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| 2 | /***************************************************************************
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| 3 | gpswro.h - description
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| 4 | -------------------
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| 5 | begin : Tue Mar 7 2000
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| 6 | copyright : (C) 2000 by Ken MacLeod
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| 7 | email : macleod@geod.nrcan.gc.ca
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| 8 | ***************************************************************************/
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| 9 |
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| 10 | /***************************************************************************
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| 11 | * *
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| 12 | * This program is free software; you can redistribute it and/or modify *
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| 13 | * it under the terms of the GNU General Public License as published by *
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| 14 | * the Free Software Foundation; either version 2 of the License, or *
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| 15 | * (at your option) any later version. *
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| 16 | * *
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| 17 | ***************************************************************************/
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| 18 | /*-------------------------------------------------------------------------*/
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| 19 | /* Name : gpswro.h */
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| 20 |
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| 21 | /* Purpose : definitions for GPS week rollover functions. */
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| 22 |
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| 23 | /* The sliding window technique is implemented to unroll week */
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| 24 | /* and seconds since week 0. It is implemented with */
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| 25 | /* ROLL_NUMBER, GPSWK_LIMIT and GPSEC_LIMIT. */
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| 26 |
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| 27 | /* ROLL_NUMBER defines the sequence number of week rollover */
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| 28 | /* i.e. ROLL_NUMBER 1 is week 1024, ROLL_NUMBER 2 is 2048, */
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| 29 | /* etc. The GPSWK_LIMIT is such that unrolling will give: */
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| 30 |
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| 31 | /* week%1024 + ROLL_NUMBER * 1024 for week%1024 < GPSWK_LIMIT */
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| 32 | /* week%1024 + (ROLL_NUMBER-1) * 1024 for week%1024 >= GPSWK_LIMIT */
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| 33 |
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| 34 | /* Example: with ROLL_NUMBER=2 and GPSWK_LIMIT=970, the */
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| 35 | /* following will occur: */
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| 36 |
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| 37 | /* Input Unroll Roll */
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| 38 | /* 970+n*1024 1994 970 */
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| 39 | /* 1023+n*1024 2047 1023 */
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| 40 | /* 0+n*1024 2048 0 */
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| 41 | /* 969+n*1024 3017 969 */
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| 42 |
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| 43 | /* This means the only possible output of unrolled weeks lie */
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| 44 | /* in the [1994,3017] interval spanning 1023 weeks, whatever */
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| 45 | /* the input. This interval is defined by ROLL_NUMBER and */
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| 46 | /* GPSWK_LIMIT. */
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| 47 |
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| 48 | /* The (un)rolling of GPS seconds since week 0 is done in the */
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| 49 | /* same manner and uses the same limit. */
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| 50 |
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| 51 | /* RCS: $Header: gpswro.h,v 3.1 99/06/08 15:59:41 lahaye Released $ */
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| 52 |
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| 53 | /* Externals : */
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| 54 | /*-------------------------------------------------------------------------*/
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| 55 |
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| 56 | #ifndef _GPSWRO_H
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| 57 |
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| 58 | #define _GPSWRO_H
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| 59 |
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| 60 | #define ROLL_NUMBER (1) /* User definition */
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| 61 | #define GPSWK_LIMIT (970) /* User definition */
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| 62 |
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| 63 | #define ROLL_WK (1024)
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| 64 | #define GPSWK_ROLL(W) (W-(int)W+(int)W%ROLL_WK)
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| 65 | #define GPSWK_UNROLL(W) (W-(int)W+(int)W%ROLL_WK+(ROLL_NUMBER-((int)W%ROLL_WK>=GPSWK_LIMIT))*ROLL_WK)
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| 66 |
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| 67 | #define GPSEC_LIMIT (604800*GPSWK_LIMIT)
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| 68 | #define ROLL_SEC (604800*ROLL_WK)
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| 69 | #define GPSEC_ROLL(S) (S-(int)S+(int)S%ROLL_SEC)
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| 70 | #define GPSEC_UNROLL(S) (S-(int)S+(int)S%ROLL_SEC+(ROLL_NUMBER-((int)S%ROLL_SEC>=GPSEC_LIMIT))*ROLL_SEC)
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| 71 |
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| 72 | #endif
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