High-Accuracy Localization Platform Using Asynchronous Time Difference of Arrival Technology

• Published in: IEEE transactions on instrumentation and measurement Vol. 66; no. 7; pp. 1728 - 1742
• Main Authors: He, Shuai, Dong, Xiaodai
• Format: Journal Article
• Language: English
• Published: New York IEEE 01.07.2017; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Accuracy; Anchors; Asynchronous localization system implementation; Clock synchronization; Computer simulation; Distance measurement; energy detection; error source analysis; Hardware; Identification methods; Indoor environments; Localization; Nodes; Noise propagation; Oscilloscopes; Prototypes; Receiving antennas; Subsystems; Synchronization; Thermal noise; transceiver; ultrawideband (UWB) ranging and location
• ISSN: 0018-9456; 1557-9662
• DOI: 10.1109/TIM.2017.2666278

Despite extensive research efforts on ranging and localization modeling and simulation, research on practical implementations is limited. For the first time, a complete prototype based on asynchronous time difference of arrival (A-TDOA) technique is implemented in hardware. The A-TDOA technique requires neither clock synchronization between a target and anchor nodes nor wired infrastructure among anchor nodes, both of which are necessary for time of arrival and TDOA systems, respectively. All subsystems, including transmitter, receiver, antenna, and baseband processing unit, are developed from scratch and undergone significant updates for improved reliability. The implemented system has been extensively tested in an outdoor and indoor line of sight radio environments, and the accuracies obtained are 20.7 and 15.2 cm in 8 m × 8 m and 6 m × 6 m areas, respectively. In nonline of sight indoor environment, the achieved accuracy is 21.3 cm in 5 m × 5 m area. The comparison with the literature published to date proves the excellent quality of these results. To better understand the localization accuracy, the error sources due to thermal noise, hardware limitation, and radio propagation channel are identified and investigated. Mitigation methods are proposed to reduce errors. The implemented prototype supports many unique applications including cargo tracking, tourist guiding, emergency evacuation, and so on.