General equations are considered for detecting radar targets against the land surface. These equations possess properties to give in reflection, in addition to the basic frequency f, the same signals at multiple frequencies. Such targets are referred to as nonlinear. The authors apply the equations obtained to the detection of nonlinear targets. Both continuous and impulse modes of operation are considered. The maximum range of a radar operating in a continuous mode is determined by the equation. Targets having a considerable number of metallic contacts at the second harmonic can be detected even better than those at the first harmonic. Thus, if a radar target located at a distance of 30 m has R.C.S. equal to 10 m2 and is located on a sand soil, then the probability of a false alarm equal to 10/sup -4/ it is selected with the probability of correct detection equal to 10/sup -8/. At the same time nonlinear targets against the sand background at the same probabilities, will be selected at a distance of 300 m.
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