Study on the Positioning Accuracy Improvement of North Pacific LORAN-C Chain

04 The Fantasy（1996）罗兰C的（位置线）畸变（远程导航系统-C）西北太平洋链1996年在相模湾对8930链进行了观测，观测结果表明，定点观测到LOP的重复精度高达0.1 μ s，在相模湾Y、Z站的LOP中存在着由长距离陆地传播引起的高达数百米的大规模的大规模的地震。（1997）为了提高LORN-C的定位精度，提出了差分校正方法，并于1997年在立山湾进行了试验。经校正后，定位误差减小到1/10 ~ 1/20。由此验证了微分法的有效性。

(1996)LOP (Line of Position) distortion of LORAN-C (Long Rang Navigation System-C) Northwest Pacific Chain (8930 chain) was investigated at Sagami Bay in 1996.As the results of observation, the high repetition accuracy of 0.1 mu s of LOP was observed athe fixed point, and it was cleared that the large local distortion, which is caused by long land propagation and it attains to some hundred meters, are existing in Y and Z station's LOP at Sagami Bay.(1997)To improve the positioning accuracy of LORN-C,the differential correction method is proposed and tried at Tateyama Bay in 1997. The positioning error decreased to 1/10 - 1/20 values by using the correction. From this results, the efficiency of differential method was verificated.