1/6/2024 0 Comments Dc doppler radarIf your audio is turned up (and your speakers have enough low-frequency response) you can hear the signal from the legs of the jogger at 0:46, which have a low swishing heartbeat sort of rhythm. It gets more tricky when the car gets close and you see it more from the side so you're illuminating the wheel spokes, which complicate things with more modulation, not to mention the detector is to the side of the car's path, so the main return signal droops down in pitch with the cosine of the angle from the detector. Putting the recorded audio into a FFT shows a very clear signal peak, and on this 10.525 GHz module you divide the peak frequency by 31.37 to get speed in mph, so a signal at 953 Hz means the car is going about 30 mph. SUV and truck sized cars) seem to be a big enough target to get over 100 feet of range usually. I did not expect there to be much range, but cars (esp. I took the IF signal direct from the board through a DC-block capacitor into the mic input of my camera, with no preamp or other circuits. Raindrops rarely if ever exist in plentiful enough quantities to produce dBZ values >60 so the culprit is usually hail.For only $7 I figured the HB100 doppler radar module on ebay was worth it to play around with.
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