Time domain radio transmission system

• US 5,812,081 A
• Filed: 06/07/1995
• Issued: 09/22/1998
• Est. Priority Date: 12/03/1984
• Status: Expired due to Term

• Current Assignee: Alereon Incorporated (PNG Telecommunications, Inc.)
• Original Assignee: Time Domain Systems, Inc.
• Inventors: Fullerton, Larry W.
• Primary Examiner(s): Gregory, Bernarr E.
• Application Number:
  US08/480,448
• Time in Patent Office: 1,203 Days
• Field of Search: 375/345, 375/200-204, 375/206-210, 455/76, 380/34, 342/21, 342/22, 342/27, 342/28, 342/118, 342/120, 342/127, 342/132, 342/134, 342/145, 342/201, 324/96
• US Class Current: 342/21
• CPC Class Codes: H01Q 21/061 Two dimensional planar arrays
• CPC Class Codes: H01Q 9/28 Conical, cylindrical, cage, strip, gauze, or like elements having an extended radiating surface; Elements comprising two conical surfaces having collinear axes and adjacent apices and fed by two-conductor transmission lines waveguide horns or mouths H01Q13/00; slot antennas H01Q13/00
• CPC Class Codes: H04B 1/71637 Receiver aspects H04B1/7183 takes precedence
• CPC Class Codes: H04B 14/026 using pulse time characteristics modulation, e.g. width, position, interval
• CPC Class Codes: H04L 27/103 Chirp modulation for spread spectrum techniques H04B1/69

Abstract

A time domain communications system wherein a broadband of time-spaced signals, essentially monocycle-like signals, are derived from applying stepped-in-amplitude signals to a broadband antenna, in this case, a reverse bicone antenna. When received, the thus transmitted signals are multiplied by a D.C. replica of each transmitted signal, and thereafter, they are, successively, short time and long time integrated to achieve detection.

Claims

1. A time domain signaling system comprising:

a receiver for receiving from a medium signals comprising a plurality of time-spaced burst signals which have been coupled to said medium by applying stepped-in-amplitude, abrupt signals from a wideband antenna, and said receiver providing received signals;

a template generator providing pulse template signals at a like time spacing to that of said time-spaced burst signals in said medium;

a coincidence detector responsive to said received signals and said pulse template signals for providing as an output a received pulse when a received signal and a template signal are simultaneously present;

integration means responsive to outputs from said coincidence detector for providing an integral output; and

intelligence output means responsive to said integration means for providing an intelligence output when said integration means has an integrated output resulting from having integrated a plurality of signal outputs from said coincidence detector.

2. A system as set forth in claim 1 wherein said received signals are radar signals.

3. A system as set forth in claim 1 wherein a said template signal is of a curved amplitude character wherein the output of said coincidence detector has a varying gain across a cycle of detection, and said coincidence detector thereby provides gain for an enhanced signal output.

4. A system as set forth in claim 1 wherein said coincidence detector comprises a multiplier.

5. A system as set forth in claim 1 wherein:

said integration means comprises a first integrator for integrating, separately, a plurality of coincidentally detected signals; and

said intelligence output means includes a second integrator responsive to a plurality of outputs of said first integrator for integrating a plurality of outputs of said first integrator, and being insensitive to signals appearing between said signals integrated by said first integrator.

6. A system as set forth in claim 1 wherein said receiver includes means for detecting a plurality of discrete values in time spacing which represent discrete coded levels of intelligence.

7. A system as set forth in claim 6 wherein said plurality comprises two time spacings, one representative of a "1" and the other representative of a "0."