MEASUREMENT OF RADIO-WAVE REFRACTIVE INDEX OF ATMOSPHERE GAS LAYER AND IONIZATION LAYER ONLY DUE TO RADIO-WAVE PROPAGATION TIME

PURPOSE:To eliminate the positional error of a satellite or the error generated by an ionized layer and atmosphere gas layer and to enhance measuring accuracy by receiving a radio wave from the satellite and measuring the radio-wave propagation time and vertical distance between an observation point and the satellite and calculating the incident angle of a radio wave using a specific formula. CONSTITUTION:A radio wave is received from a satellite and the radio-wave propagation time and vertical distance between an observation point and the satellite are measured. The calculated data are substituted for formula to calculate the incident angle of the radio wave at the time when the radio wave received at the observation point enters the interface of a radio-wave straight advance layer and an atmosphere gas layer. In the formula, cosalphaio is the incident angle of the radio wave at the time when the radio wave enters the interface of the radio-wave straight advance layer and the atmosphere gas layer and phi a is the inclination of a kij-nij characteristic curve when the incident angle of the radio wave to the interface of the radio-wave streight advance layer and the atmosphere gas layer is changed in a phi deg.unit within a certain angle region and phic is the inclination of a kijnij-nij characteristic curve when the incident angle of the radio wave to the interface of the radio wave straight advance layer and the atmosphere gas layer is changed in a phi deg. unit within a certain angle region and h is the thickness of the plane layer parallel to the horizontal surface passing the observation point.