Analyzing Starlink Satellite Downlink Communications With Application Defined Radio

Usually, mere curiosity is sufficient to do a thing. This is also the circumstance with men and women striving to examine the communication setup and protocol which SpaceX is making use of with their Ku-band based mostly Starlink satellites.  One particular of these good folk is [Christian Hahn], who has not too long ago posted some early findings to r/StarlinkEngineering around at Reddit. Some of the captured information seems to include things like the satellite ID method that floor-dependent user stations would presumably use to maintain monitor of overhead Starlink satellites.

For the capturing by itself, [Christian] is applying a 2nd-hand dish for seize and a Do-it-yourself SDR applying KC705 FPGA-centered components – which could have begun its lifestyle as crypto mining hardware – along with the usual assortment of filters and other prevalent factors with this sort of capture. Even at this early time, some options of the Starlink protocol appear to be really noticeable, these as the division into channels and the use of guard intervals. Nothing at all far too earth-shattering, but as a enjoyable SDR passion it absolutely checks all the bins.

[Christian] has also declared that at some stage he’ll established up a web-site and publish the results and code that must make Starlink signal investigation straightforward for any one with a readily readily available SDR receiver.