source: ntrip/trunk/BNC/RTIGS/rtigs_records.h@ 174

Last change on this file since 174 was 52, checked in by mervart, 18 years ago

* empty log message *
File size: 10.8 KB
Line 
1/***************************************************************************
2 rtigs_records.h - description
3 -------------------
4 begin : Wed Aug 27 2003
5 copyright : (C) 2003 by Ken MacLeod
6 email : ken.macleod@nrcan.gc.ca.
7 ***************************************************************************/
8
9/***************************************************************************
10 *
11 * This program is free software; you can redistribute it and/or modify
12 * it under the terms of the GNU General Public License as published by
13 * the Free Software Foundation; either version 2 of the License, or
14 * (at your option) any later version.
15 *
16 ***************************************************************************/
17#ifndef _RTIGS_T
18#define _RTIGS_T
19
20/*****************************************************************************
21* RT-IGS record structures
22*
23* General:
24*
25* Every record will have a defined number. We propose the following:
26* 1) Station record number 100;
27* 2) Observation record number 200;
28* 3) Ephemeris record number 300;
29* 4) Meteorological record number 400;
30*
31* Every station will have a unique number. We propose the following:
32*
33* 1-99 reserved for JPL
34* 100-199 reserved for NRCan
35* 200-299 reserved for NGS
36* 300-399 reserved for ESOC
37* 400-499 reserved for GFZ
38* 500-599 reserved for BKG
39* 600-699 reserved for GEOSCIENCE AUS.
40* 700-799 others
41* etc
42* The number of bytes in each real time message will include the header as
43* well as the data content, but NOT the pointer. For example :
44*
45* 1) A station message is output once per hour and is 20 bytes
46*
47* 2) An observation message is output once per second. The header is
48* 12 bytes long and the SOC data is 21 bytes per PRN. So a typical
49* RTIGSO_T message will be 390 bytes if 8 sats are being tracked
50*
51* 3) An ephemeris message is output when the ephemeris is decoded by the
52* GPS receiver. The time in the Ephemeris header is the collected time.
53* One ephemeris can be bundled in a RTIGSE_T.
54* A RTIGSE_T message contains one eph. the message consists of 12 header
55* bytes and 72 ephemeris bytes, for a total of 84 bytes.
56*
57* 4) The RTIGSM_T (met) message should be issues once every 15 minutes.
58* A basic met message consists of a 12 byte header and 3 longs (temp,
59* press and relative humidity) for a total of 24 bytes.
60*
61* All records will be related to a station configuration indicated by the
62* Issue of Data Station(IODS). The IODS will enable the user to identify
63* the equipment and software that was used to derive the observation data.
64*
65* Each record header will contain the GPS Time in seconds which is
66* continuous from ((6 Jan-1980)).
67*
68* The data payload of each record will consist of observations. The
69* structures shown below indicate a pointer to data but in fact the broadcast
70* messages will not contain the pointed only the data. Users will have to
71* manage the data and the pointer is shown to illustrate where the data is
72* located in the message and one possible data management option.
73*
74*
75* All record data in network byte order (Big Endian), ie IA32 users will
76* have to swap bytes ;-)
77******************************************************************************
78* Developed by Ken MacLeod Aug. 27/2003
79* Updated and revised Feb. 10/2004 with comments from R. Muellershoen
80*****************************************************************************/
81
82#define MAXSTA 256
83#define MAXSOC 264 /* 12 + (12 * 21) = 264*/
84#define MAXEPH 876 /* 12 + (12 * 72) = 876*/
85#define MAXMETS 6
86
87
88/*****************************************************************************
89* Structure name : RTIGSS_T
90*
91* Purpose:
92*
93* Encapsulate the station information that is required for real-time users
94*
95* Users should use this record is to link data to a specific station
96* configuration.
97* The station message should be transmitted by station operator every
98* hour and upon update.
99* If the stations record Issue of Data Station(IODS) and the IODS in the
100* observation record do not match then the data should be used without
101* further investigation
102*
103*
104*
105* This record is not intended to replace the IGS Station log but it is
106* seen as a subset of the IGS log and contains information that enables
107* real-time users to monitor station changes.
108*
109*
110*Version: 1.0
111*
112*By Ken MacLeod Aug. 27/2003
113*Changes: Revised Feb. 10/2004 updated the message description info.
114 ****************************************************************************/
115
116typedef struct rtigs_station
117{
118 unsigned short rec_id; /*100 indicates station record this message */
119 /* to be issued once per hour*/
120 unsigned short sta_id; /*unique number assigned to each station. */
121 /* Uniquely linked to an IGS Station log by */
122 /* the station record*/
123 unsigned long GPSTime; /* time of issue, GPS time is seconds from */
124 /* the beginning of GPS (6 Jan-1980)*/
125 unsigned short num_bytes; /* total number of bytes in the message, */
126 /* including the header*/
127 unsigned char IODS; /* a flag indicating the current station */
128 /* configuration this will change every time */
129 /* the station hardware changes*/
130 unsigned char sta_rec_type; /* could be various station data formats: */
131 /* 0 indicates that there is no additional */
132 /* station data*/
133 char IGS_UniqueID[8]; /* IGS ID eg NRC1 will use IGS 4 character */
134 /* standard but c requires a \0 to terminate */
135 /* the string */
136 unsigned char *data; /* default station headers Does Not */
137 /* contain data. The current message does */
138 /* not contain additional station */
139 /* information the pointer is shown only */
140 /* to illustrate options*/
141}RTIGSS_T;
142
143/******************************************************************************
144 * Structure name : RTIGSO_T
145 *
146 * Purpose : GPS Observations
147 * Currently the JPL Soc format is used to compress the
148 * observation data.
149 * See JPL's website for a description of the SOC
150 * compression routine
151 *Version: 1.0
152 *
153 *By Ken MacLeod Aug. 27/2003
154 *Changes: Revised Feb. 10/2004 Remove station clock and obs time
155 * in milliseconds and add to the message description
156 *****************************************************************************/
157typedef struct rtigs_obs
158{
159 unsigned short rec_id; /* 200 indicates rt-igs gps observation*/
160 unsigned short sta_id; /* Unique num. assigned to each station */
161 /* Uniquely linked to an IGS Station log y */
162 /* the station record*/
163 unsigned long GPSTime; /* observation time of issue, GPS time is */
164 /* seconds from the beginning of GPS */
165 /* (6 Jan-1980)*/
166 unsigned short num_bytes; /* total number of bytes in the message, */
167 /* including the header, but not the data */
168 /* pointer*/
169 unsigned char IODS; /* a flag indicating the current station */
170 /* configuration that derived the */
171 /* observations this value will change */
172 /* every time the station configuration */
173 /* changes*/
174 unsigned char num_obs; /* number of GPS Observations in data block*/
175 unsigned char *data; /* pointer to soc observation data (4 byte pointer), this pointer */
176 /* is not in the message the data starts */
177 /* here, the pointer is used to manage the */
178 /* SOC data once the RTIGS0_T message has */
179 /* been decoded */
180} RTIGSO_T;
181/*****************************************************************************
182 * Structure name : RTIGSE_T
183 *
184 * Purpose : SV Ephemeris in Broadcast format parity removed
185 *
186 *Version: 1.0
187 *
188 *By Ken MacLeod Aug. 27/2003
189 *Changes: Revised Feb. 10/2004
190 *****************************************************************************/
191typedef struct rtigs_ephemeris
192{
193 unsigned short rec_id; /* 300 indicates rt-igs eph*/
194 unsigned short sta_id; /* unique number assigned */
195 /* to each station*/
196 unsigned long CollectedGPSTime; /* time ephemeris received at */
197 /*station, GPS time is seconds */
198 /* from the beginning of GPS */
199 /* (6 Jan-1980)*/
200 unsigned short num_bytes; /* total number of bytes in the message, */
201 /* including the header, but not the size */
202 /* of the data pointer*/
203 unsigned char IODS; /* a flag indicating the current station */
204 /* configuration that derived the */
205 /* observations this will change every */
206 /* time the sta config changes*/
207 unsigned char prn; /* PRN*/
208 unsigned char *data; /* In the RTIGSE_T message the data */
209 /* starts here, the pointer is used to */
210 /* manage the eph data once the RTIGSE_T */
211 /* message has been decoded */
212 /* The RTIGSE_T eph. format consists of */
213 /* the 3 broadcast sub frames with the */
214 /* parity bits removed so 3 */
215 /* subframes = 72 bytes */
216} RTIGSE_T;
217
218/***********************************************************************
219 * Structure name : RTIGSM_T
220 *
221 * Purpose : Station Meteorological observations
222 *
223 *Version: 1.0
224 *
225 *By Ken MacLeod Aug. 27/2003
226 *Changes: Changed the met array to an long pointer
227 ***********************************************************************/
228typedef struct rtigs_mets
229{
230 unsigned short rec_id; /* 400 indicates rt-igs met*/
231 unsigned short sta_id; /* unique number assigned to each */
232 /* station*/
233 unsigned long GPSTime; /* time of issue, GPS time is seconds */
234 /* from the beginning of GPS (6 Jan-1980)*/
235 unsigned short num_bytes; /* total number of bytes in the message,*/
236 /* including the header but not the pointer*/
237 unsigned char IODS; /* a flag indicating the current station */
238 /* config that derived the observations */
239 /* this will change every time the station */
240 /* configuration changes*/
241 unsigned char numobs; /* if only temp, press, rel hum then : 3 */
242 long *mets; /* temp(Deg C), press (mb), */
243 /* rel humid(%), zenith Wet(metres), */
244 /* Zenith Dry(metres), Zenith Total */
245 /* (metres) and each scaled by 1000 so */
246 /* 1000.123 mb = 1000123*/
247 /*if the zenith observations are not */
248 /* present only enter 3 for the num of obs.*/
249} RTIGSM_T;
250
251#endif
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