Dorade Format

COMMENT BLOCK
Byte	Type	Description
0	char[4]	Comment descriptor identifier: ASCII characters "COMM" stand for Comment Descriptor.
4	long	Comment descriptor length in bytes.
8	char [500]	comment (N byte ascii, n divisible by 4)

VOLUME DESCRIPTOR
Byte	Type	Description
0	char[4]	Volume descriptor identifier: ASCII characters "VOLD" stand for Volume Descriptor.
4	long	Volume descriptor length in bytes.
8	short	ELDORA/ASTRAEA field tape format revision number.
10	short	Volume Number into current tape.
12	long	Maximum number of bytes in any physical record in this volume.
16	char[20]	Project number or name.
36	short	Year data taken in years.
38	short	Month data taken in months.
40	short	Day data taken in days.
42	short	Hour data taken in hours.
44	short	Minute data taken in minutes.
46	short	Second data taken in seconds.
48	char[8]	Flight number.
56	char[8]	Identifier of facility that generated this recording.
64	short	Year this recording was generated in years.
66	short	Month this recording was generated in months.
68	short	Day this recording was generated in days.
70	short	Total Number of sensor descriptors that follow.

RADAR DESCRIPTOR
Byte	Type	Description
0	char[4]	Identifier for a radar descriptor block (ascii characters "RADD").
4	long	Length of a radar descriptor block in bytes.
8	char [8]	Eight character radar name.
16	float	Radar/lidar constant
20	float	Typical peak power of the sensor in kw. Pulse energy is really the peak_power * pulse_width
24	float	Typical noise power of the sensor in dBm.
28	float	Gain of the receiver in db.
32	float	Gain of the antenna in db.
36	float	System Gain in db. (Ant G - WG loss)
40	float	Horizontal beam width in degrees. Beam divergence in milliradians is equivalent to beamwidth
44	float	Vertical beam width in degrees.
48	short	Radar Type (0)Ground, 1)Airborne Fore, 2)Airborne Aft, 3)airborne Tail, 4)Airborne Lower Fuselage, 5)Shipborne.
50	short	Scan Mode (0)Calibration, 1)PPI (constant Elevation) 2)Coplane, 3)RHI (Constant Azimuth), 4) Vertical Pointing, 5)Target (Stationary), 6)Manual, 7)Idle (Out of Control).
52	float	Requested rotational velocity of the antenna in degrees/sec.
56	float	Scan mode specific parameter #0 (Has different meaning for different scan modes).
60	float	Scan mode specific parameter #1.
64	short	Total number of parameter descriptor blocks for this radar.
66	short	Total number of additional descriptor block for this radar.
68	short	Data compression. 0 = none, 1 = HRD scheme.
70	short	Data Reduction algorithm: 1 = none, 2 = between 2 angles, 3 = Between concentric circles, 4 = Above/below certain altitudes.
72	float	1 = smallest positive angle in degrees, 2 = inner circle diameter, km, 4 = minimum altitude, km.
76	float	1 = largest positve angle, degress, 2 = outer cicle diameter, km, 4 = maximum altitude, km.
80	float	Longitude of radar in degrees.
84	float	Latitude of radar in degrees.
88	float	Altitude of radar above msl in km.
92	float	Effective unambiguous velocity, m/s.
96	float	Effective unambiguous range, km.
100	short	Number of frequencies transmitted.
102	short	Number of different inter-pulse periods transmitted.
104	float	Frequency 1.
108	float	Frequency 2.
112	float	Frequency 3.
116	float	Frequency 4.
120	float	Frequency 5.
124	float	Interpulse period 1.
128	float	Interpulse period 2.
132	float	Interpulse period 3.
136	float	Interpulse period 4.
140	float	Interpulse period 5.

PARAMETER DESCRIPTOR
Byte	Type	Description
0	char [4]	Parameter Descriptor identifier (ascii characters "PARM").
4	long	Parameter Descriptor length in bytes.
8	char [8]	Name of parameter being described.
16	char [40]	Detailed description of this parameter.
56	char [8]	Units parameter is written in.
64	short	Inter-pulse periods used. bits 0-1 = frequencies 1-2.
66	short	Frequencies used for this parameter.
68	float	Effective receiver bandwidth for this parameter in MHz.
72	short	Effective pulse width of parameter in m.
74	short	Polarization of the radar beam for this parameter (0 Horizontal,1 Vertical,2 Circular,3 Elliptical) in na.
76	short	Number of samples used in estimate for this parameter.
78	short	Binary format of radar data.
80	char [8]	Name of parameter upon which this parameter is thresholded (ascii characters NONE if not thresholded).
88	float	Value of threshold
92	float	Scale factor for parameter.
96	float	Bias factor for parameter.
100	long	Bad data flag.

CELL RANGE VECTOR
Byte	Type	Description
0	char[4]	Cell descriptor identifier: ASCII characters "CELV" stand for cell vector.
4	long	Comment descriptor length in bytes
8	long	Number of sample volumes
12	float	Distance from the radar to cell 1 in meters
4*n + 12	float	Distance from the radar to cell n in meters

CORRECTION FACTOR DESCRIPTOR
Byte	Type	Description
0	char [4]	Correction descriptor identifier: ASCII characters "CFAC" stand for Volume Descriptor.
4	long	Correction descriptor length in bytes.
8	float	Correction added to azimuth[deg]
12	float	Correction added to elevation[deg]
16	float	Correction used for range delay[m]
20	float	Correction added to radar longitude
24	float	Correction added to radar latitude
28	float	Correction added to pressure altitude (msl)[km]
32	float	Correction added to radar altitude above ground level(agl) [km]
36	float	Correction added to radar platform ground speed(E-W)[m/s]
40	float	Correction added to radar platform ground speed(N-S)[m/s]
44	float	Correction added to radar platform vertical velocity[m/s]
48	float	Correction added to radar platform heading [deg])
52	float	Correction added to radar platform roll[deg]
56	float	Correction added to radar platform pitch[deg]
60	float	Correction added to radar platform drift[deg]
64	float	Corrrection add to radar rotation angle [deg]
68	float	Correction added to radar tilt angle

SWEEP INFO BLOCK
Byte	Type	Description
0	char[4]	Comment descriptor identifier: ASCII characters "SWIB" stand for sweep info block Descriptor.
4	long	Sweep descriptor length in bytes.
8	char[8]	comment
16	long	Sweep number from the beginning of the volume
20	long	number of rays recorded in this sweep
24	float	true start angle [deg]
28	float	true stop angle [deg]
32	float	Fixed angle [deg]
36	long	Filter Flag 0=no filtering in use, 1 = On (Filtering algorithm should be described in the ASCII file at the beginning of the file)

RAY INFO BLOCK
Byte	Type	Description
0	char [4]	Identifier for a data ray info block (ascii characters "RYIB")
4	long	length of a data ray info block in bytes.
8	long	sweep number for this radar.
12	long	Julian Day
16	short	Hour in hours.
18	short	Minute in minutes.
20	short	Second in seconds.
22	short	Millisecond in milliseconds.
24	float	Azimuth in degrees.
28	float	Elevation in degrees.
32	float	Last measured peak transmitted power in kw.
36	float	Actual scan rate in degrees/second.
40	long	Ray Status, 0 = normal, 1 = transition, 2 = bad.

PLATFORM INFO BLOCK
Byte	Type	Description
0	char [4]	Identifier for the aircraft/ship parameters block (ascii characters ASIB)
4	long	Length in Bytes of the aircraft/ship arameters block
8	float	Antenna Longitude (Eastern Hemisphere is positive, West negative) in degrees
12	float	Antenna Latitude (Northern Hemisphere is positive, South Negative) in degrees
16	float	Antenna Altitude above mean sea level (MSL) in m
20	float	Antenna Altitude above ground level (AGL) in m
24	float	Antenna east-west ground speed (towards East is positive) in m/sec
28	float	Antenna north-south ground speed (towards North is positive) in m/sec
32	float	Antenna vertical velocity (Up is positive) in m/sec
36	float	Antenna heading (angle between rotodome rotational axis and true North, clockwise (looking down) positive) in degrees
40	float	Roll angle of aircraft tail section (Horizontal zero, Positive left wing up) in degrees
44	float	Pitch angle of rotodome (Horizontal is zero positive front up) in degrees
48	float	Antenna drift Angle. (angle between platform true velocity and heading, positive is drift more clockwise looking down) in degrees
52	float	Angle of the radar beam with respect to the airframe (zero is along vertical stabilizer, positive is clockwise) in deg
56	float	Angle of radar beam and line normal to longitudinal axis of aircraft, positive is towards nose of aircraft) in degrees
60	float	east - west wind velocity at the platform (towards East is positive) in m/sec
64	float	North - South wind velocity at the platform (towards North is positive) in m/sec
68	float	Vertical wind velocity at the platform (up is positive) in m/sec
72	float	Heading change rate in degrees/second.
76	float	Pitch change rate in degrees/second.

PARAMETER DATA BLOCK
Byte	Type	Description
0	char[4]	parameter data descriptor identifier: ASCII characters "RDAT" stand for sweep info block Descriptor.
4	long	parameter data descriptor length in bytes.
12	char[8]	name of parameter
16	Type as described in parameter data descriptor	Data (length as described in parameter data descriptor)