Abstract |

**Interference of Two Co-Generated
Frequency Modulated Parametric Array Signals**

*S.Li, J.Wang (Shanghai Acoustics Lab.,
Acdemia Sinica, Shanghai, China)*

*e-mail:
songwenc@online.sh.cn*

Some
interferential effects of two co-generated modulated parametric array signals
are studied. These effects include the interference of the output of the
matchfilters of the difference frequency signals of two parametric arrays
generated simultaneously by the same transducer. a) One of the two parametric
arrays is forward linear frequency modulated; the other is backward linear
frequency modulated, and the central frequencies of the modulating signals for
the two parametric arrays are the same; b) both of the two parametric arrays
are forward linear frequency modulated, but the central frequencies of
modulating signals for the two parametric arrays are different but quiet near.
Simulation results as well as results of experiment in water and in sand show that
in both situations the interference is tolerable in engineering.

Section
: 11