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An airspace model has been developed to explore the feasibility of and automation related benefits to Concept Element (CE) 6 of NASA's Distributed Air-Ground Traffic Management environment. CE-6 embodies en-route trajectory negotiation between pilot and controller. This model is intended to provide a highfidelity analysis tool for evaluating the benefit mechanisms of this CE. Recent studies have shown that there is a significant economic and airspace capacity benefit to Concept Element 6, and these benefits have been referred to as "Golden Nuggets" (GN). These benefits have been broken down into three mechanisms: basic data exchange (GN1), decision support tool (DST) and Aeronautical Data Link System (ADLS) integration (GN2), and integration of DST and aircraft Flight Management System (FMS) with ADLS (GN3). GN1 allows for more accurate trajectory predictions, leading to improved DST performance, and thus a reduced controller workload and higher airspace capacity. GN2 provides impr oved intent knowledge within DSTs, and automated message composition and broadcasting. GN2 eliminates the requirement for controllers to enter clearances into a DST, a procedure that is frequently neglected at high workload, thereby improving DST performance when it is most needed. GN3 allows controllers to uplink complex clearances as a single instruction, and pilots to accept such clearances with minimal effort. In this paper, we discuss the development of a fast-time, human performance and airspace simulator, intended to model the proposed benefits of GN1, GN2, and GN3.

A primary goal of the Performance-Based Operations (PBO) concept is to allow regulations and procedural requirements to be outlined in a set of general performance terms. The PBO framework seeks to specify the minimum system performance requirements for any given NextGen operation without explicitly recommending any methodologies or technologies to meet these requirements. This paper outlines a framework for evaluating various performance-driven operations. Moreover, if discrete levels of performances of subsystems are available within a given segment of a trade space area, the framework should be sufficient to identify possible combinations of subsystems performance requirements that will achieve the same, or similar total system performance. aircraft position information to be passed between participating aircraft. Sources of Uncertainty and ModelingMany different factors (such as performance of the supporting equipment and/or weather impact on a communication signal) can cause the delay or loss of communication known as the communication error/noise effect. The RCP [20] level requires that a communication process has to be done within a specific time frame (communication transaction time). Otherwise the communication process will be dropped. To mimic this, we model the communication noise as a truncated normal distributed random variable. That is:

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