Unclassified Ad 4 2 5 8 3 2 Defense Documentation
نویسندگان
چکیده
. Various problems associated with receivers for laser radars were investigated experimentally and theoretically. The spontaneous emissionpower of a laser amplifier was calculated theoretically pnd compared with the experimental results obtained fror^ a ruby laser amplifier. A high gain single pass xenon gas laser amplifier was constructed with a net gain of 48 dB/m at 3.5 |Ji, The 3.39 p. line of a single pass helium-neon gas amplifier was magnetically tuned and it was found that the gain-bandwidth product of the amplifier varied from 200 Mc to 400 Mc depending upon the polarization and strength of the input signal. A survey of laser detector technology was made. Feasibility studies were made of various coherent optical data processing concepts. Synthetic aperture techniques appear to be only marginally feasible, but there is no fundamental limitation that would prevent the application of pulse compression techniques to optical radar systems, A theoretical investigation of the quantum limitations on laser radar system performance was made. These limitations are not a problem in present systems, but they will have to be considered for future, spaceborne systems where high accuracy is desired.
منابع مشابه
Unclassified Ad Defense Documentation Center for Scientific and Technical Information Cameron
متن کامل
Ad Unclassified 417777 Defense Documentation Center for Scientific and Technical Information
Estimation (filtering) theory for dynamical systems is reviewed. Emphasis is on time varying systems and nonstationary stochastic processes. The basic ideas for linear systems are presented in an intuitive manner using time domain techniques and the state variable concept. Both continuous and discrete time systems are discussed. A control problem and the principle of least squares curve fitting...
متن کاملReducing separation formulas to propositional logic
We show a reduction to propositional logic from a Boolean combination of inequalities of the form and , where is a constant and are variables of type real or integer. Equalities and uninterpreted functions can be expressed in this logic as well. We discuss the advantages of using this reduction as compared to competing methods, and present experimental results that support our claims. This rese...
متن کاملUptake of a newly implemented advance care planning program in a dementia diagnostic service.
BACKGROUND Advance care planning (ACP) provides a framework for discussion and documentation of future care preferences when a person loses cognitive capacity. It can assist people in the early stages of dementia to document their preferences for care at later stages of the illness. METHOD A three-stage project introduced ACP to clients with mild cognitive impairment (MCI) or recently diagnos...
متن کامل