Navigation aid system
Patent 4106023 Issued on August 8, 1978. Estimated Expiration Date: 
August 8, 1995. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
August 8, 1995. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 2411518 2490050 2547066 2861264 3290685 3798648 3900877 InventorApplicationNo. 05/552568 filed on 02/24/1975US Classes:342/405DopplerExaminersPrimary: Wilbur, Maynard R.Assistant: Berger, Richard E. Attorney, Agent or FirmInternational ClassesG01S 13/00 (20060101)G01S 1/70 (20060101) G01S 13/42 (20060101) G01S 3/14 (20060101) G01S 3/52 (20060101) G01S 1/38 (20060101) G01S 1/00 (20060101) G01S 13/93 (20060101) AbstractAn apparatus or method, for characterizing carrier waves according to the direction in which the carrier waves are transmitted or received, comprises radiating or receiving from a position which is moved repetitively along a line of motion having a predetermined, fixed location in a frame of reference. The radiating or receiving position may be moved so that at least one of the speed and direction of motion is abruptly changed. The radiating or receiving position may be moved back and forth along two non-parallel, straight lines of motion, whereby elevational and aximuthal angles of propagation are determinable solely responsively to the amplitude of the frequency shift induced by the changes in direction of the motion along the lines of motion. | |
