Microwave radar beacon

Abstract

A microwave radar beacon comprises a microwave radar sensor, a wireless transmission module electrically connected with the microwave radar sensor and used for being in communication connection with a local gateway, and a power supply electrically connected with the microwave radar sensor and the wireless transmission module. The microwave radar sensor comprises a microwave antenna, a high-frequency microwave circuit, an intermediate-frequency circuit electrically connected with the high-frequency microwave circuit, a main control circuit electrically connected with the intermediate-frequency circuit, and a voltage stabilizing circuit electrically connected with the main control circuit and the wireless transmission module, and the intermediate-frequency circuit and the main control circuit are electrically connected with the power supply; the master control circuit is electrically connected with the high-frequency microwave circuit and supplies power to the high-frequency microwave circuit in a pulse mode. The microwave antenna comprises a first antenna, a second antenna and a third antenna which are selected to be electrically connected with the high-frequency microwave circuit, the transmitting frequency of the first antenna is 5.8 Ghz, the transmitting frequency of the second antenna is 10.525 Ghz, and the transmitting frequency of the third antenna is 24 Ghz.

Description

Technical Field

[0001] This utility model relates to the field of radar beacon technology, and in particular to a microwave radar beacon. Background Technology

[0002] To achieve sensor-based control of electrical appliances in a room, sensing modules are often used to detect the activity of people in the room to determine whether anyone has entered or exited. Signals are then sent to the electrical appliances to control their start and stop, achieving energy savings and improving user experience. Currently, the industry mainly uses two methods to detect human activity in a room: infrared sensing and microwave sensing. The former uses pyroelectric infrared sensors to detect infrared radiation, while the latter uses microwave radar modules and the Doppler effect to detect the presence of people or sense moving targets. Infrared sensing has blind spots; the detection signal has insufficient penetration, requiring a high-quality product structure, necessitating openings in the casing, making concealed sensor installation difficult; and the sensor is temperature-sensitive, prone to false triggering at high temperatures, and will fail at temperatures above 37°C, limiting its applicability. Microwave sensing has higher power consumption, a longer motion signal detection range, and difficulty in controlling the sensing range. When the target sensing area is small, it is easily triggered by motion signals outside the target's sensing range, affecting the reliability of the sensing results. Utility Model Content

[0003] Therefore, it is necessary to address the above-mentioned shortcomings by providing a microwave radar beacon with a wide sensing angle and no blind spots, good penetration and concealable installation, strong anti-interference ability, low power consumption, and high controllability of detection range.

[0004] A microwave radar beacon includes a microwave radar sensor, a wireless transmission module electrically connected to the microwave radar sensor and used for communication with a local gateway, and a power supply electrically connected to the microwave radar sensor and the wireless transmission module. The microwave radar sensor includes a microwave antenna, a high-frequency microwave circuit, an intermediate frequency circuit electrically connected to the high-frequency microwave circuit, a main control circuit electrically connected to the intermediate frequency circuit, and a voltage regulator circuit electrically connected to the main control circuit and the wireless transmission module. The intermediate frequency circuit and the main control circuit are electrically connected to the power supply, and the main control circuit is electrically connected to the high-frequency microwave circuit and provides pulse power to the high-frequency microwave circuit. The microwave antenna includes a first antenna, a second antenna, and a third antenna, all electrically connected to the high-frequency microwave circuit. The first antenna has a transmission frequency of 5.8 GHz, the second antenna has a transmission frequency of 10.525 GHz, and the third antenna has a transmission frequency of 24 GHz.

[0005] In one embodiment, the intermediate frequency circuit includes a field-effect transistor electrically connected to a high-frequency microwave circuit, a filter circuit electrically connected to the field-effect transistor, an intermediate frequency signal processor electrically connected to the filter circuit, and a voltage detector electrically connected to the intermediate frequency signal processor.

[0006] In one embodiment, the main control circuit includes a microcontroller electrically connected to an intermediate frequency signal processor, a clock connection circuit electrically connected to the microcontroller and used for outputting clock signals, a MOS field-effect transistor electrically connected to the microcontroller, and a voltage divider circuit electrically connected to the microcontroller and the power supply. The MOS field-effect transistor is electrically connected to a high-frequency microwave circuit.

[0007] In one embodiment, the microcontroller is connected to the intermediate frequency signal processor via a serial port.

[0008] In one embodiment, the pulse period of the main control circuit supplying power to the high-frequency microwave circuit is 5ms, 20ms, 50ms, or 100ms, and the pulse width is 0.1ms or 0.2ms.

[0009] In one embodiment, the wireless transmission module communicates with the local gateway via Bluetooth, Zigbee, or NFC signals.

[0010] In one embodiment, the microwave radar beacon also includes a housing, in which the microwave radar sensor, wireless transmission module, and power supply are all housed.

[0011] In one embodiment, the back of the housing is provided with an adhesive layer, or the housing is provided with lugs for threading screws.

[0012] In one embodiment, the minimum supply voltage of the power supply is 2.9V.

[0013] In one embodiment, the power source is a lithium battery or a dry cell battery.

[0014] The microwave radar beacon of this invention, by incorporating a microwave radar sensor with a sensing range of 3-4 meters, prevents accidental triggering of the sensor by movement outside this range. Its small size and low cost allow for large-scale deployment in desired locations, resulting in high controllability of the detection range. Powered by a main control circuit, the high-frequency microwave circuit has a standby power consumption of only 15-20uA, reducing operating costs. It exhibits strong anti-interference capabilities, unaffected by motion signals from fixed appliances such as fans and exhaust fans, and unaffected by environmental factors such as climate, temperature, humidity, light, and noise. It possesses good signal penetration, capable of penetrating non-metallic materials, and can be concealed during installation. Furthermore, its wide sensing angle and absence of blind spots enhance the reliability of the sensing results. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of a microwave radar beacon in one embodiment of the present invention;

[0016] Figure 2 This is a module connection diagram of a microwave radar beacon in one embodiment of the present invention;

[0017] Figure 3 This is a circuit diagram of a high-frequency microwave circuit in one embodiment of the present invention;

[0018] Figure 4 This is a circuit diagram of the intermediate frequency circuit in one embodiment of the present invention;

[0019] Figure 5 This is a circuit diagram of the main control circuit in one embodiment of the present invention;

[0020] Figure 6 This is a circuit diagram of a voltage regulator circuit in one embodiment of the present invention;

[0021] Figure 7 This is a circuit diagram of the clock connection circuit in one embodiment of the present invention. Detailed Implementation

[0022] To make the above-mentioned objects, features, and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a full understanding of this utility model. However, this utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this utility model. Therefore, this utility model is not limited to the specific embodiments disclosed below.

[0023] Please combine Figure 2-7This utility model discloses a microwave radar beacon with a wide sensing angle and no sensing blind zone, good penetration and concealable installation, strong anti-interference ability, low power consumption and high controllability of detection range. The microwave radar beacon includes a microwave radar sensor 100, a wireless transmission module 200 electrically connected to the microwave radar sensor 100 and used for communication with a local gateway, and a power supply 300 electrically connected to the microwave radar sensor 100 and the wireless transmission module 200. The microwave radar sensor 100 includes a microwave antenna 110, a high-frequency microwave circuit 120, an intermediate frequency circuit 130 electrically connected to the high-frequency microwave circuit 120, a main control circuit 140 electrically connected to the intermediate frequency circuit 130, and a voltage regulator circuit 150 electrically connected to the main control circuit 140 and the wireless transmission module 200. The intermediate frequency circuit 130 and the main control circuit 140 are electrically connected to a power supply 300. The main control circuit 140 is electrically connected to the high-frequency microwave circuit 120 and provides pulse power to the high-frequency microwave circuit 120. The microwave antenna 110 includes a first antenna, a second antenna, and a third antenna, all of which are electrically connected to the high-frequency microwave circuit 120. The first antenna has a transmission frequency of 5.8 GHz, the second antenna has a transmission frequency of 10.525 GHz, and the third antenna has a transmission frequency of 24 GHz. In other words, the microwave radar sensor 100 in this embodiment is actually an ultra-low power 5.8GHz / 10.525GHz / 24GHz microwave module, which uses three antennas with different transmission frequencies to meet the signal detection needs of three different bands. The microwave radar sensor 100 serves as the basic detector for microwave radar beacons, detecting human movement signals within the room. When the microwave radar sensor 100 detects a human movement signal, it sends the signal to the wireless transmission module 200, which then transmits it to the local gateway. The local gateway, connected to the server via Wi-Fi or other technologies, further transmits the signal to the server, which can then calculate whether someone is present in the room based on changes in the triggered beacon points.

[0024] During the operation of the microwave radar beacon, the intermediate frequency circuit 130 and the main control circuit 140 are respectively connected to the power supply voltage. The main control circuit 140 then supplies pulse power to the high-frequency microwave circuit 120. That is, the main control circuit 140 supplies power to the high-frequency microwave circuit 120 through a series of short power pulses. As a result, the high-frequency microwave circuit 120 oscillates and generates an oscillation signal. This oscillation signal is transmitted to the environment in the form of electromagnetic waves through the microwave antenna 110, forming an induction zone in the environment. When a person or object enters the induction zone, the electromagnetic waves reflected by the person or object are received again by the microwave antenna 110, and the signal is fed back to the high-frequency microwave circuit 120, causing the oscillation frequency of the high-frequency microwave circuit 120 to change. This oscillation frequency signal is sent to the intermediate frequency circuit 130, which mixes or converts the high-frequency oscillation frequency signal, converting it into an intermediate frequency signal that is easier to process. At the same time, the intermediate frequency circuit 130 is also used to filter the oscillation frequency signal to remove unwanted frequency components from the oscillation frequency and improve the signal-to-noise ratio of the system. The frequency-converted and filtered signals are further sent to the main control circuit 140. The main control circuit 140 sends an electrical signal to the voltage regulator circuit 150, which further regulates the voltage before transmitting it to the wireless transmission module 200, so that the wireless transmission module 200 can send the signal to the local gateway.

[0025] The high-frequency microwave circuit 120 includes a microcontroller U2 (model SMR580M), a capacitor C18 connected to pin 1 of the microcontroller U2 and connected to the microwave antenna 110, a capacitor C13 and a resistor R12 connected in parallel and both grounded, a capacitor C17 and a resistor R8 connected in parallel to pin 5 of the microcontroller U2, voltage divider resistors R10-11 connected in parallel to pin 7 of the microcontroller U2, a resistor R9 connected in series with the voltage divider resistors R10-11 and pin 7 of the microcontroller U2, and a capacitor C16 connected in parallel with resistor R9 and grounded. Capacitor C13 and resistor R12 are both connected to pins 3 and 4 of the microcontroller U2, and resistor R8 is connected in parallel with resistor R9. The intermediate frequency circuit 130 includes a field-effect transistor electrically connected to the high-frequency microwave circuit 120, a filter circuit electrically connected to the field-effect transistor, an intermediate frequency signal processor electrically connected to the filter circuit, and a voltage detector electrically connected to the intermediate frequency signal processor. Specifically, the intermediate frequency (IF) circuit 130 includes an LR86I IF signal processor U1, a filter circuit consisting of a resistor R1 and a capacitor C8 connected in series and connected to pin 6 of the IF signal processor U1, a field-effect transistor Q2 connected to the filter circuit, and a voltage detector U4 of model SSP61CC1002MR connected to pin 2 of the IF signal processor U1. The IF circuit 130 also includes a voltage divider resistor R2 connected between pin 6 of the IF signal processor U1 and the filter circuit. The field-effect transistor Q2 is used to receive the radio frequency (RF) signals output from pins 3 and 4 of the microcontroller U2 and amplifies these RF signals. The amplified signal is further frequency-converted and filtered by the IF signal processor U1 to output a signal within a preset frequency range. The voltage detector U4 is used to connect to the power supply voltage and detect the power supply voltage. It can be used as a voltage regulator circuit 150 to stabilize the voltage signal transmitted from the power supply 300 to the intermediate frequency signal processor U1. It can also realize overvoltage protection and undervoltage protection for the intermediate frequency signal processor U1 to ensure the stability of the operation of the intermediate frequency signal processor U1.

[0026] In one embodiment, the main control circuit 140 includes a microcontroller electrically connected to the intermediate frequency signal processor, a clock connection circuit electrically connected to the microcontroller and used for outputting clock signals, a MOS field-effect transistor electrically connected to the microcontroller, and a voltage divider circuit electrically connected to the microcontroller and the power supply 300. The MOS field-effect transistor is electrically connected to the high-frequency microwave circuit 120. Preferably, the microcontroller is serially connected to the intermediate frequency signal processor. Specifically, the microcontroller model is FT60F010A-URB (i.e., Figure 5In the circuit diagram, pin 1 of microcontroller U3 is connected to pin 2 (INT / DOC1 pin) of intermediate frequency signal processor U1 so that when the high-frequency microwave circuit 120 outputs an oscillation frequency signal, the intermediate frequency signal processor U1 supplies power to microcontroller U3. Pin 3 of microcontroller U3 is connected to the clock connection circuit and MOSFET Q1 (model AO3401). MOSFET Q1 is connected to pin 7 of microcontroller U2 so that microcontroller U3 supplies power to microcontroller U2 with a series of short power pulses, thereby reducing the overall power consumption of the microwave radar beacon. Pin 4 of microcontroller U3 is connected to pin 3 of intermediate frequency signal processor U1 to receive the signal after frequency conversion and filtering by intermediate frequency signal processor U1. Pin 5 of the microcontroller U3 is connected to a voltage divider circuit. This voltage divider circuit includes capacitors C14-15 connected in parallel and a resistor R5 connected in series with capacitors C14-15. Resistor R5 is connected to the power supply 300. Thus, this voltage divider circuit divides the input power supply voltage to ensure that the voltage in the main control circuit 140 meets the operating voltage of the microcontroller U3. The clock connection circuit includes connector J2, which connects to an external clock and sends a clock signal to the microcontroller U3 to control the operating frequency of the entire microwave radar beacon and the pulse power supply frequency of the microcontroller to the high-frequency microwave circuit 120. The voltage regulator circuit 150 includes a voltage regulator PU1 of model HT7533. By setting the voltage regulator, the voltage signal output by the main control circuit 140 can be stabilized, so that the wireless transmission module 200 can transmit a stable signal to the local gateway.

[0027] In this embodiment, the microwave radar beacon is powered on and initialized for 15 seconds, and detection begins 3 seconds after initialization is complete. Microcontroller U3 is normally in sleep mode. During this process, microcontroller U3 continuously provides power pulses to microcontroller U2. When no one is moving in the room, no oscillation signal is generated in the high-frequency microwave circuit 120, and the OUT output pin of the voltage regulator circuit 150 maintains a TTL / 0V low level. When people move around in the room, the high-frequency microwave circuit 120 outputs an oscillating electrical signal. This oscillating signal is amplified, frequency-converted, and filtered by the intermediate frequency circuit 130. At the same time, the second pin (INT / DOC1) of the intermediate frequency signal processor sends an interrupt signal to the first pin (PA4 / CLKO) of the microcontroller to wake up the microcontroller U3. The microcontroller then further processes the signal sent by the intermediate frequency circuit 130. As a result, the OUT output of the voltage regulator circuit 150 outputs a 1STTL / 3.3V high-level signal. After the input pin of the wireless transmission module 200 detects this high level, it transmits the beacon trigger signal to the local gateway. The local gateway then transmits the signal to the server via WIFI. The server then uses the beacon number in the database to determine which room the person is currently in.

[0028] In one embodiment, the pulse period for the main control circuit 140 to supply power to the high-frequency microwave circuit 120 is 5ms, 20ms, 50ms, or 100ms, and the pulse width is 0.1ms or 0.2ms. That is, the microcontroller U3 supplies a power pulse of 0.1ms or 0.2ms duration to the microcontroller U2 every 5ms, 20ms, 50ms, or 100ms to ensure continuous operation of the high-frequency microwave circuit 120 and reduce the power consumption of the microwave radar beacon. Furthermore, the wireless transmission module 200 communicates with the local gateway via Bluetooth, Zigbee, or NFC signals. Using Bluetooth, Zigbee, or NFC signals to establish the communication connection between the wireless transmission module 200 and the local gateway reduces the power consumption of the wireless transmission module 200, thereby reducing the overall power consumption of the microwave radar beacon.

[0029] Please combine Figure 1 and Figure 2 In one embodiment, the microwave radar beacon further includes a housing 400, within which the microwave radar sensor 100, wireless transmission module 200, and power supply 300 are all housed. Preferably, the back of the housing 400 has an adhesive layer, or the housing 400 has lugs for threading screws. Thus, the entire microwave radar beacon can be fixed to an indoor wall or object surface by adhesive or screw connection, offering high installation flexibility and allowing for numerous placements in various desired locations indoors to achieve full indoor coverage for human motion signal detection.

[0030] In one embodiment, the minimum supply voltage of the power supply 300 is 2.9V. Preferably, in this embodiment, the supply voltage of the power supply 300 is 3.3V. Furthermore, in this embodiment, the power supply 300 is a lithium battery or a dry cell battery, so that the microwave radar beacon can be powered by a built-in battery, which helps to expand its applicable scenarios.

[0031] The microwave radar beacon of this invention, by incorporating a microwave radar sensor 100 with a sensing range of 3-4m, prevents the beacon from being falsely triggered by movement outside this range. Its small size and low cost allow for large-scale deployment in desired locations, resulting in high controllability of the required detection range. The main control circuit 140 provides pulse power to the high-frequency microwave circuit 120, with a standby power consumption of 15-20uA, reducing the cost of using the microwave radar beacon. It exhibits strong anti-interference capabilities, unaffected by motion signals from fixed household appliances such as fans and exhaust fans, and unaffected by environmental factors such as climate, temperature, humidity, light, and noise. It has good signal penetration, capable of penetrating non-metallic materials, and can be concealed during installation. Furthermore, its wide sensing angle and absence of blind spots improve the reliability of the sensing results.

[0032] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0033] 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 the 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 microwave radar beacon, characterized in that, The system includes a microwave radar sensor, a wireless transmission module electrically connected to the microwave radar sensor and used for communication with a local gateway, and a power supply electrically connected to the microwave radar sensor and the wireless transmission module. The microwave radar sensor includes a microwave antenna, a high-frequency microwave circuit, an intermediate frequency circuit electrically connected to the high-frequency microwave circuit, a main control circuit electrically connected to the intermediate frequency circuit, and a voltage regulator circuit electrically connected to the main control circuit and the wireless transmission module. The intermediate frequency circuit and the main control circuit are electrically connected to the power supply, and the main control circuit is electrically connected to the high-frequency microwave circuit and provides pulse power to the high-frequency microwave circuit. The microwave antenna includes a first antenna, a second antenna, and a third antenna, all of which are electrically connected to the high-frequency microwave circuit. The first antenna has a transmission frequency of 5.8 GHz, the second antenna has a transmission frequency of 10.525 GHz, and the third antenna has a transmission frequency of 24 GHz.

2. The microwave radar beacon according to claim 1, characterized in that, The intermediate frequency circuit includes a field-effect transistor electrically connected to the high-frequency microwave circuit, a filter circuit electrically connected to the field-effect transistor, an intermediate frequency signal processor electrically connected to the filter circuit, and a voltage detector electrically connected to the intermediate frequency signal processor.

3. The microwave radar beacon according to claim 2, characterized in that, The main control circuit includes a microcontroller electrically connected to the intermediate frequency signal processor, a clock connection circuit electrically connected to the microcontroller and used for outputting clock signals, a MOS field-effect transistor electrically connected to the microcontroller, and a voltage divider circuit electrically connected to the microcontroller and the power supply. The MOS field-effect transistor is electrically connected to the high-frequency microwave circuit.

4. The microwave radar beacon according to claim 3, characterized in that, The microcontroller is connected to the intermediate frequency signal processor via a serial port.

5. The microwave radar beacon according to claim 1, characterized in that, The pulse period of the main control circuit supplying power to the high-frequency microwave circuit is 5ms, 20ms, 50ms, or 100ms, and the pulse width is 0.1ms or 0.2ms.

6. The microwave radar beacon according to claim 1, characterized in that, The wireless transmission module communicates with the local gateway via Bluetooth, Zigbee, or NFC signals.

7. The microwave radar beacon according to claim 1, characterized in that, The microwave radar beacon also includes a housing, in which the microwave radar sensor, wireless transmission module, and power supply are all housed.

8. The microwave radar beacon according to claim 5, characterized in that, The back of the housing is provided with an adhesive layer, or the housing is provided with lugs for threading screws.

9. The microwave radar beacon according to claim 1, characterized in that, The minimum supply voltage of the power supply is 2.9V.

10. The microwave radar beacon according to claim 1, characterized in that, The power source is a lithium battery or a dry cell battery.

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