[time-nuts] Homemade GPS Receiver
jimlux at earthlink.net
Mon Sep 29 08:44:07 EDT 2014
On 9/28/14, 10:09 PM, Peter Monta wrote:
>> How hard is the beam steering relative to everything else?
> It's a weighted sum of the antenna signals (as with any phased array), so
> the cost is the extra arithmetic to do this (on a per-satellite basis).
> The weights can be computed open-loop from the positions of the satellites,
> provided you're interested only in gain and not antijam performance. The
> multiple antenna elements, downconverters, and ADCs add to the expense
> somewhat, of course.
Since many GPS receivers use a single bit quantizer with direct
conversion, the front end can be pretty simple.
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