GB646358A - Improvement in superheterodyne radio altimeter or locator - Google Patents

Improvement in superheterodyne radio altimeter or locator

Info

Publication number
GB646358A
GB646358A GB18478/45A GB1847845A GB646358A GB 646358 A GB646358 A GB 646358A GB 18478/45 A GB18478/45 A GB 18478/45A GB 1847845 A GB1847845 A GB 1847845A GB 646358 A GB646358 A GB 646358A
Authority
GB
United Kingdom
Prior art keywords
frequency
detector
give
combined
change
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
GB18478/45A
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.)
Marconis Wireless Telegraph Co Ltd
Original Assignee
Marconis Wireless Telegraph 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 Marconis Wireless Telegraph Co Ltd filed Critical Marconis Wireless Telegraph Co Ltd
Publication of GB646358A publication Critical patent/GB646358A/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
    • G01S13/00—Systems using the reflection or reradiation of radio waves, e.g. radar systems; Analogous systems using reflection or reradiation of waves whose nature or wavelength is irrelevant or unspecified
    • G01S13/02—Systems using reflection of radio waves, e.g. primary radar systems; Analogous systems
    • G01S13/06—Systems determining position data of a target
    • G01S13/08—Systems for measuring distance only
    • G01S13/32—Systems for measuring distance only using transmission of continuous waves, whether amplitude-, frequency-, or phase-modulated, or unmodulated

Abstract

646,358. Radiolocation. MARCONI'S WIRELESS TELEGRAPH CO., Ltd. July 18, 1945, No. 18478. Convention date, Oct. 20, 1943. [Class 40 (vii)] In a radiolocation system, employing a frequency - modulated transmission, the reflected signals from aerial 18 are combined in a modulator 17 with oscillations of the desired intermediate frequency produced by a local oscillator 21 and one or both side-bands are combined in a mixer 16 with energy from the transmitting oscillator 10 to give the intermediate frequency. These I.F. oscillations pass through an amplifier 24 to a detector 28 also fed by the source 21 to give a beat frequency corresponding to the change in frequency of the transmitter during the passage of the waves to the object and back. The output of detector 28 is thus a measure of the distance to the object and may give an audible note or operate an indicator 31. The speed of moving objects may similarly be determined, the transmitted waves in this case being of constant frequency and the output of detector 28 representing the change of frequency due to the Doppler effect.
GB18478/45A 1943-10-20 1945-07-18 Improvement in superheterodyne radio altimeter or locator Expired GB646358A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US646358XA 1943-10-20 1943-10-20

Publications (1)

Publication Number Publication Date
GB646358A true GB646358A (en) 1950-11-22

Family

ID=22057281

Family Applications (1)

Application Number Title Priority Date Filing Date
GB18478/45A Expired GB646358A (en) 1943-10-20 1945-07-18 Improvement in superheterodyne radio altimeter or locator

Country Status (1)

Country Link
GB (1) GB646358A (en)

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