High-speed bionic underwater acoustic communication method and device based on fractional Fourier domain modulation

Abstract

The invention provides a high-speed bionic underwater acoustic communication method and device based on fractional Fourier domain modulation, and relates to the technical field of bionic communication, and the method carries out the phase modulation and amplitude modulation of a to-be-transmitted data signal through a first carrier signal and a second carrier signal in a communication process. In the phase modulation process, the signal is divided into a plurality of time-frequency bands, and is processed in the fractional Fourier domain between the time domain and the frequency domain, so that the concealment of the signal can be enhanced, and the communication rate can be effectively improved on the premise of ensuring the concealment.

Description

Technical Field

[0001] The present application relates to the field of bionic communication technology, and in particular to a high-speed bionic underwater acoustic communication method and device based on fractional-order Fourier domain modulation. Background Art

[0002] Bionic communication uses marine biological acoustic signals as the carrier of information, which means that when the enemy detects the signal, it will be identified as marine environmental noise and excluded. Therefore, it has concealment, which makes bionic communication widely used in military operations such as underwater reconnaissance and anti-submarine warfare. The two main factors affecting the performance of bionic communication are concealment and data rate. On the one hand, the modern marine battlefield is changing rapidly, and the efficient transmission of massive information depends on high data rate; on the other hand, the reduction of our casualties and the increase of the probability of survival on the battlefield depend on the high concealment of communication. Its evaluation indicators mainly include correlation coefficient and perceptual evaluation of audio quality (PEAQ). The former represents the correlation between the modulated signal and the original marine biological acoustic signal, and the latter represents the similarity between the two from the auditory difference.

[0003] However, high concealment and high data rate are often contradictory. In order to achieve high concealment, the existing modulation method generally adopts an incoherent communication method, but its communication rate is relatively low and cannot ensure high-speed underwater communication. If a coherent communication method with a higher communication rate is used for modulation, the concealment of the communication will be affected: first, the rapidly changing phase will cause serious distortion to the original sound signal and reduce the correlation coefficient; second, the rapidly changing phase will also cause phase dispersion, thereby reducing the PEAQ value. Therefore, solving the contradiction between high concealment and high data rate and exploring bionic communication methods that meet the current needs of underwater high-speed covert communication are the main goals of improving the performance of bionic communications. Summary of the invention

[0004] The purpose of this application is to provide a high-speed bionic underwater acoustic communication method and device based on fractional Fourier domain modulation, which can effectively ensure concealment and security while avoiding the reduction of communication rate, and better solve the contradiction between high concealment and high data rate in previous bionic communication methods.

[0005] To achieve the above objectives, this application provides the following solutions:

[0006] In a first aspect, the present application provides a high-speed bionic underwater acoustic communication method based on fractional-order Fourier domain modulation, wherein the execution subject of the high-speed bionic underwater acoustic communication method based on fractional-order Fourier domain modulation is a transmitting end, and the high-speed bionic underwater acoustic communication method based on fractional-order Fourier domain modulation includes:

[0007] Dividing the data signal to be sent into two parts to obtain a first data signal and a second data signal, wherein the first data signal includes a plurality of segments of first data sub-signals, and the second data signal includes a plurality of segments of second data sub-signals;

[0008] For each of the first data sub-signals, the first carrier signal and the first data sub-signal are divided in the time domain to obtain a plurality of first time period carrier signals and first time period data sub-signals;

[0009] Divide each of the first time period carrier signals in the frequency domain to obtain a plurality of time-frequency segment carrier signals, wherein each of the time-frequency segment carrier signals refers to each frequency segment carrier signal in any of the first time period carrier signals;

[0010] Performing phase modulation based on the fractional Fourier domain on each of the time-frequency segment carrier signals according to the first time period data sub-signal to obtain a phase modulated sub-signal;

[0011] splicing all the phase modulated sub-signals to obtain a phase modulated signal corresponding to each of the first data sub-signals;

[0012] Amplitude modulate the second carrier signal according to each of the second data sub-signals to obtain an amplitude modulated signal corresponding to each of the second data sub-signals;

[0013] Splicing all the phase modulation signals and the amplitude modulation signals to obtain a modulation signal;

[0014] The modulated signal is sent to a receiving end, wherein the receiving end is used to demodulate the modulated signal.

[0015] In a second aspect, the present application provides a high-speed bionic underwater acoustic communication method based on fractional-order Fourier domain modulation, wherein the execution subject of the high-speed bionic underwater acoustic communication method based on fractional-order Fourier domain modulation is a receiving end, and the high-speed bionic underwater acoustic communication method based on fractional-order Fourier domain modulation includes:

[0016] Demodulating a modulated signal sent by a transmitting end, wherein the transmitting end is used to:

[0017] Dividing the data signal to be sent into two parts to obtain a first data signal and a second data signal, wherein the first data signal includes a plurality of segments of first data sub-signals, and the second data signal includes a plurality of segments of second data sub-signals;

[0018] For each of the first data sub-signals, the first carrier signal and the first data sub-signal are divided in the time domain to obtain a plurality of first time period carrier signals and first time period data sub-signals;

[0019] Divide each of the first time period carrier signals in the frequency domain to obtain a plurality of time-frequency segment carrier signals, wherein each of the time-frequency segment carrier signals refers to each frequency segment carrier signal in any of the first time period carrier signals;

[0020] Performing phase modulation based on the fractional Fourier domain on each of the time-frequency segment carrier signals according to the first time period data sub-signal to obtain a phase modulated sub-signal;

[0021] splicing all the phase modulated sub-signals to obtain a phase modulated signal corresponding to each of the first data sub-signals;

[0022] Amplitude modulate the second carrier signal according to each of the second data sub-signals to obtain an amplitude modulated signal corresponding to each of the second data sub-signals;

[0023] All the phase modulation signals and the amplitude modulation signals are concatenated to obtain a modulated signal.

[0024] In a third aspect, the present application provides a high-speed bionic underwater acoustic communication device based on fractional-order Fourier domain modulation, comprising: a transmitting end and a receiving end;

[0025] The transmitting end is connected to the receiving end;

[0026] The transmitting end is used for:

[0027] Dividing the data signal to be sent into two parts to obtain a first data signal and a second data signal, wherein the first data signal includes a plurality of segments of first data sub-signals, and the second data signal includes a plurality of segments of second data sub-signals;

[0028] For each of the first data sub-signals, the first carrier signal and the first data sub-signal are divided in the time domain to obtain a plurality of first time period carrier signals and first time period data sub-signals;

[0029] Divide each of the first time period carrier signals in the frequency domain to obtain a plurality of time-frequency segment carrier signals, wherein each of the time-frequency segment carrier signals refers to each frequency segment carrier signal in any of the first time period carrier signals;

[0030] Performing phase modulation based on the fractional Fourier domain on each of the time-frequency segment carrier signals according to the first time period data sub-signal to obtain a phase modulated sub-signal;

[0031] splicing all the phase modulated sub-signals to obtain a phase modulated signal corresponding to each of the first data sub-signals;

[0032] Amplitude modulate the second carrier signal according to each of the second data sub-signals to obtain an amplitude modulated signal corresponding to each of the second data sub-signals;

[0033] All the phase modulation signals and the amplitude modulation signals are concatenated to obtain a modulated signal.

[0034] In a fourth aspect, the present application provides a computer device comprising: a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the computer program to implement the high-speed bionic underwater acoustic communication method based on fractional-order Fourier domain modulation as described in the first or second aspect above.

[0035] In a fifth aspect, the present application provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the high-speed bionic underwater acoustic communication method based on fractional-order Fourier domain modulation as described in the first aspect or the second aspect above.

[0036] According to the specific embodiments provided in this application, this application has the following technical effects:

[0037] The present application provides a high-speed bionic underwater acoustic communication method and device based on fractional Fourier domain modulation, in which the method uses the data signal to be sent to perform phase modulation and amplitude modulation on the first carrier signal and the second carrier signal during the communication process. In the phase modulation process, the signal is divided into multiple time-frequency segments, and processed in the fractional Fourier domain between the time domain and the frequency domain, which can not only enhance the concealment of the signal, but also effectively improve the communication rate while ensuring the concealment. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0039] Figure 1 A flowchart of a high-speed bionic underwater acoustic communication method based on fractional-order Fourier domain modulation provided in Example 1 of the present application;

[0040] Figure 2 A flow chart of phase modulation in a high-speed bionic underwater acoustic communication method based on fractional-order Fourier domain modulation provided in Example 1 of the present application;

[0041] Figure 3 It is a time-frequency diagram of the whistle carrier signal in Example 1 of the present application;

[0042] Figure 4 This is a time-frequency diagram of the signal after QPSK modulation in Example 1 of the present application;

[0043] FIG5( a) is a time domain waveform diagram of a whistle carrier signal in Example 1 of the present application;

[0044] FIG5( b) is a time domain waveform diagram of a QPSK modulated signal in Example 1 of the present application;

[0045] FIG6( a) is a time domain waveform diagram of a click carrier signal in Example 1 of the present application;

[0046] FIG6( b ) is a time domain waveform diagram of the amplitude modulation signal in Example 1 of the present application;

[0047] Figure 7 A schematic diagram of the structure of a computer device provided in Example 5 of the present application. DETAILED DESCRIPTION

[0048] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0049] In order to make the above-mentioned objects, features and advantages of the present application more obvious and easy to understand, the present application is further described in detail below with reference to the accompanying drawings and specific implementation methods.

[0050] Example 1

[0051] like Figure 1 As shown, this embodiment provides a high-speed bionic underwater acoustic communication method based on fractional-order Fourier domain modulation, comprising the following steps:

[0052] A1: The transmitting end divides the data signal to be transmitted into two parts to obtain a first data signal and a second data signal, wherein the first data signal includes several segments of first data sub-signals, and the second data signal includes several segments of second data sub-signals.

[0053] A2: For each of the first data sub-signals, the first carrier signal and the first data sub-signal are divided in the time domain to obtain a plurality of first-time period carrier signals and first-time period data sub-signals, wherein the first carrier signal is a dolphin whistle signal.

[0054] A3: Divide each of the first time period carrier signals in the frequency domain to obtain a plurality of time-frequency segment carrier signals, wherein each of the time-frequency segment carrier signals refers to each frequency segment carrier signal in any of the first time period carrier signals.

[0055] A4: Performing phase modulation based on the fractional Fourier domain on each of the time-frequency segment carrier signals according to the first time period data sub-signal to obtain a phase modulated sub-signal.

[0056] A4 specifically includes:

[0057] A41: For each of the time-frequency segment carrier signals, perform a first fractional-order Fourier transform on the current time-frequency segment carrier signal to obtain a fractional domain amplitude and a first phase, wherein the order of the first fractional-order Fourier transform of each of the time-frequency segment carrier signals is different.

[0058] A42: Calculate the phase difference based on the first phase and the second phase, wherein the second phase is the phase of the carrier signal in the adjacent first time period, and the carrier signal in the adjacent first time period is the time-frequency segment carrier signal in the frequency band of the current time-frequency segment carrier signal and is adjacent to the time period of the current time-frequency segment carrier signal.

[0059] A43: Calculate the current time-frequency band modulation phase signal according to the phase of the target first time period data sub-signal and the phase difference, wherein the target first time period data sub-signal is the first time period data sub-signal having the same time period as the current time-frequency band carrier signal.

[0060] A44: Reconstruct the current time-frequency band fractional domain signal according to the fractional domain amplitude and the current time-frequency band modulation phase signal.

[0061] A45: Perform a second fractional-order Fourier transform on the current time-frequency fractional domain signal to obtain a phase modulated sub-signal, wherein the order of the first fractional-order Fourier transform and the order of the second fractional-order Fourier transform are opposite to each other.

[0062] A5: Concatenate all the phase modulated sub-signals to obtain a phase modulated signal corresponding to each of the first data sub-signals.

[0063] A6: Amplitude modulate the second carrier signal according to each of the second data sub-signals to obtain an amplitude modulated signal corresponding to each of the second data sub-signals, wherein the second carrier signal is a dolphin click signal.

[0064] A6 specifically includes:

[0065] The envelope of the second carrier signal is multiplied by each of the second data sub-signals to obtain an amplitude modulation signal corresponding to each of the second data sub-signals.

[0066] A7: Concatenate all the phase modulation signals and the amplitude modulation signals to obtain a modulated signal.

[0067] A7 specifically includes:

[0068] A71: All the phase modulation signals are spliced ​​in order, and a blank gap of a preset length is inserted between two adjacent phase modulation signals to obtain a final phase modulation signal.

[0069] A72: All the amplitude modulated signals are spliced ​​in order, and a blank gap of a preset length is inserted between two adjacent amplitude modulated signals to obtain a final amplitude modulated signal.

[0070] A73: Concatenate the final phase modulation signal and the final amplitude modulation signal to obtain a first modulation signal.

[0071] A74: Add a synchronization header to the first modulated signal to obtain a modulated signal.

[0072] A8: The receiving end receives the modulated signal and demodulates the modulated signal.

[0073] This embodiment adopts the above steps A1-A8, and combines the short-term burst dolphin tick signal and the long-term continuous dolphin whistle signal during the communication process to perform phase modulation and amplitude modulation respectively. The phase modulation is performed in the fractional Fourier domain, and the signal is divided into multiple time-frequency segments for processing. The phase difference between adjacent signal segments is used to compensate for phase dispersion, and the order of the fractional Fourier transform of each signal segment is continuously changed. In addition, after the modulation is completed, a certain blank gap is inserted between two adjacent phase modulated signals or two adjacent amplitude modulated signals, which can better imitate the acoustic characteristics of dolphins. This method can avoid the problem of reduced correlation coefficients and audio quality perception evaluation values ​​between bionic signals and original marine biological sound signals caused by traditional phase modulation methods, and improve the data rate while ensuring the concealment and security of communication.

[0074] In order to make the specific implementation process of the high-speed bionic underwater acoustic communication method based on fractional Fourier domain modulation more clear to those skilled in the art, the following Figure 2-Figure 6(b) Provide specific explanation.

[0075] S1: The transmitter sends the modulated signal S1 specifically includes:

[0076] S101: Divide the data signal x(n) into signals xi (n) (i=1, 3, 5, ..., 2I-1) (i.e., the first data signal, which includes a plurality of first data sub-signals) and signal x j (n)(j=2,4,6,…,2J) (i.e., the second data signal, which includes a plurality of second data sub-signals), for signal x i (n) and signal x j (n) are phase modulated and amplitude modulated respectively. Take two segments of the first data sub-signal x1(n) and the second data sub-signal x2(n) as an example for explanation. The first carrier signal of the phase modulation process is the dolphin whistle signal s1(n), and the first data sub-signal is x1(n); the second carrier signal of the amplitude modulation process is the dolphin click signal s2(n), and the second data sub-signal is x2(n).

[0077] S102: Segment the first carrier signal s1(n) and the first data sub-signal x1(n) in the time domain to determine the number of time periods M and the duration T of each segment. seg , get the carrier signal s of M time periods 1i (n) and data signal x 1i In this embodiment, the first carrier signal s1(n) and the first data sub-signal x1(n) are divided into 155 time periods, each of which is 155. 1i (n) and data signal x 1i (n) duration T seg It is 0.001s.

[0078] S103: The carrier signal s of each time period 1i (n) Segment in the frequency domain to determine the number of frequency bands N and the boundary frequency f of each band j (j=1,2,…,N-1), get the carrier signal s 1_i,j (n) (i.e., the carrier signal of the instantaneous frequency band). In this embodiment, the carrier signal s of each time period is 1i The number of frequency bands N into which the first carrier signal s1(n) is divided is 4, and the boundary frequencies of each frequency band are f1=6kHz, f2=10kHz, and f3=14kHz. The time-frequency diagram of the first carrier signal s1(n) is shown in Figure 3 shown.

[0079] S104: Determine the phase modulation mode and the order p of the fractional Fourier transform of each signal segment i,j In this embodiment, the phase modulation mode is QPSK.

[0080] S105: Perform phase modulation based on the fractional Fourier domain on the first data sub-signal x1(n) to obtain a QPSK modulated signal (i.e. phase modulated signal). The time-frequency diagram of Figure 4 As shown, the first carrier signal s1(n) and the QPSK modulated signal The time domain waveforms of are shown in Figure 5(a) and Figure 5(b). The phase modulation process is as follows Figure 2 As shown, S105 specifically includes:

[0081] (1) For the carrier signal s in the i-th time period and the j-th frequency band 1_i,j (n) do p i,j The fractional Fourier transform is performed to obtain the corresponding fractional domain amplitude A. i,j (u) and phase And calculate the phase difference between adjacent time period signals in the frequency band

[0082]

[0083] (2) According to the data signal x in the i-th period 1i Phase of (n) Calculate the modulated phase signal

[0084]

[0085] (3) Reconstruct the fractional domain signal The reconstruction process is:

[0086]

[0087] (4) Yes do -p i,j The phase modulated sub-signal is obtained by fractional Fourier transform.

[0088] (5) Each phase modulated sub-signal The phase modulation signal corresponding to the first data sub-signal x1(n) is obtained by splicing

[0089] For other data sub-signals x in the first data signal i (n)(i=3,5,…,2I-1), the same phase modulation method is used to process and obtain QPSK modulated signals respectively.

[0090] S106: Multiply the second data sub-signal x2(n) by the envelope μ of the dolphin click sound signal s2(n) (i.e., the second carrier signal) to obtain an amplitude modulated signal

[0091] The expression of the dolphin click sound signal envelope is:

[0092]

[0093] Where μ(t) is the envelope of the dolphin click signal, A is the amplitude coefficient of the signal, t0 is the time center of the signal, and Δτ is the width coefficient of the signal. The time domain waveform is as follows Figure 6(a) and 6(b) shown.

[0094] For other data sub-signals x in the second data signal j (n)(j=4,6,…,2J), the same amplitude modulation processing method is used to process, and the amplitude modulation signals are obtained respectively.

[0095] S107: The signal segments are spliced ​​together in sequence, and a certain blank gap is inserted between two adjacent phase modulated signals to determine the duration T of the blank gap. blk1 , and the final phase modulated signal is obtained Will The signal segments are spliced ​​together in sequence, and a certain blank gap is inserted between two adjacent amplitude modulated signals to determine the duration T of the blank gap. blk2 , and the final amplitude modulated signal is obtained

[0096] In this embodiment, the purpose of inserting a certain blank gap is to make the modulated signal better imitate the acoustic characteristics of dolphins, further improve the correlation coefficient and PEAQ value of the modulated signal and the original biological sound signal, and prevent the signal from being interfered during the transmission process. By accurately controlling the length of this blank gap, it can be ensured that the signal can be correctly identified and processed at the receiving end, thereby improving the quality and efficiency of communication.

[0097] S108: The final phase modulated signal and the final amplitude modulated signal Splice them together to get the first modulated signal

[0098] S109: The first modulated signal Add the synchronization header to get the final transmission signal The synchronization head used is the dolphin whistle signal.

[0099] The purpose of the synchronization header is to help the receiving end correctly identify and synchronize the starting position of the signal when receiving the signal, ensuring the integrity and accurate transmission of the information.

[0100] S110: The signal It is transmitted into the hydroacoustic channel through the transmitting transducer.

[0101] S2: The receiving end receives the signal and demodulate it.

[0102] S201: Perform synchronization processing on the received signal to obtain a synchronized signal

[0103] S202: Removal The blank gap in the middle and the signal of the symbol period length are taken out in sequence to obtain

[0104]

[0105] S203: According to the division method of the sending end, Phase Modulation Signal and amplitude modulated signals Processing, phase demodulation and amplitude demodulation are performed respectively to obtain the phase demodulation signal x ci (n)(i=1,3,5…,2I-1) and amplitude demodulated signal x cj (n)(j=2,4,6…,2J).

[0106] S204: x ci (n)(i=1,3,5…,2I-1) and x cj (n)(j=2,4,6…,2J) are concatenated to obtain the final demodulated signal x c (n).

[0107] Traditional communication modulation methods usually use the time domain or frequency domain, and this embodiment introduces the fractional Fourier transform (FrFT), which is a modulation method between the time domain and the frequency domain. By adjusting the order of FrFT, it is possible to flexibly change between the time domain and the frequency domain, optimize the transmission method of the signal, and provide higher security. The fractional Fourier transform can not only enhance the concealment of the signal (by changing the propagation characteristics of the signal so that it is not easily detected by the traditional receiving system), but also effectively improve the communication rate while ensuring concealment, because it is more flexible in representing the signal and can avoid the rate loss caused by the limitations of the traditional time domain or frequency domain.

[0108] During the communication process, the phase change between adjacent signal segments may cause phase dispersion, affecting the decoding effect of the signal. This embodiment processes the signal in segments and uses the phase difference between adjacent signal segments to compensate for phase dispersion. This processing method can effectively maintain the concealment and stability of the signal. By compensating for phase dispersion, the reduction of concealment due to phase distortion is avoided, while maintaining an efficient phase modulation method, effectively reducing the rate drop caused by signal distortion.

[0109] After the modulation is completed, blank gaps are inserted between adjacent segmented modulated signals to imitate the acoustic characteristics of dolphins. This design not only makes the signal closer to the sound signal of natural marine life and improves the correlation with the original marine life sound signal, but also avoids spectrum congestion to a certain extent, making the signal transmission more stable. The insertion of blank gaps makes the signal more difficult to detect when propagating in water, increases its concealment, and does not significantly reduce the data rate in this way, but improves the quality and recognition of the signal.

[0110] The high-speed bionic underwater acoustic communication method based on fractional Fourier domain modulation provided in this embodiment combines short-term burst dolphin tick signals and long-term continuous dolphin whistle signals during the communication process, and performs phase modulation and amplitude modulation respectively. In the phase modulation process, the phase dispersion caused by the phase change between adjacent signal segments is considered, and the phase dispersion is compensated by dividing the signal into multiple time-frequency segments for processing, thereby ensuring the concealment of the phase modulation. At the same time, the phase modulation is not performed in the commonly used time domain or frequency domain, but in the fractional Fourier domain between the two, and the safety of the phase modulation is ensured by continuously changing the order of the fractional Fourier transform (FrFT) of each segment signal. In addition, after the modulation is completed, a certain blank gap is inserted between adjacent segmented modulated signals to better imitate the acoustic characteristics of dolphins, further improving the correlation coefficient and PEAQ value of the modulated signal with the original marine biological sound signal. This method can effectively ensure concealment and security while avoiding the reduction of communication rate, and better solves the contradiction between high concealment and high data rate in previous bionic communication methods.

[0111] Example 2

[0112] This embodiment provides a high-speed bionic underwater acoustic communication method based on fractional-order Fourier domain modulation. The execution subject of the high-speed bionic underwater acoustic communication method based on fractional-order Fourier domain modulation is a transmitting end. The high-speed bionic underwater acoustic communication method based on fractional-order Fourier domain modulation includes the following steps:

[0113] A1: Divide the data signal to be sent into two parts to obtain a first data signal and a second data signal, wherein the first data signal includes several segments of first data sub-signals, and the second data signal includes several segments of second data sub-signals.

[0114] A2: For each of the first data sub-signals, the first carrier signal and the first data sub-signal are divided in the time domain to obtain a plurality of first-time period carrier signals and first-time period data sub-signals.

[0115] A3: Divide each of the first time period carrier signals in the frequency domain to obtain a plurality of time-frequency segment carrier signals, wherein each of the time-frequency segment carrier signals refers to each frequency segment carrier signal in any of the first time period carrier signals.

[0116] A4: Performing phase modulation based on the fractional Fourier domain on each of the time-frequency segment carrier signals according to the first time period data sub-signal to obtain a phase modulated sub-signal.

[0117] A5: Concatenate all the phase modulated sub-signals to obtain a phase modulated signal corresponding to each of the first data sub-signals.

[0118] A6: Perform amplitude modulation on the second carrier signal according to each of the second data sub-signals to obtain an amplitude modulation signal corresponding to each of the second data sub-signals.

[0119] A7: Concatenate all the phase modulation signals and the amplitude modulation signals to obtain a modulated signal.

[0120] A8: Send the modulated signal to a receiving end, wherein the receiving end is used to demodulate the modulated signal.

[0121] This embodiment and Embodiment 1 are based on the same inventive concept, and the implementation solution for solving the problem provided by this embodiment is similar to the implementation solution recorded in Embodiment 1. Therefore, the specific process of the high-speed bionic underwater acoustic communication method based on fractional-order Fourier domain modulation in this embodiment can be referred to the definition in Embodiment 1 and will not be repeated here.

[0122] (1) This embodiment combines the short-duration burst dolphin tick signal and the long-duration continuous dolphin whistle signal during the communication process, and performs phase modulation and amplitude modulation respectively, thereby avoiding the problem of a single carrier form in traditional bionic communication methods.

[0123] (2) This embodiment performs phase modulation in the fractional Fourier domain and divides the signal into multiple time-frequency segments for processing. It uses the phase difference between adjacent signal segments to compensate for phase dispersion and continuously changes the order of the FrFT of each signal segment, thereby effectively ensuring the concealment and security of communication while maintaining a relatively high data rate.

[0124] (3) This embodiment can better imitate the acoustic characteristics of dolphins by inserting a certain blank gap into the modulated signal, and further improve the correlation coefficient and PEAQ value between the modulated signal and the original marine biological sound signal.

[0125] Example 3

[0126] This embodiment provides a high-speed bionic underwater acoustic communication method based on fractional-order Fourier domain modulation. The execution subject of the high-speed bionic underwater acoustic communication method based on fractional-order Fourier domain modulation is a receiving end. The high-speed bionic underwater acoustic communication method based on fractional-order Fourier domain modulation includes:

[0127] Demodulating a modulated signal sent by a transmitting end, wherein the transmitting end is used to:

[0128] Dividing the data signal to be sent into two parts to obtain a first data signal and a second data signal, wherein the first data signal includes a plurality of segments of first data sub-signals, and the second data signal includes a plurality of segments of second data sub-signals;

[0129] For each of the first data sub-signals, the first carrier signal and the first data sub-signal are divided in the time domain to obtain a plurality of first time period carrier signals and first time period data sub-signals;

[0130] Divide each of the first time period carrier signals in the frequency domain to obtain a plurality of time-frequency segment carrier signals, wherein each of the time-frequency segment carrier signals refers to each frequency segment carrier signal in any of the first time period carrier signals;

[0131] Performing phase modulation based on the fractional Fourier domain on each of the time-frequency segment carrier signals according to the first time period data sub-signal to obtain a phase modulated sub-signal;

[0132] splicing all the phase modulated sub-signals to obtain a phase modulated signal corresponding to each of the first data sub-signals;

[0133] Amplitude modulate the second carrier signal according to each of the second data sub-signals to obtain an amplitude modulated signal corresponding to each of the second data sub-signals;

[0134] All the phase modulation signals and the amplitude modulation signals are concatenated to obtain a modulated signal.

[0135] This embodiment and Embodiment 1 are based on the same inventive concept, and the implementation solution for solving the problem provided by this embodiment is similar to the implementation solution recorded in Embodiment 1. Therefore, the specific process of the high-speed bionic underwater acoustic communication method based on fractional-order Fourier domain modulation in this embodiment can be referred to the definition in Embodiment 1 and will not be repeated here.

[0136] Example 4

[0137] This embodiment provides a high-speed bionic underwater acoustic communication device based on fractional-order Fourier domain modulation, including: a transmitting end and a receiving end;

[0138] The transmitting end is connected to the receiving end;

[0139] The transmitting end is used for:

[0140] Dividing the data signal to be sent into two parts to obtain a first data signal and a second data signal, wherein the first data signal includes a plurality of segments of first data sub-signals, and the second data signal includes a plurality of segments of second data sub-signals;

[0141] For each of the first data sub-signals, the first carrier signal and the first data sub-signal are divided in the time domain to obtain a plurality of first time period carrier signals and first time period data sub-signals;

[0142] Divide each of the first time period carrier signals in the frequency domain to obtain a plurality of time-frequency segment carrier signals, wherein each of the time-frequency segment carrier signals refers to each frequency segment carrier signal in any of the first time period carrier signals;

[0143] Performing phase modulation based on the fractional Fourier domain on each of the time-frequency segment carrier signals according to the first time period data sub-signal to obtain a phase modulated sub-signal;

[0144] splicing all the phase modulated sub-signals to obtain a phase modulated signal corresponding to each of the first data sub-signals;

[0145] Amplitude modulate the second carrier signal according to each of the second data sub-signals to obtain an amplitude modulated signal corresponding to each of the second data sub-signals;

[0146] Splicing all the phase modulation signals and the amplitude modulation signals to obtain a modulation signal;

[0147] The receiving end is used to demodulate the modulated signal.

[0148] This embodiment and Embodiment 1 are based on the same inventive concept, and the implementation solution for solving the problem provided by this embodiment is similar to the implementation solution recorded in Embodiment 1. Therefore, the specific process of the high-speed bionic underwater acoustic communication method based on fractional-order Fourier domain modulation in this embodiment can be referred to the definition in Embodiment 1 and will not be repeated here.

[0149] Example 5

[0150] This embodiment provides a computer device, which may be a server or a terminal. Its internal structure diagram may be as follows: Figure 7 As shown. The computer device includes a processor, a memory, an input / output interface (Input / Output, referred to as I / O) and a communication interface. Among them, the processor, the memory and the input / output interface are connected through a system bus, and the communication interface is connected to the system bus through the input / output interface. Among them, the processor of the computer device is used to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system, a computer program and a database. The internal memory provides an environment for the operation of the operating system and the computer program in the non-volatile storage medium. The database of the computer device is used to store data in the high-speed bionic underwater acoustic communication method based on fractional-order Fourier domain modulation provided in Example 2 or Example 3. The input / output interface of the computer device is used to exchange information between the processor and an external device. The communication interface of the computer device is used to communicate with an external terminal through a network connection. When the computer program is executed by the processor, the high-speed bionic underwater acoustic communication method based on fractional-order Fourier domain modulation provided in Example 2 or Example 3 is implemented.

[0151] Those skilled in the art will understand that Figure 7 The structure shown in the figure is only a block diagram of a part of the structure related to the solution of the present application, and does not constitute a limitation on the computer device to which the solution of the present application is applied. The specific computer device may include more or fewer components than those shown in the figure, or combine certain components, or have a different arrangement of components. In an exemplary embodiment, a computer device is provided, including a memory and a processor, wherein a computer program is stored in the memory, and the processor implements the steps in the above-mentioned method embodiments when executing the computer program.

[0152] Example 6

[0153] This embodiment provides a computer-readable storage medium storing a computer program. When the computer program is executed by a processor, the high-speed bionic underwater acoustic communication method based on fractional-order Fourier domain modulation provided in the above-mentioned embodiment 2 or embodiment 3 is implemented.

[0154] Example 7

[0155] This embodiment provides a computer program product, including a computer program. When the computer program is executed by a processor, it implements the high-speed bionic underwater acoustic communication method based on fractional Fourier domain modulation provided in the above-mentioned embodiment 2 or embodiment 3.

[0156] It should be noted that the user information (including but not limited to user device information, user personal information, etc.) and data (including but not limited to data used for analysis, stored data, displayed data, etc.) involved in this application are all information and data authorized by the user or fully authorized by all parties, and the collection, use and processing of relevant data must comply with relevant regulations.

[0157] Those of ordinary skill in the art can understand that all or part of the processes in the above-mentioned embodiment methods can be completed by instructing the relevant hardware through a computer program, and the computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the embodiments of the above-mentioned methods. Among them, any reference to the memory, database or other medium used in the embodiments provided in the present application can include at least one of non-volatile and volatile memory. Non-volatile memory can include read-only memory (ROM), magnetic tape, floppy disk, flash memory, optical memory, high-density embedded non-volatile memory, resistive random access memory (ReRAM), magnetic random access memory (MRAM), ferroelectric random access memory (FRAM), phase change memory (PCM), graphene memory, etc. Volatile memory can include random access memory (RAM) or external cache memory, etc. By way of illustration and not limitation, RAM may be in various forms, such as static random access memory (SRAM) or dynamic random access memory (DRAM).

[0158] The database involved in each embodiment provided in this application may include at least one of a relational database and a non-relational database. The non-relational database may include a distributed database based on blockchain, etc., but is not limited thereto. The processor involved in each embodiment provided in this application may be a general-purpose processor, a central processing unit, a graphics processor, a digital signal processor, a programmable logic device, a data processing logic device based on quantum computing, etc., but is not limited thereto.

[0159] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0160] This article uses specific examples to illustrate the principles and implementation methods of this application. The description of the above embodiments is only used to help understand the method and core ideas of this application. At the same time, for those skilled in the art, according to the ideas of this application, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting this application.

Claims

1. A high-speed bionic underwater acoustic communication method based on fractional Fourier domain modulation, characterized in that: The execution subject of the high-speed bionic underwater acoustic communication method based on fractional-order Fourier domain modulation is a transmitting end, and the high-speed bionic underwater acoustic communication method based on fractional-order Fourier domain modulation includes: Dividing the data signal to be sent into two parts to obtain a first data signal and a second data signal, wherein the first data signal includes a plurality of segments of first data sub-signals, and the second data signal includes a plurality of segments of second data sub-signals; For each of the first data sub-signals, the first carrier signal and the first data sub-signal are divided in the time domain to obtain a plurality of first time period carrier signals and first time period data sub-signals; Divide each of the first time period carrier signals in the frequency domain to obtain a plurality of time-frequency segment carrier signals, wherein each of the time-frequency segment carrier signals refers to each frequency segment carrier signal in any of the first time period carrier signals; Performing phase modulation based on the fractional Fourier domain on each of the time-frequency segment carrier signals according to the first time period data sub-signal to obtain a phase modulated sub-signal; splicing all the phase modulated sub-signals to obtain a phase modulated signal corresponding to each of the first data sub-signals; Amplitude modulate the second carrier signal according to each of the second data sub-signals to obtain an amplitude modulated signal corresponding to each of the second data sub-signals; Splicing all the phase modulation signals and the amplitude modulation signals to obtain a modulation signal; The modulated signal is sent to a receiving end, wherein the receiving end is used to demodulate the modulated signal.

2. The high-speed bionic underwater acoustic communication method based on fractional-order Fourier domain modulation according to claim 1 is characterized in that: Performing phase modulation based on the fractional Fourier domain on each of the time-frequency segment carrier signals according to the first time period data sub-signal to obtain a phase modulated sub-signal specifically includes: For each of the time-frequency segment carrier signals, performing a first fractional-order Fourier transform on the current time-frequency segment carrier signal to obtain a fractional domain amplitude and a first phase; Calculate the phase difference according to the first phase and the second phase, wherein the second phase is the phase of the carrier signal in the adjacent first time period, and the carrier signal in the adjacent first time period is the time-frequency segment carrier signal in the frequency band of the current time-frequency segment carrier signal and adjacent to the time period of the current time-frequency segment carrier signal; Calculate the current time-frequency segment modulation phase signal according to the phase of the target first-time segment data sub-signal and the phase difference, wherein the target first-time segment data sub-signal is the first-time segment data sub-signal of the same time segment as the current time-frequency segment carrier signal; Reconstructing a current time-frequency segment fractional domain signal according to the fractional domain amplitude and the current time-frequency segment modulation phase signal; Perform a second fractional-order Fourier transform on the current time-frequency fractional domain signal to obtain a phase modulated sub-signal, wherein the order of the first fractional-order Fourier transform and the order of the second fractional-order Fourier transform are reciprocal numbers.

3. The high-speed bionic underwater acoustic communication method based on fractional-order Fourier domain modulation according to claim 2 is characterized in that: The order of the first fractional Fourier transform of the carrier signal in each time-frequency segment is different.

4. The high-speed bionic underwater acoustic communication method based on fractional-order Fourier domain modulation according to claim 1 is characterized in that: Amplitude modulating the second carrier signal according to each of the second data sub-signals to obtain an amplitude modulated signal corresponding to each of the second data sub-signals specifically includes: The envelope of the second carrier signal is multiplied by each of the second data sub-signals to obtain an amplitude modulation signal corresponding to each of the second data sub-signals.

5. The high-speed bionic underwater acoustic communication method based on fractional-order Fourier domain modulation according to claim 1 is characterized in that: The first carrier signal is a dolphin whistle signal, and the second carrier signal is a dolphin tick signal.

6. The high-speed bionic underwater acoustic communication method based on fractional-order Fourier domain modulation according to claim 1 is characterized in that: All the phase modulation signals and the amplitude modulation signals are spliced ​​to obtain a modulation signal, which specifically includes: All the phase modulation signals are spliced ​​in sequence, and a blank gap of a preset length is inserted between two adjacent phase modulation signals to obtain a final phase modulation signal; All the amplitude modulated signals are spliced ​​in sequence, and a blank gap of a preset length is inserted between two adjacent amplitude modulated signals to obtain a final amplitude modulated signal; splicing the final phase modulation signal and the final amplitude modulation signal to obtain a first modulation signal; A synchronization header is added to the first modulated signal to obtain a modulated signal.

7. A high-speed bionic underwater acoustic communication method based on fractional Fourier domain modulation, characterized in that: The execution subject of the high-speed bionic underwater acoustic communication method based on fractional-order Fourier domain modulation is a receiving end, and the high-speed bionic underwater acoustic communication method based on fractional-order Fourier domain modulation includes: Demodulating a modulated signal sent by a transmitting end, wherein the transmitting end is used to: Dividing the data signal to be sent into two parts to obtain a first data signal and a second data signal, wherein the first data signal includes a plurality of segments of first data sub-signals, and the second data signal includes a plurality of segments of second data sub-signals; For each of the first data sub-signals, the first carrier signal and the first data sub-signal are divided in the time domain to obtain a plurality of first time period carrier signals and first time period data sub-signals; Divide each of the first time period carrier signals in the frequency domain to obtain a plurality of time-frequency segment carrier signals, wherein each of the time-frequency segment carrier signals refers to each frequency segment carrier signal in any of the first time period carrier signals; Performing phase modulation based on the fractional Fourier domain on each of the time-frequency segment carrier signals according to the first time period data sub-signal to obtain a phase modulated sub-signal; splicing all the phase modulated sub-signals to obtain a phase modulated signal corresponding to each of the first data sub-signals; Amplitude modulate the second carrier signal according to each of the second data sub-signals to obtain an amplitude modulated signal corresponding to each of the second data sub-signals; All the phase modulation signals and the amplitude modulation signals are concatenated to obtain a modulated signal.

8. A high-speed bionic underwater acoustic communication device based on fractional Fourier domain modulation, characterized in that: The high-speed bionic underwater acoustic communication device based on fractional-order Fourier domain modulation includes: a transmitting end and a receiving end; The transmitting end is connected to the receiving end; The transmitting end is used for: Dividing the data signal to be sent into two parts to obtain a first data signal and a second data signal, wherein the first data signal includes a plurality of segments of first data sub-signals, and the second data signal includes a plurality of segments of second data sub-signals; For each of the first data sub-signals, the first carrier signal and the first data sub-signal are divided in the time domain to obtain a plurality of first time period carrier signals and first time period data sub-signals; Divide each of the first time period carrier signals in the frequency domain to obtain a plurality of time-frequency segment carrier signals, wherein each of the time-frequency segment carrier signals refers to each frequency segment carrier signal in any of the first time period carrier signals; Performing phase modulation based on the fractional Fourier domain on each of the time-frequency segment carrier signals according to the first time period data sub-signal to obtain a phase modulated sub-signal; splicing all the phase modulated sub-signals to obtain a phase modulated signal corresponding to each of the first data sub-signals; Amplitude modulate the second carrier signal according to each of the second data sub-signals to obtain an amplitude modulated signal corresponding to each of the second data sub-signals; Splicing all the phase modulation signals and the amplitude modulation signals to obtain a modulation signal; The receiving end is used to demodulate the modulated signal.

9. A computer device comprising: A memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the computer program to implement the high-speed bionic underwater acoustic communication method based on fractional-order Fourier domain modulation as described in any one of claims 1 to 6, or the high-speed bionic underwater acoustic communication method based on fractional-order Fourier domain modulation as described in claim 7.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the high-speed bionic underwater acoustic communication method based on fractional-order Fourier domain modulation described in any one of claims 1 to 6 or the high-speed bionic underwater acoustic communication method based on fractional-order Fourier domain modulation described in claim 7 is implemented.

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