COLLISION AVOIDANCE SYSTEM AND COLLISION AVOIDANCE METHOD

A CAS and a collision avoidance method are provided. The collision avoidance method includes: detecting, by a radar, a first detection area and a second detection area to generate a detection result of a target object, where the second detection area includes the first detection area and is greater than the first detection area; determining whether the target object invades the first detection area or the second detection area based on the detection result; in response to determining that the target object invades the second detection area but does not invade the first detection area, calculating a first collision probability based on a first weight and the detection result; in response to determining that the target object invades the first detection area, calculating the first collision probability based on a second weight and the detection result; determining whether to output an alarm message based on the first collision probability.