Has anyone tried the Spectrum Sensing app that is listed as a part of OsmocomSDR?
http://sdr.osmocom.org/trac/wiki/GrOsmoSDR

 It seems that documentation for it is in the works.  I need to generate a spectrum survey log file comprising time, frequency and signal strength.  My RF front end is a HackRF.  Any pointers would be greatly appreciated.