The required amount of threshold raising in the case of radar receivers with short sampling intervals

In automatic travel-time measurements in radar operation the output signals of the detector are sampled at periodic intervals and compared with a given decision threshold. The existence of a target is assumed if the threshold is exceeded. It can happen that the threshold is exceeded even in the absence of a target. Such an event leads to error decisions. An investigation is conducted regarding the design of a suitable approach for keeping the number of false alarms constant in the case of a change in the sampling rate, taking into account an appropriate modification of the threshold. Attention is given to the definition of a time-related mean false alarm number, the time-related mean false alarm number in the case of an arbitrary sampling rate, a computational example, and an approximate procedure for the calculation of the threshold.