Description: Possibility of recognition of quantitative composition of group aim, лоцируемой above a sea on distance of exceeding distance line-of-sight is analysed in the article. As a sign, allowing to recognize a group aim, it is suggested to use the change (jump) of parameters of эхо-сигналов. To the number such parameters in a radio-location use amplitude, Doppler translation of frequency and phase of the signal reflected from an aim. From position of analysis of matrix of conditional probability of fixing of jump of parameter of signal, the possible variants of construction of devices of finding out quantitative composition of group aim are in-process considered and their efficiency is appraised depending on the number of parameters of эхо-сигнала on the jump of which quantitative composition of group aim is estimated.
Keywords: group goal, parameters echo signal, matrix of conditional probabilities, the probability of the desired alarm, the probability of correct detection