Design Of Image Scout Sensor For Three-dimentional Monitoring In Battlefield

Wireless Multimedia Sensor Networks (WMSNs), developed from traditional Wireless Sensor Networks (WSNs),is a novel sensor network integrating sensation functions of multimedia streaming (e.g. audio, video, image).Compared with traditional WSNs which can only measure simple scalar physical phenomena,Wireless Multimedia Sensor Networks are able to ubiquitously retrieve multimedia content such as video, audio streams and still images.Potential applications of Wireless Multimedia Sensor Networks span a wide spectrum to military.Wireless Multimedia Sensor Networks have broad application foreground in military, especially in three-dimentional monitoring in battlefield.Supported by the National Science Foundation of PR China"Image compression algorithm and its multi-nodes cooperative transmission strategy for wireless multimedia sensor networks"(Grant No. 60872151), this dissertation concentrates its attention on the key technology of image scout sensor. The main contents and contributions of this dissertation are as follows:1. The advantages of multimedia sensor are comprehensive reviewed, the shortcomings and military applications of the image scout sensor and the development of multimedia sensor node at home and abroad are introduced.2. The RSA and RS algprithm are studied to relize the security and reliable transmission of image information. First, the security algorithms are analyzed and compared to choose the RSA algorithm and study its optimization; then the error correction coding algorithms are analyzed and compared to select the RS algorithm and study its optimization and simulate it by matlab; finally , the two algorithms are used and simulated to decide the their order.The results show that during information processing, first RSA encryption and then RS error correction coding not only has a relatively low error rate, but also processes faster .3. The wireless transmission protocols of sensor network are analyzed to choose the wireless transmission chip of nrf2401 for WMSNs, then the experiment research of nrf2401 is taken, the result of the experiment show that the actual transfer rate of nrf2401 is 156kbps and transmission distance 32 meters. Consistent with theoretical analysis, the experiment shows that nrf2401 is appropriate for image scout sensor4. The principle of LBT and binary LBT and fixed-point LBT are introduced and compared, then the DSP parallel processing based on LBT fixed-point algorithm is proposed and the experiment is taken, the result shows that this treatment effectively solve the problem of real-time image compression in WMSNs.5. A new image scout sensor is designed.The sensor has the OV9650 for image information acquisition, DSP chip TMS320C6204 for processor, Flash chip HY29LV160 for the system code memory, SRAM chip CY7C1049DV33 for data stream cache, nrf2401 for information transmission.