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ADEUNIS RF - SIGFOX EUROPE demonstrator - USER GUIDE V1.1

APPENDIX 1: GPS Management

When the power is switched on, the GPS carries out a "cold" start-up. The initial phase lasting a maximum of 8 minutes, may appear long

but is essential so that the GPS module can acquire and update its almanac and ephemeris data.

Once the GPS has acquired its data it sleeps in order to optimise energy consumption. Subsequently, the GPS wakes up for 14s every

minute to refresh its position. If the GPS acquires sufficient satellite data during its initial phase, it should be able to resynchronise within

these 14s. However, depending on the conditions of use, this is not always the case. It may be therefore, that certain frames contain no GPS

coordinates.

IMPORTANT:

When the GPS has not been used for a period of time (several days), or when it has been taken switched off over long distances (from one

town to another or from one country to another), the satellite data the GPS previously acquired will be completely wrong. In this case, the

GPS will have difficulty in synchronising. It will not be abnormal therefore for the GPS to take several minutes (>5 min) to resynchronise

during the initial phase.

It is also possible to disable the GPS if this feature is not required.

Initial GPS synchronisation phase

GPS periodic refreshment

GPS wake up and seek

SIGFOX message transmission

Reception window

OOB frame transmission + end of cycle

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