G - Physics – 01 – S
Patent
G - Physics
01
S
340/95
G01S 13/74 (2006.01) G01S 13/76 (2006.01)
Patent
CA 1338803
Aircraft transponder reply rate limiting in air traffic control employing a circular memory queue to store the times of prior responses up to the limits of circular memory queue capacity. Separate circular memory queues contain the times of (1) long replies, and both (2) long or short replies. Each circular memory queue has a pointer and several offset indicators which are spaced from the pointer to the time entry positions at predetermined intervals according to corresponding preestablished criteria. After each transponder reply, the time of the reply is entered in the circular memory queue at a next pointer location. EARtimes, i.e., earliest allowable response times, are repeatedly determined and compared to time elapsed from a selected reference time. When the current time exceeds the EARtime, for a given inquiry signal, a response signal is generated by the transponder electronics and is transmitted to the inquiring ground station. EARtimes are based upon predetermined criteria of allowable response rates in selected time periods. The offset indicators spaced from the queue pointer are employed to extract times from particular locations in the circular memory queue. Each extracted time is adjusted to a predetermined extent to establish a candidate EARtime from which a final EARtime is selected.
604169
Honeywell Inc.
Smart & Biggar
LandOfFree
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