한국항해학회지 (Journal of the Korean Institute of Navigation)
- 제6권2호
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- Pages.13-33
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- 1982
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- 1225-0481(pISSN)
GPS 에 있어서의 의사잡음위상변조 통신방식에 대한 연구
A Study on PN Phase Modulation Communication System in GPS
초록
The NAVSTAR/GPS is a satellite-based navigation system that will provide extremely accurate three-dimensional position and velocity information to users anywhere on or near the earth. This system has been studied primarly for military use and thus the results of studies are seldom obtainable for civilian use up to date. Expecting this system to be opened to civilian use in the future, this paper aims to the collection of basic data of the PN phase modulated communication system adopted in the GPS system by computer simulation. The results of studies are as follows; 1) The PN phase modulation of the speed of 106b/s can be simulated by Fourier summation, the spectrum region which can be restricted is in the region of 0.5-1.5 MHz and spectrum number required is over than 270. 2) By computer simulation, it is verified that optimum r.f filter bandwidth is about 0.3 MHz for the case of
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