Method of altitude track initialization in an aircraft tracking

Details Method of altitude track initialization in an aircraft tracking Method of altitude track initialization in an aircraft tracking

1992-12-22

1994-05-31

Hellner, Mark

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

Aircraft collision avoidance system

With transponder

342 32, 342 37, 342 40, G01S 1300

Patent

active

053173163

ABSTRACT:
A method of processing a plurality of replies of target aircraft provided in response to interrogation signals from the surveillance aircraft during surveillance periods to determine whether an altitude track may be initialized for use in a traffic alert and collision avoidance system includes the step of selecting three replies, one from each of three consecutive surveillance periods. The replies have binary or coded altitude data of high or low confidence. The binary or coded altitude data of non-adjacent and adjacent replies of the selected replies are compared and an altitude difference value for each of the comparisons is generated. Further efforts to initialize a track are discarded if any of the altitude difference values are greater than first predetermined separated altitudes if and only if such compared non-adjacent and adjacent replies have binary or coded altitude data of high confidence. The binary or coded altitude data of the non-adjacent and adjacent replies are further compared whether or not the replies have binary data of low or high confidence to determine whether an altitude track may be initialized. The process applies if the altitude data is Gilham code, binary, or other encoded data with single bit errors.

REFERENCES:
patent: 5081457 (1992-01-01), Motisher et al.
patent: 5107268 (1992-04-01), Sturm et al.
U.S. patent application Ser. No. 07/968,100 "A Method of Reducing False Track Due to Suppression Pulse Replies in an Aircraft Tracking System".
U.S. patent application Ser. No. 07/767,007 "Method of Bearing Determination Utilizing a Bottom Antenna in an Aircraft Tracking System".
U.S. patent application Ser. No. 07/976,150 "A Method of Improved Initial Transmission of Acquisition and Tracking Interrogations in an Aircraft Tracking System".
U.S. patent application Ser. No. 07/687,965, Ybarra, et al., Improved Track Extension for Use with ATCRBS Surveillance Procedures.
Minimum Operational Performance Standards for Traffic Alert and Collision Avoidance System (TCAS) Airborne Equipment, vol. I and II, Consolidated Edition, Document No. RTCA/DO-185, Sep. 23, 1983, Consolidated Sep. 6, 1990, Radio Technical Commission for Aeronautics.
ATA Standard for TCAS II Displays, Symbology and Controls, Revision A, Sep. 1, 1989, Air Transport Association of America.
"Airworthiness Approval of Traffic Alert and Collision Avoidance Systems (TCAS II) and Mode S Transponders", Advisory Circular, U.S. Department of Transportation, Federal Aviation Administration, Apr. 27, 1990.

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