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Copyright of Journal of Agricultural Resources & Environment / Nongye Ziyuan yu Huanjing Xuebao is the property of Journal of Agricultural Resources & Environment Editorial Board and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Telecommunication Engineering is the property of Telecommunication Engineering and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

In view of the high price of current measurement tools and the method of manual acquisition, an unmanned aerial vehicle autonomous navigation measurement system based on the combination of Mission Planner open source ground station and GNSS is designed. The system consists of a quadrotor UAV, an APM controller, a Mission Planner ground station and a post-PPK differential system. Two control modes of manual and automatic navigation are designed. In the automatic navigation mode, the map module and data interaction module of the Mission Planner ground measurement and control system can be used to realize the flight of the UAV in accordance with the designed preset route and obtain the three-dimensional coordinates of the target points. Through the positioning test of GNSS-BDS/GPS system and the comparison test of automatic navigation, it is concluded that the positioning accuracy of this automatic measurement system can reach centimeter level in static state, and the positioning accuracy can reach decimeter level in automatic navigation mode. Finally, it is applied to the point position coordinate measurement, and the error of the measured data is controlled within 10cm, which meets the basic requirements of the measurement work. This paper can provide theoretical basis and practical reference for the research and development of fully autonomous measurement technology equipment in the future. [ABSTRACT FROM AUTHOR]

Copyright of Geomatics & Information Science of Wuhan University is the property of Geomatics & Information Science of Wuhan University and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Journal on Communication / Tongxin Xuebao is the property of Journal on Communications Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)