Patent RU-2634299-C1 (RU)
Title: Phase radio direction-finding apparatus
Inventor: BESPALOV EVGENIJ SEMENOVICH
IPC: G01S3/48
Filed: 2016-12-08
Granted: 2017-10-26
Abstract: FIELD: radio engineering, communication. 
     SUBSTANCE: radio direction-finding apparatus comprises: an antenna system, an antenna control unit, a phase modulator and an antenna signal processing unit, this signal processing unit comprises an azimuth mark forming device whose first input serves as an input of the antenna signal processing unit, and the second input is connected to the output of the phase modulator and serves as the second input of the antenna signal processing unit, and a measured azimuth display device, the input of this display device is connected to the output of the azimuth mark forming device, and the output serves as the output of the signal processing unit of the antenna system and the output of the direction-finding apparatus, wherein the antenna system is either an antenna moved in a horizontal plane around a circle with an angular frequency Ω, or antenna elements mounted around a circle and switched with this frequency, and the movement of the antenna or switching of the antenna elements is carried out by signals from the output of the antenna system control unit, wherein a stationary antenna is mounted in the center of the circle, except for the signal of antenna movement with a frequency in the antenna system control unit, an oscillation is generated with a frequency Ω different from Ω by an amount ΔΩ and supplied to the control input of the phase modulator, and the signal input of the phase modulator receives oscillation from the central vibrator of the antenna system, and the output oscillation of the phase modulator and the signal from the output of the switched elements of the antenna system are fed to the corresponding inputs of the azimuth mark forming device of the antenna system signal processing unit, wherein in the mentioned phase direction-finding apparatus, an azimuth mark signal converting device is introduced to the antenna signal processing unit between the azimuth mark forming device and the measured azimuth display device, the input of this azimuth mark signal converting device is connected to the output of the azimuth mark forming unit of the antenna system signal processing unit, and the output of the azimuth mark signal converting device is connected to the input of the measured azimuth display device of the antenna system signal processing unit, wherein the azimuth mark signal converting device comprises series-connected stages of mark signal conversion, each of which contains two identical amplifiers and a multiplier of the output signals of the amplifiers, the inputs of both amplifiers are combined and serve as a stage input, and the outputs of the amplifiers are connected to the corresponding inputs of the multiplier, the output of the multiplier serves as the output of the conversion stage, the input of the first stage serves as the input of the azimuth mark signal converting device, and the output of the last stage is the output of the azimuth mark signal converting device. 
     EFFECT: increased ratio of the main lobe level of the formed azimuth mark to the level of the side lobes of the mark. 
     2 dwg