Communications: directive radio wave systems and devices (e.g. – Directive – Position indicating
Reexamination Certificate
2006-06-13
2006-06-13
Phan, Dao L. (Department: 3662)
Communications: directive radio wave systems and devices (e.g.,
Directive
Position indicating
C342S129000, C342S131000
Reexamination Certificate
active
07061428
ABSTRACT:
An arrangement comprising a master unit and one or more slave units, where the master sends out bursts, at specified intervals, in a frequency hopping manner, with each burst being at a different frequency. The slave responds with acknowledgements, and the signal strengths of the acknowledgments are used to select one or more of the acknowledgments as the signals used for distance, or range, estimation. Advantageously, the durations of the intervals are fairly long during normal operation, and short at times when certain conditions occur, such as loss of communication or when accurate range estimation is required. Also, the slave is adapted to sleep while it is not expecting a burst transmission from the master, thereby saving power. The frequency hopping sequencing is preferably pseudo random, with a different sequencing of the same set of frequencies at different modes of operation.
REFERENCES:
patent: 4396268 (1983-08-01), Shenk
patent: 4551825 (1985-11-01), Biber
patent: 4554668 (1985-11-01), Deman et al.
patent: 5757308 (1998-05-01), Lissel et al.
patent: 6710719 (2004-03-01), Jones et al.
Amir Israel
Naim Ari
Brendzel Henry T.
Phan Dao L.
Remote Play, Inc.
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