Talk:GNSS software-defined receiver

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Smartphone

My Samsung M910 Intercept runs down its battery in a few hours when using it as a GPS speedometer instead of just with Google Maps. Is this because, unlike dedicated GPS receivers, smartphones use a power hungry Software Defined Radio for GPS instead of more abstemious dedicated hardware? Jim.henderson (talk) 15:26, 5 March 2012 (UTC)[reply]

No.Fgnievinski (talk) 00:11, 27 June 2014 (UTC)[reply]

Re. legal concerns

Hi, it appears that under an obscure law relating to "ceiling" on GPS decoders it is illegal to use equipment that circumvents or has the capability to circumvent the 15,000 feet restriction. In principle this means that a GNSS software receiver must implement the same restriction by design or be classed under the same category as "scanning receiver" as described in the Terrorism Act 2000. ^[1] This also means that an unauthorized software modification on existing equipment can also fall foul of the same law if it removes restrictions on frequency coverage in addition to voiding the CE certification if present.

If memory serves the restriction includes both altitude and velocity.

^ https://gis.stackexchange.com/questions/19811/gps-module-without-velocity-or-altitude-limitations

[1] ttps://gis.stackexchange.com/questions/19811/gps-module-without-velocity-or-altitude-limitations

[1]