James R Wertz Microcosm Inc Wiley J Larson United States Air Force Academy

1.1 Introduction and Overview

1.2 The Space Mission Life Cycle

1.3 Step 1: Definition of Mission Objectives

1.4 Step 2: Preliminary Estimate of Mission Needs, Requirements, and Constraints

Space mission analysis and design begins with one or more broad objectives and constraints and then proceeds to define a space system that will meet them at the lowest possible cost Broad objectives and constraints are the key to this process. Procurement plans for space systems too often substitute detailed numerical requirements for broad mission objectives. To get the most performance for the money spent, we must require of the system only what it can reasonably achieve. Thus, while our overall objectives to communicate, navigate, or observe will generally remain the same, we will achieve these objectives differently as technology and our understanding of the process and problem evolve. This chapter summarizes, and the book as a whole details, this process of defining and refining both what is to be done and what mission concept will do it at the lowest cost

There are now a number of references available on the mission design process and the definition of mission objectives. Rechtin [1991] and Ruskin and Estes [1995] provide general discussions of this process. Shishko [1995] provides an overview from the NASA perspective and Przemieniecki [1993] gives a similar treatment for defense missions. Davidoff [1998] and Wertz and Larson [1996] discuss this process from the perspective of very low-cost missions and methods for dramatically reducing mission cost, respectively. Boden and Larson [19%] discuss the analysis and design process specifically for mission operations. Finally, Kay [1995] examines the fundamental difficulty of doing technical trades within a democratic political environment

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