Low-false-alarm-rate PN junction detection device suitable for multiple scenes

Abstract

The utility model discloses a low-false-alarm-rate PN junction detection device suitable for multiple scenes. Relates to defense equipment. Comprising a transmitting module and a receiving module. The transmitting module comprises a radio frequency generation module which comprises a plurality of frequency sources, a first combiner, a first amplifier and a power divider which are connected in sequence; the frequency source is connected with the first controller; the plurality of transmitting antennas are electrically connected with the power divider through first radio frequency cables respectively; the radio frequency receiving and processing module comprises a second combiner, a second amplifier, a band-pass filter, a down-converter and a processor which are connected in sequence; the processor is connected with the second controller; and the plurality of receiving antennas are electrically connected with the second combiner through second radio frequency cables respectively. According to the utility model, false alarms caused by secondary harmonics generated by equipment are avoided.

Description

TECHNICAL FIELD

[0001] The utility model relates to a defense equipment especially to a low false alarm rate PN junction detection device suitable for multiple scenes. BACKGROUND

[0002] The nonlinear detector is a very important defense equipment, mainly used for searching and positioning electronic devices in the active state or closed state, initiation device and other similar devices containing semiconductor elements, such as mobile phones, wiretaps, loudspeakers, recorders, infrared or ultrasonic data and control channel devices, remote controllers (electric initiation device) and the like. The nonlinear detector is widely used in military reconnaissance, anti-terrorism and riot, prison contraband search, criminal investigation and technical investigation, search and rescue search, tracking search, secret meeting investigation, privacy protection and other fields, and is particularly suitable for the increasingly fierce examination of high-tech cheating prevention in China.

[0003] Electronic devices almost inevitably contain nonlinear junctions, usually PN junctions. Under external radio frequency excitation, PN junctions will inevitably absorb excitation signals and generate second harmonics of the signals. By detecting the size and change rule of the second harmonics, the PN junctions can be effectively detected.

[0004] The challenge of developing a nonlinear detector mainly comes from the harmonics generated by the device itself. The nonlinear detector is also an electronic device, and is very complex, with a large number of semiconductor devices inside, and various types of electrical contacts between its antenna and circuit, which can all generate harmonics. Moreover, due to high integration, these harmonic-generating parts are closer to the detector than the detected objects, and are more likely to be detected by themselves, resulting in false alarms. INVENTION CONTENTS

[0005] The utility model provides a compact structure, avoid a kind of low false alarm rate PN junction detection device suitable for multiple scenes to solve above problem.

[0006] The technical scheme of the utility model is:

[0007] A low false alarm rate PN junction detection device suitable for multiple scenes, comprising a transmitting module and a receiving module; the transmitting module comprises:

[0008] A radio frequency generating module comprising a plurality of frequency sources, a first combiner, a first amplifier and a power divider connected in sequence; the frequency source is connected with a first controller;

[0009] A transmitting antenna is provided with a plurality of transmitting antennas, which are electrically connected with the power divider through first radio frequency cables respectively;

[0010] The receiving module comprises:

[0011] The radio frequency receiving processing module comprises a second combiner, a second amplifier, a band pass filter, a down converter and a processor connected in sequence; the processor is connected with the second controller;

[0012] The receiving antenna is provided with a plurality of receiving antennas, which are respectively electrically connected with the second combiner through second radio frequency cables.

[0013] Specifically, the radio frequency generating module is powered by a battery.

[0014] Specifically, the transmitting antenna is an omnidirectional antenna or a directional antenna.

[0015] Specifically, the frequency source comprises a frequency source one and a frequency source two connected in parallel.

[0016] Specifically, the frequency source is of a model of FW-2000.

[0017] Specifically, the first controller is of a model of STM32F103RCT6.

[0018] Specifically, the second controller is of a model of STM32F103RCT6.

[0019] Specifically, the processor is of a model of ZYNQ7020.

[0020] The utility model discloses a transmitting module and receiving module, the radio frequency generating module of transmitting module comprises a plurality of frequency sources, a first combiner, a first amplifier and a power divider connected in sequence, and the radio frequency receiving processing module of receiving module comprises a second combiner, a second amplifier, a band pass filter, a down converter and a processor connected in sequence, the frequency source 1 and the frequency source 2 of transmitting module generate continuous wave signals of frequency f1 and f2 respectively, two signals become four f1+f2 signals after combiner, amplifier, power divider, four signals are sent to transmitting antenna respectively, and transmitting power can be adjusted by controller. After four antennas of receiving module receive f1+f2 signals, become a signal after combiner, then amplify, band pass filter, mainly filter 2*f1 and 2*f2 harmonic, thereby avoiding the false alarm caused by the second harmonic of equipment itself. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 It is the hardware architecture schematic drawing of transmitting module;

[0022] Figure 2 It is the hardware architecture schematic drawing of receiving module;

[0023] Figure 3 It is the important place entrance layout schematic drawing;

[0024] Figure 4 It is the transmission device layout schematic drawing. DETAILED DESCRIPTION

[0025] Embodiments of the present application will be described in detail below, examples of which are shown in the drawings, wherein the same or similar reference numbers represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary and are only used to explain the present application, and cannot be understood as a limitation of the present application.

[0026] Reference will be made to Figures 1-4 describe the present application;

[0027] A low false alarm rate PN junction detection device suitable for multiple scenes, comprising a transmitting module and a receiving module; the transmitting module comprises:

[0028] As Figure 1 shown, the radio frequency generating module is a miniaturized machine box, comprising a plurality of frequency sources, a first combiner, a first amplifier and a power divider connected in sequence; the frequency source is connected with the first controller;

[0029] The transmitting antenna is provided with a plurality of, which are electrically connected with the power divider through first radio frequency cables respectively; the transmitting antenna is an omnidirectional antenna or a directional antenna, and the number is 1-4 and can be configured.

[0030] The radio frequency generating module is designed with a power consumption of not more than 20w, and the antenna radiation equivalent power is maximum 2w, and the size is adjustable. The module is powered by a rechargeable battery, and can meet 5 hours of continuous work in full power state.

[0031] The frequency source of the transmitting module is provided with two, which are frequency source 1 and frequency source 2, which respectively generate continuous wave signals with frequencies f1 (3.5GHz) and f2 (3.6GHz), two signals become four signals f1+f2 after passing through the first combiner, the first amplifier and the power divider, and the four signals are sent to the transmitting antenna, and the transmitting power can be adjusted by the controller.

[0032] The receiving module comprises:

[0033] The radio frequency receiving processing module comprises a second combiner, a second amplifier, a band pass filter, a down converter, a processor, a second controller and a display screen connected in sequence;

[0034] The receiving antenna is provided with a plurality of, which are electrically connected with the second combiner through second radio frequency cables respectively.

[0035] The hardware architecture of the receiving module is as shown in Figure 2As shown, including radio frequency receiving processing module, second radio frequency cable and detachable receiving antenna. Radio frequency receiving processing module is miniaturized machine box, which is composed of second controller, display screen, processor, down converter, band pass filter, second amplifier, second combiner and the like. The receiving antenna can be selected omnidirectional or directional antenna according to different use scenarios, and the number is 1~4 configurable. The whole module design power consumption is not greater than 20w, the module is powered by rechargeable battery, and the full power state can meet 5 hours continuous work.

[0036] After the four antennas of the receiving module receive the f1+f2 signal, it becomes a signal through the second combiner, and then is amplified, band pass filtered (filter center frequency 7.1GHz, bandwidth 50MHz), mainly to filter out 2*f1 and 2*f2 harmonics, so as to avoid false alarm caused by the second harmonic of the device itself. The filtered signal is sent to the down converter to convert the 7.1GHz radio frequency signal to 80MHz intermediate frequency. The processor is the architecture of FPGA plus high-speed ADC, with a sampling rate of 250MSPS. The high-speed ADC samples the 80MHz intermediate frequency signal, and the sampled digital signal is sent to the FPGA for processing. Through multi-point correlation processing and selecting appropriate alarm threshold, when the receiving module detects the signal, the buzzer alarm is driven immediately, and the signal energy size is displayed in the form of energy grid on the display screen.

[0037] In this case, the frequency source model is: FW-2000

[0038] The first controller model is: STM32F103RCT6

[0039] The second controller model is: STM32F103RCT6

[0040] The processor model is: ZYNQ7020

[0041] Example one:

[0042] Various secret places, large examination rooms, parts with intellectual property theft risk, etc. The entrances of electronic devices such as mobile phones, tablet computers, cameras, recorders, eavesdroppers, pinhole cameras and the like shall be detected. The detection system proposed in the case can be installed and arranged at the entrance of these places Figure 3 As shown, a set of transmitting device is installed on one side of the entrance, the antenna is directional antenna, and the number of antennas is determined according to actual demand. A set of receiving device is installed on the other side of the entrance, the antenna is directional antenna, and the number of antennas is determined according to actual demand. The system can quickly detect and alarm all devices with PN junction within a certain range near the entrance.

[0043] Example two:

[0044] There are a large number of luggage and goods to be transported in airports, wharfs, high-speed rail stations and the like, and electronic detonation circuits and the like in suspected explosive devices hidden in the luggage and goods are difficult to be detected by traditional X-ray inspection, and need to be detected by corresponding nondestructive detection means. The nonlinear node detector is used to meet the detection needs of these scenes, and can be installed on the goods conveying device in these places according to the installation arrangement shown in FIG. 1 to detect the detection system. Figure 4

[0045] For the disclosed content, the following points need to be explained:

[0046] (1) The disclosed embodiments only involve the structures involved in the disclosed embodiments, and other structures can refer to the usual design.

[0047] (2) In the case of no conflict, the disclosed embodiments and the features in the embodiments can be combined to obtain new embodiments.

[0048] The above is only a specific implementation of the disclosure, but the protection scope of the disclosure is not limited thereto, and the protection scope of the disclosure should be subject to the protection scope of the claims.​

Claims

1. A low false alarm rate PN junction detection device suitable for multiple scenarios, comprising a transmitting module and a receiving module; characterized in that, The transmitting module comprises: The radio frequency generating module comprises a plurality of frequency sources, a first combiner, a first amplifier and a power divider connected in sequence; the frequency sources are connected with the first controller; The transmitting antenna is provided with a plurality of antennas, which are respectively electrically connected with the power divider through first radio frequency cables; The receiving module comprises: The radio frequency receiving processing module comprises a second combiner, a second amplifier, a band pass filter, a frequency down converter and a processor connected in sequence; the processor is connected with the second controller; The receiving antenna is provided with a plurality of antennas, which are respectively electrically connected with the second combiner through second radio frequency cables.

2. The low false alarm rate PN junction detection device suitable for multiple scenarios according to claim 1, characterized in that, The radio frequency generating module is powered by a battery.

3. The low false alarm rate PN junction detection device for multiple scenarios of claim 1, wherein, The transmitting antenna is an omnidirectional antenna or a directional antenna.

4. The low false alarm rate PN junction detection device for multiple scenarios of claim 1, wherein, The frequency source comprises frequency source one and frequency source two connected in parallel.

5. The low false alarm rate PN junction detection device suitable for multiple scenarios according to claim 4, characterized in that, The model of the frequency source is FW-2000.

6. The low false alarm rate PN junction detection device for multiple scenarios of claim 1, wherein, The model of the first controller is STM32F103RCT6.

7. The low false alarm rate PN junction detection device for multiple scenarios of claim 1, wherein, The model of the second controller is STM32F103RCT6.

8. The low false alarm rate PN junction detection device for multiple scenarios of claim 1, wherein, The model of the processor is ZYNQ7020.

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