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Re: [Paparazzi-devel] real time telemetry questions

From: Haiyang Chao
Subject: Re: [Paparazzi-devel] real time telemetry questions
Date: Fri, 23 Jan 2009 14:41:38 -0700

Thanks, Pascal.
But gps msg is only 4 hz.
Maybe I will just try to add another msg to send everything I want with the timer on tiny.
I need high frequency data because I am trying to do some system identification.

Haiyang Chao

On Fri, Jan 23, 2009 at 10:43 AM, <address@hidden> wrote:

>  154.629 166 GPS_SOL 591 202441 0 7 I just don't know what exactly is the timer 154.629. (I replaced the SACC with my value.)

Time in seconds since the server has been started (sw/ground_segment/tmtc/ and 225)

>(2) Is it possible that we get another kind of more accurate timer instead of the default timer in pprz msg? We have an IMU
> onboard sending data to pprz board. but I found out that the log on IMU and pprz telemetry on gcs are not the exactly same. It
> has a random delay varing between 0-0.5second. Any body know why?

 Transmission latency ?
 The gps.h:gps_itow contains the TOW (in ms) of the last received GPS message. It could be used as a time source.


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