WO2020119726A1 - System and method for detecting photographing of unmanned aerial vehicle - Google Patents

Abstract

Disclosed is a system for detecting photographing of an unmanned aerial vehicle, the system comprising a controllable flash module, an unmanned aerial vehicle signal detection and recognition module and an unmanned aerial vehicle signal processing module, wherein the controllable flash module can start a flickering light source after monitoring the brightness of a target area. By means of unmanned aerial vehicle video compression, i.e. the principle of performing compression by means of inter-frame and intra-frame compression and comparing the differences between images and in the images, and by using a method where an array light source flickers, when an unmanned aerial vehicle photographs the flickering of the array light source, the differences between two frames of image and in the same frame of image increase rapidly, causing a bit rate of an image transmission signal of the unmanned aerial vehicle to increase; therefore, whether the unmanned aerial vehicle is performing photographing can be determined by comparing the magnitude of the bit rate of the image transmission signal of the unmanned aerial vehicle before a controllable flash module is started and the magnitude of the bit rate of the image transmission signal of the unmanned aerial vehicle after the controllable flash module is started. Whether an unmanned aerial vehicle is performing photographing can be determined without deciphering an encrypted image transmission signal of the unmanned aerial vehicle, thereby achieving the advantages of high efficiency and low costs.

Description

System and method for detecting drone shooting Technical field

The invention relates to the technical field of anti-drones, in particular to a system and method for detecting drone shooting.

Background technique

At present, with the rapid development of multi-rotor drones, small civilian drones have become more and more popular, and drones are widely used in many fields such as industry, military, and civil. At the same time, the widespread application of drones has also brought security and privacy issues. The "black fly" incidents of drones have occurred frequently at home and abroad, seriously endangering personal privacy, public places, aviation safety and national security. In order to cope with the challenges posed by the frequent "black flying" of drones to individuals and public safety, timely and effective detection of drones in specific airspace is urgently needed.

Existing technical means such as radar, radio and image processing can only identify and locate the drone, and the danger of the drone is to use the camera to shoot, which brings privacy leakage. Since the UAV communication uses encryption technology, the existing technical means cannot directly obtain the UAV shooting content from the communication signal, and it cannot effectively determine which targets the UAV is shooting.

Summary of the invention

In view of the shortcomings of the prior art, the present invention aims to provide a high-efficiency and low-cost method to judge whether the drone is shooting the target area by adding a flicker light source and analyzing the bit rate of the UAV image transmission signal under the flicker light source The detection system and method of UAV shooting.

In order to achieve the above objectives, the present invention adopts the following technical solutions:

An unmanned aerial vehicle shooting system includes a controllable flash module, an unmanned aerial vehicle signal detection and identification module, an unmanned aerial vehicle signal processing module, and an alarm. Signal processing module communication connection, used to collect radio signals outside the target area and identify whether the UAV image transmission signal, if recognized as UAV image transmission signal, transmit the signal to the UAV signal processing module and start the controllable flash module ; A controllable flash module is set around the target area. The controllable flash module is used to control the turning on of the flashing light source after detecting the brightness around the target area. The UAV signal processing module is used to compare the controllable flash module before starting and controllable. After the flash module is activated, the UAV image transmission signal bit rate is used to determine whether the UAV is shooting; the alarm is connected to the UAV signal processing module for communication, which is used to determine the UAV in the UAV signal processing module. An alarm is issued when the target area is photographed.

Further, the controllable flash module includes an array light source, a brightness detector, and a light source controller. An array light source is provided around the target area. The light source controller is in communication with the array light source and the UAV signal detection and identification module, respectively. The UAV signal detection and recognition module recognizes the UAV image transmission signal and activates the array light source to control the array light source blinking pattern. The brightness detector is used to detect the brightness of the target area before the array light source is turned on.

In particular, the array light source can be arranged on the surface of a house window, car, etc. The light source of the array light source has the characteristics of adjustable brightness and fast lighting. The light source controller can control the activation of the array light source, the number of light sources and the light source interval.

Still further, the UAV signal detection and recognition module includes a signal collector, a signal classifier, a signal feature database, and a signal identifier. The signal collector is used to collect radio signals around the target area and transmit them to the signal classifier and identify the signals. When the UAV determines the signal transmitted by the UAV, the signal is transmitted to the UAV signal processing module; the signal classifier is used to extract the signal characteristics of the radio signal and complete the feature classification and transmit it to the signal recognizer; the signal feature database is used to store the current Some UAV image transmission signal characteristics; the signal recognizer is used to compare the classified signal characteristics with the existing UAV image transmission signal characteristics of the signal characteristics database and identify whether the signal is a UAV image transmission signal. It is the UAV image transmission signal to start the controllable flash module.

Furthermore, the UAV signal detection and recognition module further includes a signal storage, and the signal storage is in communication with the signal recognizer for storing the UAV image transmission signal after it is recognized.

Further, the UAV signal processing module includes a signal bit counter and a signal bit rate comparator, the signal bit counter is used to calculate the light source of the controllable flash module transmitted from the UAV signal detection and identification module The bit rate of the UAV image transmission signal after the light source of the controlled flash module is turned on and transmitted to the signal bit rate comparator; the signal bit rate comparator is used to compare the light source of the controllable flash module before and after the light source of the controllable flash module is turned on The signal bit rate is used to judge whether the drone is shooting the target area. The communication connection between the alarm and the signal bit rate comparator is used to issue an alarm when the drone is shooting the target area.

The working method of detecting drone shooting system includes the following steps:

S1 Place the controllable flash module around the target area, and turn on the UAV signal detection and identification module and the UAV signal processing module;

S2 The signal collector detects and collects the radio signals around the target area, and transmits the radio signals to the signal classifier for signal feature extraction and classification. The signal recognizer uses the classified signal features and the existing unattended in the signal feature database. Compare the characteristics of the image transmission signal to identify whether the signal is a UAV image transmission signal;

S3 If the signal recognizer recognizes the UAV image transmission signal, the brightness detector starts to monitor the natural brightness around the target area when the array light source is not turned on, and the signal collector transmits the UAV image transmission signal to the signal bit counter, Obtain the signal bit rate at this time and transmit it to the signal bit rate comparator;

S4 The light source controller activates the array light source and causes the array light source to flash repeatedly according to the coding sequence;

S5 The signal collector collects the UAV image transmission signal around the target area when the array light source is turned on after the array light source is turned on, and transmits it to the signal bit counter to obtain the UAV image transmission after the array light source is turned on The bit rate of the signal, the signal bit rate comparator compares the bit rate of the UAV image transmission signal after the array light source is started and before the array light source is started in step S3. When the bit rate is higher than the bit rate of the UAV image transmission signal when the light source of the array light source is off, it can be judged that the drone is shooting the target area

S6 When the signal bit rate comparator determines that a drone is shooting the target area, the alarm starts to issue an alarm.

It should be added that the coding sequence in step S4 is determined by the light source controller controlling the number of light sources in the array light source, the light source on time and the light off time.

It should be further added that in step S3, the brightness detector starts to monitor the natural brightness around the target area when the array light source is not turned on, and the signal bit counter obtains the bit rate of the UAV image transmission signal under the natural brightness.

It needs to be further explained that, in the step S3, if the signal recognizer detects the UAV image transmission signal, the signal storage stores the UAV image transmission signal.

The beneficial technical effects of the present invention:

1. The present invention uses the principle of UAV video compression by compressing between frames and within frames, comparing the differences between images and within images, and adopts the method of array light source flashing. When the UAV photographs the array light source flashing, The difference between the two-frame image and the same frame image will increase sharply, resulting in poor compression effect, increased video transmission data, and the UAV image transmission signal bit rate will increase accordingly. After the image transmission signal, the UAV signal processing module can determine whether the UAV is shooting by comparing the bit rate of the UAV image transmission signal before the array light source is started and after the array light source is started. You can judge whether the drone is shooting without cracking the encrypted signal of the UAV image transmission, which has the advantages of high efficiency and low cost.

2. In the present invention, by deploying array light sources at different angles around the target area, it is beneficial to detect whether the drone is shooting the target area in all directions and all weathers.

BRIEF DESCRIPTION

Figure 1 is a flowchart of the present invention;

2 is a structural diagram of the present invention;

Figure 3 is a working flowchart of the UAV signal detection and identification module;

Figure 4 is a flowchart of analyzing the bit rate of UAV video transmission signals;

Figure 5 is a flowchart of the optimal code matching algorithm for array light sources.

detailed description

The present invention will be further described below with reference to the drawings. It should be noted that the following examples are based on the technical solution and provide detailed implementations and specific operation procedures, but the scope of protection of the present invention is not limited to this. Examples.

A detection drone shooting system, as shown in FIG. 2, a detection drone shooting system includes a controllable flash module, a drone signal detection and identification module, a drone signal processing module and an alarm, unmanned The machine signal detection and identification module is respectively connected to the controllable flash module and the UAV signal processing module to collect radio signals outside the target area and identify whether the UAV image transmission signal. The signal is transmitted to the UAV signal processing module and the controllable flash module is activated; the controllable flash module is set around the target area. The controllable flash module is used to detect the brightness around the target area and control the turning on of the flashing light source. The signal processing module is used to compare the bit rate of the UAV image transmission signal before the controllable flash module is started and after the controllable flash module is started to determine whether the drone is shooting; the alarm is connected to the drone signal processing module , Used to issue an alarm when the UAV signal processing module determines that the UAV is shooting the target area.

Further, the controllable flash module includes an array light source, a brightness detector, and a light source controller. An array light source is provided around the target area. The light source controller is in communication with the array light source and the UAV signal detection and identification module, respectively. The UAV signal detection and recognition module recognizes the UAV image transmission signal and activates the array light source to control the array light source blinking pattern. The brightness detector is used to detect the brightness of the target area before the array light source is turned on.

In particular, the array light source can be arranged on the surface of a house window, car, etc. The light source of the array light source has the characteristics of adjustable brightness and fast lighting. The light source controller can control the activation of the array light source, the number of light sources and the light source interval.

Still further, the UAV signal detection and recognition module includes a signal collector, a signal classifier, a signal feature database, and a signal identifier. The signal collector is used to collect radio signals around the target area and transmit them to the signal classifier and identify the signals. When the UAV determines the signal transmitted by the UAV, the signal is transmitted to the UAV signal processing module; the signal classifier is used to extract the signal characteristics of the radio signal and complete the feature classification and transmit it to the signal recognizer; the signal feature database is used to store the current Some UAV image transmission signal characteristics; the signal recognizer is used to compare the classified signal characteristics with the existing UAV image transmission signal characteristics of the signal characteristics database and identify whether the signal is a UAV image transmission signal. It is the UAV image transmission signal to start the controllable flash module.

Furthermore, the UAV signal detection and identification module further includes a signal storage, and the signal storage is in communication connection with the signal identification, and is used to store the UAV image transmission signal after the signal identification recognizes it.

Further, the UAV signal processing module includes a signal bit counter and a signal bit rate comparator, the signal bit counter is used to calculate the light source of the controllable flash module transmitted from the UAV signal detection and identification module The bit rate of the UAV image transmission signal after the light source of the controlled flash module is turned on and transmitted to the signal bit rate comparator; the signal bit rate comparator is used to compare the light source of the controllable flash module before and after the light source of the controllable flash module is turned on The signal bit rate is used to judge whether the drone is shooting the target area. The communication connection between the alarm and the signal bit rate comparator is used to issue an alarm when the drone is shooting the target area.

As shown in FIG. 3, the signal collector is used to collect radio signals around the target area and transmit them to the signal classifier. The signal classifier extracts and classifies the signal characteristics of the signal. The signal recognizer uses the classified signal characteristics and The existing UAV image transmission signals in the signal characteristic database are compared to identify whether the radio signal is an UAV image transmission signal. If it is not the UAV image transmission signal, the signal collector continues to collect the radio signal. If it is the UAV image transmission signal, the signal storage stores the UAV image transmission signal, and the signal collector transmits the UAV image transmission signal Transfer to the signal bit counter, and then the array light source starts.

As shown in Figure 4, when the signal recognizer recognizes the UAV image transmission signal, the signal collector transmits the UAV image transmission signal to the signal bit counter, obtains the bit rate of the UAV image transmission signal and transmits it to The signal bit rate comparator, and then the light source controller starts the array light source. At this time, the signal collector continues to transmit the UAV image transmission signal around the target area to the signal bit counter, and the UAV image transmission signal is obtained when the array light source is activated The signal bit rate is transmitted to the signal bit rate comparator. The signal bit rate comparator compares the signal bit rate of the UAV image transmission signal before the array light source is activated and the signal bit rate of the UAV image transmission signal after the array light source is activated. If the former has a larger signal bit rate, the signal collector continues to collect radio signals in the target area; if the latter has a higher signal bit rate, it can be determined that the drone is shooting the target area, and the alarm starts to issue Siren.

As shown in Figure 1, the working method of detecting the drone shooting system includes the following steps:

S1 Place the controllable flash module around the target area, and turn on the UAV signal detection and identification module and the UAV signal processing module;

S2 The signal collector detects and collects the radio signals around the target area, and transmits the radio signals to the signal classifier for signal feature extraction and classification. The signal recognizer uses the classified signal features and the existing unattended in the signal feature database. Compare the characteristics of the image transmission signal to identify whether the signal is a UAV image transmission signal;

S3 If the signal recognizer recognizes the UAV image transmission signal, the brightness detector starts to monitor the natural brightness around the target area when the array light source is not turned on, and the signal collector transmits the UAV image transmission signal to the signal bit counter, Obtain the signal bit rate at this time and transmit it to the signal bit rate comparator;

S4 The light source controller activates the array light source and causes the array light source to flash repeatedly according to the coding sequence;

S5 The signal collector collects the UAV image transmission signal around the target area when the array light source is turned on after the array light source is turned on, and transmits it to the signal bit counter to obtain the UAV image transmission after the array light source is turned on The bit rate of the signal, the signal bit rate comparator compares the bit rate of the UAV image transmission signal after the array light source is started and before the array light source is started in step S3. When the bit rate is higher than the bit rate of the UAV image transmission signal when the light source of the array light source is off, it can be judged that the drone is shooting the target area

S6 When the signal bit rate comparator determines that a drone is shooting the target area, the alarm starts to issue an alarm.

It should be added that the coding sequence in the step S4 is determined by the light source controller controlling the number of light sources in the array light source, the light-on time and the light-off time of the light source.

It should be further noted that in step S3, the brightness detector is activated to monitor the natural brightness around the target area when the array light source is not turned on, and the signal bit counter obtains the bit rate of the UAV image transmission signal at this natural brightness .

It needs to be further explained that, in the step S3, if the signal recognizer detects the UAV image transmission signal, the signal storage stores the UAV image transmission signal.

As shown in Figure 5, first use the brightness detector to measure the natural brightness around the current target area. If the UAV continues to shoot in the target area, with the array light source turned off, the signal collector collects the UAV image transmission signal at this time and It is transmitted to the signal bit counter, and the bit rate B1 of the UAV image transmission signal is measured. When the array light source is turned on, the signal collector collects the UAV image transmission signal at this time and transmits it to the signal bit counter, and the measured UAV image transmission signal bit rate B2 when the light source is lit. Send B1 and B2 to the signal bit rate comparator to calculate the increase rate of the UAV image transmission signal bit rate B2 and the measured UAV image transmission signal bit rate B1 when the array light source is lit. V, where,

(V>0).

In particular, the light source controller continuously adjusts the light source coding sequence of the array light source, compares the increase rate V under different coding sequences, and selects the coding sequence that maximizes the U bit rate of the UAV image transmission signal bit rate under the natural brightness. The best coding sequence. The greater the value V of the UAV image transmission signal bit rate increase, the more it can be determined that the UAV is shooting a regional light source target. Further, the best coding matching algorithm can be used to obtain the best coding sequence under each natural brightness.

For those skilled in the art, various corresponding changes and modifications can be given according to the above technical solutions and concepts, and all these changes and modifications should be included in the protection scope of the claims of the present invention.

Claims (9)

1. A detection drone shooting system, characterized by including a controllable flash module, a drone signal detection and identification module, a drone signal processing module and an alarm, the drone signal detection and identification module and the controllable flash module respectively Communicate with the UAV signal processing module to collect radio signals outside the target area and identify whether the UAV image transmission signal, if it is recognized as the UAV image transmission signal, transmit the signal to the UAV signal processing module and start Controllable flash module; a controllable flash module is set around the target area. The controllable flash module is used to detect the brightness around the target area to control the turning on of the flashing light source. The UAV signal processing module is used to compare the start of the controllable flash module The bit rate of the UAV image transmission signal before and after the controllable flash module is started to determine whether the UAV is shooting; the alarm is connected to the UAV signal processing module for judgment in the UAV signal processing module An alarm is issued when the drone shoots the target area.
2. The system for detecting a drone according to claim 1, wherein the controllable flash module includes an array light source, a brightness detector, and a light source controller, and an array light source is provided around the target area, and the light source controller is The communication connection between the array light source and the UAV signal detection and identification module is used to start the array light source and control the flashing rule of the array light source after the UAV signal detection and identification module recognizes the UAV image transmission signal. The brightness detector is used to detect the array light source The brightness of the target area before turning on.
3. The system for detecting an unmanned aerial vehicle according to claim 1, wherein the UAV signal detection and recognition module includes a signal collector, a signal classifier, a signal feature database, and a signal recognizer, and the signal collector is used to collect targets The radio signal around the area is transmitted to the signal classifier and the signal is transmitted to the UAV signal processing module when the signal recognizer determines the UAV image transmission signal; the signal classifier is used to extract the signal characteristics and completion characteristics of the radio signal Classification and transmission to the signal recognizer; the signal feature database is used to store the existing UAV image transmission signal characteristics; the signal identifier is used to compare the classified signal characteristics with the existing UAV image transmission signal characteristics of the signal characteristics database And identify whether the signal is a UAV image transmission signal, if the recognition is a UAV image transmission signal, start the controllable flash module.
4. The system for detecting an unmanned aerial vehicle according to claim 3, characterized in that the unmanned aerial vehicle detection and identification module further includes a signal storage, and the signal storage is in communication with the signal identification device for identification in the signal identification device Store the UAV image after transmitting the signal.
5. The detection drone shooting system according to claim 1, wherein the drone signal processing module includes a signal bit counter and a signal bit rate comparator, the signal bit counter is used to calculate detection and identification from the drone signal The bit rate of the UAV image transmission signal transmitted from the module before the light source of the controllable flash module is turned on and after the light source of the controllable flash module is turned on and transmitted to the signal bit rate comparator; the signal bit rate comparator is used to compare the The signal bit rate before the light source of the controlled flash module and after the light source of the controllable flash module is turned on to determine whether the drone is shooting the target area, and the communication connection between the alarm and the signal bit rate comparator is used when the drone targets the target An alarm is issued when the area is being photographed.
6. The working method for detecting a drone shooting system according to any one of claims 1-5, comprising the following steps:

   S1 places the controllable flash module around the target area, and turns on the UAV signal detection and identification module and the UAV signal processing module;

   S2 UAV signal detection and recognition module collects radio signals around the target area and recognizes whether the signal is a UAV image transmission signal;

   S3 If the UAV signal detection and recognition module recognizes the UAV image transmission signal, the UAV signal detection and recognition module transmits the UAV image transmission signal to the UAV signal processing module;

   The S4 UAV signal detection and identification module sends a signal to start the controllable flash module, after detecting the brightness when the light source is not turned on, turn on the light source that flashes according to the coding sequence;

   The S5 UAV signal detection and identification module collects the UAV image transmission signal after the light source of the controllable flash module is started and transmits it to the UAV signal processing module. The UAV signal processing module compares the controllable flash module before and after starting. After the controllable flash module is activated, the UAV image transmission signal bit rate is used to determine whether the drone is shooting. If the former bit rate is greater than the latter, the UAV signal recognition module continues to collect radio signals around the target area ; If the bit rate of the latter is greater than the former, it means that the drone is shooting the target area;

   S6 When the UAV signal processing module judges that the UAV is taking pictures of the target area, the alarm starts to issue an alarm.
7. The working method for detecting a drone shooting system according to claim 6, wherein the coding sequence in step S4 is determined by the number of light sources turned on, the light source's on time and off time.
8. The working method for detecting a drone shooting system according to claim 6, characterized in that in step S3, the controllable flash module is activated to monitor the natural brightness around the target area when the light source is not turned on, and the drone signal The processing module obtains the bit rate of the UAV image transmission signal under the natural brightness.
9. The working method for detecting a drone shooting system according to claim 6, characterized in that in step S3, the drone signal detection and identification module stores the signal after identifying the UAV image transmission signal.

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