53 research outputs found
Loran-C digital word generator for use with a KIM-1 microprocessor system
The problem of translating the time of occurrence of received Loran-C pulses into a time, referenced to a particular period of occurrence is addressed and applied to the design of a digital word generator for a Loran-C sensor processor package. The digital information from this word generator is processed in a KIM-1 microprocessor system which is based on the MOS 6502 CPU. This final system will consist of a complete time difference sensor processor for determining position information using Loran-C charts. The system consists of the KIM-1 microprocessor module, a 4K RAM memory board, a user interface, and the Loran-C word generator
Loran-C flight test software
The software package developed for the KIM-1 Micro-System and the Mini-L PLL receiver to simplify taking flight test data is described along with the address and data bus buffers used in the KIM-1 Micro-system. The interface hardware and timing are also presented to describe completely the software programs
Cockpit weather radar display demonstrator and ground-to-air sferics telemetry system
The results of two methods of obtaining timely and accurate severe weather presentations in the cockpit are detailed. The first method described is a course up display of uplinked weather radar data. This involves the construction of a demonstrator that will show the feasibility of producing a course up display in the cockpit of the NASA simulator at Langley. A set of software algorithms was designed that could easily be implemented, along with data tapes generated to provide the cockpit simulation. The second method described involves the uplinking of sferic data from a ground based 3M-Ryan Stormscope. The technique involves transfer of the data on the CRT of the Stormscope to a remote CRT. This sferic uplink and display could also be included in an implementation on the NASA cockpit simulator, allowing evaluation of pilot responses based on real Stormscope data
Enhanced character sizes for the VDM-1 video display board
A display enhancement implemented on the new VDM-1 video display board installed in a LORAN-C navigation receiver is addressed. Increased character size for easier viewing of the 3.75 inch diagonal CRT display is provided
Weather data communication and utilization
The communication of weather data to aircraft is discussed. Problems encountered because of the great quantities of data available and the limited capacity to transfer this via radio link to an aircraft are discussed. Display devices are discussed
Institutions and organizations: The key to sustainable management of resources in river basins
Based on studies of water, poverty and livelihoods in nine river basins, this article reviews the role of institutions and organizations, focusing on their strengths and weaknesses, and to generalize as to why they fail to address the basin-wide issues of water, poverty and livelihoods. The authors show how a more comprehensive, integrated approach might change them to be more broadly relevant to basin-wide needs as well as to address the mismatch between development and the need to provide ecosystem services relevant to food, poverty, livelihoods and sustainable ecosystems. © Copyright 2011 International Water Resources Association
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Habitats and movements of shovelnose sturgeons in the upper Mississippi River
Habitats and movements of shovelnose sturgeons (Scaphirhynchus platorynchus) inPool 13 of the upper Mississippi River were ascertained during April-September 1982 by radiotelemetry,drifted trammel net, and mark-recapture methods. The fish were mostly sedentary, butsometimes they moved up to 11.7 km/d. Most movements occurred in May and July and thefewest in April and June. Long-range movements up to 17 km were noted between activitycenters (areas occupied for 3–93 d). Among 22 radio-tagged shovelnose sturgeons, eightshowed homing behaviour. The fish were frequently located at water depths of 2–7 m, wherecurrents were 20–40 cm/s at the bottom and 40–70 cm/s at the surface. During spring high-riverstages, shovelnose sturgeons were located most frequently downstream from wing dams (rockand brush structures built perpendicular to river flow in the main channel), downstream fromclosing dams (rock and brush structures built across side channels), and at the border of the mainchannel within 50 m of shore. During low-river stages in summer, they were usually close to or inthe main channel or on the upstream side of wing dams and closing dams
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