US4027105A
Expired / Lapsed
US
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Control system to re-establish the orthogonality of two cross-coupled orthogonally polarized transmitted signals
Assignee: Licentia Patent Verwaltungs GmbH
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Filing: 1976-02-20
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Granted: 1977-05-31
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Expires: 1996-02-20
Abstract
Abstract A system for re-establishing the orthogonality of two orthogonally polarized transmitted signals which are each provided with a beacon signal of a different frequency and which are cross-coupled when received. The received signals are fed to a decoupling network, including two controllable members for adjusting the orthogonality of the received signals, which separates the two received signals. The beacon signal components of each of the two received signals are coupled out, and converted to two pairs of beacon signal components with one pair of components including a first component representative of the beacon signal of one beacon signal frequency in a first of the received signals and a second component representative of the other beacon signal frequency in the first received signal (which second beacon signal component constitutes the cross-coupling of the polarization in the first received signal), and with the other pair of components including a third component representative of the beacon signal of the first beacon signal frequency in the other received signal and a fourth component representative of the second beacon signal frequency in the other received signal. The first and fourth beacon signal components are each shifted in phase by 90° and the phase shifted first third beacon signal component in a first phase-sensitive demodulator, while the phase shifted fourth beacon signal component is multiplicatively compared with the second beacon signal component in a second phase-sensitive demodulator. The signals from the demodulators are used to adjust the controllable members of the decoupling network to restore the orthogonality of the two received signals.
Inventors
- 👤 Heinz Kannowade
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 23:52
CPC Classifications
H; H04; H04B; H04B7/00; H04B7/002
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
368 words
A control system for re-establishing the orthogonality of two transmitted orthogonally polarized signals which are cross-coupled when received in a relay link, one of said transmitted signals being provided with a beacon signal of a first frequency and the other of said transmitted signals being provided with a beacon signal of a second different frequency, said system comprising in combination: means for receiving said two transmitted signals; decoupling network means, having its input connected to the output of said receiving means and including at least first and second series connected controllable members for adjusting the orthogonality of said received signals, for providing a respective one of said two signals at each of its two outputs; means, connected to said outputs of said decoupling network means, for coupling out the beacon signal components from each of said output signals from said decoupling network means and for converting the coupled out beacon signal components into two pairs of beacon signal components with one of said pairs including a first beacon signal component representative of the beacon signal of said first frequency in a received one of said transmitted signals and a second beacon signal component representative of the beacon signal of said second frequency in said received one of said transmitted signals, and with the other of said pairs including a third beacon signal component representative of the beacon signal of said first frequency in the received other of said transmitted signals and a fourth beacon signal component representative of the beacon signal of said second frequency in said received other of said transmitted signals; phase shifting means for shifting the phase of each of said first and fourth beacon signal components by 90°; a first phase sensitive demodulator means for multiplicatively comparing said phase shifted first beacon signal component with said third beacon signal component to form a first (V2) control signal; a second phase sensitive demodulator means for multiplicatively comparing said second beacon signal component with said phase shifted fourth beacon signal component to form a second (V4) control signal; and means responsive to the value of said first and said second control signals for adjusting said controllable members to restore the orthogonality of the two received signals.
Claim 2
Dependent Claim
368 words
A control system for re-establishing the orthogonality of two transmitted orthogonally polarized signals which are cross-coupled when received in a relay link, one of said transmitted signals being provided with a beacon signal of a first frequency and the other of said transmitted signals being provided with a beacon signal of a second different frequency, said system comprising in combination: means for receiving said two transmitted signals; decoupling network means, having its input connected to the output of said receiving means and including at least first and second series connected controllable members for adjusting the orthogonality of said received signals, for providing a respective one of said two signals at each of its two outputs; means, connected to said outputs of said decoupling network means, for coupling out the beacon signal components from each of said output signals from said decoupling network means and for converting the coupled out beacon signal components into two pairs of beacon signal components with one of said pairs including a first beacon signal component representative of the beacon signal of said first frequency in a received one of said transmitted signals and a second beacon signal component representative of the beacon signal of said second frequency in said received one of said transmitted signals, and with the other of said pairs including a third beacon signal component representative of the beacon signal of said first frequency in the received other of said transmitted signals and a fourth beacon signal component representative of the beacon signal of said second frequency in said received other of said transmitted signals; phase shifting means for shifting the phase of each of said first and fourth beacon signal components by 90°; a first phase sensitive demodulator means for multiplicatively comparing said phase shifted first beacon signal component with said third beacon signal component to form a first (V2) control signal; a second phase sensitive demodulator means for multiplicatively comparing said second beacon signal component with said phase shifted fourth beacon signal component to form a second (V4) control signal; and means responsive to the value of said first and said second control signals for adjusting said controllable members to restore the orthogonality of the two received signals.
Claim 3
Dependent Claim
75 words
A control system as defined in claim 1 wherein: said first controllable member is a doubly polarizable waveguide section which is rotatable about its longitudinal axis with respect to the waveguide section of said receiving means; said second controllable member is a differential phase shifter disposed in a doubly polarizable waveguide section; and said means for adjusting is responsive to said first and second control signals for adjusting said first and second controllable members respectively.
Claim 4
Dependent Claim
98 words
The control system as defined in claim 1 wherein: said decoupling network means further includes third and fourth series connected controllable members; and further comprising: a third phase sensitive demodulator means for multiplicatively comparing said first and said third beacon signal components to form a third (V1) control signal; and a fourth phase sensitive demodulator means for multiplicatively comparing said second and said fourth beacon signal components to form a fourth (V3) control signal; and wherein said means for adjusting is responsive to said first, second, third and fourth control signals to adjust all of said controllable members.
Claim 5
Dependent Claim
125 words
A control system as defined in claim 3 wherein: said first controllable member is a doubly polarizable waveguide section which is rotatable about its longitudinal axis with respect to the waveguide section of said receiving means, said second settable member is a differential phase shifter disposed in a doubly polarizable waveguide section; said third controllable member is a doubly polarizable waveguide section which is rotatable about its longitudinal axis with respect to said second controllable member; said fourth controllble member is a differential attenuator disposed within a doubly polarizable waveguide section; and said means for adjusting is responsive to the values of said first, second, third and fourth control signals for adjusting said first, (V2) second (V4), third (V1) and fourth (V3) controllable members respectively.
Claim 6
Dependent Claim
122 words
A control system as defined in claim 3 wherein: said first controllable member is a doubly polarizable waveguide section which is rotatable about its longitudinal axis with respect to the waveguide section of said receiving means; said second controllable member is a differential phase shifter disposed in a doubly polarizable waveguide section; said third controllable member is a doubly polarizable waveguide section which is rotatable about its longitudinal axis with respect to said second controllable member; said fourth controllable member is a differential attenuator disposed within a doubly polarizable waveguide section; and said means for adjusting is responsive to said first, second, third and fourth control signals for adjusting said second (V4), first (V2), fourth (V3) and third (V1) controllable members respectively.
Claim 7
Dependent Claim
142 words
A control system as defined in claim 1 wherein said means for coupling out and converting includes: first and second filter means, each coupled to a respective output of said decoupling network means, for passing the beacon signal frequencies and rejecting the other frequencies of the two received signals; first and second mixer means, connected to the outputs of said first and second filter means, respectively, for mixing the respective output signals from said filter means with a mixing frequency to convert said respective output signals to signals in an intermediate frequency range; first and second amplifiers connected to the outputs of said first and second mixer means respectively; and first and second 3 dB couplers, each having its input connected to the output of a respective one of said first and second amplifiers and each providing a pair of output signals.
Claim 8
Dependent Claim
36 words
A control system as defined in claim 6 wherein: said means for converting further includes: first, second, third and fourth bandpass filters each connected to a respective one of the outputs of said 3 dB couplers.
Claim 9
Dependent Claim
102 words
A control system as defined in claim 7 wherein one of the two bandpass filters connected to each coupler passes the intermediate frequency associated with said first beacon signal frequency and does not pass the intermediate frequency associated with the second beacon signal frequency, and the other of said two bandpass filters connected to each coupler passes the intermediate frequency associated with said second beacon signal frequency and does not pass the intermediate frequency associated with said first beacon signal frequency, whereby said two pairs of beacon signal components appear at the outputs of said first, second, third, and fourth bandpass filters.
Claim 10
Dependent Claim
135 words
A control system as defined in claim 1 wherein said means for adjusting includes a plurality of control circuits, one for each of said controllable members and each being responsive to the value of a separate one of said control signals, each of said control circuits including: a servo motor whose output is connected to and controls the position of the associated said controllable member; an amplifier having its output connected to said motor for controlling same and having its input connected to the output of the associated said phase sensitive demodulator means; and a negative feedback loop including a generator which is mechanically coupled to said servo motor for producing an output voltage whose value depends on the angular velocity of said servo motor, the output of said generator being connected to said amplifier.
Claim 11
Dependent Claim
93 words
A control system as defined in claim 1 wherein said means for adjusting comprises a plurality of electronic control circuits, one for each of said controllable members and each being responsive to the value of a separate one of said control signals, each of said control circuits including an integrator having its output connected to the associated one of said controllable members for controlling same, and an amplifier having its output connected to the input of said integrator and having its input connected to the output of the associated said phase-sensitive demodulator means.
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) | 1980-05-30 | 1980-11-29 | 1981-05-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-05-30 | 1984-11-29 | 1985-05-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-05-30 | 1988-11-29 | 1989-05-31 | $7700.00 | Window Closed / Lapsed |