Re: Porting OSGPS to ARM7

Hi Guys, I took a look at GPL-GPS fro arm but it seem to be a pretty
different version of osgps so I went back to the current osgps code
base.

When i am starting the receiver it runs for a few minutes and the
status of the channels are moving between channel state "acquisition"
and "confirm". They tend to not get to state "pull-in". I am also
getting a lot of accumulator misses on a few of the channels. But then
a couple of minutes go by and all of the channels are in state "off".

Here is a snapshot of the output before all go to off:


                   OpenSource GPS Software Version 2.30
Thu Jan  1 00:00:06 1970
                        TOW       6
meas time 0.599998  error 0.000000  delta 0.000000
   latitude    longitude          HAE      clock error (ppm)
     0: 0: 0.00     0: 0: 0.00        0.00  -0.380000
 Speed     Heading      TIC_dt
 0.000000   0.000000   0.100000

tracking  0 status -1610460944 almanac valid 0 gps week -522 alm_page  0
 ch prn state n_freq az el doppler t_count n_frame sfid ura page missed CNo
  0  1   1   -3      0    0        0      0     0   0    0    0    2      0
  1  2   1   -3      0    0        0      0     0   0    0    013392      0
  2  3   1    3      0    0        0      0     0   0    0    0    2      0
  3  4   1   -3      0    0        0      0     0   0    0    013391      0
  4  5   1   -3      0    0        0      0     0   0    0    0 9555      0
  5  6   1   -3      0    0        0      0     0   0    0    013391      0
  6  7   1    0      0    0        0      0     0   0    0    0    1      0
  7  8   1    0      0    0        0      0     0   0    0    013391      0
  8  9   3    0      0    0        0      0     0   0    0    0   31      0
  9 10   3    0      0    0        0      0     0   0    0    013390      0
 10 11   3    0      0    0        0      0     0   0    0    0    1      0
 11 12   3    0     -0    0        0      0     0   0    0    013390      0
 GDOP= 0.000  HDOP= 0.000  VDOP= 0.000  TDOP= 0.000




As you can see, it seems to not have any real data yet.

My question is, what does this data tell someone more comfortable with
osgps tell you? If anything. And does anyone have a suggestion on what
to look for or what to debug to give clues on to if the system is
seeing gps correlation data correctly?

Thanks for any insight, i am quite lost. (maybe pun intended :)
-Scott


On Thu, Jan 14, 2010 at 10:01 AM, scott nichols <[email protected]> wrote:
> Hello!
>
> I am starting the process of porting OSGPS to a main loop style program
> running on an embedded ARM platform. I was wondering if there is similar
> open source project anyone knows of using OSGPS and ARM in a main loop?
> Forgive me if this is covered in the documentation, I am off to read more
> now! Thanks!
>
> -Scott
>
>
>