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 : 90
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Book Description
Author: David P. Harry
Publisher:
ISBN:
Category : Numerical analysis
Languages : en
Pages : 90
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Book Description
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 : Numerical analysis
Languages : en
Pages : 86
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Book Description
Author: Alan L. Friedlander
Publisher:
ISBN:
Category :
Languages : en
Pages : 76
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Book Description
Author: Alan L. Friedlander
Publisher:
ISBN:
Category : Astrodynamics
Languages : en
Pages : 0
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Book Description
An exploratory analysis of vehicle guidance during the approach to a target planet is presented. The objective of the guidance maneuver is to guide the vehicle to a specific perigee distance with a high degree of accuracy and minimum corrective velocity expenditure. The guidance maneuver is simulated by considering the random sampling of real measurements with significant error and reducing this information to prescribe appropriate corrective action. The instrumentation system assumed includes optical and/or infrared devices to indicate range and a reference angle in the trajectory plane. Statistical results are obtained by Monte-Carlo techniques and are shown as the expectation of guidance accuracy and velocity-increment requirements. Results are nondimensional and applicable to any planet within limits of two-body assumptions. 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. It is noted that the above representative results are valid only for the particular guidance scheme hypothesized in this analysis. A parametric study is presented which indicates the effects of measurement error size, initial perigee, and initial energy on the guidance requirements. Measurement error size significantly affects both guidance accuracy and velocity-increment expenditure. The initial trajectory, as given by its perigee and energy, affects the velocity-increment expenditure but not final guidance accuracy.
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:
Publisher:
ISBN:
Category : Mechanics, Applied
Languages : en
Pages : 1096
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Book Description
