| 摘要 |
PURPOSE: An interface between ground systems in a local area augmentation system and a method for controlling data flow between the ground systems are provided to enhance the reliability by monitoring operating states between a GPS receiver and data processing computers and controlling the data flow between the systems. CONSTITUTION: An interface between ground systems in a local area augmentation system includes the first RS-232 communication protocol interface(I-1,I-2), the first LAN interface(I-3), the second LAN interface(I-4), the third LAN interface(I-5), the fourth LAN interface(I-6), and the second RS-232 communication protocol interface(I-7). The first RS-232 communication protocol interface is used for providing an input and an output control signal for receiving GPS values from the first and the second GPS receivers(1,2) to the first and the second PC servers(3,4). The first LAN interface is used for monitoring and controlling operating states of the first and the second PC servers by using a ping command between the PC servers. The second LAN interface is used for transmitting error correction messages of the first and the second PC servers to a multiplexer(5) and monitoring and controlling operating states of the first and the second PC servers and the multiplexer by using a ping command between the first and the second PC servers and the multiplexer. The third LAN interface is used for transmitting a data packet of a VHF receiver(7) to the first and the second PC servers. The fourth LAN interface is used for transmitting an error correction message from the second PC server to the multiplexer when the first PC server is out of order. The second RS-232 communication protocol interface is used for transmitting the error correction messages of the first PC server or the second PC server from the multiplexer to a VHF transmitter(6).
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