400MHz1波NNSS受信測位精度改善の一方法

概要

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For the effect of the ionospheric and tropspheric Doppler error, the position fixing error by 400MHz (one wave) receiver of NNSS (Navy Navigation Satillite System) is larger than by 150/400MHz (two waves) receiver. Especially the position fixing error of the longitudinal direction is affected by the ionospheric Doppler error at day time. This paper describes a simple method to improve the position fixing error of 400MHz receiver without use of the total electron Contents or electric density distribution of the ionospheric layer. First we obtained the two kinds of the correction curves of the apparent deviation of the antenna height to the local time at the receiving position from the observed data (in a few days) for position fixing of the fixed point. Second the position fixing error of the received data in the last half year were recalculated at the apparent height obtained from these correction curves. The position fixing error (R.M.S.) for the total data numbers 177 at the day time was reduced to about a half value. The features of this method are following ; i) this method is able to carry out with only few additional programs. ii) if position fixing data can be obtained on the ship lying at anchor in a few days there is a possibility of the recorrection for the curve of apparent height anywhere and any season.
社団法人日本航海学会の論文
1978-08-25