Hệ thống định thời GPS trong nhà Skylight
Hỗ trợ bán hàng
GPS signals are weak and often impractical in urban environments due to limited visibility of the sky, and constraints of roof-top access and long GPS antenna cable runs.
Skylight is a result of Spectracom’s expertise in GPS reception and applications for precision timing. Proprietary algorithms use a combination of high sensitivity receivers, the expanding constellation of various global navigation systems, accurate internal oscillators and assisted GPS to extract the GPS on-time point to sub-microsecond accuracy even in areas with somewhat limited GPS reception.
Skylight does not work everywhere. A signal to noise ratio above about 30 dBc/N0 at the antenna panel is required. Subterranean and other radio-isolated locations will still need to be synchronized using other techniques (such as over a network via a PTP master-slave combination) versus by GPS directly. However, exterior walls or walls across from a window in above ground floors of a building are likely candidates for Skylight. Even urban canyon situations can be considered as neighboring buildings can often redirect signals to the antenna panel that contain useful timing information for the Skylight system. And the signal does not have to be available 24/7. By using a precise stable oscillator and our proprietary disciplining algorithms, Skylight needs the GPS signal for only a few hours a day. Often the RF noise is reduced at night which can allow Skylight to maintain legally traceable time even if signal acquisition is subpar during the day.
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