Magnetic antenna device for underwater ultra-low frequency signal reception

Abstract

The invention discloses a magnetic antenna device for underwater ultra-low frequency signal reception, which includes an upper layer antenna array and a lower layer antenna array arranged in parallel and spaced up and down; the upper layer antenna array includes first magnetic antennas distributed in a square in the same horizontal plane, The second magnetic antenna, the third magnetic antenna, and the fourth magnetic antenna; the antenna array on the lower layer has the same structure as the antenna array on the upper layer, and slow-wave materials are filled between the magnetic antennas. The present invention adopts an array antenna design, which is divided into upper and lower layers, and can realize omnidirectional signal reception. At the same time, according to the directional filtering characteristics of the magnetic antenna and the difference in the output waveform intensity and spectrum intensity of each magnetic antenna, the source of the ultra-low frequency signal is determined. Wave direction, and determine that the incoming wave signal collected by the upper and lower magnetic antennas close to the incoming wave is a more reliable sample at that moment, and then process the obtained sample through filtering and noise cancellation to obtain an ultra-low frequency signal.

Description

technical field [0001] The invention relates to the technical field of deep water communication, in particular to a magnetic antenna device for underwater ultra-low frequency signal reception. Background technique [0002] Ultra-low frequency (SLF) communication is currently the only deep-water communication technology in my country. Underwater vehicles use towed antennas to receive SLF radio signals underwater to achieve one-way communication between the surface and underwater vehicles. The towed antenna is an electric antenna. Although it can receive ultra-low frequency signals, the total length of the antenna is about several hundred meters. The main problems are as follows: [0003] 1. The towed antenna seriously affects the maneuverability of the underwater vehicle [0004] Since the towed antenna does not solve the problem of omnidirectional reception at present, the course of the underwater vehicle must be adjusted to the specified course when receiving letters, whic...

AI Technical Summary

Problems solved by technology

[0003] 1. The towed antenna seriously affects the maneuverability of the underwater vehicle

[0004] Since the towed antenna does not solve the problem of omnidirectional reception at present, the course of the underwater vehicle must be adjusted to the specified course when receiving letters, which has serious restrictions on the course of the underwater vehicle

After the towed antenna is released, it is in the wake of the underwater vehicle. Affected by the wake, the towed antenna swings, and the antenna generates electromagnetic interference noise, which affects the receiving quality of the underwater vehicle and limits the speed of the underwater vehicle when receiving signals.

[0005] 2. Towing antennas seriously affects the safety of underwater vehicles

[0006] The towed antenna system uses a winch mechanism for release and recovery, and the winch system emits noise during operation, increasing the possibility of acoustic exposure of the underwater vehicle

After the towed antenna is released, it is behind the underwater vehicle, with a length of up to 800m. Under special circumstances, it will collide with the tail structure such as the propeller and be entangled, and it is easy to be collided by trawlers, surface merchant ships, etc., causing damage to the underwater vehicle components.

The towed antenna and towed sonar conflict with each other when used. These two kinds of equipment cannot be used at the same time, otherwise the towed part will be entangled and pulled, or even fall off.

[0007] 3. Towing the antenna seriously affects the real-time performance of communication

However, when the receiving antenna is installed on the shell of the underwater vehicle, the noise of the underwater vehicle will greatly affect the signal-to-noise ratio at the receiving depth, so that the signal-to-noise ratio index does not meet the receiving requirements

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