Precision passive ranging

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 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...

A Precision Analog Voltohmmeter with Automatic Ranging

Navigation Demonstrations of Precision Ranging with the Ulysses Spacecraft

Radio tracking data acquired from the Ulysses spacecraft during its flight to Jupiter were used to test experimental navigational techniques for processing highly accurate (1 to 2 m) two-way ranging data. While ranging data with this level of accuracy have been routinely used for navigation of Earth-orbiting spacecraft, ranging data from interplanetary spacecraft have in the past been artificia...

Precision Passive Mechanical Alignment of Wafers

A passive mechanical wafer alignment technique, capable of micron and better alignment accuracy, was developed, fabricated and tested. This technique is based on the principle of elastic averaging: It uses mating pyramid (convex) and groove (concave) elements, which have been previously patterned on the wafers, to passively align wafers to each other as they are stacked. The concave and convex ...