Multi-target radar detection circuit

Abstract

The utility model relates to the field of radar detection, in particular to a multi-target radar detection circuit, which comprises a radar radio frequency module, a main control module, a primary operational amplifier module and a secondary operational amplifier module. The control end of the main control module is electrically connected with the radar radio frequency module, the first-stage operational amplifier module and the second-stage operational amplifier module are electrically connected between the radar radio frequency module and the main control module, the main control module outputs a multi-target result and an IF-OUT waveform, two paths of intermediate frequency differential signals are subjected to primary high and low frequency noise clutter filtering by the first-stage operational amplifier module, and two paths of intermediate frequency differential signals are subjected to secondary high and low frequency noise clutter filtering by the second-stage operational amplifier module. And carrying out primary feature reservation amplification on the target signal. The secondary operational amplifier module carries out clutter signal filtering with higher limitation on the output result of the primary operational amplifier module, the operational amplifier U4 amplifies a characteristic waveform signal, and IF-OUT is output to the main control module, so that the main control module outputs waveform characteristics collected by the ADC to observe and adjust multi-target identification parameters and outputs a multi-target identification result with better accuracy.

Description

Technical Field

[0001] The utility model relates to the field of radar detection, in particular to a multi-target radar detection circuit. Background Art

[0002] Radar detection technology is an advanced detection method based on the principle of electromagnetic waves. It measures and locates the distance, speed, direction and other information of the target object by transmitting electromagnetic wave signals and receiving echo signals reflected by the target object. In the radar system, the transmitter generates high-frequency electromagnetic wave signals and radiates them into space through the transmitting antenna. When these signals encounter the target object, a part of them will be reflected back to form an echo signal. The receiving antenna is responsible for receiving these echo signals and transmitting them to the receiver for processing. After signal processing steps such as amplification, filtering, and demodulation, detailed information about the target object can be extracted.

[0003] With the continuous advancement of science and technology, radar detection technology is also developing. New radar systems have higher accuracy, longer detection distance and stronger anti-interference ability. At the same time, with the rapid development of technologies such as autonomous driving, intelligent transportation and the Internet of Things, the application scope of radar detection technology will be further expanded. In the future, radar detection technology will play an important role in more fields and make greater contributions to the development and progress of human society. However, the existing multi-target recognition radars of the same type have poor ability to distinguish adjacent targets, and there are cases of missed detection in practical applications. Utility Model Content

[0004] The utility model aims to provide a multi-target radar detection circuit, aiming to improve the problem that the existing multi-target recognition radar of the same type has poor ability to distinguish adjacent targets and has missed detection in practical applications.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] A multi-target radar detection circuit includes a radar radio frequency module, a main control module, a primary operational amplifier module and a secondary operational amplifier module;

[0007] The first-stage operational amplifier module includes an operational amplifier U4B, a resistor R22, a resistor R23, a resistor R25, a resistor R26, and a capacitor C7, a capacitor C8, a capacitor C16, and a capacitor C23;

[0008] The secondary operational amplifier module includes an operational amplifier U4A, a resistor R24, a resistor R27, and a capacitor C11, a capacitor C21;

[0009] The capacitor C7 and the resistor R22 are connected in series between the first output terminal of the radar RF module and the reverse input terminal of the operational amplifier U4B; the resistor R25 and the capacitor C16 are connected in parallel between the reverse input terminal and the output terminal of the operational amplifier U4B; the capacitor C8 and the resistor R23 are connected in series between the second output terminal of the radar RF module and the non-inverting input terminal of the operational amplifier U4B; the resistor R26 and the capacitor C23 are connected in parallel between the reference voltage VREF1 and the non-inverting input terminal of the operational amplifier U4B;

[0010] The capacitor C11 and the resistor R24 ​​are connected in series between the output terminal of the operational amplifier U4B and the reverse input terminal of the operational amplifier U4A; the resistor R27 and the capacitor C21 are connected in parallel between the reverse input terminal and the output terminal of the operational amplifier U4A; the reference voltage VREF1 is electrically connected to the same-direction input terminal of the operational amplifier U4A; the output terminal of the operational amplifier U4A is electrically connected to the input terminal of the main control module; the power supply terminal of the operational amplifier U4A inputs a 3.3V voltage, and the ground terminal of the operational amplifier U4A is grounded;

[0011] The control end of the main control module is electrically connected to the radar radio frequency module, and the main control module outputs multi-target results and IF-OUT waveforms.

[0012] Furthermore, the radar radio frequency module includes a radio frequency chip RF1, a comparator U7, a resistor R4, a resistor R32, a resistor R40 and a resistor R41.

[0013] Pins 7 and 17 of the radio frequency chip RF1 and pin 5 of the comparator U7 input a 3.3V voltage;

[0014] The resistor R4 is electrically connected between the pin 15 of the RF chip RF1 and one end of the capacitor C7; the resistor R32 is electrically connected between the pin 16 of the RF chip RF1 and one end of the capacitor C8;

[0015] One end of the resistor R40 is electrically connected to pin 9 of the RF chip RF1, and the other end of the resistor R40 is electrically connected to the control end of the main control module; one end of the resistor R41 is electrically connected to pin 10 of the RF chip RF1, and the other end of the resistor R41 is electrically connected to the control end of the main control module, pins 5 and 6 of the RF chip RF1 are electrically connected to the reverse input end and the same direction input end of the comparator U7 respectively, and the output end of the comparator U7 is electrically connected to the main control module;

[0016] Pins 1, 2, 14 and 18 of the radio frequency chip RF1 and pin 2 of the comparator U7 are all grounded.

[0017] Furthermore, the model of the radio frequency chip RF1 is SG24TR12.

[0018] Furthermore, the main control module includes a control chip U6 and resistors R37, R38, R39 and capacitors C37, C38, C39, C40, C41, C42 and C43.

[0019] Pin 14 and pin 15 of the control chip U6 are electrically connected to the other end of the resistor R41 and the other end of the resistor R40 respectively;

[0020] The pin 11 of the control chip U6 is electrically connected to the output end of the operational amplifier U4A;

[0021] One end of the resistor R37 is electrically connected to the pin 20 of the control chip U6; one end of the resistor R38 is electrically connected to the pin 44 of the control chip U6; one end of the resistor R39 is electrically connected to the pin 7 of the control chip U6 and one end of the capacitor C43, the other end of the resistor R39 is connected to a 3.3V voltage, the pin 9 of the control chip U6 is electrically connected to the capacitor C38 and one end of the capacitor C37, the pin 1, pin 24, pin 36 and pin 48 of the control chip U6 are electrically connected to one end of the capacitor C40, capacitor C41, capacitor C42 and capacitor C39 respectively, and a 3.3V voltage is input;

[0022] The other end of the resistor R37, the other end of the resistor R38, the other end of the capacitor C37, the other end of the capacitor C38, the other end of the capacitor C39, the other end of the capacitor C40, the other end of the capacitor C41, the other end of the capacitor C42, and the other end of the capacitor C43 are all grounded.

[0023] Furthermore, the main control module also includes a resistor R45, a capacitor C43, a capacitor C44, a capacitor C45 and a crystal oscillator Y2;

[0024] The two ends of the resistor R45 are electrically connected to the pin 5 and the pin 6 of the control chip U6 respectively, the pin 5 of the control chip U6 is electrically connected to one end of the crystal oscillator Y2 and one end of the capacitor C44; the pin 6 of the control chip U6 is electrically connected to the other end of the crystal oscillator Y2 and one end of the capacitor C45, and the pin 39 of the control chip U6 is electrically connected to the output end of the comparator U7;

[0025] The other end of the capacitor C43, the other end of the capacitor C44, the other end of the capacitor C45, and the pin 2 and the pin 4 of the crystal oscillator Y2 are all grounded.

[0026] Furthermore, the model of the control chip U6 is GD32E103CBT6.

[0027] After adopting the above technical solution, the utility model has the following advantages compared with the background technology:

[0028] The built-in DAC module of the main control chip generates the VT1 center voltage and VT2 waveform voltage at a certain periodic interval, and the radar RF module generates the modulation signal. After the modulation signal is sent, the radar RF module receives the echo signal and outputs two intermediate frequency differential signals IF1-P and IF1-N. The two intermediate frequency differential signals are preliminarily filtered by the first-level op amp module for high and low frequency noise and clutter, and the target signal is amplified once for feature preservation. The output result of the operational amplifier U4B enters the second-level op amp module through the capacitor C11. The second-level op amp module filters the output result of the first-level op amp module with higher restrictions on the clutter signal, and the operational amplifier U4 amplifies the characteristic waveform signal and outputs IF-OUT to the main control module, so that the main control module can output the waveform characteristics collected by the ADC for observation and adjustment of multi-target recognition parameters, and output multi-target recognition results with better accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 This is a module block diagram of the multi-target radar detection circuit of the utility model;

[0030] Figure 2 This is a circuit diagram of a main control module of the multi-target radar detection circuit of the utility model;

[0031] Figure 3 A radar radio frequency module circuit diagram of the multi-target radar detection circuit of the utility model;

[0032] Figure 4 It is a circuit diagram of a primary operational amplifier module and a secondary operational amplifier module of the multi-target radar detection circuit of the utility model;

[0033] Figure 5 The circuit diagram of the primary operational amplifier unit and the secondary operational amplifier unit of the multi-target radar detection circuit of the utility model;

[0034] Figure 6 It is a circuit diagram of the comparator U7 of the multi-target radar detection circuit of the utility model. DETAILED DESCRIPTION

[0035] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0036] In addition, it should be noted that the terms "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc. are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element of the present invention must have a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0037] When an element is referred to as being “fixed to” or “disposed on” or “provided on” another element, it may be directly on the other element or indirectly on the other element. When an element is referred to as being “connected to” another element, it may be directly connected to the other element or indirectly connected to the other element.

[0038] Unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the utility model can be understood according to specific circumstances.

[0039] Example

[0040] Please refer to Figure 1-6 As shown, this embodiment provides a multi-target radar detection circuit, including a radar radio frequency module, a main control module, a primary operational amplifier module and a secondary operational amplifier module. Figure 4 As shown, the first-stage operational amplifier module includes an operational amplifier U4B, resistors R22, R23, R25, R26, and capacitors C7, C8, C16, and C23. The second-stage operational amplifier module includes an operational amplifier U4A, resistors R24, R27, and capacitors C11 and C21.

[0041] Capacitor C7 and resistor R22 are connected in series between the first output terminal of the radar RF module and the reverse input terminal of the operational amplifier U4B; resistor R25 and capacitor C16 are connected in parallel between the reverse input terminal and the output terminal of the operational amplifier U4B; capacitor C8 and resistor R23 are connected in series between the second output terminal of the radar RF module and the same-direction input terminal of the operational amplifier U4B; resistor R26 and capacitor C23 are connected in parallel between the reference voltage VREF1 and the same-direction input terminal of the operational amplifier U4B. Among them, capacitor C7 and resistor R22 as well as capacitor C8 and resistor R23 form a high-pass filter circuit, and resistor R25 and capacitor C16 form a low-pass filter circuit to filter high and low frequency noise and clutter. Resistor R26 and capacitor C23 form a VREF bias voltage circuit to ensure the working performance of the operational amplifier U4B.

[0042] Capacitor C11 and resistor R24 ​​are connected in series between the output end of operational amplifier U4B and the reverse input end of operational amplifier U4A; resistor R27 and capacitor C21 are connected in parallel between the reverse input end and the output end of operational amplifier U4A; reference voltage VREF1 is electrically connected to the same-direction input end of operational amplifier U4A; the output end of operational amplifier U4A is electrically connected to the input end of the main control module; the power supply end of operational amplifier U4A inputs 3.3V voltage, and the ground end of operational amplifier U4A is grounded. Capacitor C11 and resistor R24 ​​as well as resistor R27 and capacitor C21 form a bandpass filter circuit to filter the noise signal of the output result of operational amplifier U4B.

[0043] The first op amp module and the second op amp module form the first op amp module, which also includes the second op amp module. The second op amp module includes the first op amp unit and the second op amp unit. Figure 5 As shown, the first-stage operational amplifier unit includes an operational amplifier U4C, resistors R6, R7, R9, R10, and capacitors C6, C9, C14, and C24. The second-stage operational amplifier unit includes an operational amplifier U4D, resistors R8, R11, and capacitors C10 and C12.

[0044] Capacitor C6 and resistor R6 are connected in series between the third output terminal of the radar RF module and the reverse input terminal of the operational amplifier U4C; resistor R9 and capacitor C24 are connected in parallel between the reverse input terminal and the output terminal of the operational amplifier U4C; capacitor C9 and resistor R7 are connected in series between the fourth output terminal of the radar RF module and the same-direction input terminal of the operational amplifier U4C; resistor R10 and capacitor C14 are connected in parallel between the reference voltage VREF2 and the same-direction input terminal of the operational amplifier U4C. Among them, capacitor C6 and resistor R6 as well as capacitor C9 and resistor R7 form a high-pass filter circuit, and resistor R9 and capacitor C24 form a low-pass filter circuit to filter high and low frequency noise and clutter. Resistor R10 and capacitor C14 form a VREF bias voltage circuit to ensure the working performance of the operational amplifier U4C.

[0045] Capacitor C10 and resistor R8 are connected in series between the output end of operational amplifier U4C and the reverse input end of operational amplifier U4D; resistor R11 and capacitor C12 are connected in parallel between the reverse input end and the output end of operational amplifier U4D; reference voltage VREF2 is electrically connected to the same-direction input end of operational amplifier U4D; the output end of operational amplifier U4D is electrically connected to the input end of the main control module. The power supply end of operational amplifier U4D inputs 3.3V voltage, and the ground end of operational amplifier U4D is grounded. Capacitor C10 and resistor R8 as well as resistor R11 and capacitor C12 form a bandpass filter circuit to filter the noise signal of the output result of operational amplifier U4D.

[0046] The control end of the main control module is electrically connected to the radar RF module, and the main control module outputs multi-target results and IF-OUT waveforms. The built-in DAC module of the main control chip generates the VT1 center voltage and VT2 waveform voltage at a certain periodic interval, and the radar RF module generates the modulation signal. After the modulation signal is sent, the radar RF module receives two intermediate frequency echo signals and outputs two intermediate frequency differential signals IF1-P and IF1-N and IF2-P and IF2-N respectively. The two intermediate frequency differential signals are respectively filtered by the first-stage op amp module and the first-stage op amp unit for preliminary high and low frequency noise and clutter filtering, and the target signal is amplified once with feature retention. The output results of operational amplifier U4B and operational amplifier U4C enter the secondary operational amplifier module and the secondary operational amplifier unit through capacitor C11 and capacitor C10 respectively. The secondary operational amplifier module and the secondary operational amplifier unit respectively filter the output results of the primary operational amplifier module and the primary operational amplifier unit with higher restrictions on the clutter signals. The characteristic waveform signals are amplified by operational amplifier U4A and operational amplifier U4D respectively, and IF1-OUT and IF2-OUT are output to the main control module, so that the main control module can output the waveform characteristics collected by ADC for observing and adjusting the multi-target recognition parameters, and output multi-target recognition results with better accuracy.

[0047] Please refer to Figure 3 and Figure 6 As shown, specifically, the radar RF module includes an RF chip RF1, a comparator U7, a resistor R4, a resistor R29, a resistor R36, a resistor R32, a resistor R40 and a resistor R41, and pins 7 and 17 of the RF chip RF1 and pin 5 of the comparator U7 input a 3.3V voltage.

[0048] Resistor R4 is electrically connected between pin 15 of RF chip RF1 and one end of capacitor C7; resistor R32 is electrically connected between pin 16 of RF chip RF1 and one end of capacitor C8. Resistor R29 is electrically connected between pin 13 of RF chip RF1 and one end of capacitor C6; resistor R36 is electrically connected between pin 12 of RF chip RF1 and one end of capacitor C9. One end of resistor R40 is electrically connected to pin 9 of RF chip RF1, and the other end of resistor R40 is electrically connected to the control end of the main control module. One end of resistor R41 is electrically connected to pin 10 of RF chip RF1, and the other end of resistor R41 is electrically connected to the control end of the main control module. Pin 5 and pin 6 of RF chip RF1 are electrically connected to the reverse input end and the same direction input end of comparator U7 respectively, and the output end of comparator U7 is electrically connected to the main control module.

[0049] Pins 1, 2, 14 and 18 of the radio frequency chip RF1 and pin 2 of the comparator U7 are all grounded. In this embodiment, the model of the radio frequency chip RF1 is SG24TR12.

[0050] Please refer to Figure 2 As shown, specifically, the main control module includes a control chip U6 and resistors R37, R38, R39 and capacitors C37, C38, C39, C40, C41, C42 and C43. Pins 14 and 15 of the control chip U6 are electrically connected to the other end of the resistor R41 and the other end of the resistor R40, respectively.

[0051] Pin 11 of the control chip U6 is electrically connected to the output end of the operational amplifier U4A, and pin 18 of the control chip U6 is electrically connected to the output end of the operational amplifier U4D. One end of the resistor R37 is electrically connected to pin 20 of the control chip U6. One end of the resistor R38 is electrically connected to pin 44 of the control chip U6. One end of the resistor R39 is electrically connected to pin 7 of the control chip U6 and one end of the capacitor C43, and the other end of the resistor R39 is connected to a 3.3V voltage. Pin 9 of the control chip U6 is electrically connected to one end of the capacitor C38 and the capacitor C37. Pin 1, pin 24, pin 36 and pin 48 of the control chip U6 are electrically connected to one end of the capacitor C40, capacitor C41, capacitor C42 and capacitor C39, respectively, and input a 3.3V voltage.

[0052] The other end of resistor R37, the other end of resistor R38, the other end of capacitor C37, the other end of capacitor C38, the other end of capacitor C39, the other end of capacitor C40, the other end of capacitor C41, the other end of capacitor C42, and the other end of capacitor C43 are all grounded.

[0053] Specifically, the main control module also includes a resistor R45, a capacitor C44, a capacitor C45 and a crystal oscillator Y2. The two ends of the resistor R45 are electrically connected to the pin 5 and the pin 6 of the control chip U6 respectively, and the pin 5 of the control chip U6 is electrically connected to one end of the crystal oscillator Y2 and one end of the capacitor C44. The pin 6 of the control chip U6 is electrically connected to the other end of the crystal oscillator Y2 and one end of the capacitor C45. The other end of the capacitor C44, the other end of the capacitor C45 and the pin 2 and pin 4 of the crystal oscillator Y2 are all grounded. The pin 39 of the control chip U6 is electrically connected to the output end of the comparator U7, and the pin 30 and the pin 31 of the control chip U6 are electrically connected to the external host computer. The main control chip U6 outputs an ADC waveform or a multi-target result through the pin 30, and the control chip U6 receives the control signal sent by the host computer through the pin 31. The pin 34 and the pin 37 of the control chip U6 are electrically connected to the external burner for burning the program. Specifically, the model of the control chip U6 is GD32E103CBT6.

[0054] Specifically, the signal modulation unit includes a resistor R44, one end of which is electrically connected to the other end of the resistor R41, and the other end of the resistor R44 is electrically connected to the other end of the resistor R40 and the pin 15 of the control chip U6. The resistor R44 plays a role in modifying the adjustable bandwidth range of the modulation signal generated by the radio frequency chip RF1.

[0055] The above is only a preferred specific implementation of the utility model, but the protection scope of the utility model is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the utility model should be included in the protection scope of the utility model. Therefore, the protection scope of the utility model should be based on the protection scope of the claims.

Claims

1. A multi-target radar detection circuit, characterized in that: Including radar RF module, main control module, primary operational amplifier module and secondary operational amplifier module; The first-stage operational amplifier module includes an operational amplifier U4B, a resistor R22, a resistor R23, a resistor R25, a resistor R26, and a capacitor C7, a capacitor C8, a capacitor C16, and a capacitor C23; The secondary operational amplifier module includes an operational amplifier U4A, a resistor R24, a resistor R27, and a capacitor C11, a capacitor C21; The capacitor C7 and the resistor R22 are connected in series between the first output terminal of the radar RF module and the reverse input terminal of the operational amplifier U4B; the resistor R25 and the capacitor C16 are connected in parallel between the reverse input terminal and the output terminal of the operational amplifier U4B; the capacitor C8 and the resistor R23 are connected in series between the second output terminal of the radar RF module and the non-inverting input terminal of the operational amplifier U4B; the resistor R26 and the capacitor C23 are connected in parallel between the reference voltage VREF1 and the non-inverting input terminal of the operational amplifier U4B; The capacitor C11 and the resistor R24 ​​are connected in series between the output terminal of the operational amplifier U4B and the reverse input terminal of the operational amplifier U4A; the resistor R27 and the capacitor C21 are connected in parallel between the reverse input terminal and the output terminal of the operational amplifier U4A; the reference voltage VREF1 is electrically connected to the same-direction input terminal of the operational amplifier U4A; the output terminal of the operational amplifier U4A is electrically connected to the input terminal of the main control module; the power supply terminal of the operational amplifier U4A inputs a 3.3V voltage, and the ground terminal of the operational amplifier U4A is grounded; The control end of the main control module is electrically connected to the radar radio frequency module, and the main control module outputs multi-target results and IF-OUT waveforms.

2. The multi-target radar detection circuit according to claim 1, characterized in that: The radar radio frequency module includes a radio frequency chip RF1, a comparator U7, a resistor R4, a resistor R32, a resistor R40 and a resistor R41. Pins 7 and 17 of the radio frequency chip RF1 and pin 5 of the comparator U7 input a 3.3V voltage; The resistor R4 is electrically connected between the pin 15 of the RF chip RF1 and one end of the capacitor C7; the resistor R32 is electrically connected between the pin 16 of the RF chip RF1 and one end of the capacitor C8; One end of the resistor R40 is electrically connected to pin 9 of the RF chip RF1, and the other end of the resistor R40 is electrically connected to the control end of the main control module; one end of the resistor R41 is electrically connected to pin 10 of the RF chip RF1, and the other end of the resistor R41 is electrically connected to the control end of the main control module, pins 5 and 6 of the RF chip RF1 are electrically connected to the reverse input end and the same direction input end of the comparator U7 respectively, and the output end of the comparator U7 is electrically connected to the main control module; Pins 1, 2, 14 and 18 of the radio frequency chip RF1 and pin 2 of the comparator U7 are all grounded.

3. The multi-target radar detection circuit according to claim 2, characterized in that: The model of the radio frequency chip RF1 is SG24TR12.

4. The multi-target radar detection circuit according to claim 2, characterized in that: The main control module includes a control chip U6 and resistors R37, R38, R39 and capacitors C37, C38, C39, C40, C41, C42 and C43. Pin 14 and pin 15 of the control chip U6 are electrically connected to the other end of the resistor R41 and the other end of the resistor R40 respectively; The pin 11 of the control chip U6 is electrically connected to the output end of the operational amplifier U4A; One end of the resistor R37 is electrically connected to the pin 20 of the control chip U6; one end of the resistor R38 is electrically connected to the pin 44 of the control chip U6; one end of the resistor R39 is electrically connected to the pin 7 of the control chip U6 and one end of the capacitor C43, the other end of the resistor R39 is connected to a 3.3V voltage, the pin 9 of the control chip U6 is electrically connected to the capacitor C38 and one end of the capacitor C37, the pin 1, pin 24, pin 36 and pin 48 of the control chip U6 are electrically connected to one end of the capacitor C40, capacitor C41, capacitor C42 and capacitor C39 respectively, and a 3.3V voltage is input; The other end of the resistor R37, the other end of the resistor R38, the other end of the capacitor C37, the other end of the capacitor C38, the other end of the capacitor C39, the other end of the capacitor C40, the other end of the capacitor C41, the other end of the capacitor C42, and the other end of the capacitor C43 are all grounded.

5. The multi-target radar detection circuit according to claim 4, characterized in that: The main control module also includes a resistor R45, a capacitor C43, a capacitor C44, a capacitor C45 and a crystal oscillator Y2; The two ends of the resistor R45 are electrically connected to the pin 5 and the pin 6 of the control chip U6 respectively, the pin 5 of the control chip U6 is electrically connected to one end of the crystal oscillator Y2 and one end of the capacitor C44; the pin 6 of the control chip U6 is electrically connected to the other end of the crystal oscillator Y2 and one end of the capacitor C45, and the pin 39 of the control chip U6 is electrically connected to the output end of the comparator U7; The other end of the capacitor C43, the other end of the capacitor C44, the other end of the capacitor C45, and the pin 2 and the pin 4 of the crystal oscillator Y2 are all grounded.

6. The multi-target radar detection circuit according to claim 4, characterized in that: The model of the control chip U6 is GD32E103CBT6.

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