Abstract: A method of and system for managing data transmissions from a plurality of targets (e.g., aircraft), each of which is equipped with an on-board broadcast system that transmits data within an established time frame. The method includes the steps of defining at least a first geographic region and a second geographic region, for each geographic region, dividing the established time frame into a contiguous set of time slots, defining a time slot sequence order by which each target within each geographic region will transmit data within said established time frame, and instructing each aircraft located within the first geographic region to transmit its data at a specific index point or offset within the time slot sequence order for the first geographic region and each aircraft located within the second geographic region to transmit its data at a specific index point or offset within the time slot sequence order for the second geographic region.

Abstract: A secure system for authenticating the identity of ADS-B systems, including: an authenticator, including a unique id generator and a transmitter transmitting the unique id to one or more ADS-B transmitters; one or more ADS-B transmitters, including a receiver receiving the unique id, one or more secure processing stages merging the unique id with the ADS-B transmitter's identification, data and secret key and generating a secure code identification and a transmitter transmitting a response containing the secure code and ADSB transmitter's data to the authenticator; the authenticator including means for independently determining each ADS-B transmitter's secret key, a receiver receiving each ADS-B transmitter's response, one or more secure processing stages merging the unique id, ADS-B transmitter's identification and data and generating a secure code, and comparison processing comparing the authenticator-generated secure code and the ADS-B transmitter-generated secure code and providing an authentication signa