CN110967694A - Radar early warning system for 77GHz locomotive - Google Patents
Radar early warning system for 77GHz locomotive Download PDFInfo
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- CN110967694A CN110967694A CN201911335189.9A CN201911335189A CN110967694A CN 110967694 A CN110967694 A CN 110967694A CN 201911335189 A CN201911335189 A CN 201911335189A CN 110967694 A CN110967694 A CN 110967694A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S13/00—Systems using the reflection or reradiation of radio waves, e.g. radar systems; Analogous systems using reflection or reradiation of waves whose nature or wavelength is irrelevant or unspecified
- G01S13/88—Radar or analogous systems specially adapted for specific applications
- G01S13/93—Radar or analogous systems specially adapted for specific applications for anti-collision purposes
- G01S13/931—Radar or analogous systems specially adapted for specific applications for anti-collision purposes of land vehicles
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62J—CYCLE SADDLES OR SEATS; AUXILIARY DEVICES OR ACCESSORIES SPECIALLY ADAPTED TO CYCLES AND NOT OTHERWISE PROVIDED FOR, e.g. ARTICLE CARRIERS OR CYCLE PROTECTORS
- B62J3/00—Acoustic signal devices; Arrangement of such devices on cycles
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62J—CYCLE SADDLES OR SEATS; AUXILIARY DEVICES OR ACCESSORIES SPECIALLY ADAPTED TO CYCLES AND NOT OTHERWISE PROVIDED FOR, e.g. ARTICLE CARRIERS OR CYCLE PROTECTORS
- B62J6/00—Arrangement of optical signalling or lighting devices on cycles; Mounting or supporting thereof; Circuits therefor
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62J—CYCLE SADDLES OR SEATS; AUXILIARY DEVICES OR ACCESSORIES SPECIALLY ADAPTED TO CYCLES AND NOT OTHERWISE PROVIDED FOR, e.g. ARTICLE CARRIERS OR CYCLE PROTECTORS
- B62J99/00—Subject matter not provided for in other groups of this subclass
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62L—BRAKES SPECIALLY ADAPTED FOR CYCLES
- B62L3/00—Brake-actuating mechanisms; Arrangements thereof
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S13/00—Systems using the reflection or reradiation of radio waves, e.g. radar systems; Analogous systems using reflection or reradiation of waves whose nature or wavelength is irrelevant or unspecified
- G01S13/02—Systems using reflection of radio waves, e.g. primary radar systems; Analogous systems
- G01S13/50—Systems of measurement based on relative movement of target
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S13/00—Systems using the reflection or reradiation of radio waves, e.g. radar systems; Analogous systems using reflection or reradiation of waves whose nature or wavelength is irrelevant or unspecified
- G01S13/02—Systems using reflection of radio waves, e.g. primary radar systems; Analogous systems
- G01S13/50—Systems of measurement based on relative movement of target
- G01S13/58—Velocity or trajectory determination systems; Sense-of-movement determination systems
Abstract
The invention relates to a radar early warning system for a 77GHz locomotive, which comprises an MCU (microprogrammed control unit) main control module and an early warning module, wherein the MCU main control module is used for judging the danger degree according to the danger degree criterion and sending different signals to the early warning module according to the danger degree when the danger exists, and the early warning module is used for carrying out different early warnings after receiving different signals. According to the radar early warning system for the 77GHz locomotive, the millimeter wave radar is adopted to detect surrounding road conditions, the influence of illumination conditions is avoided, and the reliability and the stability are high; the distance measurement, the speed measurement and the angle measurement are carried out at the same time, the danger coefficient is comprehensively judged through multiple information, and the reliability is high; the computer is used for replacing the brain of a human body to judge the danger coefficient, when the danger coefficient is higher, the locomotive hand is reminded through sound-light alarm and vibration alarm, the locomotive hand is prevented from watching the display and being distracted, forced deceleration is carried out if necessary, and risks are avoided.
Description
Technical Field
The invention belongs to the technical field of radar near-field measurement, and relates to a radar early warning system for a 77GHz locomotive.
Background
With the development of science and technology, people pay more and more attention to driving safety. In daily life, the locomotive has higher maneuverability and very high use frequency, so people pay more attention to the driving safety of the locomotive; because the speed of the motor vehicle is relatively high, devices for guaranteeing safe driving are also installed, however, the motor vehicle has the mobility of the motor vehicle, and can reach or even exceed the driving speed of the motor vehicle, the guarantee of safe driving is often ignored, and currently, no mature radar product is available on the market for warning the driving of the motor vehicle.
Meanwhile, due to the characteristics of high locomotive maneuverability and fast acceleration, a locomotive driver cannot know the information and safety conditions of surrounding roads in real time like a motor vehicle driver, so that the significance of a real-time display device like an automobile radar is not very great, but the danger prompt of the locomotive driver is practical in a certain sound-light alarm or vibration alarm mode, and when the danger degree is too high, the speed can be limited forcibly.
At present, the mainstream radar early warning scheme in the market is only to detect surrounding targets, then display the information of the targets in a display or only prompt a vehicle in a certain direction, but not to prompt the danger degree of the vehicle, and only detect the speed or the distance, and alarm when the speed is too high or the distance is too close to the front vehicle. However, distance measurement, speed measurement and angle measurement need to be taken into consideration simultaneously, danger coefficients are comprehensively judged according to the three information, early warning is carried out, and the reliability is higher.
The different early warnings according to the danger degree are only limited to the condition that the automobile parks in a parking lot and leaves a garage, the automobile carries out early warnings with different frequencies according to the distance between the automobile and the front and rear automobiles, and the early warnings according to different danger degrees in the driving process of the automobile are not available in the current market.
Therefore, the research of the locomotive radar system which gives consideration to distance measurement, speed measurement and angle measurement, comprehensively judges the danger coefficient according to the three information and then carries out early warning has very important significance.
Disclosure of Invention
The invention aims to solve the problem that a locomotive driver cannot timely and accurately sense the safety of the surrounding environment in the high-speed running process of the locomotive in the prior art, and provides a radar early warning system for a 77GHz locomotive.
In order to achieve the purpose, the invention adopts the following scheme:
the utility model provides a 77GHz locomotive radar early warning system, 77GHz is the operating frequency of radar, is that the radar of working at the 77GHz frequency channel provides detection, early warning service for the locomotive, and this system can be used for all locomotives, including MCU host system and early warning module, MCU host system is used for judging the danger degree according to the danger degree criterion to send different signals to the early warning module according to the danger degree when having danger, the early warning module is used for carrying out different early warnings after receiving different signals.
As a preferred technical scheme:
according to the radar early warning system for the 77GHz locomotive, different signals are PWM waves with different duty ratios, or PWM waves with different frequencies, namely different signals are PWM waves with a duty ratio of a1, PWM waves with a duty ratio of a2, PWM waves with a duty ratio of a3, PWM waves with a duty ratio of a4 and the like, or different signals are PWM waves with a frequency of b1, PWM waves with a frequency of b2, PWM waves with a frequency of b3, PWM waves with a frequency of b4 and the like, the early warning module comprises a buzzer and/or an LED lamp group, wherein the buzzer sends buzzes with different loudness after receiving the PWM waves with different duty ratios, the LED lamp group sends buzzes with different frequencies after receiving the PWM waves with different duty ratios, and the LED lamp group sends out light with different brightness after receiving the PWM waves with different duty ratios and flashes with different frequencies after receiving the PWM waves with different frequencies.
According to the radar early warning system for the 77GHz locomotive, different signals are different voltage signals, namely the different signals are a voltage signal with a value of c1, a voltage signal with a value of c2, a voltage signal with a value of c3, a voltage signal with a value of c4 and the like, the early warning module comprises a vibrator, the vibrator is arranged inside a handle of the locomotive or below a seat, and the vibrator can vibrate in different amplitudes after receiving the different voltage signals.
As above a 77GHz locomotive radar early warning system, early warning module still includes brake controller, and brake controller and locomotive brake system are connected, MCU host system still is used for when the degree of danger reaches the highest grade, sends brake signal to brake controller, can control the locomotive brake system brake after brake signal is received to brake controller, and concrete control process is: the brake controller controls the baffle to push brake oil in the oil can, and at the moment, the brake oil simultaneously pushes the piston of the caliper to enable the brake pad and the brake pad to generate friction, so that braking force is generated, and the locomotive is decelerated.
The early warning module can be one of buzzer, LED banks, vibrator, can be buzzer and brake controller, can be LED banks and brake controller, can be buzzer, LED banks and brake controller, can be buzzer and LED banks, can be LED banks and vibrator, can be buzzer, LED banks and vibrator etc. specific combination form is not limited, can select according to actual demand.
Almost all buzzers and LED lamp groups can control loudness (brightness) by duty ratio, the duty ratio controls power, the power can naturally change loudness (brightness), almost all buzzers and LED lamp groups can control ringing (flashing) frequency by frequency, the frequency is changed by power-on interval time, the power-on interval time is changed, and the ringing (flashing) frequency naturally changes.
According to the radar early warning system for the 77GHz locomotive, the risk degree criterion is distance R between the locomotive and a target, speed v and angle β of the locomotive, the distance R between the locomotive and the target is m, the speed v of the locomotive is m/s, and the angle β is an included angle between the advancing direction of the locomotive and a connecting line between the locomotive and the target.
According to the radar early warning system for the 77GHz locomotive, the judgment steps of the danger degree are as follows:
(1) judgment of
If yes, entering the next step; otherwise, judging that no danger exists;
(2) calculating the risk coefficient w according to the following calculation formula:
wherein a is the absolute value of the acceleration of the locomotive during sudden braking and the unit is m/s2The formula is a dimensionless calculation formula, and a unit is not required to be brought in the calculation;
(3) and comparing the risk coefficient w with different threshold values to determine the risk degree.
According to the radar early warning system for the 77GHz locomotive, different threshold values are a threshold value I and a threshold value II, and when w is larger than or equal to the threshold value II, the danger degree reaches the highest level; when the threshold value I is less than or equal to w and less than the threshold value II, the danger degree reaches an intermediate level; when w < threshold I, the risk level reaches a minimum level. The number of thresholds is not limited to two, the risk level is not limited to three levels, and the adjustment can be made according to actual requirements, which is only exemplified here. The method for determining the threshold is not limited, and may be obtained empirically, or may be obtained through simulation, for example, the distance R between the locomotive and the target and the speed v of the locomotive when traffic accidents occur in different degrees are collected (a is an absolute value of the acceleration of the locomotive during sudden braking and may be regarded as a fixed value), the data of the traffic accidents causing casualties are calculated to obtain a plurality of risk coefficients w, the minimum value of the risk coefficients w is used as the threshold II, the data of the traffic accidents not causing casualties are calculated to obtain a plurality of risk coefficients w, and the minimum value of the risk coefficients w is used as the threshold I.
The radar early warning system for the 77GHz locomotive further comprises a radio frequency transceiving module and a signal preprocessing module;
the radio frequency transceiver module mainly comprises a frequency generator, a Power Amplifier (PA), a transmitting antenna, a receiving antenna and a mixer, the radio frequency transceiver module is a functional module of a linear frequency modulation continuous wave radar, and a component, the linear frequency modulation continuous wave is a limiting word of the radar, which indicates that the radar adopts a linear frequency modulation continuous wave technology to realize related functions, the linear frequency modulation continuous wave radar is a radar, one subclass of the whole radar class is a product with all functions of the radar;
the signal preprocessing module mainly comprises a low noise amplifier, a filter and an ADC (analog to digital converter);
the frequency generator is used for generating millimeter wave signals under the action of sawtooth wave modulation and sending the millimeter wave signals to the Power Amplifier (PA), the Power Amplifier (PA) is used for amplifying the signals and sending the signals to the transmitting antenna and the mixer, the transmitting antenna is used for transmitting the amplified signals, the receiving antenna is used for receiving echo signals and sending the echo signals to the mixer, the mixer is used for mixing the amplified signals and the echo signals to generate beat signals and sending the beat signals to the low-noise amplifier (the mixer has two inputs and one output, and the two inputs are the amplified signals sent by the power amplifier and the echo signals received by the receiving antenna respectively);
the low noise amplifier is used for amplifying the signal and sending the signal to the filter, the filter is used for filtering the signal and then sending the signal to the ADC, and the ADC is used for performing ADC on the signal to form a digital signal and sending the digital signal to the MCU main control module;
the MCU main control module is also used for processing the digital signals to obtain a risk degree criterion, and the specific process is that two-dimensional fast Fourier transform (2D-FFT) is carried out on the digital signals to obtain the distance R between the locomotive and the target and the speed v of the locomotive, the target is separated from noise based on peak detection operation and constant false alarm detection (CFAR), and an angle β is measured by adopting a Digital Beam Forming (DBF) method (the MCU main control module realizes 2D-FFT, CFAR, DBF and judges the risk degree through programming).
According to the radar early warning system for the 77GHz locomotive, the early warning module further comprises a display, and the display is used for displaying the distance R between the locomotive and a target, the speed v of the locomotive and the angle β.
The invention discloses a radar early warning system for a 77GHz locomotive, which is different from the prior art, is not only used for distance measurement, but also used for judging the possibility of danger through distance measurement, and is used for distance measurement, speed measurement and angle measurement simultaneously, wherein the longer distance does not mean absolute safety, the closer distance does not necessarily cause danger, the speed of the locomotive is also considered, and the performance of the locomotive is also a great influence factor, such as the maximum acceleration. According to the 77GHz locomotive radar early warning system, the information of the distance, the speed and the angle of a front vehicle is detected by adopting a 77GHz millimeter wave radar, and is displayed in real time, and meanwhile, the situation that the road condition of the locomotive is changed fast is considered, and a locomotive driver cannot view related information in time like a car driver, so that the processor replaces the brain to judge the danger coefficient, if necessary, the locomotive driver is reminded by the acousto-optic alarm system and the vibration device, and the action of viewing target information by the locomotive driver is omitted, so that the situation that the locomotive driver is distracted and the locomotive driving is influenced is avoided.
Has the advantages that:
compared with the prior art, the radar early warning system for the 77GHz locomotive has the following outstanding characteristics:
(1) the millimeter wave radar is adopted to detect surrounding road conditions, so that the influence of illumination conditions is avoided, and the reliability and the stability are high;
(2) the distance measurement, the speed measurement and the angle measurement are carried out at the same time, the danger coefficient is comprehensively judged through multiple information, and the reliability is high;
(3) the danger coefficient is judged by using a computer instead of a human brain, so that the driver of the locomotive is prevented from being distracted by watching the display;
(4) when the danger coefficient is higher, the locomotive crew is reminded through sound-light alarm and vibration alarm, and distraction caused by the fact that the locomotive crew views the display is avoided;
(5) when the danger coefficient is too high, the speed is forcibly reduced, and the risk is avoided.
Drawings
FIG. 1 is a schematic structural diagram of a radar early warning system for a 77GHz locomotive.
Detailed Description
The invention will be further illustrated with reference to specific embodiments. It should be understood that these examples are for illustrative purposes only and are not intended to limit the scope of the present invention. Further, it should be understood that various changes or modifications of the present invention may be made by those skilled in the art after reading the teaching of the present invention, and such equivalents may fall within the scope of the present invention as defined in the appended claims.
Example 1
A radar early warning system for a 77GHz locomotive is shown in figure 1 and comprises an MCU main control module, an early warning module, a radio frequency transceiving module and a signal preprocessing module;
the MCU main control module is used for processing the digital signals to obtain a danger degree criterion, the specific process of processing the digital signals comprises the steps of carrying out two-dimensional fast Fourier transform on the digital signals to obtain the distance R between a locomotive and a target and the speed v of the locomotive, separating the target from noise based on peak detection operation and constant false alarm detection, and measuring an angle β by adopting a digital beam forming method, judging the danger degree according to the danger degree criterion by the MCU main control module, and sending different signals to the early warning module according to the danger degree when the danger exists, wherein the different signals are PWM waves with different duty ratios and different voltage signals, the danger degree criterion is the distance R between the locomotive and the target, the speed v and the angle β of the locomotive, the unit of the distance R between the locomotive and the target is m, the unit of the speed v of the locomotive is m/s, and the angle β is an included angle between the advancing direction of the locomotive and a connecting line of the locomotive and the target, and the judgment step of the:
(1) judgment of
If yes, entering the next step; otherwise, judging that no danger exists;
(2) calculating the risk coefficient w according to the following calculation formula:
wherein a is the absolute value of the acceleration of the locomotive during sudden braking and the unit is m/s2；
(3) Comparing the risk coefficient w with different threshold values to determine the risk degree; wherein, the different threshold values are a threshold value I and a threshold value II, and when w is more than or equal to the threshold value II, the risk degree reaches the highest level; when the threshold value I is less than or equal to w and less than the threshold value II, the danger degree reaches an intermediate level; when w < threshold I, the risk level reaches a minimum level;
the MCU master control module is also used for sending a brake signal to the brake controller when the danger degree reaches the highest level;
the early warning module is used for carrying out different early warnings after receiving different signals and comprises a buzzer, an LED lamp bank, a vibrator, a display and a brake controller, wherein the vibrator is arranged in a handle of the locomotive or below a seat;
the radio frequency transceiving module consists of a frequency generator, a power amplifier, a transmitting antenna, a receiving antenna and a mixer; the frequency generator is used for generating millimeter wave signals under the action of sawtooth wave modulation and sending the millimeter wave signals to the power amplifier, the power amplifier is used for amplifying the signals and sending the signals to the transmitting antenna and the frequency mixer, the transmitting antenna is used for transmitting the amplified signals, the receiving antenna is used for receiving echo signals and sending the echo signals to the frequency mixer, and the frequency mixer is used for mixing the amplified signals and the echo signals to generate beat signals and sending the beat signals to the low-noise amplifier;
the signal preprocessing module consists of a low noise amplifier, a filter and an ADC (analog to digital converter); the low noise amplifier is used for amplifying signals and sending the signals to the filter, the filter is used for filtering the signals and then sending the signals to the ADC, and the ADC is used for converting the signals into digital signals through the ADC and sending the digital signals to the MCU main control module.
Example 2
The utility model provides a 77GHz locomotive radar early warning system, is the same basically with embodiment 1, the difference lies in that do not contain LED banks, vibrator in the early warning module, and the MCU host system sends the different signal of early warning module and be the PWM ripples of different duty cycles, and this early warning system height can be through audible alarm to the locomotive hand make the warning, saves the locomotive hand and observes the action of target information to avoid the locomotive hand to be distracted, influence the locomotive and travel.
Example 3
The utility model provides a 77GHz locomotive radar early warning system, is the same basically with embodiment 1, the difference lies in that do not contain bee calling organ, LED banks in the early warning module, and the signal that MCU host system sent the difference of early warning module is different voltage signal, and this early warning system height can be through vibrating device to the locomotive hand make the warning, saves the action that the locomotive hand observes target information to avoid locomotive hand distraction, influence the locomotive and travel.
Example 4
The utility model provides a 77GHz locomotive radar early warning system, is the same basically with embodiment 1, the difference lies in that do not contain bee calling organ, vibrator in the early warning module, and the MCU host system sends the different signal of early warning module and be the PWM ripples of different frequencies, and this early warning system height can be through light warning to the locomotive hand and remind, saves the locomotive hand and observes the action of target information to avoid locomotive hand distraction, influence the locomotive and travel.
Example 5
The utility model provides a 77GHz locomotive radar early warning system, is the same basically with embodiment 1, the difference lies in that not contain the bee calling organ in the early warning module, and the MCU host system sends the different signals of early warning module for the PWM ripples of different frequencies and different voltage signal, and this early warning system height can be through light warning and vibrating device to the locomotive hand make the warning, saves the action that the locomotive hand looked the target information to avoid the locomotive hand to be distracted, influence the locomotive and travel.
Example 6
The utility model provides a 77GHz locomotive radar early warning system, is the same basically with embodiment 1, the difference lies in that do not contain the LED banks in the early warning module, and the MCU host system sends the different signal of early warning module and be the PWM ripples and the different voltage signal of different duty cycles, and this early warning system height can make the warning to the locomotive hand through audible alarm and vibrating device, saves the action that the locomotive hand looked the target information to avoid the locomotive hand to be distracted, influence the locomotive and travel.
Example 7
The utility model provides a 77GHz locomotive radar early warning system, is the same basically with embodiment 1, the difference lies in that do not contain the vibrator in the early warning module, and the MCU host system sends the different signal of early warning module and be the PWM ripples of different duty cycles, and this early warning system height can be through audible and visual warning to locomotive hand and make the suggestion, saves the action that locomotive hand observes target information to avoid locomotive hand distraction, influence the locomotive and travel.
Claims (9)
1. The utility model provides a 77GHz locomotive radar early warning system which characterized by: the intelligent warning system comprises an MCU (microprogrammed control unit) main control module and a warning module, wherein the MCU main control module is used for judging the danger degree according to the danger degree criterion and sending different signals to the warning module according to the danger degree when danger exists, and the warning module is used for carrying out different warnings after receiving different signals.
2. The radar warning system for a 77GHz locomotive according to claim 1, wherein the different signals are PWM waves with different duty ratios or PWM waves with different frequencies, and the warning module comprises a buzzer and/or an LED lamp set.
3. The radar warning system for a 77GHz locomotive according to claim 1, wherein the different signals are different voltage signals, and the warning module comprises a vibrator, and the vibrator is arranged inside a handle of the locomotive or under a seat.
4. The radar early warning system for a 77GHz locomotive according to claim 2 or 3, wherein the early warning module further comprises a brake controller, the brake controller is connected with the locomotive brake system, and the MCU main control module is further used for sending a brake signal to the brake controller when the danger degree reaches the highest level.
5. The radar warning system for a 77GHz locomotive according to claim 4, wherein the criterions of the danger degree are a distance R between the locomotive and the target, a speed v of the locomotive and an angle β, the distance R between the locomotive and the target is m, the speed v of the locomotive is m/s, and the angle β is an included angle between a forward direction of the locomotive and a line connecting the locomotive and the target.
6. The radar warning system for a 77GHz locomotive according to claim 5, wherein the step of judging the danger level comprises:
(1) judgment of
If yes, entering the next step; otherwise, judging that no danger exists;
(2) calculating the risk coefficient w according to the following calculation formula:
wherein a is the absolute value of the acceleration of the locomotive during sudden braking and the unit is m/s2；
(3) And comparing the risk coefficient w with different threshold values to determine the risk degree.
7. The radar early warning system for a 77GHz locomotive according to claim 6, wherein different threshold values are a threshold value I and a threshold value II, and when w is larger than or equal to the threshold value II, the danger degree reaches the highest level; when the threshold value I is less than or equal to w and less than the threshold value II, the danger degree reaches an intermediate level; when w < threshold I, the risk level reaches a minimum level.
8. The radar early warning system for the 77GHz locomotive according to claim 7, wherein the radar early warning system for the 77GHz locomotive further comprises a radio frequency transceiver module and a signal preprocessing module;
the radio frequency transceiver module mainly comprises a frequency generator, a power amplifier, a transmitting antenna, a receiving antenna and a mixer;
the signal preprocessing module mainly comprises a low noise amplifier, a filter and an ADC (analog to digital converter);
the frequency generator is used for generating millimeter wave signals under the action of sawtooth wave modulation and sending the millimeter wave signals to the power amplifier, the power amplifier is used for amplifying the signals and sending the signals to the transmitting antenna and the frequency mixer, the transmitting antenna is used for transmitting the amplified signals, the receiving antenna is used for receiving echo signals and sending the echo signals to the frequency mixer, and the frequency mixer is used for mixing the amplified signals and the echo signals to generate beat signals and sending the beat signals to the low-noise amplifier;
the low noise amplifier is used for amplifying the signal and sending the signal to the filter, the filter is used for filtering the signal and then sending the signal to the ADC, and the ADC is used for performing ADC on the signal to form a digital signal and sending the digital signal to the MCU main control module;
the MCU main control module is also used for processing the digital signals to obtain a danger degree criterion, and the specific process is that two-dimensional fast Fourier transform is carried out on the digital signals to obtain the distance R between the locomotive and the target and the speed v of the locomotive, the target is separated from noise based on peak detection operation and constant false alarm detection, and an angle β is measured by adopting a digital beam forming method.
9. The radar warning system for a 77GHz locomotive according to claim 8, wherein the warning module further comprises a display for displaying the distance R between the locomotive and the target, the speed v of the locomotive and the angle β.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111522010A (en) * | 2020-06-04 | 2020-08-11 | 四川九洲电器集团有限责任公司 | Method and system for processing automobile anti-collision radar signals |
| CN113650710A (en) * | 2021-08-31 | 2021-11-16 | 向量传感科技(宁波)有限公司 | Motorcycle collision avoidance method and system, electronic equipment and storage medium |
| CN113671491A (en) * | 2021-08-16 | 2021-11-19 | 珠海格力电器股份有限公司 | Road condition detection and early warning method and device |
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