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In this article, Wireless Ad hoc Networks and routing classification are briefly presented and ZRP Routing Protocols are analyzed. In large wireless Ad hoc networks, ZRP routing protocol takes long time to find routing path. It puts forward the improved routing protocol IZRP. This protocol uses the Beidou satellite to transmit route request and uses the control center to calculate the routing path. At last, this article verity the ZRP Routing Protocol and IZRP Routing Protocol using the software platform of Opnet Modeler and get the conclusion that under the condition of more nodes , IZRP routing protocol routing time delay is short, high efficiency.

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