Passive ranging using image expansion

Passive ranging using image expansion

This paper describes a new technique for passive ranging which is of special interest in areas such as covert nap-of-the-earth helicopter flight and spacecraft landing. This technique is based on the expansion experienced by the image-plane projection of an object as its distance from the sensor decreases. The motion and shape of a small window, assumed to fall inside the boundaries of some obj...

Passive ranging using image intensity and contrast measurement

We have suggested two passive ranging approaches using single camera, intensity and contrast based. According to Beer-Lambert law and known atmosphere extinction coefficient and initial range, the range to moving object is estimated. Using these approaches in a real infrared sequence we obtained better results than by the method based on image size measurements. The relative error of 3.2% for c...

Vision-augmented Gnc: Passive Ranging from Image Flow

Knowledge of range and closing velocity is known to enhance missile guidance, improve launch envelope, and reduce miss; however, scenarios exist where the range-to-target is unknown to the weapon. This paper provides the mathematical framework and algorithm for calculating range-to-target from sequential optical (intensity only) images. Such use of additional information from imaging seekers to...

Passive Ranging Using Infra-red Atmospheric Attenuation Thesis

Passive Ranging Based on IR Radiation Characteristics

In recent years, many researchers have made a lot of works and achieved remarkable results. The system effect distance is deduced from different aspects in [1, 2]. Target range is obtained based on the target movement model in [3]. [4] studies the passive ranging of ground target in mono-static and single band condition based on radiance difference between target and background. Ranging express...