針對(duì)山區(qū)航道航標(biāo)系統(tǒng)環(huán)境的GPRS 信號(hào)差和直接GPS 定位困難，本文研究和設(shè)計(jì)
了一種基于WSN 和DGPS 進(jìn)行通信和定位的航標(biāo)網(wǎng)絡(luò)監(jiān)控系統(tǒng)。實(shí)驗(yàn)中利用ARM 板的LED 燈亮數(shù)來表示通信信號(hào)強(qiáng)度的方法來測試節(jié)點(diǎn)在空曠區(qū)和樹林里的通信的距離；用CC2420 提供的RSSI 測距功能進(jìn)行定點(diǎn)測試進(jìn)行曲線擬合的方法測定參數(shù)，并與高精度定位DGPS 結(jié)合進(jìn)行監(jiān)控系統(tǒng)的定位模擬測試，測試結(jié)果表明該方案能達(dá)到監(jiān)控精度在2.5m 左右的定位精度。
關(guān)鍵詞：無線傳感器網(wǎng)絡(luò)，差分全球衛(wèi)星定位系統(tǒng)，基于接收信號(hào)強(qiáng)度指示，航標(biāo)監(jiān)控
Abstract: Aiming at the difficulties of direct GPS locating and the weak or without GPRS
signals in the pharos system among mountain waterway, this paper studies and works out a type of navigation marks-monitored network system based on WSN and DGPS. In the tests, we tested communicating distance of nodes by measuring the signal strength both in open region and wooden region in recording the number of flashing LED on ARM board with CC2420 chip, and test out relative parameters in some fixed points using RSSI provided by CC2420 with a method of least square curve fitting. A simulated locating test of monitoring system is generated with a result of 2.5m-precision achieved in the designed system after a combination using of RSSI with tested parameters and high-precision DGPS.
Key words : WSN， DGPS， RSSI，Monitoring of Pharos