DEMODULATION CIRCUIT FOR ON-VEHICLE RADAR DEVICE, RADAR RECEIVER FOR ON-VEHICLE RADAR DEVICE USING IT, AND ON-VEHICLE RADAR DEVICE

摘要

PROBLEM TO BE SOLVED: To insure a stable and simple demodulation circuit when a transmitted signal by spread spectrum modulation is received. SOLUTION: A local basic diffusion signal 101 as the same PN mark as the PN mark contained in a transmitted signal and timely regulated is output from a local basic diffusion signal generating part 1, it is multiplied by a IF signal input through an antenna 5, a RF amplifying part 6, and a frequency conversion part 7 so as to demodulate a spread spectrum signal in a diffusion demodulation part 2, and the a spread spectrum demodulation signal 301 is obtained through a BPF 3. Hereafter, the spread spectrum demodulation signal 301 is logarithmically amplified by a logarithmic amplifying detection part 4 so as to obtain video output spreading dynamic range.