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

Abstract

This application provides a high-speed biomimetic underwater acoustic communication method and apparatus based on fractional Fourier domain modulation, relating to the field of biomimetic communication technology. This method utilizes a first carrier signal and a second carrier signal to perform phase modulation and amplitude modulation on the data signal to be transmitted during communication. During phase modulation, the signal is divided into multiple time-frequency bands and processed in the fractional Fourier domain, which lies between the time and frequency domains. This not only enhances the signal's concealment but also effectively increases the communication rate while maintaining concealment.

Description

Technical Field

[0001] This application relates to the field of biomimetic communication technology, and in particular to a high-speed biomimetic underwater acoustic communication method and device based on fractional Fourier domain modulation. Background Technology

[0002] Biomimetic communication utilizes the acoustic signals of marine organisms as carrier waves, causing the enemy to perceive these signals as marine environmental noise and reject them, thus possessing stealth capabilities. This makes biomimetic communication widely used in military operations such as underwater reconnaissance and anti-submarine warfare. The two main factors affecting the performance of biomimetic communication are stealth and data rate. On the one hand, the modern naval battlefield is constantly changing, and the efficient transmission of massive amounts of information depends on high data rates; on the other hand, reducing casualties and increasing the probability of battlefield survival depends on the high stealth of communication. Its evaluation indicators mainly include two types: 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, while the latter characterizes the similarity between the two based on auditory differences.

[0003] However, high stealth and high data rate are often contradictory. To achieve high stealth, existing modulation methods generally employ incoherent communication, but their communication rates are relatively low, failing to ensure high-speed underwater communication. Conversely, using coherent communication methods with higher communication rates would compromise stealth: firstly, rapidly changing phase would severely distort the original acoustic signal, reducing the correlation coefficient; secondly, rapidly changing phase would also cause phase dispersion, thus lowering the PEAQ value. Therefore, resolving the contradiction between high stealth and high data rate, and exploring biomimetic communication methods that meet the current requirements for high-speed, stealthy underwater communication, is the primary goal for improving biomimetic communication performance. Summary of the Invention

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

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

[0006] In a first aspect, this application provides a high-speed biomimetic underwater acoustic communication method based on fractional Fourier domain modulation. The executing entity of the high-speed biomimetic underwater acoustic communication method based on fractional Fourier domain modulation is a transmitting end, and the high-speed biomimetic underwater acoustic communication method based on fractional Fourier domain modulation includes:

[0007] The data signal to be transmitted is divided into two parts to obtain a first data signal and a second data signal. 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.

[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 several first time period carrier signals and first time period data sub-signals;

[0009] Each first time period carrier signal is divided in the frequency domain to obtain several time-frequency segment carrier signals, wherein each time-frequency segment carrier signal refers to each frequency segment carrier signal in any first time period carrier signal;

[0010] Based on the data sub-signal of the first time period, phase modulation is performed on the carrier signal of each time-frequency segment based on the fractional Fourier domain to obtain the phase modulation sub-signal;

[0011] All the phase modulation sub-signals are spliced ​​together to obtain the phase modulation signal corresponding to each of the first data sub-signals;

[0012] The second carrier signal is amplitude modulated according to each second data sub-signal to obtain the amplitude modulated signal corresponding to each second data sub-signal;

[0013] All the phase modulation signals and the amplitude modulation signals are concatenated to obtain the modulation signal;

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

[0015] Secondly, this application provides a high-speed biomimetic underwater acoustic communication method based on fractional Fourier domain modulation. The executing entity of the high-speed biomimetic underwater acoustic communication method based on fractional Fourier domain modulation is a receiving end, and the high-speed biomimetic underwater acoustic communication method based on fractional Fourier domain modulation includes:

[0016] Demodulate the modulated signal transmitted by the transmitting end, wherein the transmitting end is used for:

[0017] The data signal to be transmitted is divided into two parts to obtain a first data signal and a second data signal. 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.

[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 several first time period carrier signals and first time period data sub-signals;

[0019] Each first time period carrier signal is divided in the frequency domain to obtain several time-frequency segment carrier signals, wherein each time-frequency segment carrier signal refers to each frequency segment carrier signal in any first time period carrier signal;

[0020] Based on the data sub-signal of the first time period, phase modulation is performed on the carrier signal of each time-frequency segment based on the fractional Fourier domain to obtain the phase modulation sub-signal;

[0021] All the phase modulation sub-signals are spliced ​​together to obtain the phase modulation signal corresponding to each of the first data sub-signals;

[0022] The second carrier signal is amplitude modulated according to each second data sub-signal to obtain the amplitude modulated signal corresponding to each second data sub-signal;

[0023] All the phase modulation signals and the amplitude modulation signals are spliced ​​together to obtain the modulation signal.

[0024] Thirdly, this application provides a high-speed biomimetic underwater acoustic communication device based on fractional Fourier domain modulation, comprising: a transmitter and a receiver;

[0025] The transmitting end and the receiving end are connected;

[0026] The sending end is used for:

[0027] The data signal to be transmitted is divided into two parts to obtain a first data signal and a second data signal. 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.

[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 several first time period carrier signals and first time period data sub-signals;

[0029] Each first time period carrier signal is divided in the frequency domain to obtain several time-frequency segment carrier signals, wherein each time-frequency segment carrier signal refers to each frequency segment carrier signal in any first time period carrier signal;

[0030] Based on the data sub-signal of the first time period, phase modulation is performed on the carrier signal of each time-frequency segment based on the fractional Fourier domain to obtain the phase modulation sub-signal;

[0031] All the phase modulation sub-signals are spliced ​​together to obtain the phase modulation signal corresponding to each of the first data sub-signals;

[0032] The second carrier signal is amplitude modulated according to each second data sub-signal to obtain the amplitude modulated signal corresponding to each second data sub-signal;

[0033] All the phase modulation signals and the amplitude modulation signals are spliced ​​together to obtain the modulation signal.

[0034] Fourthly, this application provides a computer device, including: 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 biomimetic underwater acoustic communication method based on fractional Fourier domain modulation as described in the first or second aspect above.

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

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

[0037] This application provides a high-speed biomimetic underwater acoustic communication method and apparatus based on fractional Fourier domain modulation. During communication, this method utilizes the data signal to be transmitted to perform phase modulation and amplitude modulation on a first carrier signal and a second carrier signal. In the phase modulation process, the signal is divided into multiple time-frequency bands and processed in the fractional Fourier domain, which lies between the time and frequency domains. This not only enhances the signal's concealment but also effectively increases the communication rate while maintaining concealment. Attached Figure Description

[0038] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0039] Figure 1 A flowchart of a high-speed biomimetic underwater acoustic communication method based on fractional Fourier domain modulation provided in Embodiment 1 of this application;

[0040] Figure 2 A flowchart of phase modulation in a high-speed biomimetic underwater acoustic communication method based on fractional Fourier domain modulation, provided for Embodiment 1 of this application;

[0041] Figure 3 This is a time-frequency diagram of the whistle carrier signal in Embodiment 1 of this application;

[0042] Figure 4 This is a time-frequency diagram of the QPSK modulated signal in Embodiment 1 of this application;

[0043] Figure 5(a) is a time-domain waveform diagram of the whistle carrier signal in Embodiment 1 of this application;

[0044] Figure 5(b) is a time-domain waveform diagram of the QPSK modulated signal in Embodiment 1 of this application;

[0045] Figure 6(a) is a time-domain waveform diagram of the click carrier signal in Embodiment 1 of this application;

[0046] Figure 6(b) is a time-domain waveform diagram of the amplitude modulation signal in Embodiment 1 of this application;

[0047] Figure 7 This is a schematic diagram of the structure of a computer device provided in Embodiment 5 of this application. Detailed Implementation

[0048] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0049] To make the above-mentioned objectives, features and advantages of this application more apparent and understandable, the application will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0050] Example 1

[0051] like Figure 1 As shown in the figure, this embodiment provides a high-speed biomimetic underwater acoustic communication method based on fractional Fourier domain modulation, which includes 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. 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 several 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 several time-frequency carrier signals, wherein each of the time-frequency carrier signals refers to each frequency band carrier signal in any of the first time period carrier signals.

[0055] A4: Based on the data sub-signal of the first time period, perform phase modulation on the carrier signal of each time-frequency segment based on the fractional Fourier domain to obtain the phase modulation sub-signal.

[0056] A4 specifically includes:

[0057] A41: For each of the aforementioned time-frequency band carrier signals, the current time-frequency band carrier signal is subjected to a first fractional Fourier transform to obtain the fractional domain amplitude and the first phase, wherein the order of the first fractional Fourier transform of each of the aforementioned time-frequency band 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 adjacent first time period carrier signal, and the adjacent first time period carrier signal is the time period of the current time frequency segment carrier signal that is adjacent to the current time frequency segment carrier signal in the frequency band of the current time frequency segment carrier signal.

[0059] A43: Calculate the current time-frequency band modulation phase signal based on 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 with the same time period as the current time-frequency band carrier signal.

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

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

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

[0063] A6: Amplitude modulation is performed on the second carrier signal according to each of the second data sub-signals to obtain the amplitude modulation 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 the 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 the modulation signal.

[0067] A7 specifically includes:

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

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

[0070] A73: The final phase modulation signal and the final amplitude modulation signal are spliced ​​together to obtain the first modulation signal.

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

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

[0073] This embodiment employs steps A1-A8 as described above, combining short-duration bursts of dolphin ticking signals and long-duration continuous dolphin whistling signals during communication, performing phase modulation and amplitude modulation respectively. Phase modulation is performed in the fractional Fourier domain, dividing the signal into multiple time-frequency bands for processing. The phase difference between adjacent signal bands is used to compensate for phase dispersion, while continuously changing the order of the fractional Fourier transform of each signal band. Furthermore, after modulation, a certain gap is inserted between two adjacent phase-modulated signals or two adjacent amplitude-modulated signals to better mimic the acoustic characteristics of dolphins. This method avoids the problem of reduced correlation coefficients and audio quality perception evaluation values ​​between biomimetic signals and original marine biological acoustic signals caused by traditional phase modulation methods, improving data rate while ensuring the concealment and security of communication.

[0074] To enable those skilled in the art to more clearly understand the specific execution process of the aforementioned high-speed biomimetic underwater acoustic communication method based on fractional Fourier domain modulation, the following combines... Figure 2-6(b) To provide a detailed explanation.

[0075] S1: The transmitting end sends a 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 several segments of the first data sub-signals) and signal x j (n)(j=2,4,6,…,2J)(i.e., the second data signal, which includes several segments of second data sub-signals), for signal x i (n) and signal x j (n) Phase modulation and amplitude modulation are performed respectively. The following explanation uses two data sub-signals, x1(n) and x2(n), as examples. In the phase modulation process, the first carrier signal is the dolphin whistle signal s1(n), and the first data sub-signal is x1(n); in the amplitude modulation process, the second carrier signal is the dolphin click signal s2(n), and the second data sub-signal is x2(n).

[0077] S102: Divide the first carrier signal s1(n) and the first data sub-signal x1(n) into segments in the time domain, and determine the number of time segments M and the duration T of each segment. seg The carrier signals s for M time periods are obtained. 1i (n) and data signal x 1i (n) (n = 1, 2, ..., M) (i.e., the carrier signal and the data sub-signal of the first time segment). In this embodiment, the number of time segments M into which the first carrier signal s1(n) and the first data sub-signal x1(n) are divided is 155, and each carrier signal s1(n) 1i (n) and data signal x 1i The duration T of (n) seg It is 0.001s.

[0078] S103: Convert the carrier signal s of each time period 1i (n) Divide the frequency domain into segments, determine the number of frequency bands N and the boundary frequencies f of each band. j (j=1,2,…,N-1), to obtain the carrier signal s 1_i,j (n)(Instantaneous frequency band carrier signal). In this embodiment, the carrier signal s for each time period is... 1i The frequency bands (n) are divided into 4 frequency bands, and the boundary frequencies of each band are f1 = 6kHz, f2 = 10kHz, and f3 = 14kHz. The time-frequency diagram of the first carrier signal s1(n) is as follows: Figure 3 As 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 on the first data sub-signal x1(n) based on the fractional Fourier domain to obtain the QPSK modulated signal. (i.e., phase-modulated signal). The time-frequency graph is as follows Figure 4 As shown, the first carrier signal s1(n) and the QPSK modulated signal The time-domain waveforms are shown in Figures 5(a) and 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 yields the corresponding fractional domain magnitude A. i,j (u) and phase And calculate the phase difference between signals in adjacent time periods within this frequency band.

[0082]

[0083] (2) Based on the data signal x of the i-th time period 1i Phase of (n) The modulated phase signal is calculated.

[0084]

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

[0086]

[0087] (4) do -p i,j The fractional Fourier transform yields the phase modulator signal.

[0088] (5) Modulate each phase sub-signal By concatenating these components, we obtain the phase modulation signal corresponding to the first data sub-signal x1(n).

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

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

[0091] The expression for the envelope of the dolphin click sound signal 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 carrier signal s2(n) and the amplitude modulation signal... The time-domain waveform is as follows Figure 6(a) and 6(b) As shown.

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

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

[0096] In this embodiment, the purpose of inserting a certain gap is to allow the modulated signal to better mimic the acoustic characteristics of dolphins, further improving the correlation coefficient and PEAQ value between the modulated signal and the original biological acoustic signal, while preventing signal interference during transmission. By precisely controlling the duration of this 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: Final phase modulation signal and the final amplitude modulation signal By splicing them together, the first modulation signal is obtained.

[0098] S109: Modulate the first modulation signal Adding a synchronization header yields the final transmitted signal. The synchronization head used is the dolphin whistle signal.

[0099] The purpose of a synchronization header is to help the receiving end correctly identify and synchronize the start position of the signal when it is received, ensuring the complete and accurate transmission of information.

[0100] S110: Signal It is transmitted into the underwater acoustic channel via a transmitting transducer.

[0101] S2: The receiver receives a signal. And demodulate it.

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

[0103] S202: Remove The blank gaps in the signal are extracted sequentially according to the symbol period length to obtain...

[0104]

[0105] S203: Based on the division method of the sending end, Divided into phase modulation signals and amplitude modulation signal The signal is processed by performing phase demodulation and amplitude demodulation separately to obtain the phase demodulated 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 The concatenation of (n)(j=2,4,6…,2J) yields the final demodulated signal x. c (n).

[0107] Traditional communication modulation methods typically use the time or frequency domain, while this embodiment introduces the fractional Fourier transform (FrFT), a modulation method that lies between the time and frequency domains. By adjusting the order of the FrFT, it is possible to flexibly switch between the time and frequency domains, optimizing signal transmission and providing higher security. The fractional Fourier transform not only enhances signal concealment (by altering the signal's propagation characteristics, making it less detectable by traditional receiving systems), but also effectively increases communication speed while maintaining concealment. This is because it offers more flexible signal representation, avoiding the rate loss caused by the limitations of traditional time or frequency domains.

[0108] During communication, phase changes between adjacent signal segments can cause phase dispersion, affecting the signal decoding effect. 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, it avoids the reduction in concealment caused by phase distortion, while maintaining an efficient phase modulation method and effectively reducing the rate drop caused by signal distortion.

[0109] After modulation, gaps are inserted between adjacent modulated segments to mimic the acoustic characteristics of dolphins. This design not only makes the signal closer to the sound signals of natural marine life, improving its correlation with the original marine acoustic signals, but also avoids spectral congestion to some extent, making signal transmission more stable. The insertion of gaps makes the signal harder to detect when propagating in water, increasing its stealth, and this method does not significantly reduce the data rate; on the contrary, it improves the signal quality and recognizability.

[0110] This embodiment provides a high-speed biomimetic underwater acoustic communication method based on fractional Fourier domain modulation. This method combines short-duration bursts of dolphin ticking signals and long-duration continuous dolphin whistling signals during communication, performing phase modulation and amplitude modulation respectively. In the phase modulation process, phase dispersion caused by phase changes between adjacent signal segments is considered. By dividing the signal into multiple time-frequency segments and processing them, the phase difference between adjacent segments is used to compensate for phase dispersion, thus ensuring the concealment of phase modulation. Furthermore, phase modulation is not performed in the commonly used time or frequency domain, but in the fractional Fourier domain, which lies between the two. The security of phase modulation is ensured by continuously changing the order of the fractional Fourier transform (FrFT) of each signal segment. In addition, after modulation, a certain gap is inserted between adjacent modulated signal segments to better mimic the acoustic characteristics of dolphins, further improving the correlation coefficient and PEAQ value between the modulated signal and the original marine biological acoustic signal. This method can effectively ensure concealment and security while avoiding a reduction in communication rate, thus better solving the contradiction between high concealment and high data rate in previous biomimetic communication methods.

[0111] Example 2

[0112] This embodiment provides a high-speed biomimetic underwater acoustic communication method based on fractional Fourier domain modulation. The main body executing the high-speed biomimetic underwater acoustic communication method based on fractional Fourier domain modulation is the transmitting end, and the high-speed biomimetic underwater acoustic communication method based on fractional Fourier domain modulation includes the following steps:

[0113] A1: Divide 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.

[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 several 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 several time-frequency carrier signals, wherein each of the time-frequency carrier signals refers to each frequency band carrier signal in any of the first time period carrier signals.

[0116] A4: Based on the data sub-signal of the first time period, perform phase modulation on the carrier signal of each time-frequency segment based on the fractional Fourier domain to obtain the phase modulation sub-signal.

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

[0118] A6: Amplitude modulation of the second carrier signal is performed according to each of the second data sub-signals to obtain the amplitude modulated 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 the modulation signal.

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

[0121] This embodiment is based on the same inventive concept as Embodiment 1. The solution to the problem provided in this embodiment is similar to the solution described in Embodiment 1. Therefore, the specific process of the high-speed biomimetic underwater acoustic communication method based on fractional Fourier domain modulation in this embodiment can be found in the limitation in Embodiment 1, and will not be repeated here.

[0122] (1) In this embodiment, the short-term burst dolphin tick signal and the long-term continuous dolphin whistle signal are combined during the communication process, and phase modulation and amplitude modulation are performed respectively, which avoids the problem of the single carrier form in the traditional bionic communication method.

[0123] (2) In this embodiment, 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 FrFT of each signal segment is continuously changed, which effectively ensures the concealment and security of communication, while maintaining a high data rate.

[0124] (3) In this embodiment, by inserting a certain blank gap into the modulated signal, the acoustic characteristics of dolphins can be better imitated, and the correlation coefficient and PEAQ value of the modulated signal and the original marine biological acoustic signal are further improved.

[0125] Example 3

[0126] This embodiment provides a high-speed biomimetic underwater acoustic communication method based on fractional Fourier domain modulation. The executing entity of the high-speed biomimetic underwater acoustic communication method based on fractional Fourier domain modulation is the receiving end, and the high-speed biomimetic underwater acoustic communication method based on fractional Fourier domain modulation includes:

[0127] Demodulate the modulated signal transmitted by the transmitting end, wherein the transmitting end is used for:

[0128] The data signal to be transmitted is divided into two parts to obtain a first data signal and a second data signal. 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.

[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 several first time period carrier signals and first time period data sub-signals;

[0130] Each first time period carrier signal is divided in the frequency domain to obtain several time-frequency segment carrier signals, wherein each time-frequency segment carrier signal refers to each frequency segment carrier signal in any first time period carrier signal;

[0131] Based on the data sub-signal of the first time period, phase modulation is performed on the carrier signal of each time-frequency segment based on the fractional Fourier domain to obtain the phase modulation sub-signal;

[0132] All the phase modulation sub-signals are spliced ​​together to obtain the phase modulation signal corresponding to each of the first data sub-signals;

[0133] The second carrier signal is amplitude modulated according to each second data sub-signal to obtain the amplitude modulated signal corresponding to each second data sub-signal;

[0134] All the phase modulation signals and the amplitude modulation signals are spliced ​​together to obtain the modulation signal.

[0135] This embodiment is based on the same inventive concept as Embodiment 1. The solution to the problem provided in this embodiment is similar to the solution described in Embodiment 1. Therefore, the specific process of the high-speed biomimetic underwater acoustic communication method based on fractional Fourier domain modulation in this embodiment can be found in the limitation in Embodiment 1, and will not be repeated here.

[0136] Example 4

[0137] This embodiment provides a high-speed biomimetic underwater acoustic communication device based on fractional Fourier domain modulation, including: a transmitter and a receiver;

[0138] The transmitting end and the receiving end are connected;

[0139] The sending end is used for:

[0140] The data signal to be transmitted is divided into two parts to obtain a first data signal and a second data signal. 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.

[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 several first time period carrier signals and first time period data sub-signals;

[0142] Each first time period carrier signal is divided in the frequency domain to obtain several time-frequency segment carrier signals, wherein each time-frequency segment carrier signal refers to each frequency segment carrier signal in any first time period carrier signal;

[0143] Based on the data sub-signal of the first time period, phase modulation is performed on the carrier signal of each time-frequency segment based on the fractional Fourier domain to obtain the phase modulation sub-signal;

[0144] All the phase modulation sub-signals are spliced ​​together to obtain the phase modulation signal corresponding to each of the first data sub-signals;

[0145] The second carrier signal is amplitude modulated according to each second data sub-signal to obtain the amplitude modulated signal corresponding to each second data sub-signal;

[0146] All the phase modulation signals and the amplitude modulation signals are concatenated to obtain the modulation signal;

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

[0148] This embodiment is based on the same inventive concept as Embodiment 1. The solution to the problem provided in this embodiment is similar to the solution described in Embodiment 1. Therefore, the specific process of the high-speed biomimetic underwater acoustic communication method based on fractional Fourier domain modulation in this embodiment can be found in the limitation 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, and its internal structure diagram may be as follows. Figure 7 As shown, the computer device includes a processor, memory, input / output (I / O) interfaces, and a communication interface. The processor, memory, and I / O interfaces are connected via a system bus, and the communication interface is also connected to the system bus via the I / O interfaces. The processor provides computational and control capabilities. The memory includes a non-volatile storage medium and internal memory. The non-volatile storage medium stores the operating system, computer programs, and a database. The internal memory provides an environment for the operation of the operating system and computer programs stored in the non-volatile storage medium. The database stores data from the high-speed biomimetic underwater acoustic communication method based on fractional Fourier domain modulation provided in Embodiment 2 or Embodiment 3. The I / O interfaces are used for information exchange between the processor and external devices. The communication interface is used for communication with external terminals via a network connection. When the computer program is executed by the processor, it implements the high-speed biomimetic underwater acoustic communication method based on fractional Fourier domain modulation provided in Embodiment 2 or Embodiment 3.

[0151] Those skilled in the art will understand that Figure 7 The structures shown are merely block diagrams of some structures related to the present application and do not constitute a limitation on the computer device to which the present application is applied. Specific computer devices may include more or fewer components than shown in the figures, or combine certain components, or have different component arrangements. In an exemplary embodiment, a computer device is provided, including a memory and a processor. The memory stores a computer program, and the processor executes the computer program to implement the steps in the above-described method embodiments.

[0152] Example 6

[0153] This embodiment provides a computer-readable storage medium storing a computer program that, when executed by a processor, implements the high-speed biomimetic underwater acoustic communication method based on fractional Fourier domain modulation provided in Embodiment 2 or Embodiment 3 above.

[0154] Example 7

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

[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, data stored, data displayed, 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 the relevant data must comply with relevant regulations.

[0157] Those skilled in the art will understand that all or part of the processes in the methods of the above embodiments can be implemented by a computer program instructing related hardware. The computer program can be stored in a non-volatile computer-readable storage medium, and when executed, it can include the processes of the embodiments of the above methods. Any references to memory, databases, or other media used in the embodiments provided in this 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 can take many forms, such as Static Random Access Memory (SRAM) or Dynamic Random Access Memory (DRAM).

[0158] The databases involved in the embodiments provided in this application may include at least one type of relational database and non-relational database. Non-relational databases may include, but are not limited to, blockchain-based distributed databases. The processors involved in the embodiments provided in this application may be general-purpose processors, central processing units, graphics processing units, digital signal processors, programmable logic devices, quantum computing-based data processing logic devices, etc., and are not limited to these.

[0159] The technical features of the above embodiments can be combined in any way. For the sake of brevity, 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 document uses specific examples to illustrate the principles and implementation methods of this application. The descriptions of the above embodiments are only for the purpose of helping to understand the methods and core ideas of this application. Furthermore, those skilled in the art will recognize that, based on the ideas of this application, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of this application.

Claims

1. A high-speed biomimetic underwater acoustic communication method based on fractional Fourier domain modulation, characterized in that, The high-speed biomimetic underwater acoustic communication method based on fractional Fourier domain modulation is executed by a transmitting end, and includes the following: The data signal to be transmitted is divided into two parts to obtain a first data signal and a second data signal. 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. 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 several first time period carrier signals and first time period data sub-signals; Each first time period carrier signal is divided in the frequency domain to obtain several time-frequency segment carrier signals, wherein each time-frequency segment carrier signal refers to each frequency segment carrier signal in any first time period carrier signal; Based on the data sub-signal of the first time period, phase modulation is performed on the carrier signal of each time-frequency segment based on the fractional Fourier domain to obtain the phase modulation sub-signal; All the phase modulation sub-signals are spliced ​​together to obtain the phase modulation signal corresponding to each of the first data sub-signals; The second carrier signal is amplitude modulated according to each second data sub-signal to obtain the amplitude modulated signal corresponding to each second data sub-signal; All the phase modulation signals and the amplitude modulation signals are concatenated to obtain the modulation signal; The modulated signal is sent to the receiving end, wherein the receiving end is used to demodulate the modulated signal.

2. The high-speed biomimetic underwater acoustic communication method based on fractional Fourier domain modulation according to claim 1, characterized in that, Based on the data sub-signal of the first time period, phase modulation is performed on the carrier signal of each time-frequency band in the fractional Fourier domain to obtain the phase modulation sub-signal, specifically including: For each time-frequency carrier signal, perform a first fractional Fourier transform on the current time-frequency carrier signal to obtain the fractional domain amplitude and the first phase; The phase difference is calculated based on the first phase and the second phase, wherein the second phase is the phase of the adjacent first time period carrier signal, and the adjacent first time period carrier signal is the time period of the current time frequency segment carrier signal that is adjacent to the current time frequency segment carrier signal in the frequency band of the current time frequency segment carrier signal; Based on the phase of the target first time period data sub-signal and the phase difference, the current time-frequency band modulation phase signal is calculated, wherein the target first time period data sub-signal is the first time period data sub-signal with the same time period as the current time-frequency band carrier signal; Based on the fractional domain amplitude and the current time-frequency band modulation phase signal, reconstruct the current time-frequency band fractional domain signal; A second fractional Fourier transform is performed on the current time-frequency fractional domain signal to obtain a phase modulated sub-signal, wherein the order of the first fractional Fourier transform and the order of the second fractional Fourier transform are opposites of each other.

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

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

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

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

7. A high-speed biomimetic underwater acoustic communication method based on fractional Fourier domain modulation, characterized in that, The high-speed biomimetic underwater acoustic communication method based on fractional Fourier domain modulation is executed by a receiving end, and includes the following: Demodulate the modulated signal transmitted by the transmitting end, wherein the transmitting end is used for: The data signal to be transmitted is divided into two parts to obtain a first data signal and a second data signal. 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. 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 several first time period carrier signals and first time period data sub-signals; Each first time period carrier signal is divided in the frequency domain to obtain several time-frequency segment carrier signals, wherein each time-frequency segment carrier signal refers to each frequency segment carrier signal in any first time period carrier signal; Based on the data sub-signal of the first time period, phase modulation is performed on the carrier signal of each time-frequency segment based on the fractional Fourier domain to obtain the phase modulation sub-signal; All the phase modulation sub-signals are spliced ​​together to obtain the phase modulation signal corresponding to each of the first data sub-signals; The second carrier signal is amplitude modulated according to each second data sub-signal to obtain the amplitude modulated signal corresponding to each second data sub-signal; All the phase modulation signals and the amplitude modulation signals are spliced ​​together to obtain the modulation signal.

8. A high-speed biomimetic underwater acoustic communication device based on fractional Fourier domain modulation, characterized in that, The high-speed biomimetic underwater acoustic communication device based on fractional Fourier domain modulation includes: a transmitter and a receiver; The transmitting end and the receiving end are connected; The sending end is used for: The data signal to be transmitted is divided into two parts to obtain a first data signal and a second data signal. 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. 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 several first time period carrier signals and first time period data sub-signals; Each first time period carrier signal is divided in the frequency domain to obtain several time-frequency segment carrier signals, wherein each time-frequency segment carrier signal refers to each frequency segment carrier signal in any first time period carrier signal; Based on the data sub-signal of the first time period, phase modulation is performed on the carrier signal of each time-frequency segment based on the fractional Fourier domain to obtain the phase modulation sub-signal; All the phase modulation sub-signals are spliced ​​together to obtain the phase modulation signal corresponding to each of the first data sub-signals; The second carrier signal is amplitude modulated according to each second data sub-signal to obtain the amplitude modulated signal corresponding to each second data sub-signal; All the phase modulation signals and the amplitude modulation signals are concatenated to obtain the 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, characterized in that the processor executes the computer program to implement the high-speed biomimetic underwater acoustic communication method based on fractional Fourier domain modulation as described in any one of claims 1-6, or the high-speed biomimetic underwater acoustic communication method based on fractional Fourier domain modulation as described in claim 7.

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

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