dji P4 Multispectral Agriculture Drone User Guide

P4 Multispectral Agriculture Drone
User Guide

P4 Multispectral

The P4 Multispectral is a high-precision drone capable of multispectral imaging functions. The imaging system contains six cameras with 1/2.9-inch CMOS sensors, including an RGB camera and a multispectral camera array containing five cameras, all at 2MP with global shutter, on a 3-axis stabilized gimbal. The spectral sunlight sensor on top of the aircraft detects the solar irradiance in real-time for image compensation, maximizing the accuracy of collected multispectral data. Image data can be used to generate multispectral maps for plant and soil status analysis. The aircraft has a built-in DJI™ Onboard D-RTK™, which provides precision data for centimeter- level positioning accuracy. Multi-directional obstacle sensing is enabled by forward, rear, and downward vision and infrared sensors.

1. Gimbal Cameras
(with six cameras corresponding to the wave bands below)
a. Red Edge (RE) b. Near-Infrared (NIR)
c. Green (G) d. Visible Light (RGB)
e. Red (R) f. Blue (B)
2. Downward Vision System
3. Micro USB Port
4. Camera/Linking Status Indicator and Link Button
5. Camera microSD Card Slot
6. Forward Vision System
7. Infrared Sensing System| 8. Front LEDs
9. Motors
10. Propellers
11. Aircraft Status Indicators
12. OCUSYNC™ Antennas
13. Onboard D-RTK Antenna
14. Spectral Sunlight Sensor
15. Rear Vision System
16. Intelligent Flight Battery
17. Power Button
18. Battery Level Indicators
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• This should be used with Network RTK service, a DJI D-RTK 2 High Precision GNSS Mobile Station (purchased additionally) or post-processed kinematic (PPK) data (recommended when RTK signal is weak during operation).
  The Vision and Infrared Sensing Systems are affected by surrounding conditions. Read the User Manual to learn more.

Remote Controller

The remote controller features DJI’s long-range transmission technology OcuSync that is capable of controlling the aircraft and the gimbal cameras at a maximum transmission range of 4.3 mi (7 km).
Connect an iPad to the remote controller via the USB port to use the DJI GS Pro app to plan and perform missions. Export the captured images for analysis and create multispectral maps. The remote controller has a rechargeable LiPo battery with a maximum battery life of approximately 6 hours.

1. Power Button
2. Return to Home (RTH) Button
3. Control Sticks
4. Status LED
5. Battery Level LEDs
6. Power Port
7. Mobile Device Holder
8. Small Device Positioning Tabs (for mobile phones)
9. Antennas
10. Handle Bar| 11. Gimbal Dial
12. Reserved Dial
13. Video Recording Button
14. Flight Mode Switch
15. Shutter Button*
16. Reserved Blank Button
17. C1 and C2 Buttons (customizable)
18. USB Port (for mobile device connection)
19. Micro USB Port
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The figure below shows the function that each control stick movement performs, using Mode 2 as an example. The left stick controls the aircraft’s altitude and heading, while the right stick controls its forward, backward, left and right movements. The gimbal dial controls the camera’s tilt.* The remote controller is able to reach its maximum transmission distance (FCC/NCC) in a wide open area with no Electro-Magnetic Interference, and at an altitude of about 400 ft (120 m).
The maximum runtime is tested under laboratory environment, only for your reference.
Pictures will only be taken when the shutter button is fully pressed.

Using the P4 Multispectral

1. Downloading the DJI GS Pro App
   The latest version of DJI GS Pro is required when using with the P4 Multispectral. Search for DJI GS Pro* in App Store or scan the QR code to download the app on your iPad.
   https://itunes.apple.com/app/dji-gs-pro/id1183717144?mt=8
   When using your P4 Multispectral for the first time, activate it using DJI GS Pro. Ensure that your iPad has access to the internet.

• Visit the official DJI website for more information about DJI GS Pro. https://www.dji.com/ground-station-pro 2. Checking Battery Levels
  Press once to check the battery level. Press once, then again and hold to turn on/off.

  3. Charging the Batteries
     ● Fully charge the batteries before using for the first time.
     ● Ensure to connect the Intelligent Flight Batteries to the charging hub as shown in the figure above.
     ● Ensure that the Mode Switch of the Intelligent Flight Battery charging hub is set to the Charging Mode position.

  4. Preparing the Remote Controller
     Try to keep the aircraft inside the optimal transmission zone. If the signal is weak, adjust the antennas or fly the aircraft closer.

  5. Preparing for Takeoff
     ****

     Black propeller rings go on motors with black dots.| Silver propeller rings go on motors without
     black dots.| Press the propeller down onto the mounting plate and rotate in
     the lock direction until secure.

● Check that the propellers are secure before each flight.

Remove the gimbal clamp from the camera.| Power on the remote controller and the aircraft.| Launch the app.
6. Flight
For a safe take-off, make sure that the Aircraft Status Indicators blink green slowly (using RTK* or GNSS for positioning).
Takeoff

Combination Stick Command to start/stop the motors| Left stick (in Mode 2) up slowly to take off

Landing
Left stick down slowly until you touch the ground
Hold for three seconds to stop the motors
● Spinning propellers can be dangerous. Stay away from spinning propellers and motors. DO NOT start the motors in confined spaces or when there are people nearby.
● Always keep your hands on the remote controller when the motors are spinning.
● Stopping motors mid-flight: Perform the CSC to stop the motors. This function can be enabled in DJI GS Pro. Only stop motors mid-flight in emergency situations when doing so can reduce the risk of damage or injury.
***** RTK positioning is recommended. Go to Mission View in DJI GS Pro, tap the icon or RTK on top of the screen to go to the RTK settings menu, and then select D-RTK 2 or Network RTK Account as the RTK data source. Enable the aircraft RTK at the bottom of the menu. Otherwise, the aircraft cannot use the RTK data.

7. Starting Operations
   The following example includes instructions for 3D Map Area missions using DJI GS Pro.| |
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   Create a 3D Map Area mission.| Configure mission parameters.| Tap camera preview to enter Camera View to configure camera settings*.
   | |
   Perform the mission.| Export the pictures.| Generate a map.

Specifications

● Aircraft

5.725 GHz to 5.850 GHz (Other countries/regions)[¹]
Transmission Power (EIRP)| 2.4 GHz: < 20 dBm (CE / MIC / KCC)
5.8 GHz: < 26 dBm (FCC / SRRC / NCC)
Hover Accuracy Range| RTK enabled and functioning properly:
Vertical: ±0.1 m; Horizontal: ±0.1 m
RTK disabled:
Vertical: ±0.1 m (with vision positioning); ±0.5 m (with GNSS positioning)
Horizontal: ±0.3 m (with vision positioning); ±1.5 m (with GNSS positioning)
Image Position Compensation| The relative positions of the centers of the six cameras’ CMOS and the phase center of the onboard D-RTK antenna have been calibrated and are recorded in the EXIF data of each image.

● GNSS
Single-Frequency High-Sensitivity GNSS GPS + BeiDou + Galileo[²] (Asia); GPS + GLONASS + Galileo[²] (other regions)

Multi-Frequency Multi-System High Precision RTK GNSS| Frequency Used
GPS: L1/L2; GLONASS: L1/L2; BeiDou: B1/B2; Galileo[²]: E1/E5
First-Fixed Time: < 50 s
Positioning Accuracy: Vertical 1.5 cm + 1 ppm (RMS); Horizontal 1 cm + 1 ppm (RMS).
1 ppm indicates error with a 1 mm increase over 1 km of movement.
Velocity Accuracy: 0.03 m/s
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● Mapping Functions

Ground Sample Distance (GSD)| (H/18.9) cm/pixel, H indicates the aircraft altitude relative to the area mapped (unit: m)
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Rate of Data Collection| Max operating area of approx. 0.63 km² for a single flight at an altitude of 180 m, i.e., GSD is approx. 9.52 cm/pixel, with a forward overlap rate of 80% and a side overlap ratio of 60%, during a flight that drains the battery from 100% to 30%.

● Gimbal

● Vision System

Velocity Range| ≤ 31 mph (50 kph) at 6.6 ft (2 m) above ground with adequate lighting
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Altitude Range| 0 – 33 ft (0 – 10 m)
Operating Range| 0 – 33 ft (0 – 10 m)
Obstacle Sensory Range| 2 – 98 ft (0.7 – 30 m)
Operating Environment| Surfaces with clear patterns and adequate lighting (> 15 lux)

● Camera

Sensors| Six 1/2.9” CMOS, including one RGB sensor for visible light imaging and five monochrome sensors for
multispectral imaging.
Each Sensor: Effective pixels 2.08 MP (2.12 MP in total)
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Filters| Blue (B): 450 nm ± 16 nm; Green (G): 560 nm ± 16 nm; Red (R): 650 nm ± 16 nm;
Red edge (RE): 730 nm ± 16 nm; Near-infrared (NIR): 840 nm ± 26 nm
Lenses| FOV (Field of View): 62.7°
Focal Length: 5.74 mm (35 mm format equivalent: 40 mm), autofocus set at ∞
Aperture: f/2.2
RGB Sensor ISO Range| 200 – 800
Monochrome Sensor Gain| 1 – 8x
Electronic Global Shutter| 1/100 – 1/20000 s (visible light imaging); 1/100 – 1/10000 s (multispectral imaging)
Max Image Size| 1600×1300 (4:3.25)
Photo Format| JPEG (visible light imaging) + TIFF (multispectral imaging)
Supported File Systems| FAT32 (≤ 32 GB); exFAT (> 32 GB)
Supported SD Cards| microSD with a minimum write speed of 15 MB/s. Max Capacity: 128 GB. Class 10 or UHS-I rating required
Operating Temperature| 0° to 40° C (32° to 104° F)

● Remote Controller

Operating Frequency| 2.4000 GHz to 2.4835 GHz (Europe, Japan, Korea)
5.725 GHz to 5.850 GHz (Other countries/regions)[¹]
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Transmission Power (EIRP)| 2.4 GHz: < 20 dBm (CE / MIC / KCC)
5.8 GHz: < 26 dBm (FCC / SRRC / NCC)
Max Transmission Distance| FCC / NCC: 4.3 mi (7 km); CE / MIC / KCC / SRRC: 3.1 mi (5 km)
(Unobstructed, free of interference)
Built-in Battery| 6000 mAh LiPo 2S
Operating Current / Voltage| 1.2 A @ 7.4 V
Mobile Device Holder| Tablets and smartphones
Operating Temperature| 0° to 40° C (32° to 104° F)

● Intelligent Flight Battery (PH4-5870mAh-15.2V)

● Intelligent Flight Battery Charging Hub (P4CH)

● AC Power Adapter (PH4C160)

1. To comply with local laws and regulations, this frequency is not available in some countries or regions.
2. Support for Galileo is coming soon.

※ This Quick Start Guide is subject to change without prior notice.
Download the latest version from
https://www.dji.com/p4-multispectral

DJI is a trademark of DJI.
Copyright © 2020 DJI All Rights Reserved.
P4 MULTISPECTRAL

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