Patent ID: 9400323
Filing Date: 2016-07-26
CPC Classification: G01S

Claim Text:
1. A passive radar device, comprising: a direct-wave reception antenna that receives a direct wave that directly arrives at the direct-wave reception antenna after being transmitted from a radio source; a scattered-wave reception antenna that receives a scattered wave transmitted from the radio source and scattered by a target; a direct-wave receiver that divides a received signal of the direct wave into pulses; a scattered-wave receiver that divides a received signal of the scattered wave into pulses; a pulse-by-pulse range compressor that executes cross-correlation processing between the received signal of the direct wave and the received signal of the scattered wave on each of the divided pulses and that calculates a pulse-by-pulse range profile; a block-by-block Doppler processor that calculates a first Doppler frequency spectrum by executing pulse-direction Fourier transform in units of blocks each of which groups a plurality of pulses; a Doppler frequency cell-associated range migration compensator that compensates a range-direction movement amount with respect to the first Doppler frequency spectrum on a Doppler-frequency-cell-by-Doppler-frequency-cell basis and on a block-by-block basis; and a block-direction Doppler processor that calculates a second Doppler frequency spectrum by executing block-direction Fourier transform on an output from the Doppler frequency cell-associated range migration compensator.