| Superconducting Niobium Thin-Film Gradiometer Technology Program |
14 MAR 1983 |
|
| Authors:
Spencer A. Buckner; TEXAS INSTRUMENTS INC DALLAS EQUIPMENT GROUP
|
 | Dc SQUIDs with 2.5 micron square niobium-aluminum oxide-niobium tunnel junctions and titanium resistive shunts have been fabricated. The SQUID inductance was 0.9 nH, and the shunt resistors were approximately 10 ohms. With the SQUIDs operated in a small-signal amplifier mode the minimum white noise of the SQUIDs was measured. Low frequency noise was measured form 0.005 to 2 Hz with the SQUIDs operated in a closed-looped negative-feedback mode. A straight ... |
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| Thermal Imaging Now and in the Future. |
1983 |
|
| Authors:
G. S. Hopper; TEXAS INSTRUMENTS INC DALLAS EQUIPMENT GROUP
|
| Thermal imaging system technology has grown from a lab curiosity in the early sixties to the point where today it is a key element in military night operations. This paper briefly reviews the historical developments, describes the current state of the art, and discusses the main aspects of advanced programs aimed at future applications. (Author. Copyright 1983 Society of Photo-Optical Instrumentation Engineers.) |
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| Impact of Optics Design Decisions upon Line-of-Sight Stabilization. |
1983 |
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| Authors:
M. Masten; J. Hilkert; TEXAS INSTRUMENTS INC DALLAS EQUIPMENT GROUP
|
| The process of designing line-of-sight stabilization systems is an interdisciplinary process that requires interaction of mechanical engineers, electronics designers, and servo analysts as well as the optics engineer. The decisions made by the optics designer can have a significant impact upon the final system configuration and performance that is achieved. The stabilization mechanism must support the optical package, must not obstruct the line-of-sight, and must be balanced in order to ... |
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| Superconductive Niobium Oxide Tunnel Device Program |
15 APR 1982 |
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| Authors:
Spencer A. Buckner; TEXAS INSTRUMENTS INC DALLAS EQUIPMENT GROUP
|
| The purpose of this program was to develop the technology for the fabrication of small-area Josephson tunnel junctions with niobium electrodes for use as microwave detectors and mixers. Niobium-niobium oxide-lead junctions were used to establish processes for sputter cleaning and sputter oxidizing the niobium base electrode. When these processes were established, niobium-niobium oxide-niobium junctions were made by sputtering the base electrode, sputter cleaning and sputter oxidizing the base electrode in ... |
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| Investigation of an Exploratory Development Model of the 3HE Free Precession Gradiometer |
26 FEB 1982 |
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| Authors:
Douglas D. McGregor; TEXAS INSTRUMENTS INC DALLAS EQUIPMENT GROUP
|
| This report describes the results of an investigation of an exploratory development model (XDM) of the 3He free precession gradiometer. The gradiometer is intended for use in a mine application. The investigation included the construction and evaluation of the XDM 3He gradiometer, an experiment to determine the effect of sensor orientation, an experiment to assess the effect of magnetic gradients on the magnetometer operation, and a detection test in which ... |
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| Global Positioning Systems (GPS). Manpack/Vehicular User Equipment (MVUE). Volume III. Set Description. |
15 AUG 1979 |
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| Authors:
TEXAS INSTRUMENTS INC DALLAS EQUIPMENT GROUP
|
| This volume provides module level descriptions for each of the modules which make up the MVUE software and hardware subsystems. (Author) |
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| Global Positioning Systems (GPS). Manpack/Vehicular User Equipment (MVUE). Volume II. Set Description. |
15 AUG 1979 |
|
| Authors:
TEXAS INSTRUMENTS INC DALLAS EQUIPMENT GROUP
|
| This volume describes the design of the MVUE set as implemented in Phase I of GPS, to include set description, software overview; and software/hardware subsystem descriptions. (Author) |
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| Global Positioning Systems (GPS). Manpack/Vehicular User Equipment (MVUE). Volume I. |
15 AUG 1979 |
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| Authors:
TEXAS INSTRUMENTS INC DALLAS EQUIPMENT GROUP
|
| Describes Texas Instrument's efforts to design and develop an alternate Manpack/Vehicular User Equipment (MVUE) set for use in the concept validation phase of GPS. Volume I summarizes design-to-cost goals and results; production engineering program, and field test reliability information. Includes maintainability analysis and fault isolation to achieve mean-time-to-repair goals. (Author) |
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| Global Positioning Systems (GPS). High Dynamic User Equipment (HDUE). Volume I. |
10 AUG 1979 |
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| Authors:
TEXAS INSTRUMENTS INC DALLAS EQUIPMENT GROUP
|
| This HDUE Final Report has documented the technology, both hardware and software, and the philosophy that Texas Instruments implemented in their High Dynamic User Equipment for the GPS concept validation phase. The overall set as well as its individual modules has been explained. Texas Instruments HDUE concepts, techniques, and results of design-to-cost, producibility, reliability, and maintainability have been put forth as well. |
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| Global Positioning Systems (GPS) High Dynamic User Equipment. (HDUE) Volume III. Set Description. |
01 AUG 1979 |
|
| Authors:
TEXAS INSTRUMENTS INC DALLAS EQUIPMENT GROUP
|
| This Volume Contains descriptions of both software/hardware modules in the HDUE system, which includes receiver software, master state control, navigation software, executive software, receiver LRU and navigation LRU descriptions. (Author) |
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| Global Positioning Systems (GPS) High Dynamic User Equipment (HDUE). Volume II. Set Description. |
01 AUG 1979 |
|
| Authors:
TEXAS INSTRUMENTS INC DALLAS EQUIPMENT GROUP
|
| Describes Texas Instruments design of the HDUE set as implemented during Phase I of the GPS program, including system description; HDUE receiver control, Master Control, Navigation and Executive Subsystems; and Hardware System Description. (Author) |
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| Premobilization of R/V INDIAN SEAL |
31 MAY 1979 |
49 pages |
| Authors:
Thomas M. Mitchell; TEXAS INSTRUMENTS INC DALLAS EQUIPMENT GROUP
|
 | A summary is presented of the premobilization effort conducted by Texas Instruments Incorporated to prepare the R/V INDIAN SEAL for later mobilization by another contractor for LRAPP operations during 1979. |
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| CHURCH STROKE II Oceanographic Services |
26 Mar 1979 |
15 pages |
| Authors:
Dale Eichenberger; TEXAS INSTRUMENTS INC DALLAS EQUIPMENT GROUP
|
| This report describes the work done by Texas Instruments to mobilize the R/V Indian Seal as a test platform, conduct an at sea calibration exercise and engineering evaluation, and perform an environmental acoustic measurement program in conjunction with the Church Stroke II exercise. |
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| Geophysical Studies for Missile Basing. Seismic Risk Studies in the Western United States. |
20 DEC 1978 |
|
| Authors:
James C. Battis; TEXAS INSTRUMENTS INC DALLAS EQUIPMENT GROUP
|
| Seismic risk studies were conducted for two military facilities in the western United States: Luke Air Force Base, Arizona, and the Nevada Test Site(NTS). Both facilities are potential sites for MX missile system installations. For each site, peak around motion risk curves, for annual risks ranging between values of 1.0 and 0.001, were estimated, based on seismicity characteristics of the risk regions surrounding each facility. Difficulties in evaluating the risk ... |
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| VELA Network Evaluation and Automatic Processing Research. |
22 NOV 1978 |
|
| Authors:
Robert L. Sax; TEXAS INSTRUMENTS INC DALLAS EQUIPMENT GROUP
|
| The second part of the work performed covered as follows: Evaluated SRO and ASRO stations by expanding the data base of operational stations to include at least one calendar year of data to determine the detection and discrimination capability of the stations, and to determine the performance characteristics of the detector used at the stations. Performed research on signal detection by investigating techniques to reduce the false alarms of detectors ... |
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| Continuation of the Seismic Research Observatories Evaluation. |
20 NOV 1978 |
|
| Authors:
Leonard C. Weltman; Robert R. Oliver; TEXAS INSTRUMENTS INC DALLAS EQUIPMENT GROUP
|
| This report presents the results of an ongoing evaluation of the Seismic Research Observatories performed by Texas Instruments Incorporated at the Seismic Data Analysis Center in Alexandria, Virginia. Seven stations of the types noted are evaluated: SRO: Albuquerque, New Mexico (ANMO), Mashhad, Iran (MAIO), Chiang Mai, Thailand (CHTO); ASRO: Charters Towers, Australia (CTAO), La Paz (Zongo), Bolivia (ZOBO), Kabul, Afghanistan (KAAO), Matsushiro, Japan (MAJO). The major area of investigation in ... |
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| Event Identification - Applications to Area of Interest Events. |
13 NOV 1978 |
|
| Authors:
R. L. Sax; A. G. R. Bell; D. L. Dietz; A. C. Strauss; J. S. Shaub; TEXAS INSTRUMENTS INC DALLAS EQUIPMENT GROUP
|
| An integrated event identification system has been developed to operate on an 'Area of Interest' data base. This system includes an automated measurement and analysis section using the IBM 360/44 computer and an interactive editing and identification section using the PDP-15/50 computer. Amplitude measurements are made on both short-period and long-period data and serve as the basis for computing most of the discriminants. Other discriminants include mean instantaneous frequency and ... |
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| Application of a Combined Source Model for Seismic Discrimination. |
25 OCT 1978 |
|
| Authors:
Helmut Y. A. Hsiao; TEXAS INSTRUMENTS INC DALLAS EQUIPMENT GROUP
|
| The purpose of this study has been to use the observed long-period teleseismic surface wave data of earthquakes and presumed underground explosions to determine the source mechanisms and to use these source mechanism estimates to discriminate between the two classes of events. In order to demonstrate this purpose, fifteen events have been selected and analyzed for the Russian Eastern Kazakh (EKZ) region, central and northern Eurasia, and the United States ... |
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| Narrow and Broad Region Dispersion of Long-Period Surface Waves. |
11 OCT 1978 |
|
| Authors:
Rudolf Unger; TEXAS INSTRUMENTS INC DALLAS EQUIPMENT GROUP
|
| Examples of both narrow and broad region dispersion analysis for long-period surface waves are presented. Narrow region dispersion analysis of Kuriles/Kamchatka earthquake signals recorded at Guam, by means of moving-window maximum entropy spectral analysis, indicates strong multipathing in the 3.0 to 4.5 km/sec group velocity range, causing poor polarization filter performance. In contrast, between 2.0 and 3.0 km/sec the signals are well defined, resulting in a good polarization filter response. ... |
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| Iranian Long Period Array Support |
30 SEP 1978 |
17 pages |
| Authors:
J. G. Wester; K. F. Heath; TEXAS INSTRUMENTS INC DALLAS EQUIPMENT GROUP
|
| This report summarizes activities under the program of technical support for the Iranian Long Period Array. The Iranian Long Period Array system consists of an array of seven remote seismic sensor installations, data communication links, and a central recording station. Personnel from the University of Tehran Institute of Geophysics operate the system. An on-site technical representative has been provided by Texas Instruments under contract from the Air Force Technical Applications ... |
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| Extraction of Seismic Waveforms. |
29 SEP 1978 |
|
| Authors:
Alan C. Strauss; TEXAS INSTRUMENTS INC DALLAS EQUIPMENT GROUP
|
| This report considers the effects on detectability and measurability resulting from attempts to extract seismic waveforms by application of cascaded processors and polarization filters. Previous work has shown that bandpass or Wiener filters (when cascaded with the three-component surface wave adaptive processor) caused improvements of as much as 0.8 m sub b units in the 50 percent detection threshold of surface waves. This report shows that by using a larger ... |
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| Short-Period Noise Envelope Statistics: A Basis for Envelope Detector Design. |
26 SEP 1978 |
|
| Authors:
Rudolf Unger; TEXAS INSTRUMENTS INC DALLAS EQUIPMENT GROUP
|
| This report focuses on the use of certain detection statistics, in particular the instantaneous amplitude or envelope, and the instantaneous power, in the design of a controlled false alarm rate detector. To achieve false alarm rate control, the detection statistic must be stationary, but need not be Gaussian. Parameters of a Gaussian process can be conveniently transformed into a stationary, normalized detection statistic. For an envelope detector the normalization consists ... |
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| Detection Performance of Time-Varying Adaption Rate Adaptive Beamformer. |
15 SEP 1978 |
|
| Authors:
Wen-Wu Shen; TEXAS INSTRUMENTS INC DALLAS EQUIPMENT GROUP
|
| The previously developed time-varying adaptation rate adaptive beamformer (ABF) was modified for the purpose of using a fixed set of design parameters in different levels of noise and signals. The ABF performance was evaluated in terms of its capability to suppress seismic coda wavetrains of strong earthquakes, accuracy of its bodywave magnitude (m sub b) measurements and detection capability, as compared with those of single sites and the conventional beamsteer ... |
|
| Application of Ringdal's Method to Unbiased Measurement of the Ms-mb Relationship. |
31 AUG 1978 |
|
| Authors:
Alan C. Strauss; TEXAS INSTRUMENTS INC DALLAS EQUIPMENT GROUP
|
| Ringdal's maximum likelihood method of removing magnitude bias was tested by removing the apparent bias of surface wave magnitude estimates. Bias removal was convincingly demonstrated by comparing maximum likelihood estimates of M sub s obtained by a single sensor to those obtained by an array at the Alaskan Long Period Array (ALPA) site. Since the beamformed array has a lower detection threshold than the single-sensor reference site, it can serve ... |
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| Feasibility Study of Mixed-Signal Separation Techniques. |
12 JUL 1978 |
|
| Authors:
Wen-Wu Shen; TEXAS INSTRUMENTS INC DALLAS EQUIPMENT GROUP
|
| A fesibility study to enhance a weaker signal hidden in the stronger wavetrains of different seismic sources was conducted. Two array beamforming methods were developed for and applied to the mixed-signal problem: one is the adaptive beamformer (ABF) and the other is array shading technique. The ABF operates in the time domain, requires no a priori information, and can be used for a front-end detector. The array shading technique is ... |
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| Iranian Long Period Array Support |
30 APR 1978 |
|
| Authors:
L. J. Spieker; W. Daniel Jr.; K. F. Heath; TEXAS INSTRUMENTS INC DALLAS EQUIPMENT GROUP
|
| This report summarizes activities under the program of technical support for the Iranian Long Period Array. The Iranian Long Period Array system consists of an array of seven remote seismic sensor installations, data communication links, and a central recording station. Personnel from the University of Tehran Institute of Geophysics operate the system. An on-site technical representative has been provided by Texas Instruments under contract from the Air Force Technical Application ... |
|
| Iranian Long Period Array Support |
28 APR 1978 |
|
| Authors:
L. J. Spieker; P. W. Hudson; TEXAS INSTRUMENTS INC DALLAS EQUIPMENT GROUP
|
| This report summarized continuing activities on the program of technical support and system modification for the Iranian Long Period Array. The Iranian Long Period Array system consists of an array of seven remote seismic sensor installations, data communication links, and a central recording station. Personnel from the University of Tehran Institute of Geophysics (UTIG) operate the system. An on-site technical representative was provided by Texas Instruments under a previous phase ... |
|
| The Detection Association Processor. |
31 MAR 1978 |
|
| Authors:
Nolan S. Snell; TEXAS INSTRUMENTS INC DALLAS EQUIPMENT GROUP
|
| This report concerns the design of a seismic event detection association processor. This processor consists of algorithms which automatically convert seismic signal detections from a network of stations stored centrally as a list of station detection bulletins into a corresponding event list, while discarding spurious detection, or false alarms. These algorithms process single site short-period detections as well as array detections. An automatic depth estimate is also performed. Testing via ... |
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| Automatic Detection, Timing and Preliminary Discrimination of Seismic Signals with the Instantaneous Amplitude, Phase and Frequency. |
27 MAR 1978 |
|
| Authors:
Rudolf Unger; TEXAS INSTRUMENTS INC DALLAS EQUIPMENT GROUP
|
| The feasibility is evaluated of applying instantaneous amplitude, phase and frequency measurements to automatically detect, time and identify seismic events. Detection based on phase measurements is shown to be in principle 6 dB more sensitive than detection based on amplitude measurements. A phase detection and timing algorithm, using a priori known dispersion characteristics, is demonstrated to time the onset of simulated teleseismic long-period surface waves within 30 seconds accuracy in ... |
|
| Relationships Between Noise and mb Bias Applied to Seismic Station Site Selection and Performance Evaluation. |
23 MAR 1978 |
|
| Authors:
Donald L. Dietz; Robert L. Sax; TEXAS INSTRUMENTS INC DALLAS EQUIPMENT GROUP
|
| An analysis of forty-six stations with known m sub b bias, noise amplitude, and tectonic structure showed that a relationship exists among these three parameters. A wide range of slopes in the relationship of noise magnitude and bias were examined. A slope of one applied to several normal groupings of noise levels provided a precise means of predicting the performance of seismic stations within large geographical areas. This interpretation resulted ... |
|
| Laser Rangefinder/Tank Thermal Sight Integration Study. |
28 FEB 1978 |
|
| Authors:
TEXAS INSTRUMENTS INC DALLAS EQUIPMENT GROUP
|
| This report documents the results of a study to analyze a government-proposed design concept for integrating AN/GVS-5 Laser Rangefinder (LRF) modules into the AN/VSG-2 Tank Thermal Sight (TTS). The primary objectives of the study were to determine the compatibility of the two systems and to assess the impact of the proposed integration on the recurring costs associated with the production of the TTS systems. |
|
| Midwater Acoustic Measurement System - PAR and ACODAC |
28 Feb 1978 |
131 pages |
| Authors:
TEXAS INSTRUMENTS INC DALLAS EQUIPMENT GROUP
|
| This report describes the work performed by Texas Instruments under Contract N00014-75-C-0107 during the period 16 October 1974 to 1 March 1978. Contract N00014-75-C-0107 includes the development and construction of the Programmable Acoustic Recorder (PAR) electronics together with the development of operational software. Effort under this contract also includes acceptance testing of the PAR system electronics; PAR mechanical design, construction, and testing; underwater cable and hydrophone/pre-amp assembly design and construction; ... |
|
| VELA Network Evaluation and Automatic Processing Research. |
03 JAN 1978 |
|
| Authors:
Robert L. Sax; TEXAS INSTRUMENTS INC DALLAS EQUIPMENT GROUP
|
| Work in the following areas is summarized: (1)SRO Evaluation; (2)Detection, Waveform Extraction, and Magnitude Estimation; (3)Event Identification Study; (4)Surface Wave Study; and (5)Seismic Data Management. |
|
| Extraction of Long-Period Surface Waves. |
08 DEC 1977 |
|
| Authors:
Stephen S. Lane; TEXAS INSTRUMENTS INC DALLAS EQUIPMENT GROUP
|
| Gains from a cascaded Wiener filter, three component adaptive (TCA) filter, and prewhitened matched filter were measured for various orders of application to long-period surface waves buried in seismic noise. It was found that the gain of the cascaded Wiener filter and three component adaptive filter was greater than the sum of their individual gains, and that this was the best order of application, but that following them with the ... |
|
| The Extended Interactive Seismic Processing System (ISPSE). |
05 DEC 1977 |
|
| Authors:
Jeffrey S. Shaub; David G. Black; TEXAS INSTRUMENTS INC DALLAS EQUIPMENT GROUP
|
| The primary intention of this report is to provide a comprehensive user manual for the Extended Interactive Seismic Processing System (ISPSE). ISPSE supports an interactive graphics environment on the PDP-15 computer located at the Seismic Data Analysis Center (SDAC) for the purpose of analyzing long-and short-period seismic waveforms. In addition to general signal analysis functions, ISPSE demonstrates the feasibility of utilizing interactive graphics for short-period event discrimination as described in ... |
|
| Continuation of the Seismic Research Observatories Evaluation. |
16 NOV 1977 |
|
| Authors:
Alan C. Strauss; Leonard C. Weltman; TEXAS INSTRUMENTS INC DALLAS EQUIPMENT GROUP
|
| This report presents the results of a continued evaluation of the Seismic Research Observatory stations performed by Texas Instruments Incorporated at the Seismic Data Analysis Center in Alexandria, Virginia. During the time period this evaluation was carried out, data were available from six stations-Albuquerque, New Mexico (ANMO); Guam, Marianas Islands (GUMO); Mashhad, Iran (MAIO); Narrogin, Western Australia (NWAO); Taipei, Taiwan (TATO); and Wellington (South Karori), New Zealand (SNZO). The major ... |
|
| Extraction of Long-Period Bodywaves. |
14 NOV 1977 |
|
| Authors:
Stephen S. Lane; TEXAS INSTRUMENTS INC DALLAS EQUIPMENT GROUP
|
| A polarization filter for long-period bodywaves was developed and tested on 100 events from the Kurile Islands and measured at the Guam Seismic Research Observatory. Fifty percent detection thresholds before processing were m sub b = 5.5 and 5.1 for P and S waves, respectively, and were unchanged by the filter unless a substantial false alarm rate was allowed, when the P threshold was reduced to m sub b = ... |
|
| The Deflection Detector - Its Theory and Evaluation on Short-Period Seismic Data. |
02 NOV 1977 |
|
| Authors:
Mark J. Shensa; TEXAS INSTRUMENTS INC DALLAS EQUIPMENT GROUP
|
| This study investigates the application of a deflection detector to short-period seismic data. In general, for power detectors, no single filter will be optimal for a large variety of signals in a dynamic noise environment. The deflection detector represents an attempt to adapt to such a situation by utilizing individual FFT frequency cells as a bank of filters which can accommodate a broad variety of signals. The performance of the ... |
|
| Study of Adaptive Beamforming Algorithms for Low Magnitude Seismic P-Wave Detection. |
01 NOV 1977 |
|
| Authors:
Wen-Wu Shen; TEXAS INSTRUMENTS INC DALLAS EQUIPMENT GROUP
|
| A linear adaptive algorithm was developed for array beamforming purposes. The design goal for the algorithm was to minimize the squared filter output subject to the constraint which allows energy propagating from the array steering direction to pass without being distorted. The adaptive filter coefficients were designed as time-verying filters applied to each channel subject to the above constraints. The adaptation rate was inversely varied with filter output and total ... |
|
| Seismic Data Preparation Procedures. |
20 OCT 1977 |
|
| Authors:
A. William Schmidt; Kimberly S. Wilson; TEXAS INSTRUMENTS INC DALLAS EQUIPMENT GROUP
|
| The computer programs currently being used to prepare seismic data for analysis on the PDP-15 computer, and the flow of data through them, are described briefly. The programs are being run by Texas Instruments Incorporated on the IBM 360/44 at the Seismic Data Analysis Center. New programs developed during the contract period are described in some detail. Some suggestions for future work are provided. (Author) |
|
| Determination of Seismic Source Parameters from Long-Period Surface Wave Data. |
31 AUG 1977 |
|
| Authors:
David Sun; TEXAS INSTRUMENTS INC DALLAS EQUIPMENT GROUP
|
| Far-field Rayleigh and Love waves observed on a long-period seismic network were studied to characterize presumed underground nuclear explosions. These occurred at the United States Nevada Test Site (NTS), the Russian eastern Kazakh (EKZ) region, and at the site of presumed peaceful nuclear explosions (PNE) in the north Caspian Sea region. The observation stations available for this study included Alaskan Long Period Array (ALPA), Large Aperture Seismic Array (LASA), Norwegian ... |
|
| VELA Network Evaluation and Automatic Processing Research. |
01 JUL 1977 |
|
| Authors:
Robert L. Sax; TEXAS INSTRUMENTS INC DALLAS EQUIPMENT GROUP
|
| This report summarizes work in the following areas: (1) Evaluation of ILPA and SRO data; (2) Development of detection methods; (3) Methods of extracting long-period event waveforms; (4) Interactive seismic signal processing; and (5) Determining path corrections and extracting source parameters from long-period data. |
|
| Josephson Junction Technology Program. Phase I. |
21 APR 1977 |
|
| Authors:
Forrest D. Colegrove; Spencer A. Buckner; David N. McQuiddy; Jerry D. Holmes; TEXAS INSTRUMENTS INC DALLAS EQUIPMENT GROUP
|
| A search has been made of Naval Surveillance and communications systems in the frequency range DC to above 100 GHz for the purpose of identifying systems in which the application of Josephson effect devices might improve performance. Magnetic anomaly detection, ELF communications, fast digital processing and some radar applications were examined and found to be potential candidates for superconducting devices. Analyses of systems considered and rejected are also included. (Author) ... |
|
| VELA Network Evaluation and Automatic Processing Research. |
04 APR 1977 |
|
| Authors:
Robert L. Sax; TEXAS INSTRUMENTS INC DALLAS EQUIPMENT GROUP
|
| This second quarterly report summarizes progress under the VELA Network and Automatic Processing research Program. Work in the following areas is summarized: (1) Evaluation of ILPA and SRO data; (2) Development of detection methods; (3) Methods of extracting long-period event waveforms; (4) Interactive seismic signal processing; (5) Determining path corrections and extracting source parameters from long-period data. |
|
| System Avionic Architectures for RPVs. |
APR 1977 |
|
| Authors:
R. Allen; L. Chamberlin; J. Early; J. Graham; W. Grimes; TEXAS INSTRUMENTS INC DALLAS EQUIPMENT GROUP
|
| Results are presented from a 6-month study to design an avionic digital processing system for the multi-mission Advanced Remotely Piloted Vehicle (ARPV) application. The recommended approach is a microprocessor-based design consisting of a distributed processing network with modular processor/memory elements (PEs) interconnected via a MIL-STD-1553A data bus. The objective was to design a digital processing system providing not only adequate performance for the anticipated ARPV missions but also the lowest ... |
|
| VELA Network Evaluation and Automatic Processing Research. |
06 JAN 1977 |
|
| Authors:
Robert L. Sax; TEXAS INSTRUMENTS INC DALLAS EQUIPMENT GROUP
|
| This first quarterly report summarizes progress under the VELA Network and Automatic Processing Research Program. Work in the following areas is summarized: evaluation of ILPA and SRO data, development of detection methods, methods of extracting long-period event waveforms, interactive seismic signal processing, determining path corrections and extracting source, and parameters from long-period data. |
|
| Video Controlled FLIR Focus. |
NOV 1976 |
|
| Authors:
E. Elwell; Joseph Lewis; K. Stelzenmuller; TEXAS INSTRUMENTS INC DALLAS EQUIPMENT GROUP
|
| The objective of the program was to invent, design, breadboard and demonstrate an automatic focusing device and a dynamic range expansion system to be used with FLIR sensors. The scene analysis, breadboard implementation and test results of both tasks are covered. |
|
| Preliminary Evaluation of the Seismic Research Observatories. |
29 OCT 1976 |
|
| Authors:
Alan C. Strauss; TEXAS INSTRUMENTS INC DALLAS EQUIPMENT GROUP
|
| This report describes the preliminary evaluation of five of the projected ten Seismic Research Observatories (SRO). This evaluation was performed by Texas Instruments Incorporated at the Seismic Data Analysis Center in Alexandria, Virginia. The major areas of study in the evaluation were as follows: Analysis of RMS noise levels, RMS noise trends, and noise spectral content; Estimation of the detection capability of the individual stations; and Analysis of M sub ... |
|
| A Time-Variant Wiener Filter for Dispersed Waveforms. |
29 OCT 1976 |
|
| Authors:
Rudolf Unger; TEXAS INSTRUMENTS INC DALLAS EQUIPMENT GROUP
|
| A time-variant Wiener filter based on the regionally dispersive characteristics of long-period surface waves is presented. The dispersion curves are determined with maximum entropy spectral analysis. The filter performance is tested with synthetic chirp waveforms and with real seismic data. The filter enhances the estimation of signals and, in particular, the surface wave magnitude measurability, for waveforms with signal-to-noise ratios down to dB RMS. For lower signal-to-noise ratios the signal ... |
|
| Development of Three Signal Processing Techniques. VELA Network Evaluation and Automatic Processing Research. |
29 OCT 1976 |
|
| Authors:
Stephen S. Lane; TEXAS INSTRUMENTS INC DALLAS EQUIPMENT GROUP
|
| The gain in signal-to-noise ratio with respect to a bandpass filter was investigated as a function of input signal-to-noise ratio for a Wiener filter, a matched filter, and the three component adaptive filter. Each processor was applied to two southern Kamchatka events recorded at a single-site at the Alaskan Long Period Array (ALPA) and buried in two noise samples recorded there. A representative southern Kamchatka earthquake seismogram was formed by ... |
|
Reports by Corporate Author
