Patent ID: 8630799

Claim:
A secondary optical system for weighing measurements in radio frequency object navigation in an array of beacons comprising: an optical source having at least one optical emitter emitting an optical signal and mounted to either the moving object or a beacon of the array of beacons, the moving object in simultaneous radio frequency communication with at least two beacons of the array of beacons to determine dynamic position of the object; an optical detector mounted to the other of a moving object or the beacon of the array of beacons relative to said optical source, said optical detector receiving the optical signal when line of sight exists between the moving object and a beacon of the array of beacons; and electronics for determining the dynamic position of the moving object by radio frequency signals that uses a weighting factor that favors the communication of at least two beacons of the array of beacons for which a moving object-beacon optical line of sight exists.