초록 ▼

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 Ra

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.

대표청구항 ▼

[ What is claimed is:] [1.] A method for calibrating a multilateration system, comprising the steps of:receiving, at a plurality of first radio receivers having known position values, a first radio signal from a first transmitter having a known position value;measuring a first time value when the fi

[ What is claimed is:] [1.] A method for calibrating a multilateration system, comprising the steps of:receiving, at a plurality of first radio receivers having known position values, a first radio signal from a first transmitter having a known position value;measuring a first time value when the first radio signal is received at one of the plurality of first radio receivers;measuring first time difference values between when the first radio signal is received at the one of the plurality of first radio receivers and when the first radio signal is received at others of the plurality of first radio receivers;calculating a first theoretical time difference values for each of the others of the plurality of first radio receivers based upon the known position value of the first transmitter and the known position values of the first radio receivers; andgenerating first error correction values, for each of the others of the plurality of first radio receivers, proportional to the difference between the first time difference values and the first theoretical time difference values.