A single-chip microcomputer-based automatic radio frequency signal receiving device
By using modular design and multi-stage low-noise amplification and filtering technology, combined with a microcontroller-controlled automatic radio frequency signal receiving device, the shortcomings of existing devices in frequency switching and modulation mode identification are solved, and automatic reception of radio frequency signals with high sensitivity and strong anti-interference is achieved.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- NANJING VOCATIONAL UNIV OF IND TECH
- Filing Date
- 2025-11-07
- Publication Date
- 2026-07-21
AI Technical Summary
Existing radio frequency receiving devices lack flexible frequency switching and modulation mode identification functions, have insufficient sensitivity and poor anti-interference capabilities, and are unable to meet the requirements for rapid acquisition and demodulation of wide-band, low signal-to-noise ratio signals in complex electromagnetic environments.
It adopts a modular design, including an RF input module, a front-end amplification and filtering module, a power divider and demodulation module, a programmable amplifier module, a three-way module, a microcontroller, and an RF output module. It is controlled by an STM32F429 microcontroller, combined with an FM demodulator NE564 and an AM envelope detector demodulator LTC5507 for multi-standard identification, and improves the receiving performance through multi-stage low-noise amplification and bandpass filtering.
It achieves multi-standard recognition capability for radio frequency signals, improves receiving sensitivity and anti-interference capability, and supports rapid reception and processing of portable multi-standard radio frequency signals.
Smart Images
Figure CN224538187U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to a radio frequency signal receiving device, and more particularly to a radio frequency signal automatic receiving device based on a microcontroller. Background Technology
[0002] This section provides only background information relevant to this disclosure and is not necessarily prior art.
[0003] Most common radio frequency receiving devices are designed with a single fixed frequency band, lacking flexible frequency switching and modulation mode identification functions. Furthermore, the front-end signal chain generally suffers from insufficient sensitivity, poor anti-interference, and weak expansion capabilities, making it difficult to meet the requirements for rapid acquisition, identification, and demodulation of wide-band, low signal-to-noise ratio signals in complex electromagnetic environments.
[0004] For example, traditional tuning receivers often require manual selection of frequency and demodulation mode, and cannot automatically identify the signal type (such as AM or FM) after power-on. This results in low efficiency and high error rate in multi-signal environments. Therefore, there is an urgent need for an automatic radio frequency signal receiving device with a modular structure, support for multi-standard recognition, programmable control, and high sensitivity.
[0005] It should be noted that the information disclosed in the background section above is only used to enhance the understanding of the background of this disclosure, and therefore may include information that does not constitute prior art known to those skilled in the art. Utility Model Content
[0006] Purpose of the invention: The technical problem to be solved by this utility model is to provide an automatic radio frequency signal receiving device based on a single-chip microcomputer, which addresses the shortcomings of the existing technology.
[0007] To address the aforementioned technical problems, this utility model discloses an automatic radio frequency signal receiving device based on a microcontroller, comprising:
[0008] The system includes an RF input module, a front-end amplification and filtering module, a power divider and demodulation module, a programmable amplifier module, a three-way module, a microcontroller, and an RF output module; among which,
[0009] The front-end amplification and filtering module receives external radio frequency signals through the radio frequency input module, and after amplification and noise filtering, sends them to the power divider and demodulation module.
[0010] The power divider and demodulation module splits the signal into two paths and modulates them separately to obtain the first demodulated signal and the second demodulated signal;
[0011] The first demodulated signal and the second demodulated signal are respectively sent to the microcontroller and the RF output module through the programmable amplifier module and the three-way module;
[0012] The microcontroller obtains a control signal based on the input signal, and the radio frequency output module selects different signals to output based on the control signal.
[0013] Furthermore, the aforementioned front-end amplification and filtering module includes:
[0014] A first low-noise amplifier, a second low-noise amplifier, and a bandpass filter are connected in series.
[0015] Furthermore, the power divider and demodulation module includes:
[0016] A power divider splits the filtered signal from the front end into two paths, where...
[0017] After being mixed with the local oscillator signal by a mixer, the signal is filtered by an intermediate frequency filter and then connected to an FM demodulator for demodulation to obtain the first demodulated signal.
[0018] The other path is demodulated by an AM envelope detector and demodulator to obtain a second demodulated signal.
[0019] Furthermore, the programmable amplifier module includes:
[0020] The first programmable amplifier and the second programmable amplifier are used to adjust the amplitudes of the first demodulated signal and the second demodulated signal, respectively.
[0021] Furthermore, the aforementioned three-way module includes:
[0022] The first tee module and the second tee module; among which...
[0023] The input terminal of the first three-way module is connected to the first demodulated signal, and the output terminal is connected to the microcontroller and the RF output module respectively;
[0024] The input terminal of the second three-way module is connected to the second demodulated signal, and the output terminal is connected to the microcontroller and the RF output module, respectively.
[0025] Furthermore, the microcontroller used is an STM32F429 microcontroller, which is used to calculate the control signal based on the first demodulated signal and the second demodulated signal.
[0026] Furthermore, the radio frequency output module includes:
[0027] RF switches, power amplifiers, and SMA output ports; among which,
[0028] The radio frequency switch receives the first demodulated signal and the second demodulated signal output by the first three-way module and the second three-way module respectively, as well as the control signal of the microcontroller, and selects to output one of the first demodulated signal and the second demodulated signal according to the control signal.
[0029] The power amplifier and SMA output port are connected in series with the RF switch to amplify and output the signal from the RF switch output terminal.
[0030] Furthermore, the device also includes:
[0031] The local oscillator signal source connected to the mixer input is used to output the local oscillator signal.
[0032] Furthermore, the local oscillator signal source is connected to the microcontroller signal source, and outputs the local oscillator signal according to the control signal issued by the microcontroller.
[0033] Furthermore, the device also includes:
[0034] The display module, which is connected to the microcontroller via signals, is used to display information.
[0035] Beneficial effects:
[0036] 1. This utility model has the ability to recognize multiple standards of radio frequency signals by demodulating the input radio frequency signal using an FM demodulator NE564 and an AM envelope detector demodulator LTC5507 respectively.
[0037] 2. This utility model improves receiving sensitivity and anti-interference capability through multi-stage low-noise amplification and bandpass filtering.
[0038] 3. The device adopts a modular design, supports hardware-level expansion, and is suitable for the rapid reception and processing of portable multi-standard radio frequency signals. Attached Figure Description
[0039] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments, and the advantages of the present invention in the above and / or other aspects will become clearer.
[0040] Figure 1 This is a schematic diagram of the specific structure of this utility model.
[0041] Figure 2 This is a schematic diagram of the principle of this utility model. Detailed Implementation
[0042] This utility model provides a microcontroller-based automatic radio frequency signal receiving device, which realizes automatic identification, demodulation, and output of wide-band radio frequency signals, such as... Figure 2 As shown, it includes:
[0043] RF input module 1: includes SMA input port 11, used to receive external RF signals.
[0044] Front-end amplification and filtering module 2 includes a first low-noise amplifier 21 (LNA), a second low-noise amplifier 22, and an 88 MHz–108 MHz bandpass filter 23 connected in series, used to enhance signal amplitude and suppress out-of-band noise.
[0045] Power divider and demodulation module 3: includes a power divider 30, which splits the front-end filtered signal into two paths:
[0046] After being mixed by mixer 311 (ADE-1) and local oscillator signal source 312 (ADF4351), the signal is filtered by 10.7 MHz intermediate frequency filter 313 and then connected to FM demodulator 314 (NE564) for demodulation to obtain the first demodulated signal 31;
[0047] Another path is demodulated by AM envelope detector demodulator 321 (LTC5507) to obtain the second demodulated signal 32.
[0048] Programmable amplifier module 4: Both demodulated signals are adjusted in amplitude by programmable amplifiers 41 and 42 (VCA810) and then input to the main control module through RF three-way devices 81 and 82 respectively;
[0049] Main control module: Uses STM32F429 microcontroller to receive two demodulated signals, perform amplitude / envelope feature analysis on the two signals, and realize automatic AM / FM mode recognition;
[0050] The STM32F429 microcontroller is also used to control the local oscillator frequency of the local oscillator signal source 312 (ADF4351);
[0051] The STM32F429 microcontroller 5 is also used to control the RF switch 61 to switch the RF path, that is, to use the first demodulated signal 31 as the output or the second demodulated signal 32 as the output.
[0052] RF output module 6: includes RF switch 61, power amplifier 62 (AIP8002) and SMA output port 63;
[0053] Display module 7: includes an OLED screen 71, used to display information such as signal frequency, mode and amplitude;
[0054] Three-way module 8: includes RF three-way switches 81 and 82, used to distribute or synthesize signals to each module. RF three-way switch 81 has a first demodulated signal 31 as input and its outputs connected to STM32F429 microcontroller 5 and RF switch 61, respectively. RF three-way switch 82 has a second demodulated signal 32 as input and its outputs connected to STM32F429 microcontroller 5 and RF switch 61, respectively.
[0055] Example:
[0056] like Figure 1 As shown, this utility model provides an automatic radio frequency signal receiving device based on a microcontroller, comprising:
[0057] SMA female input 1: This is the input interface for radio frequency signals, used to connect an external antenna to receive radio frequency signals.
[0058] The first-stage LNA amplifier module TQP3M9037 21 amplifies weak input RF signals with low noise, improving signal amplitude and signal-to-noise ratio.
[0059] The second-stage LNA amplifier module TQP3M90372 22 amplifies the initially amplified signal again to meet the input level requirements of subsequent processing modules.
[0060] 88 MHz–108 MHz bandpass filter 23: Performs bandpass filtering on the signal to filter out interference signals outside the operating frequency band and retain only the target frequency band signal.
[0061] ADP-1-2 power divider 30: splits the RF signal into two, one path goes into the AM demodulation branch, and the other path goes into the mixer branch.
[0062] LTC5507 AM Demodulator 321: Performs envelope detection on radio frequency signals to achieve demodulated output of AM modulated signals.
[0063] VCA810 Programmable Amplifier 4: Performs programmable gain amplification on the AM demodulated signal, with the gain adjusted by the main control microcontroller to adapt to different signal strengths.
[0064] ADE-1 Mixer 311: Mixes one radio frequency signal from the power divider with the local oscillator signal to output an intermediate frequency signal.
[0065] 10.7 MHz bandpass filter 9: Filters the intermediate frequency signal of the mixer output to obtain a clean intermediate frequency carrier.
[0066] Three-way 8: As a signal switching and combining module, it is used to switch and transmit demodulated or intermediate frequency signals to subsequent processing channels.
[0067] NE564 FM Demodulator 314: Performs frequency discrimination processing on intermediate frequency signals to achieve demodulated output of FM modulated signals.
[0068] ADF4351 Local Oscillator Signal Source 312: Outputs an adjustable frequency local oscillator signal under the control of the main control microcontroller, which is used by the mixer to generate the required intermediate frequency signal.
[0069] VCA810 Programmable Amplifier 4: Used for gain control amplification of the FM demodulated signal, which is adjusted by the main control microcontroller.
[0070] RF switch 61: Used to control the on / off state of RF signals, enabling the selection and isolation of input signal paths.
[0071] AIP8002 Power Amplifier 62: Amplifies the processed output signal to meet the needs of subsequent load driving or transmission.
[0072] Three-way 82: As a signal combiner module, it combines the outputs of different signal paths and sends them to the output terminal.
[0073] SMA female output 63: Serves as the signal output interface of the device, used to output processed radio frequency or baseband signals.
[0074] The STM32F429 microcontroller 18 serves as the core control unit of the system, responsible for the timing control, gain control, local oscillator frequency setting, demodulation mode switching, and data processing of the entire device.
[0075] OLED display 71: Displays real-time information such as the device's operating status and signal type identification results.
[0076] The main control microcontroller 5 outputs control signals to modules such as programmable amplifiers 41 and 42, local oscillator signal source 312, and RF switch 61 to adjust the gain, set the local oscillator frequency, and control the signal path. At the same time, it collects demodulated signals from AM demodulator 321 and FM demodulator 314, identifies the modulation mode and processes the demodulated data, and finally outputs the demodulated signal through output interface 63 and displays the current demodulated signal type through OLED display screen 71.
[0077] This device achieves automatic identification and demodulation reception of input RF signals through multi-stage amplification, filtering, splitting, mixing, demodulation, gain control, and main intelligent control. It features modular structure and intelligent control.
[0078] This utility model provides a concept and method for an automatic radio frequency signal receiving device based on a microcontroller. Many methods and approaches exist for implementing this technical solution; the above description is merely a preferred embodiment of this utility model. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principle of this utility model, and these improvements and modifications should also be considered within the scope of protection of this utility model. All components not explicitly stated in this embodiment can be implemented using existing technology.
Claims
1. A microcontroller-based automatic radio frequency signal receiving device, characterized in that, include: The system comprises an RF input module (1), a front-end amplification and filtering module (2), a power divider and demodulation module (3), a programmable amplifier module (4), a three-way communication module (8), a microcontroller (5), and an RF output module (6); among which, The front-end amplification and filtering module (2) receives external radio frequency signals through the radio frequency input module (1), and after amplification and noise filtering, sends them to the power divider and demodulation module (3). The power divider and demodulation module (3) divides the signal into two paths and modulates them respectively to obtain the first demodulated signal (31) and the second demodulated signal (32). The first demodulated signal (31) and the second demodulated signal (32) are sent to the microcontroller (5) and the radio frequency output module (6) respectively through the programmable amplifier module (4) and the three-way module (8); The microcontroller (5) obtains a control signal based on the input signal, and the radio frequency output module (6) selects different signals to output based on the control signal.
2. The automatic radio frequency signal receiving device based on a microcontroller according to claim 1, characterized in that, The aforementioned front-end amplification and filtering module (2) includes: A first low-noise amplifier (21), a second low-noise amplifier (22), and a bandpass filter (23) are connected in series.
3. The automatic radio frequency signal receiving device based on a microcontroller according to claim 2, characterized in that, The power divider and demodulation module (3) includes: The power divider (30) splits the filtered signal from the front end into two paths, where, After being mixed with the local oscillator signal by the mixer (311), the signal is filtered by the intermediate frequency filter (313) and then connected to the FM demodulator (314) for demodulation to obtain the first demodulated signal (31). Another path is demodulated by AM envelope detector (321) to obtain the second demodulated signal (32).
4. The microcontroller-based automatic radio frequency signal receiving device according to claim 3, characterized in that, The programmable amplifier module (4) includes: The first programmable amplifier (41) and the second programmable amplifier (42) are used to adjust the amplitudes of the first demodulated signal (31) and the second demodulated signal (32), respectively.
5. The automatic radio frequency signal receiving device based on a microcontroller according to claim 4, characterized in that, The three-way module (8) includes: The first tee module (81) and the second tee module (82); among which, The input terminal of the first three-way module (81) is connected to the first demodulated signal (31), and the output terminal is connected to the microcontroller (5) and the radio frequency output module (6) respectively. The input terminal of the second three-way module (82) is connected to the second demodulated signal (32), and the output terminal is connected to the microcontroller (5) and the radio frequency output module (6) respectively.
6. The automatic radio frequency signal receiving device based on a microcontroller according to claim 5, characterized in that, The microcontroller (5) is an STM32F429 microcontroller, used to calculate the control signal based on the first demodulated signal (31) and the second demodulated signal (32).
7. The automatic radio frequency signal receiving device based on a microcontroller according to claim 6, characterized in that, The radio frequency output module (6) includes: RF switch (61), power amplifier (62), and SMA output port (63); among which, The radio frequency switch (61) receives the first demodulated signal (31) and the second demodulated signal (32) output by the first three-way module (81) and the second three-way module (82) respectively, as well as the control signal of the microcontroller (5), and selects to output one of the first demodulated signal (31) and the second demodulated signal (32) according to the control signal. The power amplifier (62) and SMA output port (63) are connected in series with the radio frequency switch (61) to amplify and output the signal at the output terminal of the radio frequency switch (61).
8. The automatic radio frequency signal receiving device based on a microcontroller according to claim 7, characterized in that, The device further includes: The local oscillator signal source (312) connected to the input terminal of the mixer (311) is used to output the local oscillator signal.
9. The automatic radio frequency signal receiving device based on a microcontroller according to claim 8, characterized in that, The local oscillator signal source (312) is connected to the microcontroller (5) and outputs the local oscillator signal according to the control signal issued by the microcontroller (5).
10. The automatic radio frequency signal receiving device based on a microcontroller according to claim 9, characterized in that, The device further includes: The display module (7) is connected to the microcontroller (5) via signals and is used to display information.