On Mon, Jan 27, 2014 at 9:42 AM, Martin Braun <martin.braun@ettus.com> wrote: > On 01/26/2014 08:14 PM, Marcus D. Leech wrote: >> On 01/26/2014 02:10 PM, Marco Bosco wrote: >>> >>> Thanks for your suggestions. >>> >>> Does anyone can suggest a simple way to get the Doppler shift >>> frequency calculated by a satellite tracker software (e.g. Gpredict) >>> and pass it to GNURadio? I found this >>> https://github.com/darkstar007/GroundStation >>> <https://github.com/darkstar007/GroundStation> but I am wondering if >>> there are other solutions. >>> >>> BTW using Hamlib with Gpredict, it is very easy to tune analog radio >>> but USRP is not supported, if I am correct. > > You could also access the Gpredict values from within a block and pass > them to processing. > Indded, and actually USRP are supported in the sense that gqrx has a gpredict/hamlib compatible TCP interface for setting the frequency: http://gqrx.dk/doc/remote-control If you want to make your own gnuradio application, you can create a block that can speak this hamlib rigctld protocol or you could also use pyephem, which can also calculate planets, moons, asteroids, UFOs, etc. http://rhodesmill.org/pyephem/ Alex