Method of producing continuous, orthogonal signals and method of their use for examining and for detecting changes in a body

Abstract

Each of N continuous orthogonal signals are generated by summing a plurality of constituent sine waves together, where each of the sine waves has a known and mutually exclusive frequency and, the sine waves have a random or pseudo random phase where no two of the N signals includes a constituent sine wave of the same frequency. Each of the constituent sine waves has a prime number integer frequency. A body can be examined by transmitting the N continuous orthogonal signals into the body and providing one of the receivers for receiving the N signals including reflections of the N continuous signals from one or more reflectors within the body. The signals received at each of the receivers is recorded. The travel-time to the reflectors for each of the N signals at each of the receivers is determined by cross correlating each of the N signals with each of the recorded signals at the receivers. The travel-time can be used to derive an image of the body.

Dependencies are inferred from the claim text.