All-frequency-band distributed GPS detector

Abstract

This utility model discloses a full-band distributed GPS detector, belonging to the field of signal detection. It includes a main control MCU chip, an antenna receiving circuit, a power supply circuit, a buzzer circuit, a display circuit, a key input circuit, and a power-on self-locking circuit. The main control MCU chip uses an STM32F107 as the control core of the entire detector, coordinating the operation of each circuit. This utility model achieves full-band coverage detection by setting multiple antenna receiving ports and corresponding signal processing circuits, enabling the detection of interference and deceptive signals in different frequency bands. The distributed detection method allows for the deployment of multiple detectors over a large area, expanding the detection range and meeting the monitoring needs of large airports, ports, and other areas. Furthermore, the distributed setup provides redundancy and backup mechanisms; if one detector fails, other detectors can still operate, improving the reliability of the entire monitoring system.

Description

Technical Field

[0001] This utility model relates to the field of signal detection technology, and in particular to a full-band distributed GPS detector. Background Technology

[0002] Currently, GPS detection equipment on the market has significant limitations. Different types of signals occupy different communication frequency bands, and existing detection equipment can usually only detect one or a few signal frequency bands, failing to achieve full-band coverage. Since different interference and spoofing signals may be distributed across different frequency bands of GPS signals—for example, early GPS interference signals were mostly concentrated in the L1 band, and corresponding detectors were designed only for this band—these detectors become ineffective when new interference signals appear in other frequency bands such as L2 and L5.

[0003] Furthermore, traditional GPS detectors are mostly single-point detectors, meaning a single device can only detect signals at its installation location, resulting in a very limited detection range. In large areas such as airports and ports, single-point detectors cannot meet the GPS signal monitoring needs of the entire area. Moreover, if a single-point detector fails, there will be a gap in GPS signal monitoring for that area, lacking effective redundancy and backup mechanisms, leading to low reliability of the entire monitoring system.

[0004] Therefore, a GPS detector is needed that can achieve full-band coverage detection and large-area detection through distributed detection, so as to achieve convenient and efficient detection. Utility Model Content

[0005] To address the shortcomings of existing technologies, this utility model provides a full-band distributed GPS detector that enables full-band coverage detection and large-area detection, conveniently and efficiently detecting signal types and sources, and solving the problems of existing GPS detectors such as inability to achieve full-band coverage detection, limited detection range, and low reliability.

[0006] Technical solution: To solve the above-mentioned technical problems, according to one aspect of this utility model, more specifically, a full-band distributed GPS detector, including a main control MCU chip, an antenna receiving circuit, a power supply circuit, a buzzer circuit, a display circuit, a key input circuit, and a power-on self-locking circuit.

[0007] The main control MCU chip is an STM32F107, which serves as the control core of the entire detector and coordinates the operation of various circuits.

[0008] The antenna receiving circuit works as follows: the signal received by the antenna is input to port SSS01, amplified by IC17, then processed by IC15B and IC15A for filtering and impedance matching, and finally converted into a logarithmic output by AD8314. The AIN port is connected to the AN port, and there are four antenna receiving ports, each with two AIN outputs. Through multiple antenna receiving ports and signal processing components, the circuit enables the reception and processing of signals from different frequency bands, providing a foundation for full-band detection.

[0009] The power supply circuit includes a 12V to 3.3V power supply circuit and a step-down section in the power-on self-locking circuit. In the 12V to 3.3V power supply circuit, the power input port is connected to AC / DC 12V, which is filtered by C1 and C14 before being input to the VIN port. The MP1584 is a step-down regulator that can output from the FREQ port. R2 is a voltage divider resistor, providing a stable +5V output voltage. In the power-on self-locking circuit, the POWER_IN port is connected to the +5V port, and the SPX3819 chip steps down the voltage to +3.3V, with the capacitors acting as filters. This provides a stable voltage for the entire detector, ensuring the normal operation of all components.

[0010] Buzzer circuit: A current-limiting resistor R9 (1KΩ) is connected from the MCU's buzzer port, then to the base of a transistor. The emitter is grounded, the collector is connected to the negative terminal of the buzzer, and the positive terminal is connected to 3.3V. When the BUZZER port is high, the transistor conducts and the buzzer sounds; conversely, when it is low, it does not sound. This circuit is used to issue an alarm when a specific signal is detected or an abnormal situation occurs.

[0011] The display circuit includes a 1.8-inch LCD display circuit and a digital tube display circuit. The 1.8-inch LCD display circuit connects the MSP1803 LCD screen to the MCU, controlling the LCD display content. The LCD_LED pin is controlled by the LCD_BLK pin; a low level input to LCD_BLK lowers the gate voltage of the MOSFET than its source voltage, turning on the MOSFET. LCD_LED operates at 3.3V. The digital tube display circuit connects a 74HC595 shift register to the MCU interface, receiving serial control signals and converting them into parallel signals, which are then connected to the LEDs to control the digital tube's illumination. This displays detected signal information and other content for user viewing.

[0012] The button input circuit consists of four buttons. Pins 2, 3, and 4 are all grounded, and pin 1 is connected to the MCU's button input port K. When a button is pressed, pin 1 is connected to ground, and the port level is pulled low. This facilitates user operation and settings.

[0013] Power-on self-locking circuit: After the button is triggered, the circuit self-locks to maintain continuous power supply. When K1 is pressed and grounded, the MOSFET turns on, connecting the +5V port to POWER_IN. The MCU makes the POWER_ON signal valid, turning on transistor Q2 and grounding it. The MOSFET also turns on, keeping the +5V port continuously connected to POWER_IN. This ensures the detector can operate stably and continuously.

[0014] Furthermore, compared with the existing technology, the innovation of this utility model is that: previous technologies could only detect 2G signals, while this technical solution adds many detectable signal types, such as 4G, 5G, Bluetooth and WIFI, achieving a wider signal detection coverage. At the same time, through distributed settings, it can achieve detection over a large area.

[0015] The beneficial effects of this utility model of a full-band distributed GPS detector are as follows:

[0016] (1) This utility model achieves full-band coverage detection by setting up multiple antenna receiving ports and corresponding signal processing circuits, enabling the detection of interference and deceptive signals in different frequency bands; the distributed detection method allows for the deployment of multiple detectors in a large area, expanding the detection range and meeting the monitoring needs of large airports, ports, and other areas; furthermore, the distributed setup has a certain degree of redundancy and backup mechanism, ensuring that other detectors can still operate when one detector fails, thus improving the reliability of the entire monitoring system. In addition, the collaborative operation of each circuit component enables convenient and efficient detection of signal type and source. Attached Figure Description

[0017] The present invention will now be described in further detail with reference to the accompanying drawings and specific implementation methods.

[0018] Figure 1 This is a schematic diagram of the main control MCU chip circuit in this utility model;

[0019] Figure 2 This is a schematic diagram of the antenna receiving circuit in this utility model;

[0020] Figure 3 This is a schematic diagram of the signal transfer and distribution circuit of the antenna receiving circuit in this utility model.

[0021] Figure 4 This is a schematic diagram of the 12V to 3.3V power supply circuit in this utility model;

[0022] Figure 5 This is a schematic diagram of the step-down section in the power-on self-locking circuit of this utility model;

[0023] Figure 6 This is a schematic diagram of the buzzer circuit in this utility model;

[0024] Figure 7 This is a schematic diagram of the 1.8-inch LCD display circuit in this utility model;

[0025] Figure 8 This is a schematic diagram of the digital tube display circuit in this utility model;

[0026] Figure 9 This is a schematic diagram of the key input circuit in this utility model;

[0027] Figure 10 This is a schematic diagram of the self-locking circuit upon power-on in this utility model;

[0028] Figure 11 This is a schematic diagram of the structure of this utility model. Detailed Implementation

[0029] The present invention will be described in detail below with reference to the accompanying drawings and embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in the present application can be combined with each other.

[0030] To make the technical solution of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0031] Reference Figures 1-11 A full-band distributed GPS detector includes a main control MCU chip, an antenna receiving circuit, a power supply circuit, a buzzer circuit, a display circuit, a key input circuit, and a power-on self-locking circuit. The circuit connections and operating processes of each part are as follows:

[0032] The STM32F107 MCU chip serves as the control core, coordinating the operation of the antenna receiving circuit, power supply circuit, buzzer circuit, display circuit, key input circuit, and power-on self-locking circuit.

[0033] In the antenna receiving circuit, the SSS01 port receives the signal from the antenna. After being amplified by IC17, it is filtered and impedance matched by IC15B and IC15A. Then, the analog signal is converted into a logarithmic proportional signal by AD8314 logarithmic amplifier and transmitted to the MCU's AN port via the AIN port. The four antenna receiving ports receive signals from different regions or of different types. The two AIN ports of each port output signals for MCU processing, realizing the reception and preliminary processing of full-band signals.

[0034] In the power supply circuit, the AC / DC 12V power supply is processed by a 12V to 3.3V power supply circuit, filtered by C1 and C14, and then input to the VIN port. The MP1584 step-down regulator operates, outputting a voltage at the FREQ port. This voltage is then divided by R2 to obtain a stable +5V voltage. In the power-on latch-up circuit, the POWER_IN port is connected to the +5V port. After being stepped down by the SPX3819 chip and filtered by capacitors, a +3.3V voltage is output to power the various circuit components.

[0035] When power-on is required, press K1 in the power-on self-locking circuit. K1 is grounded, which turns on the MOSFET. The +5V port is connected to POWER_IN. The MCU controls the POWER_ON signal to be valid, and the transistor Q2 is grounded. The MOSFET continues to conduct, keeping the +5V port connected to POWER_IN, thus achieving circuit self-locking and maintaining continuous power supply.

[0036] The four buttons in the key input circuit are used for user operation. When a button is pressed, pin 1 is connected to ground, and the corresponding MCU button input port K level is pulled low. After the MCU detects the level change, it executes the corresponding operation.

[0037] In the display circuit, the 1.8-inch LCD screen MSP1803 is connected to the MCU. The MCU controls the LCD to display the detected signal information and other content. The LCD_BLK pin controls the power supply of LCD_LED. When the input is low, the MOSFET is turned on, and LCD_LED receives 3.3V voltage to light up. The digital tube display circuit converts the serial control signal sent by the MCU into a parallel signal through the 74HC595 shift register to control the LED to light up and realize digital display.

[0038] In the buzzer circuit, when the MCU's BUZZER port outputs a high level, the current-limiting resistor R9 provides current to the base of the transistor, the transistor conducts, and the buzzer is powered on and emits a sound for alarm purposes; when the BUZZER port is at a low level, the transistor is cut off, and the buzzer does not work.

[0039] By distributing multiple GPS detectors of this invention over a large area, comprehensive monitoring of the area can be achieved. Each detector transmits the detected signal information to the control center, enabling convenient and efficient detection of signal type and source.

[0040] The embodiments described above are merely illustrative of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of this utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A full-band distributed GPS detector, characterized in that, It includes the main control MCU chip, antenna receiving circuit, power supply circuit, buzzer circuit, display circuit, key input circuit and power-on self-locking circuit; The main control MCU chip is an STM32F107, which serves as the control core of the entire detector and coordinates the operation of various circuits. The antenna receiving circuit has an SSS01 port, which receives the signal received by the antenna. The signal is amplified by IC17, filtered and impedance matched by IC15B and IC15A, and finally converted into a logarithmic proportional signal by AD8314 logarithmic amplifier and output to AIN port. AIN port is connected to AN port and has four antenna receiving ports, each with two AIN port outputs. The power supply circuit includes a 12V to 3.3V power supply circuit and a step-down section in the power-on self-locking circuit. In the 12V to 3.3V power supply circuit, the power input port is connected to AC / DC 12V, which is filtered by C1 and C14 and then input to the VIN port. The MP1584 step-down regulator outputs voltage at the FREQ port, which is divided by R2 to obtain a stable +5V output voltage. In the power-on self-locking circuit, the POWER_IN port is connected to the +5V port, and the +3.3V output is stepped down by the SPX3819 chip, and a capacitor is provided for filtering. In the buzzer circuit, the MCU's buzzer port is connected to the base of a transistor via a current-limiting resistor R9. The transistor's emitter is grounded, its collector is connected to the negative terminal of the buzzer, and the positive terminal of the buzzer is connected to a 3.3V voltage. When the BUZZER port is high, the transistor is turned on, and the buzzer sounds. When the BUZZER port is low, the transistor is turned off, and the buzzer does not sound. The display circuit includes a 1.8-inch LCD display circuit and a digital tube display circuit. The 1.8-inch LCD display circuit connects the MSP1803 LCD screen to the MCU. The LCD_LED pin is controlled by the LCD_BLK pin. When the LCD_BLK input is low, the MOSFET is turned on, and LCD_LED is 3.3V. The digital tube display circuit connects the 74HC595 shift register to the MCU interface, receives serial control signals and converts them into parallel signals, which are then connected to the LEDs to control the digital tubes to light up. The key input circuit has four keys. Pins 2, 3, and 4 of the keys are grounded, and pin 1 is connected to the key input port K of the MCU. When the key is pressed, pin 1 is connected to ground, which pulls the port level low. In the power-on self-locking circuit, the circuit self-locks after the button is triggered to maintain continuous power supply. When K1 is pressed and grounded, the MOSFET is turned on, the +5V port is connected to POWER_IN, the MCU makes the POWER_ON signal valid, the transistor Q2 is turned on and grounded, and the MOSFET is continuously turned on to maintain the +5V port connected to POWER_IN.

2. The full-band distributed GPS detector according to claim 1, characterized in that, The current-limiting resistor R9 has a resistance of 1K.

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