Radio direction finder with enhanced null seeking

Details Radio direction finder with enhanced null seeking Radio direction finder with enhanced null seeking

G - Physics

01

S

343/114

G01S 3/06 (2006.01)

Patent

CA 1216348

ABSTRACT A radio direction finder uses a pair of antennas (41,42) in which each antenna is skewed from a preferred null alignment (46) by a predetermined angle (0). The skewed antennas (41,42) receive signals at a level which is greater than the level that either antenna (41,42) would have if individually aligned in its null position (43). Received signals detected by the antennas (41,42) are amplified in appropriate circuitry (51-54) and compared to one another at a comparator (55). When the antennas (41-42) are aligned so that their nulls are at an equal angle (0) from the direction (57) of a received signal, the comparator (55) indicates a minimum differential signal corresponding to the preferred null alignment (46) parallel to the received signal direction (57). By detecting a signal strength with each antenna (41,42) aligned at an angle (0) from its null (43), the signal strength received by the antennas (41,42) is relatively high compared to signal strength at each antennas's (41,42) null alignment (43). The ability of the present invention to overcome noise further permits inexpensive direction finding techniques to be used with lower frequency radio signals. (READS ON FIGURE 3)

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