Underwater sensing and transmitting integrated backscatter communication system and method

Abstract

The invention provides an underwater sensing and transmitting integrated backscatter communication system and method, and the system comprises an underwater passive backscatter node which is composed of a signal conversion module, an energy storage module, and a load module. The energy storage module is used for converting a first signal output by the signal conversion module in a first state into a stable electric signal for storage, so that the load module is driven to acquire sensing detection data and map the sensing detection data into an output control signal; and the control module is used for controlling the signal conversion module to switch between the first state and the second state and modulating the sensing detection data into a second signal output by the control signal conversion module in the second state. According to the underwater sensing and transmitting integrated backscatter communication system provided by the invention, the power consumption of the underwater passive backscatter node is reduced, and the accuracy and timeliness of the underwater sensing and transmitting integrated backscatter communication system are improved.

Description

Technical Field

[0001] The present application relates to the field of underwater sensor communication technology, and in particular to an underwater sensor-integrated backscatter communication system and method. Background Art

[0002] Underwater acoustic backscatter communication is an emerging underwater communication technology. It backscatters existing acoustic signals instead of actively generating acoustic signals, so it can enjoy the benefits of low power consumption and long operation brought by the Internet of Things. Because of its green and pollution-free characteristics, it can be widely used in marine resource exploration, climate monitoring, species tracking and other fields.

[0003] The underwater acoustic backscatter system usually consists of three parts. The first part is the sound source as the acoustic signal sending device, the second part is the receiving end using a hydrophone as a signal receiving device, and the third part is a passive backscatter node. The passive reflection scattering node is used to modulate the acoustic signal sent by the acoustic signal sending device, so as to load the detection data obtained by the sensor into the acoustic signal and reflect it to the receiving end, and obtain the detection data through the receiving end receiving decoding. However, the operation of existing underwater passive backscatter nodes is usually controlled by an embedded controller, which has the problems of high hardware cost, complex circuit design, high working power consumption, etc., and underwater passive backscatter nodes are usually unable to achieve zero power standby. If it is necessary to remain able to respond to external information, active monitoring is required, which will lead to more serious standby power consumption.

[0004] Therefore, how to provide an underwater integrated sensing and backscattering communication system and method that can reduce communication energy consumption during operation and improve the accuracy and timeliness of the communication system has become one of the technical problems that people in this field urgently need to solve. Summary of the invention

[0005] The present application aims to solve one of the technical problems in the related art at least to some extent.

[0006] To this end, the first purpose of the present application is to propose an underwater sensing and transmitting integrated backscatter communication system, which can improve the accuracy and timeliness of the underwater communication system and reduce communication power consumption.

[0007] To achieve the above-mentioned purpose, the first embodiment of the present application proposes an underwater sensing and transmitting integrated backscatter communication system, wherein the communication system comprises an underwater passive backscatter node, and the underwater passive backscatter node comprises a signal conversion module, an energy storage module and a load module; wherein,

[0008] The signal conversion module includes a first state and a second state, the signal conversion module outputs a first signal in the first state, and outputs a second signal in the second state;

[0009] The energy storage module is used to receive the first signal and convert the first signal into a stably stored electrical signal to provide power for the operation of the load module;

[0010] The load module is driven by the energy storage module to obtain sensor detection data and convert the sensor detection data into a control signal for the signal conversion module to control the signal conversion module to switch between the first state and the second state.

[0011] Optionally, the communication system also includes a transmitter module and a receiver module; the transmitter module is used to transmit an excitation signal to the signal conversion module to excite the signal conversion module to a first state; the receiver module is used to receive the second signal to parse the sensor detection data acquired by the load module according to the second signal.

[0012] Optionally, the load module includes a sensing unit and an analog oscillation unit; the sensing unit, under the power supply and drive of the energy storage module, outputs the acquired sensing detection data to the analog oscillation unit, and the analog oscillation unit converts the sensing detection data into frequency parameters of the control signal based on the mapping relationship between the sensing detection data, characteristic parameters of the sensing unit, and setting parameters of the analog oscillation unit.

[0013] Optionally, the sensing unit includes at least any one of a resistive sensor and a capacitive sensor, and the physical characteristic parameter of the sensing unit includes a change parameter of a resistance value or a capacitance value.

[0014] Optionally, the signal conversion module includes an underwater acoustic signal transducer and a switch component, wherein the switch component is used to receive the control signal and can switch between an on state and an off state based on the control signal; wherein,

[0015] When the switch assembly is in the on state, the signal conversion module is in the first state, and the hydroacoustic signal transducer outputs the first signal to the energy storage module;

[0016] When the switch assembly is in the off state, the signal conversion module is in the second state, and the hydroacoustic signal transducer outputs the second signal to the receiver module.

[0017] Optionally, the control signal is a periodic square wave signal, and the square wave signal drives the switch component to switch between an on state and an off state to modulate the excitation signal received by the signal conversion module and reflect and output the second signal to the receiver module.

[0018] Optionally, the energy storage module includes a rectifier unit, a voltage stabilizing unit and an energy storage unit connected in sequence; wherein,

[0019] The rectifying unit is used to receive the first signal and convert the first signal into a direct current signal;

[0020] The voltage stabilizing unit is used to receive the DC signal at the input end of the rectifying unit and convert the DC signal into a DC signal of a specific stable voltage;

[0021] The energy storage unit is used to receive and store the direct current signal with a stable voltage output by the voltage stabilizing unit.

[0022] The second aspect of the present application provides an underwater sensing and transmitting integrated backscatter communication method, the communication method comprising:

[0023] Providing an underwater passive backscatter node, the underwater passive backscatter node comprising a signal conversion module, an energy storage module and a load module;

[0024] Using a transmitter module to transmit an excitation signal to the underwater passive backscatter node, so that the signal conversion module responds to the excitation signal and outputs a first signal to the energy storage module to charge the energy storage module;

[0025] The load module, under the power supply and drive of the energy storage module, collects and acquires the sensor detection data of the underwater environment, and converts the sensor detection data into the frequency parameters of the control signal for the signal conversion module;

[0026] The signal conversion module shifts and modulates the excitation signal based on the control signal, and reflects and outputs a second signal to the receiver module;

[0027] The receiver module receives the second signal and demodulates the second signal to obtain the sensing detection data.

[0028] Optionally, the signal conversion module shifts and modulates the excitation signal based on the control signal, and forms the second signal by using a continuous frequency shift keying modulation method.

[0029] Optionally, the excitation signal comprises a single-frequency sinusoidal wave hydroacoustic signal, and the first signal comprises a single-frequency sinusoidal wave electrical signal.

[0030] The underwater sensing and transmitting integrated backscatter communication system and method provided by the present application have at least the following beneficial effects:

[0031] The present application provides an underwater sensing-integrated backscatter communication system and method, the communication system includes an underwater passive backscatter node 100 composed of a signal conversion module 110, an energy storage module 120 and a load module 130, and uses the energy storage module 120 to convert the first signal output by the signal conversion module 110 in the first state into a stable electrical signal for storage, thereby driving the load module 130 to collect and obtain sensor detection data, and map the sensor detection data to the output control signal to control the signal conversion module 110 to switch between the first state and the second state, and modulate the sensor detection data to the second signal output by the control signal conversion module 110 in the second state. The underwater sensing-integrated backscatter communication system provided by the present application reduces the power consumption of the underwater passive backscatter node 100, and improves the accuracy and timeliness of the underwater sensing-integrated backscatter communication system.

[0032] Furthermore, the second signal in the present application is a control signal formed by modulating the excitation signal using a continuous frequency shift keying modulation method, thereby modulating the sensor detection data mapped in the control signal into the frequency difference between the excitation signal and the second signal, so that the second signal has the advantages of strong anti-interference ability, insensitivity to long-distance signal strength attenuation, concentrated energy distribution, and tolerance to multipath propagation.

[0033] Furthermore, the sensor detection data collected by the sensor unit in the present application is based on the sensor-sensor integrated mapping method of the full analog circuit, and is directly mapped to the control signal output by the analog oscillation unit, so there is no quantization error, ADC error data clipping and other processes, thereby ensuring that the sensor data is losslessly and continuously mapped to the subcarrier shift frequency, and the mapping process is a continuous process. The sensor detection data collected by the sensor is transmitted back and updated at an infinitely high frequency, thereby greatly improving the real-time performance of the sensor data update.

[0034] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the following description of the embodiments in conjunction with the accompanying drawings, in which:

[0036] Figure 1 It is a schematic diagram of the structure of a sensing-sensing integrated backscatter communication system according to an embodiment of the present application.

[0037] Figure 2 The figure is a schematic diagram of the structure of an underwater passive backscatter node according to an embodiment of the present application.

[0038] Figure 3It is a structural schematic diagram of a signal conversion module according to an embodiment of the present application.

[0039] Figure 4 Schematic diagram of a waveform of a second reflected signal modulation process according to an embodiment of the present application.

[0040] Figure 5 Schematic diagram of spectrum simulation of function |X(f)| according to an embodiment of the present application.

[0041] Figure 6 It is a flow chart of a sensing-sensing integrated backscatter communication method according to an embodiment of the present application.

[0042] 100 underwater passive backscatter node; 110 signal conversion module; 111 underwater acoustic signal transducer; 112 switch assembly; 120 energy storage module; 121 rectifier unit; 122 voltage stabilizing unit; 123 energy storage unit; 130 load module; 131 sensor unit; 132 analog oscillation unit; 200 transmitter module; 300 receiver module. DETAILED DESCRIPTION

[0043] Embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present application, and should not be construed as limiting the present application.

[0044] In practical applications, the energy consumption of sending and receiving underwater acoustic signals often accounts for a large part of the overall energy consumption of underwater facilities. For example, the monitoring power consumption of commonly used underwater acoustic communication systems is about 100 milliwatts, the power consumption for information demodulation is about watts (depending on the working rate), and the transmission power consumption is usually a few watts to tens of watts (for common working distances of 100 meters to several kilometers). Such significant power consumption of underwater acoustic communication modules restricts the working cycle of applications such as underwater equipment remote control, underwater positioning and navigation, and underwater information transmission.

[0045] Research has found that underwater acoustic signals can not only be used to transmit information, but also energy. By using the piezoelectric conversion effect of the sensor at the receiving end, underwater facilities can collect and store underwater acoustic energy, which is expected to subversively eliminate the dependence of underwater facilities on battery power, significantly extend the operation cycle of underwater facilities, and reduce operating and maintenance costs.

[0046] Therefore, the present application provides an underwater integrated sensing and backscattering communication system and method, which is similar to the increasingly mature reflective communication tag technology in wireless communications. In the underwater acoustic communication system, the reflection and absorption states of the piezoelectric transducer are utilized. In the absorption state, the underwater acoustic signal is converted into a stable electrical signal to achieve self-charging, and in the transmission state, information is sent by reflecting the received underwater acoustic signal.

[0047] The first aspect of the present application provides an underwater sensing and transmitting integrated backscatter communication system, such as Figure 1 As shown, the communication system includes an underwater passive backscatter node 100 , and the underwater passive backscatter node 100 includes a signal conversion module 110 , an energy storage module 120 and a load module 130 .

[0048] The signal conversion module 110 includes a first state and a second state, that is, two working states corresponding to the absorption state and the reflection state of the signal conversion module 110. In the first state, the signal conversion module 110 outputs a first signal; in the second state, the signal conversion module 110 outputs a second signal.

[0049] The energy storage module 120 is configured to receive the first signal output by the signal conversion module 110 in the first state, and convert the first signal into a stable electrical signal for storage, thereby providing stable electrical energy for subsequent operation of the load module 130 .

[0050] The load module 130 is configured to operate under the power supply of the energy storage module 120, including collecting and acquiring sensor detection data of the underwater environment, outputting a control signal to the signal conversion module 110, and converting the collected sensor detection data parameters into digital signals and mapping them into frequency parameters of the control signal.

[0051] The signal conversion module 110 is further configured to receive a control signal output by the load module 130 , and to switch the signal conversion module 110 between the first state and the second state under the drive of the control signal.

[0052] The working principle of the present application is to use the load module 130 to map the collected sensor detection data to the frequency parameters of the control signal, and use the control signal to realize that the signal conversion module 110 switches between the first state and the second state, and further modulates the sensor detection data into the second signal, so that after the second signal is received, the spectrum of the second signal is demodulated, that is, the sensor detection data mapped in the frequency parameters of the control signal can be obtained, thereby realizing the integrated sensing and sensing collection and communication transmission of underwater information, and improving the accuracy and timeliness of the underwater integrated sensing and sensing backscatter communication system.

[0053] Since the first signal output by the signal conversion module 110 in the first state will be directly received by the energy storage module 120 and converted into stable electric energy for storage in the energy storage module 120 to meet the working requirements of the load module 130, the load module 130 can rely on the charging of the energy storage module 120 to operate normally when an additional power supply is set, thereby reducing the power consumption of the backscatter communication system.

[0054] In some embodiments, the underwater sensing and sensing integrated backscatter communication system further includes a transmitter module 200 and a receiver module 300. The transmitter module 200 is used to transmit an excitation signal to the signal conversion module 110 to excite the signal conversion module 110 to a first state; the receiver module 300 is used to receive a second signal to parse the sensing detection data acquired by the load module 130 according to the second signal.

[0055] The excitation signal may be an amplified single-frequency sinusoidal hydroacoustic signal. The transmitter module 200 may use a signal generator or a computer to generate a single-frequency sinusoidal hydroacoustic signal, and send the single-frequency sinusoidal hydroacoustic signal to the input end of the power amplifier. After the power amplifier performs power amplification, the amplified single-frequency sinusoidal hydroacoustic signal is connected to the signal conversion module 110 that has been impedance matched, and the signal conversion module 110 is excited and enters the first state. Thus, the amplified single-frequency sinusoidal hydroacoustic signal can be converted into a single-frequency sinusoidal electrical signal, i.e., the first signal, by using the signal conversion module 110 in the first state.

[0056] The receiver module 300 may include a hydrophone for accurately receiving the second signal output by the signal conversion module 110. When the signal conversion module 110 receives the control signal and switches from the first state to the second state, the signal conversion module 110 will no longer absorb the excitation signal and convert it into the first signal, but will reflect the received excitation signal, that is, the second signal.

[0057] The control signal can not only control the signal conversion module 110 to switch between the first state and the second state, but also modulate the excitation signal reflected by the signal conversion module 110 in the second state. In other words, the second signal is equivalent to the movement of the excitation signal by the signal conversion module 110. The control signal modulates the excitation signal reflected by the signal conversion module 110, thereby modulating the sensing detection data mapped in the control signal into the frequency difference between the excitation signal and the second signal, so that after receiving the second signal, the receiver module 300 can parse and obtain the sensing detection data according to the second signal and the excitation signal.

[0058] Furthermore, the second signal is a control signal formed by performing continuous frequency shift keying (CFSK) modulation on the excitation signal, thereby modulating the sensor detection data mapped in the control signal into the frequency difference between the excitation signal and the second signal, so that the second signal has the advantages of strong anti-interference ability, insensitivity to long-distance signal strength attenuation, concentrated energy distribution, and tolerance to multipath propagation.

[0059] like Figure 2-3 As shown, in some embodiments, the signal conversion module 110 may include an underwater acoustic signal transducer 111 and a switch component 112 , and the switch component 112 is connected in parallel at both ends of the underwater acoustic signal transducer 111 .

[0060] The switch component 112 can be a group of switch devices connected in series and arranged in parallel at both ends of the underwater acoustic signal transducer 111, and the control end of the switch device is connected to the output end of the load module 130. Therefore, the switch component 112 can switch between the on state and the off state based on the control signal output by the load module 130, thereby enabling the underwater acoustic signal transducer 111 to switch between the first state and the second state. The first state of the underwater acoustic signal transducer 111 corresponds to the first state of the signal conversion module 110, and the second state of the underwater acoustic signal transducer 111 corresponds to the second state of the signal conversion module 110. Among them, the switch device includes but is not limited to MOS tubes, triodes and other control-type switch devices.

[0061] By setting the switch component 112 in parallel at both ends of the underwater acoustic signal transducer 111, the switch component 112 can match the input impedance of the underwater acoustic signal transducer 111 with the underwater acoustic impedance when in the off state, so that the underwater acoustic signal transducer 111 is switched to the first state and outputs the first signal to the energy storage module 120.

[0062] When the switch component 112 is in the on state, the switch component 112 can short-circuit the two ends of the hydroacoustic signal transducer 111 to make the input impedance of the hydroacoustic signal transducer 111 0, thereby switching the hydroacoustic signal transducer 111 to the second state and outputting a second signal to the receiver module 300 .

[0063] Furthermore, the control signal output by the load module 130 can be a periodic square wave signal, which switches between the on state and the off state by driving the switch component 112 to modulate the excitation signal received by the signal conversion module 110 and reflect and output a second signal to the receiver module 300.

[0064] like Figure 2-3As shown, in some embodiments, the energy storage module 120 includes a rectifier unit 121, a voltage stabilizing unit 122, and an energy storage unit 123 connected in sequence. The rectifier unit 121 is connected to the signal output end of the underwater acoustic signal transducer 111, the voltage stabilizing unit 122 is connected to the output end of the rectifier unit 121, and the energy storage unit 123 is connected to the output end of the voltage stabilizing unit 122.

[0065] It can be known from the above content that the underwater acoustic signal transducer 111 will convert the excitation signal into a first signal and output it to the energy storage module 120 in the first state, and the first signal is an AC signal with unstable voltage. By setting a rectifier unit 121 at the output end of the underwater acoustic signal transducer 111, the unstable AC signal can be converted into a DC signal with unstable voltage.

[0066] Therefore, by providing the voltage stabilizing unit 122 at the output end of the rectifying unit 121 , the unstable direct current signal output by the rectifying unit 121 can be converted into a direct current signal with a stable voltage.

[0067] Therefore, an energy storage unit 123 is further set at the output end of the voltage stabilizing unit 122, that is, the stable DC signal output by the voltage stabilizing unit 122 can be input into the energy storage unit 123, and charged and stored in the energy storage unit 123, thereby providing the working function of the subsequent load module 130.

[0068] It should be noted that the rectifying unit 121 includes but is not limited to an AC / DC rectifier, the voltage stabilizing unit 122 includes but is not limited to a DC-DC voltage converter or an LDO voltage converter, and the energy storage unit 123 includes but is not limited to a battery pack or a capacitor.

[0069] like Figure 2-3 As shown, in some embodiments, the load module 130 includes a sensing unit 131 and an analog oscillation unit 132. The sensing unit 131 is connected to the electrical output end of the energy storage unit 123, and the analog oscillation unit 132 is connected to the signal output end of the sensing unit 131.

[0070] The sensing unit 131 is connected to the energy storage unit 123 to collect environmental data around the sensing unit 131, such as underwater environmental temperature, pH, pressure, light intensity and other data, under the power supply of the energy storage unit 123, so as to obtain underwater related sensing detection data.

[0071] The analog oscillation unit is connected to the signal output end of the sensor unit 131. The analog oscillation unit can convert the sensor detection data into the frequency parameters of the control signal through a mapping conversion circuit based on the sensor detection data output by the sensor unit 131, the characteristic parameters of the sensor unit 131, and the mapping relationship between the parameters set by the analog oscillation unit 132, and output it to the signal transmitting unit to control the state of the signal transmitting unit and the spectrum of the second signal.

[0072] The sensing unit 131 may be a resistive sensor or a capacitive sensor. The working principle of the resistive sensor is mainly based on the property that the resistance of some materials changes with the change of the physical conditions of the environment. The working principle of the capacitive sensor is mainly based on sensing the change of physical or chemical conditions by detecting the change of capacitance. Therefore, the sensing unit 131 may be a characteristic parameter of the sensing unit 131 formed by the change of the resistance value or capacitance value of its internal resistance or capacitance in the measurement environment.

[0073] That is to say, the sensing detection data collected and acquired by the sensing unit 131 and the characteristic parameters should satisfy the following mapping relationship, namely:

[0074] P sensor =y(x data )

[0075] Among them, P sensor is the physical characteristic parameter of the sensing unit 131, including but not limited to the real-time resistance R of the sensing unit 131 sensor , or the real capacitance C sensor , x data The sensor unit 131 senses and collects sensor measurement data.

[0076] The analog oscillator unit may include a precision programmable analog oscillator (MPPO), such as an LTC6906 chip. The signal output terminal of the sensing unit 131 is connected to the setting terminal (SET terminal) of the precision programmable analog oscillator, and the precision programmable analog oscillator can output an oscillation signal (control signal) with a variable frequency based on the physical characteristic parameters (changes in resistance value / capacitance value) output by the sensing unit 131.

[0077] Therefore, through the sensing unit 131 and the analog oscillation unit, sensor data acquisition and modulation transmission without an embedded controller can be realized, which greatly simplifies the circuit design and greatly reduces the hardware cost and working loss of the communication system.

[0078] The sensing detection data output by the sensing unit 131, the characteristic parameters of the sensing unit 131, and the setting parameters of the analog oscillation unit 132 should satisfy the following mapping relationship, namely:

[0079]

[0080] Among them, P set The setting parameters of the analog oscillator unit, including but not limited to setting the resistor R set , or set the capacitor C set .

[0081] The frequency of the control signal and the setting parameters of the analog oscillator unit satisfy the following relationship, that is,

[0082]

[0083] Among them, F out is the output frequency of the control signal, F base is the set frequency of the precision programmable analog oscillator, P base is the characteristic parameter of the precision programmable analog oscillator, and N is the frequency division ratio N.

[0084] Therefore, by optimizing the mapping relationship between the sensor detection data output by the sensor unit 131, the characteristic parameters of the sensor unit 131, and the setting parameters of the analog oscillation unit 132, the mapping accuracy of the sensor unit 131 is improved, that is, the sensor detection data can be more accurately converted into the frequency parameters of the control signal, so that the control signal can be switched between the first state and the second state when the control signal transmitting unit is switched, thereby realizing the charging of the energy storage module 120, improving the energy utilization rate of the communication system, and reducing the power consumption of the communication system, and realizing the spectrum modulation process of the second signal, so that the receiver module 300 can parse and obtain the sensor detection data collected by the sensor unit 131 based on the spectrum of the second signal and the spectrum of the excitation signal, thereby realizing the sensing integration of the communication system.

[0085] The existing underwater sensor perception transmission method usually needs to convert the sensor detection data collected by the sensor into a voltage value, quantize and sample the voltage value through an embedded controller, and then cut and encode the read value, and finally modulate it into the reflected signal. The existing method has a variety of problems such as quantization error, ADC error, data cutting error, etc. that lead to inaccurate sensor data, and the entire process is executed step by step, resulting in the limited update frequency of the sensor detection data feedback. The sensor detection data in this application is based on a sensing and sensing integrated mapping method of a full analog circuit. There is no quantization error, ADC error data cutting and other processes, which ensures that the sensor data is losslessly and continuously mapped to the subcarrier shift frequency, and the mapping process is a continuous process. The sensor detection data collected by the sensor is infinitely high. The update frequency of the feedback is infinite, which greatly improves the real-time performance of the sensor data update.

[0086] Furthermore, if Figure 4As shown, the excitation signal c(t) is an amplified single-frequency sinusoidal underwater acoustic signal, and its expression should satisfy the following relationship, namely:

[0087] c(t)=cos 2πf c t

[0088] Among them, d c The frequency of the excitation signal.

[0089] The control signal s(t) is a periodic square wave signal, which should satisfy the following relationship within a single period T:

[0090]

[0091] Therefore, the control signal s(t) should satisfy the following relationship within N cycles T, namely:

[0092]

[0093] Since the second signal x(t) is formed by the control signal s(t) based on the continuous frequency shift keying modulation of the excitation signal c(t), the second signal x(t) is actually the product of the excitation signal c(t) and the control signal s(t), and should satisfy the following relationship, namely:

[0094] x(t)=s(t)·c(t)

[0095] Since the Fourier transform function X(f) of the second signal x(t) is equivalent to the frequency shift of the Fourier transform S(f) of the control signal s(t), the Fourier transform function S(f) of the control signal and the Fourier transform function X(f) of the second signal satisfy the following relationship, namely:

[0096]

[0097] Therefore, for the frequency spectrum of the function |X(f)|, Figure 5 As shown, the frequency difference Δf corresponding to the maximum values ​​(f1 and f2) of the two side lobes is obtained, that is, the frequency shift of the second signal can be obtained.

[0098] The frequency shift of the second signal and the output frequency F of the control signal out The following relationship is satisfied, namely

[0099]

[0100] Thus, the output frequency F of the control signal can be obtained according to the frequency shift Δf of the second signal. out, and further based on the mapping relationship between the sensing detection data output by the sensing unit 131, the characteristic parameters of the sensing unit 131, and the setting parameters of the analog oscillation unit 132, the sensing detection data collected by the sensing unit 131 is obtained.

[0101] The second embodiment of the present application provides an underwater sensing and transmitting integrated backscattering communication method, such as Figure 6 As shown, the communication method includes the communication system described in any of the above embodiments, and specifically includes the following steps:

[0102] S1, providing an underwater passive backscatter node 100, wherein the underwater passive backscatter node 100 includes a signal conversion module 110, an energy storage module 120 and a load module 130.

[0103] S2, using the transmitter module 200 to transmit an excitation signal to the underwater passive backscatter node 100, so that the signal conversion module 110 responds to the excitation signal and outputs a first signal to charge the energy storage module 120.

[0104] S3 , the load module 130 , under the power supply and drive of the energy storage module 120 , collects and acquires the sensor detection data of the underwater environment, and converts the sensor detection data into the frequency parameters of the control signal for the signal conversion module 110 .

[0105] S4, the signal conversion module 110 shifts and modulates the excitation signal based on the control signal, and reflects and outputs a second signal to the receiver module 300.

[0106] S5, the receiver module 300 receives the second signal and demodulates the spectrum of the second signal to obtain sensing detection data.

[0107] Among them, the signal conversion module 110 shifts and modulates the excitation signal based on the control signal, and the method of forming the second signal adopts a continuous frequency shift keying modulation method, so that in the process of information transmission using the communication system, it has the advantages of strong anti-interference ability, insensitivity to long-distance signal strength attenuation, concentrated energy distribution, and tolerance to multipath propagation.

[0108] In summary, the present application provides an underwater sensing-integrated backscatter communication system and method, the communication system includes an underwater passive backscatter node 100 composed of a signal conversion module 110, an energy storage module 120 and a load module 130, and uses the energy storage module 120 to convert the first signal output by the signal conversion module 110 in the first state into a stable electrical signal for storage, thereby driving the load module 130 to collect and acquire sensor detection data, and map the sensor detection data to the output control signal, so as to control the signal conversion module 110 to switch between the first state and the second state, and modulate the sensor detection data to the second signal output by the control signal conversion module 110 in the second state. The underwater sensing-integrated backscatter communication system provided by the present application reduces the power consumption of the underwater passive backscatter node 100, and improves the accuracy and timeliness of the underwater sensing-integrated backscatter communication system.

[0109] Furthermore, the second signal in the present application is a control signal formed by modulating the excitation signal using a continuous frequency shift keying modulation method, thereby modulating the sensor detection data mapped in the control signal into the frequency difference between the excitation signal and the second signal, so that the second signal has the advantages of strong anti-interference ability, insensitivity to long-distance signal strength attenuation, concentrated energy distribution, and tolerance to multipath propagation.

[0110] Furthermore, the sensor detection data collected by the sensor unit 131 in the present application is based on a sensing-sensing integrated mapping method of a fully analog circuit, and is directly mapped to the control signal output by the analog oscillation unit, so there is no quantization error, ADC error data clipping and other processes, thereby ensuring that the sensor data is losslessly and continuously mapped to the subcarrier shift frequency, and the mapping process is a continuous process. The sensor detection data collected by the sensor is transmitted back and updated at an infinitely high frequency, thereby greatly improving the real-time performance of the sensor data update.

[0111] In the description of the aforementioned embodiments, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0112] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

Claims

1. An underwater sensing and transmitting integrated backscatter communication system, characterized in that: The communication system includes an underwater passive backscatter node, and the underwater passive backscatter node includes a signal conversion module, an energy storage module and a load module; wherein, The signal conversion module includes a first state and a second state, the signal conversion module outputs a first signal in the first state, and outputs a second signal in the second state; The energy storage module is used to receive the first signal and convert the first signal into a stably stored electrical signal to provide power for the operation of the load module; The load module is driven by the energy storage module to obtain sensor detection data and convert the sensor detection data into a control signal for the signal conversion module to control the signal conversion module to switch between the first state and the second state.

2. The communication system according to claim 1, characterized in that The communication system also includes a transmitter module and a receiver module; the transmitter module is used to transmit an excitation signal to the signal conversion module to excite the signal conversion module to a first state; the receiver module is used to receive the second signal to parse the sensor detection data acquired by the load module according to the second signal.

3. The communication system according to claim 2, characterized in that The load module includes a sensing unit and an analog oscillation unit; the sensing unit, under the power supply and drive of the energy storage module, outputs the acquired sensing detection data to the analog oscillation unit, and the analog oscillation unit converts the sensing detection data into the frequency parameters of the control signal based on the mapping relationship between the sensing detection data, the characteristic parameters of the sensing unit, and the setting parameters of the analog oscillation unit.

4. The communication system according to claim 3, characterized in that: The sensing unit includes at least any one of a resistive sensor and a capacitive sensor, and the physical characteristic parameter of the sensing unit includes a change parameter of a resistance value or a capacitance value.

5. The communication system according to claim 2, characterized in that: The signal conversion module includes an underwater acoustic signal transducer and a switch component, wherein the switch component is used to receive the control signal and can switch between an on state and an off state based on the control signal; wherein, When the switch assembly is in the on state, the signal conversion module is in the first state, and the hydroacoustic signal transducer outputs the first signal to the energy storage module; When the switch assembly is in the off state, the signal conversion module is in the second state, and the hydroacoustic signal transducer outputs the second signal to the receiver module.

6. The communication system according to claim 5, characterized in that: The control signal is a periodic square wave signal, which drives the switch component to switch between an on state and an off state to modulate the excitation signal received by the signal conversion module and reflect and output the second signal to the receiver module.

7. The communication system according to claim 2, characterized in that: The energy storage module includes a rectifier unit, a voltage stabilizing unit and an energy storage unit connected in sequence; wherein, The rectifying unit is used to receive the first signal and convert the first signal into a direct current signal; The voltage stabilizing unit is used to receive the DC signal at the input end of the rectifying unit and convert the DC signal into a DC signal of a specific stable voltage; The energy storage unit is used to receive and store the direct current signal with a stable voltage output by the voltage stabilizing unit.

8. An underwater sensing and transmitting integrated backscatter communication method, characterized in that: The communication method comprises: Providing an underwater passive backscatter node, the underwater passive backscatter node comprising a signal conversion module, an energy storage module and a load module; Using a transmitter module to transmit an excitation signal to the underwater passive backscattering node, so that the signal conversion module responds to the excitation signal and outputs a first signal to the energy storage module to charge the energy storage module; The load module, under the power supply and drive of the energy storage module, collects and acquires the sensor detection data of the underwater environment, and converts the sensor detection data into the frequency parameters of the control signal for the signal conversion module; The signal conversion module shifts and modulates the excitation signal based on the control signal, and reflects and outputs a second signal to the receiver module; The receiver module receives the second signal and demodulates the second signal to obtain the sensing detection data.

9. The communication method according to claim 8, characterized in that: The signal conversion module shifts and modulates the excitation signal based on the control signal, and forms the second signal by using a continuous frequency shift keying modulation method.

10. The communication method according to claim 8, characterized in that: The excitation signal comprises a single-frequency sinusoidal wave hydroacoustic signal, and the first signal comprises a single-frequency sinusoidal wave electrical signal.

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