Heterodyne Systems and Technology
Author | : |
Publisher | : |
Total Pages | : 634 |
Release | : 1977 |
Genre | : Aeronautics |
ISBN | : |
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Author | : |
Publisher | : |
Total Pages | : 634 |
Release | : 1977 |
Genre | : Aeronautics |
ISBN | : |
Author | : |
Publisher | : |
Total Pages | : 284 |
Release | : 1980 |
Genre | : |
ISBN | : |
Author | : NASA, Scientific and Information Branch |
Publisher | : |
Total Pages | : 262 |
Release | : 1980 |
Genre | : |
ISBN | : |
Author | : |
Publisher | : |
Total Pages | : 327 |
Release | : 1980 |
Genre | : |
ISBN | : |
Author | : United States. National Aeronautics and Space Administration |
Publisher | : |
Total Pages | : |
Release | : 1980 |
Genre | : |
ISBN | : |
Author | : |
Publisher | : |
Total Pages | : 319 |
Release | : 1980 |
Genre | : Heterodyning (Electronics) |
ISBN | : |
Author | : Rodney L. Spence |
Publisher | : |
Total Pages | : 68 |
Release | : 1993 |
Genre | : Laser communication systems |
ISBN | : |
The important principles of direct- and heterodyne-detection optical free-space communications are reviewed. Signal-to-noise-ratio (SNR) and bit-error-rate (BER) expressions are derived for both the direct-detection and heterodyne-detection optical receivers. For the heterodyne system, performance degradation resulting from received-signal and local oscillator-beam misalignment and laser phase noise is analyzed. Determination of interfering background power from local and extended background sources is discussed. The BER performance of direct- and heterodyne-detection optical links in the presence of Rayleigh-distributed random pointing and tracking errors is described. Finally, several optical systems employing Nd:YAG, GaAs, and CO2 laser sources are evaluated and compared to assess their feasibility in providing high-data-rate (10- to 1000-Mbps) Mars-to-Earth communications.
Author | : |
Publisher | : |
Total Pages | : 1572 |
Release | : 1992 |
Genre | : Aeronautics |
ISBN | : |
Author | : National Research Council |
Publisher | : National Academies Press |
Total Pages | : 321 |
Release | : 2014-03-14 |
Genre | : Technology & Engineering |
ISBN | : 0309302196 |
In today's world, the range of technologies with the potential to threaten the security of U.S. military forces is extremely broad. These include developments in explosive materials, sensors, control systems, robotics, satellite systems, and computing power, to name just a few. Such technologies have not only enhanced the capabilities of U.S. military forces, but also offer enhanced offensive capabilities to potential adversaries - either directly through the development of more sophisticated weapons, or more indirectly through opportunities for interrupting the function of defensive U.S. military systems. Passive and active electro-optical (EO) sensing technologies are prime examples. Laser Radar considers the potential of active EO technologies to create surprise; i.e., systems that use a source of visible or infrared light to interrogate a target in combination with sensitive detectors and processors to analyze the returned light. The addition of an interrogating light source to the system adds rich new phenomenologies that enable new capabilities to be explored. This report evaluates the fundamental, physical limits to active EO sensor technologies with potential military utility; identifies key technologies that may help overcome the impediments within a 5-10 year timeframe; considers the pros and cons of implementing each existing or emerging technology; and evaluates the potential uses of active EO sensing technologies, including 3D mapping and multi-discriminate laser radar technologies.
Author | : Chinlon Lin |
Publisher | : Springer Science & Business Media |
Total Pages | : 773 |
Release | : 2012-12-06 |
Genre | : Science |
ISBN | : 9401170355 |
Ever since the invention of the transistor, semiconductor-based microelec tronics has made a revolutionary impact on the information society, as evi dent from the widespread application of microprocessor-based technology in our modern society. The next wave of modern information technology, after transistors and microelectronics, is that oflasers and micro-optoelectronics. Optoelectronics, or optical electronics, based on lasers and related modern optical technology, has also become a very important field of science and technology in the past 20 years. Electronics or microelectronics deals with (micro)electronic devices and components for generation, transmission, and processing of electronic sig nals. In contrast, in optoelectronics we deal with optoelectronic devices and components for the generation, transmission, and processing of lightwave signals. It is the interaction of lightwaves (photons) with matter that shows the uniqueness of optoelectronic technology; optical absorption and scat tering, optical gain and amplification, material and waveguide dispersion, nonlinear optical effects, etc., are very much dependent on the material's intrinsic properties and the lightwave propagation effects.