摘要 :
Phase 1 called for the following tasks: (1) completion of code to generate intermediate files containing the individual DIRBE observations which would be used to make the superpixelized maps; (2) completion of code necessary to ge...
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Phase 1 called for the following tasks: (1) completion of code to generate intermediate files containing the individual DIRBE observations which would be used to make the superpixelized maps; (2) completion of code necessary to generate the maps themselves; and (3) quality control on test-case maps in the form of point-source extraction and photometry. Items 1 and 2 are well in hand and the tested code is nearly complete. A few test maps have been generated for the tests mentioned in item 3. Map generation is not in production mode yet.
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摘要 :
Phase 1 called for the following tasks: (1) completion of code to generate intermediate files containing the individual DIRBE observations which would be used to make the superpixelized maps; (2) completion of code necessary to ge...
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Phase 1 called for the following tasks: (1) completion of code to generate intermediate files containing the individual DIRBE observations which would be used to make the superpixelized maps; (2) completion of code necessary to generate the maps themselves; and (3) quality control on test-case maps in the form of point-source extraction and photometry. Items 1 and 2 are well in hand and the tested code is nearly complete. A few test maps have been generated for the tests mentioned in item 3. Map generation is not in production mode yet.
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摘要 :
This report investigates image correlation for map matching in target acquisition and tracking both theoretically and by using computer simulations. The emphasis is on the acquisition phase, particularly (1) the probability of ach...
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This report investigates image correlation for map matching in target acquisition and tracking both theoretically and by using computer simulations. The emphasis is on the acquisition phase, particularly (1) the probability of achieving a correct match, (2) selection of an appropriate comparison metric to maximize this probability. Study conclusions: Using methods outlined in this report, an approximate lower bound on the value of the probability of a corrct match can be calculated. Several quantitative relationships between this probability and various system parameters have been derived and largely confirmed by simulation testing. The second conclusion is that there ought to be better algorithms than those used in the past. It is reasonable and consistent with theory to search for more efficient ways to carry out the initial map-matching or target-acquisition function. Preprocessing to extract special features using techniques of pattern recognition appear promising for the generation of more efficient algorithms. Future research in this area is outlined. (Author)
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Area correlation techniques are applied to the long-range remotely piloted vehicle (RPV) attack mission in both mid-course and terminal guidance phases. The mid-course guidance consists of a set of navigation fixes at waypoints al...
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Area correlation techniques are applied to the long-range remotely piloted vehicle (RPV) attack mission in both mid-course and terminal guidance phases. The mid-course guidance consists of a set of navigation fixes at waypoints along a preprogrammed route. The terminal guidance for weapon delivery incorporates a technique of compensation for magnification during range closure via a zoom lens. This report also presents simulations of both phases of guidance, using the sequential similarity detection algorithm as the image correlator. (Author)
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This Note briefly describes the matching process. The major emphasis is in describing the elements of the matching process--the scene, matching algorithms, and errors--and determining their roles in and effect on the matching proc...
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This Note briefly describes the matching process. The major emphasis is in describing the elements of the matching process--the scene, matching algorithms, and errors--and determining their roles in and effect on the matching process. A means is provided for structuring the map matching problem. Thescene is defined by the degree of homogeneity and the number of independent elements in each homogeneous region. The errors are further broken up into categories which are mutually exclusive, comprehensive, and positively related to a preprocessing technique or algorithm required to accommodate them. The errors are thus broken up into one of the following categories: global, regional, local, and nonstructured. Finally, the matching algorithms are defined as being of a feature matching correlation or hybrid type. The latter type is a new glass of algorithm developed at Rand which bridges the gap between feature matching and correlation types of algorithms. (Author)
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The Stellar Inertial Design Guide was completed to provide weapon system planners with design and trade off data on the application of stellar inertial guidance techniques to ballistic weapons. Data are presented on hardware, soft...
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The Stellar Inertial Design Guide was completed to provide weapon system planners with design and trade off data on the application of stellar inertial guidance techniques to ballistic weapons. Data are presented on hardware, software, and operational aspects of the stellar inertial system, the highlights of which are: (1) A summary of stellar inertial advantages and impact of stellar-aided guidance system on other subsystems, and on weapon system operation; a discussion of the impact of stellar inertial techniques on MIRV accuracy; (2) A detailed accuracy study of various deployment modes at ranges of 1000, 5500, and 7000 NM; based primarily on UNISTAR implementation, data are presented on the effects of time of sight, star position, trajectory shaping, initial condition variations and inertial component errors on the on target error; also included is a presentation of the overall weapon system accuracy; (3) A presentation of software analytics necessary to support a stellar inertial guidance system; included are the methods of star selection, generation of correction terms, validation algorithm, determination of target bias and stellar sensor model updating; (4) Hardware implications of stellar inertial guidance system including a study of various SIMU configurations, ADC requirements and loading, and stellar sensor design criteria. (Author)
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This report summarizes the development of map matching techniques for precision guided reentry vehicles using measurements extracted from data taken by sensors with different operating characteristics and under different viewing g...
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This report summarizes the development of map matching techniques for precision guided reentry vehicles using measurements extracted from data taken by sensors with different operating characteristics and under different viewing geometries. The case of matching optical to side looking radar images is considered in detail. Map matching with hierarchical search was developed and practical algorithms implemented in matching scences with a wide variety of contents. Theoretical analyses, which were subsequently verified by experiment, indicated that applications of this method have made the difficult task of optical to radar map matching possible at a computational efficiency of 3 orders in magnitude higher than current map matching methods. Map matching with this method has also resulted in a high probability of a match at a relatively low probability of false fix. Also included are analyses to determine perpective, scaling and rotational parameters from data extracted from image set. Geometric transformation for the correction of viewing geometry can be made using these parameters. Intensity transformation using sensor-dependent parameters was also developed. Practical algorithms were implemented for the corrections of the intensity of several sets of radar images.
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