摘要: At present, all forward windscreens (or canopies) installed on Hud-equipped aircraft are measured to determine their angular deviation, or induced aiming error. Standards have been set to accept only those transparencies which cau... 展开 At present, all forward windscreens (or canopies) installed on Hud-equipped aircraft are measured to determine their angular deviation, or induced aiming error. Standards have been set to accept only those transparencies which cause little aiming error, and at least one aircraft HUD fire control computer is provided with a means to compensate for the remaining error. This report is a summary of several of the multitudinous methods used to measure angular deviation for most HUD-equipped aircraft, with an explanation of the comparative accuracy of each method when applied to weapons aiming at operational sighting ranges. The advantages and disadvantages of each quality control system are discussed, and an attempt is made to reconcile the values of each system for sighting accuracy comparisons. A recommendation is made for a standardized method of measurement which is relatively error free, and best relates to operational use of the aircraft. (Author) 收起