[Gta04-owner] GTA04 hardware suggestion and discussions: GPS

Dr. H. Nikolaus Schaller hns at goldelico.com
Mon Feb 7 18:11:30 CET 2011


Am 05.02.2011 um 10:15 schrieb Glenn Moeller-Holst:

> Here is some GPS suggestion for discussion:
> 
> 
> BCM4750 datasheet:
> http://www.datasheetpro.com/595932_view_BCM4750_datasheet.html
> http://www.datasheetpro.com/595932_download_BCM4750_datasheet.html
> Quote: "...
> Real-time hardware correlator engine (fast acquisition and high-sensitivity) capable of tracking 24 satellites simultaneously
> ...
> High-sensitivity, -157-dBm assisted acquisition sensitivity (with coarse time assistance) and -162-dBm tracking sensitivity, enabling indoor and deep urban operation
> ...
> Autonomous cold start TTFF 30 s
> ..."
> 
> 
> Broadcom - VoIP Android Tablet Support:
> http://www.thesearethedroids.com/2010/02/09/broadcom-voip-android-tablet-support/
> Quote: "...
> As part of the Mobile World Congress demonstrations next week,
> Broadcom is also showcasing Android support across a range of other
> solutions including:
> ...
> Multi-chip Android support in a consumer multimedia tablet device
> based on the BCM11211 VoIP processor and leverages the BCM1181 for
> multimedia processing, the BCM4329 for Bluetooth and Wi-Fi, and the
> *BCM4750* for GPS.
> ..."

I am not sure if these are modules or bare chips (which need some
more external peripherals). The best for us is to use a complete
module where you just connect to power, UART and antenna.

> 
> 
> -
> 
> Wi2Wi:
> http://www.wi2wi.com/navigation.php
> 
> Quote: "...
> W2SG0006
> ...
> -20 Channel, L1 Code
> ...
> Acquisition Time (TTFF)
> - Hot Start TTFF @ -136 dBm: 0.6 sec
> - Hot Start TTFF @ -141 dBm: 0.9 sec
> - Hot Start TTFF @ -146 dBm: 1.9 sec
> - Cold Start TTFF at -136 dBm: 32.6 sec
> - Reacquisition @ - 136 dBm: 100 msec
> Receiver Sensitivity
> - Minimum Acquisition Signal: -142 dBm
> - Minimum Tracking Signal: -157 dBm
> ..."

That one is too big to fit into the space.

> 
> Quote: "...
> W2SG0084
> ...
> 48 Channel GPS Receiver Module Solution
> ...
> - High sensitivity navigation engine (PVT) tracks as low as -163dBm
> ...
> - Active Jammer Remover:
> - Removes in-band jammers up to 80 dB-Hz
> - Tracks up to 8 CW jammers
> ...
> - Aquisition Time
> Hot Start TTFF @ -136 dBm: 0.6 sec
> - Reciever Sensitivy
> Min. Acquisition Signal: -153 dBm
> ..."

The current design uses the W2SG0004 and the 0084 appears
to be pin and software compatible. So we will be able to upgrade
later when they become available (currently no stock @AVNET
EXPRESS).

Please keep an eye on it...

BR,
Nikolaus





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