Encryption transmission method and device of information code, computer equipment and storage medium

Abstract

The invention provides an information code encryption transmission method and device, computer equipment and a storage medium, and the method comprises the steps: combining modulation with amplitude phase modulation, and carrying out the polarization weight factor weighting of a horizontal modulation signal and a vertical modulation signal; performing multi-parameter weighted fractional Fourier transform on the modulated horizontal signal and the modulated vertical signal in a baseband part to obtain a corresponding temporary horizontal signal and a temporary vertical signal; and performing directional processing on the temporary horizontal signal and the temporary vertical signal through a DM algorithm to obtain an encrypted horizontal signal and an encrypted vertical signal, and transmitting the encrypted horizontal signal and the encrypted vertical signal through a dual-polarized antenna. The method has the beneficial effects that the spectrum utilization rate of a communication system and the electromagnetic countermeasure capability in a complex battlefield environment are improved.

Description

Technical Field

[0001] The present invention relates to the field of unmanned aerial vehicles, and particularly to a method, device, computer device, and storage medium for encrypting and transmitting information codes. Background Art

[0002] Satellite communication technology plays a crucial role in multiple fields such as constructing an integrated air, space, ground, and underwater network, low-orbit communication, satellite Internet of Things, satellite navigation, and millimeter wave / Ka / Ku band communication. It particularly demonstrates its unique advantages in the fields of information warfare and unmanned combat. However, during the development of satellite communication, it also faces challenges such as tight spectrum resources and high requirements for carrier synchronization accuracy. Polarization, as the fourth-dimensional characteristic of electromagnetic waves in addition to the time domain, frequency domain, and spatial domain, provides a new dimension for information transmission, enabling the polarization state itself to be used as a carrier of information. However, due to the openness of the satellite communication channel and its wide coverage, the security of polarization information is vulnerable to threats from eavesdroppers. Therefore, it is particularly crucial to enhance the anti-interception ability of satellite communication.

[0003] The anti-interception technologies of satellite communication systems are mainly divided into two categories: traditional encryption technologies and physical layer information security transmission technologies. Traditional encryption technologies focus on encrypting information content and rely on the complexity of algorithms and keys to protect data confidentiality. Physical layer security technologies, on the other hand, focus on processing the waveform, structure, and form of transmitted signals and utilize the characteristics of wireless channels to enhance communication security. Currently, the concealment of signals in complex electromagnetic environments is relatively low, and the robustness of signals in adversarial environments is far from sufficient. Summary of the Invention

[0004] The main objective of the present invention is to provide a method, device, computer device, and storage medium for encrypting and transmitting information codes, aiming to solve the problem of low signal concealment in complex electromagnetic environments.

[0005] The present invention provides a method for encrypting and transmitting information codes, including: Performing serial-to-parallel conversion on the information code to be encrypted to obtain a first data sequence and a second data sequence; Performing amplitude-phase modulation on the first data sequence to obtain a first modulation signal, and modulating the second data sequence by a preset modulation method to obtain a second modulation signal; wherein, the preset modulation method includes polarization modulation and variable polarization modulation; Generating a horizontal signal weight and a vertical signal weight based on the second modulation signal; Multiplying the horizontal signal weight by the first modulation signal to obtain a horizontal modulation signal, and multiplying the vertical signal weight by the second modulation signal to obtain a vertical modulation signal; Preprocess the horizontal modulation signal and the vertical modulation signal respectively to obtain an encrypted horizontal signal and an encrypted vertical signal; Transmit the encrypted horizontal signal and the encrypted vertical signal.

[0006] Further, the step of preprocessing the horizontal modulation signal and the vertical modulation signal respectively to obtain an encrypted horizontal signal and an encrypted vertical signal includes: Perform digital-to-analog conversion on the horizontal modulation signal and the vertical modulation signal respectively to obtain corresponding intermediate horizontal signal and intermediate vertical signal; Perform up-conversion processing on the intermediate horizontal signal and the intermediate vertical signal to obtain the encrypted horizontal signal and the encrypted vertical signal.

[0007] Further, the step of preprocessing the horizontal modulation signal and the vertical modulation signal respectively to obtain an encrypted horizontal signal and an encrypted vertical signal includes: Perform multi-parameter weighted fractional Fourier transform on the horizontal modulation signal and the vertical modulation signal respectively to obtain corresponding temporary horizontal signal and temporary vertical signal; Perform up-directional processing on the temporary horizontal signal and the temporary vertical signal through a preset direction modulation algorithm to obtain the encrypted horizontal signal and the encrypted vertical signal.

[0008] Further, after the step of transmitting the encrypted horizontal signal and the encrypted vertical signal, it further includes: Receive the encrypted horizontal signal and the encrypted vertical signal through a preset receiver; Perform reverse preprocessing on the encrypted horizontal signal and the encrypted vertical signal respectively based on the preprocessing to obtain a target horizontal modulation signal and a target vertical modulation signal; Extract the polarization phase descriptors in the target horizontal modulation signal and the target vertical modulation signal, perform polarization demodulation using the maximum likelihood method to obtain a target first data sequence, remove the polarization information in the target horizontal modulation signal and the target vertical modulation signal through a polarization state matching method, and perform demodulation using a preset APM demodulation method to obtain a target second data sequence; Perform inverse serial-parallel conversion based on the target first data sequence and the target second data sequence to obtain the information code to be encrypted.

[0009] Further, the step of transmitting the encrypted horizontal signal and the encrypted vertical signal includes: Transmit the encrypted horizontal signal and the encrypted vertical signal to a preset dual-polarized antenna to generate corresponding electromagnetic waves; Transmit the electromagnetic wave through the dual-polarized antenna.

[0010] Further, the step of delivering the encrypted horizontal signal and the encrypted vertical signal to a preset dual-polarized antenna to generate corresponding electromagnetic waves includes: Obtain the reference polarization pattern of the interference signal; Based on the reference polarization pattern, deliver the encrypted horizontal signal and the encrypted vertical signal to a preset dual-polarized antenna to generate electromagnetic waves orthogonal to the reference polarization pattern.

[0011] Further, in the step of modulating the second data sequence by a preset modulation method to obtain a second modulation signal, the preset modulation method includes polarization modulation and variable polarization modulation.

[0012] The present invention also provides an encryption transmission device, including: A transformation module, configured to perform serial-to-parallel transformation on the information code to be encrypted to obtain a first data sequence and a second data sequence; A modulation module, configured to perform amplitude-phase modulation on the first data sequence to obtain a first modulation signal, and modulate the second data sequence by a preset modulation method to obtain a second modulation signal; wherein, the preset modulation method includes polarization modulation and variable polarization modulation; A generation module, configured to generate a horizontal signal weight and a vertical signal weight based on the second modulation signal; A calculation module, configured to multiply the horizontal signal weight by the first modulation signal to obtain a horizontal modulation signal, and multiply the vertical signal weight by the second modulation signal to obtain a vertical modulation signal; A preprocessing module, configured to perform preprocessing on the horizontal modulation signal and the vertical modulation signal respectively to obtain an encrypted horizontal signal and an encrypted vertical signal; A transmission module, configured to transmit the encrypted horizontal signal and the encrypted vertical signal.

[0013] The present invention also provides a computer device, including a memory and a processor, where the memory stores a computer program, and when the processor executes the computer program, the steps of the method described in any one of the above are implemented.

[0014] The present invention also provides a computer-readable storage medium, on which a computer program is stored, and when the computer program is executed by a processor, the steps of the method described in any one of the above are implemented.

[0015] Advantages of the present invention: By combining modulation with amplitude-phase modulation, polarization weight factors are weighted for the horizontal modulation signal and the vertical modulation signal; in the baseband part, multi-parameter weighted fractional Fourier transform is performed on the modulated horizontal signal and vertical signal to obtain corresponding temporary horizontal signal and temporary vertical signal; the DM algorithm is used to perform directionality processing on the temporary horizontal signal and the temporary vertical signal to obtain the encrypted horizontal signal and the encrypted vertical signal, improving the spectrum utilization rate of the communication system and the electromagnetic confrontation ability in complex battlefield environments. Description of the Drawings

[0016] Figure 1 is a schematic flowchart of an information code encryption transmission method according to an embodiment of the present invention; Figure 2 is a weight factor mapping diagram of an information code according to an embodiment of the present invention; Figure 3 (a) is a mapping constellation diagram of horizontal polarization in an embodiment of the present invention; Figure 3 (b) is a mapping constellation diagram of vertical polarization in an embodiment of the present invention; Figure 3 (c) is a mapping constellation diagram of 45° linear polarization in an embodiment of the present invention; Figure 3 (d) is a mapping constellation diagram of 135° linear polarization in an embodiment of the present invention; Figure 3 (e) is a mapping constellation diagram of right-handed circular polarization in an embodiment of the present invention; Figure 3 (f) is a mapping constellation diagram of left-handed elliptical polarization in an embodiment of the present invention; Figure 3 (g) is a mapping constellation diagram of right-handed circular polarization in an embodiment of the present invention; Figure 3 (h) is a mapping constellation diagram of left-handed elliptical polarization in an embodiment of the present invention; Figure 4 (a) is an initial constellation diagram of a modulation signal in an embodiment of the present invention; Figure 4 (b) is a constellation diagram of Group (b) parameters of Table 1 of a modulation signal in an embodiment of the present invention; Figure 4 (c) is a constellation diagram of Group (c) parameters of Table 1 of a modulation signal in an embodiment of the present invention; Figure 4 (d) is a constellation diagram of Group (d) parameters of Table 1 of a modulation signal in an embodiment of the present invention; Figure 4(e) is the constellation diagram of a set of parameters in Table 1 of a modulation signal in an embodiment of the present invention; Figure 4 (f) is the constellation diagram of a set of parameters in Table 1 (f) of a modulation signal in an embodiment of the present invention; Figure 4 (g) is the constellation diagram of a set of parameters in Table 1 (g) of a modulation signal in an embodiment of the present invention; Figure 4 (h) is the constellation diagram of a set of parameters in Table 1 (h) of a modulation signal in an embodiment of the present invention; Figure 5 (a) is the initial constellation diagram of a 4PM signal in an embodiment of the present invention; Figure 5 (b) is the constellation diagram of a set of parameters in Table 2 (b) of a modulation signal in an embodiment of the present invention; Figure 5 (c) is the constellation diagram of a set of parameters in Table 2 (c) of a modulation signal in an embodiment of the present invention; Figure 5 (d) is the constellation diagram of a set of parameters in Table 2 (d) of a modulation signal in an embodiment of the present invention; Figure 5 (e) is the constellation diagram of a set of parameters in Table 2 (e) of a modulation signal in an embodiment of the present invention; Figure 5 (f) is the constellation diagram of a set of parameters in Table 2 (f) of a modulation signal in an embodiment of the present invention; Figure 5 (g) is the constellation diagram of a set of parameters in Table 2 (g) of a modulation signal in an embodiment of the present invention; Figure 5 (h) is the constellation diagram of a set of parameters in Table 2 (h) of a modulation signal in an embodiment of the present invention; Figure 6 is the BER curve of the azimuth parameter scan of a PM+DM in an embodiment of the present invention; Figure 7 is the BER curve of the azimuth parameter scan of a QPSK+DM in an embodiment of the present invention; Figure 8 (a) is the initial scan characteristic curve of a 4PM signal in an embodiment of the present invention; Figure 8 (b) is the scan characteristic curve of a set of NV1 parameters in Table 2 (b) of a modulation signal in an embodiment of the present invention; Figure 8 (c) is the scan characteristic curve of a set of NV1 parameters in Table 2 (c) of a modulation signal in an embodiment of the present invention; Figure 8(d) is the scanning characteristic curve of the NV1 parameters of Group (d) of a modulation signal in an embodiment of the present invention; Figure 8 (e) is the scanning characteristic curve of the NV1 parameters of Group (e) of a modulation signal in an embodiment of the present invention; Figure 8 (f) is the scanning characteristic curve of the NV1 parameters of Group (f) of a modulation signal in an embodiment of the present invention; Figure 8 (g) is the scanning characteristic curve of the NV1 parameters of Group (g) of a modulation signal in an embodiment of the present invention; Figure 8 (h) is the scanning characteristic curve of the NV1 parameters of Group (h) of a modulation signal in an embodiment of the present invention; Figure 9 (a) is the initial scanning characteristic curve of a 4PM signal in an embodiment of the present invention; Figure 9 (b) is the scanning characteristic curve of the horizontal and vertical direction parameters of Group (b) of a modulation signal in an embodiment of the present invention; Figure 9 (c) is the scanning characteristic curve of the horizontal and vertical direction parameters of Group (c) of a modulation signal in an embodiment of the present invention; Figure 9 (d) is the scanning characteristic curve of the horizontal and vertical direction parameters of Group (d) of a modulation signal in an embodiment of the present invention; Figure 9 (e) is the scanning characteristic curve of the horizontal and vertical direction parameters of Group (e) of a modulation signal in an embodiment of the present invention; Figure 9 (f) is the scanning characteristic curve of the horizontal and vertical direction parameters of Group (f) of a modulation signal in an embodiment of the present invention; Figure 9 (g) is the scanning characteristic curve of the horizontal and vertical direction parameters of Group (g) of a modulation signal in an embodiment of the present invention; Figure 9 (h) is the scanning characteristic curve of the horizontal and vertical direction parameters of Group (h) of a modulation signal in an embodiment of the present invention; Figure 10 is the bit error rate curve of direction-variable polarization modulation based on parameter scanning in MP-WFRFT in an embodiment of the present invention; Figure 11 is the bit error rate curve of direction-variable polarization modulation based on parameter scanning in MP-WFRFT in an embodiment of the present invention; Figure 12It is a schematic block diagram of a structure of an encrypted transmission device for an information code according to an embodiment of the present invention; Figure 13 It is a schematic block diagram of a structure of a computer device according to an embodiment of the present application.

[0017] The realization of the object of the present invention, functional features and advantages will be further described with reference to the embodiments and the accompanying drawings. Specific Embodiments

[0018] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0019] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative positional relationship and movement conditions between components in a specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indications will also change accordingly. The connections described can be direct connections or indirect connections.

[0020] The term "and / or" in this article is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and B can represent three situations: A exists alone, A and B exist simultaneously, and B exists alone.

[0021] In addition, in the present invention, descriptions such as "first" and "second" are only for descriptive purposes, and cannot be understood as indicating or implying their relative importance or implicitly indicating the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions between various embodiments can be combined with each other, but it must be based on the fact that those of ordinary skill in the art can implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the protection scope required by the present invention.

[0022] Referring to Figure 1 , the present invention proposes an encrypted transmission method for an information code, including: S1: Perform a serial-parallel conversion on the information code to be encrypted to obtain a first data sequence and a second data sequence; S2: Perform amplitude-phase modulation on the first data sequence to obtain a first modulation signal, and perform modulation on the second data sequence through a preset modulation method to obtain a second modulation signal; wherein, the preset modulation method includes polarization modulation and variable polarization modulation; S3: Generate a horizontal signal weight and a vertical signal weight based on the second modulation signal; S4: Multiply the horizontal signal weight by the first modulation signal to obtain a horizontal modulation signal, and multiply the vertical signal weight by the second modulation signal to obtain a vertical modulation signal; S5: Perform preprocessing on the horizontal modulation signal and the vertical modulation signal respectively to obtain an encrypted horizontal signal and an encrypted vertical signal; S6: Transmit the encrypted horizontal signal and the encrypted vertical signal.

[0023] The polarization state of an electromagnetic wave is determined by the relative relationship between the amplitudes and phases of the horizontal and vertical components. Therefore, the Jones vector is introduced to represent the polarization state of a completely polarized electromagnetic wave: where is the amplitude of the electromagnetic wave, and is the phase of the electromagnetic wave , and represent the phases in the vertical and horizontal directions respectively, and the amplitudes in the horizontal and vertical directions are and respectively. The amplitudes can also be expressed in the form of , where , is called the phase descriptor. After normalizing the Jones vector, we get: The definition of the Stokes vector of a completely polarized wave is: where A is the size of the polarization ellipse, is the hypotenuse of the right triangle formed by the major and minor axes of the ellipse, representing the power density of the electromagnetic wave; the size of the elliptic azimuth angle is the angle between the positive direction of the axis and the major axis; the size of the ellipticity angle is the angle between the hypotenuse of the right triangle formed by the major and minor axes and the major axis, represents the geometric descriptor,

[0024] Among the Stokes parameters, represents the radius of the Poincare sphere, , , which correspond to the three coordinates of the polarization state in the Cartesian rectangular coordinate system. Any polarization state can be mapped from , , the three coordinates to a point in the rectangular coordinate system with as the radius.

[0025] As described in step S1 above, the information code to be encrypted is subjected to serial-to-parallel conversion to obtain a first data sequence and a second data sequence. First, the encoded information code stream of the transmitting system is subjected to serial-to-parallel conversion (Serial to Parallel Conversion, S / P) to generate the corresponding first data sequence I p and the second data sequence I q .

[0026] As described in step S2 above, the first data sequence is subjected to amplitude-phase modulation to obtain a first modulation signal, and the second data sequence is modulated by a preset modulation method to obtain a second modulation signal. The preset modulation method can be frequency modulation, phase modulation or other modulation methods.

[0027] As described in step S3 above, based on the second modulation signal, a horizontal signal weight and a vertical signal weight are generated, and the energy distribution of the signal is adjusted by the weights to provide more information for subsequent signal processing.

[0028] As described in step S4 above, the horizontal signal weight is multiplied by the first modulation signal to obtain a horizontal modulation signal, and the vertical signal weight is multiplied by the second modulation signal to obtain a vertical modulation signal. Weight modulation can introduce additional information into the signal, making the signal more difficult to crack.

[0029] As described in step S5 above, the horizontal modulation signal and the vertical modulation signal are respectively preprocessed to obtain an encrypted horizontal signal and an encrypted vertical signal. Among them, the preprocessing can be steps such as encrypting, sampling, and filtering the signal to ensure the privacy and security of the signal during transmission. In a preferred embodiment, the preprocessing is digital-to-analog conversion, frequency conversion, or other processing methods of the signal.

[0030] As described in step S6 above, the encrypted horizontal signal and the encrypted vertical signal are transmitted. That is, the encrypted data is transmitted through the antenna. It can improve the spectrum utilization rate of the communication system and the electromagnetic confrontation ability in complex battlefield environments.

[0031] In one embodiment, step S5 of preprocessing the horizontal modulation signal and the vertical modulation signal respectively to obtain an encrypted horizontal signal and an encrypted vertical signal includes: S501: Perform digital-to-analog conversion on the horizontal modulation signal and the vertical modulation signal respectively to obtain corresponding intermediate horizontal signals and intermediate vertical signals; S502: Perform up-conversion processing on the intermediate horizontal signal and the intermediate vertical signal to obtain the encrypted horizontal signal and the encrypted vertical signal.

[0032] As described in steps S501 - S502 above, first, the encoded information bitstream is subjected to serial-to-parallel conversion (S / P) by the transmitting system. The first data sequence is first subjected to amplitude-phase modulation, and traditional QPSK (Quadrature Phase Shift Keying, QPSK) modulation is used in the PAPM scheme. The second data sequence uses polarization modulation, and the polarization constellation point weight mapping diagram is as Figure 2 shown. Then, the QPSK-modulated signal is divided into two identical signals, which are respectively multiplied by the weight factors 、 , and finally, through digital-to-analog conversion (Digital to Analog Converter, DAC) and up-conversion (Up Conversion, UC), the signal is transmitted. The signals in the vertical and horizontal directions are respectively: where represents the amplitude value of the carrier in the th symbol period, represents the initial phase value of the carrier in the th symbol period. j represents the imaginary part, represents time, and are the electromagnetic wave signal components in the horizontal and vertical directions respectively, represents the carrier phase in the th symbol period.

[0033] In one embodiment, step S5 of preprocessing the horizontal modulation signal and the vertical modulation signal respectively to obtain an encrypted horizontal signal and an encrypted vertical signal includes: S511: Perform multi-parameter weighted fractional Fourier transform on the horizontal modulation signal and the vertical modulation signal respectively to obtain corresponding temporary horizontal signals and temporary vertical signals; S512: Perform up-direction processing on the temporary horizontal signal and the temporary vertical signal through a preset direction modulation algorithm to obtain the encrypted horizontal signal and the encrypted vertical signal.

[0034] As described in the above steps S511 - S512, the principle of the weighted fractional Fourier transform is that the definition formula of MPWFRFT is: Among them, the transformation operator of MPWFRFT is: ; ( =0,1,2,3) is: The th transformation; the scale vector introduced on the basis of the single-parameter weighted fractional Fourier transform is: , where ; is the MPWFRFT signal after transformation. The weighting coefficient is: Among them represents The th DFT transformation weighting coefficient, in particular, here the period is taken.

[0035] The DFT adopts a normalized definition form as: Convert Equation (2.71) into matrix form as: Among them, ( =0,1,2,3) represents The th DFT transformation and The 4-MPWFRFT of

[0036] From (identity matrix) we get: It can be seen that the coefficient matrix is invertible, so 4-MPWFRFT is also invertible. If is known, then the original discrete signal can be obtained through the following formula: The preset direction modulation algorithm is the DM algorithm. Let the number of array elements be , the element spacing d is half of the carrier wavelength, and the azimuth angle is , the excitation vector , and the channel line-of-sight vectors are respectively: Among them, the beamforming vector: , the amplitude: , represents the symbol sent by the transmitter. Then the legitimate receiver receives the signal at the azimuth angle as: Among them represents Gaussian white noise. It can be seen from the received signal of the legitimate receiver that when the azimuth angle of the eavesdropper is not equal to , the eavesdropper cannot demodulate the signal normally.

[0037] Perform multi-parameter weighted fractional Fourier transform on the horizontal modulation signal and the vertical modulation signal respectively to obtain the corresponding temporary horizontal signal and temporary vertical signal; perform up-directional processing on the temporary horizontal signal and the temporary vertical signal through the DM algorithm to obtain the encrypted horizontal signal and the encrypted vertical signal.

[0038] In one embodiment, after step S6 of transmitting the encrypted horizontal signal and the encrypted vertical signal, it further includes: S701: Receive the encrypted horizontal signal and the encrypted vertical signal through a preset receiver; S702: Perform reverse preprocessing on the encrypted horizontal signal and the encrypted vertical signal respectively based on the preprocessing to obtain the target horizontal modulation signal and the target vertical modulation signal; S703: Extract the polarization phase descriptors in the target horizontal modulation signal and the target vertical modulation signal, perform polarization demodulation using the maximum likelihood method to obtain the target first data sequence, remove the polarization information in the target horizontal modulation signal and the target vertical modulation signal through the polarization state matching method, and demodulate using the preset APM demodulation method to obtain the target second data sequence; S704: Perform inverse serial-parallel transformation based on the target first data sequence and the target second data sequence to obtain the information code to be encrypted.

[0039] As described in the above steps S701-S704, the encrypted horizontal signal and the encrypted vertical signal are received by a preset receiving end, wherein the preset receiving end generally refers to a drone. Based on the preprocessing, the encrypted horizontal signal and the encrypted vertical signal are respectively preprocessed inversely to obtain a target horizontal modulation signal and a target vertical modulation signal. Reverse preprocessing is a reverse preprocessing relative to the preprocessing method, aiming to restore the target horizontal modulation signal and the target vertical modulation signal. The polarization phase descriptor in the target horizontal modulation signal and the target vertical modulation signal is extracted, and the target first data sequence is obtained by polarization demodulation using the maximum likelihood method. The polarization information in the target horizontal modulation signal and the target vertical modulation signal is removed by the polarization state matching method, and the preset APM demodulation method is used for demodulation to obtain the target second data sequence. Based on the target first data sequence and the target second data sequence, an inverse serial-to-parallel conversion is performed to obtain the information code to be encrypted.

[0040] In one embodiment, the step S6 of transmitting the encrypted horizontal signal and the encrypted vertical signal comprises: S601: transmitting the encrypted horizontal signal and the encrypted vertical signal to a preset dual-polarization antenna to generate corresponding electromagnetic waves; S602: Transmit the electromagnetic wave through the dual-polarized antenna.

[0041] As described in the above steps S601-S602, the encrypted horizontal signal and the encrypted vertical signal are transmitted to a preset dual-polarization antenna to generate an electromagnetic wave signal that can be transmitted.

[0042] In one embodiment, the step S601 of transmitting the encrypted horizontal signal and the encrypted vertical signal to a preset dual-polarized antenna to generate corresponding electromagnetic waves includes: S6011: Obtain a reference polarization mode of an interference signal; S6012: Transmitting the encrypted horizontal signal and the encrypted vertical signal to a preset dual-polarization antenna based on the reference polarization pattern to generate electromagnetic waves orthogonal to the reference polarization pattern.

[0043] As described in the above steps S6011-S6012, the variable polarization modulation (polarization agility) technology: by adaptively adjusting the polarization state of the transmitted signal, it can intelligently form an orthogonal polarization pattern with the interference signal, effectively avoid interference, and achieve improved anti-interference performance during communication. The variable polarization modulation technology assigns specific digital weight factors to the two orthogonal signals, finely controls their amplitude ratio and phase difference, and then transmits the signal to the dual-polarization antenna to generate electromagnetic waves with arbitrary polarization states. Variable polarization modulation, such as Figure 3 shown.

[0044] In one embodiment, in the step S2 of modulating the second data sequence by a preset modulation method to obtain a second modulated signal, the preset modulation method includes polarization modulation and variable polarization modulation.

[0045] In this embodiment, variable polarization modulation is preferred because variable polarization modulation can be orthogonal to the polarization mode of the interference signal, thereby effectively avoiding interference and improving the anti-interference performance during the communication process.

[0046] The transformation order of MP-WFRFT in QPSK modulated signal is , the scale vector is The parameter values ​​of MP-WFRFT are shown in Table 1.

[0047] Table 1 Parameter list of MP-WFRFT The simulation results are as follows Figure 4 As shown, with the parameters The constellation diagram starts to rotate, diffuse, and compress from the four constellation points of the original signal. The bigger the more obvious ( Figure 4 (b) and (c)). and scale vector and All of them change, and the constellation points begin to split, from the original 4 constellation points to 9 new constellation points ( Figure 4 (d)). and , Further changes, the constellation points are split again into 16 new constellation points ( Figure 4 (e)), which is equivalent to disguising as a 16QAM signal. , , The value of becomes random, and the constellation points begin to overlap, showing a quasi-Gaussian distribution ( Figure 4 (f) Figure 4 (g)). In particular, Figure 4 (h) and Figure 4 (a) has the same distribution of constellation points, but Figure 4 (h) Yes Figure 4 (a) Rotation The result after.

[0048] The transformation order of MP-WFRFT in the horizontal direction in the 4PM signal is , the scale vector is The transformation order in the vertical direction is , the scale vector is The parameter values of MP-WFRFT are shown in Table 2.

[0049] Table 2 Parameter list of MP-WFRFT The simulation results are as Figure 5 shown. As the transform order 、 changes, the distribution of constellation points spreads and gradually aliases ( Figure 5 (b), Figure 5 (c)). After introducing the scale vector, the constellation point distribution tending to a Gaussian distribution is on the entire Poincare sphere ( Figure 5 (d), Figure 5 (e)). In particular, when the transform orders 、 are both 1, the distribution of constellation points becomes the constellation diagram of 2PM ( Figure 5 (f)), but the coordinates of the constellation points are not the standard 2PM, only approaching 2PM wirelessly, which is equivalent to the 2PM signal after adding noise. As 、 and the complexity of the scale vector increase, the distribution of constellation points increasingly tends to a Gaussian distribution ( Figure 5 (g)). Figure 5 (h) has the same constellation point distribution as Figure 5 (a), but Figure 5 (h) is the constellation point distribution diagram of Figure 5 (a) after the constellation points are rotated by .

[0050] Combining the traditional modulation scheme and DM, a comparison is made with the PM+DM scheme. The expected receiving direction is set as , and the range of azimuth scanning is set as - . The simulation comparison diagrams are as Figure 6 and Figure 7 shown. On the premise of the same azimuth parameters, overall, the bit error performance of PM+DM is better than that of QPSK+DM. Locally, near the expected receiving direction, the bit error rate curve of PM+DM is steeper and the curve rises faster. Assume that the transform order in the direction is , the scale vector , . the transform order in the direction is , the scale vector , . The simulation takes VPAPM as the research object and selects the right circular polarization variable polarization modulation method. First, the influence of a single parameter in the scale vector on the scanning characteristics of the VPAPM scheme is studied. Then, under the same parameter scanning interval, the influence of the parameter settings of MP-WFRFT in the horizontal and vertical directions on the bit error performance at the receiving end is explored. As Figure 8 and 9 show, the results indicate that changing the parameters in the horizontal and vertical directions has no impact on the bit error performance of the received signal. has the best bit error performance for the received signal, is the second best, is the worst. The influence of the parameter on the bit error performance at the receiving end is almost the same. The bit error performance curves of , , in the horizontal direction change significantly, while under the same parameter scanning interval, the bit error performance curves of , , in the vertical direction change slightly. It is clarified that compared with the direction, the direction has certain superiority in improving the anti-interception performance of the system. The above two groups of simulations show that the MP-WFRFT algorithm based on the VPAPM modulation scheme has good parameter anti-detection ability. Even under the premise of knowing the variable polarization modulation method, there are still 18 free combinations of parameters to be scanned. If the interceptor is also unknown about the signal transformation method, the demodulation difficulty after intercepting the signal will be quite large.

[0051] Aiming at the shortcomings of the current satellite communication system, such as weak anti-scanning ability, low secrecy rate, and weak anti-cracking ability, this application adopts the MP-WFRFT and DM fusion algorithm based on the VPAPM scheme. The simulation parameter settings are shown in Table 3.

[0052] Table 3 Parameter settings of the fusion algorithm Among them, the azimuth = represents the position of the expected receiver, =0.5 represents the correct transformation order in the horizontal direction at the transmitting end, =0.5 represents the correct transformation order in the vertical direction at the transmitting end. From Figure 10 and Figure 11Analysis shows that: compared with a single secure transmission technology, the combination of MP-WFRFT and DM can significantly improve the anti-interception performance of the system. When the signal-to-noise ratio is greater than 10 dB, the anti-interception performance is increased by approximately at least 10-l order of magnitude, and the larger the signal-to-noise ratio, the more obvious it is, proving the robustness of the system.

[0053] When the azimuth angle in direction modulation is fixed, the transformation order in the horizontal direction ( = 0.50, 0.56, 0.58, 0.60) and the transformation order in the vertical direction ( = 0.50, 0.56, 0.58, 0.60) at the same scanning interval, the parameter change in the horizontal direction significantly improves the bit error performance of the communication system, while the bit error rate curve of the vertical direction e-parameter scanning shows an "aggregation phenomenon", and there is no obvious improvement in the bit error performance of the system. Direction ratio The change of the bit error rate curve in the direction is more significant, demonstrating that the parameter scanning in the direction has certain superiority in improving the anti-interception performance of the system. It can be seen that for the scheme based on VPAPM modulation, when multiple parameters of the MP-WFRFT algorithm change randomly and the deviation degree of the azimuth angle of DM from the ideal direction is large, the impact on the bit error performance will be very significant.

[0054] Referring to Figure 12 , the present invention also provides an encrypted transmission device, including: A transformation module 10 for performing serial-parallel transformation on the information code to be encrypted to obtain a first data sequence and a second data sequence; A modulation module 20 for performing amplitude-phase modulation on the first data sequence to obtain a first modulation signal, and modulating the second data sequence by a preset modulation method to obtain a second modulation signal; wherein, the preset modulation method includes polarization modulation and variable polarization modulation; A generation module 30 for generating a horizontal signal weight and a vertical signal weight based on the second modulation signal; A calculation module 40 for multiplying the horizontal signal weight by the first modulation signal to obtain a horizontal modulation signal, and multiplying the vertical signal weight by the second modulation signal to obtain a vertical modulation signal; A preprocessing module 50 for respectively preprocessing the horizontal modulation signal and the vertical modulation signal to obtain an encrypted horizontal signal and an encrypted vertical signal; A transmission module 60 for transmitting the encrypted horizontal signal and the encrypted vertical signal.

[0055] In one embodiment, the preprocessing module includes: A digital-to-analog conversion sub-module, configured to perform digital-to-analog conversion on the horizontal modulation signal and the vertical modulation signal respectively to obtain corresponding intermediate horizontal signal and intermediate vertical signal; A frequency conversion processing sub-module, configured to perform up-conversion processing on the intermediate horizontal signal and the intermediate vertical signal to obtain the encrypted horizontal signal and the encrypted vertical signal.

[0056] In one embodiment, the preprocessing module includes: A multi-parameter weighted fractional Fourier transform sub-module, configured to perform multi-parameter weighted fractional Fourier transform on the horizontal modulation signal and the vertical modulation signal respectively to obtain corresponding temporary horizontal signal and temporary vertical signal; A directionality processing sub-module, configured to perform directionality processing on the temporary horizontal signal and the temporary vertical signal through a preset DM algorithm to obtain the encrypted horizontal signal and the encrypted vertical signal.

[0057] In one embodiment, the encryption transmission device further includes: A receiving module, configured to receive the encrypted horizontal signal and the encrypted vertical signal through a preset receiving end; An inverse preprocessing module, configured to perform inverse preprocessing on the encrypted horizontal signal and the encrypted vertical signal respectively based on the preprocessing to obtain a target horizontal modulation signal and a target vertical modulation signal; An extraction module, configured to extract polarization phase descriptors from the target horizontal modulation signal and the target vertical modulation signal, perform polarization demodulation using the maximum likelihood method to obtain a target first data sequence, remove polarization information from the target horizontal modulation signal and the target vertical modulation signal through a polarization state matching method, and perform demodulation using a preset APM demodulation method to obtain a target second data sequence; An inverse serial-to-parallel conversion module, configured to perform inverse serial-to-parallel conversion based on the target first data sequence and the target second data sequence to obtain an information code to be encrypted.

[0058] In one embodiment, the transmission module 60 includes: A conveying sub-module, configured to convey the encrypted horizontal signal and the encrypted vertical signal to a preset dual-polarized antenna to generate corresponding electromagnetic waves; A transmission sub-module, configured to transmit the electromagnetic waves through the dual-polarized antenna.

[0059] In one embodiment, the conveying sub-module includes: An acquisition unit, configured to acquire a reference polarization pattern of an interference signal; A transmission unit for transmitting the encrypted horizontal signal and the encrypted vertical signal to a preset dual-polarized antenna based on the reference polarization pattern to generate an electromagnetic wave orthogonal to the reference polarization pattern.

[0060] In one embodiment, the preset modulation method includes polarization modulation and variable polarization modulation.

[0061] Advantages of the present invention: Combining polarization modulation with amplitude-phase modulation, performing polarization weight factor weighting on the horizontal modulation signal and the vertical modulation signal; performing multi-parameter weighted fractional Fourier transform on the modulated horizontal signal and vertical signal in the baseband part to obtain corresponding temporary horizontal signal and temporary vertical signal; performing directivity processing on the temporary horizontal signal and the temporary vertical signal through the DM algorithm to obtain the encrypted horizontal signal and the encrypted vertical signal, improving the spectrum utilization rate of the communication system and the electromagnetic confrontation ability in complex battlefield environments.

[0062] Referring to Figure 13 , an embodiment of the present application further provides a computer device, which may be a server, and its internal structure may be as Figure 13 shown. The computer device includes a processor, a memory, a network interface, and a database connected through a system bus. Among them, the processor of the computer design 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 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 various signals, etc. The network 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, it can implement the encrypted transmission method of the information code described in any of the above embodiments.

[0063] Those skilled in the art can understand that Figure 13 the structure shown in

[0064] 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.

[0065] Those of ordinary skill in the art can understand that all or part of the processes of implementing the methods in the above embodiments can be completed by instructing relevant hardware through a computer program. 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 methods. Among them, any reference to a memory, storage, database, or other medium provided in this application and used in the embodiments can include non-volatile and / or volatile memories. Non-volatile memory can include read-only memory (ROM), programmable ROM (PROM), electrically programmable ROM (EPROM), electrically erasable programmable ROM (EEPROM), or flash memory. Volatile memory can include random access memory (RAM) or external cache memory. By way of illustration and not limitation, there are various forms of RAM, such as static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), enhanced SDRAM (ESDRAM), synchronous link (Synchlink) DRAM (SLDRAM), Rambus direct RAM (RDRAM), direct memory bus dynamic RAM (DRDRAM), and Rambus dynamic RAM (RDRAM), etc.

[0066] It should be noted that in this article, the term "including", "comprising", or any other variant thereof is intended to cover non-exclusive inclusion, such that a process, apparatus, article, or method including a series of elements not only includes those elements but also includes other elements not expressly listed, or also includes elements inherent to such process, apparatus, article, or method. Without further limitation, an element defined by the statement "including a..." does not exclude the existence of additional identical elements in the process, apparatus, article, or method including that element.

[0067] The embodiments of this application can acquire and process relevant data based on artificial intelligence technology. Among them, artificial intelligence (AI) is the theory, method, technology, and application system that uses a digital computer or a machine controlled by a digital computer to simulate, extend, and expand human intelligence, perceive the environment, acquire knowledge, and use knowledge to obtain the best results.

[0068] Artificial intelligence basic technologies generally include technologies such as sensors, dedicated artificial intelligence chips, cloud computing, distributed storage, big data processing technology, operation / interaction systems, and mechatronics. Artificial intelligence software technologies mainly include several major directions such as computer vision technology, robotics, biometric technology, speech processing technology, natural language processing technology, and machine learning / deep learning.

[0069] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the scope of the claims of the present invention.

Claims

1. A method for encrypting and transmitting information codes, characterized in that: include: Performing serial-to-parallel conversion on the information code to be encrypted to obtain a first data sequence and a second data sequence; Performing amplitude-phase modulation on the first data sequence to obtain a first modulated signal, and modulating the second data sequence by a preset modulation method to obtain a second modulated signal; wherein the preset modulation method includes polarization modulation and variable polarization modulation; wherein the preset modulation method includes polarization modulation and variable polarization modulation; generating a horizontal signal weight and a vertical signal weight based on the second modulated signal; Multiplying the horizontal signal weight by the first modulation signal to obtain a horizontal modulation signal, and multiplying the vertical signal weight by the second modulation signal to obtain a vertical modulation signal; Preprocessing the horizontal modulation signal and the vertical modulation signal respectively to obtain an encrypted horizontal signal and an encrypted vertical signal; The encrypted horizontal signal and the encrypted vertical signal are transmitted.

2. The method for encrypting and transmitting information codes as claimed in claim 1, characterized in that: The step of preprocessing the horizontal modulation signal and the vertical modulation signal respectively to obtain an encrypted horizontal signal and an encrypted vertical signal comprises: Performing digital-to-analog conversion on the horizontal modulation signal and the vertical modulation signal respectively to obtain corresponding intermediate horizontal signals and intermediate vertical signals; The intermediate horizontal signal and the intermediate vertical signal are subjected to up-conversion processing to obtain the encrypted horizontal signal and the encrypted vertical signal.

3. The method for encrypting and transmitting information codes as claimed in claim 1, characterized in that: The step of preprocessing the horizontal modulation signal and the vertical modulation signal respectively to obtain an encrypted horizontal signal and an encrypted vertical signal comprises: Performing multi-parameter weighted fractional Fourier transform on the horizontal modulation signal and the vertical modulation signal respectively to obtain corresponding temporary horizontal signal and temporary vertical signal; The temporary horizontal signal and the temporary vertical signal are directionally processed by a preset directional modulation algorithm to obtain the encrypted horizontal signal and the encrypted vertical signal.

4. The method for encrypting and transmitting information codes as claimed in claim 1, characterized in that: After the step of transmitting the encrypted horizontal signal and the encrypted vertical signal, the method further includes: Receiving the encrypted horizontal signal and the encrypted vertical signal through a preset receiving end; Based on the preprocessing, the encrypted horizontal signal and the encrypted vertical signal are respectively subjected to inverse preprocessing to obtain a target horizontal modulation signal and a target vertical modulation signal; Extracting polarization phase descriptors from the target horizontal modulation signal and the target vertical modulation signal, using maximum likelihood method polarization demodulation to obtain a target first data sequence, removing polarization information from the target horizontal modulation signal and the target vertical modulation signal by a polarization state matching method, and demodulating using a preset APM demodulation method to obtain a target second data sequence; An inverse serial-to-parallel conversion is performed based on the target first data sequence and the target second data sequence to obtain an information code to be encrypted.

5. The method for encrypting and transmitting information codes as claimed in claim 1, characterized in that: The step of transmitting the encrypted horizontal signal and the encrypted vertical signal comprises: Transmitting the encrypted horizontal signal and the encrypted vertical signal to a preset dual-polarized antenna to generate corresponding electromagnetic waves; The electromagnetic waves are transmitted through the dual-polarized antenna.

6. The method for encrypting and transmitting information codes as claimed in claim 1, characterized in that: The step of transmitting the encrypted horizontal signal and the encrypted vertical signal to a preset dual-polarized antenna to generate corresponding electromagnetic waves includes: Obtaining a reference polarization pattern of an interference signal; The encrypted horizontal signal and the encrypted vertical signal are transmitted to a preset dual-polarization antenna based on the reference polarization pattern to generate electromagnetic waves orthogonal to the reference polarization pattern.

7. An encrypted transmission device, characterized in that: include: A conversion module, used for performing serial-to-parallel conversion on the information code to be encrypted to obtain a first data sequence and a second data sequence; A modulation module, configured to perform amplitude-phase modulation on the first data sequence to obtain a first modulation signal, and to modulate the second data sequence by a preset modulation method to obtain a second modulation signal; wherein the preset modulation method includes polarization modulation and variable polarization modulation; wherein the preset modulation method includes polarization modulation and variable polarization modulation; A generating module, configured to generate a horizontal signal weight and a vertical signal weight based on the second modulated signal; a calculation module, configured to multiply the horizontal signal weight by the first modulation signal to obtain a horizontal modulation signal, and to multiply the vertical signal weight by the second modulation signal to obtain a vertical modulation signal; A preprocessing module, used to preprocess the horizontal modulation signal and the vertical modulation signal respectively to obtain an encrypted horizontal signal and an encrypted vertical signal; The transmission module is used to transmit the encrypted horizontal signal and the encrypted vertical signal.

8. A computer device comprising a memory and a processor, wherein the memory stores a computer program, wherein: When the processor executes the computer program, the steps of the method according to any one of claims 1 to 6 are implemented.

9. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the steps of the method according to any one of claims 1 to 6 are implemented.

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