| 摘要 |
FIELD: wireless communications.SUBSTANCE: invention relates to navigation and radar systems and can be used to create non-emitting receiver multiposition radar system, using navigation signals of space navigation system for air target illumination purposes. Nature of invention is that when a weak scattered navigation signal is received a powerful feedforward navigation signal is compensated, which in this case plays a role of a structurally determined interference. To this end when receiving an input as a mixture of high-power direct navigation signal, weak navigation signal diffused in the air, and intrinsic noise of the receiver the first procedure is detection of the powerful direct signal, accurate determination of its parameters, the whole input is stored in memory. Further, an exact copy of the direct signal is formed and subtracted from the recorded input implementation. Result contains only the intrinsic noise of the receiver and the weak scattered signal which is detected in a conventional manner. Impact of the main lobe of the correlation function of a not fully compensated direct propagation of the navigation signal is excluded by limiting the range of possible values of the delay in finding the weak scattered signal, as based on the geometry of the spread of direct and indirect signals, the delay of the scattered signal is always greater than that of the direct signal.EFFECT: achievable technical result is an increase in the probability of correct detection of the navigation signal scattered by the air target.2 cl, 1 dwg |
