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| gpspassion |
Posted - 12 janv. 2007 : 15:13:28
Test details below
Since this topic has come up a few times, here is thread where we can discuss the systems offering high refresh rates (the "standard" is 1hz or 1/s) and what type of applications they can be used for.
Systems :
- uBlox based : 4Hz - no consumer system
- MTK based : 5Hz (optional) - iBlue 737 Bluetooth (special version)
- Garmin : GPS18 USB GPSr
Applications :
Probably not much point in having more than 1Hz for road guidance, but typically high refresh rates would be useful to measure acceleration or to improve accuracy (by averaging) for precision use like surveying of farming possibly.
Measurements :
1. Side by side testing of 1Hz and 5Hz systems, see below |
| 15 L A T E S T R E P L I E S (Newest First) |
| cyrill |
Posted - 19 mai 2013 : 09:25:12
hello,
i would find a configurable bluetooth receiver in 5hz but also that it remains even after the extinction as iblue747A +
some one can find the iBlue 747A +?
receiver like GlobalSat, PhotoMate, Royaltek remains stay 5hz even after the extinction?
I saw Holux 1000 that was not bad but a it returns a 1Hz when the shutdown ..
if someone could advise me that would be nice ...
the purpose being on the laptiming and phases aceeleration
thank you in advance for your answers |
| johny_r |
Posted - 20 juin 2009 : 13:43:55
Hello,
I need help with my Qstarz bt-q1000x receiver. I would like to use the 5Hz refresh rate for improved sensitivity to particularly in geocaching, when the direction changes quickly, but it seems that my PDA (iPAQ 214) is not fast enough to process the data and send it to the software. In 5Hz setting (fix refresh rate set to 5Hz) it behaves strangely.
I also have a possibility to set some NMEA sentences and their refresh rates but I am confused about the optimal setting. Could you help?
I can set:
GLL, RMC, VTG, GSA, GSV, GGA, ZDA and MCHN. In default, only RMC, GSA, GSV and GGA are set to 1Hz, the rest is off. What is the optimal setting? I am also not quite shure what the "Fix Update Rate" does. I think it is the refresh rate but why are there ale the sentences that may be set individually. Please help.
Thanks very much... |
| ZeroCool |
Posted - 23 sept. 2008 : 21:55:56
thanks for the links.
i'll keep it in mind - in case it won't work with the GPS18 |
| gpspassion |
Posted - 23 sept. 2008 : 21:35:15
For the GPS18 or for an MTK receiver, for the latter Semsons' iTrek could do the trick http://www.semsons.com/im7blgpsre51.html - you could check with them if there is a way to turn off Bluetooth, I doubt it actually, might be possible on MTK receivers with a logger, maybe on this one http://www.semsons.com/i747bldalogp.html |
| ZeroCool |
Posted - 23 sept. 2008 : 19:19:52
Thanks...i'll give it a try ;)
Just need to get a good price for it... :D |
| gpspassion |
Posted - 23 sept. 2008 : 13:35:23
Sounds good, keep us posted. If the GPS18 doesn't work out, you can always try a MTK Bluetooth receiver in USB mode, the Bluetooth module would normally stop being active so it shouldn't interfere with your engine, if Bluetooth did in the first place. |
| ZeroCool |
Posted - 23 sept. 2008 : 08:52:03
Oh - my mistake. I saw on the first page of this topic that you listed the Garmin so i thought you've tested it.
we don't need a logger. We'll have a slim-pc with our software on it ... and our software is the logger.
After the race we'll get the information from the pc over W-Lan and can analyse the racetrack while they're driving again.
So i thought that the Garmin is the best for our needs. I think we're going to test it and i will post my experience with it. |
| gpspassion |
Posted - 23 sept. 2008 : 00:46:00
No actually I've never used one, seems complicated too as it doesn't have a logger built in. Why don't use use an MTK with a logger and set it to log at 5Hz -> http://www.gpspassion.com/FORUMSEN/topic.asp?TOPIC_ID=91761 ? |
| ZeroCool |
Posted - 22 sept. 2008 : 23:06:57
We need a 5Hz Receiver for our Racetrack Analysis Tool which we programmed.
Bluetooth-Receiver is no Solution because we're going to place the Receiver in a race car and there could be problems with the Engine!
So we decided that the Garmin GPS18 is the best solution!
@gpspassion...
you've tested it ... do you have an further information about the Garmin GPS18?
Thanks! |
| Mike1024 |
Posted - 16 sept. 2008 : 16:17:39
quote:
Originally posted by gpspassion
I think the maximum "actual" rate on a uBlox chipset is 4hz, it might be configurable up to 10Hz but it's going to be using some averaging.
My u-Blox LEA-4T can output raw data (pseudorange/carrier phase/doppler) at up to 10Hz; but the processor in the LEA-4T only has the power to calculate a navigation solution (longitude/latitude) at up to 5Hz.
Needless to say, they could run the chip at twice the clock rate and have the throughput for 10Hz navigation, but that could double the power consumption, or more (see http://en.wikipedia.org/w/index.php?title=SpeedStep&oldid=238208480#Explanation) which needless to say is undesirable. There might be room to double their firmware's performance by more efficient coding but as it's closed source, that's unknown.
You can achieve 10Hz performance by offloading the computations from the u-blox chip to something faster and more powerful, be it another embedded CPU with higher performance, or a PC. I don't know if the Wintec WBT-300 does this, or if they have misunderstood the 10Hz sample rate, or if they have some other way of getting higher performance out of it. |
| gpspassion |
Posted - 16 sept. 2008 : 11:59:49
All GPS sytems output NMEA, it's the standard.
@igalan - not that I know of, no, some people have said that Garmin Mobile XT does, I haven't been able to verify that. Honestly for road use 1Hz is fine, 5Hz is only useful for dynamic applications like those described by some users in this topic; |
| ZeroCool |
Posted - 16 sept. 2008 : 11:38:22
@gpspassion...
Are the mtk based also nmea?
Thx |
| igalan |
Posted - 16 sept. 2008 : 11:36:05
GPSPassion, do you know if modern navigation software does benefit from those GPS with >1Hz? TeleAtlas McGuider 2008 or Nav'n'GO iGO8? |
| gpspassion |
Posted - 16 sept. 2008 : 11:25:17
Not really, I'd say the MTK based receivers are still the best bet in terms of ease of configuration and performance. |
| ZeroCool |
Posted - 15 sept. 2008 : 23:13:59
have things changed here?
what GPS-Receiver with an refresh rate >1Hz would you recommend to buy?
we had a 1Hz receiver and now want to try 5Hz or > ... it should be a NMEA-0183 Receiver...that we can use our software.
Thanks :) |
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