摘要:
A collision avoidance system includes a sensor adapted to detect at least one vehicle in the vicinity of a predetermined area and generate target data relating to the at least one vehicle. An awareness engine receives the target data and evaluates the target data for a threat of a collision. An alerting system is adapted to alert the at least one vehicle in the event of a threat of a collision, the alerting system being activated by the awareness engine.
摘要:
The present invention relates to low earth orbit satellites for air traffic control. One or more LEO satellites serves as a link between a control tower and an aircraft. The one or more LEO satellites are adapted for a) receiving an Automatic Dependent Surveillance-Broadcast, ADS-B, signal from an aircraft; b) receiving and/or transmitting a signal from/to a control tower; and c) receiving and/or transmitting a VHF signal from/to an aircraft.
摘要:
A collision avoidance system includes a sensor adapted to detect at least one vehicle in the vicinity of a predetermined area and generate target data relating to the at least one vehicle. An awareness engine receives the target data and evaluates the target data for a threat of a collision. An alerting system is adapted to alert the at least one vehicle in the event of a threat of a collision, the alerting system being activated by the awareness engine.
摘要:
The present invention provides a method for validating received positional data in vehicle surveillance applications wherein vehicles transmit positional data indicating their own position to surrounding vehicles, such as an ADS-B-based aircraft surveillance application. The method involves the steps of: receiving, with a radio direction finding antenna arrangement of a receiving unit, a signal carrying positional data indicating an alleged position of a vehicle, transmitted from a radio source; estimating the bearing from the receiving unit to said radio source utilizing said radio direction finding antenna arrangement and the received signal; estimating the distance between the receiving unit and the radio source based on the time of flight for a signal travelling there between at known speed; calculating an estimated position of the radio source based on the estimated bearing and the estimated distance, and determining a deviation value indicating the deviation/coincidence between the alleged position of a vehicle according to the received positional data and the estimated position of the radio source.
摘要:
The invention concerns a method of air navigation or steering assistance for guiding a moving vehicle towards a target whose exact position is not known a priori, in particular a moving target. It is suggested that the moving vehicle and the target use satellite positioning receivers, but, instead of transmitting the position computed by the target to the vehicle, only the pseudo-range and the pseudo-velocity measurements between the target and the satellites, together with the identification of the satellites used are transmitted (by radio) to the vehicle. The method consists in periodically carrying out pseudo-range and pseudo-velocity and measuring time measurements with the moving vehicle receiver, determining in the vehicle the p satellites used both by the vehicle and the target, subtracting, for each of the p satellites, the pseudo-range and the pseudo-velocity measurements determined by the vehicle and those received from the target, and computing on the basis of these subtractions position and relative speed vectors in a landmark between the vehicle and a targeted point linked with the target. The invention is useful for aeroplanes or helicopters alighting on the decks of ships, rendezvous in the air, at sea or in space, homing vehicles onto a marker, etc.
摘要:
One embodiment is directed to an aircraft position report system. The system comprises a satellite, an aircraft position reporting receiver mounted on the satellite, an antenna element mounted on the satellite, and an antenna interface mounted on the satellite. The aircraft position reporting receiver receives aircraft position reports through the antenna element by associating a spot beam with a narrow coverage area. The aircraft position reports are derived from a signal produced by the antenna element. The antenna interface changes the narrow coverage area associated with the spot beam to receive aircraft position reports from a wide coverage region within a reporting period. In one exemplary embodiment, the antenna interface mechanically steers the spot beam for each receiver to one of the narrow coverage areas. In another exemplary embodiment, the antenna interface electronically steers the spot beam for each receiver to one of the narrow coverage areas.
摘要:
The present invention provides a method for validating received positional data in vehicle surveillance applications wherein vehicles transmit positional data indicating their own position to surrounding vehicles, such as an ADS-B-based aircraft surveillance application. The method involves the steps of: receiving, with a radio direction finding antenna arrangement of a receiving unit, a signal carrying positional data indicating an alleged position of a vehicle, transmitted from a radio source; estimating the bearing from the receiving unit to said radio source utilizing said radio direction finding antenna arrangement and the received signal; estimating the distance between the receiving unit and the radio source based on the time of flight for a signal travelling there between at known speed; calculating an estimated position of the radio source based on the estimated bearing and the estimated distance, and determining a deviation value indicating the deviation/coincidence between the alleged position of a vehicle according to the received positional data and the estimated position of the radio source.