CN115902850A - Method for reducing electronic noise of transmitting and receiving combined sonar system by utilizing nonlinear device - Google Patents
Method for reducing electronic noise of transmitting and receiving combined sonar system by utilizing nonlinear device Download PDFInfo
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- CN115902850A CN115902850A CN202211209505.XA CN202211209505A CN115902850A CN 115902850 A CN115902850 A CN 115902850A CN 202211209505 A CN202211209505 A CN 202211209505A CN 115902850 A CN115902850 A CN 115902850A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
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Abstract
The invention discloses a method for reducing electronic noise of a receiving and transmitting combined sonar system by utilizing a nonlinear device, which belongs to the technical field of reducing electronic noise and comprises the following steps: s1: the transmitter outputs a high-power alternating-current voltage signal according to a set period and a set pulse width; s2: the transducer Z1 converts the received alternating voltage signal into an acoustic signal and emits sound into water through the sound-transmitting rubber of the acoustic array; s3: during non-transmitting periods, the acoustic array receives acoustic reflections from the target, and transducer Z1 converts the received acoustic signals into voltage signals that are sent to receiver port IN1 for processing by a receiver to detect and identify the target signal. And a second-stage noise signal blocking link mainly comprising 2 anti-parallel semiconductor diodes is arranged, so that the interference of the output noise of the transmitter on the input end of the receiver connected to the transducer at the same time during non-transmitting period is more effectively reduced.
Description
Technical Field
The invention relates to the technical field of reducing electronic noise, in particular to a method for reducing electronic noise of a transmitting-receiving combined sonar system by utilizing a nonlinear device and a using method thereof.
Background
For some space-limited carriers, such as small underwater vehicles, underwater weapons and other equipment, sonar systems are usually configured to be shared by receiving and transmitting transducers (i.e. receiving and transmitting combined positions), the sonar systems are used as transmitting transducers during transmitting, and used as receiving transducers during non-transmitting, so that precious installation space can be saved, and the space and surface utilization rate of the carriers can be improved. For sonar systems employing a combination of transmitting and receiving transducers, the transmitter output and the receiver input must inevitably be connected to the transducers, and transmitter noise must necessarily affect the receiver input during non-transmission periods. In the past equipment, a primary nonlinear device is adopted to block the noise of the transmitter, and a solid-state relay is used for short-circuiting the output end of the transmitter to the circuit ground during the non-transmitting period.
Disclosure of Invention
The present invention is directed to a method for reducing electronic noise of a sonar transmitting/receiving system using a nonlinear device and a method for using the same, so as to solve the above-mentioned problems in the background art.
In order to achieve the purpose, the invention provides the following technical scheme: a method for reducing electronic noise of a transmitting-receiving sonar system by using a nonlinear device comprises the following steps:
s1: the transmitter outputs a high-power alternating voltage signal according to a set period and a set pulse width, and the alternating voltage signal output by the port of the transmitter PA1 is applied to the transducer Z1 through the noise reduction circuit;
s2: the transducer Z1 converts the received alternating voltage signal into an acoustic signal and transmits the acoustic signal to water through the sound-transmitting rubber of the acoustic array, and during the transmission of the transmitter, the amplification channel IN1 of the receiver is closed;
s3: during non-transmitting periods, the acoustic array receives acoustic reflections from the target, and transducer Z1 converts the received acoustic signals into voltage signals that are sent to receiver port IN1 for processing by a receiver to detect and identify the target signal.
Further, in step S1, the noise reduction circuit includes two sets of anti-parallel semiconductor diodes, a matching transformer T1, a noise absorption resistor R1, and a matching inductor L1, where the two sets of anti-parallel semiconductor diodes are respectively composed of semiconductor diodes D1, D2 and semiconductor diodes D3, D4;
the PA1 port of the transmitter is connected with one end of anti-parallel semiconductor diodes D1 and D2, and the other end of the anti-parallel semiconductor diodes D1 and D2 is connected to a primary coil of a matching transformer T1;
one end of each of the anti-parallel semiconductor diodes D3 and D4 is connected with the noise absorption resistor R1 and the secondary coil of the matching transformer T1 IN parallel, the other end of each of the anti-parallel semiconductor diodes D3 and D4 is connected with the matching inductor L1 IN series and the transducer Z1 IN series and connected with the receiver port IN1, one end of each of the resistor R1 and the transducer Z1 is connected with the secondary coil of the matching transformer T1, and the other end of each of the resistor R1 and the transducer Z1 is connected with the grounding end of the receiver.
Further, the turn ratio of the primary coil and the secondary coil of the matching transformer T1 is: 1:10.
further, the two sets of anti-parallel semiconductor diodes have nonlinear volt-ampere characteristics, and when the amplitude of the noise output by the transmitter does not exceed 0.3V during non-transmission, the two sets of anti-parallel semiconductor diodes block the noise signal.
Further, the noise absorption resistor R1 is used in cooperation with the anti-parallel semiconductor diodes D1 and D2 for attenuation of the noise signal, and the anti-parallel semiconductor diodes D3 and D4 are used for further attenuation of the noise signal under the impedance action of the matching inductor L1 and the transducer Z1.
Further, the antiparallel semiconductor diodes D3, D4 pass a smaller current than the antiparallel semiconductor diodes D1, D2, and in order to reduce the influence of the diode junction capacitance, the antiparallel semiconductor diodes D3, D4 are devices having a smaller rated current than the antiparallel semiconductor diodes D1, D2.
Compared with the prior art, the invention has the beneficial effects that:
the invention provides a method for reducing electronic noise of a receiving and transmitting combined sonar system by utilizing a nonlinear device, which is characterized in that a secondary noise signal blocking link mainly comprising 2 anti-parallel semiconductor diodes is arranged on a transmission path from the output end of a transmitter of the receiving and transmitting transducer combined sonar system to a transmitting signal of a transducer, so that the interference of the output noise of the transmitter to the input end of a receiver is reduced, and the interference of the output noise of the transmitter to the input end of the receiver simultaneously connected to the transducer during non-transmitting period is effectively reduced.
Drawings
FIG. 1 is an electrical schematic diagram of an embodiment of the present invention for reducing electronic noise in a sonar system with a transmitting and receiving transducer using a nonlinear device;
FIG. 2 is a graph of the frequency characteristics of the Z1 impedance mode of the transducer of the present invention;
FIG. 3 is a graph of the frequency characteristics of the impedance phase angle of the transducer Z1 of the present invention;
FIG. 4 is a frequency plot of the effect of transmitter output noise on the receiver input without the use of a non-linear device in accordance with the present invention;
FIG. 5 is a frequency plot of the effect of transmitter output noise on receiver input according to the present invention;
FIG. 6 is a second electrical schematic diagram of an embodiment of the present invention for reducing electronic noise in a sonar system with a receiving transducer and a transmitting transducer using a nonlinear device;
fig. 7 is a three electrical schematic diagrams of an embodiment of the method for reducing electronic noise of a sonar system with a receiving transducer and a transmitting transducer by using a nonlinear device according to the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In order to solve the problem that the transmitter output and the receiver input of the existing sonar system adopting the combined receiving and transmitting transducer are inevitably connected to the transducer, and the noise of the transmitter inevitably affects the input of the receiver during non-transmitting period. In the past, some devices adopt a first-stage nonlinear device to block transmitter noise, and some devices short-circuit the transmitter output end to the circuit ground by using a solid-state relay during non-transmission periods, and the following specific embodiments are given.
The first embodiment is as follows:
FIG. 1 shows an electrical schematic diagram, which may be part of a 1-set combined sonar system with receiving and transmitting transducers, in which such a circuit may have multiple paths, transmitter stands for Transmitter and Receiver;
there is always some unwanted noise at the transmitter output port during non-transmission due to various reasons, such as the presence of noise sources such as transmitter power supply noise, noise in the transmitter circuitry itself, etc. For the sonar system combining the receiving transducer and the transmitting transducer, the noise is transmitted to the transducer and is transmitted to the input port of the receiver together with the target signal, and the signal-to-noise ratio and the detection capability of the system are reduced.
A method for reducing electronic noise of a transmitting and receiving combined sonar system by using a nonlinear device comprises the following steps:
the method comprises the following steps: the transmitter outputs a high-power alternating voltage signal according to a set period and a set pulse width, and the alternating voltage signal output by the port of the transmitter PA1 is applied to the transducer Z1 through the noise reduction circuit;
the noise reduction circuit comprises two groups of anti-parallel semiconductor diodes, a matching transformer T1, a noise absorption resistor R1 and a matching inductor L1, wherein the two groups of anti-parallel semiconductor diodes respectively consist of semiconductor diodes D1 and D2 and semiconductor diodes D3 and D4;
the PA1 port of the transmitter is connected with one end of an anti-parallel semiconductor diode D1, D2, and the other end of the anti-parallel semiconductor diode D1, D2 is connected with a primary coil of a matching transformer T1;
one end of each of the anti-parallel semiconductor diodes D3 and D4 is connected with the noise absorption resistor R1 and the secondary coil of the matching transformer T1 IN parallel, the other end of each of the anti-parallel semiconductor diodes D3 and D4 is connected with the matching inductor L1 and the transducer Z1 IN series and is connected with the receiver port IN1, one end of each of the resistor R1 and the transducer Z1 is connected with the secondary coil of the matching transformer T1, and the other end of each of the resistor R1 and the transducer Z1 is connected with the grounding end of the receiver.
The turn ratio of the primary coil and the secondary coil of the matching transformer T1 is as follows: 1:10.
the two sets of anti-parallel semiconductor diodes have non-linear volt-ampere characteristics, and when the amplitude of the noise output by the transmitter does not exceed 0.3V during non-transmission, the two sets of anti-parallel semiconductor diodes block the noise signal.
The noise absorption resistor R1 is used in cooperation with the anti-parallel semiconductor diodes D1 and D2 for attenuation of noise signals, and the anti-parallel semiconductor diodes D3 and D4 are used for further attenuation of noise signals under the impedance action of the matching inductor L1 and the transducer Z1.
The anti-parallel semiconductor diodes D3 and D4 pass smaller current than the anti-parallel semiconductor diodes D1 and D2, and in order to reduce the influence of diode junction capacitance, the anti-parallel semiconductor diodes D3 and D4 are devices with smaller rated current than the anti-parallel semiconductor diodes D1 and D2.
Step two: the transducer Z1 converts the received alternating voltage signal into an acoustic signal and transmits the acoustic signal to water through the sound-transmitting rubber of the acoustic array, and during the transmitting period of the transmitter, the amplifying channel IN1 of the receiver is closed;
step three: during non-transmission periods, the acoustic array receives acoustic reflections from the target, transducer Z1 converts the received acoustic signals into voltage signals, which are sent to receiver port IN1 for processing by the receiver to detect and identify the target signal.
FIGS. 2 and 3 are graphs of the impedance mode and the impedance phase angle frequency of transducer Z1, with a resonant point frequency of 16.218kHz, an impedance mode of 852 Ω, an impedance mode of 1.793k Ω at 20kHz, an anti-resonant point frequency of 24.831kHz, and an impedance mode of 3.754k Ω.
Fig. 4 shows the noise response curve of the input end of the receiving and transmitting transducer combined sonar system to the output end of the transmitter when the nonlinear device is not adopted and the transducer has the characteristics of fig. 2, and the noise response curve has 19dB amplification at the frequency point of 20 kHz.
And when the transducer has the characteristics of fig. 2, fig. 5 shows that when the nonlinear device is not adopted, the noise response curve of the input end of the receiving and transmitting transducer combined sonar system receiver to the output end of the transmitter has-100.5 dB amplification at the frequency point of 20kHz, and is reduced by 119.5dB compared with the noise response curve when the nonlinear device is not adopted.
The above attenuation is effective only for noise signals of small amplitude. Due to the nonlinear characteristic of the semiconductor diode, the semiconductor diode enters a conducting state when the voltage amplitude is larger than 0.7V, and the attenuation of a transmission signal with dozens of amplitudes is small.
In conclusion, the method has good effect of inhibiting the electronic noise at the output end of the transmitter of the sonar system with the combined receiving and transmitting transducer, and can ensure that the normal transmitting signal is not influenced.
Example two:
referring to fig. 6, a PA1 port of the transmitter is connected to one end of the anti-parallel semiconductor diodes D1 and D2, the other end of the anti-parallel semiconductor diodes D1 and D2 is connected in parallel to the anti-parallel semiconductor diodes D3 and D4 and the noise absorption resistor R1, and the anti-parallel semiconductor diodes D3 and D4 and the noise absorption resistor R1 are connected to the primary coil of the matching transformer T1;
the secondary winding of the matching transformer T1 is connected to the matching inductor L1 and the transducer Z1, and the matching inductor L1 and the transducer Z1 are connected IN parallel to the receiver port IN 1.
Example three:
referring to fig. 7, a PA1 port of the transmitter is connected to a primary coil of a matching transformer T1, a secondary coil of the matching transformer T1 is connected to anti-parallel semiconductor diodes D1 and D2, a noise absorption resistor R1 and a transducer Z1, the other ends of the noise absorption resistor R1 and the anti-parallel semiconductor diodes D1 and D2 are connected to anti-parallel semiconductor diodes D3 and D4, and the anti-parallel semiconductor diodes D3 and D4, a matching inductor L1 and the transducer Z1 are connected IN parallel to a receiver port IN 1.
The second and third embodiments show two other circuit forms of the present invention, which both use the anti-parallel semiconductor diode as the main noise blocking link, but only change the blocking position on the noise transmission channel (certainly, the transmission channel of the transmission signal).
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be able to cover the technical solutions and the inventive concepts of the present invention within the technical scope of the present invention.
Claims (6)
1. A method for reducing electronic noise of a transmitting and receiving combined sonar system by using a nonlinear device is characterized by comprising the following steps:
s1: the transmitter outputs a high-power alternating voltage signal according to a set period and a set pulse width, and the alternating voltage signal output by the port of the transmitter PA1 is applied to the transducer Z1 through the noise reduction circuit;
s2: the transducer Z1 converts the received alternating voltage signal into an acoustic signal and transmits the acoustic signal to water through the sound-transmitting rubber of the acoustic array, and during the transmitting period of the transmitter, the amplifying channel IN1 of the receiver is closed;
s3: during non-transmitting periods, the acoustic array receives acoustic reflections from the target, and transducer Z1 converts the received acoustic signals into voltage signals that are sent to receiver port IN1 for processing by a receiver to detect and identify the target signal.
2. The method for reducing electronic noise of a sonar system using a non-linear device according to claim 1, wherein the noise reduction circuit includes two sets of anti-parallel semiconductor diodes, a matching transformer T1, a noise absorption resistor R1, and a matching inductor L1, wherein the two sets of anti-parallel semiconductor diodes are respectively composed of semiconductor diodes D1 and D2 and semiconductor diodes D3 and D4;
the PA1 port of the transmitter is connected with one end of an anti-parallel semiconductor diode D1, D2, and the other end of the anti-parallel semiconductor diode D1, D2 is connected with a primary coil of a matching transformer T1;
one end of each of the anti-parallel semiconductor diodes D3 and D4 is connected with the noise absorption resistor R1 and the secondary coil of the matching transformer T1 IN parallel, the other end of each of the anti-parallel semiconductor diodes D3 and D4 is connected with the matching inductor L1 IN series and the transducer Z1 IN series and connected with the receiver port IN1, one end of each of the resistor R1 and the transducer Z1 is connected with the secondary coil of the matching transformer T1, and the other end of each of the resistor R1 and the transducer Z1 is connected with the grounding end of the receiver.
3. The method for reducing electronic noise of a sonar system using a non-linear device according to claim 2, wherein the matching transformer T1 has a primary winding to secondary winding turns ratio of: 1:10.
4. the method for reducing electronic noise of a sonar system using a non-linear device according to claim 2, wherein the two sets of anti-parallel semiconductor diodes have a non-linear current-voltage characteristic, and block noise signals when the amplitude of noise output from the transmitter does not exceed 0.3V during non-transmission.
5. A method of using nonlinear devices to reduce electronic noise in a combined sonar system as defined in claim 2 wherein noise absorbing resistor R1 is used in conjunction with anti-parallel semiconductor diodes D1, D2 for noise signal attenuation and anti-parallel semiconductor diodes D3, D4 are used for further noise signal attenuation under the impedance of matching inductor L1 and transducer Z1.
6. A method of reducing electronic noise in a combined sonar system using a non-linear device according to claim 2, wherein the anti-parallel semiconductor diodes D3, D4 pass less current than the anti-parallel semiconductor diodes D1, D2, and wherein the anti-parallel semiconductor diodes D3, D4 are selected to have a current rating less than the current rating of the anti-parallel semiconductor diodes D1, D2 in order to reduce the effect of diode junction capacitance.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202211209505.XA CN115902850A (en) | 2022-09-30 | 2022-09-30 | Method for reducing electronic noise of transmitting and receiving combined sonar system by utilizing nonlinear device |
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| CN202211209505.XA CN115902850A (en) | 2022-09-30 | 2022-09-30 | Method for reducing electronic noise of transmitting and receiving combined sonar system by utilizing nonlinear device |
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| CN115902850A true CN115902850A (en) | 2023-04-04 |
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| CN202211209505.XA Pending CN115902850A (en) | 2022-09-30 | 2022-09-30 | Method for reducing electronic noise of transmitting and receiving combined sonar system by utilizing nonlinear device |
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