Terminal device for frequency detection of airborne communication equipment of civil aircraft

By designing a terminal device that includes a main control module, peak detection module, analog switch module, signal amplification module, shaping module and gate module, the problems of large size and complex operation of traditional equipment are solved, efficient and accurate frequency detection is achieved, and the operating frequency and voltage differences of different communication equipment are adapted to meet the high reliability requirements of modern aircraft.

CN223364141UActive Publication Date: 2025-09-19BEIJING AVIC YICHENG TECH CO LTD
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Patent Information

Application Number
CN202422136894.9
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2024-09-02
Publication Date
2025-09-19
Estimated Expiration
2034-09-02

AI Technical Summary

Technical Problem

The frequency detection equipment used in existing civil aircraft onboard communication equipment is large in size and complex to operate, and cannot meet the high reliability and compatibility requirements of modern aircraft. In addition, traditional equipment cannot adapt to the differences in operating frequency and voltage of different communication equipment.

Method used

A terminal device including a main control module, a peak detection module, an analog switch module, a signal amplification module, a shaping module and a gate module was designed. A single-chip microcomputer with an analog-to-digital conversion function was used to control the analog switch module to select the appropriate amplification factor, and the signal was converted into a square wave through the shaping module, and the signal frequency was calculated in combination with the gate module.

Benefits of technology

It achieves efficient and accurate detection of aircraft communication equipment frequencies in a limited space, improves the compatibility and practicality of the equipment, and meets the high reliability requirements of modern aircraft for communication equipment.

✦ Generated by Eureka AI based on patent content.

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Patent Text Reader

Abstract

The utility model relates to the technical field of frequency detection, in particular to a terminal device for frequency detection of airborne communication equipment of a civil aircraft, which comprises a main control module, a peak detection module, an analog switch module, a signal amplification module, a shaping module and a gate module. The main control module controls the analog switch module according to the detected signal amplitude so as to determine the amplification factor of the signal amplification module, the control end of the analog switch module is connected with the output pin of the single chip microcomputer, and the output ends of the shaping module and the gate module are respectively connected with different input pins of the single chip microcomputer. According to the utility model, the peak value detection module detects the peak value of the signal to be detected, and then the analog switch module selects a proper amplification factor, so that the amplified signal can better meet the subsequent detection requirement after subsequent shaping, and the practicability is stronger.
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Description

Technical Field

[0001] The utility model relates to the technical field of frequency detection, in particular to a terminal device for frequency detection of onboard communication equipment of a civil aircraft. Background Art

[0002] With the rapid development of civil aviation, the safe operation of civil aircraft is of vital importance. During the operation of civil aircraft, onboard communication equipment plays a key role in communication and information transmission. These communication devices need to operate within a specific frequency range to ensure accurate and stable communication with ground control centers, other aircraft, and satellites.

[0003] Currently, frequency detection of civil aircraft's onboard communication equipment mainly relies on traditional detection methods and equipment; however, these existing methods have some shortcomings. On the one hand, traditional detection equipment is often large in size and complex to operate, making it inconvenient for rapid deployment and use on aircraft; within the limited aircraft space, large detection equipment may take up too much valuable space, affecting the aircraft's load and layout; on the other hand, the accuracy and real-time performance of traditional detection equipment may not meet the high reliability requirements of modern civil aviation for communication equipment.

[0004] In addition, with the continuous advancement of avionics technology, the complexity and integration of airborne communication equipment are becoming increasingly higher; this requires that frequency detection devices be able to adapt to different types of communication equipment and have strong compatibility and versatility. Different communication equipment requires different operating frequencies and voltages. In order to meet the requirements of civil aircraft for frequency detection of airborne communication equipment, a new type of terminal device is urgently needed to solve the problems existing in the existing technology. Utility Model Content

[0005] The purpose of the present utility model is to provide a terminal device for frequency detection of onboard communication equipment of a civil aircraft, so as to solve the problem in the above background technology that different communication equipment require different operating frequency voltages.

[0006] To achieve the above objectives, the present invention provides the following technical solutions:

[0007] A terminal device for frequency detection of onboard communication equipment on a civil aircraft comprises a main control module, further comprising: a peak detection module, an analog switch module, a signal amplification module, a shaping module, and a gate module. The main control module uses a single-chip microcomputer with an analog-to-digital conversion function. The output end of the peak detection module is connected to an input pin of the single-chip microcomputer. The peak detection module is used to detect signal amplitude. The main control module controls the analog switch module based on the detected signal amplitude to thereby determine the amplification factor of the signal amplification module. The control end of the analog switch module is connected to an output pin of the single-chip microcomputer. The analog switch module, the signal amplification module, and the shaping module are electrically connected in sequence. The output ends of the shaping module and the gate module are respectively connected to different input pins of the single-chip microcomputer.

[0008] Preferably, the peak detection module includes an operational amplifier U1, a resistor R1, a resistor R2, a diode D1, a resistor R3, a diode D2, a capacitor C1, an operational amplifier U2, a resistor R4, a transistor Q, a resistor R5 and a resistor R6;

[0009] The non-inverting input terminal of the operational amplifier U1 receives the test signal, the first terminal of the resistor R1 is connected to the inverting input terminal of the operational amplifier U1, the second terminal of the resistor R1 is connected to the output terminal of the operational amplifier U1, the first terminal of the resistor R2 is connected to the output terminal of the operational amplifier U1, the second terminal of the resistor R2 is connected to the anode of the diode D1, the cathode of the diode D1 is grounded, the first terminal of the resistor R3 is connected to the second terminal of the resistor R2, the second terminal of the resistor R3 is connected to the +5V power supply, the anode of the diode D2 is connected to the output terminal of the operational amplifier U1, the cathode of the diode D2 is connected to the first terminal of the capacitor C1, and the second terminal of the capacitor C1 is connected to the ground. The first end is connected to the ground, the first end of the capacitor C1 is also connected to the non-inverting input terminal of the operational amplifier U2, the first end of the resistor R4 is connected to the inverting input terminal of the operational amplifier U2, the second end of the resistor R4 is connected to the output terminal of the operational amplifier U2, the output terminal of the operational amplifier U2 serves as the output terminal of the peak detection module, the base of the transistor Q is connected to the first end of the resistor R5, the second end of the resistor R5 is connected to the output pin of the single-chip microcomputer, the first end of the resistor R6 is connected to the base of the transistor Q, the second end of the resistor R6 is grounded, the collector of the transistor Q is connected to the first end of the capacitor C1, and the emitter of the transistor Q is grounded.

[0010] Preferably, the analog switch module uses a CD4052 chip, the address selection pin and enable pin of the CD4052 chip are respectively connected to different output pins of the microcontroller, one input pin of the CD4052 chip receives a test signal, and the three corresponding output pins of the CD4052 chip serve as different output ends of the analog switch module.

[0011] Preferably, the signal amplification module includes a resistor R7, an operational amplifier U3, a resistor R8, a resistor R9, a resistor R10, a resistor R11, an operational amplifier U4, a resistor R12, a resistor R13, a resistor R14, an operational amplifier U5, a resistor R15, a resistor R16, a resistor R17 and an operational amplifier U6;

[0012] The first ends of the resistor R7, the resistor R11 and the resistor R14 are respectively connected to different output ends of the analog switch module, and the output ends of the operational amplifier U3, the operational amplifier U4 and the operational amplifier U6 serve as the output end of the signal amplification module;

[0013] The second end of the resistor R7 is connected to the non-inverting input terminal of the operational amplifier U3, the first end of the resistor R8 is connected to the inverting input terminal of the operational amplifier U3, and the second end of the resistor R8 is connected to the output terminal of the operational amplifier U3;

[0014] The second end of the resistor R11 is connected to the non-inverting input terminal of the operational amplifier U4, the first end of the resistor R9 is grounded, the second end of the resistor R9 is connected to the inverting input terminal of the operational amplifier U4, the first end of the resistor R10 is connected to the inverting input terminal of the operational amplifier U4, and the second end of the resistor R10 is connected to the output terminal of the operational amplifier U4;

[0015] The second end of resistor R14 is connected to the non-inverting input terminal of the operational amplifier U5, the first end of resistor R12 is grounded, the second end of resistor R12 is connected to the inverting input terminal of the operational amplifier U5, the first end of resistor R13 is connected to the inverting input terminal of the operational amplifier U5, the second end of resistor R13 is connected to the output terminal of the operational amplifier U5, the output terminal of the operational amplifier U5 is connected to the first end of resistor R17, the second end of resistor R17 is connected to the non-inverting input terminal of the operational amplifier U6, the first end of resistor R15 is grounded, the second end of resistor R15 is connected to the inverting input terminal of the operational amplifier U6, the first end of resistor R16 is connected to the inverting input terminal of the operational amplifier U6, and the second end of resistor R16 is connected to the output terminal of the operational amplifier U6.

[0016] Preferably, the shaping module includes a resistor R18, a diode D3, a diode D4, an operational amplifier U7, a resistor R19, a diode D5 and a diode D6;

[0017] The first end of the resistor R18 is connected to the output end of the signal amplification module, the second end of the resistor R18 is connected to the inverting input end of the operational amplifier U7, the non-inverting input end of the operational amplifier U7 is grounded, the output end of the operational amplifier U7 is connected to the first end of the resistor R19, and the second end of the resistor R19 serves as the output end of the shaping module;

[0018] The anode of diode D3 is connected to the inverting input terminal of operational amplifier U7, the cathode of diode D3 is connected to the non-inverting input terminal of operational amplifier U7, the anode of diode D4 is connected to the non-inverting input terminal of operational amplifier U7, and the cathode of diode D4 is connected to the inverting input terminal of operational amplifier U7;

[0019] The cathode of the diode D5 is connected to the second end of the resistor R19, the anode of the diode D5 is connected to the anode of the diode D6, and the cathode of the diode D6 is grounded.

[0020] Preferably, the gate module includes capacitor C2, capacitor C3, crystal oscillator Y, resistor R20, CD4060 chip and CD4518 chip;

[0021] The first end of capacitor C2 is grounded, the second end of capacitor C2 is connected to the first end of crystal oscillator Y, the first end of capacitor C3 is grounded, the second end of capacitor C3 is connected to the second end of crystal oscillator Y, the first end of resistor R20 is connected to the first end of crystal oscillator Y, the second end of resistor R20 is connected to the second end of crystal oscillator Y, the two ends of crystal oscillator Y are respectively connected to the input pins of CD4060 chip, the Q14 output pin of CD4060 chip is connected to the input pin of CD4518 chip, and the Q1 output pin of CD4518 chip serves as the output end of the gate module.

[0022] Preferably, it further comprises a display module, and the display module is signal-connected to the main control module.

[0023] Compared with the prior art, the beneficial effects of the present invention are:

[0024] The utility model detects the peak value of the signal to be tested by setting a peak detection module, and then selects the appropriate amplification factor through the analog switch module, so that the amplified signal can better meet the subsequent detection requirements after subsequent shaping, and is more practical. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0026] Figure 2 This is a circuit diagram of the peak detection module in the utility model;

[0027] Figure 3 It is a circuit diagram of the analog switch module in the utility model;

[0028] Figure 4 This is a circuit diagram of the signal amplification module in the utility model;

[0029] Figure 5 This is a circuit diagram of the shaping module in the utility model;

[0030] Figure 6 This is the circuit diagram of the gate module in the utility model;

[0031] In the picture:

[0032] 1. Main control module;

[0033] 2. Peak detection module;

[0034] 3. Analog switch module;

[0035] 4. Signal amplification module;

[0036] 5. Shaping module;

[0037] 6. Gate module;

[0038] 7. Display module. DETAILED DESCRIPTION

[0039] The following is a clear and complete description of the technical solutions of the present invention in conjunction with the accompanying drawings. Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0040] See also Figures 1-6 , this utility model provides a technical solution:

[0041] A terminal device for frequency detection of onboard communication equipment of a civil aircraft comprises a main control module 1, further comprising: a peak detection module 2, an analog switch module 3, a signal amplification module 4, a shaping module 5, and a gate module 6. The main control module 1 uses a single-chip microcomputer with an analog-to-digital conversion function. The output end of the peak detection module 2 is connected to an input pin of the single-chip microcomputer. The peak detection module 2 is used to detect signal amplitude. The main control module 1 controls the analog switch module 3 based on the detected signal amplitude to thereby determine the amplification factor of the signal amplification module 4. The control end of the analog switch module 3 is connected to an output pin of the single-chip microcomputer. The analog switch module 3, the signal amplification module 4, and the shaping module 5 are electrically connected in sequence. The output ends of the shaping module 5 and the gate module 6 are respectively connected to different input pins of the single-chip microcomputer. The amplification factor is determined based on the peak detection module 2, thereby improving detection accuracy and enhancing practicality.

[0042] In this embodiment, the peak detection module 2 includes an operational amplifier U1, a resistor R1, a resistor R2, a diode D1, a resistor R3, a diode D2, a capacitor C1, an operational amplifier U2, a resistor R4, a transistor Q, a resistor R5, and a resistor R6;

[0043] The non-inverting input terminal of the operational amplifier U1 receives the test signal, the first terminal of the resistor R1 is connected to the inverting input terminal of the operational amplifier U1, the second terminal of the resistor R1 is connected to the output terminal of the operational amplifier U1, the first terminal of the resistor R2 is connected to the output terminal of the operational amplifier U1, the second terminal of the resistor R2 is connected to the anode of the diode D1, the cathode of the diode D1 is grounded, the first terminal of the resistor R3 is connected to the second terminal of the resistor R2, the second terminal of the resistor R3 is connected to the +5V power supply, the anode of the diode D2 is connected to the output terminal of the operational amplifier U1, the cathode of the diode D2 is connected to the first terminal of the capacitor C1, and the cathode of the capacitor C1 is connected to the ground. The two terminals are grounded, the first terminal of the capacitor C1 is also connected to the non-inverting input terminal of the operational amplifier U2, the first terminal of the resistor R4 is connected to the inverting input terminal of the operational amplifier U2, the second terminal of the resistor R4 is connected to the output terminal of the operational amplifier U2, the output terminal of the operational amplifier U2 serves as the output terminal of the peak detection module 2, the base of the transistor Q is connected to the first terminal of the resistor R5, the second terminal of the resistor R5 is connected to the output pin of the single-chip computer, the first terminal of the resistor R6 is connected to the base of the transistor Q, the second terminal of the resistor R6 is grounded, the collector of the transistor Q is connected to the first terminal of the capacitor C1, and the emitter of the transistor Q is grounded;

[0044] Diode D2 and capacitor C1 form a detection circuit. Diode D2 is unidirectionally conductive. The signal to be measured will continuously charge capacitor C1 until it reaches a peak value. Diode D1 is always on to compensate for the voltage drop of diode D2. After the detection is completed, transistor Q is turned on to release the charge of capacitor C1.

[0045] Specifically, the analog switch module 3 uses the CD4052 chip. The address selection pin and enable pin of the CD4052 chip are respectively connected to different output pins of the microcontroller. One input pin of the CD4052 chip receives the test signal. The three corresponding output pins of the CD4052 chip serve as different output ends of the analog switch module 3. The address selection pin is used to control the internal switch to be closed, thereby controlling the subsequent amplification factor to meet subsequent detection requirements.

[0046] Furthermore, the signal amplification module 4 includes a resistor R7, an operational amplifier U3, a resistor R8, a resistor R9, a resistor R10, a resistor R11, an operational amplifier U4, a resistor R12, a resistor R13, a resistor R14, an operational amplifier U5, a resistor R15, a resistor R16, a resistor R17 and an operational amplifier U6;

[0047] The first ends of the resistors R7, R11 and R14 are connected to different output ends of the analog switch module 3 respectively, and the output ends of the operational amplifiers U3, U4 and U6 serve as the output end of the signal amplification module 4;

[0048] The second end of the resistor R7 is connected to the non-inverting input terminal of the operational amplifier U3, the first end of the resistor R8 is connected to the inverting input terminal of the operational amplifier U3, and the second end of the resistor R8 is connected to the output terminal of the operational amplifier U3. The operational amplifier U3 is a voltage follower with an amplification factor of 1, which can output the signal to be measured with a larger voltage as is;

[0049] The second end of the resistor R11 is connected to the non-inverting input terminal of the operational amplifier U4, the first end of the resistor R9 is grounded, the second end of the resistor R9 is connected to the inverting input terminal of the operational amplifier U4, the first end of the resistor R10 is connected to the inverting input terminal of the operational amplifier U4, and the second end of the resistor R10 is connected to the output terminal of the operational amplifier U4. The operational amplifier U4 constitutes a first-stage amplifier, which can amplify and output a medium-voltage signal to be measured;

[0050] The second end of resistor R14 is connected to the non-inverting input terminal of operational amplifier U5, the first end of resistor R12 is grounded, the second end of resistor R12 is connected to the inverting input terminal of operational amplifier U5, the first end of resistor R13 is connected to the inverting input terminal of operational amplifier U5, the second end of resistor R13 is connected to the output terminal of operational amplifier U5, the output terminal of operational amplifier U5 is connected to the first end of resistor R17, the second end of resistor R17 is connected to the non-inverting input terminal of operational amplifier U6, the first end of resistor R15 is grounded, the second end of resistor R15 is connected to the inverting input terminal of operational amplifier U6, the first end of resistor R16 is connected to the inverting input terminal of operational amplifier U6, the second end of resistor R16 is connected to the output terminal of operational amplifier U6, the operational amplifier U5 and the operational amplifier U6 constitute a two-stage amplifier, which can amplify the measured signal with a smaller voltage twice and then output it.

[0051] It is worth noting that the shaping module 5 includes a resistor R18, a diode D3, a diode D4, an operational amplifier U7, a resistor R19, a diode D5 and a diode D6;

[0052] The first end of the resistor R18 is connected to the output end of the signal amplification module 4, the second end of the resistor R18 is connected to the inverting input end of the operational amplifier U7, the non-inverting input end of the operational amplifier U7 is grounded, the output end of the operational amplifier U7 is connected to the first end of the resistor R19, the second end of the resistor R19 serves as the output end of the shaping module 5, and the operational amplifier U7 is a zero-crossing comparator that converts the signal processed by the signal amplification module 4 into a square wave;

[0053] The anode of diode D3 is connected to the inverting input terminal of operational amplifier U7, the cathode of diode D3 is connected to the non-inverting input terminal of operational amplifier U7, the anode of diode D4 is connected to the non-inverting input terminal of operational amplifier U7, the cathode of diode D4 is connected to the inverting input terminal of operational amplifier U7, and diode D3 and diode D4 form a diode limiter circuit to prevent the differential mode signal from being too large;

[0054] The cathode of diode D5 is connected to the second end of resistor R19, the anode of diode D5 is connected to the anode of diode D6, the cathode of diode D6 is grounded, and diode D5 and diode D6 form a voltage regulator limiting circuit to limit the output signal.

[0055] It is worth noting that the gate module 6 includes capacitor C2, capacitor C3, crystal oscillator Y, resistor R20, CD4060 chip and CD4518 chip;

[0056] The first end of capacitor C2 is grounded, the second end of capacitor C2 is connected to the first end of crystal oscillator Y, the first end of capacitor C3 is grounded, the second end of capacitor C3 is connected to the second end of crystal oscillator Y, the first end of resistor R20 is connected to the first end of crystal oscillator Y, the second end of resistor R20 is connected to the second end of crystal oscillator Y, the two ends of crystal oscillator Y are respectively connected to the input pins of CD4060 chip, the Q14 output pin of CD4060 chip is connected to the input pin of CD4518 chip, the Q1 output pin of CD4518 chip serves as the output end of gate module 6, CD4060 chip and CD4518 chip are both common frequency dividers, the frequency of crystal oscillator Y is 32768HZ, the output signal frequency of Q14 output pin of CD4060 chip is 2HZ, the output signal frequency of Q1 output pin of CD4518 chip is 1HZ, and gate module 6 generates a gate signal of 1s.

[0057] Finally, a display module 7 is also included. The display module 7 is connected to the main control module 1 by signal and can use a common LCD display screen.

[0058] When the terminal device for frequency detection of airborne communication equipment on a civil aircraft of the present invention is used, the peak detection module 2 first detects the peak value of the signal to be measured, and then the main control module 1 controls the switch in the analog switch module 3, thereby controlling the amplification factor of the signal amplification module 4. The signal amplification module 4 has three amplification factors, and different amplification factors are selected according to the peak value of the signal to be measured. Then, the signal is converted into a square wave by the shaping module 5, and the gate module 6 provides a 1HZ square wave signal. The main control module 1 calculates the frequency of the signal by counting the number of signal pulses within a known time gate, and finally displays it through the display module 7. In addition, the internal settings of the main control module 1 can also be changed by pressing buttons.

[0059] The above shows and describes the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are merely preferred examples of the present invention and are not intended to limit the present invention. Various changes and improvements may be made to the present invention without departing from the spirit and scope of the present invention, and such changes and improvements fall within the scope of the present invention. The scope of protection claimed in the present invention is defined by the appended claims and their equivalents.

Claims

1. A terminal device for frequency detection of onboard communication equipment of a civil aircraft, comprising a main control module (1), characterized in that: The system further comprises: a peak detection module (2), an analog switch module (3), a signal amplification module (4), a shaping module (5) and a gate module (6); the main control module (1) uses a single chip microcomputer with an analog-to-digital conversion function; the output end of the peak detection module (2) is connected to the input pin of the single chip microcomputer; the peak detection module (2) is used to detect the signal amplitude; the main control module (1) controls the analog switch module (3) according to the detected signal amplitude and thereby determines the amplification factor of the signal amplification module (4); the control end of the analog switch module (3) is connected to the output pin of the single chip microcomputer; the analog switch module (3), the signal amplification module (4) and the shaping module (5) are electrically connected in sequence; the output ends of the shaping module (5) and the gate module (6) are respectively connected to different input pins of the single chip microcomputer.

2. The terminal device for frequency detection of onboard communication equipment of a civil aircraft according to claim 1, characterized in that: The peak detection module (2) includes an operational amplifier U1, a resistor R1, a resistor R2, a diode D1, a resistor R3, a diode D2, a capacitor C1, an operational amplifier U2, a resistor R4, a transistor Q, a resistor R5 and a resistor R6; The non-inverting input terminal of the operational amplifier U1 receives the test signal, the first terminal of the resistor R1 is connected to the inverting input terminal of the operational amplifier U1, the second terminal of the resistor R1 is connected to the output terminal of the operational amplifier U1, the first terminal of the resistor R2 is connected to the output terminal of the operational amplifier U1, the second terminal of the resistor R2 is connected to the anode of the diode D1, the cathode of the diode D1 is grounded, the first terminal of the resistor R3 is connected to the second terminal of the resistor R2, the second terminal of the resistor R3 is connected to the +5V power supply, the anode of the diode D2 is connected to the output terminal of the operational amplifier U1, the cathode of the diode D2 is connected to the first terminal of the capacitor C1, and the second terminal of the capacitor C1 Grounded, the first end of the capacitor C1 is also connected to the non-inverting input terminal of the operational amplifier U2, the first end of the resistor R4 is connected to the inverting input terminal of the operational amplifier U2, the second end of the resistor R4 is connected to the output terminal of the operational amplifier U2, the output terminal of the operational amplifier U2 serves as the output terminal of the peak detection module (2), the base of the transistor Q is connected to the first end of the resistor R5, the second end of the resistor R5 is connected to the output pin of the single chip computer, the first end of the resistor R6 is connected to the base of the transistor Q, the second end of the resistor R6 is grounded, the collector of the transistor Q is connected to the first end of the capacitor C1, and the emitter of the transistor Q is grounded.

3. The terminal device for frequency detection of onboard communication equipment of a civil aircraft according to claim 1, characterized in that: The analog switch module (3) uses a CD4052 chip, the address selection pin and the enable pin of the CD4052 chip are respectively connected to different output pins of the single chip microcomputer, one input pin of the CD4052 chip receives a test signal, and the three corresponding output pins of the CD4052 chip serve as different output ends of the analog switch module (3).

4. The terminal device for frequency detection of onboard communication equipment of a civil aircraft according to claim 1, characterized in that: The signal amplification module (4) includes a resistor R7, an operational amplifier U3, a resistor R8, a resistor R9, a resistor R10, a resistor R11, an operational amplifier U4, a resistor R12, a resistor R13, a resistor R14, an operational amplifier U5, a resistor R15, a resistor R16, a resistor R17 and an operational amplifier U6; The first ends of the resistor R7, the resistor R11 and the resistor R14 are respectively connected to different output ends of the analog switch module (3), and the output ends of the operational amplifier U3, the operational amplifier U4 and the operational amplifier U6 serve together as the output end of the signal amplification module (4); The second end of the resistor R7 is connected to the non-inverting input terminal of the operational amplifier U3, the first end of the resistor R8 is connected to the inverting input terminal of the operational amplifier U3, and the second end of the resistor R8 is connected to the output terminal of the operational amplifier U3; The second end of the resistor R11 is connected to the non-inverting input terminal of the operational amplifier U4, the first end of the resistor R9 is grounded, the second end of the resistor R9 is connected to the inverting input terminal of the operational amplifier U4, the first end of the resistor R10 is connected to the inverting input terminal of the operational amplifier U4, and the second end of the resistor R10 is connected to the output terminal of the operational amplifier U4; The second end of resistor R14 is connected to the non-inverting input terminal of the operational amplifier U5, the first end of resistor R12 is grounded, the second end of resistor R12 is connected to the inverting input terminal of the operational amplifier U5, the first end of resistor R13 is connected to the inverting input terminal of the operational amplifier U5, the second end of resistor R13 is connected to the output terminal of the operational amplifier U5, the output terminal of the operational amplifier U5 is connected to the first end of resistor R17, the second end of resistor R17 is connected to the non-inverting input terminal of the operational amplifier U6, the first end of resistor R15 is grounded, the second end of resistor R15 is connected to the inverting input terminal of the operational amplifier U6, the first end of resistor R16 is connected to the inverting input terminal of the operational amplifier U6, and the second end of resistor R16 is connected to the output terminal of the operational amplifier U6.

5. The terminal device for frequency detection of onboard communication equipment of a civil aircraft according to claim 1, characterized in that: The shaping module (5) includes a resistor R18, a diode D3, a diode D4, an operational amplifier U7, a resistor R19, a diode D5 and a diode D6; The first end of the resistor R18 is connected to the output end of the signal amplification module (4), the second end of the resistor R18 is connected to the inverting input end of the operational amplifier U7, the non-inverting input end of the operational amplifier U7 is grounded, the output end of the operational amplifier U7 is connected to the first end of the resistor R19, and the second end of the resistor R19 serves as the output end of the shaping module (5); The anode of diode D3 is connected to the inverting input terminal of operational amplifier U7, the cathode of diode D3 is connected to the non-inverting input terminal of operational amplifier U7, the anode of diode D4 is connected to the non-inverting input terminal of operational amplifier U7, and the cathode of diode D4 is connected to the inverting input terminal of operational amplifier U7; The cathode of the diode D5 is connected to the second end of the resistor R19, the anode of the diode D5 is connected to the anode of the diode D6, and the cathode of the diode D6 is grounded.

6. The terminal device for frequency detection of onboard communication equipment of a civil aircraft according to claim 1, characterized in that: The gate module (6) includes a capacitor C2, a capacitor C3, a crystal oscillator Y, a resistor R20, a CD4060 chip and a CD4518 chip; The first end of the capacitor C2 is grounded, the second end of the capacitor C2 is connected to the first end of the crystal oscillator Y, the first end of the capacitor C3 is grounded, the second end of the capacitor C3 is connected to the second end of the crystal oscillator Y, the first end of the resistor R20 is connected to the first end of the crystal oscillator Y, the second end of the resistor R20 is connected to the second end of the crystal oscillator Y, the two ends of the crystal oscillator Y are respectively connected to the input pins of the CD4060 chip, the Q14 output pin of the CD4060 chip is connected to the input pin of the CD4518 chip, and the Q1 output pin of the CD4518 chip serves as the output end of the gate module (6).

7. The terminal device for frequency detection of onboard communication equipment of a civil aircraft according to claim 1, characterized in that: It also includes a display module (7), and the display module (7) is signal-connected to the main control module (1).