1. A method for extraction of ocean bottom parameters in real-time comprising the steps of: periodically determining environmental parameters; periodically determining a sonar system state configuration; periodically obtaining a reverberation energy envelope; monitoring the environmental parameters and the current sonar system state configuration for changes; creating an eigenray computation model in response to changes in the environmental parameters or changes in the sonar system state configuration; generating a reference reverberation model using the eigenray computation model; and characterizing ocean bottom parameters from the reverberation energy envelope by using the eigenray computation model and the reference reverberation model. PG,44