Method of bearing determination utilizing a bottom antenna in an

Details Method of bearing determination utilizing a bottom antenna in an Method of bearing determination utilizing a bottom antenna in an

1991-09-27

1993-08-10

Tubbesing, T. H.

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

Aircraft collision avoidance system

With transponder

342 37, G01S 1378, G01S 1393

Patent

active

052353362

ABSTRACT:
In a Traffic Alert and Collision Avoidance System on an aircraft having a plurality of antennas, an optimal bearing value is obtained for each target aircraft by generating a target data block for each response to an interrogation, each target data block including a measured bearing value and an associated priority code. A priority code is assigned based on the antenna receiving the information, and the number of valid bearing measurements used to determine a measured bearing value for the reply. If more than one target data block is obtained in a surveillance period, one target data block is retained based on predetermined criteria. The measured bearing value of all the target data blocks having the same, highest priority code are selected or combined, the result being saved in the target data block. The priority codes are then used to select the proper reply bearing measurement, the bearing track update filtering parameters, and to aid in the reply qualification for bearing track initialization.

REFERENCES:
patent: 4910526 (1990-03-01), Donnangelo et al.
patent: 4970518 (1990-11-01), Cole et al.

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