Abstract: A polyester pocket with a clear front and back is provided. A spun-bonded polyester strip is positioned near the open end of the polyester pocket to prevent atmospheric contaminants from entering the polyester pocket. The spun-bonded polyester strip also allows the polyester pocket to lay flat when multiple polyester pockets are stacked upon one another. The thickness of the spun-bonded polyester can be made to roughly correspond to the thickness of documents inserted into the polyester pocket.

Abstract: A process is provided for establishing when selected pairs of airborne aircraft are in en route conflict or are in potential en route conflict. The process includes a number of "filtering" steps arranged in three branches. At each step, different conditions, such as height separation, lateral separation, height convergence, lateral convergence and "look-ahead" projections are examined for each aircraft pair. Criteria are established for each "filtering" step such that aircraft pairs not passing the filter to the next step are exited as either "no conflict", "current conflict" as "potential conflict". Sixteen such filtering steps are provided, one of which establishes a "current conflict" status and four of which establish a "potential conflict" status.

Abstract: The positions of a plurality of targets (26) are located using three or more sensors (20, 22, 24) such as radars which sense only the bearing angle of the targets. The intersecting bearing lines (30) form triangles (28) representing both true targets (26) and false targets (28). The false target triangles (28) are separated from the true target triangles by analyzing the size and position of each triangle. Bearing data defining the triangles is first ordered and then sequentially examined in a manner such that a first group of false targets (28) is eliminated from consideration. The bearing data defining the remaining triangles is processed through coarse and fine gates to eliminate second and third groups of false targets (28). A fourth group of false targets (28) is eliminated by using a global maximum likelihood procedure, in which a likelihood function is maximized through the use of discrete optimization techniques.