Beidou Navigation System And Long-Distance ZigBee Application In Fishery System

As a strategic infrastructure of our country, Beidou satellite navigation system is playing a key role in providing time-space datum and the real-time dynamic position related information. Making use of Beidou satellite navigation to ensure the safety of the national economic construction of our country has been becoming research focus. Based on the character of Beidou satellite navigation system and long distance ZigBee communication in Fishery, this paper conducts the following study.Firstly, in order to solve the problem of maritime positioning, based on extended Kalman filter model, this paper proposes a kind of combination RTK solution method for a single-frequency GPS/BDS, which uses the pseudorange and the observed value of carrier phase to make zenith delay estimation for troposphere delay. And based on the result of Kalman filter of the double difference observation equation for the composition of the rovers and the blurriness between the stations of GPS and BDS, this paper obtains a single difference ambiguity float solution and covariance matrix. Using the SX-UM220-DB2 GPS/Beidou satellite navigation development board and dual system of high-performance GNSS module of BDstar Navigation UM220. calculating method is proven to be feasible.Secondly, cooperated the shipborne terminal, this paper designs the wireless terminal, which is designed to extend shipboard terminal hardware functions to achieve the multiple serial data transfer. This design increases wireless AP function and WDS bridging function, which expanded the coverage of the fisheries monitoring system.Experimental results show that the wireless terminal has good stability, and the use of the wireless terminal WiFi module makes a handheld wireless terminal be taken in Beidou navigation system.Finally, Based on Beidou ship terminal, according to the requirements of maritime communication long distance ZigBee communication design, and the requirements of sending remote data with GPRS, this paper designs beidou wisdom terminal.By the two terminals, this paper set up the marine fishery monitoring system to ensure the safety of the fishery.All the relevant position precision and real-time communication proposed in this paper can meet the requirements of the marine fishery safety.