CN209525451U - A kind of 77GHz millimeter wave gate cracking protection radar - Google Patents

Abstract

The utility model provides a kind of 77GHz millimeter wave gate cracking protection radar signal processing device, comprising: radio-frequency module, power module, DSP module, ARM module, serial communication module；Power module is radio-frequency module, DSP module, ARM module provide power supply；Radio-frequency module includes 2 groups of transmitting antennas, 4 groups of receiving antennas, synthesizer and frequency mixer；Synthesizer generates a chirp and is emitted by transmitting antenna Tx, and receiving antenna Rx captures the reflecting linear frequency modulation on pulse that reflection generates；Frequency mixer merges Rx and Tx signal, generates intermediate frequency (IF) signal；DSP module carries out FFT processing to IF signal, then carries out CFAR detection, by detected information compared with thresholding, eliminates interference noise, target required for exporting；ARM module receives the target information of DSP module output, carries out decision-making treatment to target information, and decision information required for being exported by serial communication modular is interacted with the end PC.

Description

A kind of 77GHz millimeter wave gate cracking protection radar

Technical field

The invention belongs to radar and gate cracking protection technical field, specifically a kind of 77GHz millimeter wave gate cracking protection radar.

Background technique

Banister is mainly used in access control field, falls lock by opening and controls the orderly disengaging of vehicle, applies at present The relatively broad anti-technology of pounding has 3 kinds: ground induction coil, infrared ray and pressure wave.Ground induction coil need to cut road surface, difficulty of construction Greatly, and people cannot be identified；Infrared opposite-radiation range is small, is easy to be influenced by weather, accidentally touching rate is high；Pressure wave is that one kind is hampered and returns Return device, needing to contact with vehicle and people can just return, and there are security risks.

Banister radar, which is adopted, to be had the characteristics that high-precision, exempts from debugging, high stability, can be distinguished vehicle and pedestrian, effectively be kept away Exempt from banister to pound occurrences in human life therefore occur, can adjust detections of radar distance according to restrictor bar length or road width, be consolidated by serial ports Part upgrading, provides reliable basis for intelligent parking lot management.

24G radar is mostly used on the market at present, and 24G frequency radar bandwidth is too small, its distance and velocity resolution is all It is not high.77GHz millimetre-wave radar works in 77-81G frequency range, and distance resolution can reach 4cm, and measuring accuracy is high, is applied to road Lock is anti-to be pounded, and can accurately identify people and Che.

Summary of the invention

Aiming at the problem that background technique proposes, it is an object of the present invention to provide a kind of 77GHz millimeter wave gate cracking protection thunders It reaches, reduces banister and pound the risk that people pounds vehicle.

To achieve the above object, the present invention adopts the following technical scheme:

A kind of 77GHz millimeter wave gate cracking protection radar, comprising: radio-frequency module, power module, DSP module, ARM module, string Mouth communication module；Power module is radio-frequency module, DSP module, ARM module provide power supply；Radio-frequency module includes 2 groups of transmitting antennas (Tx antenna), 4 groups of receiving antennas (Rx antenna), synthesizer and frequency mixer；Synthesizer generates a chirp by emitting Antenna Tx emits, if having target appearance in the detection range needed for banister, it will generates to the chirp of transmitting Reflection, receiving antenna Rx capture the reflecting linear frequency modulation on pulse that reflection generates；Frequency mixer is that two signals are merged together life At the electronic building brick of the new signal with new frequency, it is responsible for merging Rx and Tx signal, generates intermediate frequency (IF) signal；DSP Module carries out FFT processing to IF signal, then carries out CFAR detection, by detected information compared with thresholding, eliminates interference Clutter, target required for exporting；ARM module receives the target information of DSP module output, and ARM module is controlled to banister at this time One high level signal of end output, the state for maintaining banister to open have within the scope of detections of radar and do not fall disorderly in the case where target Bar, while decision-making treatment is carried out to target information, target is identified, decision required for being exported by serial communication modular Information is interacted with the end PC, and when target disappears in detection zone required for banister, ARM module is exported to banister control terminal One low level signal, restrictor bar are closed.

Further, a kind of 77GHz millimeter wave gate cracking protection radar, can by serial communication modular send order into Enter automatic identification installation environment mode, since banister is normally at parking lot or cell doorway, field condition is complex, and thunder It is very sensitive up to performance, it might have the object of some guided bones such as roadblock in the range of banister is needed and detected, it can be to process The target object of banister generates interference, makes radar that can not accurately judge that target object passes through the process of banister, so needing to carry out Background scene record, after automatic identification model starting, radar receives the reflecting linear frequency modulation on pulse of ambient enviroment, by distance FFT processing is tieed up, the information of target range R value and the energy peak p of return included in ambient enviroment is obtained, by these information It is recorded and stored in region of memory, the static background of simulation building ambient enviroment；

In the operation of subsequent radar, the backward energy peak value of environmental background can be shielded, only output is detected by banister The energy peak information of the target in region；Order is sent by serial communication modular to enter apart from shaping modes, it can be according to banister Effective detection zone range of the demand modification radar of erecting bed, by detecting distance Yz actually required, the width Xr of detection (right side detection width), detection width on the left of Xl() ARM module is transmitted to by serial port command, ARM module receives serial ports and orders Information is enabled, the distance in match information adjusts information, only does identification and decision-making treatment to the target object in valid analysing range；

By ARM module by the detecting distance Yz actually required, detection width Xr(on the right side of detection width) and Xl (left side detection width) information is transmitted to DSP module, does last screening together according to configuration information by DSP module, will collect All targets grid bearing compared with configuration information, only by required for us configuration range in target information filter out To export to AMR module.

Further, a kind of 77GHz millimeter wave gate cracking protection radar, radar signal is after treatment, ARM module The target information for receiving DSP module output carries out decision-making treatment, the process and method identified to target to target information Be: the target information (azimuthal coordinates (X, Y), energy peak P) that will acquire is sent to ARM module, in ARM module, by a frame The energy peak P of multiple target points collected is compared in data, takes return value point of maximum intensity Pm, while to same frame data In all target points X value carry out size comparison, seek maximum difference Xc；According to the frame number continuity of a target, to continuous more The Pm of frame data then adds up to target confidence level F1 if more than first threshold value Ps1 compared with threshold value, then with second A threshold value Ps2 is compared, and if more than the second threshold value, is added up to target confidence level F2, and F2 is Continuous accumulation value, if Once Pm < Ps2, then by F2 zero setting；Decision-making treatment is carried out to F1, F2, Xc, if the accumulated value of F1 or F2 is greater than people's vehicle Lowest confidence value Fm is distinguished, then maximum difference Xc is judged, if maximum difference Xc > Xr or Xc > Xl, can determine whether this The target object of secondary process is vehicle, distinguishes screening by carrying out people's vehicle to the target object by banister, can targetedly control Restrictor bar processed rises and falls, and avoids when vehicle is without banister, and accidentally touching causes restrictor bar to fall to pedestrian, and vehicle needs retriggered road The case where lock.

The beneficial effect comprise that radar of the invention uses multiple-input multiple-output mode, there is high angle-resolved, survey It is wide to try range；It is small in size using highly integrated chip, it is easily installed, stability is high, will not be by weather and some extraneous factors It influences；By Target Recognition Algorithms built in ARM, people's vehicle is carried out to the target object by banister and distinguishes screening, is avoided in vehicle When without banister, accidentally touching causes restrictor bar to fall to pedestrian, the case where vehicle needs retriggered banister；Radar signal processing device Signal processing can modify effective detection zone of radar with automatic identification installation environment according to the demand of banister erecting bed Range configures radar running parameter；The radar performance is stablized, strong interference immunity；It is quick on the draw, reduces and pound the wind that people pounds vehicle Danger；Mounting means is simple and convenient.

Detailed description of the invention

Fig. 1 monolithically fabricated figure；

Fig. 2 Radar Signal Processing flow chart.

Specific embodiment

With reference to the accompanying drawing, the present invention is further illustrated, in order to those skilled in the art understand that the present invention.

As shown in Fig. 1, a kind of 77GHz millimeter wave gate cracking protection radar, comprising: radio-frequency module, power module, DSP mould Block, ARM module, serial communication module；Power module is radio-frequency module, DSP module, ARM module provide power supply；Radio-frequency module packet Include 2 groups of transmitting antennas, 4 groups of receiving antennas, synthesizer and frequency mixer；Frequency mixer generates a chirp by transmitting antenna Tx transmitting, receiving antenna Rx capture the reflecting linear frequency modulation on pulse that reflection generates；Frequency mixer merges Rx and Tx signal, generates one A intermediate frequency (IF) signal；As shown in Fig. 2, DSP module carries out FFT processing to IF signal, then carries out CFAR detection, will be by The information of detection eliminates interference noise compared with thresholding, target required for exporting；ARM module receives the mesh of DSP module output Information is marked, decision-making treatment is carried out to target information, decision information required for being exported by serial communication modular is carried out with the end PC Interaction.

During the installation process, a kind of 77GHz millimeter wave gate cracking protection radar is sent by serial communication modular and is ordered Target range R value included in ambient enviroment is obtained by distance dimension FFT processing into automatic identification installation environment mode With the information of the energy peak p of return, these information are recorded and stored in region of memory, the static state of simulation building ambient enviroment Background.

In the operation of subsequent radar, the target point of acquisition is compared with the static object figure of building, is carried out for the first time Screening；Order is sent by serial communication modular to enter apart from shaping modes, is detected according to required for the banister of use site Distance and range can be configured by serial ports, by information by ARM module transfer to DSP module, be handled by DSP module, will Signal is allocated to radio-frequency module, and adaptive installation environment adjusts detecting distance and range.

In use process, a kind of 77GHz millimeter wave gate cracking protection radar, radar signal will be obtained after treatment The target information (azimuthal coordinates (X, Y), energy peak P) taken is sent to ARM module, in ARM module, by institute in a frame data The energy peak P of multiple target points of acquisition is compared, and takes return value point of maximum intensity Pm, while to all mesh in same frame data The X value of punctuate carries out size comparison, seeks maximum difference Xc；According to the frame number continuity of a target, to continuous multiple frames data Pm then adds up to flag bit F1 if more than first threshold value Ps1 compared with threshold value, then with second threshold value Ps2 It being compared, if more than the second threshold value, adds up to flag bit F2, F2 is Continuous accumulation value, if once Pm < Ps2, Then by F2 zero setting；Decision-making treatment is carried out to F1, F2, Xc and accurately identifies people's vehicle so that the target to this distinguishes, for The control banister of property.

Above embodiments are merely to illustrate a specific embodiment of the invention, rather than for limiting the present invention, the present invention Range claimed is subject to described in claims.

Claims (4)

1. a kind of 77GHz millimeter wave gate cracking protection radar characterized by comprising radio-frequency module, power module, DSP module, ARM module, serial communication module；

The power module is radio-frequency module, DSP module, ARM module provide power supply；

The radio-frequency module includes 2 groups of transmitting antenna Tx antennas, 4 groups of receiving antenna Rx antennas, synthesizer and frequency mixer；The conjunction One chirp of generation of growing up to be a useful person is emitted by transmitting antenna Tx, and receiving antenna Rx captures the reflecting linear frequency modulation that reflection generates Pulse；The frequency mixer is that two signals are merged together to the electronic building brick for generating the new signal with new frequency, and being responsible for will Rx and Tx signal merges, and generates intermediate frequency (IF) signal；

The DSP module carries out FFT processing to IF signal, then carries out CFAR detection, by detected information and thresholding ratio Compared with, elimination interference noise, target required for exporting；

The ARM module receives the target information of DSP module output, in the case where having target within the scope of detections of radar, to road Lock control terminal exports a high level signal, and the state for maintaining banister to open does not fall bar；Meanwhile the ARM module believes target Breath carries out decision-making treatment, identifies to target, carries out people's vehicle to the target object by banister and distinguishes screening, passes through the string Decision information required for port communications module exports, interacts with the end PC；When target disappears in detection zone required for banister Domain, the ARM module export a low level signal to banister control terminal, and restrictor bar is closed.

2. a kind of 77GHz millimeter wave gate cracking protection radar according to claim 1, which is characterized in that it further include memory modules, The information of the target range R value at installation environment scene and the energy peak P of return is stored in the memory modules.

3. a kind of 77GHz millimeter wave gate cracking protection radar according to claim 2, which is characterized in that pass through serial communication mould Block sends order and enters apart from shaping modes, and by serial port command transmission range adjustment parameter to ARM module, ARM module is received To serial port command information, the distance in match information adjusts information, only to the target object in valid analysing range do identification and Decision-making treatment.

4. a kind of 77GHz millimeter wave gate cracking protection radar according to claim 3, which is characterized in that will be believed by ARM module Breath is transmitted to DSP module, last screening together is done according to configuration information by DSP module, by the coordinate of collected all targets Target information in required configuration range is only screened output to AMR module compared with configuration information by orientation.