An underwater antenna low frequency signal matching device

Abstract

The present application relates to the technical field of signal processing, in particular to a low-frequency signal matching device for underwater antenna, the receiving end of the device comprises three electromagnetic relays, the receiving end of the first electromagnetic relay and the second electromagnetic relay is connected with different magnetic antennas respectively, and the receiving end of the third electromagnetic relay is connected with a horizontal electric antenna; each electromagnetic relay is powered by a stabilized DC power supply, and the control mode of the device is switched by controlling the contact of the electromagnetic relay; the device can receive signals from different magnetic antennas simultaneously by setting different electromagnetic relays, and can realize the functions of simultaneously receiving single magnetic antenna channel and omnidirectional synthetic channel signals of magnetic antennas; multiple output channels are arranged, so that multiple low-frequency receivers with different functions can be used simultaneously, and the antenna and receiver can be directly connected when the matching diplexer is powered off; the magnetic antenna is used for directional and omnidirectional reception simultaneously, so that the communication blind area is avoided, and the communication reliability is improved.

Description

Technical Field

[0001] This invention relates to the field of signal processing technology, and in particular to a low-frequency signal matching device for an underwater antenna. Background Technology

[0002] Low-frequency signals can propagate through waveguides formed by the Earth and the ionosphere, exhibiting characteristics of long propagation distance, signal stability, and the ability to penetrate deep seawater. They also possess the unique advantage of being less affected by geomagnetic storms and the ionosphere. Therefore, low-frequency signals are commonly used for underwater long-distance communication and navigation.

[0003] Low-frequency (LHF) transmitting antennas are bulky and have high transmission power. To improve reception performance, it is usually necessary to increase the transmission power of the LHF transmitting antenna. Every 1 dB decrease in signal-to-noise ratio is equivalent to a 24% decrease in transmission power, and the transmission power cannot be increased indefinitely. Increasing the transmission power of LHF transmitting antennas is extremely costly in terms of manpower, material resources, and financial resources, and will greatly increase the costs of manufacturing, maintenance, research and development, and use.

[0004] Existing devices cannot simultaneously improve the ability to match and share weak underwater signals and enhance the performance of low-frequency systems while reducing the requirements for antenna transmission power, making them uneconomical and less energy efficient. Summary of the Invention

[0005] This invention provides an underwater antenna low-frequency signal matching device to overcome the deficiencies in the prior art. Its input terminals are connected to a magnetic antenna and a horizontal electric antenna, respectively, enabling matching with the magnetic antenna and the horizontal electric antenna, improving the underwater weak signal matching and reception capability, and allowing multiple low-frequency / ultra-low-frequency communication receivers and Roland C navigation receivers to freely switch between receiving different antenna signals, thereby improving reception efficiency.

[0006] This invention provides an underwater antenna low-frequency signal matching device. The receiving end of the device includes three electromagnetic relays. The receiving ends of the first and second electromagnetic relays are respectively connected to different magnetic antennas, including a first magnetic antenna and a second magnetic antenna. The receiving end of the third electromagnetic relay is connected to a horizontal electric antenna. Each electromagnetic relay is powered by a regulated DC power supply, and the control mode of the device is switched by controlling the contacts of the electromagnetic relays.

[0007] When the electromagnetic relay is energized, the normally open contact closes, and each magnetic antenna and horizontal electric antenna is connected to the corresponding low-frequency matching amplifier unit. The low-frequency signal is output to the low-frequency signal receiving end through the corresponding low-frequency matching amplifier unit. The control mode of the device is remote control.

[0008] When the electromagnetic relay is de-energized, the normally closed contact is closed, and each magnetic antenna and horizontal electric antenna directly transmits the received signal to the low-frequency signal receiving end. The control mode of the device is local control.

[0009] Specifically, the device includes four low-frequency signal output channels, including:

[0010] The normally open contact of the first electromagnetic relay is electrically connected to the first low-frequency matching amplifier circuit. The output terminal of the first low-frequency matching amplifier circuit outputs a low-frequency signal through the first processing module, forming the first low-frequency signal output channel.

[0011] The normally open contact of the second electromagnetic relay is electrically connected to the second low-frequency matching amplifier circuit. The output terminal of the second low-frequency matching amplifier circuit outputs a low-frequency signal through the second processing module, forming a second low-frequency signal output channel.

[0012] The output terminal of the first magnetic antenna is electrically connected to the first electromagnetic relay. The normally closed contact of the first electromagnetic relay is electrically connected to the first low-frequency receiver. The normally open contact of the first electromagnetic relay is electrically connected to the input terminal of the first low-frequency matching amplifier circuit. The output terminal of the first low-frequency matching amplifier circuit is electrically connected to the first all-pass phase-shifting network. The first all-pass phase-shifting network is electrically connected to one receiver terminal of the synthesizing amplifier circuit.

[0013] The output terminal of the second magnetic antenna is electrically connected to the second electromagnetic relay. The normally closed contact of the second electromagnetic relay is electrically connected to the second low-frequency receiver. The normally open contact of the second electromagnetic relay is electrically connected to the input terminal of the second low-frequency matching amplifier circuit. The output terminal of the second low-frequency matching amplifier circuit is electrically connected to the second all-pass phase-shifting network. The second all-pass phase-shifting network is electrically connected to the other receiving terminal of the combining amplifier circuit. The output terminal of the combining amplifier circuit outputs a low-frequency signal through the third processing module, forming a third low-frequency signal output channel.

[0014] The normally open contact of the third electromagnetic relay is electrically connected to the third low-frequency matching amplifier circuit. The output terminal of the third low-frequency matching amplifier circuit outputs a low-frequency signal through the fourth processing module, forming a fourth low-frequency signal output channel.

[0015] Specifically, the device includes a navigation signal output channel and an extremely low frequency signal output channel, comprising:

[0016] The normally open contact of the third electromagnetic relay is electrically connected to the third low-frequency matching amplifier circuit. The other output terminal of the third low-frequency matching amplifier circuit is sequentially connected to an isolation circuit, a bandpass filter, and an output matching circuit to output a navigation signal, thus forming the navigation signal output channel.

[0017] The other output terminal of the normally open contact of the third electromagnetic relay is sequentially connected to an ultra-low frequency matching circuit, a low-pass filter, an ultra-low frequency low-noise amplifier circuit, and an output matching circuit to output an ultra-low frequency signal, thus forming the ultra-low frequency signal output channel.

[0018] Specifically, in the first and third low-frequency signal output channels, the output terminals of the first low-frequency matching amplifier circuit and the third low-frequency matching amplifier circuit are respectively electrically connected to an isolation circuit before being connected to the corresponding processing module, and are then connected to the processing module via the corresponding isolation circuit.

[0019] Specifically, in the first to fourth low-frequency signal output channels, each of the first to fourth processing modules includes a bandpass filter and an output distribution circuit.

[0020] Each output distribution circuit divides the signal output from the corresponding low-frequency signal output channel into four low-frequency signals and sends them to the operation control circuit. The operation control circuit simultaneously outputs each low-frequency signal to the corresponding low-frequency signal receiving end, and controls any low-frequency signal receiving end to receive any low-frequency signal.

[0021] Specifically, the input terminal of the third low-frequency matching amplifier circuit is electrically connected to the normally open contact of the third electromagnetic relay;

[0022] The output of the third low-frequency matching amplifier circuit is divided into two paths. One path forms the navigation signal output channel, and the other path forms the fourth low-frequency signal output channel after passing through a low-frequency bandpass filter.

[0023] Specifically, each input channel of each of the low-frequency receivers is electrically connected to an output distribution circuit via an electromagnetic relay, and a single input channel receives any one of the signals output by the output distribution circuit connected to it;

[0024] 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. The normally open contact state of the electromagnetic relay is controlled by a control switch connected to a regulated DC power supply to select the corresponding low-frequency signal output channel.

[0025] Preferably, the voltage of the DC regulated power supply is ±12V.

[0026] The underwater antenna low-frequency signal matching device provided by this invention has the following technical effects:

[0027] (1) Improved the weak signal matching capability of the underwater low frequency antenna, improved the received signal by 15-20dB compared with no matching, and improved the signal by 5dB compared with impedance matching, and improved the antenna common device's ability to receive weak signals at the nanovolt level; it has multiple output channels, enabling multiple low frequency receivers with different functions to be used simultaneously, and implements the antenna and receiver direct connection function when the matching common device is powered off.

[0028] (2) It can simultaneously receive signals from different magnetic antennas and generate a 90° phase difference between the two signals through an all-pass phase-shifting network. After signal synthesis, it forms a low-frequency omnidirectional signal and can realize the function of simultaneously receiving signals from a single magnetic antenna channel and a magnetic antenna omnidirectional synthesis channel.

[0029] (3) The function has been expanded - it can simultaneously receive signals from magnetic antenna and horizontal electric antenna. The magnetic antenna receives signals with a frequency range of 10kHz-50kHz, while the horizontal electric antenna receives low-frequency communication signals with a frequency range of 10kHz-50kHz, low-frequency navigation signals with a frequency range of 80kHz-120kHz, and extremely low-frequency signals with a frequency range of 3Hz-300Hz. The magnetic antenna can be used to simultaneously receive signals in both directional and omnidirectional directions, avoiding communication blind spots and improving communication reliability.

[0030] (4) By utilizing the horizontal electric antenna, low-frequency signals (including communication signals and navigation signals) and extremely low-frequency signals can be received simultaneously, enabling the positioning of Loran C while communicating, thus opening up a new way for underwater radio positioning of Loran C. Attached Figure Description

[0031] To more clearly illustrate the technical solutions in this invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0032] Figure 1 This is one of the structural schematic diagrams of the underwater antenna low-frequency signal matching device provided by the present invention;

[0033] Figure 2 This is the second schematic diagram of the signal receiving module of the underwater antenna low-frequency signal matching device provided by the present invention. Detailed Implementation

[0034] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0035] The terms "comprising" and "having," and any variations thereof, in the specification, claims, and accompanying drawings of this application are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or apparatus that includes a series of steps or modules is not limited to the steps or modules listed, but may optionally include steps or modules not listed, or may optionally include other steps or modules inherent to such process, method, product, or apparatus.

[0036] It should be noted that the terms "first" and "second" used in this invention merely distinguish similar objects and do not represent a specific ordering of objects. It is understood that "first" and "second" can be interchanged in a specific order or sequence where permissible. It should be understood that the objects distinguished by "first" and "second" can be interchanged where appropriate so that the embodiments of the invention described herein can be implemented in orders other than those described or illustrated herein.

[0037] like Figure 1 As shown, in one embodiment, the present invention provides an underwater antenna low-frequency signal matching device. The receiving end of the device includes three electromagnetic relays, wherein the receiving ends of the first electromagnetic relay and the second electromagnetic relay are respectively connected to different magnetic antennas, and the receiving end of the third electromagnetic relay is connected to a horizontal electric antenna; each electromagnetic relay is powered by a regulated DC power supply, and the control mode of the device is switched by controlling the contacts of the electromagnetic relays.

[0038] When the electromagnetic relay is energized, the normally open contact closes, and each magnetic antenna and horizontal electric antenna is connected to the corresponding low-frequency matching amplifier unit. The low-frequency signal is output to the low-frequency signal receiving end through the corresponding low-frequency matching amplifier unit. The control mode of the device is remote control.

[0039] When the electromagnetic relay is de-energized, the normally closed contact is closed, and each magnetic antenna and horizontal electric antenna directly transmits the received signal to the low-frequency signal receiving end. The control mode of the device is local control.

[0040] The peripheral equipment includes two magnetic antennas I and II with identical performance parameters arranged symmetrically in a cross shape, and a horizontal electric antenna. The inductance of the magnetic antenna is 4mH.

[0041] Specifically, the device includes four low-frequency signal output channels, including:

[0042] The normally open contact of the first electromagnetic relay is electrically connected to the first low-frequency matching amplifier circuit. The output of the first low-frequency matching amplifier circuit outputs a low-frequency signal through the first processing module, forming the first low-frequency signal output channel. Figure 1 The magnetic antenna I channel is shown.

[0043] The normally open contact of the second electromagnetic relay is electrically connected to the second low-frequency matching amplifier circuit. The output of the second low-frequency matching amplifier circuit outputs a low-frequency signal through the second processing module, forming the second low-frequency signal output channel. Figure 1 The magnetic antenna channel II is shown.

[0044] The output terminal of the first magnetic antenna is electrically connected to the first electromagnetic relay. The normally closed contact of the first electromagnetic relay is electrically connected to the first low-frequency receiver. The normally open contact of the first electromagnetic relay is electrically connected to the input terminal of the first low-frequency matching amplifier circuit. The output terminal of the first low-frequency matching amplifier circuit is electrically connected to the first all-pass phase-shifting network. The first all-pass phase-shifting network is electrically connected to one receiver of the synthesizing amplifier circuit. The output terminal of the second magnetic antenna is electrically connected to the second electromagnetic relay. The normally closed contact of the second electromagnetic relay is electrically connected to the second low-frequency receiver. The normally open contact of the second electromagnetic relay is electrically connected to the input terminal of the second low-frequency matching amplifier circuit. The output terminal of the second low-frequency matching amplifier circuit is electrically connected to the second all-pass phase-shifting network. The second all-pass phase-shifting network is electrically connected to the other receiver of the synthesizing amplifier circuit. The output terminal of the synthesizing amplifier circuit outputs a low-frequency signal via a third processing module, forming a third low-frequency signal output channel. Figure 1 The magnetic antenna omnidirectional synthesis channel is shown.

[0045] The normally open contact of the third electromagnetic relay is electrically connected to the third low-frequency matching amplifier circuit. The output of the third low-frequency matching amplifier circuit outputs a low-frequency signal via the fourth processing module, forming the fourth low-frequency signal output channel. Figure 1 The horizontal electric antenna channel is shown.

[0046] Specifically, the device includes a navigation signal output channel and an extremely low frequency signal output channel, comprising:

[0047] The normally open contact of the third electromagnetic relay is electrically connected to the third low-frequency matching amplifier circuit. The other output terminal of the third low-frequency matching amplifier circuit is sequentially connected to an isolation circuit, a bandpass filter, and an output matching circuit to output a navigation signal, thus forming the navigation signal output channel.

[0048] The other output terminal of the normally open contact of the third electromagnetic relay is sequentially connected to an ultra-low frequency matching circuit, a low-pass filter, an ultra-low frequency low-noise amplifier circuit, and an output matching circuit to output an ultra-low frequency signal, thus forming the ultra-low frequency signal output channel.

[0049] Specifically, in the first and third low-frequency signal output channels, the output terminals of the first low-frequency matching amplifier circuit and the third low-frequency matching amplifier circuit are respectively electrically connected to an isolation circuit before being connected to the corresponding processing module, and are then connected to the processing module via the corresponding isolation circuit.

[0050] Specifically, in the first to fourth low-frequency signal output channels, each of the first to fourth processing modules includes a bandpass filter and an output distribution circuit.

[0051] Each output distribution circuit divides the signal output from the corresponding low-frequency signal output channel into four low-frequency signals and sends them to the operation control circuit. The operation control circuit simultaneously outputs each low-frequency signal to the corresponding low-frequency signal receiving end, and controls any low-frequency signal receiving end to receive any low-frequency signal.

[0052] Specifically, the input terminal of the third low-frequency matching amplifier circuit is electrically connected to the normally open contact of the third electromagnetic relay;

[0053] The output of the third low-frequency matching amplifier circuit is divided into two paths. One path forms the navigation signal output channel, and the other path forms the fourth low-frequency signal output channel after passing through a low-frequency bandpass filter.

[0054] In a specific embodiment, such as Figure 1 As shown, the device includes two low-frequency matching amplifier circuits, three isolation circuits, two all-pass phase-shifting networks, one synthesizing amplifier circuit, five band-pass filters, four output distribution circuits, one low-frequency matching circuit, one ultra-low-frequency matching circuit, one low-noise amplifier circuit, one low-pass filter, two output matching circuits, one operation control circuit, one regulated DC power supply, and three electromagnetic relays.

[0055] The magnetic antenna I, low-frequency matching amplifier circuit I, isolation circuit I, bandpass filter I, and output distribution circuit I are connected in sequence to form the first low-frequency signal output channel (i.e., the magnetic antenna I channel).

[0056] The magnetic antenna II, low-frequency matching amplifier circuit II, isolation circuit II, bandpass filter II and output distribution circuit II are connected in sequence to form the second low-frequency signal output channel (i.e., the magnetic antenna II channel).

[0057] Low-frequency matching amplifier circuits I and II are respectively as follows: Figure 2The circuit consists of a matching transformer and a low-noise amplifier. The primary inductance of the matching transformer is 40mH, and the low-noise amplifier has a high-impedance input with a noise voltage below 1.8nV / Hz1 / 2.

[0058] The low-frequency matching amplifier circuit exhibits high impedance characteristics compared to the magnetic antenna impedance, thereby obtaining the highest magnetic antenna induced voltage. The parameters of this invention can effectively obtain 90% of the magnetic antenna induced signal. Common impedance matching induced voltage is obtained by the magnetic antenna and the low-frequency matching amplifier sharing 50%, rather than obtaining the maximum input power.

[0059] Magnetic antenna I and all-pass phase-shifting network I are connected in sequence and then connected in parallel with magnetic antenna II and all-pass phase-shifting network II, which are connected in sequence. They are then connected in sequence with the synthesizing amplifier circuit, bandpass filter III and output distribution circuit III to form the third low-frequency signal output channel (i.e., the magnetic antenna omnidirectional synthesizing channel).

[0060] The horizontal electric antenna, low-frequency matching circuit, low-noise amplifier circuit, bandpass filter IV, and output distribution circuit IV are connected in sequence to form the fourth low-frequency signal output channel (i.e., the horizontal electric antenna channel).

[0061] A horizontal electric antenna, a low-frequency matching circuit, a low-noise amplifier circuit, an isolation circuit III, a bandpass filter V, and an output matching circuit I are connected in sequence to form a navigation signal output channel;

[0062] A horizontal electric antenna, an ultra-low frequency matching circuit, a low-pass filter, a low-noise amplifier circuit, and an output matching circuit II are connected in sequence to form an ultra-low frequency signal output channel.

[0063] Output distribution circuits I, II, III and IV divide each low-frequency signal output into 4 paths, enabling multiple low-frequency receivers to process the signals received by the signal antenna simultaneously;

[0064] In one specific embodiment, as an example, such as Figure 1 As shown, switching the control mode of the device of the present invention via an electromagnetic relay includes:

[0065] (1) When the regulated DC power supply is turned on, the present invention is in remote control mode:

[0066] When the electromagnetic relay KⅠ is energized, its normally open contact closes, and magnetic antenna Ⅰ and magnetic antenna Ⅱ are connected to their respective low-frequency matching amplifier circuits. The two signals from magnetic antenna Ⅰ and magnetic antenna Ⅱ are then sent to the output distribution circuit after passing through their respective isolation circuits and bandpass filters, each generating four equal-amplitude and mutually isolated signals. These signals are then simultaneously sent to four low-frequency receivers through the operation control circuit.

[0067] The bandpass filter has a bandwidth of 10-50kHz; the isolation circuit separates the low-frequency matching amplifier circuit and the bandpass filter to prevent the formation of a ground loop that could cause various interferences.

[0068] In order to obtain the omnidirectional reception function of the magnetic antenna, the signals of magnetic antenna I and magnetic antenna II after passing through their respective matching amplifier circuits are sent to the all-pass phase shifting network I and all-pass phase shifting network II respectively. The all-pass phase shifting network creates a fixed phase difference of 90° between the signals of magnetic antenna I and magnetic antenna II, which were originally in phase. After the two signals are sent to the combining amplifier circuit at the same time, the combined and amplified signals are processed by the bandpass filter III and then sent to the output distribution circuit III to generate four equal-amplitude and mutually isolated signals. These signals are sent to four low-frequency receivers at the same time through the operation control circuit.

[0069] Preferably, the bandwidth of the bandpass filter III is 10-50kHz.

[0070] When electromagnetic relay KⅡ is energized, its normally open contact closes, simultaneously connecting the horizontal electric antenna to both the low-frequency matching circuit and the ultra-low-frequency matching circuit. The low-frequency signal received by the horizontal electric antenna is amplified by the low-frequency matching circuit and then sent to bandpass filters IV and V. Bandpass filter IV filters out the communication signal, and bandpass filter V filters out the navigation signal. The navigation signal is sent to the Roland C receiver by output matching circuit I. The communication signal is distributed by output distribution circuit IV to generate four equal-amplitude, mutually isolated signals, which are simultaneously sent to four low-frequency receivers via the operation control circuit. The ultra-low-frequency signal received by the horizontal electric antenna is sent to output matching circuit II after passing through the ultra-low-frequency matching circuit, low-pass filter, and low-noise amplification circuit. The output of output matching circuit II is then sent to the ultra-low-frequency receiver.

[0071] Preferably, the bandwidth of the bandpass filter IV is 10-120kHz; the bandwidth of the bandpass filter V is 80-120kHz.

[0072] Operating control circuit such as Figure 2 As shown, the four low-frequency signal output channels (magnetic antenna I channel, magnetic antenna II channel, magnetic antenna combining channel, and horizontal electric antenna channel) output a total of 16 low-frequency signals. These signals are simultaneously sent to four low-frequency receivers through the operation control circuit. The operation control circuit enables a specific low-frequency receiver to receive one of the low-frequency signals.

[0073] (2) When the device provided by the present invention is in local control mode, that is, when the matching unit is powered off for some reason, the normally closed contacts of electromagnetic relays KⅠ and KⅡ are closed, and the signals received by magnetic antenna Ⅰ, magnetic antenna Ⅱ and horizontal electric antenna are directly sent to the input terminal of each receiver. Therefore, even if the power is off, the communication will not be interrupted.

[0074] It should be noted that the electromagnetic relay KⅠ in the figure includes electromagnetic relay KⅠ-1 and electromagnetic relay KⅠ-2, which are the first electromagnetic relay and the second electromagnetic relay, respectively.

[0075] Compared to electronic switches, electromagnetic relays offer higher isolation and generate significantly less additional noise.

[0076] Specifically, each input channel of each of the low-frequency receivers is electrically connected to an output distribution circuit via an electromagnetic relay, and a single input channel receives any one of the signals output by the output distribution circuit connected to it;

[0077] 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. The normally open contact state of the electromagnetic relay is controlled by a control switch connected to a regulated DC power supply to select the corresponding low-frequency signal output channel.

[0078] Specifically, such as Figure 2 As shown, as a further explanation of the present invention, the four low-frequency signal output channels output a total of 16 low-frequency signals. These signals are simultaneously sent to four low-frequency receivers through the operation control circuit. The operation control circuit enables a specific low-frequency receiver to receive one of the low-frequency signals.

[0079] For example Figure 2 The following example of an operation control circuit illustrates how to control low-frequency receiver I to receive different low-frequency signals:

[0080] The 16 low-frequency signals output by the output distribution circuit are all connected to four receivers via electromagnetic relays.

[0081] The four input channels 1-1, 1-2, 1-3, and 1-4 of the low-frequency receiver I are connected to the first signal of the output distribution circuit I, output distribution circuit II, output distribution circuit III, and output distribution circuit IV respectively through electromagnetic relays K1, K5, K9, and K13.

[0082] The four input channels 2-1, 2-2, 2-3, and 2-4 of the low-frequency receiver II are connected to the second signal of the output distribution circuit I, output distribution circuit II, output distribution circuit III, and output distribution circuit IV respectively through electromagnetic relays K2, K6, K10, and K14.

[0083] The four input channels 3-1, 3-2, 3-3, and 3-4 of the low-frequency receiver III are connected to the second signal of the output distribution circuit I, output distribution circuit II, output distribution circuit III, and output distribution circuit IV respectively through electromagnetic relays K3, K7, K11, and K15.

[0084] The four input channels 4-1, 4-2, 4-3, and 4-4 of the low-frequency receiver IV are connected to the second signal of the output distribution circuit I, output distribution circuit II, output distribution circuit III, and output distribution circuit IV respectively through electromagnetic relays K4, K8, K12, and K16.

[0085] When the control switch connected to the regulated DC power supply is connected to the 1-1 input channel of the low-frequency receiver I, the normally open contacts of electromagnetic relays K5, K9, and K13 cannot close because they are not energized, and the circuit is in an open circuit state. However, when electromagnetic relay K1 is energized and connected, the signal received by magnetic antenna I is sent to the input terminal of receiver I through electromagnetic relay K1. At this time, the low-frequency receiver I is working in the magnetic antenna I channel.

[0086] When the control switch connected to the regulated DC power supply is connected to input channel 1-2 of the low-frequency receiver I, the normally open contacts of electromagnetic relays K1, K9, and K13 cannot close because they are not energized, and the circuit is in an open circuit state. However, when electromagnetic relay K5 is energized, the signal received by magnetic antenna II is sent to the input terminal of low-frequency receiver I through electromagnetic relay K5. At this time, low-frequency receiver I is working in the magnetic antenna II channel.

[0087] When the control switch connected to the regulated DC power supply is connected to input channels 1-3 of receiver I, electromagnetic relays K1, K5, and K13 are not energized, so their normally open contacts cannot close, and the circuit is in an open circuit state. However, electromagnetic relay K9 is energized and connected, and the signal from the omnidirectional channel is sent to the input terminal of low-frequency receiver I through electromagnetic relay K9. At this time, low-frequency receiver I is working in the omnidirectional receiving channel.

[0088] When the control switch connected to the regulated DC power supply is connected to input channels 1-4 of receiver I, electromagnetic relays K1, K5, and K9 are not energized, so their normally open contacts cannot close, and the circuit is in an open circuit state. Meanwhile, electromagnetic relay K13 is turned on, and the first signal of the towed channel is sent to the input terminal of receiver I through electromagnetic relay K13. At this time, receiver I is working in the towed channel.

[0089] Optionally, the operation control circuit can be implemented using either combinational logic circuits or sequential circuits. Considering the reliability of the control, combinational logic circuits implemented using HTL devices can be selected to reduce the impact of interference pulses.

[0090] When the present invention is in local control mode, that is, when the underwater antenna low-frequency weak signal matching unit is powered off for some reason, the normally closed contacts of electromagnetic relays KⅠ and KⅡ are closed, and the signals received by magnetic antenna Ⅰ, magnetic antenna Ⅱ and horizontal electric antenna are directly sent to the input terminal of each receiver. Therefore, even if the power is off, the communication will not be interrupted.

[0091] Preferably, the voltage of the DC regulated power supply is ±12V.

[0092] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the modules can be selected to achieve the purpose of this embodiment according to actual needs. Those skilled in the art can understand and implement this without any creative effort.

[0093] Through the above description of the embodiments, those skilled in the art can clearly understand that each embodiment can be implemented by means of software plus necessary general-purpose hardware platforms, and of course, it can also be implemented by hardware. Based on this understanding, the above technical solutions, in essence or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, magnetic disk, optical disk, etc., and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute the methods described in the various embodiments or some parts of the embodiments.

[0094] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A low-frequency signal matching device for an underwater antenna, characterized in that, The receiving end of the device includes three electromagnetic relays, wherein the receiving ends of the first and second electromagnetic relays are respectively connected to different magnetic antennas, the magnetic antennas including the first magnetic antenna and the second magnetic antenna, and the receiving end of the third electromagnetic relay is connected to a horizontal electric antenna; each electromagnetic relay is powered by a regulated DC power supply, and the control mode of the device is switched by controlling the contacts of the electromagnetic relays. When the electromagnetic relay is energized, the normally open contact closes, and each magnetic antenna and horizontal electric antenna is connected to the corresponding low-frequency matching amplifier unit. The low-frequency signal is output to the low-frequency signal receiving end through the corresponding low-frequency matching amplifier unit. The control mode of the device is remote control. When the electromagnetic relay is de-energized, the normally closed contact is closed, and each magnetic antenna and horizontal electric antenna directly transmits the received signal to the low-frequency signal receiving end. The control mode of the device is local control. The device includes four low-frequency signal output channels, including: The normally open contact of the first electromagnetic relay is electrically connected to the first low-frequency matching amplifier circuit. The output terminal of the first low-frequency matching amplifier circuit outputs a low-frequency signal through the first processing module, forming the first low-frequency signal output channel. The normally open contact of the second electromagnetic relay is electrically connected to the second low-frequency matching amplifier circuit. The output terminal of the second low-frequency matching amplifier circuit outputs a low-frequency signal through the second processing module, forming a second low-frequency signal output channel. The output terminal of the first magnetic antenna is electrically connected to the first electromagnetic relay. The normally closed contact of the first electromagnetic relay is electrically connected to the first low-frequency receiver. The normally open contact of the first electromagnetic relay is electrically connected to the input terminal of the first low-frequency matching amplifier circuit. The output terminal of the first low-frequency matching amplifier circuit is electrically connected to the first all-pass phase-shifting network. The first all-pass phase-shifting network is electrically connected to one receiver terminal of the synthesizing amplifier circuit. The output terminal of the second magnetic antenna is electrically connected to the second electromagnetic relay. The normally closed contact of the second electromagnetic relay is electrically connected to the second low-frequency receiver. The normally open contact of the second electromagnetic relay is electrically connected to the input terminal of the second low-frequency matching amplifier circuit. The output terminal of the second low-frequency matching amplifier circuit is electrically connected to the second all-pass phase-shifting network. The second all-pass phase-shifting network is electrically connected to the other receiving terminal of the combining amplifier circuit. The output terminal of the combining amplifier circuit outputs a low-frequency signal through the third processing module, forming a third low-frequency signal output channel. The normally open contact of the third electromagnetic relay is electrically connected to the third low-frequency matching amplifier circuit. The output terminal of the third low-frequency matching amplifier circuit outputs a low-frequency signal through the fourth processing module, forming a fourth low-frequency signal output channel.

2. The underwater antenna low-frequency signal matching device according to claim 1, characterized in that, The device includes a navigation signal output channel and an extremely low frequency signal output channel, including: The normally open contact of the third electromagnetic relay is electrically connected to the third low-frequency matching amplifier circuit. The other output terminal of the third low-frequency matching amplifier circuit is sequentially connected to an isolation circuit, a bandpass filter, and an output matching circuit to output a navigation signal, thus forming the navigation signal output channel. The other output terminal of the normally open contact of the third electromagnetic relay is sequentially connected to an ultra-low frequency matching circuit, a low-pass filter, an ultra-low frequency low-noise amplifier circuit, and an output matching circuit to output an ultra-low frequency signal, thus forming the ultra-low frequency signal output channel.

3. The underwater antenna low-frequency signal matching device according to claim 1, characterized in that, In the first and third low-frequency signal output channels, the output terminals of the first low-frequency matching amplifier circuit and the third low-frequency matching amplifier circuit are respectively electrically connected to an isolation circuit before being connected to the corresponding processing module, and are then connected to the processing module via the corresponding isolation circuit.

4. A low-frequency signal matching device for an underwater antenna according to claim 1 or 3, characterized in that, In the first to fourth low-frequency signal output channels, each of the first to fourth processing modules includes a bandpass filter and an output distribution circuit. Each output distribution circuit divides the signal output from the corresponding low-frequency signal output channel into four low-frequency signals and sends them to the operation control circuit. The operation control circuit simultaneously outputs each low-frequency signal to the corresponding low-frequency signal receiving end, and controls any low-frequency signal receiving end to receive any low-frequency signal.

5. The underwater antenna low-frequency signal matching device according to claim 2, characterized in that, The input terminal of the third low-frequency matching amplifier circuit is electrically connected to the normally open contact of the third electromagnetic relay. The output of the third low-frequency matching amplifier circuit is divided into two paths. One path forms the navigation signal output channel, and the other path forms the fourth low-frequency signal output channel after passing through a low-frequency bandpass filter.

6. The underwater antenna low-frequency signal matching device according to claim 4, characterized in that, Each input channel of each low-frequency receiver is electrically connected to an output distribution circuit via an electromagnetic relay. Each input channel receives any signal output by the output distribution circuit connected to it. 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. The normally open contact state of the electromagnetic relay is controlled by a control switch connected to a regulated DC power supply to select the corresponding low-frequency signal output channel.

7. The underwater antenna low-frequency signal matching device according to claim 4, characterized in that, The voltage of the DC regulated power supply is ±12V.

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