Terminal Doppler Weather Radar/Low-Level Wind Shear Alert System Integration Algorithm Specification. Version 1.1
MASSACHUSETTS INST OF TECH LEXINGTON LINCOLN LAB
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There will be a number of airports that receive both a Terminal Doppler Weather Radar TDWR windshear detection system and a phase III Low-Level Wind Shear Alert System LLWAS. At those airports, the two systems will need to be combined into a single windshear detection system. This report specifies the algorithm to be used to integrate the two subsystems. The algorithm takes in the alphanumeric runway alert messages generated by each subsystem and joins them into integrated alert messages. The design goals of this windshear detection system are 1 to maintain the probability of detection for hazardous events while reducing the number of false alerts and microburst overwarnings and 2 to increase the accuracy of the lossgain estimates. The first design goal is accomplished by issuing an integrated alert for an operational runway whenever either subsystem issues a strong alert for that runway by canceling a weak windshear alert on an operational runway if only one subsystem is making the declaration and by reducing a weak microburst alert on an operational runway to a strong windshear alert if only one subsystem is making the declaration. The second design goal is accomplished by using the average of the two lossgain values, when appropriate.
- Active and Passive Radar Detection and Equipment