Using the Digital Signal Simulator

You can use the signal simulator to simulate one or two targets that can occur both in the first trip or the first and the second trip to test the random phase range unfolding feature of RVP.

The simulator creates a time series across all range bins with the same statistics.

Signal

Sets the signal power of the meteorological target (dB).

As you raise this value, the Doppler spectrum of weather increases in power.

If the Signal value is larger than the minimum slider value (---), the Signal, Velocity, and Width parameters define the Doppler Power Spectrum of a weather target with a Gaussian / Normal distribution.

Velocity

Sets the mean radial velocity (m/s) of the weather target normalized between [-1, +1] to correspond to the Nyquist interval (fold point).

As you change this value, the Doppler spectrum moves horizontally.

Width

Sets the spectrum width (standard deviation of velocity) in m/s.

As you change this value, the spectrum become broader.

Clutter

Sets the power (dB) of the clutter signal which has a mean velocity of 0.

As you increase this value, the clutter peak at 0 velocity increases.

The power is calibrated in the same way as the signal power. For example, if both the Clutter and Signal powers are the same, the clutter-to-signal ratio is 0 dB.

Noise

Sets the power (dB) of the white noise present. If --- then no noise added.

Raising this value causes the noise floor to increase.

Tx. Phase

Sets the sequence of phases used to modulate the time series from pulse to pulse:

Coherent - no phase modulation.

Random - random phase sequence.

For more information, see CFGPHZ host computer command in RVP10 User Guide (M212604EN).

Second Trip

Adds a second trip to Target #2.

If Target #2 is in the second trip echo (Second Trip is enabled), the Tx. Phase parameters to give Target #2 a phase shift from Target #1.

RMS Phase

Simulates phase noise. Increasing the phase noise increases the white noise level in the Doppler spectrum.

If the phase from pulse-to-pulse is the same, this setting defines amount of pulse-to-pulse Tx phase modulations of the simulated signal.

Typically, a magnetron radar has between 1 ... 3° of phase noise.

A Klystron system can have as little as 0.1° of phase noise.

RMS Power

Defines the pulse-to-pulse amplitude modulations of the simulated signal.