Accession Number : ADA304350

Title :   A Problem with Exterior Ballistic Measurements - An Exploration of (NS Level Precision) Group Delay Measurement Methods,

Corporate Author : NATIONAL AIR INTELLIGENCE CENTER WRIGHT-PATTERSON AFB OH

Personal Author(s) : Luo, Bixian ; Luo, Jian

PDF Url : ADA304350

Report Date : 07 DEC 1995

Pagination or Media Count : 23

Abstract : This article makes a simple description of GPS (global positioning system) positioning precisions as well as its measurement methods. It elucidates test measurement levels reached domestically and existing problems. It puts forward effective pulse modulation and demodulation technologies to determine test measurement precisions and opts for the use of measurement duration intervals to replace phase measurements. This is capable of effectively making systems with the same frequencies and different frequencies reach ns level group delay measurement precisions. In conjunction with this, it gives test measurement method schematic diagrams as well as key equipment and explains that this system is capable of resolving a difficulty associated with GPS system zero calibration. (AN)

Descriptors :   *GLOBAL POSITIONING SYSTEM, *EXTERIOR BALLISTICS, SIGNAL PROCESSING, SIGNAL TO NOISE RATIO, PRECISION, ARTIFICIAL SATELLITES, DELAY, TRANSLATIONS, CALIBRATION, RANGE FINDING, FLIGHT PATHS, DEMODULATION, CHINA, SPACE NAVIGATION, PULSE MODULATION, RADIO NAVIGATION, PHASE SHIFT, CHINESE LANGUAGE, TELEMETER SYSTEMS.

Subject Categories : Air Navigation and Guidance
      Space Navigation and Guidance

Distribution Statement : APPROVED FOR PUBLIC RELEASE