Feasibility study of a bang-bang path control for a reentry vehicle
Feasibility study of bang-bang path control for reentry vehicles
REENTRY VEHICLE↗
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Results for “path”
Search indexed NASA NTRS and DOE OSTI research on propulsion, heat transfer, battery materials and energy systems. Follow report and document links to the original sources.
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Approximate Solutions for Flight-Path Angle of a Reentry Vehicle in the Upper Atmosphere
Approximate solutions for flight path angle of reentry vehicle in upper atmosphere
UPPER ATMOSPHERE↗
Measurements of gas density by determining the path length of lithium ions
Gas density measurements by lithium ion path length determinations
PATH↗
Ranger VII Flight Path and Its Determination from Tracking Data
Flight path and tracking study of Ranger VII LUNAR probe
RANGER VII LUNAR PROBE↗
Study-fluid flight path control system final report
Control system for lateral and pitch flight path stabilization of light aircraft - analog simulation of Cessna 310 aircraft
AIRCRAFT CONTROL↗
The Ranger III flight path and its determina- tion from data
Ranger III flight path and its determination from tracking data
TRACKING↗
The absorption of laser radiation along atmospheric slant paths.
Laser radiation absorbed along slant paths, spectral line overlapping and center line shift with pressure variation
LASER OUTPUT↗
The distribution of photon optical paths in a scattering atmosphere.
Absorption lines and bands in scattering and absorbing medium elucidated by study of distribution of photon optical paths in scattering atmosphere
ATMOSPHERIC SCATTERING↗
Study of dynamic longitudinal stability of aircraft in constant glide path angle
Dynamic longitudinal stability of aircraft in constant glide path angle
SPEED REGULATION↗
The separate computation of arcs for optimal flight paths with state variable inequality constraints
Computation of arcs for optimal flight paths with state variable inequality constraints
OPTIMIZATION↗
A neighboring optimum feedback control scheme based on estimated time-to-go with application to re-entry flight paths
Neighboring optimum feedback control system for reentry flight paths
FLIGHT PATH↗
Study of fluid flight path control system
Flight path stabilization of light aircraft using fluid control system
CONTROL SYSTEM↗
A new method for calculating the propagation reliability of 2 GHz microwave signals over optical paths.
Geographical location and optical path length effects upon fade margin required for desired propagation reliability of microwave signals
GEOGRAPHY↗
A terrain-based path planning method for mobile robots
This paper presents a technique for incorporating terrain traversability data into a global path planning method for field mobile robots operating on rough natural terrain.
path planning traversability terrain assessment↗
Autonomous path-planning for formation flying-applications
The paper presents a solution to the optimal formation path-planning problem where the formation reconfigurations are required subject to collision avoidance and resource limitation contraints.
formation flying collision-avoidance path-planning↗
T*: a novel terrain-based path planning method for mobile robots
This paper presents a novel global path planning method for field mobile robots operating on rough natural terrain.
path planning robotics terrain analysis↗
An Autonomous Path Planner Implemented on the Rocky7 Prototype Microrover
Much prior work in mobile robot path planning has been based on assumptions that are not really applicable for exploration of planetary terrains.
planetary terrains Rocky7 Prototype Microrover Aut↗
CloudSat-Constrained Cloud Ice Water Path and Cloud Top Height Retrievals from MHS 157 and 183.3 GHz Radiances
Ice water path (IWP) and cloud top height (ht) are two of the key variables in determining cloud radiative and thermodynamical properties in climate models. Large uncertainty remains among IWP measurements from satellite sensors, in large part due to the assumptions made for cloud microphysics in these retrievals. In this study, we develop a fast algorithm to retrieve IWP from the 157, 183.3+/-3 and 190.3 GHz radiances of the Microwave Humidity Sounder (MHS) such that the MHS cloud ice retrieval is consistent with CloudSat IWP measurements. This retrieval is obtained by constraining the empirical forward models between collocated and coincident measurements of CloudSat IWP and MHS cloud-induced radiance depression (Tcir) at these channels. The empirical forward model is represented by a lookup table (LUT) of Tcir-IWP relationships as a function of ht and the frequency channel.With ht simultaneously retrieved, the IWP is found to be more accurate. The useful range of the MHS IWP retrieval is between 0.5 and 10 kg/sq m, and agrees well with CloudSat in terms of the normalized probability density function (PDF). Compared to the empirical model, current operational radiative transfer models (RTMs) still have significant uncertainties in characterizing the observed Tcir-IWP relationships. Therefore, the empirical LUT method developed here remains an effective approach to retrieving ice cloud properties from the MHS-like microwave channels.
cloud top height↗