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Wireless Sensor Network (WSN) is nowadays being applied in many different civilian applications like vehicle tracking, habitat monitoring, forest surveillance, earthquake observation, biomedical or health care applications and building surveillance. To a large extent the effectiveness of the wireless sensor networks depends on the coverage provided by the sensor deployment scheme. There are different deployment demands and optimization goals in different environment. In this paper, firstly the existing deployment method of sensor network nodes is summarized and discussed. Then three performance evaluation indexes are analyzed in detail. At last, the main deployment model of sensor network nodes is presented.
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