Thursday, February 08, 2007

XM Files Another Patent Application to Operate Satellites in Tundra Orbit

XM had yet another application published today for the operation of satellites in tundra orbits. One has to wonder what all this activity is about. XM's present satellites operate in a geostationary orbit in the Clark belt, as we understand it. Sirius' satellites operate in tundra orbits.

The first patent we kind of blew off as some relic of the past. The European application was just a follow up to that, it seemed. That they are actively working of the idea is another matter. Do they plan to change their constellation? Probably not, but still... Are they going to use this against Sirius? Is this why Sirius now plans to put a satellite in geostationary orbit? Are they planning satellite radio elsewhere where this type of constellation might be useful? The application only references the US. This is curious.

United States Patent Application 20070032191
Kind Code A1
Marko; Paul D. February 8, 2007

Method and apparatus for selectively operating satellites in tundra orbits


A satellite system provides geosynchronous satellites in elliptical orbits in respective elliptical orbital planes separated by 120 degrees. The satellites traverse a common figure-eight ground track comprising northern and southern loops. The satellites are controllably switched to operate the satellite currently traversing the northern loop to deliver a selected signal (e.g., a selected frequency signal) to satellite receivers.

Inventors: Marko; Paul D.; (Pembroke Pines, FL)
Correspondence Name and Address:
1300 19TH STREET, N.W.
Serial No.: 543916
Series Code: 11
Filed: October 6, 2006

U.S. Current Class: 455/12.1
U.S. Class at Publication: 455/012.1
Intern'l Class: H04B 7/185 20060101 H04B007/185

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realwx said...

This should get interesting. I know one of the guys who patented the figure-8 for Sirius itself and see what his word is on this.

Bert said...

That patent number is 6,223,019, invented by Robert Briskman and Robert Nelson, for those that are interested. It does appear to be very similar.