Matches 1 - 34 out of 34
Match Document Document Title
7630738 Radio communication system, mobile terminal unit thereof, and azimuth determining method  
Disclosed are a mobile station unit which can obtain azimuth information with a simple construction and a radio communication system including the mobile terminal unit. According to the present...
7489274 System and method for generating a very high frequency omnidirectional range signal  
A system and method for generating signals for testing a Very High Frequency Omnidirectional Range (VOR) receiver is described. The system includes a waveform generator and a signal generator. The...
6996420 Radio communication system, mobile terminal unit thereof, and azimuth determining method  
Disclosed are a mobile station unit which can obtain azimuth information with a simple construction and a radio communication system including the mobile terminal unit. According to the present...
5878330 Satellite communications system including automatic frequency control  
An automatic frequency control system for use in satellite communications is provided that is pre-programmed with an initial acquisition Doppler offset frequency. The system includes a search mode...
5635941 Method and apparatus for feeding over-modulated message signals to antennas of an antenna array  
A feeding method and device, particularly for a Doppler VOR system, and to a Doppler VOR system using such a feeding device. The feeding method performs a blending function, which is an...
4644358 Stem orientation measurement apparatus  
An apparatus to confirm an orientation of the stem of ship by making use of a satellite included in the Global Positioning System. Radio wave signals from the satellite are received by a...
4485384 Microwave system  
The new invention is a description of a double sideband commutated Doppler microwave system for landing aircraft or spacecraft. It is capable of providing angular information in elevation and...
4417250 Monitoring device for a radio navigation system of the doppler VOR type  
A device for monitoring a Doppler VOR system emitting sinusoidal signals at a frequency of 30 Hz, one called "reference" and the other called "variable" whose phase varies with respect to that of...
4160960 Power-dividing and modulating arrangement  
A power divider and modulator is disclosed comprising a HF signal source which supplies a carrier signal to a pair of 1/4λ transformers each terminated with a variable impedance, whose impedance...
4151529 Radio beacon for aerial navigation system  
An air-navigational beacon, designed to simulate an imaginary circular ben with a multiplicity of pairs of diametrically opposite dipoles excited in cyclic succession, comprises an array of...
4106023 Navigation aid system  
An apparatus or method, for characterizing carrier waves according to the direction in which the carrier waves are transmitted or received, comprises radiating or receiving from a position which is...
4104636 Doppler reference antenna with phased centerline emphasis  
In a doppler radionavigation system wherein a transmitted signal has opposite frequency coding during alternating time intervals, a reference antenna is provided which has different radiation modes...
4063242 Doppler navigation system with reference signal source diversity  
A Doppler Radio Navigation beacon with multi-element reference and main commutated arrays. The reference signal is programmed among the reference array elements irregularly to provide spatial...
4035804 Simulated Doppler navigational system with second order diversity  
A simulated Doppler navigation beacon system providing second order spatial diversity with respect to excitation of its commutated 2-dimensional main (coordinate) array and a linear reference...
4017860 Radio navigation beacon  
A Doppler Navigation Beacon incorporating the moving reference concept in a planar antenna matrix with programmed excitation, replacing the linear commutated array of the prior art to provide...
3953854 Doppler radio navigation beacon system with means for reducing multipath signal effects  
A Doppler Navigation ground beacon antenna commutating arrangement in which the primary scan program radio frequency and reference radio frequency signals are both applied to the antenna elements...
3914765 Simplified doppler antenna system  
Disclosed is a simplified antenna system for radiating a frequency coded pattern using a beam-port antenna. The antenna system radiates a pattern wherein the frequency of the radiated wave energy...
3885241 Doppler radio navigation beacon system adapted for angle determination using unmodified communication receiver  
A radio navigation beacon system including a commutated main beacon array and a reference array. The commutation of the main array produces a simulated Doppler signal at a remote receiving point....
3883875 Endfire commutated antenna array  
A commutated linear antenna array of general utility in simulated Doppler guidance systems. The array operates as an entire array of n elements in which n-1 elements are successively excited in...
3879734 Doppler radio navigation beacon antenna with wide and unequal element spacing  
A Doppler ground beacon system for use in navigation systems providing for air-derived angle data. The System includes a thinned array with wide but uneven element spacing and spacing proportional...
3873983 Radio navigation beacon  
A Doppler Navigation system which includes a surface based commutated array on a platform to provide air derived angle information, particularly for aircraft landing approach guidance. The program...
3866227 DOPPLER TRACKER RECEIVER  
A doppler tracker suitable for use as an airborne receiver in a doppler scan microwave landing system. The tracker derives a tracking error signal for a phase-locked VCO which employs a...
3864679 ANTENNA SYSTEM FOR RADIATING DOPPLER CODED PATTERN USING MULTIPLE BEAM ANTENNA  
Disclosed is an antenna system for radiating a frequency coded or "Doppler" pattern of wave energy into a region of space using a multiple-beam antenna unit. The system radiates a pattern in which...
3854137 DIRECTION DETERMINING METHOD  
A direction-determining system, particularly for measuring the elevation by determining the transit-time differences of electro-magnetic waves which are successively sent out by a reference...
3845486 DOPPLER MICROWAVE LANDING SYSTEMS  
In a ground station providing guidance to aeroplanes, microwave energy is transmitted from a reference aerial and a vertical array of radiating elements along which the signal is commutated. The...
3836978 COMMUTATED ANTENNA ARRAY WITH GRATING LOBE REDUCTION MEANS IN A DOPPLER RADIO NAVIGATION BEACON SYSTEM  
A commutated antenna array for a Doppler type radio navigation beacon system in which there are reference and main arrays. A limited number of additional elements are added to the main array on a...
3787861 IMPROVEMENTS IN DOPPLER INSTRUMENT LANDING SYSTEMS  
A transmitter for a Doppler ILS system comprises two antenna systems operating in a diplex arrangement; the first antenna system is conventional, and is formed by an array of antennas regularly...
3754261 RADIO NAVIGATION BEACON  
A method and apparatus for improved signal amplitude tapering in a Doppler Navigation system having a multi-element linear array which is R.F. excited element-by-element through a commutator to...
3743971 VOR AM MODULATOR  
Amplitude modulation techniques are applied to a 9960 Hz subcarrier signal of the type defined by VOR navigation systems by means separately applying a 30 Hz variable phase test signal and a 9960...
3728729 RADIO NAVIGATION BEACON INCLUDING ANTENNA ELEMENT COMMUTATION  
A radio navigation beacon system of the Doppler type having a simplified antenna arrangement. A main array employing 30 array elements spaced at four wavelengths and an auxiliary or reference array...
3670337 RADIO NAVIGATION BEACON UTILIZING A COMMUTATOR WHICH SUPPLIES RADIO FREQUENCY IN SUCCESSION TO SEVERAL AERIALS  
A radio navigation beacon is provided having a linear array of equally spaced aerials and means which commutate radio-frequency to each said aerial in succession so as to produce bi-directional...
3626419 DOPPLER NAVIGATION SYSTEM  
A first frequency signal is successively radiated from each antenna of a vertical array thereby simulating a constant velocity moving source; and second and third frequency signals are continuously...
3144646 Doppler system  
3094697 Frequency modulated approach beacon  
Matches 1 - 34 out of 34