CN212749231U

CN212749231U - Radar signal detection circuit

Info

Publication number: CN212749231U
Application number: CN202021195664.5U
Authority: CN
Inventors: 张扬; 张丽; 段荣; 李玉成; 姚永康; 张沐群; 王楠
Original assignee: Air Force Engineering University of PLA Aircraft Maintenace Management Sergeant School
Current assignee: Air Force Engineering University of PLA Aircraft Maintenace Management Sergeant School
Priority date: 2020-06-24
Filing date: 2020-06-24
Publication date: 2021-03-19
Anticipated expiration: 2030-06-24

Abstract

The utility model discloses a radar signal detection circuitry, including radar detecter, controller, radar detecter transmits the radar signal that detects to the controller, and the effectual radar signal of having solved exists because of the signal that self is weak and other frequencies, and influences the problem of the degree of accuracy when the controller carries out the analysis to radar signal. The utility model discloses at first utilize the amplification follower circuit to amplify the signal that radar detector detected and export in the tune output circuit, the tune output circuit then selects the radar signal in the signal and exports the controller, amplify the signal and utilize the tune output circuit to select the radar signal through the amplification follower circuit, it is weak unfavorable for tune output circuit to select the radar signal to have avoided the signal, the controller has also been avoided the controller to have the signal of other frequencies to exist and form the emergence of the problem of interference when carrying out the analysis to the received radar signal, the degree of accuracy of controller to radar signal analysis has been improved.

Description

Radar signal detection circuit

Technical Field

The utility model relates to a signal detection field, especially a radar signal detection circuitry.

Background

The radar plays different roles in modern life and plays irreplaceable roles, for example, the radar is used as a weather radar for detecting the latest weather information for people to forecast the real-time weather condition for people, and is used as a navigation radar for providing the most accurate positioning for vehicles, ships and airplanes, and the like, thereby providing great convenience for the work and life of people.

However, in the prior art, when a radar detector is used for detecting a radar signal transmitted from a distance, the radar signal is attenuated and weakened because the radar signal is shielded by the environment such as a wall in the transmission process; when the radar detector transmits the radar signal to the controller for analysis, signals of other frequencies exist, and the signals of other frequencies are interference relative to the radar signal, so that the accuracy of the radar signal analysis by the controller is influenced.

Therefore, the utility model provides a new scheme to solve the problem.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a radar signal detection circuitry, the effectual radar signal that has solved influences the problem of the degree of accuracy when the controller carries out the analysis to radar signal because of the signal existence of self weak and other frequencies.

The technical scheme who solves is, a radar signal detection circuitry, including radar detecter, controller, radar detecter transmits the radar signal that detects to the controller, still pass through enlarged following circuit, tuned output circuit in proper order between radar detecter and the controller, enlarged following circuit includes amplifier and follower, and the radar signal that radar detecter detected passes through amplifier and follower in proper order and then transmits tuned output circuit.

The utility model discloses a following beneficial effect:

(1) the field-effect tube Q1, the triode Q2 and the triode Q3 in the amplification following circuit are used for carrying out voltage amplification and current amplification on the signal detected by the radar detector U1, so that the problem that the signal detected by the radar detector is weak due to attenuation in the transmission process and the radar signal selected from the signal by a rear-stage circuit is influenced is solved;

(2) the frequency of the radar signal is selected and amplified by using the tuning output circuit taking the triode Q4, the capacitor C5, the variable capacitor C6 and the inductor L1 as cores, so that the problem that the radar signal is interfered by signals of other frequencies when the controller analyzes the received radar signal is solved, and the accuracy of the controller in analyzing the radar signal is improved.

Drawings

Fig. 1 is a schematic diagram of an amplifying follower circuit in the circuit of the present invention.

Fig. 2 is a schematic diagram of a tuned output circuit in the circuit of the present invention.

Detailed Description

The foregoing and other technical and scientific aspects, features and advantages of the present invention will be apparent from the following detailed description of the embodiments, which is to be read in connection with the accompanying drawings of fig. 1-2. The structural contents mentioned in the following embodiments are all referred to the attached drawings of the specification.

Exemplary embodiments of the present invention will be described below with reference to the accompanying drawings.

A radar signal detection circuit is applied between controllers of radar detectors, a radar detector U1 detects radar signals by a microwave radar sensor with the model number of HB-100, an amplification follower circuit firstly processes the signals detected by the radar detector U1, an amplifier composed of a field effect tube Q1 is used for amplifying the voltage of the signals, the signals are coupled to a follower composed of a triode Q2 and a triode Q3 as cores through a capacitor C2, the current of the signals is amplified, the capability of the signals for driving a tuning output circuit is also improved, the signals are transmitted to the tuning output circuit, the amplified signals are received through a diode D3, radar signals with the frequency of 10.52GHz are selected through the capacitor C5, the capacitor C6, a resistor R7 and the inductor L1, signals with other frequencies are filtered, and the radar signals with the frequency of 10.52GHz are amplified again through the triode Q4, the capacitor C8 is coupled to the controller for the controller to analyze the radar signal, the signal detected by the radar detector U1 is amplified through the amplifying following circuit, the radar signal is selected and amplified through the tuning output circuit taking the triode Q4 as the core, and interference of signals of other frequencies to the radar signal is avoided;

the amplification follower circuit processes signals detected by a radar detector U1, in order to avoid the signals from being too weak, an amplifier taking a field effect tube Q1 as a core is used for amplifying the detected signals, the field effect tube Q1 has the characteristic of low noise, and the influence on the signals caused by the noise of an electronic device is also reduced, a resistor R1 is used for realizing impedance matching between the radar detector U1 and the amplifier and avoiding the interference on the signals caused by impedance mismatching, in order to avoid the interference of the ripple waves in the voltage provided by a positive power supply VCC for the field effect tube Q1, a triode Q2 and the triode Q3, a capacitor C1 is used for filtering the ripple waves in the voltage, a resistor R1, a resistor R3 and a resistor R4 are respectively a gate resistor, a drain resistor and a source resistor of the field effect tube Q1 and are used for protecting three pins of the field effect tube Q1, and a common-gate amplification circuit is formed by the field effect tube Q1, according to the characteristic that the common-gate amplifying circuit only amplifies voltage, a signal amplified by the field effect transistor Q1 is coupled to a follower through a capacitor C2, a push-pull type follower consisting of a triode Q2 and a triode Q3 is arranged to amplify current of the signal detected by the radar detector U1, a diode D1 and a diode D2 are used as bias diodes of a triode Q2 and a triode Q3, conducting voltage of the diode is utilized to offset conducting voltage drop of a VBE of the triode Q2 and the triode Q3 so as to prevent cross distortion caused by simultaneous cut-off of the triode Q2 and the triode Q3 when the triode Q2 and the triode Q353542 are alternately conducted, a resistor R5 and a resistor R6 respectively provide base voltage for the triode Q3 and the triode Q2, a resistor R8 is a collector resistor of the triode Q3, the signal output by the follower is coupled to a tuning output circuit through the capacitor C3 and comprises a resistor R1, one end of the resistor R1 is connected with a pin 1 of the, a pin 2 of the radar detector U1 is respectively connected with one end of a resistor R2, one end of a resistor R4, one end of a resistor R5 and one end of a resistor R8 and is connected with ground, the other end of a resistor R1 is respectively connected with a source of a field effect transistor Q1 and the other end of a resistor R4, a gate of a field effect transistor Q1 is connected with the other end of a resistor R2, a drain of a field effect transistor Q1 is respectively connected with one end of a resistor R3 and one end of a capacitor C2, the other end of the resistor R2 is respectively connected with one end of the capacitor C2, one end of the resistor R2 and a collector of the transistor Q2, the other end of the capacitor C2 is connected with ground, the other end of the resistor R2 is respectively connected with a base of the transistor Q2 and an anode of the diode D2, a cathode of the diode D2 is respectively connected with an anode of the diode D2 and the other end of the capacitor C2, a cathode of the diode D2 is respectively connected with the, an emitter of the triode Q2 is respectively connected with one end of the capacitor C3 and an emitter of the triode Q3, an amplifier is composed of the triode Q1, a resistor R2, a resistor R3 and a resistor R4, and a follower is composed of the triode Q2, the triode Q3, a resistor R6, a resistor R8, a diode D1, a diode D2 and a resistor R5;

the tuning output circuit receives a signal coupled by the amplifying follower circuit through a capacitor C3 through a diode D3, and transmits the signal to a base electrode of a triode Q4, meanwhile, the diode D3 also prevents the signal from reversely flowing back to the amplifying follower circuit, a resonant circuit consisting of the capacitor C5, the capacitor C6, a resistor R7 and an inductor L1 is used for selecting a radar signal of 10.52GHz, so that signals of other frequencies are prevented from entering a controller, and further the analysis of the radar signal by the controller is influenced, the frequency selected by the resonant circuit is adjusted by using a variable capacitor C6 and an inductor L1, the radar signal output by the resonant circuit is amplified by using a triode Q4, in order to ensure that the triode Q4 does not generate distortion in operation, the static operating point of the triode Q4 is stabilized by using the resistor R11 and the capacitor C7, the radar signal is coupled to the controller through a capacitor C8 for the controller to analyze the radar signal, the Schottky diode D4 is used to accelerate the reaction speed of the transistor Q4, the capacitor C4 is used to filter the ripple in the voltage provided by the positive power supply VCC to avoid the ripple from selecting radar signal in the tuning output circuit to affect the radar signal frequency, the resistor R9 and the resistor R10 provide proper base voltage for the transistor Q4, which includes a diode D3, the anode of the diode D3 is connected with the other end of the capacitor C3 of the amplification follower circuit, the cathode of the diode D3 is connected with one end of the resistor R9, the anode of the Schottky diode D4, the base of the transistor Q4 and one end of the resistor R10, the other end of the resistor R9 is connected with one end of the capacitor C4, one end of the capacitor C5, one end of the variable capacitor C6, one end of the resistor R7 and one end of the variable inductor L1, the other end of the capacitor C4 is connected with the positive power supply VCC, the other end of the resistor R10 is connected with the other end, One end of a resistor R11, one end of a capacitor C7, a collector of a triode Q4 is connected with a cathode of a Schottky diode D4, the other end of a capacitor C5, the other end of a variable capacitor C6, the other end of a resistor R7 and the other end of a variable inductor L1 respectively, an emitter of the triode Q4 is connected with the other end of a resistor R11 and the other end of the capacitor C7 respectively, the middle position of the variable inductor L1 is connected with one end of the capacitor C8, and the other end of the capacitor C8 is connected with a controller.

When the utility model is used, firstly, the radar detector U1 in the amplifying follower circuit is used for detecting signals, the amplifier composed of a field effect tube Q1 is used for amplifying the voltage of the signals, the capacitor C2 is coupled to the follower composed of a triode Q2 and a triode Q3 as cores, the current of the signals is amplified, the capability of the signal driving tuning output circuit is also improved, a diode D1 and a diode D2 are used for avoiding the generation of cross distortion caused by the simultaneous cut-off of the triode Q2 and the triode Q3 and transmitting the signals to the tuning output circuit through the capacitor C3, the amplified signals are received through the diode D3, the frequency of the radar signals of 10.52GHz is selected by the capacitor C5, the capacitor C6, the resistor R7 and the inductor L1, the signals of other frequencies are filtered, and the 10.52GHz radar signals are amplified again through the triode Q4, the static working point of the triode Q4 is stabilized by using the resistor R11 and the capacitor C7, and the radar signal is coupled to the controller through the capacitor C8 so as to be analyzed by the controller;

signals detected by the radar detector U1 are amplified through a field effect transistor Q1, a triode Q2 and a triode Q3 in the amplification following circuit, the frequency of the radar signals is selected and amplified through a tuning output circuit taking the triode Q4 as a core, the problem that interference is formed when the controller analyzes the received radar signals due to the existence of signals with other frequencies is avoided, and the accuracy of the controller in analyzing the radar signals is improved.

Claims

1. The utility model provides a radar signal detection circuitry, includes radar detecter, controller, radar detecter transmits the radar signal that detects to the controller, its characterized in that, still pass through enlarged following circuit, tuning output circuit in proper order between radar detecter and the controller, enlarged following circuit includes amplifier and follower, and the radar signal that radar detecter detected passes through behind amplifier and the follower in proper order and transmits tuned output circuit.

2. The radar signal detection circuit according to claim 1, wherein the amplification follower circuit comprises a resistor R1, one end of the resistor R1 is connected to pin 1 of the radar detector U1, pin 2 of the radar detector U1 is connected to one end of the resistor R2, one end of the resistor R4, one end of the resistor R5, and one end of the resistor R8, respectively, and connected to ground, the other end of the resistor R1 is connected to the source of the fet Q1 and the other end of the resistor R4, the gate of the fet Q1 is connected to the other end of the resistor R2, the drain of the fet Q1 is connected to one end of the resistor R3 and one end of the capacitor C2, the other end of the resistor R3 is connected to one end of the capacitor C1, one end of the resistor R6, and the collector of the transistor Q2, the other end of the capacitor C1 is connected to ground, the other end of the resistor R6 is connected to the base of the transistor Q6 and the anode of the diode D6, and the cathode of the diode D6 is, The other end of the capacitor C2, the negative pole of the diode D2 are respectively connected with the other end of the resistor R5 and the base of the triode Q3, the collector of the triode Q3 is connected with the other end of the resistor R8, the emitter of the triode Q2 is respectively connected with one end of the capacitor C3 and the emitter of the triode Q3, the amplifier is composed of the triode Q1, the resistor R2, the resistor R3 and the resistor R4, and the follower is composed of the triode Q2, the triode Q3, the resistor R6, the resistor R8, the diode D1, the diode D2 and the resistor R5.

3. The radar signal detecting circuit of claim 1, wherein the tuning output circuit includes a diode D3, an anode of the diode D3 is connected to the other end of a capacitor C3 of the amplification follower circuit, cathodes of the diode D3 are respectively connected to one end of a resistor R9, an anode of a Schottky diode D4, a base of a transistor Q4, and one end of a resistor R10, the other end of the resistor R9 is respectively connected to one end of a capacitor C4, one end of a capacitor C5, one end of a variable capacitor C6, one end of a resistor R7, and one end of a variable inductor L1, and is connected to the positive power source VCC, another end of the capacitor C4 is respectively connected to another end of a resistor R10, one end of a resistor R11, and one end of a capacitor C7, a collector of a transistor Q4 is respectively connected to a cathode of a Schottky diode D4, another end of a capacitor C5, another end of a variable capacitor C6, another end of a resistor R7, and another end of a variable inductor L1, an emitting electrode of the triode Q4 is respectively connected with the other end of the resistor R11 and the other end of the capacitor C7, the middle position of the variable inductor L1 is connected with one end of the capacitor C8, and the other end of the capacitor C8 is connected with the controller.