| 摘要 |
FIELD: radiolocation, coherentpulse radars intended for ship navigation and aerospace identification of ships. SUBSTANCE: at first stage of selection radio pulses with constant carrier frequency are emitted, reflected signals are received. Complex envelopes of Doppler frequency signals on M frequency components equidistant from each other are range-filtered for each element of resolution. Their powers are measured, results of measurements are compared with threshold level and preliminary decision on presence of signal from true target is made if powers of at least one but not more than K adjacent frequency components exceed threshold level. Then second stag of selection starts during which coherent radio pulses are emitted in the course of n periods of repetition on carrier frequency fretuned from period to period through m values, signals reflected from targets assumed as true ones at first stage are received. Procedure of coherent accessing and Doppler frequency filtration of complex envelope on each of m carrier frequencies correspondingly in m channels is carried out. Maximum value of power of frequency components in each of m channels is determined, by mathematical dependence averaged values of modules of differences of maximum values of frequency components are found and compared with threshold value with excess of which final decision on presence of signal from true target is made. EFFECT: increased authenticity of process. |
