Re: [Paparazzi-devel] Gps Lag ublox lea6s

[Kadir ÇİMENCİ]

Hi Andrew,

I can't find any information about delays on datasheet. And i don't look at the timestamps, in fact i wasn't aware of there are timestamps with Gps data,at least for ublox lea 6s until you said this. I make the tests by walking with my laptop in my hand, and the paparazzi on another hand by watching the speed and position graphs with sudden stops and movements :). 1 second is a bad approximation actually, there are some delays related with telemetry periods, rf side, converters etc..  Actual delay may be around 0.5 seconds im not sure.. If you find some valid documentation it will be great ..

Kadir

2014-03-06 18:19 GMT+02:00 Andrew Chambers <address@hidden>:

Kadir,

You mentioned that the GPS delay is about 1 second. I'm interested in how to determine these lag numbers for different GPS units. Is this delay mentioned in the datasheet? Or do you look at GPS timestamps versus time the message is received by the computer? Or do you physical move the unit and see how long it takes to register the movement?

On Sun, Mar 2, 2014 at 9:56 AM, Kadir ÇİMENCİ <address@hidden> wrote:

hi Sergey,
thanks , thanks for the reply, i will try togive feedback about the issue..
Kadir

2 Mar 2014 18:21 tarihinde "Sergey Krukowski" <address@hidden> yazdı:

Hi!

I'm personally don't gps lag compensation, but use gps speed for hff.
You can just try first without using both of them. Then try to turn on only one thing at a time and check its behavior.

Best Regards,
Sergey

Hello everyone,
Im planning to use Hff filter for my rotorcraft, but not sure about the
"Gps Lag" option.  Do you advice me to use Gps delay option. I am using
ublox lea6s and there is a delay of 1 second approximately for both positon
and speed output. Another question is that, do you advice me to use Hff
filter to estimate horizontal speeds too? or only for position estimates?

Thanks in advance..

Kadir

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