GB2016851A - LORAN-C navigation apparatus - Google Patents

LORAN-C navigation apparatus

Info

Publication number
GB2016851A
GB2016851A GB7840831A GB7840831A GB2016851A GB 2016851 A GB2016851 A GB 2016851A GB 7840831 A GB7840831 A GB 7840831A GB 7840831 A GB7840831 A GB 7840831A GB 2016851 A GB2016851 A GB 2016851A
Authority
GB
United Kingdom
Prior art keywords
loran
signals
arrival
navigation
received
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.)
Granted
Application number
GB7840831A
Other versions
GB2016851B (en
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.)
Lockheed Martin Corp
Original Assignee
Sanders Associates 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 Sanders Associates Inc filed Critical Sanders Associates Inc
Publication of GB2016851A publication Critical patent/GB2016851A/en
Application granted granted Critical
Publication of GB2016851B publication Critical patent/GB2016851B/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S5/00—Position-fixing by co-ordinating two or more direction or position line determinations; Position-fixing by co-ordinating two or more distance determinations
    • G01S5/02—Position-fixing by co-ordinating two or more direction or position line determinations; Position-fixing by co-ordinating two or more distance determinations using radio waves
    • G01S5/10—Position of receiver fixed by co-ordinating a plurality of position lines defined by path-difference measurements, e.g. omega or decca systems
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S1/00—Beacons or beacon systems transmitting signals having a characteristic or characteristics capable of being detected by non-directional receivers and defining directions, positions, or position lines fixed relatively to the beacon transmitters; Receivers co-operating therewith
    • G01S1/02—Beacons or beacon systems transmitting signals having a characteristic or characteristics capable of being detected by non-directional receivers and defining directions, positions, or position lines fixed relatively to the beacon transmitters; Receivers co-operating therewith using radio waves
    • G01S1/08—Systems for determining direction or position line
    • G01S1/20—Systems for determining direction or position line using a comparison of transit time of synchronised signals transmitted from non-directional antennas or antenna systems spaced apart, i.e. path-difference systems
    • G01S1/24—Systems for determining direction or position line using a comparison of transit time of synchronised signals transmitted from non-directional antennas or antenna systems spaced apart, i.e. path-difference systems the synchronised signals being pulses or equivalent modulations on carrier waves and the transit times being compared by measuring the difference in arrival time of a significant part of the modulations, e.g. LORAN systems
    • G01S1/245—Details of receivers cooperating therewith, e.g. determining positive zero crossing of third cycle in LORAN-C

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Remote Sensing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Position Fixing By Use Of Radio Waves (AREA)

Abstract

LORAN-C navigation apparatus is disclosed wherein digital circuitry and a microprocessor is used to automatically identify LORAN transmitting stations and makes standard hyperbolic navigation measurements. The equipment operator manually enters the group repetition rate into the apparatus for a LORAN-C chain covering the area within which the navigation apparatus is being operated. Initially, the apparatus searches all incoming signals until signals from a master station are received regularly at the stored group repetition rate. The apparatus then closely determines the time of arrival of signals from the secondary stations of the selected LORAN-C chain before changing to a fine search mode in which the exact time of arrival of the secondary station signals is determined; the phase code of the received signals is checked to determine if the received signal is a ground or sky wave, and a determination is made if there is a defective secondary station blink code. The time difference of arrival measurements am then output visually to be plotted in a well known manner on a LORAN-C chart to locate the position of the craft upon which the apparatus is located. <IMAGE>
GB7840831A 1977-10-17 1978-10-17 Loran-c navigation apparatus Expired GB2016851B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US84270677A 1977-10-17 1977-10-17

Publications (2)

Publication Number Publication Date
GB2016851A true GB2016851A (en) 1979-09-26
GB2016851B GB2016851B (en) 1982-05-19

Family

ID=25288055

Family Applications (1)

Application Number Title Priority Date Filing Date
GB7840831A Expired GB2016851B (en) 1977-10-17 1978-10-17 Loran-c navigation apparatus

Country Status (9)

Country Link
JP (1) JPS55452A (en)
CA (1) CA1124820A (en)
DE (1) DE2843956C2 (en)
FR (1) FR2406205A1 (en)
GB (1) GB2016851B (en)
IT (1) IT1106209B (en)
NL (1) NL7810402A (en)
NO (1) NO153275C (en)
SE (1) SE440152B (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0050493A1 (en) * 1980-10-20 1982-04-28 Megapulse Incorporated Radio navigation method and system using transmission of pulse groups by a plurality of stations
US11768269B2 (en) 2019-01-18 2023-09-26 Exalocus Oy Positioning based on signal propagation time difference

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3038042A1 (en) * 1980-10-08 1982-05-13 Sanders Associates, Inc., Nashua, N.H. METHOD AND DEVICE FOR SELF-CALIBRATING A LORAN-C RECEIVER
JPS57172264A (en) * 1980-11-26 1982-10-23 Sanders Associates Inc Self-calibration method of and apparatus for loran c receiver
JPS57109415A (en) * 1980-12-26 1982-07-07 Sony Corp Voltage control tuning circuit

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1315698A (en) * 1970-09-28 1973-05-02 Decca Ltd Systems for identifying phase coded groups of radio frequency pulses
US3921076A (en) * 1973-03-08 1975-11-18 Int Navigation Corp Method of and apparatus for locating predetermined portions of a radio-frequency pulse, particularly adapted for leading edge location of loran and similar navigational pulses
US3868691A (en) * 1973-04-13 1975-02-25 Epsco Inc Loran receiver automated master search
US3947849A (en) * 1974-06-20 1976-03-30 The Johns Hopkins University Loran receiver-navigator
US4104635A (en) * 1976-11-12 1978-08-01 Sanders Associates, Inc. LORAN-C navigation apparatus

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0050493A1 (en) * 1980-10-20 1982-04-28 Megapulse Incorporated Radio navigation method and system using transmission of pulse groups by a plurality of stations
US11768269B2 (en) 2019-01-18 2023-09-26 Exalocus Oy Positioning based on signal propagation time difference

Also Published As

Publication number Publication date
NO153275B (en) 1985-11-04
NO153275C (en) 1986-02-12
SE7810714L (en) 1979-04-18
JPS6131829B2 (en) 1986-07-23
SE440152B (en) 1985-07-15
CA1124820A (en) 1982-06-01
DE2843956A1 (en) 1979-04-19
JPS55452A (en) 1980-01-05
NO783501L (en) 1979-04-18
FR2406205A1 (en) 1979-05-11
GB2016851B (en) 1982-05-19
DE2843956C2 (en) 1985-03-14
NL7810402A (en) 1979-04-19
FR2406205B1 (en) 1985-04-19
IT7851546A0 (en) 1978-10-17
IT1106209B (en) 1985-11-11

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Legal Events

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

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