Flight path crossing distance electronic derivation unit

摘要

The device is for deriving the distance, esp. the crossing distance, of a point on a straight uniform flight path, and derives the angle (alpha) in the flight plane from the initial elevation, current elevation (epsilon) and transverse angle (beta). Flight plane angle information is passed to a computer unit (12) which derives the modular speed and flight variables from which actual distance, crossing distance and speed direction w.r.t. an optional ternary reference system can be obtained. - The required data is optimally filtered by a group of computation units (14-16). A fire direction and targetting system (P56) receives analogue speed and angle information and supplies a voltage corresp. to the crossing distance for rotor computations. An error value is filtered (16) and fed to a controller (18) with the crossing distance value. An imaginary crossing distance value (Rtx) is generated for the initial phase. (1/2) DEAB- DE3244879 C The electronic ranging device provides the momentary distance of a flying object travelling in a straight line, from the observation point using successive values for the observation angle (E) and the azimuth angle (5) provided by a target tracking device and the known or calculated velocity of the object. - Pref. the instantaneous distance is calculated in a processor (10, 12) using a given sinusoidal function in terms of the elevation and azimuth angles and the velocity. The instantaneous distance can then be used to calculate the perpendicular distance of the flight path from the observation point using a second trigonometric formula.