Technique for determining relative yaw using phase windup

Details Technique for determining relative yaw using phase windup Technique for determining relative yaw using phase windup

2006-10-17

2006-10-17

Issing, Gregory C. (Department: 3662)

Communications: directive radio wave systems and devices (e.g.,

Directive

Including a satellite

C701S213000, C702S151000

Reexamination Certificate

active

07123187

ABSTRACT:
A technique uses “phase windup” to determine relative yaw of a craft from a plurality circularly polarized signals transmitted from one or more transmission sources. A first difference in carrier phase measurements taken simultaneously at time t1is determined for first and second circularly polarized signals from a given transmitting source A second difference is then determined from simultaneous carrier phase measurements taken at time t2. A third difference, which is the difference between the first and second differences, is then used to determine the relative yaw based on a difference in wavelengths of the two signals. If more than one transmitting source is in view, a mean average of the third differences associated with the respective transmitting sources may be used to determine the relative yaw.

REFERENCES:
patent: 6005514 (1999-12-01), Lightsey
patent: 6593879 (2003-07-01), Campbell
Ford, et al., “Beeline RT20—a Compact, Medium Precision Positioning System With An Attitude”, Proceedings, 1997 Institute of Navigation Conference 1997, Kansas City, Missouri.

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