GB669856A - Apparatus for determining the time interval between two time-spaced pulses, in which said pulses are members of recurrent series having an equal recurrence rate - Google Patents

Apparatus for determining the time interval between two time-spaced pulses, in which said pulses are members of recurrent series having an equal recurrence rate

Info

Publication number
GB669856A
GB669856A GB16095/49A GB1609549A GB669856A GB 669856 A GB669856 A GB 669856A GB 16095/49 A GB16095/49 A GB 16095/49A GB 1609549 A GB1609549 A GB 1609549A GB 669856 A GB669856 A GB 669856A
Authority
GB
United Kingdom
Prior art keywords
counter
coincidence
count
pulses
feeding
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
GB16095/49A
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.)
RCA Corp
Original Assignee
RCA Corp
Radio Corporation of America
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 RCA Corp, Radio Corporation of America filed Critical RCA Corp
Publication of GB669856A publication Critical patent/GB669856A/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
    • 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
    • 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)
  • Particle Accelerators (AREA)
  • Channel Selection Circuits, Automatic Tuning Circuits (AREA)

Abstract

669,856. Electronic computing apparatus. RADIO CORPORATION OF AMERICA. June 16, 1949 [June 18, 1948], No. 16095/49. Class 106 (i). [Also in Group XL (c)] The invention is concerned with the determination of the time interval between two time-spaced pulses, respectively members of two different series of the same recurrence frequency (see Group XL (c)) and is of particular use in connection with a "Loran " navigation system receiver. A chain of counters is described including count selecting means determining the count before a resetting pulse is generated and thus fixing the recurrence frequency, and further count selecting means determining the delay after the beginning of the recurrence period at which an output pulse is generated. In the embodiment shown 10 is a stable oscillator feeding decade counter 12 which feeds decade counter 13 at a tenth of the frequency. This in turn feeds counter 14 feeding counter 16 feeding binary counter M1 feeding binary counter M2. The final counter M2 is not supplied with resetting pulses and takes no part in the recurrence frequency selection, it serves only to halve the final output frequency as derived over lines 340 and 369. As shown at 12, each decade counter consists of four multivibrators each with two stable conditions. They are so connected that the anode potentials for each unit of the count are as shown in Fig. 6. All of the anodes are connected to switch SIR which when placed to select a given count connects those anodes marked with a small circle on Fig. 6 to coincidence valve 26. Similar switches S2R, S3R, S4R, and S5R and similar coincidence valves 27, 28, 29 and 30 are provided for the other counters and the outputs of all the coincidence valves are fed to a master coincidence valve 33 which generates a resetting pulse when the count to which the switches are set has been reached. The resetting pulse is applied to one member of each multivibrator pair and returns the whole chain to the zero condition. A further set of switches S1D, S2D, S3D, S4D, and S5D, with associated coincidence valves 56, 57, 58, 59 and 60, and master coincidence valve 61 are used to derive output pulses over line 119 adjustably delayed after the beginning of the recurrence period by an amount determined by the switch settings.
GB16095/49A 1948-06-18 1949-01-16 Apparatus for determining the time interval between two time-spaced pulses, in which said pulses are members of recurrent series having an equal recurrence rate Expired GB669856A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US669856XA 1948-06-18 1948-06-18

Publications (1)

Publication Number Publication Date
GB669856A true GB669856A (en) 1952-04-09

Family

ID=22073000

Family Applications (1)

Application Number Title Priority Date Filing Date
GB16095/49A Expired GB669856A (en) 1948-06-18 1949-01-16 Apparatus for determining the time interval between two time-spaced pulses, in which said pulses are members of recurrent series having an equal recurrence rate

Country Status (2)

Country Link
DE (1) DE855585C (en)
GB (1) GB669856A (en)

Also Published As

Publication number Publication date
DE855585C (en) 1952-11-13

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