Range information from signal distortions
First Claim
1. A method for range determination in a lossy medium, comprising the steps of:
- radiating an electromagnetic pulse into the lossy medium;
receiving a distorted electromagnetic pulse reflected from a target at a distance in the medium;
determining the range of the target by comparing the received pulse to a plurality of distorted sample pulses each representing a different travel distance through the medium, without regard to travel time through the medium and without determination of any pulse arrival time.
1 Assignment
0 Petitions
Accused Products
Abstract
An electromagnetic signal having originally the time variation of a rectangular pulse is transmitted into a medium with conductivity σ. It is distorted by the medium to a signal f(σ,d,t) if it traveled the distance d from a transmitter to a scattering or reflecting object and the same distance d back to the transmitter. The time variation f(σ,d,t) of the distorted signal can be calculated for any conductivity σ and distance d. Using the conductivity σ known from previous measurements, the returned, distorted signal f(t) is compared with computed distorted signals f(σ,d,t) for various distances d. The computed signal f(σ,d,t) that is most similar to the actually received signal f(t) determines the distance d to the scattering or reflecting object. The comparison between the computed, distorted signals and the actually received signal is done by cross-correlations. The peak amplitude or the energy of the received signal becomes unimportant if cross-correlation is used, which means the physical size or radar cross-section of the scattering or reflecting object becomes unimportant.
-
Citations
13 Claims
-
1. A method for range determination in a lossy medium, comprising the steps of:
-
radiating an electromagnetic pulse into the lossy medium; receiving a distorted electromagnetic pulse reflected from a target at a distance in the medium; determining the range of the target by comparing the received pulse to a plurality of distorted sample pulses each representing a different travel distance through the medium, without regard to travel time through the medium and without determination of any pulse arrival time. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
-
Specification