Abstract: A method for scheduling radar transmissions for a phased array antenna system having at least two antenna faces, in which each respective antenna face is configured to receive echoes of possible targets corresponding to previous radar transmissions by the respective antenna face. The method includes determining, based on a list of requested radar transmissions, a scheduling process including starting times of radar transmissions for each of the antenna faces for substantially each radar transmission included in the list of requested radar transmissions. Further, the scheduling process is arranged such that the antenna faces are used substantially simultaneously, transmission by an antenna face is prevented when another antenna face is about to receive echoes corresponding to possible targets, and radar transmissions for each antenna face end at substantially the same time. In addition, radar transmissions for the antenna faces are substantially mutually synchronized.

Abstract: An improved ship which incorporates a distortion sensor arrangement. Measurement data supplied by the distortion sensor arrangement is preferably used to correct measurement data supplied by and/or control signals for an on-board directional apparatus. The distortion sensor arrangement preferably includes a hull-mounted laser beam/light sensor combination, and such that the light sensor continuously measures a deflection of the laser beam in response to a distortion of the ship.

Abstract: Method for manufacturing a multilayer microwave board in one operation. Individually etched layers of a laminate, such as duroid, are bonded to form a package and drilled after which the resulting holes are plated. Next, the superfluous connections are removed by drilling during which process each stripline-coax transition buried in the package is tuned by a correct selection of the drill diameter and the hole depth.

Abstract: The invention relates to a receiver system for the reception of a series of ultrashort, pulsed electromagnetic signals. Signals of this type usually require an extremely fast-acting receiver, necessarily situated in close proximity to the antenna. According to the invention, the presence of several passive components near the antenna will suffice.

Abstract: A method of operating a fire-control system for simultaneously engaging a plurality of threats in which one plan from a pool of heuristically determined feasible plans is selected based on an environment of the fire-control system and a selected criterion to engage the plurality of threats. In addition, a genetic algorithm is applied to the pool of feasible plans prior to selecting the one plans to generate additional plan to replenish the pool, and a best feasible plan is selected from the pool with the criterion serving as the standard. Further, at least one randomly selected feasible plan is added to the pool of feasible plans before the genetic algorithm is applied to the pool of feasible plans.

Abstract: Array antenna of the monopulse type for realizing, on the basis of at least two groups of radiators, of at least two receiving beams for obtaining a difference signal. According to the invention, the at least two groups are homogeneously distributed within the antenna volume. In a transmit mode, the radiators are steered collectively, in a receive mode, the radiators are combined per group.

Abstract: A multiface phased array antenna, with each antenna face being provided with a plurality of T/R modules. To preclude the occurrence of crosstalk among the different antenna faces, caused by the steep edges of transmitted RF pulses, these pulses are delayed per T/R module with a delay selected from a predetermined time interval.

Abstract: The invention comprises an array of radiating elements (1) to be used as a module in a phased-array radar antenna, the radiating elements consisting of waveguides of rectangular section. The radiating elements are disposed on a common surface (2), which causes the common surface to constitute a side wall of each radiating element. The radiating elements preferably consist of channel sections (3). This consequently yields a rigid construction, while the array can be realised in only a limited number of manufacturing operations.

Abstract: A radar apparatus provided with a sidelobe blanking circuit. The apparatus includes a directive antenna with a main receiver, and an auxiliary antenna with an auxiliary receiver. The apparatus also has a differential antenna with a differential receiver. Comparators compare the outputs of the auxiliary receiver and the differential receiver. Blanking does not occur when the output of the main receiver is larger than both other output signals.

Abstract: The invention relates to a multi-face phased array antenna. To prevent crosstalk between the individual faces, each face comprises two cancellers, each of which cancels the crosstalk from an adjacent face. To this end, each canceller receives a reference signal from an adjacent face and is provided with a quadrature mixer and a vector modulator.

Abstract: The method of determining an impact point of a fired projectile relative to a target. The target is first tracked with the first beam. In the meantime, a second beam is directed above the target and waits for the projectile to be situated within the beam. The projectile's impact point is subsequently predicted by extrapolating the measuring data from the second beam.

Abstract: The invention relates to an arrangement for detecting approaching high-velocity targets using rotatable optical detectors (2, 3) of the line array type. With a view to the suppression of false alarms, the arrangement moreover comprises a hollow rotation axis (4) containing a mirror (14) that can be oriented such that a detector of the staring array type, a laser range-finder or a CW Doppler laser detector, all likewise contained in the hollow rotation axis, can be directed at a potential target.

Abstract: The invention relates to an arrangement for generating sound waves or anti-sound waves. For the sound waves. For the sound wave transducer, use can be made of window glass (1) or other types of transparent material, which is set into vibration by means of one or a plurality of actuators (6), such as piezo elements or actuators based on electrostatic attraction and repulsion.

Abstract: A phased array antenna including a number of waveguide radiators in a power supply system. A calibration network provides a test pulse. By directly connecting the calibration network to the waveguide radiators, a more accurate calibration is obtained due to the processing of any phase and amplitude errors arising in the waveguide radiators in a calibration algorithm. The calibration network can be designed as a system of waveguides.

Abstract: The invention relates to a method for realizing a radar transmission for a high-resolution radar. According to the method, a number of groups of pulses is transmitted with incremental frequencies, each group also comprising a number of pulses with incremental frequencies, which pulses are transmitted simultaneously or substantially simultaneously.

Abstract: A fire control system and a method for estimating periodic component of a target path. An efficient, fast-setting estimator is realized by first estimating the period and then the amplitude of the periodic component on the basis of the most recent measurements made.

Abstract: The invention relates to an antenna in stripline technology, in which the dipoles and the feeder network are etched in one single process. The connections of the dipoles are realized as two-wire transmission lines, fed by Schiffman couplers. The polarization of the antenna is selectably chosen by twisting the transmission lines.

Abstract: An arrangement for detecting targets with an infrared sensor. The number of false alarms can be reduced by comparing image matrices generated by a detector in one revolution on the basis of pre-alarms generated in the image matrices by point target extractors. Between the matrices generated in succession, differences are introduced by means of a different spectral response, polarization section and parallax.

Abstract: A low cost and rugged apparatus for assessing damage to a ship's hull. Parallel optical fibers run along the ship's hull. If damage occurs, the fibers are broken and the breaks are detected by a centrally located unit. The location and extent of damage can be accurately determined. The fibers can also be used to detect fires and to convey operator induced alarm signals.