In radiolocation with the synthesized aperture the modulation of the probing signal using the pseudorandom sequences is actively used. This, as a rule, is due to tendency of the apparatuses miniaturization and simplification. The problem of increasing the dynamic range of the radar image of a region, obtained with synthetic aperture radar, has been considered. While using the pseudorandom sequences as the probing signals the dynamic range of an image has been determined by the level of side lobes of aperiodic autocorrelation functions (ACF). An original approach to reduce the level of the ACF pseudorandom sequences has been proposed. An analytic derivation of the sum of ACFs of N length pseudorandom sequence, obtained with a cyclic shift of the initial sequence, which side peaks of periodic ACF are equal to -1/ N , has been presented. The obtained result can be used in a radar design to form an ensemble of signals to provide a significant suppression of the integral side lobes level in comparison with a single sequence.
Vadim A. Kozlov
JSC «Center of Perspective Technologies and Devices», Moscow, Russia
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