Accession Number : AD0429033


Title :   FLIGHT DATA SYSTEM ORBITAL ERROR ANALYSIS.


Descriptive Note : Engineering rept.,


Corporate Author : LITTON SYSTEMS INC WOODLAND HILLS CALIF


Personal Author(s) : Cohen,L ; Holzapfel,S P


Report Date : Oct 1963


Pagination or Media Count : 78


Abstract : This report consists of three system study reports on the Flight Data System; Inertial Computation Requirements, First Order Orbital Error Analysis, and Analysis of Second Order Gravitational Effects. The Inertial Computation Requirement analysis is divided into two sections. The first section, Pseudo-Coordinate System For Orbital Flights describes the inertial requirements for sub-orbital vehicles. The second section, Computation Requirements For The Flight Data System, details the iteration rates and word lengths required of the central digital computer. The First Order Orbital Error Analysis is predicated on a control system consisting of a high speed digital computer and a four-gimballed gyroscopically stabilized inertial platform mounting three orthogonally oriented accelerometers. The analysis begins with sets of RMS values of path knowledge errors and path control errors, each of which is considered typical of end-ofboost errors. Two control plans are considered: Plan I - Injection and retrofire, partial control, and Plan II - Injection and retrofire, full control. The Analysis of Second Order Gravitational Effects investigates the effect of gravitational anomalies, due to oblateness and non-homogenity, upon satellite polar orbits. (Author)


Descriptors :   COMMAND AND CONTROL SYSTEMS , INERTIAL GUIDANCE , DIGITAL COMPUTERS , ORBITS , SUBORBITAL TRAJECTORIES , ERRORS , MATHEMATICAL ANALYSIS , TRAJECTORIES , ACCELEROMETERS , CONTROL SYSTEMS , INJECTION GUIDANCE , RETRO ROCKETS , DESCENT TRAJECTORIES , ATMOSPHERE ENTRY , NAVIGATION COMPUTERS , GRAVITY , EQUATIONS , ARTIFICIAL SATELLITES , POLAR ORBIT TRAJECTORIES


Distribution Statement : APPROVED FOR PUBLIC RELEASE