ANPC’s technology uses transponder multilateration with ground-based sensors to track an aircraft’s precise location in vertical position (elevation), horizontal position (azimuth), and range, with very high accuracy. This is done by measuring the arrival time and phase of radio signals transmitted from the aircraft’s radar beacon transponder. The transponder is the same device used by Air Traffic Control radar systems to track aircraft during flight, and every aircraft equipped to fly in Instrument Meteorological Conditions (IMC) must have one installed.
The TLS sensor arrays can be installed allowing for an overall small footprint of approximately 80 meters.
The guidance is perceived by the pilot as needle movements on the ILS course deviation indicator in the cockpit, and can be flown down to the appropriate minimum descent altitude.
The aircraft position can also be displayed with a format matching a Precision Approach Radar display for use in Ground Controlled Approach operations.
The approach profile for TLS is not a function of alignment between the approach path and antennas. Rather, the desired approach path is configured into the system software, therefore the TLS can inherently support offset and non-linear approach procedures where a straight-in approach is not feasible due to noise abatement or obstacle clearance issues.
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