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THIS INVESTIGATION WILL DEVISE GUIDANCE LAWS FOR THE INTERCEPTION OF LOW-EARTH-ORBITING (LEO) TARGETS BY INTERCEPTORS ORIGINATING IN THE ATMOSPHERE. SUITABLE REGIMES FOR BOTH HIGH AND LOW ENERGY INTERCEPTS WILL BE DISCUSSED, AS WELL AS STRATEGEMS FOR ENCOUNTER, ATTACK, AND SURVEILLANCE ACTIVITIES IN THE TERMINAL PHASE. THESE TECHNIQUES WILL BE APPLICABLE TO BOTH MANNED AND UNMANNED VEHICLES. EXPLI ...

BECAUSE NONMINIMALLY ARTICULATED (OR KINEMATICALLY REDUNDANT) ROBOT MANIPULATORS HAVE EXTRA DEGREES OF FREEDOM WITH WHICH TO MOVE AND ORIENT END EFFECTORS IN THE WORKSPACE, THEY OFFER A NUMBER OF ADVANTAGES OVER CURRENTLY AVAILABLE DESIGNS. FROM THE VIEWPOINT OF PROGRAMMING AND CONTROL, HOWEVER, THERE ARE POTENTIAL PROBLEMS DUE TO THE INCREASED COMPLEXITY OF THE KINEMATICS AND DYNAMICS. A SIX MONT ...

RECENT RESEARCH IN LINEAR MULTIVARIABLE CONTROL THEORY BASED ON THE STABLE FACTORIZATION APPROACH NOW MAKES IT POSSIBLE TO DEVELOP A SYSTEMATIC APPROACH TO THE DISIGN OF ROBUST DECENTRALIZED CONTROL SYSTEMS. ESPECALLY, CURRENTLY AVAILABLE RESULTS INCLUDE, (1) CONDI TIONS TO DETERMINE WHEN THERE EXISTS A STABILIZING CONTROLLER THAT IS ROBUST AGAINST A SPECIFIED AMOUNT OF UNCERTAINITY, AND (2) A PAR ...

SECURE VOICE COMMUNICATIONS OVER NARROW (10 - 12.5 KHZ) CHANNELS IS BECOMING INCREASINGLY IMPORTANT. SPEECH COMPRESSIION FOR USE OVER SUCH NARROW CHANNELS MUST OPERATE AT 9.6 KBPS. EXISTING SPEECHCOMPRESSION APPROACHES AT 9.6 KBPS SUFFER FROM PROBLEMS SUCH AS SENSITIVITY TO INPUT NOISE, SENSITIVITY TO CHANNEL ERROWS, INADEQUATE SPEECH QUALITY, OR SEVERE COMPUTATIONAL REQUIREMENTS. IN THIS PROPOSAL ...

HERMETIC PROTECTION OF OPTICAL FIBER IS REQUIRED FOR MANY COMMUNICATIONS APPLICATIONS DUE TO THE DEGRADING EFFECTS OF MOISTURE ON THE LONG TERM STRENGTH OF GLASS. THE PRIMARY OBJECTIVE OF THIS PROGRAM IS TO EVALUATE VARIOUS MATERIALS FOR PLASMA DEPOSITION AS AN EFFECTIVE TECHNIQUE FOR HERMETICPROTECTION OF OPTICAL FIBER. COATINGS MATERIALS CONSIDERED FOR PERFORMANCE EVALUATION ARE CLASSIFIED AS DI ...

BULK GLASS COMPONENTS PREPARED FROM FLUORIDE GLASSES SUCH ASWINDOWS, LENSES AND DOMES EXHIBIT BROAD BAND LOW LOSS TRANSMISSION FROM NEAR UV TO MID IR WAVELENGTHS. THE GOALS OF THE PROGRAM ARE TO DEVELOP A REPRODUCEABLE PROCESS FOR THE PREPARATION OF HIGH PURITY FLUORIDE GLASSES IN BULK FORM. AN ADDITIONAL GOAL IS THE PREPARATION OF HIGH QUALITY DEVITRIFICATION FREE LARGE COMPONENTS ON THE ORDER OF ...

GAAS, WHICH HAS BEEN USED FOR MONOLITHIC SURFACE ACOUSITC WAVE (SAW) DEVICES, IS ALSO THE MICROELECTRONIC MATERIAL OF CHOICE FOR HIGH SPEED, HIGH-FREQUENCY APPLICATIONS, AD ITS COMBINATION OF PIEZOELECTRIC AND SEMICONDUCTING PROPERTIES OFFERS THE OPPORTUNITY TO INTEGRATE SAW AND ELECTRONIC DEVICES IN THE SAME CHIP. SPIRE PROPOSES TO IMPLEMENT THIS INTEGRATION BY THE EPITAXIAL DEPOSITION OF THINFIL ...

ELECTRODE EROSION LIMITS THE LIFETIME OF PULSED SPARK GAPS TO APPROXIMATELY 10 AND 10 PULSES WITH THE PRESENT STATE OF THE TECHNOLOGY. SPIRE CORPORATION PROPOSES TO MAKE NEW TYPES OF REFRACTORY MATERIALS FOR ELECTRODE COATINGS BY ION IMPLANTATION, WITH THE OBJECTIVE OF EXTENDING THE LIFETIME TO BETWEEN 10 AND 10 PULSES. TO OUR KNOWLEDGE, ION IMPLANTATION HAS NEVER BEEN TESTED FOR THIS APPLICATION. ...

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