摘要:
An arrangement and method for digital frequency synthesis. The arrangement includes a device for phase quantization structured and arranged to operate based on a reference clock and a phase increment value, and a device for amplitude quantization structured and arranged to operate based on a reference clock and a phase increment value. The arrangement also includes a device for noise shaping of a phase arranged in the signal path after the device for phase quantization, a device for noise shaping of an amplitude arranged in a signal path after the device for amplitude quantization, and a phase to amplitude converter.
摘要:
In a method and apparatus for simultaneous detection and analysis of at least two electromagnetic signals, at least one of which is a radiation image signal, using a common detector, the input radiation image is divided into at least two partial images. The partial images are projected onto a radiation detector, such that the radiation intensities of the partial images are projected from the image center of the input radiation image to the edge of the radiation image on the detector.
摘要:
Extendible exhaust nozzle bell for rocket engine of aircraft or spacecraft includes a first part with smaller diameter fixedly arranged on motor of engine and a second part with larger diameter arranged in flexible manner with respect to first part. In a front stowed position, second part is located surrounding first part closer to the rocket motor and, in a rear operating position, first part is arranged further away from the rocket motor. A closed volume that can be acted on by a gaseous fluid causes an extension of the second part of the exhaust nozzle bell from the stowed position into the operating position. The closed volume is formed at least in part by a deformable rolling bellows arrangement coupled between the flexibly arranged second part of the exhaust nozzle bell and a fixed part of the rocket engine or of the aircraft or spacecraft.
摘要:
A system is described for the optical detection of a distant object, having a light beam generating device for generating a parallel light beam, a scanning unit for generating a scan pattern by deflecting the parallel light beam over a defined angular range, and a detector unit for detecting light reflected by the distant object. The scanning unit includes a rotating polygonal mirror with several reflecting partial mirror surfaces. The light beam generating device is provided for generating a parallel light beam in two different beam positions which, in response to a rotating position indicating signal indicating the rotating position of the polygonal mirror, can be switched over from a partial mirror surface to an adjacent partial mirror surface. Accordingly, a system is provided for the optical direction of a distant object, which system has a high capacity. In particular, the system permits the optical detection of distant objects, such as poorly recognizable obstacles, in the air space in the flight direction in front of an aircraft.
摘要:
A system for determining estimated navigation signal error information. Several error models are used by the evaluation unit, and, as a function of at least one defined selection standard, one of the several error models is selected. In determining the estimated navigation signal error information, the selected error model is applied to the received navigation signals, and the determined error information is transmitted to the radio navigation system and/or to user terminals.
摘要:
Described is an arrangement for digital frequency synthesis with a device for phase quantization and a device for amplitude quantization, based on a reference clock and a phase increment value, wherein the device for phase quantization is followed in the signal path by a device for noise shaping of the phase. In addition, a device for noise shaping of the amplitude is provided, which follows the device for amplitude quantization in the signal path. The instant abstract is neither intended to define the invention disclosed in this specification nor intended to limit the scope of the invention in any way.
摘要:
Method for the transmission of navigation data to user terminals of a satellite navigation system composed of navigation satellites and pseudolites. The method includes transmitting positional information for at least one of the pseudolites, as part of the navigation data, without the use of separate channels or protocols for the transmission of the positional information for the at least one pseudolite. The positional information is transmitted in the form of a model of a pseudolite trajectory in a reference coordinate system which the model accounts for orbit-divergent motions of the at least one pseudolite, and the positional information for the at least on pseudolite forms a part of the navigation data.
摘要:
A method for determining overbounds comprises the steps of determining conservative overbounds (qi) of at least one error (εi) in a first phase space, multiplying the conservative overbounds (qi) of errors (εi) in the first phase space by a first parameter (θ(−x)·2) and a second parameter (θ(x)·2), and determining an upper bound for the integrity risk at the alert limit (pw,int(AL)) in a second phase space using overbounds (qi) of errors (εi) in the first phase space by the first parameter (θ(−x)·2) and the second parameter (θ(x)·2).
摘要:
The invention describes a method for operating a data processing device while using compressed data, wherein a non-compressed boot program is loaded into a volatile working memory, which initiates a copying process of a compressed application program from a data memory into a volatile working memory with simultaneous decompression of the application program.
摘要:
In a method for relative time and position determinations for moving objects of a constellation, signals by the objects are isochronously transmitted, with each object transmitting a unique signal for that object. The received signals of each object of the constellation are transmitted to all other objects of the constellation after a predetermined waiting time.