Learn SDR 08b: Doppler Radar with Pluto SDR
Channel: HarveyMuddPhysicsElectronicsLab
Date: 2022-10-13

Learn SDR with Professor Jason Gallicchio at Harvey Mudd College
Lesson 8b: Doppler Radar!

60mph = 27 m/s   :   2.4e9*27/3e8*2 = 432.0 Hz audio!

3 m/s   :   3.5e9*3/3e8*2 = 70 Hz  you can hear that difference

Antennas and polarization. Long cables to move farther away. Automatic gain control AGC versus manual gain. Parameters of transmitters and receivers.

https://wiki.analog.com/university/tools/pluto/devs/specs  325 MHz - 3.8 GHz, 2.4 Hz LO step size

Don't plug TX directly into RX without a large attenuator and without checking limits. Nearby antennas with an air gap are fine.

Since the same clocks are used, no sync issues.

Watch https://www.youtube.com/watch?v=MViVyocQhVw 

HW: Put the parameters of the Doppler filters on range sliders and explore different center tones and filter widths.

HW: See if you can record fast-moving cars outside (safely).

https://gallicchio.github.io/learnSDR/lesson08b.html

All GNURadio flowgraphs are at:
https://github.com/gallicchio/learnSDR

--- Learn SDR with Professor Jason Gallicchio