Robert Benward wrote:
Yuri,
Another suggestion would be to look for a low power GPS; I can't image
with all the GPSs out there in all those cell phones, that they all take
40mA or more. If you find one that does have low power, then locate it
at the antenna and then you won't need an active antenna. (canabalize a
cell phone?)
Most cell phones do not have a full GPS receiver in them. They use
various forms of assisted GPS to reduce the nanojoules/fix.
But what about putting a small solar panel next to your antenna. If the
antenna can see GPS, the panel can see the sun (for the most part). A
cheap panel puts out somewhere around 50W/square meter, so that will
give you a starting point. 100mW = 1/500th m^2 = 20 cm^2
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