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JNISpice version 2.0.0 |
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java.lang.Objectspice.basic.GF
spice.basic.GFNumericSearch
spice.basic.GFPhaseAngleSearch
public class GFPhaseAngleSearch
Class GFPhaseSearch specifies a search for phase angle events.
THIS SOFTWARE AND ANY RELATED MATERIALS WERE CREATED BY THE CALIFORNIA INSTITUTE OF TECHNOLOGY (CALTECH) UNDER A U.S. GOVERNMENT CONTRACT WITH THE NATIONAL AERONAUTICS AND SPACE ADMINISTRATION (NASA). THE SOFTWARE IS TECHNOLOGY AND SOFTWARE PUBLICLY AVAILABLE UNDER U.S. EXPORT LAWS AND IS PROVIDED "AS-IS" TO THE RECIPIENT WITHOUT WARRANTY OF ANY KIND, INCLUDING ANY WARRANTIES OF PERFORMANCE OR MERCHANTABILITY OR FITNESS FOR A PARTICULAR USE OR PURPOSE (AS SET FORTH IN UNITED STATES UCC SECTIONS 2312-2313) OR FOR ANY PURPOSE WHATSOEVER, FOR THE SOFTWARE AND RELATED MATERIALS, HOWEVER USED. IN NO EVENT SHALL CALTECH, ITS JET PROPULSION LABORATORY, OR NASA BE LIABLE FOR ANY DAMAGES AND/OR COSTS, INCLUDING, BUT NOT LIMITED TO, INCIDENTAL OR CONSEQUENTIAL DAMAGES OF ANY KIND, INCLUDING ECONOMIC DAMAGE OR INJURY TO PROPERTY AND LOST PROFITS, REGARDLESS OF WHETHER CALTECH, JPL, OR NASA BE ADVISED, HAVE REASON TO KNOW, OR, IN FACT, SHALL KNOW OF THE POSSIBILITY. RECIPIENT BEARS ALL RISK RELATING TO QUALITY AND PERFORMANCE OF THE SOFTWARE AND ANY RELATED MATERIALS, AND AGREES TO INDEMNIFY CALTECH AND NASA FOR ALL THIRD-PARTY CLAIMS RESULTING FROM THE ACTIONS OF RECIPIENT IN THE USE OF THE SOFTWARE.
GF NAIF_IDS SPK TIME WINDOWS
EVENT GEOMETRY EPHEMERIS SEARCH WINDOW
The numerical results shown for these examples may differ across platforms. The results depend on the SPICE kernels used as input, the compiler and supporting libraries, and the machine specific arithmetic implementation. Use the meta-kernel shown below to load the required SPICE kernels. KPL/MK File name: standard.tm This meta-kernel is intended to support operation of SPICE example programs. The kernels shown here should not be assumed to contain adequate or correct versions of data required by SPICE-based user applications. In order for an application to use this meta-kernel, the kernels referenced here must be present in the user's current working directory. The names and contents of the kernels referenced by this meta-kernel are as follows: File name Contents --------- -------- de421.bsp Planetary ephemeris pck00009.tpc Planet orientation and radii naif0009.tls Leapseconds \begindata KERNELS_TO_LOAD = ( 'de421.bsp', 'pck00009.tpc', 'naif0009.tls' ) \begintext
Example:
Determine the time windows from December 1, 2006 UTC to January 31, 2007 UTC for which the sun-moon-earth configuration phase angle satisfies the relation conditions with respect to a reference value of .57598845 radians (the phase angle at January 1, 2007 00:00:00.000 UTC, 33.001707 degrees). Also determine the time windows corresponding to the local maximum and minimum phase angles, and the absolute maximum and minimum phase angles during the search interval. The configuration defines the sun as the illuminator, the moon as the target, and the earth as the observer. import spice.basic.*; import static spice.basic.GFConstraint.*; import static spice.basic.TimeConstants.*; class GFPhaseSearch_t { static String[] relation = { "LOCMIN", "ABSMIN", "LOCMAX", "ABSMAX" }; // // Load the JNISpice shared library. // static { System.loadLibrary( "JNISpice" ); } public static void main ( String[] args ) { try { final int MAXWIN = 1000; final String TIMFMT = "YYYY-MON-DD HR:MN:SC.###"; // // Declare the needed windows. The confinement window // must be non-null, since we'll later call the "insert" // method to add values to it. The result window will // be assigned a value by the `run' method. // SpiceWindow confin = new SpiceWindow(); SpiceWindow result = null; AberrationCorrection abcorr = new AberrationCorrection( "LT+S" ); Body target = new Body ( "MOON" ); Body illum = new Body ( "SUN" ); Body obsrvr = new Body ( "EARTH" ); // // Load kernels. // KernelDatabase.load ( "/kernels/standard.tm" ); // // Store the time bounds of our search interval in // the confinement window. // double begtim = ( new TDBTime ( "2006 DEC 01" ) ).getTDBSeconds(); double endtim = ( new TDBTime ( "2007 JAN 31" ) ).getTDBSeconds(); confin.insert( begtim, endtim ); GFPhaseSearch search = new GFPhaseSearch( target, illum, abcorr, obsrvr ); // // Search using a step size of 1 day (in units of seconds). // double step = SPD; for ( int k = 0; k < relation.length; k++ ) { GFConstraint relate = GFConstraint.createExtremumConstraint( relation[k] ); // // Run the search over the confinement window, // using the selected constraint and step size. // Indicate the maximum number of workspace // intervals to use. // result = search.run ( confin, relate, step, MAXWIN ); // // Display the results. // int count = result.card(); if ( count == 0 ) { System.out.format ( "Result window is empty.%n%n" ); } else { double[] interval = new double[2]; TDBTime start; TDBTime stop; System.out.format ( "Relation = %s%n", relation[k] ); for ( int i = 0; i < count; i++ ) { // // Fetch the endpoints of the Ith interval of the result // window. // interval = result.getInterval( i ); // // Check the distance at the interval's // start and stop times. // start = new TDBTime( interval[0] ); stop = new TDBTime( interval[1] ); System.out.format ( "Start time = %s %n", start.toString(TIMFMT) ); System.out.format ( "Stop time = %s %n", stop.toString(TIMFMT) ); } System.out.format ( "%n" ); } } } catch ( SpiceException exc ) { exc.printStackTrace(); } } }The program outputs:
Relation = LOCMIN Start time = 2006-DEC-05 00:16:50.317 Stop time = 2006-DEC-05 00:16:50.317 Start time = 2007-JAN-03 14:18:31.977 Stop time = 2007-JAN-03 14:18:31.977 Relation = ABSMIN Start time = 2007-JAN-03 14:18:31.977 Stop time = 2007-JAN-03 14:18:31.977 Relation = LOCMAX Start time = 2006-DEC-20 14:09:10.392 Stop time = 2006-DEC-20 14:09:10.392 Start time = 2007-JAN-19 04:27:54.600 Stop time = 2007-JAN-19 04:27:54.600 Relation = ABSMAX Start time = 2007-JAN-19 04:27:54.600 Stop time = 2007-JAN-19 04:27:54.600
Version 1.0.0 08-MAR-2014 (NJB)(EDW)
Field Summary |
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Fields inherited from class spice.basic.GF |
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ADDWIN, ANNULR, ANY, CIRFOV, CNVTOL, EDSHAP, ELLFOV, FULL, MARGIN, MAXVRT, PARTL, POLFOV, PTSHAP, RECFOV, RYSHAP, SPSHAP |
Constructor Summary | |
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GFPhaseAngleSearch(Body target,
Body illum,
AberrationCorrection abcorr,
Body observer)
Constructor description. |
Method Summary | |
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SpiceWindow |
run(SpiceWindow confinementWindow,
GFConstraint constraint,
double step,
int maxWorkspaceIntervals)
Run a phase angle search over a specified confinement window, using a specified constraint and step size (units are TDB seconds). |
SpiceWindow |
run(SpiceWindow confinementWindow,
GFConstraint constraint,
double step,
int maxWorkspaceIntervals,
double tol)
Run a phase angle search over a specified confinement window, using a specified constraint, step size, and convergence tolerance. |
Methods inherited from class spice.basic.GF |
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setTolerance |
Methods inherited from class java.lang.Object |
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clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
Constructor Detail |
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public GFPhaseAngleSearch(Body target, Body illum, AberrationCorrection abcorr, Body observer)
Constructor description.
GFPhaseSearch Example
Method Detail |
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public SpiceWindow run(SpiceWindow confinementWindow, GFConstraint constraint, double step, int maxWorkspaceIntervals) throws SpiceException
Run a phase angle search over a specified confinement window, using a specified constraint and step size (units are TDB seconds).
For important details concerning this module's function, please refer to the CSPICE routine gfpa_c.
None.
run
in class GFNumericSearch
SpiceException
public SpiceWindow run(SpiceWindow confinementWindow, GFConstraint constraint, double step, int maxWorkspaceIntervals, double tol) throws SpiceException
Run a phase angle search over a specified confinement window, using a specified constraint, step size, and convergence tolerance.
For important details concerning this module's function, please refer to the CSPICE routine gfpa_c and gfstol_c.
None.
SpiceException
GFPhaseSearch Example
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JNISpice version 2.0.0 |
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