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Author: Don Snyder
Publisher: Rand Corporation
ISBN: 0833040448
Category : History
Languages : en
Pages : 77
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Book Description
Outlines criteria for analyzing how sustainment investments affect the operational performance of space systems, focusing on the Global Positioning System; describes a pilot model for such analysis; and examines how model results might be used in policy analysis.
Author: Don Snyder
Publisher: Rand Corporation
ISBN: 0833040448
Category : History
Languages : en
Pages : 77
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Book Description
Outlines criteria for analyzing how sustainment investments affect the operational performance of space systems, focusing on the Global Positioning System; describes a pilot model for such analysis; and examines how model results might be used in policy analysis.
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 0
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Book Description
Aging systems and systems operating longer than their anticipated life span, sometimes because of program slips in follow-on systems, have intensi ed the need for understanding how maintenance and sustainment affect the performance of space systems. In this monograph, we develop a pilot framework for analyzing these and related questions in the ground segment of the Global Positioning System and recommend steps for implementing this framework. In doing so, we address the issue of modeling approach and how to define appropriate metrics of performance. We develop the guidelines for metrics and analytic methods as generally as possible so that they will be useful for other space systems. Much of the spirit of the current metrics used to monitor the maintenance of the ground segments of space systems follows that of metrics used for aircraft. But, space systems have some attributes that differ significantly from those of aircraft systems, and these attributes suggest that the metrics for maintenance and sustainment for space systems be reconsidered. From a modeling perspective, the central difference is that space systems are highly integrated systems in near constant operation, not fleets of aircraft, any one of which can perform the specified mission. This difference leads to three challenges for the analyst. First, the logical metric used in the aircraft realm the fraction of the fleet that can perform the stated mission is not applicable in the space realm. Space command systems function as an integrated whole, and the whole must meet operational mission goals at all times. What is needed for space systems is either a measure or measures that reflect the overall system performance, even when the system is operating nominally. The metric should also be sensitive to sustainment perturbations.
Author: Cristina T. Chaplain
Publisher: DIANE Publishing
ISBN: 1437926401
Category : Technology & Engineering
Languages : en
Pages : 15
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Book Description
The Global Positioning System (GPS), which provides position, navigation, and timing data to users worldwide, has become essential to U.S. national security and a key tool in an expanding array of public service and commercial applications. The Air Force is in the process of modernizing GPS. In light of the importance of GPS, the modernization effort, and international efforts to develop new systems, the auditor undertook a broad review of GPS. Specifically, she assessed progress in: (1) acquiring GPS satellites; (2) acquiring the ground control and user equipment necessary to leverage GPS satellite capabilities; and (3) evaluated coordination among fed. agencies and other org. to ensure GPS missions can be accomplished. Illus.
Author: U. S. Military
Publisher:
ISBN: 9781980469889
Category :
Languages : en
Pages : 148
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Book Description
This is one of a series of systems engineering case studies prepared by the Air Force Center for Systems Engineering. This case study analyzes the Global Positioning System (GPS). It is a satellite-based radio navigation system. It provides suitably equipped users the capability to precisely determine three-dimensional position and velocity and time information on a global basis. The capability was developed to provide the United States and DoD with worldwide navigation, position, and timing capabilities to support military operations by enhancing ground, sea, and air warfighting efficiencies. However, by presidential directive, it was officially made available to the civilian community in 1983. GPS also provides the capability to conduct time transfer for synchronization purposes through the use of precise time standards. GPS supports a secondary mission to provide a highly survivable military capability to detect, locate, and report nuclear detonations in the Earth's atmosphere and in near-Earth space in real time. The study provides a wealth of technical information about this vital satellite-based system and its complex history. The Department of Defense is exponentially increasing the acquisition of joint complex systems that deliver needed capabilities demanded by our warfighter. Systems engineering is the technical and technical management process that focuses explicitly on delivering and sustaining robust, high-quality, affordable solutions. The Air Force leadership has collectively stated the need to mature a sound systems engineering process throughout the Air Force. Gaining an understanding of the past and distilling learning principles that are then shared with others through our formal education and practitioner support are critical to achieving continuous improvement. Table of Contents * Preface * Foreword * Acknowledgements * Chapter 1. SYSTEMS ENGINEERING PRINCIPLES * 1.1 General Systems Engineering Process * 1.1.1 Introduction * 1.1.2 Case Study * 1.1.3 Framework for Analysis * 1.2 GPS Friedman-Sage Matrix * Chapter 2. SYSTEM DESCRIPTION * 2.1 Mission * 2.2 Features * 2.3 System Design * 2.3.1 Space Vehicle * 2.3.2 User Equipment * 2.3.3 Control Segment * 2.3.4 Nuclear Detection System (NDS) * 2.3.5 "NAVSTAR/GPS" * Chapter 3. GPS PROGRAM EXECUTION * 3.1 Early Programs * 3.2 Establishment of a Joint Program * 3.3 Concept/Validation Phase (Phase I) * 3.3.1 Objectives * 3.3.2 Requirements * 3.3.3 Acquisition Strategy * 3.3.4 Trade Studies * 3.3.5 Risk Mitigation * 3.3.6 System Integration * 3.3.7 Systems Engineering * 3.3.8 DSARC II * 3.4 System Development (Phase II, Block I) * 3.4.1 Objectives * 3.4.2 Systems Engineering (JPO) * 3.4.3 Interface Requirements * 3.4.4 Budgetary Impacts to Functional Baseline * 3.4.5 Rockwell International Systems Engineering * 3.4.6 Atomic Clocks * 3.4.7 Control Segment * 3.4.8 User Equipment * 3.4.9 Design Reviews * 3.4.10 System Integration * 3.4.11 ICWG * 3.5 Production and Deployment (Phase III, Block II/IIA) * 3.5.1 Objective * 3.5.2 Acquisition Strategy * 3.5.3 Nuclear Detection System * 3.5.4 Shuttle Impact to Functional Baseline * 3.5.5 User Equipment (UE) Development Testing Effects * 3.5.6 Control Segment * 3.5.7 Requirements Validation & Verification * 3.6. Replenishment Program Block IIR * 3.6.1 Objective * 3.6.2 Acquisition Strategy * 3.6.3 Requirements * 3.6.4 Critical Design Reviews * 3.6.5 User Equipment * 3.7 Full Operational Capability * Chapter 4. SUMMARY * Chapter 5. QUESTIONS FOR THE STUDENT * Chapter 6. REFERENCES
Author: Michael Harvey Levy
Publisher:
ISBN:
Category : Government publications
Languages : en
Pages : 78
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Book Description
Author: United States. USAF Scientific Advisory Board
Publisher:
ISBN:
Category : Air power
Languages : en
Pages : 240
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Book Description
Author: David N. Spires
Publisher:
ISBN:
Category : Astronautics, Military
Languages : en
Pages : 432
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Book Description
Author: Scott Pace
Publisher: RAND Corporation
ISBN:
Category : Fiction
Languages : en
Pages : 438
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Book Description
A comprehensive assessment of the challenges and opportunities created by worldwide access to this revolutionary technology.
Author: United States. Government Accountability Office
Publisher:
ISBN:
Category : Artificial satellites in navigation
Languages : en
Pages : 55
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Book Description
The Global Positioning System (GPS), which provides positioning, navigation, and timing data to users worldwide, has become essential to U.S. national security and a key tool in an expanding array of public service and commercial applications at home and abroad. The United States provides GPS data free of charge. The Air Force, which is responsible for GPS acquisition, is in the process of modernizing GPS. In light of the importance of GPS, the modernization effort, and international efforts to develop new systems, GAO was asked to undertake a broad review of GPS. Specifically, GAO assessed progress in (1) acquiring GPS satellites, (2) acquiring the ground control and user equipment necessary to leverage GPS satellite capabilities, and evaluated (3) coordination among federal agencies and other organizations to ensure GPS missions can be accomplished. To carry out this assessment, GAO's efforts included reviewing and analyzing program documentation, conducting its own analysis of Air Force satellite data, and interviewing key military and civilian officials. GAO's recommendations include that the Secretary of Defense appoint a single authority to oversee development of GPS space, ground control, and user equipment assets, to ensure they are synchronized, well executed, and potential disruptions are minimized.
Author:
Publisher: DIANE Publishing
ISBN: 1428994092
Category :
Languages : en
Pages : 131
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Book Description
