Geolocation Technologies Suitable to Meet Regulatory Requirements for TV White Spaces. Authors:. Abstract
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This tutorial is to be presented during the IEEE 802 Plenary session on July 2011 in San Francisco. It gives an introduction to the accuracy requirements for geolocation in TV White Space and an overview of geolocation techniques that can be used for this purpose.
Notice: This Document has been prepared to assist the IEEE P802.22. It is offered as a basis for discussion and is not binding on the contributing individual(s) or organization(s). The material in this document is subject to change in form and content after further study. The contributor(s) reserve(s) the right to add, amend or withdraw material contained herein.
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15.711 (b) Geo-location and database access requirements. (Page 65)
(1) The geographic coordinates of a fixed TVBD shall be determined to an accuracy of+/- 50 metersby either an incorporated geo-location capability or a professional installer. In the case of professional installation, the party who registers the fixed TVBD in the database will be responsible for assuring the accuracy of the entered coordinates. The geographic coordinates of a fixed TVBD shall be determined at the time of installation and first activation from a power-off condition, and this information may be stored internally in the TVBD.
(2) A Mode II personal/portable device shall incorporate a geo-location capability to determine its geographic coordinates to an accuracy of+/- 50 meters. A Mode II device must also re-establish its position each time it is activated from a power-off condition and use its geo-location capability to check its location at least once every 60 seconds while in operation, except while in sleep mode, i.e., in a mode in which the device is inactive but is not powered-down.
(4) All geographic coordinates shall be referenced to the North American Datum of 1983 (NAD 83).
FCC MO&O 97-402, “Revision of the Commission Rules To Ensure Compatibility with Enhanced 911 Emergency Calling Systems”
FCC 11-107, Third Report and Order, Second Further Notice of Proposed Rulemaking and Notice of Proposed Rulemaking
FCC E911 phase 2 accuracy requirements by Sept 11, 2012.
To be sunset in 2019.
Geolocation accuracy vs fine ranging accuracy
Assuming that the geometry degradation amplification is 2X (on average), the required ranging accuracy is +/- 25 meters.
T1= time of transmission
T2= time of reception
T4= time of reception
T3= time of transmission
Signal flight time= 1/2 * ((T4 - T1) - (T3 - T2))