CN218041403U - Air-to-water cross-medium laser induced acoustic communication device - Google Patents
Air-to-water cross-medium laser induced acoustic communication device Download PDFInfo
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- CN218041403U CN218041403U CN202222203810.XU CN202222203810U CN218041403U CN 218041403 U CN218041403 U CN 218041403U CN 202222203810 U CN202222203810 U CN 202222203810U CN 218041403 U CN218041403 U CN 218041403U
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Abstract
The utility model belongs to the technical field of cross medium communication technology and specifically relates to a can adapt to air of aerial platform and underwater communication demand and stride medium laser to water and send sound communication device, a serial communication port is equipped with the industrial computer, the industrial computer links to each other with pulse laser, pulse laser's output links to each other with 1 × 2 spectroscope, 1 × 2 spectroscope output of all the way gets into the energy gauge, another way output is through plane mirror back vertical incidence aqueous vapor interface face, make laser pulse signal convert the acoustic signal and propagate under water into, the hydrophone that is located under water receives acoustic signal, the output of hydrophone links to each other with signal processing circuit, signal processing circuit's control end links to each other with the industrial computer, compare with prior art, can adapt to the abominable condition of sea communication channel before, show the error rate that falls, and then improve communication quality.
Description
The technical field is as follows:
the utility model belongs to the technical field of cross medium communication technique and specifically relates to a can adapt to air of communication demand between aerial platform and the underwater target and cross medium laser to water and send acoustic communication device.
The background art comprises the following steps:
the position of sea-air integrated communication in future war and national economic production is increasingly prominent, and the laser acoustic communication technology between the aerial platform and the underwater target is an important component for constructing sea-air integration, and the water surface communication relay can be removed, so that the direct communication between the aerial platform and the underwater target is realized. The severe conditions of the underwater acoustic channel, particularly the shallow sea channel, are represented by the complexity, random variability and limited bandwidth of the channel, and the influence of sea water boundaries, ocean power factors, space-time variation, noise and the like on the signal transmission.
The invention content is as follows:
the utility model discloses shortcoming and not enough to exist among the prior art, provided one kind and can improve the air and cross medium communication quality's air to water and cross medium laser and send the acoustic communication device.
The invention is achieved by the following measures:
the utility model provides an air is to water and is crossed medium laser and send sound communication device which characterized in that is equipped with the industrial computer, the industrial computer links to each other with pulse laser, pulse laser's output links to each other with 1 x 2 beam splitter, 1 x 2 beam splitter's output gets into the energy meter all the way, another way output through the plane mirror after-reflection perpendicular incidence aqueous vapor interface, make laser pulse signal convert the acoustic signal and propagate under water, the hydrophone that is located under water receives the acoustic signal, the output of hydrophone links to each other with signal processing circuit, signal processing circuit's control end links to each other with the industrial computer.
The laser is Nd: YAG laser.
The energy meter is a laser energy monitor for detecting the energy of each laser pulse.
The utility model discloses still be equipped with microphone and AD converting circuit who is used for gathering sound signal for convert the speech signal that the microphone was received into digital signal, and send into pulse laser.
The signal processing circuit includes first band pass filter and second band pass filter, wherein first band pass filter is different with second band pass filter's operating frequency band, first band pass filter output links to each other with full wave rectifier circuit, full wave rectifier circuit's output links to each other with low pass filter, second band pass filter's output links to each other with another way full wave rectifier circuit, full wave rectifier circuit's output links to each other with another low pass filter, the signal of two way low pass filter outputs is after the superpose of superposer, send into the sampling decision ware again to obtain former signal information.
The utility model discloses at the during operation, utilize the microphone to gather voice signal, and send voice signal into AD converting circuit and carry out the AD conversion, the digital signal after the conversion sends into pulse laser after through the code, the transmission repetition frequency of control laser produces the acoustic signal, the adjustment transmission repetition rate makes laser sound signal narrowband characteristic best in this process, and make the strong and higher harmonic suppression nature of center frequency department energy, obtain the high repetition rate scope of pulse laser, select several modulation frequency from the repetition frequency within range that satisfies the condition; a light beam output by the pulse laser is divided into two beams after passing through the beam splitter, wherein one beam enters the laser energy monitor with 2% of energy so as to detect the energy of each laser pulse; the other beam is reflected by the plane mirror and vertically enters a water-gas interface, laser energy is focused to generate a thermal expansion effect, and then a laser pulse signal is converted into an acoustic signal to be transmitted to each direction underwater; the acoustic signal is transmitted through an underwater acoustic channel, is received by a hydrophone at a signal receiving end, is converted into an electric signal and is transmitted to a signal processing circuit, and the signal processing circuit demodulates the signal and sends the signal to an industrial personal computer for subsequent processing.
Compared with the prior art, the utility model, sea communication channel adverse conditions before can adapting to is showing the error rate that falls, and then improves communication quality.
Description of the drawings:
fig. 1 is a schematic structural diagram of the present invention.
Fig. 2 is a schematic structural diagram of the signal processing circuit of the present invention.
Reference numerals: the device comprises an industrial personal computer 1, a pulse laser 2, a light splitter 3, an energy meter 4, a plane mirror 5, a hydrophone 6, a signal processing circuit 7, a first band-pass filter 8, a second band-pass filter 9, a full-wave rectifying circuit 10, a low-pass filter 11, a sampling decision device 12, a microphone 13 and an A/D conversion circuit 14.
The specific implementation mode is as follows:
the present invention will be further described with reference to the accompanying drawings and examples.
Example (b):
as shown in fig. 1, this example provides an air-to-water cross-medium laser acoustic communication device, which is provided with an industrial personal computer 1, wherein the industrial personal computer 1 is connected with a pulse laser 2, an output end of the pulse laser 2 is connected with a 1 x 2 optical splitter 3, one output end of the 1 x 2 optical splitter 3 enters an energy meter 4, the other output end of the 1 x 2 optical splitter 3 is reflected by a plane mirror 5 and then vertically enters a water-air interface, so that a laser pulse signal is converted into an acoustic signal to propagate underwater, an underwater hydrophone 6 receives the acoustic signal, an output end of the hydrophone 6 is connected with a signal processing circuit 7, a control end of the signal processing circuit 7 is connected with the industrial personal computer 1, in this example, the pulse laser 2 is Nd: a YAG laser;
the energy meter 4 is a laser energy monitor and is used for detecting the energy of each laser pulse; a microphone 13 for collecting sound signals and an A/D conversion circuit 14 are also arranged, and the A/D conversion circuit is used for converting voice signals received by the microphone into digital signals and sending the digital signals to the pulse laser 2; the signal processing circuit 7 comprises a first band-pass filter 8 and a second band-pass filter 9, wherein the working frequency bands of the first band-pass filter 8 and the second band-pass filter 9 are different, the output end of the first band-pass filter 8 is connected with a full-wave rectifying circuit 10, the output end of the full-wave rectifying circuit 10 is connected with a low-pass filter 11, the output end of the second band-pass filter 9 is connected with another full-wave rectifying circuit 10, the output end of the full-wave rectifying circuit 10 is connected with another low-pass filter 11, and signals output by the two low-pass filters 11 are superposed by a superposer and then sent to a sampling decision device 12 to obtain original signal information;
when the digital signal processing device works, under the control of an industrial personal computer 1, a microphone is used for collecting voice signals, the voice signals are sent to an A/D conversion circuit 14 for A/D conversion, and the converted digital signals are sent to a pulse laser 2 after being coded; selecting a transmission repetition rate range to ensure that the narrowband characteristic of a laser induced acoustic signal is best, the energy at the central frequency is strong, the higher harmonic suppression is good, and selecting 15 kHz, 18 kHz, 21 kHz and 24kHz as the central frequency; the repetition frequency of the pulse laser 2 is controlled to respectively represent information with different digital signal amplitudes according to 15 kHz, 18 kHz, 21 kHz and 24kHz, an acoustic signal generated by N laser pulses is used as a code element signal to generate a frequency domain keying (4-FSK) modulation signal to carry information, coded transmission of the laser signal is realized, a light beam output by the pulse laser 2 is divided into two beams after passing through a light splitter 3, wherein one beam enters an energy meter by 2% of energy, so that the energy of each laser pulse is detected; the other beam is reflected by the plane mirror and vertically incident to a water-air interface, laser energy is focused to generate a thermal expansion effect, and then a laser pulse signal is converted into an acoustic signal to be transmitted to each direction underwater;
the acoustic signal is transmitted through an underwater acoustic channel, received by the hydrophone 6, converted into an electric signal and transmitted to the signal processing circuit 7; demodulating a frequency shift keying (4-FSK) signal by using a non-coherent envelope detection mode to divide an electric signal into 4 paths, and then passing through a band-pass filter, wherein the central frequency bandwidth is limited within 3 kHz; and the demodulated signal is sequentially subjected to decoding and D/A conversion to obtain original signal information, and cross-medium communication from air to water is completed.
Compared with the prior art, the utility model, sea communication channel adverse conditions before can adapting to is showing the error rate that falls, and then improves communication quality.
Claims (5)
1. The utility model provides an air is to water and is crossed medium laser and send sound communication device which characterized in that is equipped with the industrial computer, the industrial computer links to each other with pulse laser, pulse laser's output links to each other with 1 x 2 beam splitter, 1 x 2 beam splitter's output gets into the energy meter all the way, another way output through the plane mirror after-reflection perpendicular incidence aqueous vapor interface, make laser pulse signal convert the acoustic signal and propagate under water, the hydrophone that is located under water receives the acoustic signal, the output of hydrophone links to each other with signal processing circuit, signal processing circuit's control end links to each other with the industrial computer.
2. An air-to-water cross-medium laser induced acoustic communication device according to claim 1, wherein the laser is Nd: YAG laser.
3. An air-to-water cross-medium laser acoustic communication device according to claim 1, wherein the energy meter is a laser energy monitor for detecting the energy of each laser pulse.
4. An air-to-water cross-medium laser induced acoustic communication device according to claim 1, wherein the signal processing circuit comprises a first band-pass filter and a second band-pass filter, wherein the first band-pass filter and the second band-pass filter have different operating frequency bands, the output end of the first band-pass filter is connected with a full-wave rectifying circuit, the output end of the full-wave rectifying circuit is connected with a low-pass filter, the output end of the second band-pass filter is connected with another full-wave rectifying circuit, the output end of the full-wave rectifying circuit is connected with another low-pass filter, and the signals output by the two low-pass filters are superposed by a superposition device and then sent to a sampling decision device to obtain original signal information.
5. An air-to-water laser induced acoustic communication device as claimed in claim 4 wherein the pulsed laser has a center frequency in the range of repetition rates of 15, 18, 21, 24kHz and the band pass filter has a bandwidth of the center frequency limited to within 3 kHz.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222203810.XU CN218041403U (en) | 2022-08-22 | 2022-08-22 | Air-to-water cross-medium laser induced acoustic communication device |
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| CN202222203810.XU CN218041403U (en) | 2022-08-22 | 2022-08-22 | Air-to-water cross-medium laser induced acoustic communication device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116318436A (en) * | 2023-03-10 | 2023-06-23 | 哈尔滨工业大学（威海） | Manchester code-based air-to-water cross-medium laser induced acoustic communication method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116318436A (en) * | 2023-03-10 | 2023-06-23 | 哈尔滨工业大学（威海） | Manchester code-based air-to-water cross-medium laser induced acoustic communication method |
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