Simplified Pointing Equations for Slaving an Antenna to the Radar Coordinates

摘要

The advent of long-baseline radar and missile range instrumentation systems requires a capability to slave two or more antennas together so that they will point physically at the same point in space. Generally, when pencil beams are employed and the separation between antennas is comparable to the slant range of the target, a brute force implementation of the coordi nate transformation equations is required. However, in systems where the separation between antennas is not more than 1/10 of the slant range of the target or so (depending on beamwidth), approximate equations for slaving the antennas together may prove satisfactory. It is the purpose of this paper to derive approximate expressions for the radar coordinates of a target at a slave site in terms of its radar coordinates at a master site. The equations are specialized to the important case where the two sites differ only in longitude, so that it is convenient to apply these equations to obtain the pointing angle corrections introduced by earth rotation. (Author)