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.

Radar system and method of operating same

Abstract: A method of operating a radar system, including the steps of digitally sampling a received signal at a predetermined sampling rate, to periodically provide a set of selected samples, the set of selected samples including positive going ramp samples, negative going ramp samples and CW burst samples and performing a first fast Fourier transform (FFT) on the positive going ramp samples, performing a second fast Fourier transform on the negative going ramp samples and performing a third fast Fourier transform on the CW burst samples is described. Utilizing the subsequent radar operations the method further includes the steps of tracking each resulting signal from the first fast Fourier transform performing steps, tracking each resulting signal from the second fast Fourier transform performing steps and tracking each resulting signal from the third fast Fourier transform performing steps and associating any resulting signals from the tracking steps to periodically provide output signals indicative of other vehicles.

Licensed driver detection for high occupancy toll lane qualification

Abstract: A method for collecting tolls on a high occupancy toll lane includes detecting a number of driver's licenses inserted into a card reader located in a vehicle and transmitting the number of driver's licenses to a roadside transceiver for a determination of a toll amount for the vehicle based on the number of driver's licenses A transponder for use with the method includes a card reader for reading information from one or more driver's licenses inserted into the card reader and a processor operative to generate a licensed driver count related to the number of driver's licenses inserted into the card reader In one embodiment, the processor is operative to determine whether or not a driver's license is valid and the licensed driver count is indicative of the number of valid driver's licenses inserted into the card reader

Carbon in the N159/N160 Complex of the Large Magellanic Cloud

Abstract: We present a study of carbon in N159/N160, an H II region complex in the low-metallicity Large Magellanic Cloud. We have mapped this region, which comprises four distinct molecular clouds spanning a wide range of star formation activity, in four transitions: 13CO (J = 1 → 0), 12CO (J = 2 → 1) and (J = 4 → 3), and [C I] (3P1→3P0). Combining these data with existing [C II] (2P3/2→2P1/2) observations provides a complete picture of the predominant forms of carbon in the gas phase of the ISM. The new CO (J = 2 → 1) data show that the complex is immersed in an envelope of extended, low-level emission, undetected by previous (J = 1 → 0) mapping efforts. The 12CO (J = 2 → 1)/(J = 1 → 0) ratio in this envelope is 3, a value consistent with optically thin CO emission. The envelope is also relatively bright in [C I] and [C II], and calculations show that it is mostly photodissociated: it appears to be translucent (AV < 1). Neutral carbon emission in the complex unexpectedly peaks at the quiescent southern cloud (N159S). In the northern portion of the map (the N160 nebula), the H II regions prominent in [C II] correspond to holes in the [C I] distribution. Overall we find that, while the I/ICO ratio is enhanced with respect to similar complexes in the Milky Way, the I/ICO ratio appears to be similar or reduced.

A Revised Characterization of the WFPC2 CTE Loss

Abstract: Charge transfer loss on the Wide Field Planetary Camera 2 (WFPC2) onboard the Hubble Space Telescope is a primary source of uncertainty in stellar photometry obtained with this camera. This effect, discovered shortly after the camera was installed, has grown over time and can dim stars by several tenths of a magnitude (or even more, in particularly bad cases). The impact of CTE loss on WFPC2 stellar photometry was characterized by several studies between 1998 and 2000, but has received diminished attention since ACS became HST's primary imager. After the failure of ACS in January 2007, WFPC2 once again became the primary imaging instrument on board HST, restoring the importance of ensuring accurate CTE corrections. This paper reexamines the CTE loss of WFPC2, with three significant changes over previous studies. First, the present study considers calibration data obtained through 2007, thus increasing the confidence in the reliability of the CTE corrections when applied to recent observations. Second, the change in CTE loss during readout is accounted for analytically. Finally, a reanalysis of the CTE dependencies on counts, background, and observation date was made. The resulting correction is significantly more accurate than that provided in the WFPC2 Instrument Handbook (Dolphin 2002 and updates through 2004), resulting in photometry that can be enhanced by over 5% in certain circumstances.

RF Applicator for in situ heating

Abstract: A coaxially fed applicator for in situ RF heating of subsurface bodies with a coaxial choke structure for reducing outer conductor RF currents adjacent the radiator. The outer conductor of the coaxial transmission line supplying RF energy to the radiator terminates in a coaxial structure comprising a section of coaxial line extending toward the RF radiator from the termination for a distance approaching a quarter wavelength at the RF frequency and a coaxial stub extending back along the coaxial line outer conductor from the termination for a distance less than a quarter wavelength at said frequency. The central conductor of the coaxial transmission line is connected to an enlarged coaxial structure approximately a quarter of a wavelength long in a region beyond the end of the outer conductor coaxial choking structure.