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    • Gareth Kitchen's avatar
      lisa: gps: Localise NTP to improve GPS TTFF · 14aa4047
      Gareth Kitchen authored
      Testing response times to time.android.com from around the globe reveals
      in ms:-
      
      Europe			 <30
      Middle East		 <68
      North America		<150
      Johannesburg		 183
      Buenos Aires		 220
      Tokyo			 226
      Sydney			 276
      Hong Kong		 285
      Brisbane		 295
      Mumbai			 349
      Beijing			4691
      Shanghai		4906
      Russia			 n/a
      
      Whilst time.android.com is NOT used for GPS NTP, North American time servers
      are, by specifying north-america.pool.ntp.org as default in the framework,
      to align with pixel devices.  I am assuming similar response times to these
      servers from around the world.
      
      Great for North America and it appears Europe but it does not address the
      global issue. Also, the pool.ntp.org project forbids both hardware and
      software vendors from using these default zone names.
      http://www.pool.ntp.org/en/vendors.html
      
      
      
      It makes sense, therefore, to leverage the ntp.org's existing 'android' vendor
      name to make the default ntp server for GPS purposes:
      1.android.pool.ntp.org this will return a random but accurate NTP server in
      close geopraphic proximity to the device.
      
      Testing on my own build in the UK seems to improve hot and cold TTFF
      considerably.
      
      Change-Id: I144af45757efa35b32daf034eece6e046d2bde79
      Signed-off-by: default avatarChenyang Zhong <zhongcy95@gmail.com>
      14aa4047
    • Kevin Tang's avatar
      lisa: gps: move geoidal separation calculation to AP · 50020329
      Kevin Tang authored
      
      add getGeoidalSeparation in LocApiBase
      
      Change-Id: If0ee3660b515adb48302d3ae033d73d5ed8f405d
      CRs-Fixed: 3062671
      Signed-off-by: default avatarChenyang Zhong <zhongcy95@gmail.com>
      50020329
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