A calibration method and a
system for providing calibration data for use with a direction finder are provided. The method comprises providing a
relative motion of a calibration
receiver in a circle manner with respect to calibration
transmitter at a predetermined distance from each other. The method also includes preparing and transmitting a communication frequency
signal employed for transmitting a certain frequency from a
list of predetermined frequencies. The preparing comprises: (a) setting a value of the dwell time ranges of the communication frequency
signal to a predetermined value; (b)
synchronizing in time the dwell time ranges between the calibration
transmitter and the calibration
receiver by using
clock signals of a common synchronization source; (c) providing a hop
duration time interval within the dwell
time range for transmitting the frequency; and (d) generating the communication frequency
signal corresponding to the frequency during the hop duration interval. At the calibration
receiver end, the method includes scanning the
list of predetermined frequencies; intercepting a frequency signal transmitted during the hop
duration time interval within the dwell time ranges; and rejecting all other frequency signals received within the dwell time ranges having duration different than the hop
duration time interval by the receiver.