| 摘要 |
The present invention improves the performance of existing secondary surveillance radar (SSR) transponder multilateration (MLAT) systems using a Time Lag of Arrival (TLOA) measurement. The present invention correlates TCAS interrogation messages and reply messages, which are transmitted on different frequencies, to determine TLOA measurements that are used with TDOA MLAT to achieve higher positioning accuracy and greater surveillance coverage than conventional MLAT systems. The present invention applies to any MLAT system including surface MLAT, Wide-area MLAT, active MLAT, passive MLAT, range-aided MLAT, non-range aided MLAT, Precision Runway Monitoring (PRM) MLAT, and any other MLAT system based on receiving SSR transponder signals. The present invention also applies to Mode-S transponder signals and ATCRBS transponder signals. |
