Offset in Object Detection

Question

Dear community, 
 When trying to replicate the experiments to obtain a distance estimation for the 10x10 cm reflector, I encounter a frequency offset such that, for example, when placing an object at 1 meter, the results indicate it is approximately 2.4 meters away. 
 This seems quite strange to me, since when moving the object in discrete increments of 0.5 meters, I obtain the corresponding difference, but it is always shifted in both distance and frequency. 
 The following output is at an approximate distance of 1 meter with a value of 2.6 meters. 
 
 The following output is at an approximate distance of 2 meter with a value of 3.63 meters.

Jon.Kraft · Accepted Answer

Yes, you need to calibrate it for 0m. As there is some frequency inaccuracy from setup to setup. But you should see that the difference between 1m and 2m, etc, is the correct calculated beat frequency.)

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Offset in Object Detection