METHOD OF DETECTING MARKERS - PARAMETRIC SCATTERERS Russian patent published in 2012 - IPC G01S13/74 G01S13/75 

FIELD: physics.

SUBSTANCE: probing signal is emitted, said probing signal consisting of a sequence of pairs of linked batches of radio pulses of a pumping signal, instantaneous frequency of which varies according to a defined law, and a sequence of pairs of linked batches of doubled auxiliary radio pulses, one of which synchronises the phase of the response signal at the moment of excitation, for which the leading edge of the radio pulse of the pumping signal is emitted at one of the time instants for emitting said synchronisation radio pulse. Said probing signal provides scattering during parametric generation from a wideband parametric scatterer of sequences of wideband response signals, with instantaneous frequency twice less than that of the radio pulses of the pumping signal which, in a receiver, can be compressed to significantly shorter pulses, and there is possibility of coherent accumulation of the received response signal, and auxiliary radio pulses are not accumulated and compensated, for which conditions are provided, where pairs of auxiliary radio pulses are encoded according to an alternative encoding law. That law assumes the lowest level of coherent combination of received signals in a receiver already tuned to receive a signal according to the chosen encoding law. The possibility of emitting auxiliary radio pulses encoded according to an alternative encoding law, and generating radio pulses of a response signal according to the chosen encoding law is provided owing to that, the synchronising radio pulse is either the first or the second of the doubled auxiliary radio pulses, the respective instantaneous frequencies at which synchronisation takes place, different for the first and second synchronisation pulses, and duration thereof can be different. Compensation for auxiliary radio pulses is carried out owing to that each of the linked sequences in pairs has synchronous identical and anti-phase pulses. Also, auxiliary pulses in a pair are anti-phase and must compensated for during compression in the receiver.

EFFECT: high accuracy of determining location of a search object and longer range of the search system.

4 dwg