TITUS (TDOA Iridium Technique for UTC(NPL) time transfer and Synchronisation)

TITUS项目将在英国上空开发一种新的授时服务，使用来自大量卫星星座的通信信号的被动监测作为机会信号。TITUS项目提出了一个高度创新的概念，该概念基于处理位于不同位置的低成本传感器接收的高功率和可免费获得的铱信号，以及计算台站之间的到达时间差（TDOA）。我们提出的方法提供了进一步提高时间传递精度的前景，超出了实际可用的时间精度，相对于UTC（NPL）达到数十纳秒。

The TITUS project will develop a new timing service over the UK using passive monitoring of communications signals from proliferated satellite mega-constellations as a signal of opportunity. The TITUS project proposes a highly innovative concept based on processing the high power and freely available Iridium signals, which are received at low-cost sensors located at different locations, and the computation of Time Differences of Arrival (TDOA) between the stations. Our proposed approach offers the prospect of further improving the accuracy of time transfer beyond what is actually available targeting time accuracies of tens of nanoseconds with respect to UTC(NPL).