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US4306240A Expired / Lapsed US ⏱️ 0.0 years remaining

Bearing measuring system for frequency modulation

Assignee: Taiyo Musen Co Ltd
•
Filing: 1979-08-01
•
Granted: 1981-12-15
•
Expires: 1999-08-01
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Abstract

Abstract A bearing measuring system for determining the direction of arrival of a wave by rotating directional antennas or a goniometer to which the directional antennas are connected or rotating the directivity of such directional antennas or goniometer by electric means. The receiver of bearing measuring system of the type disclosed is usually constructed to determine the bearing of an amplitude modulated wave while confirming information about arriving waves. With a single receiver for frequency modulated waves it has been difficult to determine the bearing from adding the outputs of the directional antennas and the output of a nondirectional antenna while confirming information about arriving waves. With the system according to the present invention, it is possible with a single receiver to determine the bearing of the aforementioned frequency modulated waves while confirming information about the waves.

Inventors

  • 👤 Hyo Yasuda
  • 👤 Norio Ikeda

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-11-03 00:57
CPC Classifications
G; G01; G01S; G01S3/00; G01S3/02; G01S3/04; G01S3/12; G01S3/14; G01S3/38; G01S3/42

Claims Analysis

Total Claims: 6
Claim 1
Independent Claim 69 words
A bearing determining system comprising a modulating means for amplitude modulating outputs of directional antennas with at least one low frequency, an additive circuit for superimposing the output of said modulating means and the output of a nondirectional antenna upon each other without phase shift, a frequency modulated wave receiver for receiving the output of said additive circuit and a bearing indicator means sensitive to said frequency modulated wave.
Claim 2
Dependent Claim 69 words
A bearing determining system comprising a modulating means for amplitude modulating outputs of directional antennas with at least one low frequency, an additive circuit for superimposing the output of said modulating means and the output of a nondirectional antenna upon each other without phase shift, a frequency modulated wave receiver for receiving the output of said additive circuit and a bearing indicator means sensitive to said frequency modulated wave.
Claim 3
Dependent Claim 56 words
The bearing determining system according to claim 1, wherein said directional antenna outputs are coupled to a goniometer driven by a servo-motor, said servo-motor being stopped at a position at which the output of said goniometer is reduced to a minimum whereby the bearing to be determined is indicated by a pointer coupled to the goniometer.
Claim 4
Dependent Claim 42 words
The bearing determining system according to claim 1, wherein said directional antenna outputs are coupled to a goniometer continuously rotated at a constant speed for indicating the angular position of said goniometer representing the directivity as an image on a cathode-ray tube.
Claim 5
Dependent Claim 38 words
The bearing determining system according to claim 1, wherein said directional antenna outputs are coupled to a goniometer, said goniometer being manually operated to detect a position thereof, at which the output level of said receiver is minimum.
Claim 6
Dependent Claim 37 words
The bearing determining system according to claim 1, wherein outputs obtained by electrically rotating the directivity with said directional antenna outputs are coupled to a balanced modulator means for displaying the determined bearing on a numerical indicator.

References Cited (Backward Citations)

US3156916A Cited
US3553699A Cited
US3701155A Cited
US3872477A Cited
US3916411A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1984-12-14 1985-06-15 1985-12-15 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1988-12-14 1989-06-15 1989-12-15 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1992-12-14 1993-06-15 1993-12-15 $7700.00 Window Closed / Lapsed

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