IoT M2M blog

The home of free hints and tips about wireless IoT / M2M

GSM / GPS tracking in the shoes?

The whole world is constantly trying to publish the smallest GPS tracking device.

This morning a tracking device in the shoe was seen again. Apart from the fact that a shoe is a very inappropriate place for a GPS and GSM antenna, everyone needs more than one pair of shoes. In the bathtub I always pull my shoes off. My grandma has always pulled her shoes when she went to bed. Alzheimer’s patients are so confused that they just go outside with shoes – but sometimes without shoes.

The ubiquitous physics is simply repealed. Water is conductive. The red-coloured water in the foot named blood is simply ignored. That the road through rain and snow is wet sometimes is overlooked as well. That the radio wave only outside the Fresnel zone can “survive” was forgotten. The GPS signal levels are close to the atmospheric noise. By the way, GPS is no longer the centre of the world. When you already rely on GNSS, you should – like the new Motorla Razr Droid – use a combination of GPS and Glonass. Those who wants it better and more accurate take a GPS / GLONASS-module which receives the American GPS and Russian Glonass parallel.

On my new 20 gram tracker only those horrible antennas are left. A battery is no longer needed. This weight we have thrown overboard. Just these two weakening antennas and in addition the ground plane is still left. Mr. Marconi, why did you invent the ground plane? Couldn’t you simply leave out? That’s a pretty kettle of fish! The antennas are larger than the radio modules. Everything shrinks and becomes lighter. The board can be designed as a flex-PCB. The microcontroller is now barely visible. The SIM card is a SIM on chip.

Mr. Marconi had this really be?

http://de.wikipedia.org/wiki/Marconi-Antenne

And who wants to know more this is allowed to send an email to harald.naumann (at) gsm-modem.de.

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