| At present, information exchange between cells of underwater and above water is completed by hardware system which is designed by oneself with PCI or other bus and driver circuit. These methods have many disadvantages, such as difficult testing, uncriterial hardware, the inferior stabitity of transmission and so on. So it is necessary to develop a sonar information transmission system which can adapt to many kinds of sonars and can connect embedded system eg.DSP and Internet conveniently. Development and research work based on multi-beam profiler in the paper are taken as follows:1. The design and implementation of hardware.The tasks of signal processing and data transmission are completed by two parallel TMS320DM642. There are two parts about hardware design: one is accomplishing two DM642 parallel via HPI depending on FPGA logic design, the other is accomplishing network transmission by connecting to Fast Ethernet PHY Transceiver LXT971A.2. The argumentation of software realization.According to the characteristic of embedded system and practical requirement, we use embedded TCP/IP protocol stack to accomplish the network transmission. After analyzing the basic protocol, some different realization methods are compared. At last,μC/OS-II (a embedded real time operating system which has open source code) and lwIP (a TCP/IP protocol stack which has open source code)are chose and why this method is chose is given.3. Software realization.The software realization and testing are discussed in this part. Software realization contains two parallel DM642, drivers for network equipment, the transportation ofμC/OS-II and lwIP, sockets programming. Software testing containsμC/OS-II testing and lwIP testing.After successfully debugged, sonar transmission system achieves desired aim. In order to test the actual performance of the system, some experiments were done. The system worked stabilized steadily and reliably, which forcefully guaranted experiments were successfully done. |
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