منابع مشابه
Visual collision avoidance by segmentation
Visual collision avoidance involves two diicult subprob-lems: obstacle recognition and depth measurement. We present a class of algorithms that use particularly simple methods for each subproblem and derive a set of suu-cient conditions for their proper functioning based on a set of idealizations. We then discuss and compare two diierent implementations of the approach and discuss their perform...
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More than 90% of world trade is transported by sea. The size and speed of ships is rapidly increasing in order to boost economic efficiency. If ships collide, the damage and cost can be astronomical. It is very difficult for officers to ascertain routes that will avoid collisions, especially when multiple ships travel the same waters. There are several ways to prevent ship colli...
متن کاملOptimization-Based Collision Avoidance
This paper presents a novel method for reformulating non-differentiable collision avoidance constraints into smooth nonlinear constraints using strong duality of convex optimization. We focus on a controlled object whose goal is to avoid obstacles while moving in an n-dimensional space. The proposed reformulation does not introduce approximations, and applies to general obstacles and controlled...
متن کاملGeneralized reciprocal collision avoidance
Reciprocal collision avoidance has become a popular area of research over recent years. Approaches have been developed for a variety of dynamic systems ranging from single integrators to car-like, differential-drive, and arbitrary, linear equations of motion. In this paper, we present two contributions. First, we provide a unification of these previous approaches under a single, generalized rep...
متن کاملInverting Wireless Collision Avoidance
We describe grant-to-send, a novel collision avoidance algorithm for wireless mesh networks. Rather than announce packets it intends to send, a node using grant-to-send announces packets it expects to hear others send. We present evidence that inverting collision avoidance in this way greatly improves wireless mesh performance. Evaluating four protocols from 802.11 meshes and 802.15.4 sensor ne...
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ژورنال
عنوان ژورنال: Journal of Navigation
سال: 1971
ISSN: 0373-4633,1469-7785
DOI: 10.1017/s0373463300048384