Difference between revisions of "GPS"

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As of today (March 2008) the two best GPS chipsets available are the SiRF Star III and MTK MT3318. They offer fast initial fix and can utilize weak GPS signals by massive parallel correlation computing power [http://gpstekreviews.com/?p=19].
As of March 2008 the two best GPS chipsets available is the SiRF Star III and MTK MT3318. They offer fast initial fix and can utilize weak GPS signals by massive parallel correlation computing power [http://gpstekreviews.com/?p=19].


== SiRF Star III ==
== Holux GPSlim 240 GR-240==
 
[[Image:Gps holux gpslim 240 unit.png]] [[Image:Gps holux operation.png]]
 
* Chipset: '''SiRF Star III - GSC (single chip)'''
 
This is a very small and light Bluetooth SPP (Serial Port Profile) compatible unit with USB support (USB-to-SERIAL cable). It features massive correlation computer power and excellent sensitivity.
 
The small size makes it idea for internal installation inside the [[Eee PC]]. The small power-switch on the side can accidentally be turned and disturb the operation of the device if it's in the pocket or backpack.
 
'''Note:''' Initially I had problems getting it up and running from a cold start [http://www.aximsite.com/boards/gps-talk/151923-holux-gpslim-240-problem.html]. In HyperTerminal the COM-port was outputting unusable skewed data. After draining the battery (disconnecting the battery) it worked fine, instant lock.
 
=== Disable DGPS ===
 
To disable differential GPS correction, either use the SiRF Demo program [http://www.sirf.com/SiRFDemo.zip] or these commands to disable WAAS/EGNOS/MTSAT [http://www.gpspassion.com/forumsen/topic.asp?TOPIC_ID=60637]:
 
$PSRF100,0,38400,8,1,0*3C ; Switch to SiRF mode
$PSRF151,00*0E ; WAAS/EGNOS/MTSAT Off
$PSRF151,01*0F ; WAAS/EGNOS/MTSAT On


=== SiRF commands ===
=== SiRF commands ===
* [http://www.gpspassion.com/forumsen/topic.asp?TOPIC_ID=60637 NMEA Proprietary Commands (SiRF, NemeriX)]
* [http://www.gpspassion.com/forumsen/topic.asp?TOPIC_ID=60637 NMEA Proprietary Commands (SiRF, NemeriX)]


== MTK MT3318 ==
== Holux M-1200 ==
 
[[Image:Gps holux m-1200 unit.png]] [[Image:Gps holux data cable.png]]
 
* Chipset: '''MTK MT3318'''
 
The M-1200 looks and works much the same as the GPSlim 240. It's based on the latest MT3318 chipset and features 32 channel satellite tracking queue/pipeline, 1 to 5 Hz update frequency, and lower power usage.


=== Enable 5 Hz ==
=== Enable 5 Hz ===


The default update frequency is 1 Hz, or once per second, the MTK chipsets support 5 Hz.
The default update frequency is 1 Hz, or once per second, the MTK chipsets support 5 Hz.


  > $PMTK300,200,0,0,0,0*2F
  $PMTK300,200,0,0,0,0*2F ; Set 200 millisecond update frequency
  > $PMTK251,115200*1F
  $PMTK251,115200*1F ; Baud rate 115200
  > $PMTK300,200,0,0,0,0*2F
  $PMTK300,200,0,0,0,0*2F ; ; Again set update frequency


== Hacks ==
=== Hacks ===
* [http://www.gpspassion.com/forumsen/topic.asp?TOPIC_ID=81990#508553 Enable commands over Bluetooth]
* [http://www.gpspassion.com/forumsen/topic.asp?TOPIC_ID=81990#508553 Enable commands over Bluetooth]


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* [http://homepage2.nifty.com/k8/gps/ NMEA Monitor]
* [http://homepage2.nifty.com/k8/gps/ NMEA Monitor]
* [http://www.transystem.com.tw/pdf_gps/Tool_iGPS-M%20Pro_Rev1.0.3.zip Transystem GPSView]
* [http://www.transystem.com.tw/pdf_gps/Tool_iGPS-M%20Pro_Rev1.0.3.zip Transystem GPSView]
* [http://www.sparkfun.com/datasheets/GPS/MiniGPS_1.32.zip MiniGPS]
* [http://www.sparkfun.com/datasheets/GPS/MiniGPS_1.32.zip MiniGPS] (MTK)
* [http://www.gpspassion.com/forumsen/topic.asp?TOPIC_ID=81990#508614 MTKTweak]
* [http://www.gpspassion.com/forumsen/topic.asp?TOPIC_ID=81990#508614 MTKTweak]
* [http://digitrendy.3hosting.com.hk/Download.htm Holux GPSViewer]
== Navigation Software ==
* [http://www.inavcorp.com/ iNav iGuidance] - Windows - ''American only''
* [http://www.microsoft.com/streets/default.mspx Microsoft Streets & Trips] (America) [http://www.microsoft.com/streets/ProductDetails.aspx?pid=003 AutoRoute] (Europe) - Windows - '''Recommended'''
* [http://www.microsoft.com/mappoint/default.mspx Microsoft Mappoint] - Windows
* [http://shop.delorme.com/OA_HTML/DELibeCCtpSctDspRte.jsp?section=10121 DeLORME Street Atlas] - Windows - ''USA only''
* [http://www8.garmin.com/support/download_details.jsp?id=575 Garmin nRoute] (GPSGate for NMEA-to-Garmin) - Windows - ''Garmin maps only''
* [http://roadnav.sourceforge.net/ Roadnav] - Linux, Windows, Mac OS X - ''USA only''
* [http://www.gpsdrive.de/ GPSDrive] - Linux - '''Recommended'''
* [http://navit.sourceforge.net/ Navit] - Linux
* [http://qlandkarte.sourceforge.net/ QLandkarte] - Garmin Linux
== Utilities ==
* [http://www.gpsbabel.org/ GPSBabel]
* [http://franson.com/gpsgate/ GPSGate]
* [http://www.gpspassion.com/forumsen/topic.asp?TOPIC_ID=24519 AR Keys] (S&T/AutoRoute)


== References ==
== References ==
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* [http://www.egnos-pro.esa.int/IMAGEtech/imagetech_realtime_html.html EGNOS Real Time Performance]
* [http://www.egnos-pro.esa.int/IMAGEtech/imagetech_realtime_html.html EGNOS Real Time Performance]
* [http://www.gpspassion.com/forumsen/topic.asp?TOPIC_ID=81990 Discussing MTK receivers and Tips and Tweaks]
* [http://www.gpspassion.com/forumsen/topic.asp?TOPIC_ID=81990 Discussing MTK receivers and Tips and Tweaks]
* [http://www.pocketgpsworld.com/modules.php?name=FAQ&myfaq=yes&id_cat=1&categories=Basic+GPS+Theory#9 GPS terminology]
* [http://forum.eeeuser.com/viewtopic.php?id=8313 Best software for GPS?]
* [http://thegadgetlink.com/blog/an-up-to-date-list-of-free-gps-software/ Free GPS Software]
* [http://www.aximsite.com/boards/gps-talk/151923-holux-gpslim-240-problem.html GPSlim 240 problem]

Latest revision as of 23:47, 2 April 2008

As of March 2008 the two best GPS chipsets available is the SiRF Star III and MTK MT3318. They offer fast initial fix and can utilize weak GPS signals by massive parallel correlation computing power [1].

Holux GPSlim 240 GR-240

Gps holux gpslim 240 unit.png Gps holux operation.png

  • Chipset: SiRF Star III - GSC (single chip)

This is a very small and light Bluetooth SPP (Serial Port Profile) compatible unit with USB support (USB-to-SERIAL cable). It features massive correlation computer power and excellent sensitivity.

The small size makes it idea for internal installation inside the Eee PC. The small power-switch on the side can accidentally be turned and disturb the operation of the device if it's in the pocket or backpack.

Note: Initially I had problems getting it up and running from a cold start [2]. In HyperTerminal the COM-port was outputting unusable skewed data. After draining the battery (disconnecting the battery) it worked fine, instant lock.

Disable DGPS

To disable differential GPS correction, either use the SiRF Demo program [3] or these commands to disable WAAS/EGNOS/MTSAT [4]: 

$PSRF100,0,38400,8,1,0*3C ; Switch to SiRF mode
$PSRF151,00*0E ; WAAS/EGNOS/MTSAT Off
$PSRF151,01*0F ; WAAS/EGNOS/MTSAT On

SiRF commands

Holux M-1200

Gps holux m-1200 unit.png Gps holux data cable.png

  • Chipset: MTK MT3318

The M-1200 looks and works much the same as the GPSlim 240. It's based on the latest MT3318 chipset and features 32 channel satellite tracking queue/pipeline, 1 to 5 Hz update frequency, and lower power usage.

Enable 5 Hz

The default update frequency is 1 Hz, or once per second, the MTK chipsets support 5 Hz. 

$PMTK300,200,0,0,0,0*2F ; Set 200 millisecond update frequency
$PMTK251,115200*1F ; Baud rate 115200
$PMTK300,200,0,0,0,0*2F ; ; Again set update frequency

Hacks

MTK commands

Other chipset brands

  • SkyTraq
  • Nemerix
  • uBlox
  • uNav
  • Sony
  • Fujitsu

Tools

Navigation Software

Utilities

References

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