| 摘要 |
<p>A model of the ionosphere for use in the operation of a skywave over the horizon radar is generated by taking a first map of heights of various ionospheric layers against location for at least one value of sunspot number and comparing this to the measured value of the layer height at at least one measurement point and calculating the value of the sunspot number which would give the closest fit of the ionospheric layer heights at that point with the measured value of height and using this calculated value of sunspot number to produce a second map of ionospheric layer heights against location. A respective local correction term is then applied to the height values in the vicinity of those locations on the map at which measurements have been made, the local correction term being derived from the covariance between the heights, the locations of the measured points and the difference between the measured values and the values predicted by the second map at the measurement points.</p> |
