RECEIVING DEVICE FOR RADIO COMMUNICATION WITH UNDERWATER OBJECT Russian patent published in 2019 - IPC H04B7/08 

FIELD: radio equipment.

SUBSTANCE: device relates to radio engineering and is intended for reception of radio waves of ultralow and extremely low frequencies (ULF and ELF) in marine environment at radio communication with moving underwater object. Device comprises first electrode sensor of electric field in form of first and second electrodes installed on flexible cable towed behind underwater object and connected through cable conductors with preamplifier, and installed on underwater object receiving unit, first and second narrow-band filters, a controlled amplifier, a controlled phase shifter, a subtractor unit, an extreme control unit and a second electrode sensor in form of a third and a fourth electrode installed on the same cable closer to the underwater object, connected through a first narrow-band filter to a controlled amplifier, output of which through controlled phase shifter is connected to first input of subtracting unit, second input of which through second narrow-band filter is connected to output of preamplifier, subtraction unit output is connected to the receiving unit and the first input of the extreme control unit, the second input of which is connected to the output of the first narrow-band filter, the first output of the extreme control unit is connected to the control input of the controlled amplifier, and second output is with control input of controlled phase shifter, wherein distance between third and fourth electrodes is less than between first and second electrodes.

EFFECT: technical result consists in improvement of operational characteristics due to reduced length of cable antenna.

1 cl, 1 dwg