GB1516659A - Correlation system for pseudo-random noise signals - Google Patents

Correlation system for pseudo-random noise signals

Info

Publication number
GB1516659A
GB1516659A GB4363575A GB4363575A GB1516659A GB 1516659 A GB1516659 A GB 1516659A GB 4363575 A GB4363575 A GB 4363575A GB 4363575 A GB4363575 A GB 4363575A GB 1516659 A GB1516659 A GB 1516659A
Authority
GB
United Kingdom
Prior art keywords
signal
phase
time delay
base
suppressed carrier
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
GB4363575A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Motorola Solutions Inc
Original Assignee
Motorola Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Motorola Inc filed Critical Motorola Inc
Publication of GB1516659A publication Critical patent/GB1516659A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03D—DEMODULATION OR TRANSFERENCE OF MODULATION FROM ONE CARRIER TO ANOTHER
    • H03D1/00—Demodulation of amplitude-modulated oscillations
    • H03D1/22—Homodyne or synchrodyne circuits
    • H03D1/24—Homodyne or synchrodyne circuits for demodulation of signals wherein one sideband or the carrier has been wholly or partially suppressed
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/18—Phase-modulated carrier systems, i.e. using phase-shift keying
    • H04L27/22—Demodulator circuits; Receiver circuits
    • H04L27/227—Demodulator circuits; Receiver circuits using coherent demodulation
    • H04L27/2275—Demodulator circuits; Receiver circuits using coherent demodulation wherein the carrier recovery circuit uses the received modulated signals
    • H04L27/2278—Demodulator circuits; Receiver circuits using coherent demodulation wherein the carrier recovery circuit uses the received modulated signals using correlation techniques, e.g. for spread spectrum signals

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Power Engineering (AREA)
  • Radar Systems Or Details Thereof (AREA)
  • Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
  • Noise Elimination (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

1516659 Wave energy position finding MOTOROLA Inc 23 Oct 1975 [18 Nov 1974] 43635/75 Heading H4D In a system, for use e.g. for measuring range between a base and remote station by measuring the delay of a retransmitted signal from the remote station, at the base station, wherein a bi-phase modulated suppressed carrier pseudo-random digitally coded signal is transmitted, the identically coded retransmitted signal having unknown time delay being retrieved at the base station receiver without simultaneous recovery of the suppressed carrier signal, the phase of the retrieved signal being compared with the phase of the transmitted signal to establish the mutual time delay and hence the range to the remote station. In the base-station receiver the received suppressed carrier signal is processed by generating an estimated digital signal having a clock frequency, which is mixed with the received signal, the mixed signal is squared in a frequency doubler circuit, the squared signal then being brought progressively into phase with the estimated digital signal to effect correlation of the estimated signal with the received signal of unknown time delay.
GB4363575A 1974-11-18 1975-10-23 Correlation system for pseudo-random noise signals Expired GB1516659A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US52484774A 1974-11-18 1974-11-18

Publications (1)

Publication Number Publication Date
GB1516659A true GB1516659A (en) 1978-07-05

Family

ID=24090898

Family Applications (1)

Application Number Title Priority Date Filing Date
GB4363575A Expired GB1516659A (en) 1974-11-18 1975-10-23 Correlation system for pseudo-random noise signals

Country Status (5)

Country Link
JP (1) JPS5173397A (en)
DE (1) DE2551559A1 (en)
FR (1) FR2291639A1 (en)
GB (1) GB1516659A (en)
NL (1) NL7513360A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2259820A (en) * 1985-05-20 1993-03-24 Gec Avionics A noise radar

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2259820A (en) * 1985-05-20 1993-03-24 Gec Avionics A noise radar
GB2259820B (en) * 1985-05-20 1993-08-25 Gec Avionics A noise radar
US5291202A (en) * 1985-05-20 1994-03-01 Gec Avionics Limited Noise radars

Also Published As

Publication number Publication date
FR2291639B3 (en) 1978-08-18
JPS5173397A (en) 1976-06-25
NL7513360A (en) 1976-05-20
FR2291639A1 (en) 1976-06-11
DE2551559A1 (en) 1976-05-20

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Legal Events

Date Code Title Description
PS Patent sealed
PCNP Patent ceased through non-payment of renewal fee