Highway-In-The-Sky (HITS) trajectories and symbology were generated for GPS WAAS approach procedures developed for the NASA Small Aircraft Transportation System (SATS) demonstration flights. Aircraft position and attitude data collected using an integrated IMU/GPS were used to render synthetic ground imagery and Highway-In-The-Sky (HITS) symbology using the X-Plane program in real-time. Flight testing showed that synthetic imagery using actual aircraft data can be used for aircraft guidance and for situational awareness, as well as for post flight playback and analysis. The availability of high quality scenery and elevation data as well as the existence of a software development kit allowed use of the X-Plane flight simulation program as a high performance and inexpensive rendering platform. This proved the feasibility of building an inexpensive synthetic vision system to generate synthetic imagery on a low cost head up display (HUD) designed for general aviation type aircraft.
This paper describes architectures based on a new memory structure. Memory systems which can perform multiple transfers are described and issues in processor architecture are considered. A general model for memory operations is given, and the classical single transfer memory structures are described. Based on the generalized model, new structures which allow multiple transfers to be performed as a single processor operation are developed. Some architectural considerations at the processor level to support these kinds of memory systems are then discussed. The advantages and disadvantages of these new structures as compared to conventional memories are also discussed and a preliminary performance evaluation is done. This discussion generally refers to the random access, physical, main memory in the system, although many of the results are applicable to other storage devices.
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