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Direction-finders for determining the direction from which infrasonic, sonic, ultrasonic, or electromagnetic waves, or particle emission, not having a directional significance, are being received
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CPC
G01S3/00
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Parent Industries
G
PHYSICS
G01
Measuring instruments
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
Current Industry
G01S3/00
Direction-finders for determining the direction from which infrasonic, sonic, ultrasonic, or electromagnetic waves, or particle emission, not having a directional significance, are being received
Sub Industries
G01S3/02
using radio waves
G01S3/023
Monitoring or calibrating
G01S3/026
Simulating means therefor
G01S3/04
Details
G01S3/043
Receivers
G01S3/046
Displays or indicators
G01S3/06
Means for increasing effective directivity
G01S3/065
by using non-directional aerial
G01S3/08
Means for reducing polarisation errors
G01S3/085
by using spaced loop aerial systems
G01S3/10
Means for reducing or compensating for quadrantal, site, or like errors
G01S3/12
Means for determining sense of direction
G01S3/14
Systems for determining direction or deviation from predetermined direction
G01S3/143
by vectorial combination of signals derived from differently oriented antennae
G01S3/146
by comparing linear polarisation components
G01S3/16
using amplitude comparison of signals derived sequentially from receiving aerials or aerial systems having differently-oriented directivity characteristics or from an aerial system having periodically-varied orientation of directivity characteristic
G01S3/18
derived directly from separate directional aerials
G01S3/20
derived by sampling signal received by an aerial system having periodically-varied orientation of directivity characteristic
G01S3/22
derived from different combinations of signals from separate aerials
G01S3/24
the separate aerials comprising one directional aerial and one non-directional aerial
G01S3/26
the separate aerials having differently-oriented directivity characteristics
G01S3/28
using amplitude comparison of signals derived simultaneously from receiving aerials or aerial systems having differently-oriented directivity characteristics
G01S3/30
derived directly from separate directional systems
G01S3/32
derived from different combinations of signals from separate aerials
G01S3/325
Automatic tracking systems
G01S3/34
the separate aerials comprising one directional aerial and one non-directional aerial
G01S3/36
the separate aerials having differently-oriented directivity characteristics
G01S3/38
using adjustment of real or effective orientation of directivity characteristic of an aerial or aerial system to give a desired condition of signal derived from that aerial or aerial system
G01S3/40
adjusting orientation of a single directivity characteristic to produce maximum or minimum signal
G01S3/42
the desired condition being maintained automatically
G01S3/44
the adjustment being varied periodically or continuously until it is halted automatically when the desired condition is attained
G01S3/46
using aerials spaced apart and measuring frequency phase or time difference between signals therefrom
G01S3/465
the waves arriving at the aerials being frequency modulated and the frequency difference of signals therefrom being measured
G01S3/48
the waves arriving at the aerials being continuous or intermittent and the phase difference of signals derived therefrom being measured
G01S3/50
the waves arriving at the aerials being pulse modulated and the time difference of their arrival being measured
G01S3/52
using a receiving aerial moving, or appearing to move, in a cyclic path to produce a Doppler variation of frequency of the received signal
G01S3/54
the apparent movement of the aerial being produced by coupling the receiver cyclically and sequentially to each of several fixed spaced aerials
G01S3/56
Conical-scan beam systems using signals indicative of the deviation of the direction of reception from the scan axis
G01S3/58
Rotating or oscillating beam systems using continuous analysis of received signal for determining direction in the plane of rotation or oscillation or for determining deviation from a predetermined direction in such a plane
G01S3/60
Broad-beam systems producing in the receiver a substantially sinusoidal envelope signal of the carrier wave of the beam, the phase angle of which is dependent upon the angle between the direction of the transmitter from the receiver and a reference direction from the receiver
G01S3/62
wherein the phase angle of the signal is indicated by a cathode-ray tube
G01S3/64
wherein the phase angle of the signal is determined by phase comparison with a reference alternating signal varying in synchronism with the directivity variation
G01S3/66
Narrow-beam systems producing in the receiver a pulse-type envelope signal of the carrier wave of the beam, the timing of which is dependent upon the angle between the direction of the transmitter from the receiver and a reference direction from the receiver Overlapping broad-beam systems defining in the receiver a narrow zone and producing a pulse-type envelope signal of the carrier wave of th...
G01S3/68
wherein the timing of the pulse-type envelope signal is indicated by cathode-ray tube
G01S3/70
wherein the timing of the pulse-type envelope signal is determined by bringing a locally-generated pulse-type signal into coincidence or other predetermined time-relationship with the envelope signal
G01S3/72
Diversity systems specially adapted for direction-finding
G01S3/74
Multi-channel systems specially adapted for direction-finding
G01S3/78
using electromagnetic waves other than radio waves
G01S3/7803
Means for monitoring or calibrating
G01S3/7806
using gamma or X-rays
G01S3/781
Details
G01S3/782
Systems for determining direction or deviation from predetermined direction
G01S3/783
using amplitude comparison of signals derived from static detectors or detector systems
G01S3/7835
using coding masks
G01S3/784
using a mosaic of detectors
G01S3/785
using adjustment of orientation of directivity characteristics of a detector or detector system to give a desired condition of signal derived from that detector or detector system
G01S3/786
the desired condition being maintained automatically
G01S3/7861
Solar tracking systems
G01S3/7862
mounted on a moving platform
G01S3/7864
T.V. type tracking systems
G01S3/7865
using correlation of the live video image with a stored image
G01S3/7867
Star trackers
G01S3/7868
using horizon sensors
G01S3/787
using rotating reticles producing a direction-dependant modulation characteristic
G01S3/788
producing a frequency modulation characteristic
G01S3/789
using rotating or oscillating beam systems
G01S3/80
using ultrasonic, sonic or infrasonic waves
G01S3/8003
Diversity systems specially adapted for direction finding
G01S3/8006
Multi-channel systems specially adapted for direction-finding
G01S3/801
Details
G01S3/802
Systems for determining direction or deviation from predetermined direction
G01S3/8022
using the Doppler shift introduced by the relative motion between source and receiver
G01S3/8025
Conical-scan beam systems using signals indicative of the deviation of the direction of reception from the scan axis
G01S3/8027
By vectorial composition of signals received by plural, differently-oriented transducers
G01S3/803
using amplitude comparison of signals derived from receiving transducers or transducer systems having differently-oriented directivity characteristics
G01S3/8032
wherein the signals are derived sequentially
G01S3/8034
wherein the signals are derived simultaneously
G01S3/8036
derived directly from separate directional systems
G01S3/8038
derived from different combinations of signals from separate transducers comparing sum with difference
G01S3/805
using adjustment of real or effective orientation of directivity characteristic of a transducer or transducer system to give a desired condition of signal derived from that transducer or transducer system
G01S3/8055
adjusting orientation of a single directivity characteristic to produce maximum or minimum signal
G01S3/807
the desired condition being maintained automatically
G01S3/808
using transducers spaced apart and measuring phase or time difference between signals therefrom
G01S3/8083
determining direction of source
G01S3/8086
determining other position line of source
G01S3/809
Rotating or oscillating beam systems using continuous analysis of received signal for determining direction in the plane of rotation or oscillation or for determining deviation from a predetermined direction in such a plane
G01S3/82
with means for adjusting phase or compensating for time-lag errors
G01S3/84
with indication presented on cathode-ray tubes
G01S3/86
with means for eliminating undesired waves
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