Showing papers on "Collision avoidance system published in 1994"

Satellite based collision avoidance system

Abstract: This invention provides a method and apparatus to provide coordinated evasive maneuver commands to aircraft to avoid collisions. More specifically, the invention comprises a GPS system to determined the location of aircraft, control logic to calculate evasive maneuvers, display aircraft tracking information, coordinate the evasive maneuver with the intruding aircraft, and give a synthetic voice warning and command to the pilots.

Development of a rear-end collision avoidance system with automatic brake control

Abstract: We have studied active safety technologies from the standpoint of “collision avoidance”. This paper describes a rear-end collision avoidance system with automatic brake control, which avoids a collision to the vehicle in front caused by inadvertent human errors using automatic emergency braking. The system is comprised of four key technological elements, headway distance measurement using scanning laser radar, path estimation algorithm with vehicle dynamics, collision prediction to the vehicle in front by a safe/danger decision algorithm, and longitudinal automatic brake control.

Development of a 60 GHz radar for rear-end collision avoidance

Abstract: In a road collision avoidance system, it is vital to detect with high reliability the distance and approaching speed to an obstacle on the lane in which the vehicle is running. Although laser radar is already used in Japan and microwave radar (24 GHz) in the USA, in order to detect such a distance and approaching speed, there are some problems for both of them-vulnerability to rain, mist, etc. for laser radar applications, and the bulky size, etc. for microwave applications. Millimeter-wave radar systems with excellent environmental resistance and the potential in size reduction have been developed as means to solve such problems, but they have not been used in practice due to the insufficient detection performance, difficulty in on-vehicle installation, cost and so on. This paper discusses a method to improve the detection performance using a new algorithm for digital signal processing and a beam steering method for curved roads, by which remarkable improvements over the conventional system are attained against the false detections of unnecessary objects and failures in detecting necessary objects.

Preceding vehicle and road lanes recognition methods for RCAS using vision system

Abstract: This paper describes the preceding vehicle and road lanes recognition methods for the rear-end collision avoidance system (RCAS) which we are developing. These methods are using an edge histogram method based on the model based vision concept. The edge histogram method can detect line elements of the objects stably with low calculation cost. When the region of interests for the preceding vehicle and road lanes in the image are established and their projected edge histograms are observed in time series order, we can recognize them. Furthermore, we apply Kalman filter to their motions and predict their locations for time series detection. Using this stable recognition, we derive a collision time to control the on-board brake system. We show the performance of these methods by experimental results.

Development of a collision avoidance system with automatic brake control

Abstract: This paper describes a collision avoidance system, which avoids a collision with pedestrians on the road as well as the preceding vehicle caused by inadvertent human errors. The system uses automatic emergency braking. The system is comprised of four key technological elements: headway distance measurement using scanning laser radar, path estimation algorithm with vehicle dynamics, collision prediction to the preceding vehicle by safety/danger decision algorithm, and longitudinal automatic brake control. (A) For the covering abstract see IRRD 868006.

The effect of a collision avoidance system on drivers' braking responses

Abstract: The present experiment was carried out in the BRIMMI project, part of the EUREKA PROMETHEUS program, and investigated drivers' braking responses when equipped with an experimental collision avoidance system (CAS) The effects of two particular factors on the driver's braking point in a collision situation were tested These were the timing of Time-To-Collision (TTC) warnings and the speeds of a following vehicle and target vehicle Subjects were seated in a stationary vehicle and viewed driving scenes projected onto a large screen A graded 'traffic light' display was used, in which the number and color bars changed from green to amber to red with decreasing time headway An auditory warning was also presented as the first red bar appeared Subjects were required to operate the brake pedal to indicate the last moment at which braking must commence in order to avoid collision with the vehicle shown on the video The timing of the CAS warning was varied across clips, appearing at a TTC of 3, 4 or 5 seconds Results showed that braking behavior could be influenced by the presence of a CAS, in that subjects tended to brake earlier when presented with earlier warnings

Fuzzy control system for a mobile robot collision avoidance

Abstract: Mobile robots are widely employed in fully automatic factories and FMS to carry out various kinds of transportation tasks. While they are working mobile robots have to recognize the environment and to avoid colliding-accidents First of all, this paper discuss the principles of ultrasonic ranging. This paper then presents a detecting method by using ultrasonic sensor array and to install the array on a mobile robot. Not only can it detect the distance and the direction from the obstacles but it can also detect the shape of the obstacles. On the other hand in this paper, the actions taken by a human driver to avoid collision accidents while driving a car are analyzed. Based on these analyses, the author proposes to adopt the fuzzy control strategy to design the environment recognition and collision avoidance system for the mobile robots. >

Collision avoidance system

Abstract: PURPOSE: To provide a system for avoiding collision suitable to application to an automobile in which an electronic optical range scanner, recursive reflector provided at the target automobile, and processor unit are included CONSTITUTION: A range scanner 12 applies data related to a distance and angle to a target automobile to a processor 16 The processor 16 monitors the position, speed, and acceleration of each target automobile, and continuously decides and updates the distance, angle, speed, and acceleration of the target automobile and an interval predicted when the route is disturbed by the target automobile When the interval predicted when the route is disturbed is less than a preliminarily set value, an alarming signal or an instruction for avoiding collision are issued