CN114268368B - Design method of unmanned aerial vehicle high-capacity chaotic space laser safety emergency communication system - Google Patents
Design method of unmanned aerial vehicle high-capacity chaotic space laser safety emergency communication system Download PDFInfo
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Abstract
The invention relates to a design method of a high-capacity chaotic space laser safety emergency communication system of an unmanned aerial vehicle, and belongs to the technical field of communication. The method comprises the following steps: a laser, an MZM, a photoelectric detector and a delay line form a single-ring photoelectric chaotic generating device which is used for generating chaotic signals; at the transmitting end, the external modulation signal carrying information is coupled with a photoelectric chaos generating device through a coupler, and the information is encrypted; at the receiving end, the encrypted signal is firstly received by using the other coupler and is divided into an upper path and a lower path, and finally, the signals of the two paths are subtracted, so that useful information is recovered; at the transmitting end, n single-ring photoelectric chaotic generating devices are connected in series to form an n-level chaotic signal generating device, and then n external modulation signals are allocated for transmission and encryption; at the receiving end, a chaotic synchronization device is matched with each path of signal to recover the signal, thereby realizing the unmanned aerial vehicle emergency high-capacity secret emergency communication.
Description
Technical Field
The invention belongs to the technical field of communication, relates to the technical field of unmanned aerial vehicle emergency safety communication, and in particular relates to a design method of an unmanned aerial vehicle high-capacity chaotic space laser safety emergency communication system.
Background
Because of the good monochromaticity of laser, free-Space-Optical (FSO) transmission distance is long, so that some scholars are studied and applied to emergency unmanned aerial vehicle communication. However, in emergency situations, most of information of unmanned aerial vehicle communication is secret information, so it is important to encrypt data transmitted between unmanned aerial vehicle laser communication.
The chaos technology has the characteristics of high initial value sensitivity and strong randomness, and becomes a hot research topic of technologies such as network security, image encryption and the like in recent years. However, the application of the chaotic encryption technology to unmanned aerial vehicle emergency laser communication has not been found. Therefore, a method for applying the chaotic encryption technology to unmanned aerial vehicle emergency laser communication and guaranteeing information transmission safety between unmanned aerial vehicles is needed at present. Meanwhile, as more and more devices access the internet, the shortage of bandwidth resources is a critical problem which needs to be solved in the modern communication technology, so that the method also needs to solve the problem of broadband capacity in the unmanned aerial vehicle emergency communication technology.
Disclosure of Invention
In view of the above, the invention aims to provide a design method of a high-capacity chaotic space laser safety emergency communication system of an unmanned aerial vehicle, and physical layer information transmission encryption of chaotic laser communication is carried out by the unmanned aerial vehicle under an emergency condition, so that the emergency high-capacity secret communication of the unmanned aerial vehicle is realized.
In order to achieve the above purpose, the present invention provides the following technical solutions:
a design method of a high-capacity chaotic space laser safety communication system of an unmanned aerial vehicle specifically comprises the following steps:
s1: respectively forming a single-ring photoelectric chaotic generating device by 1 laser, a Mach-Zehnder modulator (MZM), a Photoelectric Detector (PD), a delay line and a first electric amplifier, wherein the photoelectric chaotic generating device is used for generating chaotic signals;
s2: at the transmitting end, coupling an external modulation signal carrying information m (t) with a photoelectric chaos generating device through a coupler, and encrypting the information; at a receiving end, the encrypted signal is firstly received by using the other coupler and is divided into an upper path and a lower path, one path enters a 2 nd photoelectric detector for detection, the chaotic signal+information m (t) is detected, meanwhile, the other path enters a 3 rd photoelectric detector to obtain the chaotic signal+information m (t), the mixed signal is modulated by an MZM to generate a chaotic signal which is the same as the MZM in the photoelectric chaotic generating device at the transmitting end, and the chaotic signal is detected by a 4 th photoelectric detector; finally, subtracting the signals of the 2 nd photoelectric detector and the 4 th photoelectric detector, and recovering useful information m (t) needing encryption;
s3: at the transmitting end, n single-ring photoelectric chaotic generating devices are connected in series to form an n-level chaotic signal generating device, and then n external modulation signals are allocated for transmission and encryption;
s4: at the receiving end, a chaotic synchronization device is matched for each path of signal to recover the signal.
Further, in step S3, at the transmitting end, the encrypted signal formed by the coupler is:
wherein x is 1 (t),x 1 (t),…,x n (t) each represents 1 to n generated chaotic signals and β m1 ,β m2 ,…,β mn Respectively representing the respective amplification factors; m is m 1 (t),m 2 (t),…,m n (t) each represents n signals to be encrypted; and->The high frequency and the low frequency of the nth filter respectively; g n For loop amplification gain, beta mn Is the amplification of the nth information, +.>T 1 ,T 2 ,…,T n To control the delay of chaos of each stage (T n Phase delay of nth stage), phi n Is the corresponding phase relationship.
Further, in step S4, at the receiving end, the signal detected by the upstream is:
wherein y is n (t) is the nth chaotic signal generated by the receiving end, G' n For receiving end amplifying gain, I n (t) is the photodetector sensitivity,
the signals detected by the downlink are:
wherein S is n 、S′ n The detection sensitivity of the photoelectric detector in the nth stage upper path and the lower path is respectively; if synchronization of transmission and reception of chaotic signals is to be achieved, x is required n (t)＝y n (t)；I′ n ＝I n The method comprises the steps of carrying out a first treatment on the surface of the Consider G' n ＝G n ，S′ n ＝S n ，φ′ n ＝φ n The method comprises the steps of carrying out a first treatment on the surface of the Then there is a synchronous equation
The invention has the beneficial effects that: the invention combines the chaos technology and unmanned aerial vehicle communication and is applied to emergency scenes. The invention provides a high-capacity chaotic secret unmanned aerial vehicle emergency laser communication technology, which is characterized in that on the basis of a traditional photoelectric chaotic system, a loop n-level chaotic signal generating device is firstly provided, and then n lasers are used for modulating information outside to match with the n-level chaotic system, so that high-capacity secret transmission is carried out on communication.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention. The objects and other advantages of the invention may be realized and obtained by means of the instrumentalities and combinations particularly pointed out in the specification.
Drawings
For the purpose of making the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in the following preferred detail with reference to the accompanying drawings, in which:
FIG. 1 is a schematic diagram of a typical photoelectric chaotic generating device;
FIG. 2 is a diagram of a transmission and synchronization device based on conventional chaotic information;
fig. 3 is a schematic diagram of an n-way chaotic system serial loop generating device according to the present invention;
FIG. 4 is a diagram of a synchronous transmission and reception structure of the unmanned aerial vehicle emergency chaotic laser high-capacity communication;
fig. 5 is a result of the chaos simulation performed when n=1, wherein fig. 5 (a) is a generated chaos waveform and fig. 5 (b) is an electrical spectrum of the generated waveform;
fig. 6 shows the result of chaos simulation when n=2, wherein fig. 6 (a) shows the generated chaos waveform and fig. 6 (b) shows the corresponding x 1 Spectrum of the generated waveform.
Detailed Description
Other advantages and effects of the present invention will become apparent to those skilled in the art from the following disclosure, which describes the embodiments of the present invention with reference to specific examples. The invention may be practiced or carried out in other embodiments that depart from the specific details, and the details of the present description may be modified or varied from the spirit and scope of the present invention. It should be noted that the illustrations provided in the following embodiments merely illustrate the basic idea of the present invention by way of illustration, and the following embodiments and features in the embodiments may be combined with each other without conflict.
The same or similar reference numbers in the drawings of embodiments of the invention correspond to the same or similar components; in the description of the present invention, it should be understood that, if there are terms such as "upper", "lower", "left", "right", "front", "rear", etc., that indicate an azimuth or a positional relationship based on the azimuth or the positional relationship shown in the drawings, it is only for convenience of describing the present invention and simplifying the description, but not for indicating or suggesting that the referred device or element must have a specific azimuth, be constructed and operated in a specific azimuth, so that the terms describing the positional relationship in the drawings are merely for exemplary illustration and should not be construed as limiting the present invention, and that the specific meaning of the above terms may be understood by those of ordinary skill in the art according to the specific circumstances.
Referring to fig. 1 to 6, the invention designs a design method of a high-capacity chaotic space laser safety emergency communication system of an unmanned aerial vehicle, which specifically comprises the following steps:
step 1: the photoelectric chaos generating structure of the FIG. 1 is composed of a laser, a Mach-Zehnder modulator (MZM), a Photoelectric Detector (PD) and a delay line. Through research of the existing chaotic communication system, the photoelectric chaotic generating system of fig. 1 can be expressed as:
in the formula (1), x (t) is a generated chaotic signal, τ=1/2ρf H ，θ＝1/2πf L (f H And f L High and low frequencies of the filter, respectively), G is the loop gain, T is the delay of the control loop, phi is the resulting phase relationship, and u can be expressed as
Step 2: on the basis of the step 1, n lasers, MZM, PD and delay lines are respectively formed in the form of figure 2. One of the lasers, the MZM, the PD and the delay line form a set of chaotic signal generating and controlling device, and n sets of the chaotic signal generating and controlling devices are connected in series to form an n-level chaotic signal generating device. The advantages of the chaotic signal formed in this way are that: the loop structure is the simplest chaotic signal generation loop structure, and can be matched with n-path laser signal transmission and is the same asThe security of the time chaos is controlled by the n sets of chaos generating systems respectively, and the key of a loop system formed by assuming that the key of one set of system is k n The safety is greatly improved.
S3: as shown in fig. 3, a photoelectric chaos generating device is composed of a loop (composed of a laser 2, an MZM2, a coupler 1, a delay 1, and a detector 1 (PD 1)). When the gain of the electric amplifier reaches a threshold value, the loop generates a dynamic random chaotic signal due to the nonlinear effect of the MZM. The laser emitted by the laser 1 modulates the signal to be transmitted onto the optical field of the laser 1 by means of modulation outside the MZM 1. The optical field carrying information is coupled with the photoelectric chaos generating device in fig. 2 through a coupler 1, and the information is encrypted. At this time, the encryption process of photoelectric chaos is completed at the transmitting end. At the receiving end, the coupler 2 firstly receives the encrypted signal and is divided into an upper path and a lower path, one path enters the detector 2 for detection, the chaotic signal+information m (t) is detected, meanwhile, the other path enters the photoelectric detector 3, the chaotic signal+information m (t) is also obtained, the mixed signal is modulated by the MZM3 again to generate a chaotic signal which is the same as the MZM2, and the chaotic signal is detected by the photoelectric detector 4. Finally, the signals of the photoelectric detector 2 and the photoelectric detector 4 are subtracted, so that the useful information m (t) needing encryption is recovered. The specific theory can be expressed as follows:
the signal passing through the coupler 1 can be expressed as:
beta in formula (3) m ＝πP 1 /2V π Is the amplified magnitude of the information. At the receiving end, the optical information of the uplink is detected by the photodetector 2, which can be expressed as:
the signal of the lower path is delayed, detected, amplified, modulated and re-detected, and the obtained signal can be expressed as:
f m (t)＝S′{GI cos 2 [x(t)+φ]+β m (t)}-SG′I′cos 2 [y(t)+φ′] (5)
here S and S' are detection sensitivity parameters of the photodetectors 2 and 4. If synchronization of the transmitted and received chaotic signals is to be achieved, x (t) =y (t), I '(t) =i (t), considering G' = G, S '=s, phi=phi', there is:
f m (t)＝Sβ m m(t) (6)
s4: in summary, the chaotic signal generating apparatus is extended from a single loop to n stages, and then is equipped with n external modulation signals for transmission and encryption, as shown in the left part of fig. 4. The right side of fig. 4 is a receiving device, and meanwhile, each channel of signal is provided with a chaotic synchronization device to recover the signal. Through the analysis, fig. 4 realizes the simultaneous encrypted transmission of multiple paths of signals among unmanned aerial vehicles, and further realizes the high-capacity secret communication on a trunk.
Examples:
the system is subjected to digital simulation of chaotic signal generation, and a basic chaotic generation system is simulated firstly, namely, only one loop exists (n=1). The specific parameter settings in the formula (1) are shown in table 1, and the result of the simulation of the chaotic system is shown in fig. 5. Fig. 5 (a) is a waveform diagram when n=1, and fig. 5 (b) is a corresponding spectrum diagram when n=1, and it can be seen that the spectrum of the waveform diagram has different frequency components and is uniform, so that the generated signal has high randomness and uncertainty.
Table 1 system parameter settings (n=1)
The number of stages (n) of the loop in the unmanned aerial vehicle emergency chaotic encryption technology provided by the invention can be infinitely expanded. Because of limited computer computing power, the experiment is thatAgain, n=2 was simulated. The parameters are shown in Table 2, and the chaotic signal x is obtained 1 (t) and x 2 The waveform of (t) is shown in FIG. 6 (a). Pass the test, x 1 (t) and x 2 The circuit diagram of (t) is very similar, so that x is chosen 1 (t) calculating an electric spectrum thereof as shown in FIG. 6 (b). As can be seen from fig. 6, the generated chaotic signal has an enhanced effect compared with the above-mentioned case, for example, the speed of the waveform entering the chaotic state is faster, and the spectrogram is more uniform.
Table 2 system parameter settings (n=2)
The following explains the core synchronization technology in detail, and the transmitting and receiving structure diagram is shown in fig. 4: the upper part is two unmanned aerial vehicles, the left side is n-way photoelectric chaotic signal generation and coupling modes, and the right side is a matched receiving device, so that an n-way laser transmission device is formed, n-way information can be simultaneously carried out, and the capacity of an encryption channel is expanded to n times. The specific operation flow is as follows: the transmitting end can be seen to be formed by combining n sets of the chaos generating and transmitting devices. The specific form can be expressed as follows:
here, x 1 (t),…,x n (t) each represents 1 to n generated chaotic signals and β m1 ,…,β mn Respectively representing the respective amplification factors; m is m 1 (t),…,m n (t) respectively represent n signals to be encrypted. From the above description, it can be seen that this architecture is a fusion of fig. 2 and n independent signal transmissions. The specific decryption is the core of the invention, and because the annular chaos generating device of the transmitting end is a dynamic stable process, the signal to be transmitted needs to realize chaos dynamic synchronization between the transmitting end and the receiving end. Therefore, the transmitting device of each path of chaotic signal is matched with the next path of chaotic generating device. In particular, the method comprises the steps of,in the transmitting device and the receiving device in fig. 4, the gain of the amplifier, the characteristic curve of the modulator and the delay are equal, so that the synchronization process of n paths of signals can be realized. Specifically, in fig. 4, the amplifier 1a=1b, and the following 2a=2b, …, na=nb. For the same reason, the characteristic curve of the modulator 1a should be equal to the modulator 1b, 2a=2b, …, na=nb. At the same time, the delays should have a corresponding relationship, and delay 1a=delay 1b, …, na=nb. Only then can the transmitting end and the receiving end realize chaotic synchronization, and the n paths of signals transmitted can be solved. Thus, the high-capacity communication technology of the emergency chaotic laser of the n paths of unmanned aerial vehicles is realized.
Finally, it is noted that the above embodiments are only for illustrating the technical solution of the present invention and not for limiting the same, and although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications and equivalents may be made thereto without departing from the spirit and scope of the present invention, which is intended to be covered by the claims of the present invention.
Claims (1)
1. The design method of the unmanned aerial vehicle high-capacity chaotic space laser safety emergency communication system is characterized by comprising the following steps of:
s1: respectively forming a single-loop photoelectric chaotic generating device by 1 laser, MZM, PD, delay line and a first electric amplifier, wherein the photoelectric chaotic generating device is used for generating chaotic signals; wherein MZM represents Mach-Zehnder modulator, PD represents photodetector;
s2: at the transmitting end, coupling an external modulation signal carrying information m (t) with a photoelectric chaos generating device through a coupler, and encrypting the information; at a receiving end, the encrypted signal is received by using the other coupler and is divided into an upper path and a lower path, one path enters a second photoelectric detector for detection, and the chaotic signal plus the information m (t) is detected; meanwhile, the other path enters a third photoelectric detector to obtain chaotic signal plus information m (t), the mixed signal is modulated by an MZM again to generate a chaotic signal which is the same as the MZM in the photoelectric chaotic generating device at the transmitting end, and the chaotic signal is detected by a fourth photoelectric detector; finally, subtracting the signals of the second photoelectric detector and the fourth photoelectric detector, and recovering useful information m (t) needing encryption;
s3: at the transmitting end, n single-ring photoelectric chaotic generating devices are connected in series to form an n-level chaotic signal generating device, and then n external modulation signals are allocated for transmission and encryption;
in step S3, at the transmitting end, the encrypted signal formed by the coupler is:
wherein x (t) is a chaotic signal generated by each level of modulation, x 1 (t),…,x n (t) each represents 1 to n chaotic signals and β m1 ,…,β mn Respectively representing the respective amplification factors; m is m 1 (t),…,m n (t) each represents n signals to be encrypted; and->The high frequency and the low frequency of the nth filter respectively; g 1 ，G 2 ,…,G n For loop amplification gain, beta m1 ,β m2 ,...,β mn Is an enlargement of the nth information, +.>T 1 ,T 2 ,…,T n To control the time delay of each level of chaos n Is the phase relation of the nth stage loop;
s4: at the receiving end, a chaotic synchronization device is matched for each path of signal, and the signal is recovered;
in step S4, at the receiving end, the signal detected by the uplink is:
wherein y is n (t) is the chaotic signal obtained from the nth stage generated by the receiving end, G n ' is the amplification gain of the receiving end, I (t) is the sensitivity of the photoelectric detector, and the same
The signals detected by the downlink are:
wherein S is n 、S n ' the detection sensitivity of the photoelectric detector in the upper path and the lower path of the nth stage respectively; if synchronization of transmission and reception of chaotic signals is to be achieved, x is required 1 (t)＝y 1 (t),x 2 (t)＝y 2 (t),...,x n (t)＝y n (t)；I 1 ′＝I 1 ,I 2 ′＝I 2 ,...,I n ′＝I n The method comprises the steps of carrying out a first treatment on the surface of the Consider G 1 ′＝G 1 ,G 2 ′＝G 2 ,...,G n ′＝G n ，S 1 ′＝S 1 ,S 2 ′＝S 2 ,...,S n ′＝S n ，φ n ′＝φ n The method comprises the steps of carrying out a first treatment on the surface of the Then there is a synchronous equation
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| DE112020001131T5 (en) * | 2019-03-08 | 2022-01-27 | Osram Gmbh | Component for a lidar sensor system, lidar sensor system, lidar sensor device, method for a lidar sensor system, and method for a lidar sensor device |
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