sentences:  Halving the distance will cause the signal to noise ratio to increase (improve) by a factor of 16.When the radar is volume clutter limited, however, the variation is an inverse square law and halving the distance will cause the signal to clutter to improve by only 4 times.Since
  
  it follows that
  
  Clearly narrow beamwidths and short pulses are required to reduce the effect of clutter by reducing the volume of the clutter cell.