LDPC (Low-Density Parity-Check Code)-based passive millimeter wave encoding imaging device and method

The invention discloses an LDPC (Low-Density Parity-Check Code)-based passive millimeter wave encoding imaging device and method. The device includes an imaging lens, a rotary driving motor, an encoding template, an exit slit template, a focusing lens, a receiving antenna, a radiometer, a driving motor control component, and a computer. The method includes the following steps that: a target sceneis converged onto the encoding template after passing through the imaging lens; the encoding template modulates the target scene through adopting an LDPC check matrix; modulated signals pass through the focusing lens and are received by the receiving antenna; and the signals are outputted in a voltage form to the computer; the driving motor control component controls the rotary driving motor to change the encoding template, so that next single-channel measurement is performed; after a plurality of times of measurements are performed, a plurality of measurement values are obtained; the measurement values are inputted t