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Transactions of the Chinese Society for Agricultural Machinery
2019
(4)
221-227+373
森林BDS/GPS组合定位算法与精度分析
作 者：
闫飞;王春博;吴永睿;林奕成;冯仲科
单 位：
北京林业大学精准林业北京市重点实验室
关键词：
森林定位导航;北斗卫星导航系统;组合定位;精度分析
摘 要：
针对在森林资源调查和监测中需要实现高精度定位和导航的问题,在鹫峰国家森林公园选择以栓皮栎为主要树种的实验区,采用三鼎T-23型多频三星接收机和u-blox NEO-M8T多星座接收模块,对林下观测点进行定位观测,通过系统间时空统一并采用合理的观测值定权方法,利用BDS和GPS观测数据,建立森林BDS/GPS组合定位算法,将算法写入RTKLIB软件,实现森林观测点三维坐标解算(WGS-84坐标系),最后与单一GPS定位结果进行对比分析。实验结果表明,森林BDS/GPS组合定位卫星可见数为15～23颗,远高于单一GPS定位卫星可见数11颗; BDS/GPS组合定位PDOP值介于0. 5～1. 8之间,小于单一GPS定位PDOP值,二者变化趋势较为相近; BDS/GPS组合定位与GPS定位卫星信噪比均为10～50 d B,但由于BDS/GPS组合定位卫星可见数较多,其卫星信号更强,信噪比更为稳定。BDS/GPS组合定位结果在X、Y、Z方向的理论精度分别为2. 603、3. 302、3. 125 m,单一GPS定位结果分别为2. 382、4. 669、4. 344 m; BDS/GPS组合定位结果在X、Y、Z方向的实际精度分别为3. 112、3. 542、4. 073 m,单一GPS定位结果分别为4. 946、5. 254、7. 274 m。
译 名：
Algorithm Implementation and Precision Analysis of Forest BDS/GPS Combined Positioning
作 者：
YAN Fei;WANG Chunbo;WU Yongrui;LIN Yicheng;FENG Zhongke;Beijing Key Laboratory of Precision Forestry,Beijing Forestry University;Hebei Province Bureau of Coal Geology Geological Team;
关键词：
forest positioning navigation;;BDS;;combined positioning;;precision analysis
摘 要：
In view of the need to achieve high-precision positioning and navigation in forest resources investigation and monitoring,taking the experimental area with cork ridge as main tree species in the Jiufeng National Forest Park,and the Sanding T-23 multi-frequency Samsung receiver and u-blox NEOM8 T multi-receiving modules to carry out a four-hour positioning observation on the observation points in the forest,and the forest BDS/GPS combined positioning algorithm was established by using BDS and GPS observation data through unifying time and space between systems as well as reasonable observation weights. Afterwards,the algorithm was put into the RTKLIB software to realize three-dimensional coordinate calculation of forest observation points( WGS-84 coordinate system),and finally the results were compared and analyzed with single GPS positioning results. The experimental results showed that the visible digits of forest BDS/GPS combined positioning satellites was 15 ～ 23,which was much higher than the visible digits of single GPS positioning satellites( the number was 11). The BDS/GPS combined positioning PDOP value was between 0. 5 and 1. 8,which was lower than that of the single GPS positioning PDOP value,but the changing trend was relatively similar. The SNR values of BDS/GPS combined positioning and GPS positioning satellite were both 10 ～ 50 dB. However,due to the more visible digits of BDS/GPS combined positioning satellites,the satellite signal was stronger and the SNR value was more stable. The theoretical accuracy of the BDS/GPS combined positioning results in the X,Y and Z directions respectively were 2. 603 m,3. 302 m and 3. 125 m,and the theoretical accuracy of the single GPS positioning results in the X,Y and Z directions were 2. 382 m,4. 669 m and 4. 344 m. The actual accuracy of BDS/GPS combined positioning results in X,Y and Z directions were 3. 112 m,3. 542 m and 4. 073 m,and in terms of the single GPS positioning result,it turned out to be 4. 946 m,5. 254 m and 7. 274 m.
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