CN109379161B - A self-adaptation interference system for unmanned aerial vehicle - Google Patents
A self-adaptation interference system for unmanned aerial vehicle Download PDFInfo
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- CN109379161B CN109379161B CN201811525374.XA CN201811525374A CN109379161B CN 109379161 B CN109379161 B CN 109379161B CN 201811525374 A CN201811525374 A CN 201811525374A CN 109379161 B CN109379161 B CN 109379161B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04K—SECRET COMMUNICATION; JAMMING OF COMMUNICATION
- H04K3/00—Jamming of communication; Counter-measures
- H04K3/40—Jamming having variable characteristics
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04K—SECRET COMMUNICATION; JAMMING OF COMMUNICATION
- H04K3/00—Jamming of communication; Counter-measures
- H04K3/40—Jamming having variable characteristics
- H04K3/43—Jamming having variable characteristics characterized by the control of the jamming power, signal-to-noise ratio or geographic coverage area
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04K—SECRET COMMUNICATION; JAMMING OF COMMUNICATION
- H04K3/00—Jamming of communication; Counter-measures
- H04K3/80—Jamming or countermeasure characterized by its function
Abstract
The invention discloses a self-adaptive interference system for an unmanned aerial vehicle.A real-time signal characteristic detector carries out relative power detection and communication system detection on an interfered signal and sends a detection result to an interference signal generator; and the interference signal generator generates an interference signal according to the detection result and sends the interference signal to the interfered signal through the antenna. The system carries out relative power detection and communication system detection on the interfered signal through the real-time signal characteristic detector, and the interference signal generator sends a specific interference signal according to a detection result, so that the specific interference signal can be sent according to the characteristics of the interfered signal, and the interference performance is optimized.
Description
Technical Field
The invention relates to the technical field of interference of unmanned aerial vehicles, in particular to a self-adaptive interference system for an unmanned aerial vehicle.
Background
The existing interference system of the unmanned aerial vehicle generally has three systems:
1. and (4) full-band pressing. The jammer uses white noise to carry out suppression type interference on the frequency band of the required interference all the time, so that a communication system and a GPS (global positioning system) of the unmanned aerial vehicle cannot work normally. The interference unit is simple in design and easy to realize. However, since the bandwidth of the transmitted signal is very wide, the equivalent power required by the jammer is very large, and the power consumption of the jammer is very large.
2. A deceptive disturbance. The interference unit sends a special signal, so that the unmanned aerial vehicle locks or receives a false signal, and the unmanned aerial vehicle cannot work normally. The jammer design is very complex and typically can only spoof special systems that disclose standards, such as GPS. However, due to the particularity of the interference mode, the required equivalent power is low, the power consumption is low, the technical difficulty is high, the specific implementation mode of the interfered system needs to be known, and otherwise, the purpose of interference cannot be achieved. The common communication systems have verification means such as synchronization, pseudo code, frame format and the like, so that the receiver of the opposite party can lock the interference signal instead of the normal signal only by knowing the specific implementation mode of the opposite party. Many communication systems do not disclose their specific implementation and are difficult to spoof, and even if the specific implementation is known, such as GPS, the transmitter itself is much more difficult to implement than the interfering system itself, and the receiver also has many anti-spoofing algorithms to protect.
3. And (4) carrying out frequency hopping type suppression. The signal that the suppression of frequency hopping formula was sent commonly used is the band-limited white noise signal of fixed power, and the jammer uses band-limited white noise to carry out frequency hopping interference, makes unmanned aerial vehicle's communication system and GPS system unable normal work. The frequency points are randomly selected, so that all interference power cannot be concentrated in a frequency band with signals, and energy waste may exist. The relative power required to achieve the same interference effect is reduced compared to full band suppressed interference, depending on the frequency hopping speed and signal bandwidth. The power consumption of the system is intermediate between the former two, but the interference performance of the system depends on the frequency hopping mode of the interfering system and the working standard of the interfered system. Parameters such as frequency hopping rate and frequency hopping bandwidth of frequency hopping interference affect interference performance, and depend on operating systems of interfered systems, such as OFDM, frequency hopping, FSK, and the like.
In summary, the existing interference system for the unmanned aerial vehicle does not care whether a signal exists in an interfered bandwidth or not, does not care about the characteristics of the interfered signal, and interferes only according to a fixed transmission mode, so that the problem that the actual interfered signal is not the best interfering signal due to the interfering signal and the interference performance is not optimal exists.
Disclosure of Invention
The invention aims to provide a self-adaptive interference system for an unmanned aerial vehicle, which can send a specific interference signal according to the characteristics of an interfered signal, so that the interference performance is optimal.
In order to achieve the purpose, the invention provides the following scheme:
an adaptive jamming system for a drone, comprising: the time slot control module comprises a radio frequency signal receiver, a radio frequency signal generator and a switch which are respectively connected with the time slot control module, a real-time signal characteristic detector connected with the radio frequency signal receiver, an interference signal generator connected with the real-time signal characteristic detector and an antenna connected with the switch; the switch is connected between the antenna and the signal input end of the radio-frequency signal receiver and between the antenna and the signal output end of the radio-frequency signal generator, and the signal output end of the interference signal generator is connected with the signal input end of the radio-frequency signal generator;
the time slot control module is used for generating control signals of time slots 0-N and controlling the working time sequence of the radio frequency signal receiver, the radio frequency signal generator and the switch; the antenna is used for receiving wireless radio frequency signals; the switch is used for switching on the radio frequency signal receiver in a time slot 0 and switching on the radio frequency signal generator in time slots 1-N; the radio frequency signal receiver is used for converting the received wireless radio frequency signal into a digital signal and sending the digital signal to the real-time signal characteristic detector; the real-time signal characteristic detector is used for carrying out relative power detection and communication system detection on the digital signal and sending a detection result to the interference signal generator; the interference signal generator is used for generating a digital interference signal according to the detection result and sending the digital interference signal to the radio frequency signal generator; the radio frequency signal generator is used for converting the digital interference signal into a radio frequency signal and sending the radio frequency signal to an interfered signal through the antenna.
Optionally, the time slot control module generates a control signal of time slots 0 to N every period T, and equally divides the period T into the time slots 0 to N, which are N +1 time slots; time slot 0 is a receiving time slot, time slots 1-N are all sending time slots, and each time slot lasts for tau seconds.
Optionally, the real-time signal feature detector performs fast fourier transform on the digital signal in the receiving time slot to obtain spectrum data a (k), where k is 1 to N × m, N is the number of frequency segments, m is the number of points in each frequency segment, and k is a signal serial number output by fast fourier transform, and N × m is total; equally dividing the frequency spectrum into frequency bands 1-N, wherein the bandwidth of each frequency band is B, and the central frequency point is fBnCalculating average power Pn and Pn in the segment as the mean value of the square of the absolute value of a (k) (N), where N is the frequency band number, N is 1-N, k (N) is the signal number still output by fast Fourier transform, k (N) is takenThe value is (n-1) m +1 to n m, the relative power An is calculated from the average power Pn,
optionally, the real-time signal characteristic detector is configured to determine, within the receiving timeslot, whether the digital signal includes a signal characteristic of an FSK/FM narrowband communication, a frequency hopping communication, a spread spectrum communication, a single carrier system or a multi-carrier system, and if so, determine a category of a communication system according to the signal characteristic.
Optionally, when the real-time signal feature detector determines that the type of the communication system is frequency hopping communication or cannot determine the type of the communication system, the interference signal generator generates the digital interference signal by adopting interference mode 1 full-bandwidth pressing interference; when the real-time signal characteristic detector determines that the communication system is in one or more of FSK/FM narrow-band communication, spread spectrum communication, single carrier and multi-carrier systems, the interference signal generator generates the digital interference signal by adopting an interference mode 2 or an interference mode 3.
Optionally, the interference mode 1 includes: performing spectrum adjustment on An interference signal to be transmitted according to the relative power An to match the power spectrum characteristic of the transmitted interference signal with the power spectrum characteristic of a signal received by a receiving time slot, wherein the matching means that the power spectrum characteristic distribution of the transmitted interference signal meets p + A1, p + A2, … and p + An, and then continuously transmitting the interference signal in the transmitting time slots from 1 to N, wherein p is the reference power of a radio frequency signal generator, and A1-An are adjustment quantities; the transmitted interference signal has bandwidth of B × N, length of τ × N seconds, and frequency point of f0And a band-limited white noise signal N of + B (N-1), where N is 1 to N, and N is a total of N signals, and the interference signal is transmitted from the time slot 1 and ends at the time slot N.
Optionally, the interference mode 2 includes: transmitting a center frequency f in a transmission slot 1B1Bandwidth is B, power is p + A1 band-limited white noise, and duration is tau seconds; transmitting a center frequency f in a transmission slot 2B2The bandwidth is B, and the bandwidth is B,band-limited white noise with power p + A2, duration τ seconds, and transmission center frequency f in transmission time slot NBNThe bandwidth is B, the power is p + the bandwidth-limited white noise of AN, the duration is tau seconds, wherein p is the reference power of the radio frequency signal generator, and A1-AN are adjustment quantities.
Optionally, the interference mode 3 includes: dynamically adjusting the time slot ratio of a sending frequency point, setting a threshold value for the relative power value An when the relative power value An is larger, setting the communication transmission signal in the frequency band where the relative power value An is located when the relative power value An is smaller and the time slot ratio is smaller, sending interference signals of corresponding frequency bands in the period T by the aid of circulation of the sending time slots 1-N, and enabling the center frequency of the interference signals correspondingly sent by the frequency band N to be fBnThe bandwidth is B, the power is band-limited white noise of p + An, and the duration is tau seconds, wherein p is the reference power of the radio frequency signal generator, and An is the adjustment quantity; if the relative power value An is smaller than the threshold, no communication transmission signal exists in the frequency band where the relative power value An is located, and no interference signal of the corresponding frequency band is sent.
Optionally, the system operates cyclically according to a period of time slots 0 to N.
Optionally, the radio frequency signal includes an interfered signal and environmental noise.
According to the specific embodiment provided by the invention, the invention discloses the following technical effects: the invention discloses a self-adaptive interference system for an unmanned aerial vehicle, which comprises: the time slot control module comprises a radio frequency signal receiver, a radio frequency signal generator and a switch which are respectively connected with the time slot control module, a real-time signal characteristic detector connected with the radio frequency signal receiver, an interference signal generator connected with the real-time signal characteristic detector and an antenna connected with the switch; the switch is connected between the antenna and the signal input end of the radio-frequency signal receiver and between the antenna and the signal output end of the radio-frequency signal generator, and the signal output end of the interference signal generator is connected with the signal input end of the radio-frequency signal generator; the time slot control module is used for generating control signals of time slots 0-N and controlling the working time sequence of the radio frequency signal receiver, the radio frequency signal generator and the switch; the antenna is used for receiving wireless radio frequency signals; the switch is used for switching on the radio frequency signal receiver in a time slot 0 and switching on the radio frequency signal generator in time slots 1-N; the radio frequency signal receiver is used for converting the received wireless radio frequency signal into a digital signal and sending the digital signal to the real-time signal characteristic detector; the real-time signal characteristic detector is used for carrying out relative power detection and communication system detection on the digital signal and sending a detection result to the interference signal generator; the interference signal generator is used for generating a digital interference signal according to the detection result and sending the digital interference signal to the radio frequency signal generator; the radio frequency signal generator is used for converting the digital interference signal into a radio frequency signal and sending the radio frequency signal to an interfered signal through the antenna. The system carries out relative power detection and communication system detection on the interfered signal through the real-time signal characteristic detector, and the interference signal generator sends a specific interference signal according to a detection result, so that the specific interference signal can be sent according to the characteristics of the interfered signal, and the interference performance is optimized.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without inventive exercise.
Fig. 1 is a block diagram of an embodiment of an adaptive jamming system for an unmanned aerial vehicle according to the present invention;
fig. 2 is a schematic diagram of time slot division in a time slot control module of an embodiment of an adaptive interference system for an unmanned aerial vehicle according to the present invention;
fig. 3 is a schematic diagram of the mid-band division of a real-time signal feature detector for an embodiment of an adaptive jamming system for an unmanned aerial vehicle according to the present invention;
fig. 4 is a schematic diagram of a receiving and transmitting frequency spectrum of an interference mode 1 in an interference signal generator of an embodiment of an adaptive interference system for an unmanned aerial vehicle according to the present invention;
fig. 5 is a schematic diagram of interference mode 2 transceiving spectrum in an interference signal generator according to an embodiment of the adaptive interference system for an unmanned aerial vehicle of the present invention;
fig. 6 is a schematic diagram of interference mode 3 transmit-receive frequency spectrum in an interference signal generator of an embodiment of an adaptive interference system for an unmanned aerial vehicle according to the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention aims to provide a self-adaptive interference system for an unmanned aerial vehicle, which can send a specific interference signal according to the characteristics of an interfered signal, so that the interference performance is optimal.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.
Fig. 1 is a structural diagram of an embodiment of an adaptive jamming system for an unmanned aerial vehicle according to the present invention. Referring to fig. 1, the adaptive jamming system for unmanned aerial vehicle includes:
a time slot control module 101, a radio frequency signal receiver 102, a radio frequency signal generator 103 and a switch 104 (radio frequency switch, device dedicated for radio frequency transceiving) respectively connected to the time slot control module 101, a real-time signal characteristic detector 105 connected to the radio frequency signal receiver 102, the interference signal generator 106 connected to the real-time signal characteristic detector 105, and an antenna 107 connected to the switch 104; the switch 104 is connected between the antenna 107 and the signal input terminal of the rf signal receiver 102, and is connected between the antenna 107 and the signal output terminal of the rf signal generator 103, and the signal output terminal of the interference signal generator 106 is connected to the signal input terminal of the rf signal generator 103.
The time slot control module 101 is configured to generate control signals of time slots 0 to N, and control the working timings of the radio frequency signal receiver 102, the radio frequency signal generator 103, and the switch 104; as shown in fig. 2, the timeslot control module 101 generates control signals of timeslots 0 to N once every period T, and equally divides the period T into timeslots 0 to N, which are N +1 timeslots; time slot 0 is a receiving time slot, time slots 1-N are all sending time slots, and each time slot lasts for tau seconds.
The antenna 107 is configured to receive a radio frequency signal, where the radio frequency signal includes an interfered signal and an environmental noise, and since the interference target of the system is a wireless communication system, the radio frequency signal at the receiving end is a radio frequency signal from the environment, which includes the environmental noise and the interfered signal. Because unmanned aerial vehicle's interference system is interference radio signal, consequently, the reception front end sets up the antenna and is used for receiving radio signal.
The switch 104 is used to switch on the rf signal receiver 102 during time slot 0 and switch on the rf signal generator 103 during time slots 1-N.
The rf signal receiver 102 is configured to convert the received wireless rf signal (including the interfered signal) into a digital signal, and send the digital signal to the real-time signal characteristic detector 105.
The real-time signal characteristic detector 105 is configured to perform relative power detection and communication system detection on the digital signal, and send a detection result to the interference signal generator 106; the interference signal generator 106 is configured to generate a digital interference signal according to the detection result, and send the digital interference signal to the radio frequency signal generator 103; the radio frequency signal generator 103 is configured to convert the digital interference signal into a radio frequency signal, and transmit the radio frequency signal to an interfered signal via the antenna 107.
The real-time signal feature detector 105 performs fast fourier transform on the digital signal in the receiving time slot (time slot 0) to obtain spectrum data a (k), where k is 1 to N × m, where N is the number of frequency segments, m is the number of points in each frequency segment, and k is the serial number of the signal output by fast fourier transform, and N × m is total; equally dividing the frequency spectrum into frequency bands 1-N, wherein the bandwidth of each frequency band is B, and the central frequency point is fBnCalculating average power Pn, Pn in a segment as an average of squares of absolute values of a (k) (N), where N is a frequency band number, N takes values of 1 to N, k (N) is still a signal number output by fast fourier transform, but correlation with the frequency band number is increased, and k (N) takes values of (N-1) × m +1 to N × m, and k (N) × m +1 to N × m is a calculation formula of k, for example: in the frequency band 1, n is 1, k (1) takes values of 1, 2, 3,. and m, in the frequency band 2, n is 2, k (2) takes values of m +1, m +2, m +3,. and 2. m, and so on; calculating a relative power An from the average power Pn,
the relative power An is the spectral characteristics in the time period. The digital signal includes a digital signal of an interfered signal converted by the radio frequency signal receiver 102 from the interfered signal, the digital signal of the interfered signal includes a time domain signal, the time domain signal is subjected to fast fourier transform in the real-time signal characteristic detector 105, a frequency spectrum of the time domain signal is calculated through the fast fourier transform, and thus, spectrum data is obtained, as shown in fig. 3, the frequency spectrum is segmented into a frequency band 1 to a frequency band N, and the frequency spectrum is divided into 6 segments at equal intervals, for example, 840MHz to 900MHz is divided into 6 segments, 840 to 850,850 to 860.
The real-time signal characteristic detector 105 calculates a spectral characteristic (relative power An) once in the reception slot 0 every period T, and tracks the signal change in real time. The real-time signal characteristic detector 105 is used for calculating relative power detection and communication system detection, the spectrum characteristic and the power spectrum characteristic both refer to relative power, except for a fast frequency hopping system, the power spectrum of a general communication system does not change rapidly in a short time (second level) (i.e., the spectrum characteristic does not change in a short time), so that the signal characteristic detected in the time slot 0 can embody the signal characteristics of the time slots 1 to N, and the situation that the signal characteristics of the time slot 0 and the time slots 1 to N are completely different, which causes the interference performance of an interference signal to be reduced or even invalid, is avoided.
The real-time signal feature detector 105 is further configured to determine, in the receiving timeslot (timeslot 0), whether the digital signal includes a signal feature of an FSK/FM narrowband communication, a frequency hopping communication, a spread spectrum communication, a single carrier system or a multi-carrier system according to the digital signal (a time domain signal included in the digital signal of the interfered signal), and if so, determine the category of the communication system according to the signal feature. Since the commonly used communication systems include systems such as narrow-band communication such as FSK/FM, frequency hopping communication, spread spectrum communication, single carrier, and multi-carrier, which have respective signal characteristics, the real-time signal characteristic detector 105 calculates the time-domain signal received by the receiving time slot (time slot 0) by using the existing complex algorithm, determines whether the obtained calculation result includes the signal characteristics of the FSK/FM narrow-band communication, frequency hopping communication, spread spectrum communication, single carrier, or multi-carrier system, and determines the category of the communication system according to the signal characteristics if yes.
When the real-time signal characteristic detector 105 determines that the type of the communication system is frequency hopping communication or cannot determine the type of the communication system, the interference signal generator generates the digital interference signal by adopting interference mode 1 full-bandwidth pressing interference; as shown in fig. 4, the interference pattern 1 includes: performing spectrum adjustment on An interference signal to be transmitted according to the relative power An (signal characteristic), so that the power spectrum characteristic (signal power characteristic) of the transmitted interference signal is matched with the power spectrum characteristic (signal power characteristic) of a signal received by a receiving time slot (time slot 0), wherein the matching means that the power spectrum characteristic distribution of the transmitted interference signal meets p + A1, p + A2, … and p + An, and then continuously transmitting the interference signal in transmitting time slots 1-N, wherein p is the reference power of a radio frequency signal generator (the signal generated by the radio frequency signal generator has a reference power value), and A1-An are adjustment quantities; the interference signal transmitted is of bandwidthB is N, the length is tau N seconds, the frequency point is f0And a band-limited white noise signal N of + B (N-1), where N is 1 to N, and N is a total of N signals, and the interference signal is transmitted from the time slot 1 and ends at the time slot N. The interference mode is a self-adaptive mode of full-bandwidth compression-type interference, a transmitted signal is not white noise any more but is a special signal with fluctuation in power (an adjusted interference signal is not band-limited white noise any more but is an uneven band-limited signal), and signal characteristics are calculated through a receiving time slot (the real-time signal characteristic detection process). The interference mode is more advantageous for the case that a plurality of signals are distributed in a frequency band (the case that a plurality of interfered signals exist in an interfered frequency band), but the power consumption is not reduced basically, and only the interference performance is increased.
When the real-time signal characteristic detector 105 determines that the communication system is classified into one or more of FSK/FM narrow-band communication, spread spectrum communication, single carrier and multi-carrier systems, the interference signal generator generates the digital interference signal by adopting an interference mode 2 or an interference mode 3; the interference mode 2 and the interference mode 3 are both frequency hopping interference modes; as shown in fig. 5, the interference pattern 2 includes: transmitting a center frequency f in a transmission slot 1B1Bandwidth is B, power is p + A1 band-limited white noise, and duration is tau seconds; transmitting a center frequency f in a transmission slot 2B2Bandwidth B, power p + A2, duration τ seconds, and transmission center frequency f in transmission time slot NBNThe bandwidth is B, the power is p + the bandwidth-limited white noise of AN, and the duration is tau seconds, wherein p is the reference power of the radio frequency signal generator (the signal generated by the radio frequency signal generator has a reference power value), and A1-AN are adjustment quantities. The interference mode is a self-adaptive mode of frequency hopping interference, and the interference performance is improved by calculating the transmitted power through a receiving time slot (the real-time signal characteristic detection process). The interference mode is more advantageous for narrow-band communication, equivalent interference power is increased, and power consumption is reduced under the condition of the same interference performance. As shown in fig. 6, the interference pattern 3 includes: dynamically adjusting the time slot ratio of the sending frequency point, no longer 1 time slot corresponding to 1 frequency point, more time slot ratio with large detection power, and detectionThe time slot with small power measurement is smaller in occupied ratio, and more interference is performed on the frequency band in which communication signals possibly exist (the larger the relative power value is, the higher the possibility of the existence of the signals is, and meanwhile, the larger the relative power value is, the larger the interference signal energy required for interfering the frequency band is), so that the interference performance is improved. That is, the larger the relative power value An is, the more the timeslot proportion is, the smaller the relative power value An is, the smaller the timeslot proportion is, by setting a threshold (threshold) for the relative power value An, the relative power value An is greater than the threshold, then there may be communication transmission signals in the frequency band where the relative power value An is located, sending the interference signals of the corresponding frequency band in the cycles T in the time slots 1 to N, where the center frequency of the interference signals sent by the frequency band N is fBnBandwidth is B, band-limited white noise with power p + An, and duration is tau seconds, wherein p is the reference power of the radio frequency signal generator (the signal generated by the radio frequency signal generator has a reference power value), and An is the adjustment quantity; assuming that the relative power values An of the frequency bands 3, 4, k and k +1 are greater than the threshold and the rest frequency bands are less than the threshold, the sending time slots 1-N only send interference signals of 4 frequency points of the frequency bands 3, 4, k and k +1, and the 4 frequency points are sent in turn in a period until the next period is detected again; the frequency band 3 corresponds to the transmitted signal with the center frequency fB3Bandwidth is B, power is p + A3 band-limited white noise, and duration is tau seconds; the center frequency of the signal correspondingly transmitted by the frequency band k is fBkBandwidth B, power p + Ak, and duration τ sec. If the relative power value An is smaller than the threshold, no communication transmission signal exists in the frequency band where the relative power value An is located, and no interference signal of the corresponding frequency band is sent. The interference mode is still a self-adaptive mode of frequency hopping interference, whether communication transmission signals exist in the frequency band or not is judged through the receiving time slot to carry out self-adaptive interference, power consumption can be effectively reduced, and equivalent interference power is improved.
The self-adaptive interference system for the unmanned aerial vehicle circularly works according to the time slot 0-N period, relative power detection and communication system detection are carried out on an interfered signal through a real-time signal characteristic detector, and self-adaptive interference is carried out through an interference signal generator, wherein the communication system detection corresponds to the communication system self-adaptive interference, and the relative power detection corresponds to the frequency spectrum characteristic self-adaptive interference. The power spectrum characteristics, power spectrum distribution, energy distribution, spectrum characteristics and the like all refer to results obtained by relative power detection. The self-adaptive interference means that the signal characteristics in the interfered frequency band are calculated through the receiving time slot 0 to adjust the transmitted interference signal in real time, so as to achieve better interference performance (the interference signal automatically adapts to the signal characteristics in the interfered frequency band). The communication system adaptive interference comprises: and if frequency hopping communication is detected or no communication system is judged, adopting an interference mode 1 full-bandwidth pressing mode interference. The other systems can adopt a frequency hopping interference mode 2 or 3. The spectrum characteristic adaptive interference comprises: a specific signal (interference signal transmitted in the interference method 1/2/3) is transmitted in the transmission slots 1 to N based on the spectral characteristic An (relative power An) calculated in the reception slot 0, and adaptive interference is performed. The system detects the signal characteristic distribution (the power spectrum energy distribution characteristic of the signal) in the frequency band needing to be interfered in a specific time slot (a receiving time slot 0) by detecting the real-time signal characteristic (the power spectrum energy distribution characteristic of the signal), and then sends a self-adaptive interference signal, namely sends a specific interference signal (the interference signal in the interference mode 1/2/3) according to the detected signal characteristic; the interference performance is optimized by receiving the interfered signals in the frequency band, analyzing the characteristics of the interfered signals and then transmitting specific interference signals.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
The principles and embodiments of the present invention have been described herein using specific examples, which are provided only to assist understanding of the system and its core concepts; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In view of the above, the present disclosure should not be construed as limiting the invention.
Claims (10)
1. An adaptive jamming system for a drone, comprising: the time slot control module comprises a radio frequency signal receiver, a radio frequency signal generator and a switch which are respectively connected with the time slot control module, a real-time signal characteristic detector connected with the radio frequency signal receiver, an interference signal generator connected with the real-time signal characteristic detector and an antenna connected with the switch; the switch is connected between the antenna and the signal input end of the radio-frequency signal receiver and between the antenna and the signal output end of the radio-frequency signal generator, and the signal output end of the interference signal generator is connected with the signal input end of the radio-frequency signal generator;
the time slot control module is used for generating control signals of time slots 0-N and controlling the working time sequence of the radio frequency signal receiver, the radio frequency signal generator and the switch; the antenna is used for receiving wireless radio frequency signals; the switch is used for switching on the radio frequency signal receiver in a time slot 0 and switching on the radio frequency signal generator in time slots 1-N; the radio frequency signal receiver is used for converting the received wireless radio frequency signal into a digital signal and sending the digital signal to the real-time signal characteristic detector; the real-time signal characteristic detector is used for carrying out relative power detection and communication system detection on the digital signal and sending a detection result to the interference signal generator; the interference signal generator is used for generating a digital interference signal according to the detection result and sending the digital interference signal to the radio frequency signal generator; the radio frequency signal generator is used for converting the digital interference signal into a radio frequency signal and sending the radio frequency signal to an interfered signal through the antenna; the method comprises the steps of detecting signal characteristic distribution in a frequency band needing to be interfered in a specific time slot by carrying out real-time signal characteristic detection, then sending a self-adaptive interference signal, namely sending a specific interference signal according to the detected signal characteristic, analyzing the characteristic of the interfered signal by receiving the interfered signal in the frequency band, and then sending the specific interference signal, so that the interference performance is optimal.
2. The adaptive interference system for unmanned aerial vehicles according to claim 1, wherein the timeslot control module generates a control signal of timeslots 0-N once every period T, equally divides the period T into timeslots 0-N, for a total of N +1 timeslots; time slot 0 is a receiving time slot, time slots 1-N are all sending time slots, and each time slot lasts for tau seconds.
3. The adaptive interference system for the unmanned aerial vehicle of claim 2, wherein the real-time signal feature detector performs fast fourier transform on the digital signal in the receiving timeslot to obtain spectral data a (k), k takes a value of 1 to M × M, where M is the number of frequency bands, M is the number of points in each frequency band, and k is a signal serial number output by fast fourier transform, and M × M points in total; equally dividing the frequency spectrum into frequency bands 1-M, wherein the bandwidth of each frequency band is B, and the central frequency point is fBnCalculating average power Pn in the segment, Pn is the average value of the square of the absolute value of a (k) (n), wherein n is the frequency range number, n takes the value of 1-M, k (n) is still the signal number output by the fast Fourier transform, k (n) takes the value of (n-1) M + 1-n M, calculating the relative power An according to the average power Pn,
4. the adaptive jamming system for unmanned aerial vehicles according to claim 3, wherein the real-time signal characteristic detector is configured to determine whether the digital signal contains signal characteristics of FSK/FM narrowband communication, frequency hopping communication, spread spectrum communication, single carrier or multi-carrier system in the receiving timeslot according to the digital signal, and if so, determine the category of the communication system according to the signal characteristics.
5. The adaptive interference system for unmanned aerial vehicle of claim 4, wherein when the real-time signal characteristic detector determines that the type of the communication system is frequency hopping communication or cannot determine the type of the communication system, the interference signal generator generates the digital interference signal by interference mode 1 full-bandwidth pressing interference; when the real-time signal characteristic detector determines that the communication system is in one or more of FSK/FM narrow-band communication, spread spectrum communication, single carrier and multi-carrier systems, the interference signal generator generates the digital interference signal by adopting an interference mode 2 or an interference mode 3; the interference mode 2 and the interference mode 3 are both frequency hopping interference modes.
6. The adaptive jamming system for unmanned aerial vehicles according to claim 5, wherein the jamming mode 1 comprises: performing spectrum adjustment on An interference signal to be transmitted according to the relative power An to match the power spectrum characteristic of the transmitted interference signal with the power spectrum characteristic of a signal received by a receiving time slot, wherein the matching means that the power spectrum characteristic distribution of the transmitted interference signal meets p + A1, p + A2, … and p + An, and then continuously transmitting the interference signal in the transmitting time slots from 1 to N, wherein p is the reference power of a radio frequency signal generator, and A1-An are adjustment quantities; the transmitted interference signal has bandwidth of B × N, length of τ × N seconds, and frequency point of f0And a band-limited white noise signal N of + B (N-1), where N is 1 to N, and N is a total of N signals, and the interference signal is transmitted from the time slot 1 and ends at the time slot N.
7. The adaptive jamming system for unmanned aerial vehicles according to claim 5, wherein the jamming mode 2 comprises: transmitting a center frequency f in a transmission slot 1B1Bandwidth is B, power is p + A1 band-limited white noise, and duration is tau seconds; transmitting a center frequency f in a transmission slot 2B2Bandwidth B, power p + A2, duration τ seconds, and transmission center frequency f in transmission time slot NBNThe bandwidth is B, the power is p + the bandwidth-limited white noise of AN, the duration is tau seconds, wherein p is the reference power of the radio frequency signal generator, and A1-AN are adjustment quantities.
8. The adaptive jamming system for unmanned aerial vehicles according to claim 5, wherein the jamming mode 3 comprises: dynamically adjusting the time slot ratio of a sending frequency point, setting a threshold value for the relative power value An when the relative power value An is larger, setting the communication transmission signal in the frequency band where the relative power value An is located when the relative power value An is smaller and the time slot ratio is smaller, sending interference signals of corresponding frequency bands in the period T by the aid of circulation of the sending time slots 1-N, and enabling the center frequency of the interference signals correspondingly sent by the frequency band N to be fBnThe bandwidth is B, the power is band-limited white noise of p + An, and the duration is tau seconds, wherein p is the reference power of the radio frequency signal generator, and An is the adjustment quantity; if the relative power value An is smaller than the threshold, no communication transmission signal exists in the frequency band where the relative power value An is located, and no interference signal of the corresponding frequency band is sent.
9. The adaptive jamming system for unmanned aerial vehicles according to claim 1, wherein the system operates cyclically in time slots 0-N periods.
10. The adaptive jamming system for a drone of claim 1, wherein the wireless radio frequency signal includes a victim signal and ambient noise.
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| CN113075698B (en) * | 2021-03-24 | 2023-07-07 | 重庆大学 | Deception jamming suppression method in satellite navigation receiver |
| CN114189310B (en) * | 2021-12-07 | 2022-06-21 | 中国人民解放军32802部队 | Unmanned aerial vehicle measurement and control signal accurate interference method based on signal reconnaissance and prediction |
| CN114696942B (en) * | 2022-03-25 | 2023-10-10 | 电子科技大学 | Interference method suitable for unmanned aerial vehicle communication link |
| CN115996103B (en) * | 2023-01-09 | 2023-07-21 | 北京羽嘉科技有限责任公司 | Adaptive radio frequency interference system and method for unmanned aerial vehicle frequency hopping communication |
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