Apart from the new radar products that are based on measurements of reflectivity, the KNMI radars also have the possibility to run in Doppler mode. In the Doppler mode the velocity-component of the waterdroplets in the direction of the radar site can be measured.

The value of product of the maximum detectable velocity and the maximum distance is fixed, and only determined by the wavelength of radiation used by the radar. It is, therefore, relatively easy to operate a Doppler radar at short distances, but to operate a Doppler radar over an area as large as the Netherlands is quite painstaking. There are ways to circumvent this "velocity * distance" limit by using a different pulse sequence (dual PRF). Currently, these techniques introduce (additional) errors in the Doppler signal. Carefull analysis of these errors, development of error correction methods and optimimalisation of the pulse sequences have to be performed before reliable Doppler Radar products can be produced.