Software system to run the AGP-68 fire control radar error budget analysis on IBM PC-XTs

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Software system to run the AGP-68 fire control radar error budget analysis on IBM PC-XTs

Wegner, K.R. / Cohen, D.F.

This paper describes the mechanization, on an enhanced IBM PC-XT, of a computer aided system engineering technique developed for the AN/APG-68 Fire Control Radar. It concentrates on the software developed to perform the data base operations and on the specialized functions required to implement the Error Budget Analysis (EBA). The program operates on the parameters of large, multilevel systems and permits rapid tolerance allocations from higher to lower assembly levels or the determination of effects of lower level changes on performance at the system level. The menu driven software was originally hosted on a minicomputer but the change to a new language on a PC-XT reduced cost, improved versatility and reliability and increased accessability to the various users. Commercial utilities are embedded in the code to manage display operations and to direct file manipulation and access operations. Communications between the PC-XT and a VAX 11/782 system that is used for data backup are also detailed as the overlaying techniques required to accommodate the limited addressing capabilities of the microcomputer. EBA operations discussed include editing, permanent change, made-from, used-on and data output. Several significant constraints imposed by the software packages employed are also mentioned.