This review is concerned with the relative potentials of various experimental radio techniques from the point of view of determining the atmospheric fine‐scale structure. After having derived a unified set of simple approximate expressions for the ‘measured quantity’ in terms of parameters describing the refractive‐index time‐space structure, some of the more important sources of error are discussed. Finally, on the basis of numerous experimental results, the form of the refractive‐index spectrum is deduced by using the previously derived theoretical expressions.
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