Inventors:
John T. Link - Fort Wayne IN
Gene D. Robertson - Bonita Springs FL
Assignee:
Magnavox Electronic Systems Company - Fort Wayne IN
International Classification:
G01S 352
Abstract:
A Doppler position locator for determining the bearing of a signal source from a moving receiver. The signal source encodes a digital signal indicating its actual transmitting frequency on a transmitted carrier. The moving receiver such as an airplane receives a Doppler shifted carrier frequency and the digital information on what the actual transmitted frequency was. Comparison of the received frequency to the digital information on the transmitted frequency yields a Doppler frequency (the increase or decrease caused by the relative motion, i. e. , the numerical difference between the transmitted and received frequencies). From the aircraft velocity and the two frequencies, the bearing can be determined using the formula. crclbar. =cos. sup. -1 (d*c)/(f*v) where. crclbar. is the bearing angle, f is the transmitted frequency, d is the Doppler shift or change in frequency, c is the speed of light and v is the magnitude of the receiver velocity.