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Stochastic modulation, passive reflector, optimal receivers, dynamic chaos generator, wideband specter


V.I. Parfenov, V.B. Proskuryakov

The parametrical radiolocation is based on the difference of parameters of the reflected and probe fields. The production of amplitude modulated reflected signal is possible with the use of controllable passive reflectors type diode-dipole. The application domain of these devices is very wide: registration of spatially temporal field distribution, radio beacons in the radio navigation systems, radiotracers for different objects and people. For the increase of noise immunity and detection distance is required the band extension of reflected signal. This is possible with usage of modulator with stochastic output voltage. The developed generator of dynamic chaos for management of the diode-dipole system is produces stochastic output voltage in frequency range of 0 to 1.5 MHz This fact is experimentally confirmed. The principal scheme is based on Colpitz scheme. For the proof of possibility to transport specter of the modulated signal to radiofrequency area, the laboratory stand was builded. This stand consists of the high frequency generator, wide band receiver, diode-dipole system with stochastic generator. The results of experiment proof that the transport of a wide specter from the low frequency area to high frequency area by the diode-dipole system. For the increase of detection distance of radio beacon with wideband stochastic modulation the algorithms of optimal receiving were investigated. The characteristics of detection for different variants of reflected signal’s parameters, known a priori, are being found. The founded characteristics allow to make a reasonable choice of the receive algorithms of signal from passive reflectors in dependence on the information known a priori and the required efficiency of detection.
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