HOMODYNE RECEIVER AND METHOD FOR OVERCOMING DIRECT CURRENT BIAS NOISE IN HOMODYNE RECEIVER Russian patent published in 2018 - IPC G01S7/03 

FIELD: measurement; test.

SUBSTANCE: invention relates to radar and can be used in automotive vehicles to facilitate operation of safety system components. Disclosed is a homodyne radar system which includes a mixer that outputs a signal having a mixer output frequency that is a frequency difference between two input signals. When the frequency difference is small, low frequency noise may mask the actual signal. Variable phase shifter is added to one of the mixer inputs to change the phase at a predetermined rate of change. Phase shifter shifts the frequency of the input signal so that the mixer output frequency is offset by the predetermined rate. Low frequencies are mapped to frequencies that are above the noise frequencies. Phase shift may be achieved by adding a constant phase at predetermined time intervals. Sampling frequency for the resulting signal may need to be increased to match the higher frequencies.

EFFECT: technical result is to reduce the effect of noise due to DC bias.

20 cl, 6 dwg