Adaptable tracking with respect to accuracy - energy - robustness

在最佳可行技术测试系统的第一阶段，跟踪功能由TP 5和TP 6开发。设计了一种跟踪概念，其提供基于场强的低能量跟踪，覆盖传感器网络的整个区域-跟踪4 BATS（TP 5）的焦点-并且基于相位相干测量在有限区域中提高精度-可扩展性4 BATS（TP 6）的焦点。必须强调与Fraunhofer IIS的密切合作。如果没有合作，基站平台（OAK板）和特定定位天线的设计几乎是不可能的。Robustness 4 BATS，这个项目的应用程序，必须克服有关计算轨迹的可靠性的限制。这些限制是由于多径传播，正如在巴拿马的现场试验期间所观察到的那样。多径传播必须被检测、减轻并且优选地被利用，例如通过用多径相关指纹来扩充数据库以用于更好的定位。第一阶段的两个设计标准，能耗和精度，必须由第三个标准来完成：鲁棒性。传感器数据融合必须在这些相互冲突的目标之间提供一种用户驱动的平衡。必须设计质量指标来表征能量消耗、精度和多径传播。双音信号的概念必须扩展到多音信号，以便测量信道的频率响应。新的信号设计必须促进发射信号的环境适应性谱功率密度：在多径传播鲁棒性的情况下，视线传播精度应该最大化。这种适应性是全球导航卫星系统（如GPS）尚未研究的目标。它是科学成果的核心目标。不仅要包括同时多音信号，而且要包括跳频，因为商业低能量收发器应用这种信号。为了解决这些问题，必须在Fraunhofer IIS的支持下修改包括天线在内的基站。

During the first phase of BATS the tracking functionality was developed by TP5 and TP6. A tracking concept was designed, which provides field-strength based low energy tracking covering the complete area of the sensor net - focus of Tracking4BATS (TP5) - and increased accuracy in limited areas, based on phase coherent measurements - focus of Scalability4BATS (TP6). The close cooperation with the Fraunhofer IIS has to be underlined. Without the collaboration the design of the base station platform (OAK board) and the particular positioning antennas would have been hardly possible. Robustness4BATS, this project application, has to overcome limitations regarding the reliability of the computed trajectories. The limitations are due to multipath propagation, as has been observed during the field trial in Panama. Multipath propagation has to be detected, mitigated and preferably exploited, e.g. by augmenting the databases with multipath dependent fingerprints for better positioning. The two design criteria of phase 1, energy consumption and accuracy, have to be completed by a third criterion: robustness. The sensor data fusion has to render possible a user-driven balance among these conflicting goals. Quality indicators have to be devised to characterize the energy consumption, the accuracy and multipath propagation. The concept of two-tone signals has to be extended to multi-tone signals in order to measure the frequency response of the channel. The new signal design has to facilitate an environment-adaptable spectral power density of the transmit signal: for line-of-sight propagation accuracy should be maximized, in the case of multipath propagation robustness. This adaptability is an objective not yet investigated in Global Navigation Satellite Systems like GPS. It is central to the scientific outcome targeted at. Not only simultaneous multi-tone signals, but also frequency hopping shall be included, since commercial low-energy transceivers apply this kind of signals. To address these issues, the base stations including antennas have to be modified with the support of the Fraunhofer IIS.