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Details
Inventors: Leopold, Raymond Joseph; Olds, Keith Andrew; Daniel, Brian Michael;
Assignee: Motorola, Inc. (Schaumburg, IL)
Primary Examiner: Eisenzopf; Reinhard J.
Assistant Examiner: Le; Thanh
Attorney, Agent or Firm: Johanson; Kevin K.

A constellation (12) of satellites (14) distributed around the earth supports satellite-based communication system (10) involved in global communication of subscriber units (24). Subscriber units (24) may potentially transmit from any location on earth. Some locations such as radio astronomy sites (28) may be interfered with by nearby transmissions from subscriber units (24) or transmissions from satellites (14). Subscriber units (24) located within a potentially interfering proximity to radio astronomy sites are prohibited from transmitting potentially interfering signals by reception of a non-interfering control signal transmitted by a radio astronomy special equipment located at radio astronomy sites. A radio astronomy special equipment (44) repeatedly transmits to a subscriber unit (24) a control signal synchronous with a control signal of a servicing satellite. The radio astronomy special equipment control signal (46), (48), and (54) is compatible with a subscriber unit's communication receiver.

DETAILED DESCRIPTION What is claimed is: 1.
A method of mitigating electromagnetic interference during a scheduled radio astronomy session as scheduled at a radio astronomy site, said electromagnetic interference created by operating a satellite-based communication system, said method comprising the steps of: (a) requesting interference mitigation services for said scheduled radio astronomy session from a radio astronomy site to a ground control station; (b) transmitting a mitigation timetable from said ground control station to radio astronomy special equipment; (c) receiving said mitigation timetable at said radio astronomy special equipment; (d) activating said radio astronomy special equipment located at said radio astronomy site according to said mitigation timetable for mitigating said electromagnetic interference during said scheduled radio astronomy session; and (e) inhibiting said electromagnetic interference from a subscriber unit of said satellite-based communication system, said subscriber unit located within a protection zone encompassing said radio astronomy site.
2.
A method as recited in claim 1, wherein step (a) comprises the steps of: (a1) determining at said radio astronomy site a start time for said scheduled radio astronomy session; (a2) determining at said radio astronomy site a duration for said scheduled radio astronomy session; and (a3) communicating said start time and said duration of said scheduled radio astronomy session to said ground control station of said satellite-based communication system.
3.
A method as recited in claim 2, wherein step (d) comprises the steps of: (d1) evaluating said start time of said mitigation timetable for commencement of mitigation services; (d2) upon arrival of said start time, activating said radio astronomy special equipment; (d3) said radio astronomy special equipment transmitting a control signal about said radio astronomy site; and (d4) said radio astronomy special equipment remaining activated throughout said duration of said scheduled radio astronomy session



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