1. Technical field
This article discusses a set of “smart†anti-collision radars for cars and boats that are selected from a number of patent applications and are independent of each other, have their own technologies, and can meet different environments and application levels.
2. Background Art At present, a large number of automobiles and other motor vehicles have increased, bringing convenience to people's travel and overloading the roads. Vehicles have violated regulations, red lights, overtaking, speeding, and overloading. The road conditions are always in danger and the driving experience is insufficient. The weak awareness of traffic laws and regulations is a security risk. Frequent car accidents cause a large number of casualties and major property losses. It has become a serious social problem in the world. The United States, Europe, Japan and other countries have invested a lot of manpower and material resources to develop advanced collision avoidance radars. Due to the harsh working environment and conditions of the anti-collision radar and the high technical requirements, there are many problems that need to be solved.
Marine shipping and inland rivers, lakes, and rapid development of fisheries have resulted in a large number of ships, as well as more and more congested ports and shipping lanes. In particular, when two or more ships meet, their inertial forces lash off large waves and affect the course of navigation, making it difficult for vessels to manoeuvre correctly. As a result, the ships collided with each other or collided with the bridge piers. In severe cases, sunken ships and even bridges collapsed, and storms and other inclement weather caused even greater accidents. An advanced anti-collision radar is urgently needed to ensure navigation safety.
Analysis of the prior art FM-CW frequency-modulated continuous wave anti-collision radar is limited to the detection of a single target. A single frequency and waveform of the frequency modulation signal is used as a detection signal mark, and it is not possible to simultaneously perform no fuzzy ranging measurement on all targets in the observation area. Multi-target distances are close to each other, and it is difficult to discriminate and distinguish the echo detection data of adjacent target echoes. The adjacent lanes or channel collision radars in the same area interfere with each other, reducing the detection performance and even fail to work properly, making it difficult to cope with complex changes in the driving process. Dangerous situation. Although the random signal continuous wave radar has high anti-interference ability, it is expected to solve the electromagnetic compatibility EMC problem in the same area, but due to radiation leakage from the antenna, blocking echo detection, and distance to the size of the target may collide, distance distance resolution Single force. Reducing the mutual interference in the relative direction, the narrow-beam antenna observation field of view decreases, and there is a blind zone in the road bending. Reflective antennas have high prices, slow sweep speeds, poor anti-vibration and dust-proof, and large loss of microstrip antennas. Simple displays lack panoramic information images. The pulsed radar emits a pulse width to block the blind distance of the echo, which is not suitable for close collision avoidance. There is a lack of rear-vision warnings on the motorways, and they often collide with each other. The existing vehicle-collel anti-collision radar lacks a sensor to form a closed-loop control, lacks an antenna to be difficult to adapt to control and intelligent control of obstacle avoidance, deceleration, and braking, and poor visibility or driving distress cannot timely help drivers solve problems and avoid accidents.
3. General Summary of the Invention The invention of the group is generally set to: use a quasi-optical integrated media lens antenna array to send and receive, digital signal processor DSP converts the beam alert or the channel to alert the target of possible collisions, road conditions or surface imaging, speed sensing, Satellite Positioning GPS Data Microcontroller MCU Controls Time-Division Channel Frequency Modulation or Phase Modulation, Time-Divided Pulse Asynchronous Detection, RF Up-Conversion, R/T, Multiplier and Power Amplifier, Circulator, Beam Switch, Antenna Array Emission, Echo by Antenna Array , Beam switch, circulator, R/T, low noise high-amplifier, sub-harmonic mixer, mid-range, multi-channel signal extraction asynchronous gate selection, and then by I / Q coherent detection, pulse pressure correlation matching filter, A/D conversion, DSP on-chip packet time division multiplexed data rearrangement, fast Fourier transform FFT, distance side lobe suppression, MTI moving target display, constant false alarm handling CFAR, dual port RAM tandem DSP and MCU bus, image Display CRT, sound and light alarm, obstacle avoidance, deceleration, brake, and keyboard access to the MCU via the interface I/O. The target data temporary storage FIFO is transferred to the DSP and MCU for processing and control, and the radar anti-collision function is improved by referring to the road conditions or the water surface. Fully-coordinated mm-wave transmission/reception carrier frequency and intermediate frequency coherent detection, sub-harmonic mixing and frequency-doubling emission, and a small number of devices acquire millimeter wave high carrier frequency resolution.
4. Sub-innovation Features and Benefits
1. Millimeter-Wave Time Division Frequency Modulation Multi-Object Detection Car Collision Avoidance Radar, Patent No. 200810120605.9/200820163087.4, road condition camera combined with the vehicle speed MCU to control n time division pulses, n groups of modulation signal frequencies and waveform agility, and time division n-phase pulse lock FM transmission Simultaneously and quickly determine the distance and speed without obscurity for multiple obstacle targets, the intra-pulse chirp widens the instantaneous bandwidth of the signal, the pulse pressure matching filter, and the high resolution for high signal-to-noise ratio by weighting. The transmitter transmits one target or receives one target. Multiple targets were accumulated. When there is no car in front, the driver will set the speed. When the vehicle appears, the radar will measure the distance and relative movement speed, track the nearest vehicle, control the speed of the vehicle to maintain the safety distance, and identify the stationary vehicle to bypass and avoid rear-end collision.
2. Millimeter-wave time-division passive frequency multi-channel automotive anti-collision radar, patent No. 200810120607.8/200820163089.3, n sets of SAW multi-channel passive chirp, n-channel target echo selects n sets and transmit SAW devices in time-division asynchronous gate Same conjugate matching pulse pressure filter weighting, relatively rapid simultaneous detection of multiple lane targets or single target detection of coherent accumulated data in multiple channels, when a channel signal is interfered or unstable, does not affect the anti-interference ability of other channels normally detected , DSP suppresses the false alarm recognition and the nearest distance from the vehicle, sound and light alarm when deviating from the safe distance, approaching the dangerous distance intelligent obstacle avoidance or deceleration, and braking, which can not easily see the clear obstacle avoidance function for the poor visibility and improve the safe driving.
3. Millimeter-wave random two-phase code phase modulation amplitude modulation automotive anti-collision radar, patent number 200810120601.0/200820163318.1, uses a broadband noise source to generate two mutually independent random symbols, a random code generator A phase modulation ranging / speed, random code Generator B Amplitude-keyed phase modulation carrier frequency secondary modulation, random sequence control receive/send switch, phase modulation/amplitude dual random coding asynchronous detection, enhanced continuous randomness, and the relative direction of adjacent lanes in the same area, allowing With a wide beam antenna, the transmitted signals illuminate and sweep each other. Although the interference signal must enter the receiving channel of the other party, the random signal is the time course of a random variable. The double random code has already been cross-changed and cannot interfere with the target echo-related processing. Interfere with the normal operation of the other radar, coexistence operation, not only has a strong anti-jamming environment electromagnetic compatibility EMC, trailing edge detection to avoid the blind area to block the pulse width, and suppress emission energy leakage, improve the anti-collision radar detection capabilities.
4. Millimeter Time Division Random Code Phase Modulation Multi-Channel Car Collision Avoidance Radar, Patent No. 200810120606.3/200820163088.9, the actual conditions of the road condition combined with the vehicle speed and GPS data MCU control time divided n channels, the SAW Sonic Bandpass Filter selects the code frequency and bandwidth, Sampling and segmentation are associated with each other and are generated independently. The time-division coding is code frequency increasing, the symbol width is decreasing, n-channel multiple random code phase modulation emission, the target distance is increased from far to near, the symbol width linearly narrows, and the distance is longer. The higher the near resolution, the larger the Doppler frequency shift, the clearer the details of the three-dimensional image resolution, the promotion of the excellent electromagnetic compatibility EMC of random signals, and the protection of radar electromagnetic interference from adjacent vehicles to achieve universal application of anti-collision radar to ensure driving safety .
5. Millimeter wave FM multi-channel anti-collision radar for ships, patent No. 200810120373.7/200820163090.6, set the quasi-optical integrated medium lens receiving/transmitting antenna array at the high position of the ship's top or mast, and the DSP code pulse distribution sequence corresponds to the time CRT coordinate converter export identification The location of the target, full alert of the possible collision of the target, by the surface of the waterway camera, own ship speed, satellite positioning GPS data MCU control n time division pulse, n groups of SAW FM time-coded emission, echo selection in the time asynchronous gate selection n Group and launch SAW conjugate matching pulse pressure filtering, DSP spectrum analysis to suppress false alarms, identify the closest distance from the target of the ship, deviate from the safe distance of sound and light alarms, approach obstacle distance to automatically avoid obstacles or deceleration, and it is difficult for drivers with poor visibility to see clearly. The obstacle avoidance function greatly improves the anti-collision performance.
5. Positive effect and significance Intelligent millimeter wave crash radar can alert all-weather all the time, help drivers to eliminate dangerous situations while driving, reduce tension and fatigue, provide comfortable and safe journey for drivers and passengers, reduce driver's misjudgment, embedded GPS provides real-time The current position of the vehicle and ship can be promptly reported and handled if any problem occurs.
When traveling in the same direction, the radar measures the distance and relative movement speed of the car or the boat ahead, and is less than the safety distance alarm. There is a distance that can avoid collision time when approaching the dangerous distance. At this time, the driver can correct the collision by more than 60% of the correct operation. Adaptive control system intelligent anti-collision radar, to avoid collisions is not limited by the driver's mental and physical capabilities, the accuracy rate is greatly improved.
In case of a collision in the opposite direction, the time is the sum of the speeds of the two vehicles, the safety distance is drastically shortened, and the driving quality and experience are required to be higher. The corresponding intelligent anti-collision radar adaptive control system reflects the speed in ms or μs. , is much faster than human reflection, and human control cannot be replaced without mechanical failure.
Intelligent collision avoidance radar provides drivers with the extra time necessary to make correct judgments. Emergency situations can prevent 90% of rear-end collisions and 60% of head-on collisions 1 second ahead of schedule. Obviously, promoting high-tech innovation, promoting social progress and benefiting mankind, embodying the concept of “people-oriented, life firstâ€, preventing the occurrence of traffic accidents and protecting lives, protecting property and spirit from losses, and investing in anti-collision “benign†expenditure far outweighs the high incidence of accidents. The “vicious†expenditures have significantly improved the level of national traffic management, relieved the problem of road overloading, ensured traffic safety, and built a harmonious society for prosperity and development.
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