車載移動式測繪系統及直接地理定位控制場之設置

Mobile Mapping System and the Establishment of Control Field for Direct Georeferencing

自慣性導航系統在1980年初被引入民用領域，相關的應用發展便與日俱增，其中移動式測繪系統即是近年來最顯著的整合應用之一。由於移動式測繪系統擁有快速資料採集，以及無需地面控制點即可對目標物進行直接地理定位的特性，因此在空間資訊領域受到莫大的重視。本文提出一車載移動式多元感測器測繪系統進行空間資料蒐集，研究中採用Meinberg GPS170PCI 時鐘卡實現不同感測器與不同資料採集頻率下的資料同步整合，以及利用C-MIGITSIII INS/GPS 系統記錄平台移動之軌跡及姿態。而為了達到直接地理定位的目的，研究中主要以GPS及三邊測量方式建置一個在TWD97 框架下的高精度控制場，以便未來應用於系統率定及定位精度檢核。文中將介紹所提出的車載移動式測繪系統之軟硬體架構，接著說明如何進行高精度控制場之測量，進而評估此控制場在移動式測繪系統應用之可行性。經誤差傳播推導顯示控制場部分擁有5cm的先驗精度，預期未來在系統率定後將達到有高精度直接地理定位之能力。 Since the inertial navigation system (INS) was introduced in civil applications, itsdevelopment has gained more and more attention in geomatics communities. In which, the mobilemapping system (MMS) is the most significant one because of its abilities in directgeo-referencing and rapid data acquisition. In the paper, a multi-sensor land-based MMS forgeospatial information collection is proposed. In addition, the Meinberg GPS170PCI timing boardis used to synchronize the measurements from various sensors onboard. In the meantime, theC-MIGITSIII INS/GPS system is used for recording the vehicle’s trajectory and orientation.For the purpose of direct geo-referencing, a high-accuracy ground control field under TWD97coordinate system was established by means of GPS and trilateration survey. The control field willbe applied for MMS system calibration and positioning error analysis in the future. This paper will introduce the configuration of the proposed MMS in the beginning. Then, we will describe themethodology of creating a high-accuracy control field and evaluate its applicability in MMS. Thepreliminary results presented in this study depict that an absolute accuracy of 5 cm could beachieved for the control field and the stability of the proposed MMS is high, thus we believe that ahigh-accuracy of direct geo-referencing capability is possible after system calibration in thefuture.

Since the inertial navigation system (INS) was introduced in civil applications, itsdevelopment has gained more and more attention in geomatics communities. In which, the mobilemapping system (MMS) is the most significant one because of its abilities in directgeo-referencing and rapid data acquisition. In the paper, a multi-sensor land-based MMS forgeospatial information collection is proposed. In addition, the Meinberg GPS170PCI timing boardis used to synchronize the measurements from various sensors onboard. In the meantime, theC-MIGITSIII INS/GPS system is used for recording the vehicle’s trajectory and orientation.For the purpose of direct geo-referencing, a high-accuracy ground control field under TWD97coordinate system was established by means of GPS and trilateration survey. The control field willbe applied for MMS system calibration and positioning error analysis in the future. This paper will introduce the configuration of the proposed MMS in the beginning. Then, we will describe themethodology of creating a high-accuracy control field and evaluate its applicability in MMS. Thepreliminary results presented in this study depict that an absolute accuracy of 5 cm could beachieved for the control field and the stability of the proposed MMS is high, thus we believe that ahigh-accuracy of direct geo-referencing capability is possible after system calibration in thefuture.