r8 - 2012-07-24 - 05:51:57 - DavidTaylorYou are here: NTP >  Support Web > InexpensiveOemGps
NTF needs your help to qualify to participate in the Combined Federal Campaign so we can continue our mission to improve Network Time. We only need a few thousand dollars more by December 31st - any sized donation helps! Please join an NTF Consortium or make a donation to NTF now! THANKS!

Inexpensive OEM GPS Receivers

With PPS

Garmin GPS-18LVC

Sure Electronics GPS Evaluation board

Without PPS

Globalsat BR-355, BU-353 and other modules using the SiRF chip sets.

These don't work very well. They have two problems.

  1. First is that they have a lot of jitter/wander. (The jitter is too low frequency to easily filter out.)
  2. Second is that they have a strange off-by-a-second bug if there is a leap second pending. This graph shows both quirks.
Topic attachments
I Attachment Action Size Date Who Comment
gifgif leap-gps2.gif manage 15.2 K 2008-11-21 - 05:19 HalMurray Plot of Leap Second glitch in SiRF chip sets
Edit | WYSIWYG | Attach | Printable | Raw View | Backlinks: Web, All Webs | History: r8 < r7 < r6 < r5 < r4 | More topic actions
SSL security by CAcert
Get the CAcert Root Certificate
This site is powered by the TWiki collaboration platform
IPv6 Ready
Copyright & 1999-2014 by the contributing authors. All material on this collaboration platform is the property of the contributing authors. Ideas, requests, problems regarding the site? Send feedback