Abstract: A power distribution system is disclosed for conducting electrical power through a combination of hollow tube conductors and flexible cabling. Each hollow tube conductor includes an end formed into flat pads. The flexible cabling comprises litz wire, and includes ends crimped to integral lugs. An end of the flexible cabling is coupled to an end of the hollow tube conductor. The other end of the flexible cabling is coupled to an electric device. The other end of the hollow tube conductor is coupled to another flexible cable, which is in turn coupled to another electric device. By connecting the hollow tube conductors, flexible cabling, and electrical devices in this way, an electrically conductive pathway may be established between the electrical devices. The power distribution system conducts alternating current (AC) power, and addresses the skin effect phenomenon that occurs when conducting AC power.

Abstract: In one example, the present disclosure describes an antenna system with at least two linear antenna arrays, each having a plurality of antenna elements. Each array is designed to transmit and receive signals from different respective spectrum bands. The first antenna array and second antenna array are arranged to form one longer, combined linear array of antenna elements. In addition, at least one antenna element is shared between the first and second antenna arrays. In one example, the first antenna array is connected to a first RF distribution and phase-shifting network to distribute RF power and impart a phase profile across the first antenna array and the second antenna array is connected to a second RF distribution and phase-shifting network to distribute RF power and impart a phase profile across the second antenna array.

Abstract: A method and a device for an aircraft for detecting noise in a signal of LOC type. A first step includes estimating a first lateral speed of the aircraft according to a first set of parameters. Concurrently, at least one second lateral speed of the aircraft is estimated according to at least one second set of parameters, among which at least one parameter is of different nature from each parameter of the first set of parameters. A second step includes comparing the first lateral speed and the at least one second lateral speed according to a threshold. If the difference between the first lateral speed and the at least one second lateral speed is greater than the threshold, the presence of noise in the signal of LOC type is detected.

Abstract: A distribution device for a glide guidance component, the distribution device including an array of antenna elements installed on a pylon. The distribution device includes: a first and a second input for receiving a CSB (carrier plus sideband) input signal and an SBO (sideband only) input signal respectively, a plurality of outputs connectable to the array and including a first and a second output for the first and second output signals, respectively; each of said output signals including a CSB component and an SBO component. The array of antenna elements is such as to irradiate an image-less type pattern and the distribution device is such that the outputs have an substantially equal amplitude value for each pair arranged symmetrically around a central point of the array and a phase difference which is identical for the two CSB and SBO components.

Abstract: Prior adaptive antenna systems can reduce effects of a jamming or interfering signal by reducing antenna gain in the direction of such signal. However, direction finding capability to enable location of the source of such signal in order to permit corrective or other action has not been available on an economical, low computational basis. Described systems and methods provide correlation matrix estimation to enable direction finding. In an embodiment, a beamformer unit derives an adaptive output signal with use of odd symmetry sequence perturbation signals and weighting signals developed with use of odd symmetry sequence perturbation signals. An extractor unit utilizes even symmetry sequence perturbation signals to process a form of the adaptive output signal, in derivation of output signals representative of a correlation matrix usable for direction finding.

Abstract: A method and apparatus for estimating a communication channel in a wireless communication system having multiple transmitter antennas using reduced rank estimation. The method exploits redundant and/or a priori knowledge within a system to simplify the estimation calculations. In one embodiment, a covariance matrix is calculated and analyzed to determine if the channel parameters may be reduced for channel estimation. If not, all parameters are used, otherwise a reduced rank matrix is used for the calculation.

Abstract: A beacon transmission signal comprises at least one carrier (C+SB) including sidebands (SB) and one sideband only signal (SBO), said carrier and said signal being in any mutual phase relationship. The method of the invention includes the steps of demodulating the sum of the carrier (C+SB) and of the signal (SBO), on one hand by multiplying it by a frequency (F), and on the other hand by multiplying it by the same frequency in phase quadrature, extracting from the products continuous components representative of the carrier portion (C) of said carrier (C+SB) and the low frequency components of the beacon transmission signal representative of the sideband portions (SB) of the carrier (C+SB) and of the signal (SBO), calculating the module and phase of portion (C) of the carrier (C+SB) and deriving from the low frequency components the amplitudes of the sidebands (SB) and the amplitude and phase of the signal (SBO).

Abstract: A glide path transmitter for an instrument landing system. The transmitter includes several antenna radiators by way of which high frequency signals containing various low frequency modulated carrier and side band components are radiated. The components overlap each other in the far field where they form a guide signal which can be evaluated by aircraft. Phases of the carrier oscillations of the radiated high frequency signals form the guide signal having a set relationship with each other. A separate digitally controlled modulator is provided for each high frequency signal fed to an antenna radiator. The modulator modulates the phase and amplitude of a high frequency oscillation fed thereto according to a given model and inputs the modulated high frequency signal into the antenna radiator allocated thereto, thus reducing the supply network expenditure.

Abstract: A surface guidance system for guiding aircraft equipped with Instrument Landing Systems along taxiways which utilizes two inductive loops (14,16) installed around the right half and the left half of the taxiways. Audio amplifiers (18,20) drive one loop (14) with an 90 Hz signal and the other loop (16) at 150 Hz. A sensor (22) mounted on the aircraft detects the composite magnetic field induced by the surface loops (14,16). The detected signal is conditioned and supplied to the ILS system to provide left/right lateral guidance to the pilot. Longitudinal aircraft position is determined by using dipole marker antennas (52) embedded near the taxiway center line. Each marker antenna (52) has a unique code identifier. Existing ILS equipped aircraft can sense the marker signal and transmit the aircraft position to the ATC facility. Additional pairs of loops (14,16) and marker antennas (52) are used for different taxiway or runway sections.

Abstract: A guidance system for landing an aircraft is described which uses a source of signals identifiable with the aircraft and a ground station which is linked to the aircraft. Specifically, the ground station includes a receiver which is connected to one or more pairs of antennas having a fixed, overlapping, directional sensitive pattern symmetically located relative to the center of the landing path, a receiver and a processor for measuring the relative sensitivity of the signals received at the antennas and for using the relative signal intensity to determine the location of the aircraft relative to the center of the landing path.

Abstract: An azimuthal scanning antenna for an aircraft landing system is formed of a set of vertically disposed columnar radiators arranged side-by-side in a horizontal array. The columnar radiators are tilted back in pitch 7.5.degree.. Individual ones of the radiators are formed of waveguide sections terminated by reflecting end walls. The terminating walls provide for a standing wave of electromagnetic field in response to microwave electromagnetic energy applied to the waveguide section by a feed disposed at or near the bottom of the waveguide section. Slot apertures are disposed along a front wall of each waveguide section, and are oriented at a selected angle relative to a perpendicular relationship to the sidewalls. The orientation of the slots introduces a variation in coupling for illumination of the radiation aperture of the radiator wherein the phase center is offset from a central point towards an upper end of each of the waveguide sections.

Abstract: A microwave landing system incorporates a set of antennas for the sequential transmission of guidance signals through a sequence of directions to enable the reception and decoding of the signals by an airborne receiver. Circuitry is included for the retransmission of a frame of the signals by a procedure wherein the directions of transmissions is altered so as to increase the guidance sector over which the receiver is effective.

Abstract: A process and means for increasing the range and the protection against jamming of a MLS system. It consists of transmitting a supplementary or reinforced preamble for each MLS function or group of MLS functions, via a scanning antenna used for the azimuth function, during the time when the latter is not normally used. This supplementary preamble consists of a certain number, e.g. four preferably accelerated scans, the variation between these scans being characteristic of the following function or functions.