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Author Topic: Race Track function accuracy  (Read 3465 times)
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Macdaddy
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« on: July 26, 2009, 11:24:31 pm »

Hi guys,
o.k., I've been avoiding apple products since my first encounter with a macintosh some 25 years ago, but now that DashCommand is an iphone app, my resistance is crumbling fast.  I've been window shopping some other software for a race track like function, and get the impression that a GPS update rate around 10Hz is highly desirable for accurate track information.  As I type this I see it may be more of an Apple question but what do you guys know about this?

Went to the iphone site - no useable information.

Next question, does the dashcommand race track function use the iphone assisted GPS only?  Can it use an external GPS via bluetooth?  That would allow someone to use the 10Hz GPS update rate.
thanks,
Mac
« Last Edit: July 26, 2009, 11:31:00 pm by Macdaddy » Logged

Kvaser Leaf HS
BrianP
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« Reply #1 on: July 27, 2009, 02:37:05 pm »

DashCommand does use the iPhone's assisted GPS only - it does not (yet) support any external GPS devices, although we are open to adding support for them. From my experience, the iPhone can do only about a 3Hz GPS update rate on a good day.

BTW - which GPS receiver are you using that can do 10Hz? We may want to add support for it to our Windows version of DashCommand.
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Macdaddy
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« Reply #2 on: July 27, 2009, 10:45:02 pm »

BTW - which GPS receiver are you using that can do 10Hz? We may want to add support for it to our Windows version of DashCommand.

Brian, I was talking off the top of my head and not with parts in hand unfortuantely. 

The lads in the shop have the race_logic v box w/gps but for some reason the data never migrates out of the blue box.  v box starts at 5hz and goes up (10, 20, 100 hz) with $$ in exponetial proportions.

I was thinking of one of these:http://www.maxqdata.com/PocketPCSoftware.htm but I just don't want to add a pocket pc to the inventory.   Their base system has a 5 hz update rate, my apologies, I though it was 10 hz.

this unit claims to be 10Hz
http://www.buygpsnow.com/wintec-g-rays-i-wbt-300-dual-usb-bluetooth-gps-receiver-auto-on-off-waas-user-configurable-1-10-hz-free-vent-mount-834.aspx

I think that's what got me hung up on 10Hz.

other 5 Hz units:
http://www.buygpsnow.com/Q818x_Bluetooth_GPS_Receiver.aspx
http://www.buygpsnow.com/qstarz_btq1000x_gps_data_logger.aspx
http://www.buygpsnow.com/GlobalTop-HG-100-HUD-Bluetooth-GPS-Receiver-w-Speed-Meter-(51ch-MTK--5Hz--WAAS)-(Your-Choice-of-Free-Mount)__931.aspx

I have no real world experience with any of them-they may be worthless.  I think all are 1 hz by default but have some user means to speed up the update rate.

A useful system would be one of those 5 to 10 hz bluetooth units with your system on a netbook.  Been wanting to buy a netbook but haven't got the justification list long enough yet.  port your program to windows and I may have to spend the bucks.

one thing the q data software does that is interesting is to overlay the longitudinal and lateral accelerations over the spatial data.  It appears to make visual interpretation of the data easier.  Not sure how that translates to actual use however.

Have a meeting tomorrow with some (other) testers this kinda thing would come in handy.  (actually, a system with two bluetooth GPS units would be sweet!  and a nice alternative to what we have (nothing) - hard to ask someone to drop big money on a v box in this economic climate.

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Kvaser Leaf HS
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