JPS57192882A - Acquiring method for loran signal - Google Patents

Acquiring method for loran signal

Info

Publication number
JPS57192882A
JPS57192882A JP7825381A JP7825381A JPS57192882A JP S57192882 A JPS57192882 A JP S57192882A JP 7825381 A JP7825381 A JP 7825381A JP 7825381 A JP7825381 A JP 7825381A JP S57192882 A JPS57192882 A JP S57192882A
Authority
JP
Japan
Prior art keywords
wave signal
ground
reception
station
wave
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.)
Pending
Application number
JP7825381A
Other languages
Japanese (ja)
Inventor
Hideki Tanaka
Kenji Ima
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.)
Furuno Electric Co Ltd
Original Assignee
Furuno Electric Co Ltd
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 Furuno Electric Co Ltd filed Critical Furuno Electric Co Ltd
Priority to JP7825381A priority Critical patent/JPS57192882A/en
Publication of JPS57192882A publication Critical patent/JPS57192882A/en
Pending 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
    • 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)
  • Computer Networks & Wireless Communication (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Remote Sensing (AREA)
  • Position Fixing By Use Of Radio Waves (AREA)

Abstract

PURPOSE:To enable acquisition of a ground-wave signal even in a region wherein the conditions of reception are bad, by operating and determining a ground-wave signal acquisition timing of one station on the basis of a ground-wave signal tracking timing of another station and on an information on a current position. CONSTITUTION:When a ground-wave signal, which is decided to be the gound-wave signal on the basis of a wave of a third cycle or the like from a slave station, etc. where the conditions of reception are good, is tracked by a sampling circuit 4, a tracking timing is stored in RAM71 of a microcomputer 7 formed of CPU70, ROM72, RAM71, etc. Then, when an information on a current position is given by NNSS11 or an input key 9, the computer 7 is interrupted and an acquisition timing of a master station or another slave station is computed through operation on the basis of the information on the current position and of a cycle of a set scanning chain and a time of reception and acquisition of a ground wave, which are memorized in RAM71. According to the result of this operation, a real time counter 8, a strobe signal generating circuit 5 and the circuit 4 are controlled, thereby the ground-wave signal is acquired even in a region wherein the conditions of reception are bad, and thus false tracking of an air- wave signal, or the like, is prevented.
JP7825381A 1981-05-23 1981-05-23 Acquiring method for loran signal Pending JPS57192882A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP7825381A JPS57192882A (en) 1981-05-23 1981-05-23 Acquiring method for loran signal

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP7825381A JPS57192882A (en) 1981-05-23 1981-05-23 Acquiring method for loran signal

Publications (1)

Publication Number Publication Date
JPS57192882A true JPS57192882A (en) 1982-11-27

Family

ID=13656828

Family Applications (1)

Application Number Title Priority Date Filing Date
JP7825381A Pending JPS57192882A (en) 1981-05-23 1981-05-23 Acquiring method for loran signal

Country Status (1)

Country Link
JP (1) JPS57192882A (en)

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