CN-115987311-B - Underwater antenna low-frequency signal matching device

Abstract

The invention relates to the technical field of signal processing, in particular to an underwater antenna low-frequency signal matching device, wherein the receiving end of the device comprises three electromagnetic relays, the receiving ends of a first electromagnetic relay and a second electromagnetic relay are respectively connected with different magnetic antennas, and the receiving end of a third electromagnetic relay is connected with a horizontal electric antenna; each electromagnetic relay is powered by a regulated direct current power supply, and the control mode of the device is switched by controlling the contact of the electromagnetic relay; the electromagnetic relay is provided with different electromagnetic relays, so that signals of different magnetic antennas can be received simultaneously, and the function of simultaneously receiving signals of a single magnetic antenna channel and a magnetic antenna omni-directional synthetic channel can be realized; the low-frequency receiver is provided with a plurality of output channels, so that a plurality of low-frequency receivers with different functions can be used simultaneously, and the direct connection function of the antenna and the receiver is implemented when the matching sharing device is powered off; the magnetic antenna is utilized to simultaneously perform directional and omnidirectional reception, so that a communication blind area is avoided, and the communication reliability is improved.

Inventors

• LIU YONG
• XU RUI
• LI BEI
• CHEN LEI
• XIANG BING
• YE XUAN
• DING ZHONGYI
• ZHANG JIAQI
• YAO JINGWEI
• Duan Xuanyu

Assignees

• 武汉船舶通信研究所（中国船舶重工集团公司第七二二研究所）

Dates

Publication Date

20260512

Application Date

20220930

Claims (7)

1. 1. The underwater antenna low-frequency signal matching device is characterized in that the receiving end of the device comprises three electromagnetic relays, wherein the receiving ends of a first electromagnetic relay and a second electromagnetic relay are respectively connected with different magnetic antennas, the magnetic antennas comprise a first magnetic antenna and a second magnetic antenna, the receiving end of a third electromagnetic relay is connected with a horizontal electromagnetic antenna, each electromagnetic relay is powered by a voltage-stabilizing direct-current power supply, and the control mode of the device is switched by controlling the contact points of the electromagnetic relay; When the electromagnetic relay is powered on, the normally open contact is closed, each magnetic antenna and each horizontal electric antenna are respectively connected with the corresponding low-frequency matching amplifying unit, a low-frequency signal is output to the low-frequency signal receiving end through the corresponding low-frequency matching amplifying unit, and the control mode of the device is in remote control; When the electromagnetic relay is powered off, the normally closed contact is connected, each magnetic antenna and the horizontal electric antenna directly transmit the received signals to the low-frequency signal receiving end, the control mode of the device is in local control, and the device comprises four low-frequency signal output channels, wherein the four low-frequency signal output channels comprise: the normally open contact of the first electromagnetic relay is electrically connected with a first low-frequency matching amplifying circuit, and the output end of the first low-frequency matching amplifying circuit outputs a low-frequency signal through a first processing module to form a first low-frequency signal output channel; the normally open contact of the second electromagnetic relay is electrically connected with a second low-frequency matching amplifying circuit, and the output end of the second low-frequency matching amplifying circuit outputs a low-frequency signal through a second processing module to form a second low-frequency signal output channel; The output end of the first magnetic antenna is electrically connected with the first electromagnetic relay, the normally closed contact of the first electromagnetic relay is electrically connected with the first low-frequency receiver, the normally open contact of the first electromagnetic relay is electrically connected with the input end of the first low-frequency matching amplifying circuit, the output end of the first low-frequency matching amplifying circuit is electrically connected with the first all-pass phase-shifting network, and the first all-pass phase-shifting network is electrically connected with one receiving end of the synthesis amplifying circuit; The output end of the second magnetic antenna is electrically connected with the second electromagnetic relay, the normally closed contact of the second electromagnetic relay is electrically connected with the second low-frequency receiver, the normally open contact of the second electromagnetic relay is electrically connected with the input end of the second low-frequency matching amplifying circuit, the output end of the second low-frequency matching amplifying circuit is electrically connected with the second all-pass phase-shifting network, and the second all-pass phase-shifting network is electrically connected with the other receiving end of the composite amplifying circuit; The normally open contact of the third electromagnetic relay is electrically connected with a third low-frequency matching amplifying circuit, and the output end of the third low-frequency matching amplifying circuit outputs a low-frequency signal through a fourth processing module to form a fourth low-frequency signal output channel.
2. 2. An underwater antenna low frequency signal matching device as claimed in claim 1, wherein the device comprises a navigation signal output channel and an extremely low frequency signal output channel, comprising: The normally open contact of the third electromagnetic relay is electrically connected with a third low-frequency matching amplifying circuit, the other output end of the third low-frequency matching amplifying circuit is sequentially connected with an isolating circuit, a band-pass filter and an output matching circuit, and a navigation signal is output to form a navigation signal output channel; the other output end of the normally open contact of the third electromagnetic relay is electrically connected with an extremely low frequency matching circuit, a low pass filter, an extremely low frequency low noise amplifying circuit and an output matching circuit in sequence, and outputs extremely low frequency signals to form an extremely low frequency signal output channel.
3. 3. The underwater antenna low-frequency signal matching device according to claim 1, wherein in the first and third low-frequency signal output channels, the output ends of the first low-frequency matching amplifying circuit and the third low-frequency matching amplifying circuit are respectively electrically connected with an isolation circuit before being connected with the corresponding processing module, and are respectively connected with the processing module through the corresponding isolation circuits.
4. 4. A low frequency signal matching device for an underwater antenna according to claim 1 or 3, wherein said first to fourth processing modules each include a band pass filter and an output distribution circuit in said first to fourth low frequency signal output channels; Each output distribution circuit divides the signal output by the corresponding low-frequency signal output channel into four paths of low-frequency signals to the operation control circuit, and the operation control circuit simultaneously outputs each path of low-frequency signals to the corresponding low-frequency signal receiving end and controls any low-frequency signal receiving end to receive any path of low-frequency signals through the operation control circuit.
5. 5. The underwater antenna low-frequency signal matching device according to claim 2, wherein the input end of the third low-frequency matching amplifying circuit is electrically connected with a normally open contact of the third electromagnetic relay; the output end of the third low-frequency matching amplifying circuit is divided into two paths, one path forms a navigation signal output channel, and the other path forms a fourth low-frequency signal output channel after passing through a low-frequency band-pass filter.
6. 6. The underwater antenna low frequency signal matching apparatus as claimed in claim 4, wherein each input channel of each low frequency receiver is electrically connected to an output distribution circuit through an electromagnetic relay, and a single input channel receives any one of signals outputted from an output distribution circuit connected thereto; Each input channel of the low-frequency receiver corresponds to the first low-frequency signal output channel, the second low-frequency signal output channel, the third low-frequency signal output channel and the fourth low-frequency signal output channel respectively, and the normally open contact state of the electromagnetic relay is controlled through a control switch connected with a voltage-stabilizing direct-current power supply, so that the corresponding low-frequency signal output channel is selected.
7. 7. The underwater antenna low frequency signal matching device of claim 4, wherein the voltage of the direct current stabilized power supply is ±12v.

Description

Underwater antenna low-frequency signal matching device Technical Field The invention relates to the technical field of signal processing, in particular to an underwater antenna low-frequency signal matching device. Background The low-frequency signal can be transmitted in the waveguide formed by the earth and the ionized layer, has the characteristics of long transmission distance and stable signal, can penetrate deep sea water, and has the unique advantage of being less influenced by the magnetic storm and the ionized layer. Thus, low frequency signals are often used for underwater telecommunication and navigation. The low-frequency transmitting antenna has a huge structure and high transmitting power, if the receiving performance is to be improved, the transmitting power of the low-frequency transmitting antenna is generally required to be increased, the transmitting power is reduced by 24% when the signal to noise ratio is reduced by 1dB, and the transmitting power cannot be increased limitlessly. The increase of the transmitting power of the low-frequency transmitting antenna consumes extremely manpower, material resources and financial resources, and greatly increases the manufacturing, maintenance, research and development and use costs. The existing device can not meet the requirements of reducing the transmitting power of an antenna while improving the sharing capability of underwater weak signal matching and the performance of a low-frequency system, and is uneconomical and low in energy efficiency. Disclosure of Invention The invention provides an underwater antenna low-frequency signal matching device, which is used for solving the defects in the prior art, and the input end of the underwater antenna low-frequency signal matching device is respectively connected with a magnetic antenna and a horizontal electric antenna, so that the underwater antenna low-frequency signal matching device can be matched with the magnetic antenna and the horizontal electric antenna, the underwater weak signal matching receiving capacity is improved, the free switching of a plurality of low-frequency/very-low-frequency communication receivers and a Roland C navigation receiver for receiving different antenna signals is realized, and the receiving efficiency is improved. The invention provides an underwater antenna low-frequency signal matching device, the receiving end of which comprises three electromagnetic relays, wherein the receiving ends of a first electromagnetic relay and a second electromagnetic relay are respectively connected with different magnetic antennas, the magnetic antennas comprise a first magnetic antenna and a second magnetic antenna, and the receiving end of a third electromagnetic relay is connected with a horizontal electric antenna; When the electromagnetic relay is powered on, the normally open contact is closed, each magnetic antenna and each horizontal electric antenna are respectively connected with the corresponding low-frequency matching amplifying unit, a low-frequency signal is output to the low-frequency signal receiving end through the corresponding low-frequency matching amplifying unit, and the control mode of the device is in remote control; When the electromagnetic relay is powered off, the normally closed contact is connected, each magnetic antenna and the horizontal electric antenna directly transmit the received signals to the low-frequency signal receiving end, and the control mode of the device is in local control. Specifically, the device includes four low frequency signal output channels, including: the normally open contact of the first electromagnetic relay is electrically connected with a first low-frequency matching amplifying circuit, and the output end of the first low-frequency matching amplifying circuit outputs a low-frequency signal through a first processing module to form a first low-frequency signal output channel; the normally open contact of the second electromagnetic relay is electrically connected with a second low-frequency matching amplifying circuit, and the output end of the second low-frequency matching amplifying circuit outputs a low-frequency signal through a second processing module to form a second low-frequency signal output channel; The output end of the first magnetic antenna is electrically connected with the first electromagnetic relay, the normally closed contact of the first electromagnetic relay is electrically connected with the first low-frequency receiver, the normally open contact of the first electromagnetic relay is electrically connected with the input end of the first low-frequency matching amplifying circuit, the output end of the first low-frequency matching amplifying circuit is electrically connected with the first all-pass phase-shifting network, and the first all-pass phase-shifting network is electrically connected with one receiving end of the synthesis amplifying circuit; The output end of the second magnetic antenna is