The development of c.w. radio navigation aids, with particular reference to long-range operation

The paper analyses the factors which affect the reliability and accuracy of radio aids to navigation at long ranges. After a brief discussion of the propagation of radio waves likely to be useful for this purpose and some suggestions regarding the best choice of frequency, brief descriptions of various techniques for position fixing with the help of radio waves are given. Pulse modulation is not discussed, except in the final Section of the paper which gives the authors´ views of the advantages and disadvantages of all known radio navigation systems with particular reference to long-range operation.