gps-satellite sky-plot

Hi All,

i'm starting to learn matplotlib,
for my study i need to parse the nmea sentence from a gps
and plot a "sky graphic" to plot satellite visibility.

(i tried to write code from scratch ... it works but my teacher suggest me to not reinvent the well, so, to have a good nema parser, i installed gpsd ... it has in the source code a nice python code that allow me to retrieve satellite constallation iformation).

now i need to learn how to produce a sky plot,
have you any suggestion on how to produce such kind of graphic ?

thanks to all for any suggestion!

Massimo.

Massimo Di Stefano wrote:

Hi All,

i'm starting to learn matplotlib,
for my study i need to parse the nmea sentence from a gps
and plot a "sky graphic" to plot satellite visibility.

(i tried to write code from scratch ... it works but my teacher suggest me to not reinvent the well, so, to have a good nema parser, i installed gpsd ... it has in the source code a nice python code that allow me to retrieve satellite constallation iformation).

now i need to learn how to produce a sky plot,
have you any suggestion on how to produce such kind of graphic ?
  
Massimo: I've no idea what a "sky plot" is. Can you point us to an example?

-Jeff

···

thanks to all for any suggestion!

Massimo.

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Hi Jef,

please apologize me for the delay

i had days without internet connection :-/

sorry if i gived you a bad explanation …

for sky plot i means plot like :

http://www.tpub.com/content/armyengineer/en0593a/en0593a0209.htm

the data i’m receiving from the gps device are :

PRN = satellite ID

EL = ELevation (integer 0-90)

AZ = Azimuth (integer 0-359)

Ss = Signal-Strenghts (decibels)

Used = (1,0)

for each satellite visible at the moment,

i receive data for each second.

i’m printing the data in an html table

http://img43.imageshack.us/i/immagine3ftd.png/

but i tring to learn how to use matplotlib to display the data in a “sky-plot” (i don’t know the real name of this polar-diagram)

i gived a look at matplotlib tutorial pages … and i find really usefull the “web-plot” example

… i’ll follow that way

but the real problem is :

i don’t know the math formulae and matplotlib syntax needed to create a such kind of plot.

thanks for any suggestion!

regards,

Massimo.

···

Il giorno 03/lug/09, alle ore 03:34, Jeff Whitaker ha scritto:

Massimo Di Stefano wrote:

Hi All,

i’m starting to learn matplotlib,
for my study i need to parse the nmea sentence from a gps
and plot a “sky graphic” to plot satellite visibility.

(i tried to write code from scratch … it works but my teacher suggest me to not reinvent the well, so, to have a good nema parser, i installed gpsd … it has in the source code a nice python code that allow me to retrieve satellite constallation iformation).

now i need to learn how to produce a sky plot,
have you any suggestion on how to produce such kind of graphic ?

Massimo: I’ve no idea what a “sky plot” is. Can you point us to an example?

-Jeff

thanks to all for any suggestion!

Massimo.



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