| 摘要 |
FIELD: physics. ^ SUBSTANCE: first version involves emission of a periodically frequency-modulated probing signal, receiving signals reflected from objects, multiplication of the emitted and received signals, amplification of the resultant homodyne signal, generation of an intermediate-frequency signal from the homodyne signal through linear and analogue to digital conversions, where the said intermediate-frequency signal is in form of a sequence of digital fragments of given duration, generation of a main two-dimensional matrix of base signals and a quadrature matrix, relative the main matrix, the number of columns of which corresponds to the set of average expected range values, the number of rows - set of average expected values of velocity of reflecting objects, calculation of the sequence of main and quadrature matrices of values of mutual correlation functions of matrices of base signals and each of the fragments of the intermediate-frequency signal, detecting objects by detecting matrix elements of mutual correlation functions of any fragment, values of which exceed a given threshold level, and determination of the range and velocity of detected objects from numbers of columns and rows of detected elements, respectively; according to the invention, the emitted periodically frequency-modulated probing signal is attenuated and added to received signals which are reflected by the objects, through linear conversion of digital readings of the obtained intermediate-frequency signal, a reference signal is generated, the mutual correlation function of the base signals and the reference signal is calculated, from which the object with the minimum range is determined, the time shift of the maximum of the mutual correlation function of the base and reference signals is calculated, the main and quadrature matrices of the base signals are corrected based on the determined range values of the detected objects. The second version of the method is characterised by multi-position reception. The first and second versions of the methods are realised using systems made in the corresponding manner. ^ EFFECT: high accuracy of measuring range by eliminating systematic errors in measuring range, and increase in stability of the measured characteristics through synchronisation of analogue and digital parts of the system. ^ 6 cl, 2 dwg |
