David Morgan 2W0CXV has released several papers covering the use of the RTL-SDR Dongle in radio astronomy
In 2011 David described the equipment configuration and software involved in setting to work a small 3m diameter amateur radio telescope using the FUNcube Dongle Pro software defined radio receiver.
At the end of 2014 he published a paper dealing with the setting up and use of a RTL-SDR dongle to receive meteor pings from the Graves Radar on 143.050 MHz.
He has now released two new papers covering the measurement of signal strength and RF noise sources with the RTL-SDR.
Download David’s papers - http://www.dmradas.co.uk/Downloads.html
You can join the BAA Radio Astronomy Yahoo Group - http://groups.yahoo.com/group/baa-rag