[time-nuts] Low SNR GPS reception and cheap LNAs

GandalfG8 at aol.com GandalfG8 at aol.com
Fri Apr 25 12:21:04 EDT 2014

Coincidentally, I came across this earlier today when looking for  some 
MMIC data, perhaps it might be worth a look?...........
In a message dated 25/04/2014 14:28:57 GMT Daylight Time, attila at kinali.ch  


I recently bought a bladeRF[1] to experiment a bit with  GPS decoding.

I tried to get GNSS-SDR[2] which seems quite good, but  has its flaws.
One of the things was that i cannot seem to get a fix in my  environment.
One of the problems seems that my antenna position is far from  optimal.
Aparently, GNSS-SDR uses only a very rudimentary acquisition  technique
(at least so i have been told). Now i wonder what techniques for  low SNR
acquisition are around. Would someone be so kind and give me some  key
words to google for?

I also am looking to add an LNA to my  reception chain, which is a
mix of a 50R antenna with 75R Coaxcable (sat  coax stuff is just a lot
cheaper :-). Has anyone a recomendation for a good  LNA that can be used
in a flying construction (soldering onto two  back-to-back glued 
Ie it shouldnt be a QFN or BGA. DFN works  but i'd rather have something
with pins, like SC-70/SOT-323 or  similar/larger.

Attila  Kinali

[1] www.nuand.com/bladeRF
[2] www.gnss-sdr.org

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