Saab Ab

Bengt-Göran Sundqvist

Erik Petrini

Henrik Hammarlund

Sören Molander

Hasse Persson

Andreas Persson

Jonas Lovgren

Johan Pellebergs

A method for estimating, from a platform, at least one parameter of an intruder. Consecutive frames of image data at different times of the intruder utilizing at least one passive sensor are generated. A direction from the platform to the intruder is determined based on the generated consecutive frames of image data. A time period remaining until a potential collision between the platform and the intruder is estimated. An angular extent of the intruder, as viewed by the passive sensor, is estimated based on the image data. At least one of a first relative location vector to a minimum intruder associated with the intruder or a second relative location vector to a maximum intruder associated with the intruder is estimated. An arrangement for generating input data to a sense-and-avoid system on-board a platform, a computer program, a computer program product and a platform carrying the arrangement are also provided.

Method and arrangement for estimating at least one parameter of an intruder

A collision avoidance system including a receiver configured to receive navigational data regarding intruding aerial vehicle and own aircraft. Storage is configured to store a plurality of predefined escape trajectories. A processor is configured to compare at least a subset of the predefined escape trajectories with a presumed trajectory of the intruding aerial vehicle and to select one of the predefined escape trajectories based on the comparison. The predefined escape trajectories are pre-simulated, wherein each escape trajectory is associated to a set of navigational data and to an escape maneuver direction.

Collision avoidance system and a method for determining an escape manoeuvre trajectory for collision avoidance

A vehicle control system and method combining control allocation and phase compensation for forming a phase compensated actuator command signal based on a control demand signal. A feedback unit includes a matrix multiplication unit for forming an estimated behavior signal, from a control efficiency matrix and the actuator command signal. The estimated behavior signal is fed to a second summation unit for forming a difference signal. The difference signal is processed by a filter unit for forming a feedback signal which is connected to a first summation unit for forming a modified control demand signal, such that the modified control demand signal is adjusted to always represent a control demand realizable by the vehicle. The modified control demand signal is further connected to the second summation unit and to a control allocator which output is then connected to the matrix multiplier to form a feedback loop.

Vehicle control system and method using control allocation and phase compensation

A range estimation device for use in an aerial platform including at least one passive sensor, a trajectory determination unit and a control system. A control unit is arranged to indicate to the control system to perform own-ship maneuvering of the aerial platform such that characteristics of passive sensor measurements from the at least one passive sensor enable a range estimation to a target to be determined. The control unit is arranged to determine characteristics of the own-ship maneuvering based on the range uncertainty estimations to the target. A method and a computer program product for use in range estimation device.

Range estimation device

A method and a system for avoiding collisions between aircraft. The method includes computing a default fly out maneuver regarding how the aircraft shall be maneuvered during a fly out action, predicting a fly away path including a prediction of the position of the aircraft during the fly out maneuver, sending information about the own fly away path to the other aircrafts, receiving information about fly away paths from the other aircrafts, detecting an approaching collision, and activating the fly out maneuver upon detecting an approaching collision. The method further includes carrying out the following steps after activation the fly out maneuver: receiving the current position of the aircraft, and calculating a compensated fly out maneuver for the aircraft based on the current position of the aircraft, the previously predicted position, and the default fly out maneuver.

System and a method for automatic air collision avoidance

A system and a method for automatically avoiding collisions between own aircraft and other aircraft. The system includes a computing unit configured to compute a fly away path for own aircraft, a sender configured to send the computed own fly away path to the other aircraft, a receiver configured to receive fly away paths from the other aircraft, and a collision handler configured to detect an approaching collision based on the own fly away path and the fly away paths received from the other aircraft, and activating a fly away maneuver upon detecting an approaching collision. The collision handler is adapted to receive information about commanded maneuvers of own aircraft, and to detect an approaching collision based on own aircraft maneuvers commanded during a time period between sending the computed own fly away path to the other aircraft and detecting the approaching collision.

Growing community of inventors

Linköping, Sweden

Bengt-Göran Sundqvist