Patent US5099246A successfully refreshed from Google Patents.
US5099246A
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US
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Apparatus for determining roll position
Assignee: Saab Bofors AB
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Filing: 1989-05-08
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Granted: 1992-03-24
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Expires: 2009-05-08
Abstract
Abstract An apparatus for determining the roll position of a spinning projectile with the aid of polarized electro-magnetic radiation comprises a transmitter for emitting polarized radiation in a direction towards the projectile and a polarization-sensitive receiver disposed in the projectile for receiving the polarized radiation. The polarized radiation emitted from the transmitter has an asymmetric wave-form which is formed by superimposing at least two mutually phase-interlocked radiation components of the wavelength relationship of 2:1 and/or multiples thereof, and the polarization-sensitive receiver includes a single receiver antenna.
Inventors
- 👤 Lars-Erik Skagerlund
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 21:02
CPC Classifications
F; F41; F41G; F41G7/00; F41G7/20; F41G7/30; F41G7/301; F41G7/305; F41G7/24
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
86 words
An apparatus for determining the roll position of a spinning projectile with the aid of polarized electro-magnetic radiation, comprising a transmitter for emitting polarized radiation in a direction towards the projectile and a polarization-sensitive receiver diposed in the projectile for receiving the polarized radiation, said polarized radiation emitted from the transmitter having an asymmetric wave-form which is formed by superimposing at least two mutually phase-interlocked radiation components of the wavelength relationship of 2:1 and/or multiples thereof, and wherein said polarization-sensitive receiver includes a single receiver antenna.
Claim 2
Independent Claim
86 words
An apparatus for determining the roll position of a spinning projectile with the aid of polarized electro-magnetic radiation, comprising a transmitter for emitting polarized radiation in a direction towards the projectile and a polarization-sensitive receiver diposed in the projectile for receiving the polarized radiation, said polarized radiation emitted from the transmitter having an asymmetric wave-form which is formed by superimposing at least two mutually phase-interlocked radiation components of the wavelength relationship of 2:1 and/or multiples thereof, and wherein said polarization-sensitive receiver includes a single receiver antenna.
Claim 3
Dependent Claim
16 words
The apparatus as claimed in claim 1, wherein the emitted radiation lies within the microwave region.
Claim 4
Dependent Claim
45 words
The apparatus as claimed in claim 1, wherein the received, composite signal is supplied to two threshold circuits with positive and negative threshold levels, respectively, whereby two signals of different pulse frequencies are emitted from which the polarity of the received signal may be determined.
Claim 5
Dependent Claim
59 words
The apparatus as claimed in claim 1, wherein the received radiation components of the composite signal are each supplied to one of two threshold circuits of substantially zero threshold level, and wherein two pulse signals being emitted at the outputs of the threshold circuits are coupled to a D flip-flop adapted to emit an output signal of varying polarity.
Claim 6
Dependent Claim
53 words
The apparatus as claimed in claim 4, wherein said output signal is supplied to a phase comparator in which said output signal is compared with the signal from a counter, the output of the phase comparator being connected through a low pass filter to a voltage-controlled oscillator which is connected to said counter.
Claim 7
Dependent Claim
41 words
The apparatus as claimed in claim 2, wherein the received microwave signal is operative to be mixed with two phase-locked frequencies of the relationship 2:1 and/or multiples thereof from a harmonic frequency-rich local oscillator for obtaining a signal of lower frequency.
Claim 8
Dependent Claim
56 words
The apparatus as claimed in claim 2, wherein the received composite microwave signal is supplied to a mixer in which the signal is mixed with the signal from a harmonic frequency-rich oscillator, to obtain an asymmetric waveform signal of low intermediate frequency from which, after filtering, the roll position of the projectile may unambiguously be determined.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-03-24 | 1995-09-23 | 1996-03-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-03-24 | 1999-09-23 | 2000-03-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-03-24 | 2003-09-23 | 2004-03-24 | $7700.00 | Window Closed / Lapsed |