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sgl_2021_fields_readme.txt
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HDF5 data fields for 2021 SGL flight data. Data sampled at 10Hz. Includes
magnetic sensors, inertial navigation system, avionics, and electrical
currents and voltages. (WGS-84) is altitude above WGS-84 ellipsoid.
================================================================================
Field Units Description
--------------------------------------------------------------------------------
line - line number
flight - flight number
year - year
doy - day of year
tt s fiducial seconds past midnight UTC
utm_x m x-coordinate, WGS-84 UTM zone 18N
utm_y m y-coordinate, WGS-84 UTM zone 18N
utm_z m z-coordinate, GPS altitude (WGS-84)
msl m z-coordinate, GPS altitude above EGM2008 Geoid
lat deg latitude, WGS-84
lon deg longitude, WGS-84
baro m barometric altimeter
ins_pitch deg INS-computed aircraft pitch
ins_roll deg INS-computed aircraft roll
ins_yaw deg INS-computed aircraft yaw
diurnal nT measured diurnal
mag_1_c nT Mag 1: compensated magnetic field
mag_1_lag nT Mag 1: lag-corrected magnetic field
mag_1_dc nT Mag 1: diurnal-corrected magnetic field
mag_1_igrf nT Mag 1: IGRF & diurnal-corrected magnetic field
mag_1_uc nT Mag 1: uncompensated magnetic field
mag_2_uc nT Mag 2: uncompensated magnetic field
mag_3_uc nT Mag 3: uncompensated magnetic field
mag_4_uc nT Mag 4: uncompensated magnetic field
mag_5_uc nT Mag 5: uncompensated magnetic field
flux_a_x nT Flux A: fluxgate x-axis
flux_a_y nT Flux A: fluxgate y-axis
flux_a_z nT Flux A: fluxgate z-axis
flux_a_t nT Flux A: fluxgate total
flux_b_x nT Flux B: fluxgate x-axis
flux_b_y nT Flux B: fluxgate y-axis
flux_b_z nT Flux B: fluxgate z-axis
flux_b_t nT Flux B: fluxgate total
flux_c_x nT Flux C: fluxgate x-axis
flux_c_y nT Flux C: fluxgate y-axis
flux_c_z nT Flux C: fluxgate z-axis
flux_c_t nT Flux C: fluxgate total
flux_d_x nT Flux D: fluxgate x-axis
flux_d_y nT Flux D: fluxgate y-axis
flux_d_z nT Flux D: fluxgate z-axis
flux_d_t nT Flux D: fluxgate total
ins_acc_x m/s^2 INS x-acceleration
ins_acc_y m/s^2 INS y-acceleration
ins_acc_z m/s^2 INS z-acceleration
ins_wander rad INS-computed wander angle (ccw from north)
ins_lat rad INS-computed latitude
ins_lon rad INS-computed longitude
ins_alt m INS-computed altitude (WGS-84)
ins_vn m/s INS-computed north velocity
ins_vw m/s INS-computed west velocity
ins_vu m/s INS-computed vertical (up) velocity
cur_com_1 A current sensor: aircraft radio 1
cur_ac_hi A current sensor: air conditioner fan high
cur_ac_lo A current sensor: air conditioner fan low
cur_tank A current sensor: cabin fuel pump
cur_flap A current sensor: flap motor
cur_strb A current sensor: strobe lights
vol_block V voltage sensor: block
vol_back V voltage sensor: backplane
vol_cabt V voltage sensor: cabinet
vol_fan V voltage sensor: cooling fan
================================================================================
Notes on specific flight data fields:
ins_pitch, ins_roll, ins_yaw
- convention: yaw clockwise from north, then pitch up, then roll to starboard
ins_acc_x, ins_acc_y, ins_acc_z
- AIRGrav (airborne gravimeter) system (http://www.sgl.com/Gravity.html)
- 3-axis gimballed INS, run in local-level, wander-angle mechanization
- corrected for temperature, misalignment, and scale factor
- digitizers used for accelerometers are sigma-delta type and require low-pass
filtering to increase resolution
- ins_acc_x: nominally horizontal, ccw from north by ins_wander [rad]
- ins_acc_y: nominally horizontal, 90 [deg] ccw from ins_acc_x
- ins_acc_z: nominally vertical (up), includes gravity term (~navigation frame)
ins_alt
- combined GPS/inertial altitude computed in real time, contains lag error
================================================================================
Magnetometer/Fluxgate positions in reference to front seat rail [m]
- positive directions: forward (X), port (Y), up (Z)
Sensor Description X Y Z
-------------------------------------------------------------------
Mag 1 Tail stinger -12.01 0 1.37
Mag 2 Front cabin, aft of cockpit -0.60 -0.36 0
Mag 3 Mid cabin, near INS -1.28 -0.36 0
Mag 4 Rear cabin, floor -3.53 0 0
Mag 5 Rear cabin, ceiling -3.79 0 1.20
Flux A Mid cabin, near fuel tank -3.27 -0.60 0
Flux B Tail, base of stinger -8.92 0 0.96
Flux C Rear cabin, port -4.06 0.42 0
Flux D Rear cabin, starboard -4.06 -0.42 0