MOVING TARGET DISCRIMINATION METHOD Russian patent published in 1996 - IPC

FIELD: radar systems. SUBSTANCE: moving target discrimination method includes the following operations: forming, radiating high-frequency electromagnetic energy modulated linearly by increasing frequency during first half-cycle of modulation and by frequency decreasing at the same rate during second half-cycle and receiving signals reflected from target and from terrain features through frequency relative to radiated one (correlation reception). The following operations are new in this method: spectrum analysis of received signals converted at frequency demodulation in succession: first signals of first half- cycle and then signals of second half-cycle. Interrogation of each element of frequency resolution is effected by "herringbone" pattern, i.e. received signals of first half-cycle are interrogated in sequence beginning with central frequency of analysis towards higher frequencies (positive Doppler frequencies), while received signals of second half-cycle are interrogated in sequence beginning with the same central frequency but towards lower frequencies (negative Dopper frequencies). Magnitudes of all interrogated signals are stored fro each half-cycle during several periods of scanning. Magnitude of each interrogated signals is averaged making use of magnitudes of signals taken from memory. Averaged magnitude of respective interrogated signal at receiving signals of first half-cycle is subtracted from averaged magnitude of each interrogated signal at receiving signals of second half-cycle. Used for subtraction are magnitudes of signals whose frequencies are symmetrical relative to central frequency. EFFECT: high suppression of interfering reflections from fixed objects and enhanced discrimination at detecting and tracking the targets (objects) moving at low speed. 2 dwg