize the single COMPASS or GPS positioning system mode alone.In this research, a kind of software for the multi-mode single-frequency positioning and navigation system is designed, which can send and receive messages via the simulation Bluetooth serial port. This thesis raises and gives out the basic sturcture of the software and hardware environment of the receiving terminal. First, the composition and development of the GNSS system are introduced in detail and a discussion of the difference of the satellite constellation of COMPASS and GPS satellite systems are studied. Then, two different structure for the design of the integrated navigation positioning receiving terminal is discussed. Furthermore, the format of navigation message data NMEA 0183 is analyzed, COMPASS and GPS data acquisition method is discussed in detail. At last, it realizes a software program of the build-up satellite navigation terminal using the C++ programming language. This software system has the following features:the positioning mode can be controlled, a bluetooth serial port data reception, parsing and processing the NMEA navigation message as well as display where I am on the Web map and so on.In this thesis, the construction of the whole system is finished, experiments are carried out to test the design of the proposed scheme via bluetooth serial interface. Those experimental results demonstrate that the entire system works stably, has friendly interface and better expansibility, which basically meets the requirements of the original design. |
PDF Full Text Request