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MEASUREMENT OF WAVE REFRACTIVE INDEX OF IONOSPHERE AND ATMOSPHERIC GAS LAYER VIA FOLLOW-UP OF WAVE PROPAGATION ROUTE AND MEASUREMENT OF RELATIVE POSITION BETWEEN TARGET AND OBSERVATION POINT
MEASUREMENT OF WAVE REFRACTIVE INDEX OF IONOSPHERE AND ATMOSPHERIC GAS LAYER VIA FOLLOW-UP OF WAVE PROPAGATION ROUTE AND MEASUREMENT OF RELATIVE POSITION BETWEEN TARGET AND OBSERVATION POINT
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机译：通过波传播路径的跟踪和目标与观测点之间相对位置的测量来测量电离层和大气层的波折射指数
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摘要
PURPOSE: To accurately measure the cosine of the critical incident angle of a wave to an ionosphere by following up the wave from the position of a satellite assumed on the basis of a wave propagation time therefrom and the approximate value of a vertical distance between horizontal planes across the satellite and an observation point on the ground. ;CONSTITUTION: The virtual point P1 of a satellite (point P) is set on the basis of the approximate value of the 3D position of the point P obtained from a wave transmitted from the satellite, and a linear distance between the point P1 and an observation point A on the ground is divided by a flux (u), thereby establishing a wave propagation time pi. Then, a virtual point P'1 is set on a wave propagation route P1CA with length P1DA kept equal to P'1CA, so that a wave from the point P1 can reach in the propagation time P1. Also, the virtual point P2 of the satellite is established, so as to keep route length P2EA equal to P'1CA, thereby obtaining a vertical distance Lzi. between horizontal planes across the point P2 and the observation point A. As a result, a critical incident angle αio when a wave passing the route P2EA enters the interface of a wave rectilinear propagation layer and an ionosphere, can be detected, thereby improving the measurement accuracy of the 3D position of the satellite.;COPYRIGHT: (C)1995,JPO
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