V.M. Zhukov

We investigate the noise immunity of multiposition radar (MPRLS). MPRLS used as en-route radar dual-purpose. Detail the features of The complexity of the construction of the FAS in the range of 1.5 - 30 MHz is associated with many conflicting factors, scientific and engineering solutions: the choice of layout elements (odnokoltsevaya, multi-ring, arc lattice); choosing the required number of elements and their location, calculate the required characteristics and parameters of the antenna radiator; charting-forming scheme (DOS), which includes phase shifters and antenna matching devices; development of optimal algorithms for the interaction and matching set of devices and phase shifters; the building design the entire PAR, providing the required mobility and volume requirements. NAM array satisfies the requirements just above 5 MHz. In the lower frequency range (1.5 ... 5 MHz) phased array radiation pattern in azimuth plane almost degenerates into a pie. Proposed to combine the arc and ring structures of FAS: the fre-quency range 5 - 30 MHz phased array built on a circular pattern, and at frequencies of 1.5 - 4 MHz - on the arc. On the results of calculation proposed Kfar substantially exceeds the antenna on a range of VN46/12 and gain. The complexity of constructing a system of automatic adjustment of Kfar is that, in the process of matching elements of the lattice complex coefficients vary between them, and installation required for a given direction NAM phase currents in the elements is the mismatch of the antenna matching devices, ie system is multiply connected. To ensure the sustainability of the automatic settings Kfar proposed numerical algorithm, using measuring instruments of the modulus and phase of complex reflection coefficients.