Bistatic passive radar system with improved ranging

Abstract

A bistatic passive radar system having a display; a first directional antenna for determining the angle between the reference azimuth of the bistatic passive radar system and the line of sight to a host transmitter; an omnidirectional antenna for receiving reflected radar pulses from targets at any bearing; and a second directional antenna for determining the angle B between the line of sight to the host transmitter and a second line which extends from the bistatic passive radar system to a selected target. The angle of the second directional antenna is indicated by a B cursor on the display. The system includes a bistatic range correction circuit that utilizes an empirical determination of the distance D between the bistatic passive radar system and the host transmitter for determining the correct range for display of a selected target. The distance D is manually varied on the display until the B cursor on the display bisects the video image of a selected target toward which the second directional antenna is pointing. This technique is applicable for all targets and receivers that lie in the plane of rotation of the host radar.

Dependencies are inferred from the claim text.