Millimeter-wave time-division linear frequency modulation multiple-target detection colliding-proof radar for car

Abstract

The invention relates to the technical field of radio fix radars, in particular to a millimetre wave time-division linear frequency modulation multi-object detection automobile anti-collision radar. The radar of the invention adopts full phase parameter receiving / emitting benchmark signal and time-division and time-sequence asynchronous control to receive / emit a dual-purpose quasi-light integrated medium lens antenna array, and scans the objects possible to be collided on the warning road surfaces by DSP according to lane scanning wave beam; the road situation photographing combined with the vehicle speed and GPS data MCU to control time-division n-passage modulation frequency and waveform millimetre wave linear locking phase frequency modulation; emission is carried out sequentially by R / T2, a circulator, a wave beam switch and the antenna array; echo passes through the antenna array, the wave beam switch, the circulator, the R / T1, low noise high amplifier, subharmonic mixing, middle amplifier and a time-dividing circuit and multi-object signal corresponding matching filter wave and is processed and controlled by MCU at DSP; when a plurality of road barriers are encountered, the orientation, distance and relative speed are determined by DSP restriction virtual warning; three-dimensional images are displayed by a CRT; the closer the distance of the object is, the higher the resolution is; the object which is closest to the vehicle is recognised; sound and light alarm are carried out when the distance is less than safety distance; when the distance is near to the dangerous distance, the vehicle can intelligently avoid the barrier or reduce the speed or brake; the radar of the invention can make a choice according to the control reference road situation, the vehicle speed and the GPS data, thus obviously improving the driving safety of the vehicle.

Description

technical field [0001] The invention relates to the technical field of radio wave transmission and reception to detect the azimuth, distance and speed of a target, in particular to a millimeter wave time division linear frequency modulation multi-target detection vehicle anti-collision radar. Background technique [0002] At present, automobiles and other motor vehicles are increasing in large numbers, roads are crowded and overloaded, and traffic accidents occur frequently, causing a large number of casualties and heavy property losses, which have become serious social problems in the world. The United States, Europe, Japan and other countries have invested a lot of manpower and material resources to develop Advanced anti-collision radar, due to the harsh working environment and conditions of automobile anti-collision radar, the collision avoidance process of fast-moving vehicles is extremely short, less than one second, the technical requirements are very high, and there ar...

AI Technical Summary

Problems solved by technology

[0002] At present, a large number of automobiles and other motor vehicles are increasing, roads are crowded and overloaded, and traffic accidents occur frequently, causing a large number of casualties and major property losses, which have become serious social problems all over the world. Advanced anti-collision radar, due to the harsh working environment and conditions of automobile anti-collision radar, the time for fast-moving vehicles to avoid collision is extremely short, less than one second, the technical requirements are very high, and there are many problems to be solved

The antenna uses a horn structure with insufficient horizontal angle resolution, which is even worse when the road is curved. The reflective antenna has a slow sweep speed, anti-vibration, dustproof, and poor corrosion resistance. The failure rate is high and affects the appearance and aerodynamics of the car. Microstrip antenna mm Wave frequency loss is large

In addition, simple radar displays cannot display panoramic information images, and cannot make accurate early warnings for the relative positions, distances, and relative moving speeds of multiple targets.

The pulse system radar transmits pulse width and blocks the echo receiving signal, and there is a blind distance, which is not suitable for close-range anti-collision detection of cars. When a car is driving on the highway without rear-view warning anti-collision radar, there is a possibility of multiple cars rear-end collisions. Weather visibility Time difference is more serious

Existing automotive anti-collision radars lack the function of using sensor signals to form a closed-loop control, lack adaptive control of road environment antennas and intelligent control of automatic obstacle avoidance, deceleration and braking, and poor visibility or driving distress situations that do not help drivers in time to avoid danger and avoid accidents

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