Raytheon

About: Raytheon is a company organization based out in Waltham, Massachusetts, United States. It is known for research contribution in the topics: Signal & Antenna (radio). The organization has 15290 authors who have published 18973 publications receiving 300052 citations.

Cable continuity testor including a sequential state machine

Abstract: Apparatus for testing a multiconductor cable is disclosed. The disclosed cable testor comprises a counter, the output of which is applied as a test signal to a portion of the conductors in the cable under test. A test signal for the remaining portion of the conductors in the cable under test is derived by inverting the output of the counter. Cable faults are detected by comparing the signals out of the cable to the applied test signals. The apparatus is controlled by a state machine which causes test signals to be successively generated until a cable fault is detected or a full set of test signals has been generated.

Robotic mobile low-profile transport vehicle

Abstract: A robotic mobile low-profile transport vehicle is disclosed. The vehicle can comprise a first transport module having a frame assembly, a mobility system, and a propulsion system and a second transport module having a frame assembly and a mobility system. A multi-degree of freedom coupling assemblage can join the first and second transport modules together. The vehicle can include a first platform supported about the frame assembly of the first transport module, and a second platform supported about the frame assembly of the second transport module. Each of the platforms can be configured to receive a load for transport. Additionally, the vehicle can include a control system that can operate to facilitate intra-module communication and coordination to provide a coordinated operating mode of the first and second transport modules and the coupling assemblage about a given terrain.

Sensitivity of iterative spectrally smooth temperature/emissivity separation to algorithmic assumptions and measurement noise

Abstract: Iterative spectrally smooth temperature-emissivity separation (ISSTES) is an algorithm proposed by C. Borel (1997, 1998) for retrieving surface temperature and emissivity from remotely sensed hyperspectral thermal infrared radiance. In this paper, uncertainty in retrieved temperature and emissivity will be formulated for two error sources: algorithmic error caused by departure of real materials from the smoothness assumption upon which the algorithm is predicated and measurement noise (uncorrelated Gaussian measurement errors). These uncertainties were then evaluated for the SEBASS LWIR instrument, for altitudes from ground level to 10 km, through stressing atmospheric conditions. Resulting algorithmic error was small for all but one material in the Spectral Library of Johns Hopkins University, Baltimore, MD. For all other materials, algorithmic error was found to increase with altitude up to about 2 km and then level off. The same behavior was found for the retrieval error due to noise.

Shipboard point defense system and elements therefor

Abstract: A combined defense and navigational system on a naval vessel is disclosed. The disclosed system includes a track-while-scan pulse radar which is controlled to provide either navigational information or tracking information on selected targets. Additionally, the disclosed system includes a plurality of guided missiles, each of which may be vertically launched and directed toward intercept of a selected target either by commands from the track-while-scan radar or from an active guidance system in each such missile.

Transform coding of stereo image residuals

Abstract: Stereo image compression is of growing interest because of new display technologies and the needs of telepresence systems. Compared to monoscopic image compression, stereo image compression has received much less attention. A variety of algorithms have appeared in the literature that make use of the cross-view redundancy in the stereo pair. Many of these use the framework of disparity-compensated residual coding, but concentrate on the disparity compensation process rather than the post compensation coding process. This paper studies specialized coding methods for the residual image produced by disparity compensation. The algorithms make use of theoretically expected and experimentally observed characteristics of the disparity-compensated stereo residual to select transforms and quantization methods. Performance is evaluated on mean squared error (MSE) and a stereo-unique metric based on image registration. Exploiting the directional characteristics in a discrete cosine transform (DCT) framework provides its best performance below 0.75 b/pixel for 8-b gray-scale imagery and below 2 b/pixel for 24-b color imagery, In the wavelet algorithm, roughly a 50% reduction in bit rate is possible by encoding only the vertical channel, where much of the stereo information is contained. The proposed algorithms do not incur substantial computational burden beyond that needed for any disparity-compensated residual algorithm.