抄録
The Rectangular Navigation System is the position fixing system by the hyperbolic Line of Position (L.O.P.) and the elliptical L.O.P. which cross at right angles, decided from two stations. It is possible to display in the receiver the standard pulse, whose recurrence rate is the same as that of Loran station, with a very accurate cesium or rubidium oscillator. Distances from both stations can be computed from the time difference between the standard pulse and Loran pulses. Three kinds of L.O.P. are obtained from these distances as follows (see Fig.2): (1) two L.O.P.'s which the distance from each station is constant. -Circles. (2) one L.O.P. which the difference of distances from two stations is constant.-Hyperbola. (3) one L.O.P. which the sum of distances is constant.-Ellipse. Four kinds of position fixing modes are considered using these L.O.P.'s as follows: (1) Range-Range mode (2) Range Hyperbola mode (3) Range-Ellipse mode (4) Rectangular mode The authors compared the accuracy of these four modes with three measurement methods by the probability density of position fix and showed the results in Table 2. It showed that the Rectangular mode is the best system.
