Abstract: An electronic ranging method and apparatus for determining and optionally displaying in real time the location (or relative position) of as many as one thousand geographically-separated stations or "users" within an operational zone by means of slant range measurement and trilateration. Each "user" is assigned a specific time slot which is precision-synchronized with those of all other users, and this time slot is utilized by the unit to which it is assigned for transmitting a signal which enables range measurements to be obtained with respect thereto by a plurality of other users in its area. The range data thus derived by each user is stored in a memory bank and subsequently transmitted in sequence to one or more master stations, where a computer resolves the received information to establish accurate positional locations of the individual units.
Abstract: 1. A passive ranging system for use by a fighter in determining the dista along the line of sight between the fighter and a target travelling at constant speed; comprising in combination: a search and track system operable to generate signals proportional to the azimuth and elevation angles of the line of sight with respect to the fighter coordinate system, a stabilized platform normally slaved to said search and track system operable to generate signals proportional to the angular rate of rotation of the line of sight and signals proportional to the acceleration of the fighter in inertial space, resolver computer means coupled to said stabilized platform operable to resolve said angular rate and acceleration signals into terms of a reference coordinate system, algebraic computer means connected to said stabilized platform and said resolver computer operable to transform said signals into a voltage form representative of range between the fighter and the target.
Type:
Grant
Filed:
February 20, 1961
Date of Patent:
September 21, 1976
Assignee:
The United States of America as represented by the Secretary of the Navy
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