Spread spectrum coherent processor

• US 5,265,121 A
• Filed: 11/14/1991
• Issued: 11/23/1993
• Est. Priority Date: 10/17/1989
• Status: Expired due to Fees

• Current Assignee: Juanita H. Stewart
• Original Assignee: Juanita H. Stewart
• Inventors: Stewart, Clarence H.
• Primary Examiner(s): CANGIALOSI, SALVATORE A
• Application Number:
  US07/791,670
• Time in Patent Office: 740 Days
• Field of Search: 375/1, 375/57, 375/99
• US Class Current: 375/346
• CPC Class Codes: H04B 1/709 Correlator structure
• CPC Class Codes: H04B 1/713 using frequency hopping

Abstract

A delay device for delaying a received signal as a delayed-received signal, and a correlator for estimating a phase angle between the received signal and the delayed-received signal. A parametric encoder estimates a phase angle between the received signal and a delayed-received signal.

Claims

1. A method for inference detecting a received signal in noise, comprising the steps of:

coherently summing a plurality of samples of the received signal;

generating a correlation function phase signal, from the summed plurality of samples of the received signal, using a correlator phase detector;

phase centroiding, using a signal device, the correlation function phase signal to generate a phase centroid estimate vector;

comparing, using a comparator, a scalar value of the phase centroid estimate vector to background noise to detect the received signal.

2. The method as set forth in claim 1, further including the step of coherently running multiple signal events by vector addition of a plurality of phase centroid estimate vectors of a plurality of independent signal events.

3. An apparatus for inference detecting a received signal in noise, comprising:

means for generating from the received signal a plurality of samples of the received signal;

a correlation phase detector for generating, from the plurality of samples of the received signal, a correlation function phase signal;

a signal device for phase centroiding the correlation function phase signal to generate a phase centroid estimate vector; and

a comparator for comparing the phase centroid estimate vector to background noise to detect the received signal.

4. The method as set forth in claim 3, further including means for coherently running multiple signal events by vector addition of a plurality of phase centroid estimate vectors of a plurality of independent signal events.