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sgl_2020_fields_readme.txt
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HDF5 data fields for 2020 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
radar m filtered radar altimeter
topo m radar topography (WGS-84)
dem m digital elevation model from SRTM (WGS-84)
drape m planned survey drape (WGS-84)
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
mag_6_uc nT Mag 6: 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
ogs_mag nT OGS survey diurnal-corrected, levelled, magnetic field
ogs_alt m OGS survey, GPS altitude (WGS-84)
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
pitch_rate deg/s avionics-computed pitch rate
roll_rate deg/s avionics-computed roll rate
yaw_rate deg/s avionics-computed yaw rate
lgtl_acc g avionics-computed longitudinal (forward) acceleration
ltrl_acc g avionics-computed lateral (starboard) acceleration
nrml_acc g avionics-computed normal (vertical) acceleration
tas m/s avionics-computed true airspeed
pitot_p kPa avionics-computed pitot pressure
static_p kPa avionics-computed static pressure
total_p kPa avionics-computed total pressure
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
cur_srvo_o A current sensor: INS outer servo
cur_srvo_m A current sensor: INS middle servo
cur_srvo_i A current sensor: INS inner servo
cur_heat A current sensor: INS heater
cur_acpwr A current sensor: aircraft power
cur_outpwr A current sensor: system output power
cur_bat_1 A current sensor: battery 1
cur_bat_2 A current sensor: battery 2
vol_acpwr V voltage sensor: aircraft power
vol_outpwr V voltage sensor: system output power
vol_bat_1 V voltage sensor: battery 1
vol_bat_2 V voltage sensor: battery 2
vol_res_p V voltage sensor: resolver board (+)
vol_res_n V voltage sensor: resolver board (-)
vol_back_p V voltage sensor: backplane (+)
vol_back_n V voltage sensor: backplane (-)
vol_gyro_1 V voltage sensor: gyroscope 1
vol_gyro_2 V voltage sensor: gyroscope 2
vol_acc_p V voltage sensor: INS accelerometers (+)
vol_acc_n V voltage sensor: INS accelerometers (-)
vol_block V voltage sensor: block
vol_back V voltage sensor: backplane
vol_srvo V voltage sensor: servos
vol_cabt V voltage sensor: cabinet
vol_fan V voltage sensor: cooling fan
================================================================================
Notes on specific flight data fields:
radar
- unavailable at some times due to flown altitude exceeding instrument range
ins_pitch, ins_roll, ins_yaw
- convention: yaw clockwise from north, then pitch up, then roll to starboard
ogs_mag & ogs_alt
- included for reference only
- sampled from original Ontario Geological Survey flown in 2013
- unavailable at some times due to flown position not over original OGS survey
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
lgtl_acc, ltrl_acc, nrml_acc
- Garmin avionics module 010-0G600-00 (https://www.garmin.com/en-US/p/6427)
- nrml_acc does not include gravity term (body frame)
================================================================================
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
For Flt1008 & Flt1009, orientation was modified into diamond pattern
For Flt1009, Mag 4 was moved inward 25cm
Sensor Description X Y Z
------------------------------------------------------------------------
Mag 1 tail stinger -12.01 0 1.37
Mag 2 port diamond vertex, rear floor -3.77 0.60 0.10
Mag 3 forward diamond vertex, rear floor -3.17 0 0.11
Mag 4 starboard diamond vertex, rear floor -3.77 -0.60 0.12 *Flt1008
Mag 4 starboard diamond vertex, rear floor -3.77 -0.35 0.12 *Flt1009
Mag 5 aft diamond vertex, rear floor -4.37 0 0.10
Mag 6 center of diamond, rear floor -3.77 0 0.19
Flux A front cabin, near battery -0.73 -0.60 0
Flux B tail at base of stinger -8.92 0 0.96
Flux C mid cabin starboard side -1.56 -0.55 0
Flux D mid-rear cabin, near fuel tank -2.35 -0.55 0