Synchronous detection

{
  "id": "MLC-T-MET-002742",
  "term": "Synchronous detection",
  "field": "Meteorology and atmospheric science",
  "definitions": [
    "A signal processing technique used to extract a weak signal of a known frequency from a noisy background by correlating it with a reference signal of the same frequency. Also known as lock-in amplification, it is widely used in remote sensing instruments like radiometers and spectrometers to improve the signal-to-noise ratio. The process involves multiplying the incoming signal by the reference and then applying a low-pass filter to isolate the desired signal's amplitude.",
    "Radar processing that retains the received signal amplitude and phase but that removes the intermediate frequency carrier."
  ],
  "references": [
    "NWS Glossary"
  ],
  "url": "https://mlchart.com/terminology/meteorology/synchronous-detection/"
}