Shot noise is produced by electrons in transit across a discontinuity, which occurs in all detectors. Shot noise is the dominant source in most receivers. There will also be flicker noise caused by electron transit through amplification devices, which is reduced using heterodyne amplification. Another reason for heterodyne processing is that for fixed fractional bandwidth, the instantaneous bandwidth increases linearly in frequency. This allows improved range resolution. The one notable exception to heterodyne (downconversion) radar systems is ultra-wideband radar. Here a single cycle, or transient wave, is used similar to UWB communications, see List of UWB channels.
Shot noise is produced by. electrons in transit across a discontinuity, which occurs in all detectors. Shot noise is the dominant source in most receivers. There wil.l also be flicker noise caused by electron transit through amplification devices, which is reduced using heterodyne amplification Another reason for heterodyne processing is that for fixed fractional bandwidth the instantaneous bandwidth increases linearly in frequency. This allows improved range resolution The one notable exception to heterodyne (downconversion) radar syst,ems is ultra-wideband radar. Here a single cycle, or transient wave, is used similar to UWB communications, see List of UWB channels.