Aircraft traffic alert and collision avoidance device

Details Aircraft traffic alert and collision avoidance device Aircraft traffic alert and collision avoidance device

1992-03-18

1995-02-07

Teska, Kevin J.

Boots, shoes, and leggings

364439, 36442406, 36442401, 342 32, 342455, 342 37, 340961, G06F 1550

Patent

active

053880471

ABSTRACT:
A proximity warning device for aircraft responds solely to transmissions from transponders. The host aircraft has a host transponder and a signal is generated therein and coupled to the device to indicate transmission of a host reply. Selective suppression is implemented based on presence of an SSR beam which is indicated by the signal. Suppression pulses have a fixed duration but randomly selected intervening durations. Data collection proceeds without regard for suppression or the presence of host replies. The shaping of data collection intervals free of interference from suppression provides for improved efficiency for later data decoding and processing. The signal is used to specially mark collected data generated by a host reply. The ability to discriminate between host and other replies allows completely new performance monitoring functions. In one case, the health of the receiver is deduced from the amplitude of host replies. In another case the effectiveness of suppression is noted by capturing host replies in the presence of a suppression pulse.

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"Minimum Operational Performance Standards for Traffic Alert and Collision Avoidance System (TCAS) Airborne Equipment", vol. 1, Consolidated Edition, Radio Technical Commission for Aeronautics, Document No. RTCA/DO-185, Sep. 23, 1983, Consolidated Sep. 6, 1990, pp. 30-35, 84.

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