Angle of Arrival (AOA)
AOA direction finding, which requires the SKYPERION DF Sensor, provides the operator with a line of bearing to the received Signal Of Interest (SOI) by analysing the signal strengths received between directional antenna elements in the sensor array. AOA is effective with any RF transmission modulation as it responds directly to receive RF power. Advantages include an excellent detection range resulting from directional antenna gain alongside the ability to minimise multipath components to determine improved quality of SOI bearings.
AOA measures signal power. So its ability to generate the line of bearing is limited only by the noise floor of the receiver. The SKYPERION uses circular polarised antennas in its design – giving the operator the advantage of maximising the received signal strength from most transmitting signal polarisations. This includes all linear polarization, irrespective of orientation. Therefore overcoming the polarisation loss against say, a horizontally polarised signal suffered by alternative direction finding systems.
Geolocation of the Signal Of Interest is provided by resolving AOA line of bearings from two or more Sensors. Combining them at their intersection point to provide geolocation to a single point. In addition, this allows the tracking of the intersection point and the route taken by the Signal Of Interest. When augmented with TDOA geolocation results, AOA provides assured geolocation over the greatest possible range of target signal types.
The line of bearing from any single SKYPERION DF sensor can be used to skew the EO/IR camera in the same direction to “stare” along that line of bearing at the target. Where a geolocation result is found for the Signal Of Interest, all the systems cameras can be automatically or manually skewed to look at the region where it’s located.