GB1367922A – Adaptive power redistribution systems
– Google Patents
GB1367922A – Adaptive power redistribution systems
– Google Patents
Adaptive power redistribution systems
Info
Publication number
GB1367922A
GB1367922A
GB5454871A
GB5454871A
GB1367922A
GB 1367922 A
GB1367922 A
GB 1367922A
GB 5454871 A
GB5454871 A
GB 5454871A
GB 5454871 A
GB5454871 A
GB 5454871A
GB 1367922 A
GB1367922 A
GB 1367922A
Authority
GB
United Kingdom
Prior art keywords
output
path
psd
periods
phase
Prior art date
1971-02-24
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
GB5454871A
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.)
Raytheon Co
Original Assignee
Hughes Aircraft Co
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.)
1971-02-24
Filing date
1971-11-24
Publication date
1974-09-25
1971-11-24
Application filed by Hughes Aircraft Co
filed
Critical
Hughes Aircraft Co
1974-09-25
Publication of GB1367922A
publication
Critical
patent/GB1367922A/en
Status
Expired
legal-status
Critical
Current
Links
Espacenet
Global Dossier
Discuss
230000003044
adaptive effect
Effects
0.000
title
1
230000005540
biological transmission
Effects
0.000
abstract
6
238000010606
normalization
Methods
0.000
abstract
2
230000003321
amplification
Effects
0.000
abstract
1
230000005284
excitation
Effects
0.000
abstract
1
238000003199
nucleic acid amplification method
Methods
0.000
abstract
1
230000003287
optical effect
Effects
0.000
abstract
1
230000005855
radiation
Effects
0.000
abstract
1
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
G01S13/66—Radar-tracking systems; Analogous systems
G01S13/68—Radar-tracking systems; Analogous systems for angle tracking only
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
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
G01S17/00—Systems using the reflection or reradiation of electromagnetic waves other than radio waves, e.g. lidar systems
G01S17/02—Systems using the reflection of electromagnetic waves other than radio waves
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
G01S17/00—Systems using the reflection or reradiation of electromagnetic waves other than radio waves, e.g. lidar systems
G01S17/87—Combinations of systems using electromagnetic waves other than radio waves
H—ELECTRICITY
H01—ELECTRIC ELEMENTS
H01Q—ANTENNAS, i.e. RADIO AERIALS
H01Q3/00—Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system
H01Q3/26—Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system varying the relative phase or relative amplitude of energisation between two or more active radiating elements; varying the distribution of energy across a radiating aperture
H01Q3/2605—Array of radiating elements provided with a feedback control over the element weights, e.g. adaptive arrays
H01Q3/2647—Retrodirective arrays
Abstract
1367922 Lasers HUGHES AIRCRAFT CO 24 Nov 1971 [24 Feb 1971] 54548/71 Heading H1C [Also in Divisions H4 and G1] In a laser transmission system in which energy at optical frequencies is transmitted along a number of paths 14a-14i each path having a distinctive modulation applied thereto by modulators 22a-22c, the system power transmission efficiency is measured by receiving at 40 (e.g. via reflectors 16, 34, 36) a portion of each beam or path and utilizing modulation components in the received energy to provide a separate signal for each path indicative of the transmission efficiency of each path. Radiation for the three paths 14a-14c is derived from a laser 18. Each path contains a phase shifter 22a-22c (e.g. a movable mirror or an electro-optical device) driven at respective frequencies # 1-3 by oscillators 52a-52c, and a variable gain laser power amplifier 24a-24c, e.g. of the electronically pumped CO 2 type. The beams directed from apertures 26a-26c, which may include telescopes, are received at photodiode mixer 40 where they are heterodyned with the signal from a laser 42. After amplification the envelope of the amplified signal is applied to passband filters 48a-48c. Considering just channel 12a, its filter is centred at 2# 1 , # 1 being the phase modulation frequency of the transmitted beam 14a. It is shown in the Specification that if the phase of the beam is such that the beam intensity attains one of its cyclically occurring maxima at the target 16, Fig. 4 (not shown), then the amplitude-modulated component of the reflected beam at a frequency 2 # 1 is proportional to the transmission efficiency of the path. Accordingly the output from filter 48a and hence from PSD 50a is indicative of the transmission efficiency of the path 14a. The Specification also shows that the maximum power transmitting efficiency of the entire system is achieved when the gain of each amplifier 24a-24c is proportional to the transmission efficiency of the corresponding path. Accordingly the output from PSD 50a is supplied to a power control unit 28a which also receives, via normalization unit 72, the outputs from the PSD’s 50b, 50c of the other channels. In this way each control unit 28 adjusts the gain of its corresponding amplifier 24 to maintain the system efficiency at a maximum. A control unit 28 is shown in detail in Fig. 2. The computation unit 74 receives the output A m from the corresponding PSD 50 and also the output B from the normalization unit 72. The output W m from 74 feeds a sample and hold circuit 76. During “control” periods the output from 76 is fed via switch 78 to excitation control unit 80, which controls the gain of the associated power amplifier 24. During “calibration” periods unit 80 is responsive to the output from a reference source 82. The reference source signal is the same in all channels, so that all power amplifiers 24 have the same gain during “calibration” periods, which allows a meaning- ful comparison of their relative-contributions to the total received energy. The “calibration” and “control” periods alternate, and during “calibration” periods unit 74 computes the current value of W m which is stored at 76 until the next “control” period. The relative duration of these periods is governed by monostable multivibrator 86, which controls circuit 76 via differentiator 88, and by monostable multivibrator 84. Both multivibrators are controlled by clock pulses from a synchronization unit 70. In order to maintain the correct in-phase condition at the target each channel may be provided with a phase control feed-back loop, Fig. 5 (not shown). An additional filter (90a) centred at # 1 receives the output from the envelope detector 46. The filter output is supplied to a further PSD (92a) where it is phase detected against a signal at # 1 from oscillator 52a. The signal from the PSD (92a) is then summed with the reference signal # 1 in a transformer device (94a) whose output is applied to the phase shifter 22a. In this way it can be shown that the correct phase condition is maintained.
GB5454871A
1971-02-24
1971-11-24
Adaptive power redistribution systems
Expired
GB1367922A
(en)
Applications Claiming Priority (1)
Application Number
Priority Date
Filing Date
Title
US12862971A
1971-02-24
1971-02-24
Publications (1)
Publication Number
Publication Date
GB1367922A
true
GB1367922A
(en)
1974-09-25
Family
ID=22436243
Family Applications (1)
Application Number
Title
Priority Date
Filing Date
GB5454871A
Expired
GB1367922A
(en)
1971-02-24
1971-11-24
Adaptive power redistribution systems
Country Status (7)
Country
Link
US
(1)
US3727223A
(en)
JP
(1)
JPS5439569B2
(en)
DE
(1)
DE2157486C3
(en)
FR
(1)
FR2126172B1
(en)
GB
(1)
GB1367922A
(en)
IL
(1)
IL38104A
(en)
SE
(1)
SE379905B
(en)
Cited By (2)
* Cited by examiner, † Cited by third party
Publication number
Priority date
Publication date
Assignee
Title
GB2228846A
(en)
*
1989-03-01
1990-09-05
Stc Plc
Fibre optic transmission system
RU2532649C2
(en)
*
2012-12-29
2014-11-10
федеральное государственное автономное образовательное учреждение высшего образования “Санкт-Петербургский национальный исследовательский университет информационных технологий, механики и оптики”
Pancratic focusing system
Families Citing this family (16)
* Cited by examiner, † Cited by third party
Publication number
Priority date
Publication date
Assignee
Title
JPS50103642A
(en)
*
1974-01-23
1975-08-15
US4063819A
(en)
*
1976-08-27
1977-12-20
The United States Of America As Represented By The Secretary Of The Air Force
High energy laser pointing and tracking system utilizing beam angle/focus dither method of operation
JPS5922817B2
(en)
*
1977-02-24
1984-05-29
義夫 田代
Yarn bulking equipment
US4102572A
(en)
*
1977-08-11
1978-07-25
Hughes Aircraft Company
Dual-wavelength coherent optical adaptive systems
IT1117071B
(en)
*
1977-09-05
1986-02-10
Cselt Centro Studi Lab Telecom
DEVICE TO TRANSMIT MULTI-LEVEL SIGNALS ON OPTICAL FIBER
US4661786A
(en)
*
1984-04-16
1987-04-28
Mcdonnell Douglas Corporation
Method and apparatus for producing an optical phased array
US4794345A
(en)
*
1986-02-26
1988-12-27
Trw Inc.
Phased array combination of laser beams
US4831333A
(en)
*
1986-09-11
1989-05-16
Ltv Aerospace & Defense Co.
Laser beam steering apparatus
EP0287032B1
(en)
*
1987-04-13
1996-02-28
Nec Corporation
Optical alignment system
US5111208A
(en)
*
1989-02-23
1992-05-05
Hazeltine Corporation
Calibration of plural – channel system
US5017921A
(en)
*
1989-12-13
1991-05-21
Grumman Aerospace Corporation
Radar system and a method for operating a radar system
US5198607A
(en)
*
1992-02-18
1993-03-30
Trw Inc.
Laser anti-missle defense system
DE69432844T2
(en)
*
1993-04-29
2004-05-19
Ericsson Inc.
Time diversity transmission system to reduce adjacent channel interference in mobile phone systems
KR100608736B1
(en)
*
2003-04-29
2006-08-04
엘지전자 주식회사
Apparatus for generating reference signal in a smart antenna system
US8077081B2
(en)
*
2008-01-29
2011-12-13
Honeywell International Inc.
Ground collision instrument for aircraft and marine vehicles
JP5612257B2
(en)
*
2008-10-20
2014-10-22
株式会社Ｎｔｔドコモ
Multi-antenna measurement method and multi-antenna measurement system
Family Cites Families (6)
* Cited by examiner, † Cited by third party
Publication number
Priority date
Publication date
Assignee
Title
BE546699A
(en)
*
1955-04-04
US2896073A
(en)
*
1957-09-13
1959-07-21
Sinclair Oil & Gas Company
Apparatus to automatically control transmitter power
US3267380A
(en)
*
1962-10-19
1966-08-16
Sichak Associates
Diversity phase control system using subcarrier identifying signals
GB1155603A
(en)
*
1965-11-10
1969-06-18
Standard Telephones Cables Ltd
Automatic Phase Control for Radio Transmitters
US3453559A
(en)
*
1966-04-01
1969-07-01
Sperry Rand Corp
Multiple laser amplifier phase control system
US3424269A
(en)
*
1966-09-30
1969-01-28
Bell Telephone Labor Inc
Multipath focusing signal processor
1971
1971-11-09
IL
IL38104A
patent/IL38104A/en
unknown
1971-11-19
DE
DE2157486A
patent/DE2157486C3/en
not_active
Expired
1971-11-23
SE
SE7115001A
patent/SE379905B/xx
unknown
1971-11-24
GB
GB5454871A
patent/GB1367922A/en
not_active
Expired
1971-11-24
JP
JP9372871A
patent/JPS5439569B2/ja
not_active
Expired
1971-11-24
FR
FR7142054A
patent/FR2126172B1/fr
not_active
Expired
1972
1972-02-24
US
US00128629A
patent/US3727223A/en
not_active
Expired – Lifetime
Cited By (3)
* Cited by examiner, † Cited by third party
Publication number
Priority date
Publication date
Assignee
Title
GB2228846A
(en)
*
1989-03-01
1990-09-05
Stc Plc
Fibre optic transmission system
GB2228846B
(en)
*
1989-03-01
1993-08-18
Stc Plc
Fibre optic transmission system
RU2532649C2
(en)
*
2012-12-29
2014-11-10
федеральное государственное автономное образовательное учреждение высшего образования “Санкт-Петербургский национальный исследовательский университет информационных технологий, механики и оптики”
Pancratic focusing system
Also Published As
Publication number
Publication date
US3727223A
(en)
1973-04-10
DE2157486A1
(en)
1972-09-21
JPS5439569B2
(en)
1979-11-28
IL38104A0
(en)
1972-02-29
JPS4721637A
(en)
1972-10-04
IL38104A
(en)
1974-01-14
DE2157486B2
(en)
1979-02-01
SE379905B
(en)
1975-10-20
FR2126172A1
(en)
1972-10-06
DE2157486C3
(en)
1979-09-20
FR2126172B1
(en)
1975-02-21
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Legal Events
Date
Code
Title
Description
1975-02-05
PS
Patent sealed [section 19, patents act 1949]
1982-06-30
PCNP
Patent ceased through non-payment of renewal fee
