Verifying PHIDP and KDP

The PHIDP and KDP processing algorithms can be tested using CW signal sources at IF.

In the alternating-transmitter single-receiver case, a single FM signal generator is modulated with an RVP10 polarization select line so that slightly different frequencies are generated for the H and V pulses. A maximum FM depth of several kilohertz is all that is required.

In the dual-receiver case, two (unmodulated) signal generators are used for each of the H and V intermediate frequencies, and one or the other is detuned slightly from its correct center frequency.

In either case the frequency difference that produces a KDP value of 1.0 degree/km is:

(1.0 \frac{\deg r e e}{k m}) \times (\frac{1}{360} \frac{c y c l e s}{\deg r e e}) \times (299792 \frac{k m}{\sec o n d}) = 833 \frac{c y c l e s}{\sec o n d}