Modeling of Bistatic Scattering with Moving Platforms

The complex frequency response of the ocean is derived for three different bistatic scattering problems. The derivations are based on treating the speed of sound and ambient density of the ocean as constants, and solving for the direct ray path between transmitter and discrete point scatterer, and from discrete point scatterer to receiver. The bistatic scattering problems considered are: 1) no motion, 2) only the discrete point scatterer is in motion, and 3) all three platforms (the transmitter, discrete point scatterer, and receiver) are in motion. The first bistatic scattering problem yields a time- invariant, space-variant complex frequency response while the remaining two bistatic scattering problems yield time-variant, space-variant complex frequency responses. For problems involving motion, the exact time-varying ranges between the transmitter and discrete point scatterer, and between the discrete point scatterer and receiver are derived, and the exact time-varying angles of incidence at the discrete point scatterer, and the exact time-varying angles of scatter at the receiver are also derived. The solutions for the exact time- varying ranges are also valid in an inhomogeneous ocean where the speed of sound and ambient density are functions of position since solving for a range represents a problem in mechanics not wave propagation.Naval Postgraduate School Monterey CA is the author of 'Modeling of Bistatic Scattering with Moving Platforms', published 2002 under ISBN 9781423548713 and ISBN 142354871X.