High-capacity location and identification system for cooperating mobiles with frequency agile and time division transponder device on board
First Claim
1. A high-capacity surveillance and data link system able to locate and identify cooperating mobiles provided with a respective transponder device and a fixed infrastructure comprising fixed transmitting and receiving stations, the system being arranged to locate and identify the cooperating mobiles using Multilateration and/or Automatic Dependent Surveillance-Broadcast (ADS-B) techniques by means of transmission of position, identification, status information and ancillary data from the mobiles to the fixed receiving stations on the Secondary Surveillance Radar (SSR) Mode S channel, the system being further arranged to transmit commands, controls, nearby traffic information and ancillary data from the fixed transmitting stations to the cooperating mobiles on the Secondary Surveillance Radar (SSR) Mode S channel, the system being characterized in that each transponder is provided with a variable carrier frequency and the system is arranged to implement frequency-division multiple access in the down-link Secondary Surveillance Radar (SSR) Mode S channel using the variable carrier frequencies.
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Accused Products
Abstract
Cooperating mobiles (ground vehicles, aircraft) are located and identified by Multilateration and Automatic Dependent Surveillance-Broadcast (ADS-B) techniques using the frequency band and the format of the Secondary Surveillance Radar (SSR) signals in high traffic situations. Standard messages, transmitted by the mobile on the downlink channel, i.e. to a set of fixed receiving stations, and including the identification code, permit the location of the mobile by multiple time measurements (Multilateration) from a subset of the set of fixed receiving stations; when the message contains the position (GPS and, later, Galileo datum) the mobile may be located with the ADS-B when in view even of a few stations or of a single station. In order to overcome the problem that arises with high traffic, i.e. the superimposition of signals, called garbling.
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Citations
25 Claims
- 1. A high-capacity surveillance and data link system able to locate and identify cooperating mobiles provided with a respective transponder device and a fixed infrastructure comprising fixed transmitting and receiving stations, the system being arranged to locate and identify the cooperating mobiles using Multilateration and/or Automatic Dependent Surveillance-Broadcast (ADS-B) techniques by means of transmission of position, identification, status information and ancillary data from the mobiles to the fixed receiving stations on the Secondary Surveillance Radar (SSR) Mode S channel, the system being further arranged to transmit commands, controls, nearby traffic information and ancillary data from the fixed transmitting stations to the cooperating mobiles on the Secondary Surveillance Radar (SSR) Mode S channel, the system being characterized in that each transponder is provided with a variable carrier frequency and the system is arranged to implement frequency-division multiple access in the down-link Secondary Surveillance Radar (SSR) Mode S channel using the variable carrier frequencies.
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20. A Mode-S transponder system comprising:
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transponders each configured for attachment to a respective mobile and each including a carrier frequency selector for variably selecting a carrier frequency within one of a plurality of channels around 1090MHz; and an infrastructure comprising a fixed transmitter and a fixed receiver, the transponders being further configured to implement frequency division multiple access in a downlink Secondary Surveillance Radar (SSR)-Mode S channel wherein a first one of the transponders is configured to transmit signals comprising one or more of position, identification, status information and ancillary data to the fixed receiver at a first carrier frequency selected via the corresponding carrier frequency selector and a second one of the transponders is configured to transmit signals comprising one or more of position, identification, status information and ancillary data to the fixed receiver at a different, second carrier frequency selected via the corresponding carrier frequency selector. - View Dependent Claims (21, 22, 23, 24, 25)
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Specification