Accession Number : ADA320869

Title :   Fast Acquisition of Inbound Signals under Low Signal-to-Noise Ratio Conditions in RDSS Systems,

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

Personal Author(s) : Fei, Ye ; Wenfu, Lu

PDF Url : ADA320869

Report Date : 07 JAN 1997

Pagination or Media Count : 23

Abstract : Starting out from the angle of the system as a whole, analysis is carried out with regard to various types of fast acquisition methods, setting up simple, clear, and accurate mathematical models. Application is made of these mathematical models to carry out computer simulation analyses of influences on fast acquisition using pseudo random code, Gaussian limit band noise, and Doppler frequency shift. A number of quantitative and qualitative conclusions are obtained. In conjunction with this, SAW matching filters are indicated as an optimal selection. Besides this, theoretical analyses are also carried out with regard to RDSS standard inbound signal pseudo code synchronous patterns. In conjunction with this, one type of possible acquisition method was conceived.

Descriptors :   *SIGNAL PROCESSING, *SIGNAL TO NOISE RATIO, *NAVIGATION SATELLITES, MATHEMATICAL MODELS, OPTIMIZATION, GLOBAL POSITIONING SYSTEM, SATELLITE COMMUNICATIONS, TRANSLATIONS, SYSTEMS ANALYSIS, MATCHED FILTERS, CHINA, DOPPLER EFFECT, CHINESE LANGUAGE, SPREAD SPECTRUM, SURFACE ACOUSTIC WAVE DEVICES, PSEUDO RANDOM SEQUENCES.

Subject Categories : Radiofrequency Wave Propagation
      Unmanned Spacecraft

Distribution Statement : APPROVED FOR PUBLIC RELEASE