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