Process and apparatus for improved interference suppression in echo-location and imaging systems

In an echo location or imaging system, generating target range estimates an apparatus providing an improved signal-to-noise ratio, comprising:

• means for generating an elemental waveform w(k);
• means for receiving the elemental waveform w(k) and producing a highly skewed waveform w.sub.s (k) by nonlinear transformation;
• means for transmitting the skewed waveform w.sub.s (k) through a medium containing interference .epsilon.(n);
• and
• means for recovering the target range estimates f(m).

In an echo location or imaging system, generating target range estimates an apparatus providing improved interference suppression and an improved signal-to-noise ratio, comprising:

• means for generating an elemental waveform w(k);
• means for generating a pseudorandom sequence p(n);
• a convolution processor for receiving the elemental waveform w(k) and pseudorandom sequence p(n) and generating a pseudorandomly convoluted waveform s(n);
• means for receiving the convoluted waveform s(n) and generating a skewed convoluted waveform s.sub.s (n) by nonlinear transformation;
• means for transmitting the skewed convoluted waveform s.sub.s (n) through a medium containing interference .epsilon.(n);
• and
• means for recovering the target range estimates f(m).

In an echo-location system wherein a transmitted signal s(n) encounters interference .epsilon.(n), is reflected by a target, and received as a signal r(n), an apparatus for improving the range estimates to the target for any given interference .epsilon.(n), said apparatus comprising:

• means for generating an elemental waveform w(k);
• means for generating a pseudorandom sequence p(n);
• a convolution processor receiving the elemental waveform w(k) and pseudorandom sequence p(n) for generating a pseudorandomly convoluted waveform s(n);
• means for transmitting the convoluted waveform s(n) to a target that reflects the waveform;
• and
• means for receiving the reflected convoluted waveform r(n) which contains an interference component .epsilon.(n) and correlating the reflected signal r(n) with the convoluted waveform s(n) to generate a target range estimate f(m).

In an echo-location system wherein a transmitted signal encounters interference .epsilon.(n), is reflected by a target, and received as a signal r(n), an apparatus for improving the range estimates to the target for any given interference .epsilon.(n), said apparatus comprising:

• means for generating an elemental waveform w(k);
• means for receiving the elemental waveform w(k) and producing a highly skewed waveform w.sub.s (k) by nonlinear transformation;
• means for transmitting the skewed waveform w.sub.s (k) to a target that reflects the waveform w.sub.s (k):
• and
• means for receiving the reflected waveform w.sub.s (k) which contains an interference component .epsilon.(n) and generating a target range estimate f(m) .

In an echo-location system wherein a transmitted signal encounters interference .epsilon.(n), is reflected by a target, and received as a signal r(n), an apparatus for improving the range estimates to the target for any given interference .epsilon.(n), said apparatus comprising:

• means for generating an elemental waveform w(k);
• means for generating a pseudorandom sequence p(n);
• a convolution processor for receiving the elemental waveform w(k) and pseudorandom sequence p(n) and generating a pseudorandom convoluted waveform s(n);
• means for generating an amplitude skewed convoluted waveform s.sub.s (n) by nonlinear transformation;
• means for transmitting the skewed convoluted waveform s.sub.s (n) to a target that reflects the waveform;
• and
• means for receiving the reflected skewed convoluted waveform r.sub.s (n) which contains an interference component .epsilon.(n) and generating a target range estimate f(m).

In a telemetric system exhibiting interference .epsilon.(n), a process for providing interference suppression, the steps of the process comprising:

• generating a pseudorandom convoluted waveform s(n) by convoluting an elemental waveform w(k) with a pseudorandom sequence p(n);
• transmitting the convoluted waveform s(n) through a medium having interference .epsilon.(n);
• and
• recovering the waveform s(n) at a receiving end.

In a telemetric system exhibiting interference .epsilon.(n), a process for providing improved signal-to-noise ratio, the steps of the process comprising:

• generating a highly skewed waveform w.sub.s (k) by nonlinear transformation of an elemental waveform w(k);
• transmitting the skewed waveform w.sub.s (k) through a medium having interference .epsilon.(n);
• and
• recovering the waveform w(k) at a receiving end.

In a telemetric system exhibiting interference .epsilon.(n), a process for providing interference suppression and an improved signal-to-noise ratio, the steps of the process comprising:

• generating a pseudorandom convoluted waveform s(n) by convoluting an elemental waveform w(k) with a pseudorandom sequence p(n);
• generating a skewed convoluted waveform s.sub.s (n) by nonlinear transformation of the convoluted waveform s(n);
• transmitting the skewed convoluted waveform s.sub.s (n) through a medium having interference .epsilon.(n);
• and
• recovering the transmitted waveform s.sub.s (n) at a receiving end.

In an echo-location system wherein a transmitted signal encounters interference .epsilon.(n), is reflected by a target, and received as a signal r(n), a process for providing improved range estimates f(m) to the target for any given interference .epsilon.(n), said apparatus comprising:

• generating a pseudorandom convoluted waveform s(n) by convoluting an elemental waveform w(k) with a pseudorandom sequence p(n);
• generating an amplitude skewed convoluted waveform s.sub.s (n) by nonlinear transformation of s(n);
• transmitting the skewed convoluted waveform s.sub.s (n) to a target that reflects the waveform;
• and
• generating target range estimates f(m) from the reflected received waveform r.sub.s (n).