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ThomasScherrer

U-blox and Navilock GPS unit setup codes ?

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I like to know how to change update speed from 1Hz to 4Hz

the hex codes in the manual dont work

and I hate HEX codes, prefer NMEA ascii setup codes !

The modules are SIRF3 so they respond to normal SIRF3 codes like the EM406A

so I can easily change baud rates and nmea codes on /off, that is cool.

also I like to know if there exist an NMEA setup code to change

from Automotive mode to Pedestrian mode ??

the HEX code in the manual dont work.

the Automotive mode uses quite big movement hysteresis to filter all the jitter away,

so it simply dont update the position or height or speed att all,

unless you go and move 3-4 meters,

also I need to see if this GPS is useable att all for model planes, and how bad/ok it really is,

we have seen many different modules out there and also some are really cheap,

but also compleetly useless on a plane, what a shame :-)

The chip set is:

MediaTek MTK3318 High Performance GPS Chip SiRF Star III

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I'm probably not going to be much help since I don't have experience with your particular GPS module. But if the MTK3318 chipset is truly a SiRF star III clone (I recall that MTK and SiRF are fierce competitors) then "pedistrian" mode, which SiRF calls Static Mode Off, may dissappoint you. I often found that the NMEA data was a bit unstable at very slow speeds, especially when travel had stopped. So, I recommend using the Static mode to filter out the jumpy data. Also, I had trouble using NMEA ASCII commands with SiRF Star III modules, so I used binary mode (per the details in the SiRF protocol manual).

BTW, if you can share a link to the MTK3318 data sheet, that might allow someone to offer better help than me.

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I dont have any MTK3318 info sorry,

only this data sheet with non working hex codes,

www.webx.dk/NL_60415_-_Datenblatt_u-blox_GPS_Module_24092007_481.pdf

I need ASCII compatible setup codes, so we dont need to re-write our PC setup software

it stores it all in XML files, and that format only handle readable chars.

The OSD however handle any bytes you can imagine.

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According to the datasheet, it isn't a SiRF Star III chipset based design. It appears to be Atmel ANTARIS SuperSense ATR0635. Have you tried searching the Atmel site for the data you need?

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aha:

http://www.atmel.com/dyn/products/product_...mp;part_id=3932

on the atmel pages I find nothing about the NMEA messages or the controll setup commands

but here I find something:

http://www.u-blox.com/customersupport/ublox5_doc.html

still no solution to my questions, maybe there exist a PC program that can controll those GPS modules into all modes ?

Edited by ThomasScherrer

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Are you sure it's an ublox 5, and not an antaris 4? There is this software at least for the latter: http://www.u-blox.com/products/u_center.html Maybe it supports the 5 series too, but it soesn't seem to be detailed.

The Mikrokopter uses a LEA-4H based module, and they have very good results with it, they manage to have pretty accurate position hold and semi automatic flight with it.

I have 2 modules but not gotten to try them on the aircraft yet. They perform very well when testing normally, very fast acquisition and very little jitter on the readings. That's with all settings as default except for 4Hz output.

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Thanks alot I will DL that program and see if I can change the filter modes and update speed

so I can verify those modules performance,

YES it is AMAZING how fast they get sat lock !

even indoor, first time and sec time, both MUCH faster than EB85 and any other modules I have seen,

as I said those modules respond too all the SIRF codes, and can also run in real SIRF modes,

so programs like SirfDemo works fine, but dont support update speed change.

by the way: can all GPS modules output ZDA codes ?

it seems like not 100% supported by several of the PC SW I have

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