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 [TOPIC] GlobalSat BU-353-4 with SiRFstarIV

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T O P I C    R E V I E W
musky Posted - 03 mai 2012 : 13:52:20
I've been eagerly awaiting the arrival of the new BU-353-4 with the SirfIV, and finally got it in. What in the world did they do to the bearing algorithm!!! Appears that there is a very long filter on the bearing. Walk slowly. Position changes slowly. Bearing has no relation at all to the track until 10 seconds have gone by. Then reverse direction suddenly. Bearing SLOWLY gets around to changing 180 degrees. It's like there's a huge filter on the bearing. Don't understand why manufacturers take products that work (BU-353 has always been my fav) and then screw it up. I guess the expression should be "If it ain't broke, break it"
7   L A T E S T    R E P L I E S    (Newest First)
ermanwar Posted - 20 déc. 2012 : 19:29:14
Thank you Marvin.I have already reset my gps to the factory settings but it didnt work.after that i pluged in the other gps and set it the sirf mode and then set it back NMEA mode without any im familiar about the settings but i really didint understand what the problem could be.i would like to share the image of gpsinfo can i add an image?
Marvin Hlavac Posted - 19 déc. 2012 : 13:15:51
Hi Ermanwar, and welcome to the forum. You could try to use the software that accompanied the BU353 to perform a reset to factory settings. (Also simply not using the unit for several days should reset it.)
ermanwar Posted - 19 déc. 2012 : 13:03:47
hello.there is a problem with my usb gps.i use globalsat was working all the time since i get it but one day the position info is gone.i use it with gps info application on my laptop.gps info shows me just one satellite (29).but no fix position.gps working but no fix position.i use the appropriate friends usb gps works on my laptop and with the same settings.can you help me with this problem.thank you
musky Posted - 06 mai 2012 : 17:01:48
I just checked for static navigation with SirfDemo. It's not on. Dang. Firmware version is: GSD4e_4.04-P1_RPATCH.07-GS008-F-GPS-4R-1201128 01/12/2012 012
gpspassion Posted - 04 mai 2012 : 15:02:20
Well it's always the same "story", they work with lower quality signals for increased sensitivity so something has to give, bearing in this case apparently, it's not like they were using the entire correlation power of SiRFstarIII anyway. On the other hand if the raw position is correct (but they why would the bearing be off?) it could be a bug. Let us know how your planned fix works out.
musky Posted - 03 mai 2012 : 14:35:30
I'm well familiar with SN, having struggled with this with MTK units. This is not really what I would call SN (Static Navigation). Position is not frozen. Bearing isn't really frozen either, it's just really, really slow to respond. I will try looking into your suggestion; perhaps Sirf is using the SN setting to control the bearing algorithm, although I kind of doubt it.

The BU-353(S3) is a really nice unit. No SN, fast lock, sensitive, etc. I just got the BU-353-S4 for the even better sensitivity and time-to-fix. Not sure why they had to go change the bearing filtering. Oh well, I'm going to calc the bearing myself based on last coordinates. That way I have control over the filtering. A 3-5 second weighted average is looking pretty good.
Marvin Hlavac Posted - 03 mai 2012 : 14:14:34
Hi Masky, see if the following helps:

Look for "Static Navigation" in that page.

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