Adaptable tracking with respect to accuracy - energy - robustness

在BATS的第一阶段，跟踪功能由TP5和TP6开发。设计了一种跟踪概念，它提供基于场强的低能量跟踪，覆盖传感器网络的整个区域- Tracking4BATS （TP5）的焦点-并在有限区域内提高精度，基于相位相干测量- Scalability4BATS （TP6）的焦点。必须强调与弗劳恩霍夫研究所的密切合作。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。鲁棒性4bats，这个项目的应用，必须克服计算轨迹可靠性的限制。限制是由于多路径传播，正如在巴拿马的现场试验中所观察到的那样。必须检测、减轻多路径传播，并最好利用多路径传播，例如，通过使用多路径依赖指纹来增强数据库，以便更好地定位。第一阶段的两个设计标准，能耗和精度，必须由第三个标准：稳健性来完成。传感器数据融合必须在这些相互冲突的目标之间实现用户驱动的平衡。必须设计质量指标来表征能量消耗、准确性和多径传播。为了测量信道的频率响应，必须将双音信号的概念推广到多音信号。新的信号设计必须有利于发射信号的环境适应性谱功率密度：对于视距传播精度应最大化，在多径传播情况下具有鲁棒性。这种适应性是GPS等全球导航卫星系统尚未研究的目标。它是目标科学成果的核心。不仅包括同步多音信号，还包括跳频信号，因为商用低能量收发器使用这种信号。为了解决这些问题，包括天线在内的基站必须在弗劳恩霍夫IIS的支持下进行修改。

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.