I'm currently working on a design with a specific problem, which I'm
hoping someone will have come across before.

Essentially I have several remote circuits, which must remain unconnected.
They all need to be synchronised within 100 Micro Seconds.

Essentially we are looking at deploying a beacon transmittor which will
send out a pulse at known intervals and have low power recievers on each
circuit which come out of hibernation at the required interval, to reset
the onboard clocks appropiatly.

We are looking at achieving 100m range (indoors), however power at the
beacons is not a significant problem (we have 11Watts available, and these
are not battery powered). Power at the recievers is crucial, each circuit
is powered by battery and must be capable of running for a minimum period
of a year. Physical battery size is not crucial but small is better :)

Does anyone have any other suggestions how to achieve the required
synchronisation, or can anyone suggest any suitable radio IC's/circuits
which could be used as I am stuggling to find anything useful via google
(must be using the wrong keywords)

Any suggestions or comments would be greatly appreciated.

Mat


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