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On the use of GNSS for Automatic Detection of Attenuating Environments

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Document pages: 7 pages

Abstract: When different radio applications share the same spectrum, the separation byattenuating material is a way to mitigate potential interference. The indoorrestriction for WLAN devices in 5150-5350 MHz is an example for a regulatorymeasure that aims at having WLAN devices operating in an environment thatprovides sufficient attenuation to enable sharing with other services. In thispaper we investigate whether an attenuating environment can be automaticallydetected without user interaction. Instead of detecting an indoor location, weare directly looking for a detection of an attenuating environment. The basicidea is that signals from global navigation satellite services (GNSS) can bereceived practically everywhere on earth where there is a view to the sky.Where these signals are attenuated, the receiving device is assumed to be in anattenuating environment. In order to characterize such environment, we evaluatethe detectable GNSS satellites and their carrier-to-noise density. Examplemeasurements show that GNSS raw data can help to distinguish betweenlow-attenuating locations and higher-attenuating locations. These measurementswere conducted with GNSS receiver in an off-the-shelf Android tablet in orderto show the feasibility of the approach.

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