Jam resistant communication system

• US 4,247,942 A
• Filed: 03/01/1961
• Issued: 01/27/1981
• Est. Priority Date: 03/01/1961
• Status: Expired due to Term

• Current Assignee: Loral Aerospace Corp. (MHR Holdings LLC (New York))
• Original Assignee: Ford Aerospace & Communications Corporation (Galileo Parent, Inc.)
• Inventors: Hauer, Charles A.
• Primary Examiner(s): Birmiel, Howard A.
• Application Number:
  US04/092,709
• Time in Patent Office: 7,272 Days
• Field of Search: 178/22, 250/8 A, 250/8 T, 250/8.31, 325/32, 328/38, 375/2, 375/25, 375/58, 375/96, 375/110, 455/26, 340/167 B
• US Class Current: 375/242
• CPC Class Codes: H04L 27/02 Amplitude-modulated carrier systems, e.g. using on-off keying; Single sideband or vestigial sideband modulation H04L27/32 takes precedence

Abstract

1. In a communication system, a first delay line having multiple spaced taps, means for supplying successive input pulses to said delay line, whereby in response to each input pulse variously delayed pulses appear at the taps of said delay line, means for deriving from said taps pulses representative of a MARK, means for also deriving from said taps pulses representative of a SPACE, means for selecting the MARK and SPACE representative pulses according to sigal intelligence representable by MARKS and SPACES, means for effecting carrier transmission of the selected pulses, means for receiving the carrier-transmitted pulses, a pair of synchronous detectors, means for supplying the carrier-transmitted pulses to said detectors, means for supplying phase quadrature related local oscillations respectively to said detectors, a second multi-tap delay line which is the conjugate of said first delay line, means for driving said second delay line from said detectors, and means for deriving the transmitted MARK-representative and SPACE-representative pulses from said second delay line.

Claims

1. In a communication system, a first delay line having multiple spaced taps, means for supplying successive input pulses to said delay line, whereby in response to each input pulse variously delayed pulses appear at the taps of said delay line, means for deriving from said taps pulses representative of a MARK, means for also deriving from said taps pulses representative of a SPACE, means for selecting the MARK and SPACE representative pulses according to signal intelligence representable by MARKS and SPACES, means for effecting carrier transmission of the selected pulses, means for receiving the carrier-transmitted pulses, a pair of synchronous detectors, means for supplying the carrier-transmitted pulses to said detectors, means for supplying phase quadrature related local oscillations respectively to said detectors, a second multi-tap delay line which is the conjugate of said first delay line, means for driving said second delay line from said detectors, and means for deriving the transmitted MARK-representative and SPACE-representative pulses from said second delay line.

2. In a communication system, a first delay line having multiple spaced taps, means for supplying successive input pulses to said delay line, whereby in response to each input pulse variously delayed pulses appear at the taps of said delay line, means for deriving from said taps pulses representative of a MARK, means for also deriving from said taps pulses representative of a SPACE, means operable by a binary digital intelligence signal for selecting the MARK and SPACE representative pulses according to the coded intelligence of said signal, means for effecting carrier transmission of the selected pulses, means for receiving the carrier-transmitted pulses, a pair of synchronous detectors, means for supplying the carrier-transmitted pulses to said detectors, means for supplying phase quadrature related local oscillations respectively to said detectors, a second multi-tap delay line which is the conjugate of said first delay line, means for driving said second delay line from said detectors, and means for deriving the transmitted MARK-representative and SPACE-representative pulses from said second delay line.

3. In a communication system, a first delay line having multiple spaced taps, means for supplying successive input pulses to said delay line, whereby in response to each input pulse variously delayed pulses appear at the taps of said delay line, means for deriving from said taps pulses representative of a MARK, means for also deriving from said taps pulses representative of a SPACE, means for selecting the MARK and SPACE representative pulses according to signal intelligence representable by MARKS and SPACES, means for effecting carrier transmission of the selected pulses, means for receiving the carrier-transmitted pulses, a pair of synchronous detectors, means for supplying the carrier-transmitted pulses to said detectors, means for supplying phase quadrature related local oscillations respectively to said detectors, a second multi-tap delay line which is the conjugate of said first delay line, means for driving said second delay line from said detectors, means for deriving from the taps of said second delay line the transmitted pulses representative of a MARK, means for producing a single MARK-representative pulse from the transmitted MARK-representative pulses, means for also deriving from the taps of said second delay line the transmitted pulses representative of a SPACE, and means for producing a single SPACE-representative pulse from the transmitted SPACE-representative pulses.

4. In a communication system, a first delay line having multiple spaced taps, means for supplying successive input pulses to said delay line, whereby in response to each input pulse variously delayed pulses appear at the taps of said delay line, means for deriving the pulses from said taps and for arranging them according to a predetermined code, other means for deriving the pulses from said taps and for arranging them according to another predetermined code, means operable by a digital intelligence signal for selecting the differently-coded pulses, means for effecting carrier transmission of the selected pulses, means for receiving the carrier-transmitted pulses, a pair of synchronous detectors, means for supplying the carrier-transmitted pulses to said detectors, means for supplying phase quadrature related local oscillations respectively to said detectors, a second multi-tap delay line which is the conjugate of said first delay line, means for driving said second delay line from said detectors, code means connected to the taps of said second delay line for deriving pulses corresponding to the first-mentioned coded pulses, and other code means connected to the taps of said second delay line for deriving pulses corresponding to the second-mentioned coded pulses.

5. In a communication system, a first delay line having multiple spaced taps, means for supplying successive input pulses to said delay line, whereby in response to each input pulse variously delayed pulses appear at the taps of said delay line, means for deriving the pulses from said taps and for arranging them according to a predetermined code to represent a MARK, other means for deriving the pulses from said taps and for arranging them according to another predetermined code to represent a SPACE, means for selecting the MARK and SPACE representative pulses according to signal intelligence representable by MARKS and SPACES, means for effecting carrier transmission of the selected pulses, means for receiving the carrier-transmitted pulses, a pair of synchronous detectors, means for supplying the carrier-transmitted pulses to said detectors, means for supplying phase quadrature related local oscillations respectively to said detectors, a second multi-tap delay line which is the conjugate of said first delay line, means for driving said second delay line from said detectors, code means connected to the taps of said second delay line for deriving said MARK-representative pulses, and other code means connected to the taps of said second delay line for deriving said SPACE-representative pulses.

6. In a communication system, a first delay line having multiple spaced taps, means for supplying successive input pulses to said delay line, whereby in response to each input pulse variously delayed pulses appear at the taps of said delay line, means for deriving the pulses from said taps and for arranging them according to a predetermined code to represent a MARK, other means for deriving the pulses from said taps and for arranging them according to another predetermined code to represent a SPACE, means for selecting the MARK and SPACE representative pulses according to signal intelligence representable by MARKS and SPACES, means for effecting carrier transmission of the selected pulses, means for receiving the carrier-transmitted pulses, a pair of synchronous detectors, means for supplying the carrier-transmitted pulses to said detectors, means for supplying phase quadrature related local oscillations respectively to said detectors, a second multi-tap delay line which is the conjugate of said first delay line, means for driving said second delay line from said detectors, code means connected to the taps of said second delay line for deriving a single MARK-representative pulse from the transmitted MARK-representative pulses, and other code means connected to the taps of said second delay line for deriving a single SPACE-representative pulse from the transmitted SPACE-representative pulses.

7. Apparatus for transmitting and receiving a pulse so that it is clearly distinguishable from other pulses that may be received, comprising a first delay line having multiple spaced taps, means for supplying an input pulse to said delay line, whereby time-spaced pulses appear at the taps of said delay line, means connected to said taps for producing a pseudo-random waveform representative of a MARK, other means connected to said taps for producing another pseudo-random waveform representative of a SPACE, means for selecting either of said waveforms for transmission, means for effecting carrier transmission of the selected waveform, means for receiving the carrier-transmitted waveform, a pair of synchronous detectors, means for supplying the carrier-transmitted waveform to said detectors, means for supplying phase quadrature related local oscillations respectively to said detectors, a second multi-tap delay line which is the conjugate of said first delay line, means for supplying the detected waveform to said second delay line, MARK-decoding means connected to the taps of said second delay line, SPACE-decoding means also connected to the taps of said second delay line, and means connected to both of said decoding means for determining whether the received waveform represents a MARK or a SPACE.

8. Apparatus for transmitting and receiving a pulse so that it is clearly distinguishable from other pulses that may be received, comprising a first delay line having multiple spaced taps, means for supplying an input pulse to said delay line, whereby time-spaced pulses appear at the taps of said delay line, means connected to said taps for inverting the polarity of some of said time-spaced pulses according to a predetermined code to produce a pseudo-random waveform representative of a MARK, other means connected to said taps for inverting the polarity of some of said time-spaced pulses according to a different predetermined code to produce another pseudo-random waveform representative of a SPACE, means for selecting either of said waveforms for transmission, means for effecting carrier transmission of the selected waveform, means for receiving the carrier-transmitted waveform, a pair of synchronous detectors, means for supplying the carrier-transmitted waveform to said detectors, means for supplying phase quadrature related local oscillations respectively to said detectors, a second multi-tap delay line which is the conjugate of said first delay line, means for supplying the detected waveform to said second delay line, whereby said waveform appears at each tap of said second delay line, means for inverting the polarity of the waveform appearing at some of the taps of said second delay line according to the first-mentioned code, other means for inverting the polarity of the waveform appearing at some of the taps of said second delay line according to the second-mentioned code, and means for determining whether the received waveform represents a MARK or a SPACE.

9. In a communication system, means for supplying equally time spaced pulses, means responsive to each of said pulses for producing simultaneously two series of pulses, one series comprising positive and negative pulses according to one code to represent a MARK, the other series comprising positive and negative pulses according to another code to represent a SPACE, means for selecting either of said series according to signal intelligence representable by MARKS and SPACES, means for effecting carrier transmission of the selected series, means for receiving the carrier-transmitted series, a pair of synchronous detectors, means for supplying the carrier-transmitted series to said detectors, means for supplying phase quadrature related local oscillations respectively to said detectors, means for deriving the transmitted series of pulses from said detectors, and means for deriving from the transmitted series of pulses a pulse representing a MARK or a SPACE depending on which of the two series of pulses was transmitted.

10. In a communication system, means for supplying equally time spaced pulses, means responsive to each of said pulses for producing simultaneously two series of pulses, one series comprising positive and negative pulses according to one code to represent a MARK, the other series comprising positive and negative pulses according to another code to represent a SPACE, a source of a binary digital intelligence signal, means operable by said signal for selecting either of said series according to the coded intelligence of said signal, means for effecting carrier transmission of the selected series, means for receiving the carrier-transmitted series, a pair of synchronous detectors, means for supplying the carrier-transmitted series to said detectors, means for supplying phase quadrature related local oscillations respectively to said detectors, means for deriving the transmitted series of pulses from said detectors, and means for deriving from the transmitted series of pulses a pulse representing a MARK or a SPACE depending on which of the two series of pulses was transmitted.

11. In a communication system, means for supplying equally time spaced pulses, means responsive to each of said pulses for producing simultaneously two series of pulses, one series comprising positive and negative pulses according to one code to represent a MARK, the other series comprising positive and negative pulses according to another code to represent a SPACE, a source of a binary digital intelligence signal, means operable by said signal for selecting either of said series according to the coded intelligence of said signal, means for effecting carrier transmission of the selected series, means for receiving the carrier-transmitted series, a pair of synchronous detectors, means for supplying the carrier-transmitted series to said detectors, means for supplying phase quadrature related local oscillations respectively to said detectors, means for deriving the transmitted series of pulses from said detectors, means for deriving from the transmitted series of pulses a pulse which is positive or negative depending on which of the two series of pulses was transmitted, and a multivibrator connected to receive said pulse and to reproduce said signal.