Patent ID: 7307701
Filing Date: 2007-12-11
Classification: F41H,G01S

Abstract:
1. A method comprising: pivotally coupling a housing to a post; transmitting a defined beam of eyesafe laser energy by a window disposed on an upper end of the post, said beam having an azimuth angle of 360°; receiving reflected energy from said beam onto a detector stored in the housing, the detector having a two-dimensional array of detector elements and, in response, forming a two-dimensional image representing a contiguous 360° azimuthal view on the detector; analyzing information in said received energy by an electronic circuit contained in the housing so as to detect the presence of a moving projectile; and tilting, using a weight disposed on a lower end of the post, the post relative to the housing such that angular movement of the housing allows the beam to remain in a generally horizontal orientation.