MONOPULSE DIRECTION FINDER Russian patent published in 1998 - IPC

FIELD: radio beacon navigation systems. SUBSTANCE: monopulse direction finder has antenna with two identical radiation patterns spaced by angle and two outputs. Each output is connected through logarithmic receiver to proper input of first subtracter. Antenna has three identical radiation patterns with adjustable width, two of them being turned away in symmetry relative to center pattern by value of angular spacing. Antenna has input controlling width of radiation pattern and third output. Direction finder is inserted with third logarithmic receiver connected to third output of antenna, second subtracter which inputs are connected to outputs of second and third logarithmic receivers, first adder and third subtracter which inputs are connected to outputs of first and second subtracters, four dividers, indicator, square root calculator, fourth subtracter, second adder, squarer, delay unit, terminal for input of value of angular spacing and terminal for input of stabilized value of direction finding sensitivity. Output of first adder is connected to second input of first divider which output is connected to indicator. Controlling input of antenna is connected through delay unit and squarer coupled in series to first input of second adder which output is connected through square root calculator to controlling input of antenna. Output of third subtracter is connected to first input of third divider which output is connected to first inputs of first and second dividers. Terminal for input of stabilized value of direction finding sensitivity is connected to first input of fourth divider which second input is connected to second inputs of second and third dividers and terminal for input of value of angular spacing. Outputs of second and fourth dividers are connected to inputs of fourth subtracter which output is connected to second input of second adder. EFFECT: increased accuracy of direction finding due to correction of a priori uncertainty in direction finding sensitivity, its stabilization at specified level with use of adaptive retuning of width of radiation pattern, possibility of programmable control over direction finding sensitivity in range of variations of propagation of radio waves in scattering media, frequency independence signifying lack of necessity of measurement of frequency of received signal. 2 dwg