Abstract
Signal ambiguity in correlation echo-ranging may often be calculated by a correlation process on the envelopes of pulse intensity in a frequency-time diagram. The ambiguity for crossing noise ribbons depends only on the ribbon lengths and the angle of crossing. The mean ambiguity has the same value for crossing lines, and this is the key result of the paper. The ambiguity pattern for touching curved lines is similar to that for touching curved noise ribbons of a definite width. As an example the entire ambiguity diagrams for straight or slightly curved lines may be simply calculated, in both the narrow- and wide-bandwidth cases. Simple formulas are given for the Doppler tolerance and the behavior near Doppler invariance. [Hudson Laboratories of Columbia University Informal Documentation No. 78. Work supported by the U. S. Office of Naval Research.]
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