wapp_header_08.h
1 /*
2  RCS: $Id: wapp_header_08.h,v 1.1 2008/01/17 20:59:40 demorest Exp $
3  wapp_head.h - header parameters for WAPP (Wideband Arecibo Pulsar Processor)
4  This structure (WAPP_HEADER) is based on the PSPM-style headers but has
5  been somewhat simplified to include just essential/relevant parameters.
6 */
7 
8 //#define HEADER_VERSION 8
9 
10 /* lagformat for wapp_header */
11 
12 //#define INTLAGS 0 /* 16 bit integers - searching only */
13 //#define LONGLAGS 1 /* 32 bit integers - searching only */
14 //#define FLOATLAGS 2 /* 32 bit float ACF/CCFs folding only */
15 //#define FLOATSPEC 3 /* 32 bit float fftd ACFs folding only */
16 //#define BYTELAGS 4 /* 8 bit integers ACF/CCF searching only */
17 //#define NIBBLAGS 5 /* 4 bit integers ACF/CCF searching only */
18 //#define FOLD32 8 /* bit mask with FLOATLAGS and FLOATSPEC */
19  /* if on 32 bit folding is turned on */
20 
21 struct WAPP_HEADER_v8 {
22 
23  int32_t header_version; /* some integer that increments with each revision */
24  int32_t header_size; /* size (in bytes) of this header (nom =1024) */
25  char obs_type[24]; /* what kind of observation is this */
26  /* PULSAR_SEARCH */
27  /* PULSAR_FOLDING */
28  /* SPECTRA_TOTALPOWER */
29 /*
30  The following are obtained from current telescope status display
31  note that start AST/LST are for reference purposes only and should
32  not be taken as accurate time stamps. The time stamp can be derived
33  from the obs_date/start_time variables further down in the structure.
34 */
35  double src_ra; /* requested ra J2000 (10000*hr+100*min+sec) */
36  double src_dec; /* requested dec J2000 (10000*deg+100*min+sec) */
37  double start_az; /* telescope azimuth at start of scan (deg) */
38  double start_za; /* telescope zenith angle at start of scan (deg) */
39  double start_ast; /* AST at start of scan (sec) */
40  double start_lst; /* local siderial time at start of scan (sec) */
41 /*
42  In the following, anything not supplied/requested by the user
43  is assumed to be calculated by WAPP when it writes the header
44 */
45  double cent_freq; /* user-supplied band center frequency (MHz) */
46  double obs_time; /* user-requested length of this integration (s) */
47  double samp_time; /* user-requested sample time (us) */
48  double wapp_time; /* actual sample time (us) i.e. requested+dead time */
49  double bandwidth; /* total bandwidth (MHz) for this observation */
50 
51  int32_t num_lags; /* user-requested number of lags per dump per spect */
52  int32_t scan_number; /* built by WAPP from year+daynumber+3-digit-number */
53 
54  char src_name[24]; /* user-supplied source name (usually pulsar name) */
55  char obs_date[24]; /* built by WAPP from yyyymmdd */
56  char start_time[24]; /* UT seconds after midnight (start on 1-sec tick) */
57  char project_id[24]; /* user-supplied AO proposal number (XYYYY) */
58  char observers[24]; /* observer(s) name(s) */
59 
60  int32_t nifs; /* user-requested: number of IFs to be recorded */
61  int32_t level; /* user-requested: 1 means 3-level; 2 mean 9-level */
62  int32_t sum; /* user-requested: 1 means that data is sum of IFs */
63  int32_t freqinversion; /* 1 band is inverted, else band is not inverted */
64  int64_t timeoff; /* number of reads between obs start and snap block */
65  int32_t lagformat; /* 0=16 bit uint lags , 1=32 bit uint lags */
66  /* 2=32 bit float lags, 3=32 bit float spectra */
67  int32_t lagtrunc; /* if we truncate data (0 no trunc) */
68  /* for 16 bit lagmux modes, selects which 16 bits */
69  /* of the 32 are included as data */
70  /* 0 is bits 15-0 1,16-1 2,17-2...7,22-7 */
71  int32_t firstchannel; /* 0 when correlator channel a is first, 1 if b */
72  int32_t nbins; /* number of time bins for pulsar folding mode */
73  /* doulbles as maxrecs for snap mode */
74  int32_t isfolding; /* is folding selected */
75  int32_t isalfa; /* is ALFA selected */
76  double dumptime; /* folded integrations for this period of time */
77  double power_analog[2]; /* Power measured by Analog Detector */
78 /*
79  In the following, pulsar-specific information is recorded for use
80  by folding programs e.g. the quick-look software. This is passed to
81  WAPP by psrcontrol at the start of the observation.
82 
83  The apparent pulse phase and frequency at time "dt" minutes with
84  respect to the start of the observation are then calculated as:
85 
86  phase = rphase + dt*60*f0 + coeff[0] + dt*coeff[1] + dt*dt*coeff[2] + ...
87  freq(Hz) = f0 + (1/60)*(coeff[1] + 2*dt*coeff[2] + 3*dt*dt*coeff[3] + ...)
88 
89  where the C notation has been used (i.e. coeff[0] is first coefficient etc)
90  for details, see TEMPO notes (http://www.naic.edu/~pulsar/docs/tempo.txt)
91 */
92  double psr_dm; /* pulsar's dispersion measure (cm-3 pc) */
93  double rphase[16]; /* reference phase of pulse (0-1) */
94  double psr_f0[16]; /* pulse frequency at reference epoch (Hz) */
95  double poly_tmid[16]; /* mid point of polyco in (MJD) modified Julian date */
96  double coeff[192]; /* polynomial coefs made by TEMPO, 16 sets of 12 */
97  int32_t num_coeffs[16]; /* number of coefficients */
98  char hostname[24]; /* ascii hostname of machine that took this data */
99  int32_t fold_bits; /* 0 if 16 bits (old default) 1 if 32 bit folding */
100  int32_t iflo_flip; /* consider entire iflo and determine flip */
101  int32_t attena; /* first board parallel port value */
102  int32_t attenb; /* second board parallel port value */
103 
104 /* alfa info */
105 
106  double rfeed_offaz[7]; /* deg az rotated offset all alfa beam to center */
107  double rfeed_offza[7]; /* deg za rotated offset all alfa beam to center */
108  double prfeed_offaz; /* deg az offset to center of alfa beam */
109  double prfeed_offza; /* deg za offset to center of alfa beam */
110  double alfa_raj[7]; /* hr starting actual ra position of alfa beams */
111  double alfa_decj[7]; /* deg starting actual dec position of alfa beams */
112  double alfa_az[7]; /* deg starting actual az position of alfa beams */
113  double alfa_za[7]; /* deg starting actual za postion of alfa beams */
114  double alfa_ang; /* deg alfa rotation angle */
115  double para_ang; /* deg paralactic angle of center beam */
116  char frontend[24]; /* receiver abbrev name */
117 
118 /* add iflo data */
119 
120  double syn1; /* upstairs synthesizer freq Hz */
121  double synfrq[4]; /* downstairs synthesizers (Hz) */
122 
123 
124  unsigned char prfeed; /* centered alfa beam */
125  unsigned char shcl; /* true if receiver shutter closed */
126  unsigned char sbshcl; /* true if Sband receiver shutter closed */
127 
128  unsigned char rfnum; /* position of the receiver selectror */
129  unsigned char zmnormal; /* transfer switch to reverse channels, true normal */
130  unsigned char rfattn[2]; /* attenuator position */
131  unsigned char ifnum; /* if selector, 1/300 2/750, 3/1500, 4/10GHz1500, 5-thru */
132  unsigned char ifattn[2]; /* IF attenuator positions */
133  unsigned char fiber; /* true fi fiber is chosen (always the case) */
134  unsigned char ac2sw; /* ac power to various instruments and other stuff */
135  unsigned char if750nb; /* narrow band 750 filter selected */
136 
137  unsigned char phbsig; /* converter combiner signal phase adjust */
138  unsigned char hybrid; /* converter combiner hybrid */
139  unsigned char phblo; /* convert combiner lo phase adjust */
140 
141 /* downstairs */
142 
143  unsigned char xfnormal; /* transfer switch true if normal */
144  unsigned char noise; /* noise on */
145  unsigned char gain[2]; /* gain of downstairs amps */
146  unsigned char inpfrq; /* input distributor position */
147  unsigned char mixer[4]; /* mixer source switches */
148  unsigned char vlbainp; /* vlba input switch position */
149  unsigned char ampinp[4]; /* amplifier input source switches */
150  unsigned char extinp[4]; /* external input selector switches */
151  unsigned char syndest[4]; /* synthesizer destinations */
152  unsigned char calsrc; /* cal source bit */
153 
154  unsigned char vis30mhz; /* greg 1 ch 0 */
155  unsigned char pwrmet; /* power meter input switch */
156  unsigned char blank430; /* 430 blanking on */
157  unsigned char fill[6]; /* fill */
158 };
159 
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