MIL-PRF-52955D

Abstract

This specification covers an improved position and azimuth determining system, which is an inertial surveying system that may be Global Positioning System (GPS) aided.<b><u>Intended Use:</u></b> The Improved Position and Azimuth Determining System is intended for use in the conduct of field artillery surveys to determine the horizontal coordinates and altitudes of locations critical in the fire control function, such as battery centers, launcher positions, orientating stations, declination stations, target acquisition devices, and survey control points. The system will determine the azimuth of the orienting lines for weapons and target acquisition systems. The system will operate in any geographic area except above 84&#176; north latitude and below 80&#176; south latitude. IPADS may utilize valid GPS data. IPADS will operate when GPS, and other systems relying on radio frequency transmissions, are not available. IPADS will exchange data with the Forward Observer System (FOS) via a wired serial data link. FOS, in turn, exchanges data with fire control nodes via radio communications. The IPADS covered by this specification is military unique because it must operate after exposure to low velocity airdrop, high altitude electromagnetic pulses, and the nuclear, biological and chemical (NBC) warfare environments and subsequent decontamination. Commercial equipment is not designed to withstand such extreme environments and would experience catastrophic failure. IPADS must meet the security requirements for tactical use of GPS, which requires use of military security technology not commercially available.<br>