Communications: directive radio wave systems and devices (e.g. – Directive – Position indicating
Patent
1998-12-11
2000-07-25
Tarcza, Thomas H.
Communications: directive radio wave systems and devices (e.g.,
Directive
Position indicating
342 39, 342450, G01S 302, G01S 1300
Patent
active
060941693
ABSTRACT:
The accuracy of multilateration systems can be greatly improved by using a correction method based on the SLS (Sideband Lobe Suppression) signal produced by a Secondary Surveillance Radar (SSR). Multilateration is a cooperative surveillance technique for aircraft equipped with Air Traffic Control Radar Beacon System (ATCRBS), Mode S, or Automatic Dependent Surveillance Broadcast (ADS-B) transponders. When one of these transponders aboard a vehicle is interrogated, it responds by broadcasting a message based on what the interrogation requests. These reply messages may be multilaterated to determine the source position of the transmission. Multilateration is a Time Difference of Arrival (TDOA) technique similar to triangulation. Multilateration can be performed to locate the transmission source of any SSR signal. Error detection and correction may be performed on the system by conducting a comparison of a known TDOA for the receiver/transmitter geometry, to the measured TDOA from a Side Lobe Suppression (SLS) pulse emanating from a primary radar.
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Lee Derrick D.
Smith Alexander E.
Bell Robert P.
Mull Fred H.
Rannoch Corporation
Tarcza Thomas H.
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