Exploratory Statistical Analysis of Planet Approach Phase Guidance Schemes Using Range, Range-rate, and Angular-rate Measurements PDF Download
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Author: David P. Harry
Publisher:
ISBN:
Category : Numerical analysis
Languages : en
Pages : 86
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Author: David P. Harry
Publisher:
ISBN:
Category : Numerical analysis
Languages : en
Pages : 86
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Author: Alan L. Friedlander
Publisher:
ISBN:
Category : Astrodynamics
Languages : en
Pages : 70
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Book Description
The problem of determining how many corrections to make and when to make them is a consequence of the conflicting requirement of accurate trajectory determination and propulsion. Optimum values were found for a vehicle approaching a planet along a parabolic trajectory with an initial perigee distance of 5 radii and a target perigee of 1.02 radii. In this example measurement errors were less than i minute of arc. Results indicate that four corrections applied in the vicinity of 50, 16, 15, and 1.5 radii, respectively, yield minimum velocity-increment requirements. Thrust devices capable of producing a large variation of velocity-increment size are required. For a vehicle approaching the earth, miss distances within 32 miles are obtained with 90-percent probability. Total velocity increments used in guidance are less than 3300 feet per second with 90-percent probability.
Author: David P. Harry
Publisher:
ISBN:
Category : Space vehicles
Languages : en
Pages : 80
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Author:
Publisher:
ISBN:
Category : Aerodynamics
Languages : en
Pages : 84
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Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 358
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Author: Alan L. Friedlander
Publisher:
ISBN:
Category : Database management
Languages : en
Pages : 40
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Book Description
A statistical analysis and evaluation of the effect of data-adjustment and decision techniques on the efficiency of midcourse guidance maneuvers are presented. A potentially self-contained optical navigation scheme is hypothesized, and all random measurement errors are considered specified by Gaussian distributions. The basic guidance equations are developed using linear perturbations methods. The nature of data-adjustment procedure is that the accuracy of terminal prediction improves successively from one guidance point to the next. Guidance logic, based on dead-band and damping decision expressions, further reduces the velocity-increment cost and number of corrections required.
Author: Alan L. Friedlander
Publisher:
ISBN:
Category :
Languages : en
Pages : 76
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Author:
Publisher:
ISBN:
Category : Mechanics, Applied
Languages : en
Pages : 1096
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Author: United States. National Aeronautics and Space Administration
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Author:
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 494
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