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

1996年在相模湾对罗兰-C(Loran-C)西北太平洋链(8930链)的位置线(LOP)形变进行了调查。作为观测结果，定点观测到了S 0.1亩LOP的高重复精度，并明确了相模湾Y、Z站LOP存在较大的局部形变。(1997)为提高LORN-C的定位精度，1997年在龙山湾试行了差分改正法。经校正后，定位误差降至1/10~1/20。由此验证了差分法的有效性。

(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.