CN115559713A - Linear frequency modulation signal processing system and method for sound wave wireless transmission - Google Patents
Linear frequency modulation signal processing system and method for sound wave wireless transmission Download PDFInfo
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- CN115559713A CN115559713A CN202211115306.2A CN202211115306A CN115559713A CN 115559713 A CN115559713 A CN 115559713A CN 202211115306 A CN202211115306 A CN 202211115306A CN 115559713 A CN115559713 A CN 115559713A
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B47/00—Survey of boreholes or wells
- E21B47/12—Means for transmitting measuring-signals or control signals from the well to the surface, or from the surface to the well, e.g. for logging while drilling
- E21B47/14—Means for transmitting measuring-signals or control signals from the well to the surface, or from the surface to the well, e.g. for logging while drilling using acoustic waves
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/69—Spread spectrum techniques
- H04B1/7163—Spread spectrum techniques using impulse radio
Abstract
The invention relates to a linear frequency modulation signal processing system and method for sound wave wireless transmission, which is characterized by comprising the following steps: the signal processing module is used for acquiring a linear frequency modulation signal of sound waves and generating a sine pulse width modulation signal; the amplifying circuit is used for amplifying the sine pulse width modulation signal; a drive circuit for driving the on state of the amplification circuit; the filter circuit is used for filtering the amplified sinusoidal pulse width modulation signal and outputting the filtered sinusoidal pulse width modulation signal to a load end for driving; the monitoring feedback module is used for monitoring the filtered frequency signal, and the signal processing module acquires and uploads the frequency signal.
Description
Technical Field
The invention relates to the technical field of wireless acoustic logging instruments, in particular to a linear frequency modulation (Chirp) signal processing system and method for acoustic wireless transmission.
Background
Along with the continuous deepening of oil and gas exploration, the well logging difficulty is higher and higher, the well depth is about 1000 to 2000 meters originally, then the well depth is 3000 meters, and the well depth is 5000 and 6000 meters, so that the problems of high risk and high danger exist in the exploitation process. Therefore, people want to know the working condition of the downhole instrument accurately in the oil exploitation process, and need to transmit the downhole real-time information in the drilling process to the surface. And the field worker can correctly evaluate the working condition of the underground instrument by analyzing the real-time data transmitted by the underground instrument. Therefore, measurement while drilling and information transmission are one of the key technologies, and data such as downhole pressure, downhole temperature and the like must be acquired in real time, so that the timely acquisition of the information has a very important meaning for accurately detecting the stratum, the geological structure and the oil reservoir reserves. Therefore, the way to transmit downhole information to the well and analyze the information is always the research focus of the petroleum industry.
The underground information transmission mode can be divided into wired transmission and wireless transmission. The main modes of wired transmission comprise cable transmission, intelligent drill rod transmission and optical fiber transmission, the wired cable transmission is to transmit a logging instrument with required parameters into the underground through a gap between an oil pipe and a sleeve by a seven-core or single-core logging cable, and to transmit the obtained underground information to a ground receiving device through a cable. However, the method has the greatest defects that the logging instrument can be lowered to the well bottom through the cable after shutdown, multiple tests are carried out within one year, the cost is huge, and the problems of high cost, complex structural connection, poor universality and the like exist because the cable and the well casing are frequently rubbed and broken during collision to cause measurement failure. The theoretical data transmission rate of intelligent drill pipe transmission and optical fiber transmission is far higher than that of sound wave transmission, but the transmission rate is limited to the experimental research stage at present due to the fact that the transmission rate is expensive and the technology is complex. The wireless transmission modes comprise mud pulse transmission, sound wave transmission and electromagnetic wave transmission. At present, the mode commonly adopted by underground data transmission is mud pulse transmission, the mode adopts drilling fluid as power, the data collected underground is converted into pressure signals through an underground pulse generator, the pressure signals are transmitted to the ground while drilling, and the underground data are analyzed through a ground system. The method has the advantages that the traditional special drill pipe and cable are abandoned, and the defects that the transmission speed is not high and the drilling fluid is restricted are overcome. The electromagnetic wave transmission mode is that the underground instrument converts collected data into signals, and then the electromagnetic waves transmit the signals to the surrounding. The surface system receives the electromagnetic wave signal, processes various signals and calculates to obtain the data collected underground. The electromagnetic wave transmission has the advantages that the transmission rate is higher than that of mud pulse transmission, any receiving object is not needed during bidirectional transmission, and the electromagnetic wave transmission can be applied to common drilling, foam drilling and underbalanced drilling. However, when electromagnetic waves are transmitted, energy attenuation is large, formation materials are carriers for the transmission of the electromagnetic waves, and the influence of formation medium conditions on signals is large. Particularly well sites, thereby increasing the difficulty of signal detection. The advent of acoustic transmission while drilling has solved some of the problems that arise in the above-described approaches. The acoustic transmission while drilling uses an acoustic signal as a transmission medium, and when the acoustic signal is transmitted in a channel of a drill pipe, the characteristic frequency band characteristic in a drill string can allow the acoustic transmission of specific frequency and the transmission rate is not low, so that the acoustic transmission while drilling is an information transmission mode with great potential. The advantage of utilizing the acoustic transmission mode to transmit data in the pit is with low costs, and the time that the data signal transmitted to the ground is shorter, is difficult for receiving the drilling fluid interference. However, the same problem is faced in either acoustic or electromagnetic transmission or other transmission methods, that is, various attenuations of signals during downhole transmission, resulting in short transmission distances. These problems have been troubling researchers, and if not solved, have caused many troubles in oil extraction.
As a core device for underground sound wave emission, a power amplifier needs to have a wide power supply voltage range and output current is large enough. Meanwhile, the temperature drift characteristic of the device is good. In the prior art, most of the preceding-stage signals are generated by a special digital frequency synthesis chip and then are generated by a signal amplification circuit, which puts very strict requirements on the signal amplification circuit: the integrated circuit chip has the advantages that the voltage resistance is high, the output current is large, the output power consumption is large, the output efficiency is high, too many circuit structures, switching tubes and the like are integrated in the integrated circuit chip, so that the output power consumption of the chip cannot be too large, the integrated circuit chip can only work in a relatively low voltage range in actual work, and the instantaneous working current is also very idle.
Disclosure of Invention
In view of the above problems, it is an object of the present invention to provide a chirp signal processing system and method for wireless transmission of sound waves, which can operate in a wide voltage range and has a large output current.
In order to achieve the purpose, the invention adopts the following technical scheme: in one aspect, a chirp signal processing system for wireless transmission of acoustic waves is provided, comprising:
the signal processing module is used for acquiring a linear frequency modulation signal of sound waves and generating a sine pulse width modulation signal;
the amplifying circuit is used for amplifying the sine pulse width modulation signal;
a drive circuit for driving the on state of the amplification circuit;
the filter circuit is used for filtering the amplified sinusoidal pulse width modulation signal and outputting the filtered sinusoidal pulse width modulation signal to a load end for driving;
and the monitoring feedback module is used for monitoring the filtered frequency signal, and the signal processing module acquires and uploads the frequency signal.
Furthermore, the linear frequency modulation signal processing system also comprises a clock module and a temperature sensor;
the clock module is used for representing the signal acquisition time;
the temperature sensor is used for acquiring the working environment temperature of the circuit.
Further, the amplifying circuit adopts an H-bridge type amplifying circuit.
Further, the H-bridge type amplifying circuit comprises a first field effect transistor, a second field effect transistor, a third field effect transistor and a fourth field effect transistor;
the grid electrodes of the first field effect transistor, the second field effect transistor, the third field effect transistor and the fourth field effect transistor are respectively connected with the output end of the driving circuit; the drain electrodes of the first field effect tube and the third field effect tube are connected in parallel with a power supply, and the source electrodes of the first field effect tube and the third field effect tube and the drain electrodes of the second field effect tube and the fourth field effect tube are connected in parallel with the filter circuit; and the source electrodes of the second field effect transistor and the fourth field effect transistor are respectively grounded.
Further, the first field effect transistor, the second field effect transistor, the third field effect transistor and the fourth field effect transistor are all N-channel enhancement type field effect transistors.
Further, the signal processing module includes:
the signal generating unit is used for acquiring a linear frequency modulation signal of sound waves and generating a separated sine pulse width modulation signal through internal PWM;
the ADC unit is used for acquiring a frequency signal of the linear frequency modulation signal;
and the signal transmission unit is used for uploading the frequency signals acquired by the ADC unit through a communication module.
Further, the monitoring feedback module comprises:
the operational amplifier is used for acquiring the frequency signal of the filtered circuit and filtering the frequency signal;
and the level comparator is used for generating a trigger pulse for enabling the ADC unit according to the signal processed by the operational amplifier.
Further, the communication module includes:
the RS485 interface is used for communicating with an external sensor and an upper computer;
the IIC module is used for communicating with the clock module through an IIC protocol;
and the SPI module is used for communicating with the temperature sensor.
In another aspect, a chirp signal processing method for wireless transmission of acoustic waves is provided, including:
the signal processing module acquires a linear frequency modulation signal of sound waves and generates a sine pulse width modulation signal;
the drive circuit drives the amplification circuit to be conducted, and the amplification circuit amplifies the sine pulse width modulation signal;
the filter circuit filters the amplified sinusoidal pulse width modulation signal and outputs the filtered sinusoidal pulse width modulation signal to a load end for driving;
the monitoring feedback module monitors the filtered frequency signal;
and the signal processing module acquires and uploads the frequency signal.
Further, the signal processing module acquires a chirp signal of a sound wave and generates a sinusoidal pulse width modulation signal, including:
the signal generating unit is interrupted by an internal timer to obtain the duty ratio parameter value of internal PWM, and the PWM works for one period;
when the previous PWM in the signal generating unit finishes working, the duty ratio parameter assignment of the next PWM is carried out to generate the next PWM waveform;
and after one sine wave period is finished, the PWM in the signal generating unit stops working to generate a separated sine pulse width modulation signal.
Further, the driving circuit drives the amplifying circuit to be conducted, and the amplifying circuit amplifies the sine pulse width modulation signal, and the driving circuit includes:
the driving circuit drives the grids of the first field effect tube, the second field effect tube, the third field effect tube and the fourth field effect tube so as to control the conduction states of the drain electrodes and the source electrodes of the first field effect tube, the second field effect tube, the third field effect tube and the fourth field effect tube;
the amplifying circuit carries out shaping processing on the separated sine pulse width modulation signal and sends the shaped signal to the filter circuit.
Due to the adoption of the technical scheme, the invention has the following advantages:
1. the invention adopts SPWM mode to realize the generation of linear frequency modulation signal, the frequency of the linear frequency modulation signal is low, the wavelength is longer, and the invention is more suitable for long-distance transmission.
2. The amplifying circuit 2 provided by the invention adopts an H-bridge type amplifying circuit to amplify the linear frequency modulation signal so as to excite larger energy.
3. The linear frequency modulation signal is a broadband frequency sweeping signal from 500Hz to 1.5KHz, and the frequency selectivity falling caused by a periodic tubular column can be well resisted.
4. The technical scheme of the invention fully considers the limitation of underground application environment, adopts SPWM to replace DA to generate linear frequency modulation signals, and has low system power consumption and high reliability.
In conclusion, the invention can be widely applied to the technical field of wireless acoustic logging instruments.
Drawings
Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Like reference numerals refer to like parts throughout the drawings. In the drawings:
fig. 1 is a schematic structural diagram of a downhole acoustic bidirectional wireless transmission relay system according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a chirp signal processing system according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a chirp driving signal waveform provided in accordance with an embodiment of the present invention;
fig. 4 is a schematic voltage-current waveform diagram of a chirp signal during a load operation according to an embodiment of the present invention.
Detailed Description
Exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the invention are shown in the drawings, it should be understood that the invention can be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.
It is to be understood that the terminology used herein is for the purpose of describing particular example embodiments only, and is not intended to be limiting. As used herein, the singular forms "a", "an" and "the" may be intended to include the plural forms as well, unless the context clearly indicates otherwise. The terms "comprises," "comprising," "including," and "having" are inclusive and therefore specify the presence of stated features, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and/or groups thereof. The method steps, processes, and operations described herein are not to be construed as necessarily requiring their performance in the particular order described or illustrated, unless specifically identified as an order of performance. It should also be understood that additional or alternative steps may be used.
Although the terms first, second, third, etc. may be used herein to describe various elements, components, regions, layers and/or sections, these elements, components, regions, layers and/or sections should not be limited by these terms. These terms may be only used to distinguish one element, component, region, layer or section from another region, layer or section. Terms such as "first," "second," and other numerical terms when used herein do not imply a sequence or order unless clearly indicated by the context. Thus, a first element, component, region, layer or section discussed below could be termed a second element, component, region, layer or section without departing from the teachings of the example embodiments.
As shown in fig. 1, an example of implementation of driving of a downhole acoustic wave bidirectional wireless transmission relay system disclosed in the prior art is shown, wherein a power amplification circuit adopts an LM1875 high-voltage high-current operational amplifier, a maximum power supply voltage of the LM1875 is 60V, a maximum output power is 30W, and a static operating current is 50mA, when an output power reaches a critical value, the LM1875 triggers an overheat protection mechanism, and the protection circuit normally operates, and the downhole acoustic wave bidirectional wireless transmission relay system in fig. 1 is prone to overheat and crash under a high power condition. The working voltage of the circuit can reach 500V at most, the continuous working current can reach 5A at most, and the instantaneous working current can reach 25A at most, compared with the traditional signal amplifying circuit, the output power consumption of the circuit can be very large, but in consideration of the actual power consumption of the transducer, the actual instantaneous power of the circuit is 500W, the continuous working power of the circuit is 270W, the stable amplification of the linear frequency modulation signal can be realized, the circuit has high power density and good high-temperature characteristic, and the problem of heat generation of the integrated operational amplifier in the prior art is solved.
Example 1
As shown in fig. 2, the present embodiment provides a chirp signal processing system for wireless transmission of sound waves, which includes a signal processing module 1, an amplifying circuit 2, a driving circuit 3, a filtering circuit 4, a monitoring feedback module 5, and a communication module 6.
The signal processing module 1 is configured to obtain a chirp signal of a sound wave, and generate a separated Sinusoidal Pulse Width Modulation (SPWM) signal.
The amplifying circuit 2 is used for amplifying the sinusoidal pulse width modulation signal.
The drive circuit 3 is used to drive the on state of the amplification circuit 2.
The filter circuit 4 is configured to filter the amplified sinusoidal pulse width modulation signal and output the filtered sinusoidal pulse width modulation signal to the load terminal 7 for driving.
The monitoring feedback module 5 is used for monitoring a frequency signal of the filtered circuit, the frequency signal is used for evaluating whether the frequency of a linear frequency modulation signal generated by the sine pulse width modulation signal meets the requirement, and the signal processing module 1 acquires the frequency signal and uploads the frequency signal through the communication module 6.
In a preferred embodiment, the chirp signal processing system further includes a clock module for characterizing the time of signal acquisition.
In a preferred embodiment, the chirp signal processing system further includes a temperature sensor for acquiring a working environment temperature of the circuit, and when the working environment temperature exceeds a limit, the circuit is protected.
In a preferred embodiment, the amplifying circuit 2 is an H-bridge amplifying circuit composed of a first fet a, a second fet b, a third fet c and a fourth fet d.
The grid electrodes G of the first field effect tube a, the second field effect tube b, the third field effect tube c and the fourth field effect tube d are respectively connected with the output end of the driving circuit 3. The drain electrodes D of the first field effect tube a and the third field effect tube c are connected in parallel with a power supply VCC, and the source electrodes S of the first field effect tube a and the third field effect tube c and the drain electrodes D of the second field effect tube b and the fourth field effect tube D are connected in parallel with a filter circuit 4. The source electrodes S of the second field effect tube b and the fourth field effect tube d are respectively grounded.
Specifically, the first field-effect tube a, the second field-effect tube b, the third field-effect tube c and the fourth field-effect tube d are all N-channel enhancement type field-effect tubes, and the conduction internal resistances of the N-channel enhancement type field-effect tubes are in a milliohm level with two digits, so that the energy loss on the field-effect tubes is very small when a circuit is conducted, the field-effect tubes are selected TO be packaged by TO-252 patches, and the width of the two field-effect tubes is smaller than 20mm when the two field-effect tubes are placed simultaneously, so that the prerequisite condition of instrument miniaturization is achieved.
Specifically, the peak voltage of the amplifying circuit 2 is determined by the voltage of the power supply VCC of the H-bridge, and at the same time, the drain-source voltage of the first fet a, the second fet b, the third fet c, and the fourth fet d is also determined to be greater than or equal to 1.5 times the VCC value, so as to ensure the stability and reliability of the circuit and save the cost.
In a preferred embodiment, the signal processing module 1 comprises a signal generating unit, a PWM (pulse width modulation) port, an ADC unit and a signal transmitting unit.
The signal generating unit is used for acquiring a linear frequency modulation signal of sound waves, performing data acquisition in real time by interrupting through an internal timer, and generating a separated sine pulse width modulation signal through internal PWM.
The PWM port is used to send a separate sinusoidal pulse width modulated signal to the drive circuit 3.
The ADC unit is used for acquiring a frequency signal of the linear frequency modulation signal.
The signal transmission unit is used for uploading the frequency signals acquired by the ADC unit through the communication module 6.
In a preferred embodiment, drive circuit 3 can adopt the drive chip of the special drive chip of H bridge that two IR companies produced, this drive chip has optical coupling isolation and electromagnetic isolation's advantage, withstand voltage height is difficult to the characteristic of being punctured, the chip is inside to adopt the structural style of bootstrap voltage, its peripheral circuit simple structure, the high-voltage end adopts electric capacity to carry out the energy storage, can drive two N type field effect tubes, the PCB overall arrangement space has been practiced thrift greatly, for the miniaturization of instrument and local scattered thermal treatment provide convenient condition.
In a preferred embodiment, the filter circuit 4 may employ an LC filter circuit 4.
In a preferred embodiment, the monitoring feedback module 5 comprises an operational amplifier and a level comparator. The operational amplifier is used for collecting and filtering the frequency signal of the filtered circuit. The level comparator is used for generating a trigger pulse according to the signal processed by the operational amplifier, and the trigger pulse enables the ADC unit of the signal processing module 1 to complete the acquisition of a single chirp signal.
Specifically, the operational amplifier may adopt an AD8479 type operational amplifier for signal monitoring and feedback, and the common mode voltage of the operational amplifier is 600V, which may satisfy the voltage withstand requirement of the peak voltage after the voltage amplification of the H-bridge type amplification circuit 2.
In a preferred embodiment, the communication module 6 includes an RS485 interface 61, an IIC (integrated circuit bus) module 62, and an SPI (serial peripheral interface) module 63. The RS485 interface 61 is used for communicating with an external sensor, an upper computer and the like, and data interaction, data calibration and the like are achieved. The IIC module 62 is used for communicating with the clock module through an IIC protocol, so as to ensure timeliness of data storage. The SPI module 63 is used to communicate with the temperature sensor.
In a preferred embodiment, the fundamental frequency used by the amplifying circuit 2 is 20KHZ, the carrier frequency is 1KHZ, and the cut-off frequency of the filter circuit 4 is 2KHZ.
As shown in fig. 3, a waveform diagram of a chirp driving signal, which can be used to drive an H-bridge circuit to generate a chirp signal; fig. 4 is a schematic diagram of voltage and current waveforms when the chirp signal is in an on-load operation, in which a peak-to-peak voltage is 200V, a peak-to-peak current is 20A (100 mV/a gear), and an instantaneous power thereof can reach 1000W.
Example 2
The embodiment provides a chirp signal processing method for sound wave wireless transmission, which comprises the following steps:
1) The signal processing module 1 acquires a chirp signal of a sound wave and generates a separated sine pulse width modulation signal, which specifically comprises:
1.1 The signal generating unit obtains the duty ratio parameter value of the internal PWM through the interruption of the internal timer, and the PWM works for one period.
1.2 When the previous PWM in the signal generating unit finishes working, the duty ratio parameter assignment of the next PWM is carried out to generate the next PWM waveform.
1.3 When a sine wave period ends, the PWM in the signal generating unit stops working, and this process generates a separated sine pulse width modulation signal.
1.4 ) sends a separate sinusoidal pulse width modulated signal to the drive circuit 3 via the PWM port.
2) Drive circuit 3 drives amplifier circuit 2 and switches on, and amplifier circuit 2 amplifies the sinusoidal pulse width modulation signal of disconnect-type, specifically is:
2.1 The drive circuit 3 drives the amplification circuit 2 on.
Specifically, the driving circuit 3 drives the gates G of the first field effect transistor a, the second field effect transistor b, the third field effect transistor c and the fourth field effect transistor D to control the conduction states of the drains D and the sources S of the first field effect transistor a, the second field effect transistor b, the third field effect transistor c and the fourth field effect transistor D.
2.2 The amplification circuit 2 amplifies the split sinusoidal pulse width modulated signal.
Specifically, the amplifying circuit 2 shapes the split sinusoidal pulse width modulation signal, increases the driving capability of the split sinusoidal pulse width modulation signal, and then sends the shaped signal to the filter circuit 4, thereby completing the amplification of the split sinusoidal pulse width modulation signal.
3) The filter circuit 4 filters the amplified SPWM signal and outputs the filtered SPWM signal to the load terminal 7 for driving.
4) The monitoring feedback module 5 monitors the frequency signal of the filtered circuit, and specifically comprises:
4.1 The operational amplifier collects and filters the frequency signal of the filtered circuit, and the accuracy of sampling the feedback signal is ensured.
4.2 Level comparator generates trigger pulse according to the signal processed by the operational amplifier, so that the ADC unit can complete the acquisition of a single linear frequency modulation signal.
5) The signal processing module 1 acquires the frequency signal and uploads the frequency signal through the communication module 6, and specifically includes:
5.1 ) the ADC unit obtains a chirp frequency signal.
5.2 The signal transmission unit uploads the frequency signal acquired by the ADC unit through the communication module 6.
The above embodiments are only used for illustrating the present invention, and the structure, connection manner, manufacturing process and the like of each component can be changed, and equivalent changes and improvements made on the basis of the technical scheme of the present invention should not be excluded from the protection scope of the present invention.
Claims (10)
1. A chirp signal processing system for wireless transmission of sound waves, comprising:
the signal processing module is used for acquiring a linear frequency modulation signal of sound waves and generating a sine pulse width modulation signal;
the amplifying circuit is used for amplifying the sine pulse width modulation signal;
a drive circuit for driving the on state of the amplification circuit;
the filter circuit is used for filtering the amplified sinusoidal pulse width modulation signal and outputting the filtered sinusoidal pulse width modulation signal to a load end for driving;
and the monitoring feedback module is used for monitoring the filtered frequency signal, and the signal processing module acquires and uploads the frequency signal.
2. A chirp processing system for wireless transmission of acoustic waves as claimed in claim 1, further comprising a clock module and a temperature sensor;
the clock module is used for representing the signal acquisition time;
the temperature sensor is used for acquiring the working environment temperature of the circuit.
3. A chirp signal processing system for wireless transmission of acoustic waves as claimed in claim 1 in which the amplification circuit is an H-bridge amplification circuit.
4. A system as claimed in claim 3, wherein said H-bridge amplifier circuit comprises a first fet, a second fet, a third fet and a fourth fet;
the grid electrodes of the first field effect transistor, the second field effect transistor, the third field effect transistor and the fourth field effect transistor are respectively connected with the output end of the driving circuit; the drain electrodes of the first field effect tube and the third field effect tube are connected in parallel with a power supply, and the source electrodes of the first field effect tube and the third field effect tube and the drain electrodes of the second field effect tube and the fourth field effect tube are connected in parallel with the filter circuit; and the source electrodes of the second field effect transistor and the fourth field effect transistor are respectively grounded.
5. A system as claimed in claim 4, wherein the first FET, the second FET, the third FET and the fourth FET are N-channel enhancement FETs.
6. A chirp signal processing system for wireless transmission of acoustic waves according to claim 1, wherein the signal processing module includes:
the signal generating unit is used for acquiring a linear frequency modulation signal of sound waves and generating a separated sine pulse width modulation signal through internal PWM;
the ADC unit is used for acquiring a frequency signal of the linear frequency modulation signal;
and the signal transmission unit is used for uploading the frequency signals acquired by the ADC unit through a communication module.
7. A chirp processing system for wireless transmission of acoustic waves according to claim 6, wherein the monitoring feedback module includes:
the operational amplifier is used for acquiring the frequency signal of the filtered circuit and filtering the frequency signal;
and the level comparator is used for generating a trigger pulse for enabling the ADC unit according to the signal processed by the operational amplifier.
8. A chirp signal processing method for wireless transmission of acoustic waves, comprising:
the signal processing module acquires a linear frequency modulation signal of sound waves and generates a sine pulse width modulation signal;
the drive circuit drives the amplifying circuit to be conducted, and the amplifying circuit amplifies the sine pulse width modulation signal;
the filter circuit filters the amplified sinusoidal pulse width modulation signal and outputs the filtered sinusoidal pulse width modulation signal to a load end for driving;
the monitoring feedback module monitors the filtered frequency signal;
and the signal processing module acquires and uploads the frequency signal.
9. A method of processing chirp signals for wireless transmission of acoustic waves as claimed in claim 8, wherein the signal processing module acquires a chirp signal of an acoustic wave and generates a sinusoidal pulse width modulated signal, comprising:
the signal generating unit is interrupted by an internal timer to obtain a duty ratio parameter value of internal PWM, and the PWM works for one period;
when the previous PWM in the signal generating unit finishes working, the duty ratio parameter assignment of the next PWM is carried out to generate the next PWM waveform;
and after one sine wave period is finished, the PWM in the signal generating unit stops working to generate a separated sine pulse width modulation signal.
10. A method of processing chirp signals for wireless transmission of acoustic waves as claimed in claim 8, wherein the drive circuit drives the amplification circuit on, the amplification circuit amplifying the sinusoidal pulse width modulated signal, comprising:
the driving circuit drives the grids of the first field effect tube, the second field effect tube, the third field effect tube and the fourth field effect tube so as to control the conduction states of the drain electrodes and the source electrodes of the first field effect tube, the second field effect tube, the third field effect tube and the fourth field effect tube;
the amplifying circuit carries out shaping processing on the separated sine pulse width modulation signal and sends the shaped signal to the filter circuit.
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