Monitoring and positioning system for passenger violation electromagnetic signals in civil aviation airliner

Abstract

The utility model discloses a monitoring and positioning system for passenger violation electromagnetic signals in a civil aviation passenger plane, which consists of two electromagnetic signal receiving and detecting devices which have the same structure and are respectively arranged at the head part and the tail part in a civil aviation passenger cabin, each electromagnetic signal receiving and detecting device comprises a Zynq7020 chip, an ad9361 chip, a key input control circuit, an LCD (Liquid Crystal Display) and an audio broadcasting circuit; the Zynq7020 chip is electrically connected with the ad9361 chip, the key input control circuit, the LCD and the audio broadcasting circuit; expansion network ports of the two Zynq7020 chips are connected through a network cable, one radio frequency input port of the ad9361 chip is connected with an antenna, and the other radio frequency input port of the ad9361 chip is connected with a radio frequency output port of the other integrated RF transceiver chip. According to the utility model, in the take-off and landing process and the constant-height flight process of the airplane, the electromagnetic signals radiated by passengers in the civil aviation passenger cabin can be automatically monitored and positioned, and the passengers at the position are reminded to shut down the airplane in time.

Description

Technical Field

[0001] The utility model relates to the technical field of electromagnetic signal monitoring, in particular to a monitoring and positioning system for electromagnetic signals violated by passengers in civil aviation passenger aircraft. Background Art

[0002] Both the International Civil Aviation Organization and China's domestic civil aviation regulations have clear provisions on the use of electronic devices during flight of civil aircraft.

[0003] According to the relevant regulations of the International Civil Aviation Organization: During takeoff, landing, and critical phases of flight (such as climbing, turning, and descending), passengers must turn off all non-essential electronic devices, including mobile phones, tablets, electronic game consoles, etc.; in other phases of flight, these devices can be used, but they must be set to flight mode to ensure that they do not actively radiate electromagnetic signals.

[0004] In 2018, my country issued the "Guidelines for the Assessment of the Use of Portable Electronic Devices (PEDs) on Board," stipulating that airlines can regulate the use of electronic devices in an orderly manner based on their own circumstances, including the use of "flight mode" during takeoff and landing. While the decision to allow passengers to use electronic devices has been left to the discretion of each airline since 2018, it does specify that electronic devices must be in "flight mode," which prohibits them from emitting electromagnetic signals to ensure flight safety. Therefore, passengers are currently prohibited from illegally radiating electromagnetic signals in civil aviation cabins.

[0005] Currently, the following two technologies are mainly used to monitor and locate illegal electromagnetic radiation signals:

[0006] (1) Electromagnetic signal monitoring and direction finding cross-positioning technology

[0007] In the field of radio signal monitoring and positioning, after an abnormal electromagnetic signal is detected, the direction of the electromagnetic signal is usually measured using an interferometer direction finding method through two or more direction finding receiving devices. After each direction finding receiving device measures the direction, a direction finding line can be obtained. The intersection of two or more direction finding lines is the location of the electromagnetic radiation source that emits the abnormal electromagnetic signal.

[0008] When this technology is applied in the cabin of a civil airliner, since the cabin is a long and narrow space, if only two direction-finding receiving devices are arranged at the head and tail of the cabin, the direction-finding line formed will be almost parallel to the cabin body of the cabin, the intersection position will be very vague, and the positioning accuracy will be very low.

[0009] On the other hand, direction-finding receiving equipment generally uses the interferometer direction-finding method to find the direction of electromagnetic signals, which usually requires the use of antenna arrays and multi-channel receivers, and the equipment cost is relatively high. In addition, due to the large size of the antenna array, it is difficult to find an installation location for the direction-finding antenna array in such a small space as a civil aircraft cabin, so this technology is difficult to put into practical use in civil aviation cabins.

[0010] (2) Portable electromagnetic signal direction finding and indication technology

[0011] Portable electromagnetic signal direction-finding and indication technology usually uses a broadband directional beam antenna to amplify the signal received by the antenna and then detect the strength of the received signal. During the detection, the operator holds the antenna and moves it to scan different directions in space. The antenna indication direction with the largest scanned signal strength is used as the direction of the electromagnetic signal. The operator then gradually searches for the location of the electromagnetic signal radiation source along the direction of the wave.

[0012] Using portable electromagnetic signal receiving and direction-finding equipment to find the direction of electromagnetic signals in civil aircraft cabins requires a professional to carry an antenna with a directional beam and walk from the front to the rear of the cabin with the electromagnetic signal receiving and direction-finding equipment on their back. During this movement, the antenna is used to align the beam with the position of each passenger. After receiving the signal, it is determined whether there are any abnormal electromagnetic signal emissions. This process not only requires manual operation by professionals, but also requires the operator to walk back and forth in the cabin. During the takeoff and descent phases of civil aircraft, as well as at critical stages during the flight, the safety manual explicitly stipulates that all personnel must fasten their seat belts and are prohibited from walking in the cabin to ensure personnel safety. Therefore, this technology cannot be applied in real-world scenarios. Utility Model Content

[0013] The purpose of the utility model is to provide a monitoring and positioning system for electromagnetic signals of passengers violating regulations in civil aircraft, which has the advantages of accurate positioning and convenient monitoring, in order to address the deficiencies of the existing technology.

[0014] The purpose of this utility model is achieved through the following technical solutions:

[0015] A monitoring and positioning system for electromagnetic signals of passengers in civil aircraft consists of two electromagnetic signal receiving and detection devices with the same structure. The two electromagnetic signal receiving and detection devices are respectively installed at the front and rear of the civil aircraft cabin. Each electromagnetic signal receiving and detection device includes an embedded ARM+FPGA chip, an integrated RF transceiver chip, an LCD display and a key input control circuit. The embedded ARM+FPGA chip is used as a main control and signal processing chip; the integrated RF transceiver chip is electrically connected to the embedded ARM+FPGA chip to input the sampled signal into the DDR3 memory expanded outside the embedded ARM+FPGA chip; the key input control circuit is used to control the input signal of the embedded ARM+FPGA chip. The key input control circuit is electrically connected to the embedded ARM+FPGA chip for inputting control parameters and command parameters for human-computer information interaction; the LCD display is electrically connected to the embedded ARM+FPGA chip for displaying monitoring and positioning results; the expansion network ports of the two embedded ARM+FPGA chips are connected via a network cable, and the two integrated RF transceiver chips are each externally connected to an RF output port and two RF input ports, one of the RF input ports is connected to an antenna, and the other RF input port is connected to the RF output port of another integrated RF transceiver chip via an RF cable to calibrate the acquisition time error between the two electromagnetic signal receiving and detection devices.

[0016] Furthermore, the embedded ARM+FPGA chip is a Zynq7020 chip.

[0017] Furthermore, the integrated RF transceiver chip is an AD9361 chip.

[0018] Furthermore, the electromagnetic signal receiving and detecting device also includes an audio broadcast circuit, which is electrically connected to the embedded ARM+FPGA chip and is used to generate voice to remind the cabin attendant to handle it.

[0019] Furthermore, the antenna is a broadband receiving antenna with a frequency coverage range of 0.07-6 GHz.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] (1) The present invention can automatically monitor and locate the electromagnetic signals radiated by passengers in a civil aviation cabin, whether during takeoff and landing or when the aircraft is flying at a constant altitude. After obtaining the monitoring and positioning information, the cabin attendant can remind the passengers at their location to turn off the electromagnetic signal radiation source in time, thereby ensuring flight safety.

[0022] (2) The utility model has a simple structure and only requires two electromagnetic signal receiving and detecting devices, and each device adopts a single antenna for receiving, which occupies a small space, is easy to install, has low cost, and has accurate positioning and convenient monitoring. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a structural diagram of the utility model.

[0024] Figure 2 This is a schematic diagram of the electrical connection between two electromagnetic signal receiving and detecting devices of the present invention.

[0025] Figure 3 Schematic diagram of time difference positioning using electromagnetic signal receiving and detection equipment at the fore and aft locations of the cabin. DETAILED DESCRIPTION

[0026] The present invention will be described in further detail below with reference to the accompanying drawings and embodiments, but the protection scope of the present invention is not limited thereto.

[0027] The utility model is designed based on the following time difference positioning method. An electromagnetic signal receiving and detecting device E is installed at the head and tail of the civil aviation cabin. a (hereinafter referred to as E a ) and electromagnetic signal receiving and detecting equipment E b (hereinafter referred to as E b ), receiving electromagnetic signals in the cabin, E a and E b The configured receiving antennas are denoted as A a and A b ,like Figure 3 As shown in the figure, the electromagnetic radiation source H is used as an example for explanation, and H represents the electromagnetic radiation source used illegally by passengers in the civil aviation cabin.

[0028] Note that the electromagnetic radiation source H and the equipment E a Antenna A a The distance between them is d a , electromagnetic radiation source H and equipment E b Antenna A b The distance between them is d b , suppose the electromagnetic signal radiated by the electromagnetic radiation source reaches antenna A a and reaches antenna A b The time difference is Δτ, so the corresponding distance difference Δd can be calculated as follows

[0029] Δd=d a -d b =Δτ·c (1)

[0030] where c≈3×10 8 m / s represents the speed at which electromagnetic waves propagate in air.

[0031] Electromagnetic signal receiving and detecting equipment E a and E bThey are respectively arranged at the head and tail of the civil aviation cabin, E a and E b Antenna A a With A b The distance between them can be measured in advance and is a known value, recorded as d0. Therefore, under the application environment conditions of civil aviation cabins, the following formula is approximately true:

[0032] d0≈d a +d b (2)

[0033] From equations (1) and (2), we can solve d a with d b They are expressed as follows:

[0034]

[0035] From formula (3), we can know that as long as the time difference Δτ is measured, the distance d can be solved a with d b , thereby realizing the positioning of abnormal electromagnetic radiation sources in civil aviation cabins.

[0036] Based on the above time difference positioning method, the monitoring and positioning system for passenger illegal electromagnetic signals in civil aircraft designed in this embodiment consists of two electromagnetic signal receiving and detecting devices E with the same structure. a and electromagnetic signal receiving and detecting equipment E b Composition, such as Figure 1-Figure 2 As shown, the electromagnetic signal receiving and detecting device E a (hereinafter referred to as Equipment E a ) and electromagnetic signal receiving and detecting equipment E b (hereinafter referred to as Equipment E b ) are installed at the front and rear of the civil aviation cabin respectively. Two electromagnetic signal receiving and detecting devices E a and E b They all include embedded ARM+FPGA chips, integrated RF transceiver chips and peripheral circuits. The embedded ARM+FPGA chip is used as the main control and signal processing chip, and adopts the Zynq7020 chip produced by Xilinx. The Zynq7020 chip is expanded with DDR3 memory, SD memory card and network port chip. The network port chip realizes the networking connection between the two electromagnetic signal receiving and detecting devices. The integrated RF transceiver chip adopts the ad9361 chip. The ad9361 chip is electrically connected to the Zynq7020 chip, and inputs the sampling signal into the DDR3 memory expanded by the Zynq7020 chip. The ad9361 chip of each electromagnetic signal receiving and detecting device is externally connected to an RF output port and two RF input ports, such as Figure 2As shown, they are RF output port 1, RF input port 1, and RF input port 2. RF input port 1 is connected to a broadband receiving antenna covering a frequency band of 0.07-6 GHz to receive electromagnetic signals in the cabin. RF output port 1 is connected to RF input port 2 of another AD9361 chip via an RF cable. Similarly, RF output port 1 of another AD9361 chip is connected to RF input port 2 of this AD9361 chip. This connection method can achieve time synchronization and calibration between the two devices.

[0037] The peripheral circuits include a key input control circuit, an LCD display, an audio broadcast circuit, and auxiliary circuits. The key input control circuit is used to input control parameters and command parameters for human-computer information interaction; the LCD display is used to display signal monitoring and positioning results; and the audio broadcast circuit is used to generate audio signals, namely, to generate a prompt tone after detecting and locating electromagnetic signals illegally radiated by passengers, alerting cabin attendants to take action. The key input control circuit, LCD display, and audio broadcast circuit are all electrically connected to the Zynq7020 chip. The auxiliary circuits mainly include a power conversion circuit and a clock management circuit. The power conversion circuit is mainly used to convert the 24V external DC power supply into different power supplies such as 5V, 3.3V, 1.8V, and 1.5V required by different chips in the device. The clock management circuit is mainly used to provide the clock signals of different frequencies required by each chip in the device.

[0038] The working process of the utility model is as follows: the Zynq7020 chip sends a command, the ad9361 chip receives the signal through the broadband receiving antenna, the received signal is amplified, orthogonally converted and filtered inside the ad9361 to become a zero intermediate frequency signal, and then input into the DDR3 memory expanded by the Zynq7020. The C program running on the ARM processor on the Zynq7020 automatically performs FFT fast Fourier transform on the collected signal to obtain the spectrum of the signal, and detects whether there is an electromagnetic signal in the observation frequency band through spectrum threshold judgment. When it is detected that the passenger has violated the radiation regulations, the signal is detected. When an electromagnetic signal is detected, the two devices transmit the collected signal samples to each other through the network cable, that is, the signal samples collected by one electromagnetic signal receiving and detecting device are transmitted to the other electromagnetic signal receiving and detecting device, and then the time difference of the sampled signals is measured by signal cross-correlation operation. After measuring the time difference Δτ, the position of the electromagnetic radiation source in the cabin can be calculated by the above formula (3), and then the position is displayed on the LCD screen, and the audio broadcast circuit is used to remind the flight attendants in audio form that an illegal electromagnetic signal has been radiated in the cabin, thereby completing the entire electromagnetic signal monitoring and positioning process.

[0039] Since the two electromagnetic signal receiving and detecting devices transmit data to each other through the network cable between their network ports, it is necessary to calibrate the acquisition time error between the two devices. b Reference equipment E a Take time synchronization as an example to explain as follows:

[0040] Equipment E a A modulated pulse-per-second signal is transmitted every second through the RF cable 1 to the device E. b , device E b After receiving, deduct the time of the modulated pulse signal transmitted on the RF cable 1 to obtain the device E a The moment when the modulated second pulse signal is emitted, so the device E b The second timing start time of the local clock can be compared with the device E a Align. Similarly, you can also use device E a Reference equipment E b Time synchronization is performed so that device E a With device E b In the case of time synchronization, the collected electromagnetic signal samples can be marked with the sampling time, thereby providing time synchronization for the accurate measurement of the arrival time difference of the electromagnetic signals collected by the two devices.

[0041] The utility model can automatically complete the monitoring and positioning of electromagnetic signals radiated by passengers in a civil aviation cabin, whether during takeoff and landing of an aircraft or during flight at a constant altitude, and has accurate positioning and convenient monitoring.

[0042] The above is only a preferred embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any modification and replacement based on the technical solution and inventive concept provided by the present invention should be included in the protection scope of the present invention.

Claims

1. A monitoring and positioning system for detecting electromagnetic signals of passengers in civil aircraft, characterized by: The system consists of two electromagnetic signal receiving and detecting devices with the same structure, which are installed at the bow and tail of a civil aircraft cabin, respectively. Each electromagnetic signal receiving and detecting device includes an embedded ARM+FPGA chip, an integrated RF transceiver chip, an LCD display, and a key input control circuit. The embedded ARM+FPGA chip serves as a main control and signal processing chip. The integrated RF transceiver chip is electrically connected to the embedded ARM+FPGA chip to input sampling signals into the DDR3 memory expanded externally by the embedded ARM+FPGA chip. The key input control circuit is electrically connected to the embedded ARM+FPGA chip for inputting control parameters and command parameters for human-computer information interaction. The LCD display is electrically connected to the embedded ARM+FPGA chip for displaying monitoring and positioning results. The extended network ports of the two embedded ARM+FPGA chips are connected via a network cable. Both integrated RF transceiver chips are externally connected to an RF output port and two RF input ports, one of which is connected to an antenna, and the other is connected to the RF output port of the other integrated RF transceiver chip via an RF cable to calibrate the acquisition time error between the two electromagnetic signal receiving and detecting devices.

2. The system for monitoring and locating electromagnetic signals of passengers in civil aircraft according to claim 1, characterized in that: The embedded ARM+FPGA chip is a Zynq7020 chip.

3. The system for monitoring and locating electromagnetic signals of passengers in civil aircraft according to claim 2, characterized in that: The integrated RF transceiver chip is the ad9361 chip.

4. The system for monitoring and locating electromagnetic signals of passengers in civil aircraft according to claim 1 or 2, characterized in that: The electromagnetic signal receiving and detecting device further includes an audio broadcast circuit, which is electrically connected to the embedded ARM+FPGA chip and is used to generate voice to remind the cabin attendant to handle the situation.

5. The system for monitoring and locating electromagnetic signals of passengers in civil aircraft according to claim 1, characterized in that: The antenna is a broadband receiving antenna with a frequency coverage range of 0.07-6 GHz.

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