For this analysis, the flight guidance subfunction is considered to be the strategic part of flight management and the flight control subfunction is the tactical part. The strategic aspect of flight management is described further below.
Flight guidance
Flight guidance is the function of developing a desired plan of flight, determining necessary resources, monitoring the progress of the flight, assessing the current situation, and adjusting the plan of flight as necessary. In this definition, it is important to note that the plan of flight is much more encompassing than what is traditionally considered a “flight plan.” Flight guidance is further decomposed into the following elements.
Planning: This element involves the determination of the destination airport and other intermediate goals to include: flight-environmental factors, Federal Aviation Regulations (FARs) and other pertinent regulations, flight-planning procedures, and the resources necessary to obtain those goals. The planning goals include the determination of lateral, vertical, and speed (or speed and time) routing subgoals.
Monitoring: This element involves the gathering of all available information about the current vehicle state and the desired vehicle state. That is, where am I, where am I supposed to be? This includes gathering information relative to the current environmental factors, FARs and other pertinent regulations and procedures, and the available resources (e.g., fuel, crew endurance).
Assessing: This element is the activity of comparing the current vehicle state (e.g., current lateral position) with the desired state (the current subgoal from planning, e.g., the planned lateral position). This is effectively a feedback loop in terms of tracking any differences between the current and desired states, as the basis for determining the success of the current plan and the need for corrective actions. This element includes assessing flight-environmental factors, FARs and other pertinent regulations and procedures, and the available resources that may influence the current state or obtaining a desired state.
Determining actions: This is the subfunction of determining modified guidance or planning actions needed to reach the desired state from the current state.
Modifying: This is the “respond” element, which includes adjusting, changing, or creating a subplan (or subplans) to accommodate the assessed situation. This is the application of the actions from the “determining actions” element.
To provide a concrete example of how such a computational model can be applied to an airborne strategic flight planning concept, we depict the model with definition of processes tailored to real time flight replanning, regardless of where they are performed (Figure 18).
Determining aircraft goals and subgoals (e.g., arrive safely at a specified approach fix at a specified time with a specified amount of fuel remaining; avoid time/position x,y,z,t enroute). In replanning, this task includes identifying goal changes “on the fly.” Default goal is current flight plan. Subgoals are the same as constraints 中国航空网 www.aero.cn 航空翻译 www.aviation.cn 本文链接地址：Airborne-Based Conflict Probe(45)
