At-field- Pre-Flight Checklist
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Revision as of 19:26, 7 December 2015 by Singhdj2
1.3. Preflight Checklist – At field before arming 1.3.1 Camera settings (Based on Canon PowerShot S100/S95/S110 Point & Shoot cameras) → General recommendations for aerial imagery: ❏ Keep the camera focal length fixed throughput the mission. ❏ Shoot in RAW since the RAW format retains maximum scene details and provides greater flexibility during post-processing. ❏ Use faster shutter speeds to avoid blur due to vehicle speed and vibration. ❏ Use gimbal to get maximum nadir shots of the scene and to avoid image blurring. → Choose one of the following camera shooting parameters: 1. Shutter Priority (Tv) mode: ❏ In Tv mode, only shutter speed needs to be adjusted, ISO and F-number are automatically adjusted by camera based on scene conditions. ❏ Shutter speed: fastest or close to fastest (for S100 canon, 1/1250, 1/1600, or 1/2000 would work, depending upon the light conditions). Tip: faster shutters less light hitting the sensor. ❏ Optional: Ev (exposure): 0, -1/3 or -2/3 (again adjust based on ambient light conditions) 2. Manual (M) mode: ❏ Shutter speed: fastest or close to fastest (for S100 canon, 1/1600 or 1/2000 would work, depending upon the UAV speed and weather conditions) ❏ ISO: ~80-250 (adjust based on ambient light). Hint: Higher ISO, brighter image but higher noise. ❏ Aperture (f-number): 4.0-5.6. Note: Small f-number means wider apertures and shallow depth of field. In our experience, F-number of 4-5.6 is a sweet spot. It is recommended that you play around with the manual settings to setup your camera to suit your specific requirements. ❏ Ev (exposure): -1/3 or -2/3. Again, adjust based on ambient light conditions. ❏ Additional note: Use the vertical bar with moving pointer to adjust the camera settings to get proper exposure (not too bright and dark). The pointer should point at or below the mid-mark. → Set the Manual Focus (MF) setting to infinity for above 5 meter altitude flights. → Image recording format: Camera raw (CR2) → Under MENU option, make sure: ❏ GPS ON ❏ MF-point ZOOM OFF ❏ Safety MF OFF ❏ Wind Filter OFF → Some general recommendations for aerial imagery: ❏ Keep the camera focal length fixed throughput the mission. ❏ Shoot in RAW since the RAW format retains maximum scene details and provides greater flexibility during post-processing. ❏ Use faster shutter speeds to avoid blur due to vehicle speed and vibration. ❏ Use gimbal to get maximum nadir shots of the scene and to avoid image blurring.
1.3.2 UAS In-field Pre-flight ❏ Place the UAV on a flat surface, plug-in the battery and close the lid. Note: Avoid any disturbance to the UAV during initial few seconds as the UAV performs automatic sensor-calibrations. ❏ Lock the SD card and insert it in camera. ❏ Switch-on the camera by pressing the preview button.Half-press the shutter to let the lens out. ❏ Set the camera parameters by following the instructions given in section 1.3.1. ❏ Attach the camera to the gimbal mount and plug-in the wire. ❏ Load and run CHDK script by half-pressing the camera shutter button. ❏ Open mission planner on field laptop and connect mission planner to UAV Autopilot using telemetry radio link. Use a correct COM PORT Number and 57600 Baud rate from the drop down menu on top right corner of mission planner software. Then hit connect. ❏ Check flight parameters (see parameter section below for detailed parameter list) ❏ Load proper mission waypoint file and write the waypoints into the Autopilot through radio link. Note: You can read back the WP from UAV to double check the correct WayPoints are written to the UAV. ❏ Make sure the GPS signal is good (3D fix: number of satellites > 7 and hdop < 2) and there is no error message flashing on the mission planner main window. ❏ Check if the camera trigger is working properly by walking the UAV. Note: Make sure the UAV safety light is flashing to avoid accidental arming. ❏ Check battery voltage. ❏ Turn the radio controller (RC) transmitter on. ❏ Check to make sure the RC switch positions are set to: ❏ Stabilized Mode [ON], RTL [OFF], Throttle [All the way Down]. ❏ Depending upon how the other RC switches are mapped, make sure the switches are set to a mode that is safe for take-off. ❏ Check the trims are zero (offsets to stick positions that can be set with small slide switches). ❏ Make sure no one is close to UAV and survey area.