DOUBLE-CHANNEL DIRECTION FINDER Russian patent published in 1997 - IPC

FIELD: radio beacons. SUBSTANCE: device has antenna with two identical beam patterns which differ in their direction angle. In addition antenna has two outputs each of which is connected to subtraction unit through logarithmic receiver. Antenna provides possibility to control width of beam patterns and has input for control of width of beam patterns. In addition device has two linear receivers, correlator, logarithmic function generator, delay unit, two squarers, two multipliers, two adders, four dividers, square root calculation unit, subtraction unit, terminal for input of direction sensitivity level to be stabilized, terminal for input of angle between beam patterns, and indicator. Each output of antenna is connected to input of correlator through linear receiver. Output of correlator is connected to first input of first multiplier through logarithmic function generator. Control input of antenna is connected to second inputs of first and second multipliers and first input of second adder through serial circuit of delay unit and first squarer. Output of second adder is connected to control input of antenna through square root calculation unit. Terminal for input of angle between beam patterns is connected to input of second squarer, first inputs of second multiplier and third divider and first input of fourth divider which second input is connected to terminal for input of direction sensitivity level to be stabilized. Inputs of third and fourth dividers are connected to inputs of second subtraction unit, which output is connected to second input of second adder. Outputs of first multiplier and second squarer are connected to inputs of first adder, which output is connected to first input of first divider. Output of second multiplier is connected to second input of first divider, which output is connected to second inputs of second and third dividers. Output of first subtraction unit is connected to first input of second divider, which output is connected to indicator. EFFECT: decreased drift of direction estimation due to elimination of a priori uncertainty in direction sensitivity; stabilization of direction sensitivity by means of adaptive tuning of beam pattern width; possibility of program control of direction sensitivity under conditions of signal bandwidth and wave transmission in scattering medium. 1 dwg