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source: ntrip/trunk/BNC/src/RTCM3/ephEncoder.cpp@ 9313

Last change on this file since 9313 was 9002, checked in by stuerze, 4 years ago
minor changes
File size: 17.1 KB

Rev	Line
[5852]	1
	2	#include "ephEncoder.h"
[6139]	3
[5852]	4	using namespace std;
	5
	6
	7	// build up RTCM3 for GPS
	8	////////////////////////////////////////////////////////////////////////////
	9	int t_ephEncoder::RTCM3(const t_ephGPS& eph, unsigned char *buffer) {
	10
	11	unsigned char *startbuffer = buffer;
	12	buffer= buffer+3;
	13	int size = 0;
	14	int numbits = 0;
	15	unsigned long long bitbuffer = 0;
[6819]	16	int ura = indexFromAccuracy(eph._ura, eph.type());
[8853]	17	int L5Flag, SFlag, fitIntervalFlag;
[8812]	18
[6814]	19	if (eph.type() == t_eph::QZSS) {
	20	GPSADDBITS(12, 1044)
[8812]	21	GPSADDBITS(4, eph._prn.number())
[6819]	22	GPSADDBITS(16, static_cast<int>(eph._TOC.gpssec())>>4)
[8812]	23	GPSADDBITSFLOAT(8, eph._clock_driftrate, 1.0/static_cast<double>(1<<30)/static_cast<double>(1<<25))
	24	GPSADDBITSFLOAT(16, eph._clock_drift, 1.0/static_cast<double>(1<<30)/static_cast<double>(1<<13))
	25	GPSADDBITSFLOAT(22, eph._clock_bias, 1.0/static_cast<double>(1<<30)/static_cast<double>(1<<1))
[6819]	26	GPSADDBITS(8, eph._IODE)
	27	GPSADDBITSFLOAT(16, eph._Crs, 1.0/static_cast<double>(1<<5))
[8812]	28	GPSADDBITSFLOAT(16, eph._Delta_n, M_PI/static_cast<double>(1<<30)/static_cast<double>(1<<13))
[6819]	29	GPSADDBITSFLOAT(32, eph._M0, M_PI/static_cast<double>(1<<30)/static_cast<double>(1<<1))
	30	GPSADDBITSFLOAT(16, eph._Cuc, 1.0/static_cast<double>(1<<29))
	31	GPSADDBITSFLOAT(32, eph._e, 1.0/static_cast<double>(1<<30)/static_cast<double>(1<<3))
	32	GPSADDBITSFLOAT(16, eph._Cus, 1.0/static_cast<double>(1<<29))
	33	GPSADDBITSFLOAT(32, eph._sqrt_A, 1.0/static_cast<double>(1<<19))
	34	GPSADDBITS(16, static_cast<int>(eph._TOEsec)>>4)
	35	GPSADDBITSFLOAT(16, eph._Cic, 1.0/static_cast<double>(1<<29))
[8812]	36	GPSADDBITSFLOAT(32, eph._OMEGA0, M_PI/static_cast<double>(1<<30)/static_cast<double>(1<<1))
[6819]	37	GPSADDBITSFLOAT(16, eph._Cis, 1.0/static_cast<double>(1<<29))
	38	GPSADDBITSFLOAT(32, eph._i0, M_PI/static_cast<double>(1<<30)/static_cast<double>(1<<1))
	39	GPSADDBITSFLOAT(16, eph._Crc, 1.0/static_cast<double>(1<<5))
[8812]	40	GPSADDBITSFLOAT(32, eph._omega, M_PI/static_cast<double>(1<<30)/static_cast<double>(1<<1))
	41	GPSADDBITSFLOAT(24, eph._OMEGADOT, M_PI/static_cast<double>(1<<30)/static_cast<double>(1<<13))
	42	GPSADDBITSFLOAT(14, eph._IDOT, M_PI/static_cast<double>(1<<30)/static_cast<double>(1<<13))
[6819]	43	GPSADDBITS(2,eph._L2Codes)
	44	GPSADDBITS(10, eph._TOC.gpsw())
	45	GPSADDBITS(4, ura)
	46	GPSADDBITS(6, eph._health)
	47	GPSADDBITSFLOAT(8, eph._TGD, 1.0/static_cast<double>(1<<30)/static_cast<double>(1<<1))
[8853]	48	GPSADDBITS(10, eph._IODC)
[8852]	49	(eph._fitInterval == 2.0) ? fitIntervalFlag = 0 : fitIntervalFlag = 1;
	50	GPSADDBITS(1, fitIntervalFlag)
[6819]	51	GPSADDBITS(3, 0) /* padding */
[8812]	52	} else if (eph.type() == t_eph::IRNSS) {
[9002]	53	GPSADDBITS(12, 1041)
[8812]	54	GPSADDBITS(6, eph._prn.number())
	55	GPSADDBITS(10, eph._TOC.gpsw())
	56	GPSADDBITSFLOAT(22, eph._clock_bias, 1.0/static_cast<double>(1<<30)/static_cast<double>(1<<1))
	57	GPSADDBITSFLOAT(16, eph._clock_drift, 1.0/static_cast<double>(1<<30)/static_cast<double>(1<<13))
	58	GPSADDBITSFLOAT(8, eph._clock_driftrate, 1.0/static_cast<double>(1<<30)/static_cast<double>(1<<25))
	59	GPSADDBITS(4, ura)
	60	GPSADDBITS(16, static_cast<int>(eph._TOC.gpssec())>>4)
	61	GPSADDBITSFLOAT(8, eph._TGD, 1.0/static_cast<double>(1<<30)/static_cast<double>(1<<1))
	62	GPSADDBITSFLOAT(22, eph._Delta_n, M_PI/static_cast<double>(1<<30)/static_cast<double>(1<<11))
	63	GPSADDBITS(8, eph._IODE) // Issue Of Data Ephemeris and Clock
	64	GPSADDBITS(10, 0) /* padding */
	65	if (eph._health == 0.0) {
	66	L5Flag = 0;
	67	SFlag = 0;
	68	} else if (eph._health == 1.0) {
	69	L5Flag = 0;
	70	SFlag = 1;
	71	} else if (eph._health == 2.0) {
	72	L5Flag = 1;
	73	SFlag = 0;
	74	} else if (eph._health == 3.0) {
	75	L5Flag = 1;
	76	SFlag = 1;
	77	}
	78	GPSADDBITS(1, L5Flag)
	79	GPSADDBITS(1, SFlag)
	80	GPSADDBITSFLOAT(15, eph._Cuc, 1.0/static_cast<double>(1<<28))
	81	GPSADDBITSFLOAT(15, eph._Cus, 1.0/static_cast<double>(1<<28))
	82	GPSADDBITSFLOAT(15, eph._Cic, 1.0/static_cast<double>(1<<28))
	83	GPSADDBITSFLOAT(15, eph._Cis, 1.0/static_cast<double>(1<<28))
	84	GPSADDBITSFLOAT(15, eph._Crc, 1.0/static_cast<double>(1<< 4))
	85	GPSADDBITSFLOAT(15, eph._Crs, 1.0/static_cast<double>(1<< 4))
	86	GPSADDBITSFLOAT(14, eph._IDOT, M_PI/static_cast<double>(1<<30)/static_cast<double>(1<<13))
	87	GPSADDBITSFLOAT(32, eph._M0, M_PI/static_cast<double>(1<<30)/static_cast<double>(1<<1))
	88	GPSADDBITS(16, static_cast<int>(eph._TOEsec)>>4)
	89	GPSADDBITSFLOAT(32, eph._e, 1.0/static_cast<double>(1<<30)/static_cast<double>(1<<3))
	90	GPSADDBITSFLOAT(32, eph._sqrt_A, 1.0/static_cast<double>(1<<19))
	91	GPSADDBITSFLOAT(32, eph._OMEGA0, M_PI/static_cast<double>(1<<30)/static_cast<double>(1<<1))
	92	GPSADDBITSFLOAT(32, eph._omega, M_PI/static_cast<double>(1<<30)/static_cast<double>(1<<1))
	93	GPSADDBITSFLOAT(22, eph._OMEGADOT, M_PI/static_cast<double>(1<<30)/static_cast<double>(1<<11))
	94	GPSADDBITSFLOAT(32, eph._i0, M_PI/static_cast<double>(1<<30)/static_cast<double>(1<<1))
	95	GPSADDBITS(2, 0) /* padding */
	96	GPSADDBITS(2, 0) /* padding */
	97	} else {
[6814]	98	GPSADDBITS(12, 1019)
[6819]	99	GPSADDBITS(6,eph._prn.number())
	100	GPSADDBITS(10, eph._TOC.gpsw())
	101	GPSADDBITS(4, ura)
	102	GPSADDBITS(2,eph._L2Codes)
[8812]	103	GPSADDBITSFLOAT(14, eph._IDOT, M_PI/static_cast<double>(1<<30)/static_cast<double>(1<<13))
[6819]	104	GPSADDBITS(8, eph._IODE)
	105	GPSADDBITS(16, static_cast<int>(eph._TOC.gpssec())>>4)
[8812]	106	GPSADDBITSFLOAT(8, eph._clock_driftrate, 1.0/static_cast<double>(1<<30)/static_cast<double>(1<<25))
	107	GPSADDBITSFLOAT(16, eph._clock_drift, 1.0/static_cast<double>(1<<30)/static_cast<double>(1<<13))
	108	GPSADDBITSFLOAT(22, eph._clock_bias, 1.0/static_cast<double>(1<<30)/static_cast<double>(1<<1))
[6819]	109	GPSADDBITS(10, eph._IODC)
	110	GPSADDBITSFLOAT(16, eph._Crs, 1.0/static_cast<double>(1<<5))
[8812]	111	GPSADDBITSFLOAT(16, eph._Delta_n, M_PI/static_cast<double>(1<<30)/static_cast<double>(1<<13))
[6819]	112	GPSADDBITSFLOAT(32, eph._M0, M_PI/static_cast<double>(1<<30)/static_cast<double>(1<<1))
	113	GPSADDBITSFLOAT(16, eph._Cuc, 1.0/static_cast<double>(1<<29))
	114	GPSADDBITSFLOAT(32, eph._e, 1.0/static_cast<double>(1<<30)/static_cast<double>(1<<3))
	115	GPSADDBITSFLOAT(16, eph._Cus, 1.0/static_cast<double>(1<<29))
	116	GPSADDBITSFLOAT(32, eph._sqrt_A, 1.0/static_cast<double>(1<<19))
	117	GPSADDBITS(16, static_cast<int>(eph._TOEsec)>>4)
	118	GPSADDBITSFLOAT(16, eph._Cic, 1.0/static_cast<double>(1<<29))
[8812]	119	GPSADDBITSFLOAT(32, eph._OMEGA0, M_PI/static_cast<double>(1<<30)/static_cast<double>(1<<1))
[6819]	120	GPSADDBITSFLOAT(16, eph._Cis, 1.0/static_cast<double>(1<<29))
	121	GPSADDBITSFLOAT(32, eph._i0, M_PI/static_cast<double>(1<<30)/static_cast<double>(1<<1))
	122	GPSADDBITSFLOAT(16, eph._Crc, 1.0/static_cast<double>(1<<5))
[8812]	123	GPSADDBITSFLOAT(32, eph._omega, M_PI/static_cast<double>(1<<30)/static_cast<double>(1<<1))
	124	GPSADDBITSFLOAT(24, eph._OMEGADOT, M_PI/static_cast<double>(1<<30)/static_cast<double>(1<<13))
[6819]	125	GPSADDBITSFLOAT(8, eph._TGD, 1.0/static_cast<double>(1<<30)/static_cast<double>(1<<1))
[7844]	126	GPSADDBITS(6, eph._health)
[6819]	127	GPSADDBITS(1, eph._L2PFlag)
[8852]	128	(eph._fitInterval == 4.0) ? fitIntervalFlag = 0 : fitIntervalFlag = 1;
	129	GPSADDBITS(1, fitIntervalFlag)
[6814]	130	}
[5852]	131
	132	startbuffer[0]=0xD3;
	133	startbuffer[1]=(size >> 8);
	134	startbuffer[2]=size;
	135	unsigned long i = CRC24(size+3, startbuffer);
	136	buffer[size++] = i >> 16;
	137	buffer[size++] = i >> 8;
	138	buffer[size++] = i;
	139	size += 3;
	140	return size;
	141	}
	142
	143	// build up RTCM3 for GLONASS
	144	////////////////////////////////////////////////////////////////////////////
	145	int t_ephEncoder::RTCM3(const t_ephGlo& eph, unsigned char *buffer)
	146	{
	147
	148	int size = 0;
	149	int numbits = 0;
	150	long long bitbuffer = 0;
	151	unsigned char *startbuffer = buffer;
	152	buffer= buffer+3;
	153
	154	GLONASSADDBITS(12, 1020)
[5853]	155	GLONASSADDBITS(6, eph._prn.number())
	156	GLONASSADDBITS(5, 7+eph._frequency_number)
[8182]	157	GLONASSADDBITS(1, eph._almanac_health)
	158	GLONASSADDBITS(1, eph._almanac_health_availablility_indicator)
	159	GLONASSADDBITS(2, eph._P1)
[7844]	160	int tki = static_cast<int>(eph._tki)+36060;
	161	if (tki > 86400) {tki -= 86400;}
[7849]	162	GLONASSADDBITS(5, static_cast<int>(tki)/(60*60))
	163	GLONASSADDBITS(6, (static_cast<int>(tki)/60)%60)
	164	GLONASSADDBITS(1, (static_cast<int>(tki)/30)%30)
[7844]	165	GLONASSADDBITS(1, eph._health)
[8182]	166	GLONASSADDBITS(1, eph._P2)
[5853]	167	unsigned long long timeofday = (static_cast<int>(eph._tt.gpssec()+36060-eph._gps_utc)%86400);
[5852]	168	GLONASSADDBITS(7, timeofday/60/15)
[5853]	169	GLONASSADDBITSFLOATM(24, eph._x_velocity*1000, 1000.0/static_cast<double>(1<<20))
	170	GLONASSADDBITSFLOATM(27, eph._x_pos*1000, 1000.0/static_cast<double>(1<<11))
	171	GLONASSADDBITSFLOATM(5, eph._x_acceleration*1000, 1000.0/static_cast<double>(1<<30))
	172	GLONASSADDBITSFLOATM(24, eph._y_velocity*1000, 1000.0/static_cast<double>(1<<20))
	173	GLONASSADDBITSFLOATM(27, eph._y_pos*1000, 1000.0/static_cast<double>(1<<11))
	174	GLONASSADDBITSFLOATM(5, eph._y_acceleration*1000, 1000.0/static_cast<double>(1<<30))
	175	GLONASSADDBITSFLOATM(24, eph._z_velocity*1000, 1000.0/static_cast<double>(1<<20))
	176	GLONASSADDBITSFLOATM(27,eph._z_pos*1000, 1000.0/static_cast<double>(1<<11))
	177	GLONASSADDBITSFLOATM(5, eph._z_acceleration*1000, 1000.0/static_cast<double>(1<<30))
[8182]	178	GLONASSADDBITS(1, eph._P3)
	179	GLONASSADDBITSFLOATM(11, eph._gamma, 1.0/static_cast<double>(1<<30)/static_cast<double>(1<<10))
	180	GLONASSADDBITS(2, eph._M_P) /* GLONASS-M P */
	181	GLONASSADDBITS(1, eph._M_l3) /* GLONASS-M ln(3) */
[5853]	182	GLONASSADDBITSFLOATM(22, eph._tau, 1.0/static_cast<double>(1<<30))
[8182]	183	GLONASSADDBITSFLOATM(5, eph._M_delta_tau, 1.0/static_cast<double>(1<<30)) /* GLONASS-M delta tau */
[5853]	184	GLONASSADDBITS(5, eph._E)
[8182]	185	GLONASSADDBITS(1, eph._M_P4) /* GLONASS-M P4 */
	186	GLONASSADDBITS(4, eph._M_FT) /* GLONASS-M FT */
	187	GLONASSADDBITS(11, eph._M_NT) /* GLONASS-M NT */
	188	GLONASSADDBITS(2, eph._M_M) /* GLONASS-M active? */
	189	GLONASSADDBITS(1, eph._additional_data_availability) /* GLONASS additional data */
	190	GLONASSADDBITS(11, eph._NA) /* GLONASS NA */
	191	GLONASSADDBITSFLOATM(32, eph._tauC, 1.0/static_cast<double>(1<<30)/static_cast<double>(1<<1)) /* GLONASS tau C */
	192	GLONASSADDBITS(5, eph._M_N4) /* GLONASS-M N4 */
	193	GLONASSADDBITSFLOATM(22, eph._M_tau_GPS, 1.0/static_cast<double>(1<<30)) /* GLONASS-M tau GPS */
	194	GLONASSADDBITS(1, eph._M_l5) /* GLONASS-M ln(5) */
[5852]	195	GLONASSADDBITS(7, 0) /* Reserved */
	196
	197	startbuffer[0]=0xD3;
	198	startbuffer[1]=(size >> 8);
	199	startbuffer[2]=size;
	200	unsigned long i = CRC24(size+3, startbuffer);
	201	buffer[size++] = i >> 16;
	202	buffer[size++] = i >> 8;
	203	buffer[size++] = i;
	204	size += 3;
	205	return size;
	206	}
	207
	208	// build up RTCM3 for Galileo
	209	////////////////////////////////////////////////////////////////////////////
	210	int t_ephEncoder::RTCM3(const t_ephGal& eph, unsigned char *buffer) {
	211	int size = 0;
	212	int numbits = 0;
	213	long long bitbuffer = 0;
	214	unsigned char *startbuffer = buffer;
	215	buffer= buffer+3;
	216
[6819]	217	int SISA = indexFromAccuracy(eph._SISA, eph.type());
[6799]	218
[6812]	219	GALILEOADDBITS(12, eph._inav ? 1046 : 1045)
[5853]	220	GALILEOADDBITS(6, eph._prn.number())
[6869]	221	GALILEOADDBITS(12, eph._TOC.galw())
[5853]	222	GALILEOADDBITS(10, eph._IODnav)
[6819]	223	GALILEOADDBITS(8, SISA)
[8812]	224	GALILEOADDBITSFLOAT(14, eph._IDOT, M_PI/static_cast<double>(1<<30)/static_cast<double>(1<<13))
[5853]	225	GALILEOADDBITS(14, eph._TOC.gpssec()/60)
[8812]	226	GALILEOADDBITSFLOAT(6, eph._clock_driftrate, 1.0/static_cast<double>(1<<30)/static_cast<double>(1<<29))
	227	GALILEOADDBITSFLOAT(21, eph._clock_drift, 1.0/static_cast<double>(1<<30)/static_cast<double>(1<<16))
	228	GALILEOADDBITSFLOAT(31, eph._clock_bias, 1.0/static_cast<double>(1<<30)/static_cast<double>(1<<4))
[5853]	229	GALILEOADDBITSFLOAT(16, eph._Crs, 1.0/static_cast<double>(1<<5))
[8812]	230	GALILEOADDBITSFLOAT(16, eph._Delta_n, M_PI/static_cast<double>(1<<30)/static_cast<double>(1<<13))
[5853]	231	GALILEOADDBITSFLOAT(32, eph._M0, M_PI/static_cast<double>(1<<30)/static_cast<double>(1<<1))
	232	GALILEOADDBITSFLOAT(16, eph._Cuc, 1.0/static_cast<double>(1<<29))
	233	GALILEOADDBITSFLOAT(32, eph._e, 1.0/static_cast<double>(1<<30)/static_cast<double>(1<<3))
	234	GALILEOADDBITSFLOAT(16, eph._Cus, 1.0/static_cast<double>(1<<29))
	235	GALILEOADDBITSFLOAT(32, eph._sqrt_A, 1.0/static_cast<double>(1<<19))
	236	GALILEOADDBITS(14, eph._TOEsec/60)
	237	GALILEOADDBITSFLOAT(16, eph._Cic, 1.0/static_cast<double>(1<<29))
[8812]	238	GALILEOADDBITSFLOAT(32, eph._OMEGA0, M_PI/static_cast<double>(1<<30)/static_cast<double>(1<<1))
[5853]	239	GALILEOADDBITSFLOAT(16, eph._Cis, 1.0/static_cast<double>(1<<29))
	240	GALILEOADDBITSFLOAT(32, eph._i0, M_PI/static_cast<double>(1<<30)/static_cast<double>(1<<1))
	241	GALILEOADDBITSFLOAT(16, eph._Crc, 1.0/static_cast<double>(1<<5))
[8812]	242	GALILEOADDBITSFLOAT(32, eph._omega, M_PI/static_cast<double>(1<<30)/static_cast<double>(1<<1))
	243	GALILEOADDBITSFLOAT(24, eph._OMEGADOT, M_PI/static_cast<double>(1<<30)/static_cast<double>(1<<13))
	244	GALILEOADDBITSFLOAT(10, eph._BGD_1_5A, 1.0/static_cast<double>(1<<30)/static_cast<double>(1<<2))
[8813]	245	if(eph._inav) {
[8812]	246	GALILEOADDBITSFLOAT(10, eph._BGD_1_5B, 1.0/static_cast<double>(1<<30)/static_cast<double>(1<<2))
[5853]	247	GALILEOADDBITS(2, static_cast<int>(eph._E5bHS))
[6812]	248	GALILEOADDBITS(1, eph._e5bDataInValid ? 1 : 0)
[6818]	249	GALILEOADDBITS(2, static_cast<int>(eph._E1_bHS))
	250	GALILEOADDBITS(1, eph._e1DataInValid ? 1 : 0)
[8812]	251	} else {
[5853]	252	GALILEOADDBITS(2, static_cast<int>(eph._E5aHS))
[6812]	253	GALILEOADDBITS(1, eph._e5aDataInValid ? 1 : 0)
[5852]	254	}
	255
[6818]	256	GALILEOADDBITS((eph._inav ? 2 : 7), 0)
[5852]	257
	258	startbuffer[0]=0xD3;
	259	startbuffer[1]=(size >> 8);
	260	startbuffer[2]=size;
	261	unsigned long i = CRC24(size+3, startbuffer);
	262	buffer[size++] = i >> 16;
	263	buffer[size++] = i >> 8;
	264	buffer[size++] = i;
	265	size += 3;
	266	return size;
	267	}
	268
[6615]	269	// build up RTCM3 for SBAS
	270	////////////////////////////////////////////////////////////////////////////
[6631]	271	int t_ephEncoder::RTCM3(const t_ephSBAS& eph, unsigned char* buffer) {
	272	int size = 0;
	273	int numbits = 0;
	274	long long bitbuffer = 0;
	275	unsigned char *startbuffer = buffer;
	276	buffer= buffer+3;
	277
[6819]	278	int ura = indexFromAccuracy(eph._ura, eph.type());
[6631]	279	SBASADDBITS(12, 1043)
	280	SBASADDBITS(6, eph._prn.number()-20)
	281	SBASADDBITS(8, eph._IODN)
	282	SBASADDBITS(13, static_cast<int>(eph._TOC.daysec())>>4)
[6819]	283	SBASADDBITS(4, ura)
[6631]	284	SBASADDBITSFLOAT(30, eph._x_pos, 0.08)
	285	SBASADDBITSFLOAT(30, eph._y_pos, 0.08)
	286	SBASADDBITSFLOAT(25, eph._z_pos, 0.4)
	287	SBASADDBITSFLOAT(17, eph._x_velocity, 0.000625)
	288	SBASADDBITSFLOAT(17, eph._y_velocity, 0.000625)
	289	SBASADDBITSFLOAT(18, eph._z_velocity, 0.004)
	290	SBASADDBITSFLOAT(10, eph._x_acceleration, 0.0000125)
	291	SBASADDBITSFLOAT(10, eph._y_acceleration, 0.0000125)
	292	SBASADDBITSFLOAT(10, eph._z_acceleration, 0.0000625)
	293	SBASADDBITSFLOAT(12, eph._agf0, 1.0/static_cast<double>(1<<30)/static_cast<double>(1<<1))
	294	SBASADDBITSFLOAT(8, eph._agf1, 1.0/static_cast<double>(1<<30)/static_cast<double>(1<<10))
[6635]	295	SBASADDBITS(2,0);
[6631]	296
	297	startbuffer[0]=0xD3;
	298	startbuffer[1]=(size >> 8);
	299	startbuffer[2]=size;
	300	unsigned long i = CRC24(size+3, startbuffer);
	301	buffer[size++] = i >> 16;
	302	buffer[size++] = i >> 8;
	303	buffer[size++] = i;
	304	size += 3;
	305	return size;
[6403]	306	}
	307
[6615]	308	// build up RTCM3 for BDS
	309	////////////////////////////////////////////////////////////////////////////
	310	int t_ephEncoder::RTCM3(const t_ephBDS& eph, unsigned char* buffer) {
	311	int size = 0;
	312	int numbits = 0;
	313	long long bitbuffer = 0;
	314	unsigned char *startbuffer = buffer;
	315	buffer= buffer+3;
	316
[6819]	317	int URA = indexFromAccuracy(eph._URA, eph.type());
[9000]	318	BDSADDBITS(12, 1042)
[6615]	319	BDSADDBITS(6, eph._prn.number())
[8208]	320	BDSADDBITS(13, eph._TOC.bdsw())
[6819]	321	BDSADDBITS(4, URA);
[6615]	322	BDSADDBITSFLOAT(14, eph._IDOT, M_PI/static_cast<double>(1<<30)/static_cast<double>(1<<13))
	323	BDSADDBITS(5, eph._AODE)
[6812]	324	BDSADDBITS(17, static_cast<int>(eph._TOC.bdssec())>>3)
[8812]	325	BDSADDBITSFLOAT(11, eph._clock_driftrate, 1.0/static_cast<double>(1<<30)/static_cast<double>(1<<30)/static_cast<double>(1<<6))
[6615]	326	BDSADDBITSFLOAT(22, eph._clock_drift, 1.0/static_cast<double>(1<<30)/static_cast<double>(1<<20))
	327	BDSADDBITSFLOAT(24, eph._clock_bias, 1.0/static_cast<double>(1<<30)/static_cast<double>(1<<3))
	328	BDSADDBITS(5, eph._AODC)
	329	BDSADDBITSFLOAT(18, eph._Crs, 1.0/static_cast<double>(1<<6))
	330	BDSADDBITSFLOAT(16, eph._Delta_n, M_PI/static_cast<double>(1<<30)/static_cast<double>(1<<13))
	331	BDSADDBITSFLOAT(32, eph._M0, M_PI/static_cast<double>(1<<30)/static_cast<double>(1<<1))
	332	BDSADDBITSFLOAT(18, eph._Cuc, 1.0/static_cast<double>(1<<30)/static_cast<double>(1<<1))
	333	BDSADDBITSFLOAT(32, eph._e, 1.0/static_cast<double>(1<<30)/static_cast<double>(1<<3))
	334	BDSADDBITSFLOAT(18, eph._Cus, 1.0/static_cast<double>(1<<30)/static_cast<double>(1<<1))
	335	BDSADDBITSFLOAT(32, eph._sqrt_A, 1.0/static_cast<double>(1<<19))
[6812]	336	BDSADDBITS(17, static_cast<int>(eph._TOE.bdssec())>>3)
[6615]	337	BDSADDBITSFLOAT(18, eph._Cic, 1.0/static_cast<double>(1<<30)/static_cast<double>(1<<1))
	338	BDSADDBITSFLOAT(32, eph._OMEGA0, M_PI/static_cast<double>(1<<30)/static_cast<double>(1<<1))
	339	BDSADDBITSFLOAT(18, eph._Cis, 1.0/static_cast<double>(1<<30)/static_cast<double>(1<<1))
	340	BDSADDBITSFLOAT(32, eph._i0, M_PI/static_cast<double>(1<<30)/static_cast<double>(1<<1))
[6619]	341	BDSADDBITSFLOAT(18, eph._Crc, 1.0/static_cast<double>(1<<6))
[6615]	342	BDSADDBITSFLOAT(32, eph._omega, M_PI/static_cast<double>(1<<30)/static_cast<double>(1<<1))
	343	BDSADDBITSFLOAT(24, eph._OMEGADOT, M_PI/static_cast<double>(1<<30)/static_cast<double>(1<<13))
	344	BDSADDBITSFLOAT(10, eph._TGD1, 0.0000000001)
	345	BDSADDBITSFLOAT(10, eph._TGD2, 0.0000000001)
	346	BDSADDBITS(1, eph._SatH1)
[6627]	347	BDSADDBITS(1, 0) /* reserved bit, fill up 8 bits */
[6615]	348
	349	startbuffer[0]=0xD3;
	350	startbuffer[1]=(size >> 8);
	351	startbuffer[2]=size;
	352	unsigned long i = CRC24(size+3, startbuffer);
	353	buffer[size++] = i >> 16;
	354	buffer[size++] = i >> 8;
	355	buffer[size++] = i;
	356	size += 3;
	357	return size;
[6403]	358	}
[7053]	359

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