Patent ID: 7312746

Claim:
A calibration system for providing calibration data for use with a direction finder, comprising: (a) a calibration transmitter including: (i) a transmitting antenna, (ii) a transmitter synchronization module configured for providing transmitter clock signals, (iii) a signal generator operable for transmitting communication frequency signals corresponding to a list of predetermined frequencies, (iv) a controller unit coupled to said transmitter synchronization module and said frequency signal generator, and configured for receiving said transmitter synchronization clock signals and producing controller signals required for triggering operation of the frequency signal generator to generate the communication frequency signals sequentially from said list of predetermined frequencies and to transmit said communication frequency signals only during hop duration intervals located within dwell time ranges of said communication frequency signals; and (b) a remote calibration receiver including: (i) an array of receiving antennas for receiving radio frequency transmissions from the calibration transmitter, (ii) a receiver synchronization module configured for providing receiver clock signals, (iii) an onboard direction finder sensor associated with said array of receiving antennas and coupled to the receiver synchronization module, the direction finder sensor being configured for scanning the list of predetermined frequencies, intercepting frequency signals transmitted during said hop duration time intervals located within the dwell time ranges, rejecting all other frequency signals received within the dwell time ranges having duration different than said hop duration time intervals, producing a Signal Descriptor based on the intercepted frequency signals and creating said calibration data based on said Signal Descriptor; and (c) at least one clock source coupled to the transmitter synchronization module and the receiver synchronization module, and being configured for synchronizing clock signals provided by the transmitter and receiver synchronization modules.