Method and system for calibration of a radio direction finder

Details Method and system for calibration of a radio direction finder Method and system for calibration of a radio direction finder

2007-12-25

2007-12-25

Tarcza, Thomas (Department: 3662)

Communications: directive radio wave systems and devices (e.g.,

Clutter elimination

C455S063300, C455S001000, C455S552100, C375S134000

Reexamination Certificate

active

11113129

ABSTRACT:
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.

REFERENCES:
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patent: 6806837 (2004-10-01), Saucier et al.
patent: 7016649 (2006-03-01), Narasimhan et al.
patent: 2003/0187601 (2003-10-01), Doufor et al.
patent: 2003/0197643 (2003-10-01), Fullerton et al.
ATIS Committee, Feb. 28, 2001, Definition: Frequency Hopping.

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