Billingsley’s intrinsic clutter motion (ICM) model
P = billingsleyicm(fd,fc,wspeed)
P = billingsleyicm(fd,fc,wspeed,c)
calculates the clutter Doppler spectrum shape,
P = billingsleyicm(
P, due to intrinsic
clutter motion (ICM) at Doppler frequencies specified in
arises when wind blows on vegetation or other clutter sources. This function uses
Billingsley’s model in the calculation.
fc is the operating
frequency of the system.
wspeed is the wind speed.
Doppler frequencies in hertz. This value can be a scalar or a vector.
Operating frequency of the system in hertz.
Wind speed in meters per second.
Propagation speed in meters per second.
Default: Speed of light
Shape of the clutter Doppler spectrum due to intrinsic clutter motion. The
vector size of
Calculate and plot the Doppler spectrum shape predicted by the Billingsley ICM model. Assume the PRF is 2 kHz, the operating frequency is 1 GHz, and the wind speed is 5 m/s.
v = -3:0.1:3; fc = 1e9; wspeed = 5; c = physconst('LightSpeed'); fd = 2*v/(c/fc); p = billingsleyicm(fd,fc,wspeed); plot(fd,pow2db(p)) xlabel('Doppler frequency (Hz)') ylabel('P (dB)')
 Billingsley, J. Low Angle Radar Clutter. Norwich, NY: William Andrew Publishing, 2002.
 Long, Maurice W. Radar Reflectivity of Land and Sea, 3rd Ed. Boston: Artech House, 2001.
Usage notes and limitations:
Does not support variable-size inputs.