Patent EP0343131A2 successfully refreshed from Google Patents.
EP0343131A2
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EP
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An apparatus for determining roll position
Assignee: Saab Bofors AB
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Filing: 1989-04-28
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Granted: —
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Expires: 2009-04-28
Abstract
Abstract The present invention relates to an apparatus for determining the roll position of a spinning projectile (1), missile or the like by means of polarized electromagnetic radiation. The apparatus comprises a transmitter (2) for emitting polarized radiation in a direction towards the projectile and a polarization-sensitive receiver (3) disposed in the projectile or vice versa. The polarized radiation comprises at least two mutually phase-interlocked radiation components of the wavelength relationship of 2:1 and/or multiples thereof.
Inventors
- 👤 Lars-Erik Skagerlund
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-09 15:40
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
79 words
An apparatus for determining the roll position of a spinning projectile, missile or the like with the aid of polarized electro-magnetic radiation, comprising a transmitter operative to emit a polarized radiation in a direction towards the projectile and a polarization-sensitive receiver disposed in the projectile, or vice versa, characterized in that the polarized radiation comprises at least two mutually phase-interlocked radiation components of the wavelength relationship of 2:1 and/or multiples thereof which are superimposed to provide an asymmetric wave-form.
Claim 2
Independent Claim
79 words
An apparatus for determining the roll position of a spinning projectile, missile or the like with the aid of polarized electro-magnetic radiation, comprising a transmitter operative to emit a polarized radiation in a direction towards the projectile and a polarization-sensitive receiver disposed in the projectile, or vice versa, characterized in that the polarized radiation comprises at least two mutually phase-interlocked radiation components of the wavelength relationship of 2:1 and/or multiples thereof which are superimposed to provide an asymmetric wave-form.
Claim 3
Dependent Claim
18 words
The apparatus as claimed in Claim 1, characterized in that the emitted radiation lies within the microwave region.
Claim 4
Dependent Claim
52 words
The apparatus as claimed in Claim 1, characterized in that the received, composite signal is supplied each to its threshold circuit (5, 6) with positive and negative threshold levels, respectively, two signals (5b, 6b) of different pulse frequency being emitted, and from which the polarity of the received signal may be determined.
Claim 5
Dependent Claim
54 words
The apparatus as claimed in Claim 1, characterized in that the received radiation components are each supplied to their threshold circuit (5′, 6′) of zero or close to zero threshold level, two pulse signals being emitted whose outputs are coupled to a D flip-flop (7) operative to emit an output signal of varying polarity.
Claim 6
Dependent Claim
65 words
The apparatus as claimed in Claim 4, characterized in that said output signal is supplied to a phase comparator (8) in which the signal is compared with the signal from a counter (11), the output of the phase comparator being connected, by the intermediary of a low pass filter (9), to a voltage-controlled oscillator (10) which in its turn is connected to said counter (11).
Claim 7
Dependent Claim
48 words
The apparatus as claimed in Claim 2, characterized in that the received microwave signal is operative to be mixed with two phase-locked frequencies of the relationship 2:1 and/or multiples thereof from, for example, a harmonic frequency-rich local oscillator with the intention of obtaining a signal of lower frequency.
Claim 8
Dependent Claim
60 words
The apparatus as claimed in Claim 6, characterized in that the composite received microwave signal is supplied to a mixer (15) in which the signal is mixed with the signal from a harmonic frequency-rich oscillator (16), an asymmetric curve form of low intermediate frequency being obtained, after filtering, from which the roll position of the projectile may unambiguously be determined.
References Cited (Backward Citations)
No citation records indexed.
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