How can I convert from voltage TDR into impedance TDR
Based on the circuit below I have built the voltage based TDR diagram.
Then I went to the ADS TDR simulation and constructed by the manual the circuit below.
In the ADS circuit they say that IMPEDANCE=V/I=V/(delta(V)/R)=V*R/Voltage_drop_over_R
I can't see the logic of this formula.
Why does measuring impedance on the left side of the transmission line over time means its the impedance at some location in the transmission line?
None of the symbols in your formula appear in either schematic, so I don’t know what they refer to. However, if V is the voltage drop across a 2-terminal component A in any branch, R is a resistor in the same branch, and I is (voltage drop across R)/R, then it is certainly true that V/I is the impedance at A (the voltage across A divided by the current through A). This does not tell us the impedance anywhere else in the circuit.
For dynamic signals such as Solar Panels and microwave, we sometimes find Ohm's law is useful for incremental resistance as well as the max power theorem and for the mean impedance.
Similarily yet different for a Solar Panel's MPPT operating point.
Another distant relative of this is Load Regulation, where if we know a power supply as 1% load regulation voltage error at some load R , we can imply that the source impedance must be 1% of R.