dji P4 Multispectral Agriculture Drone User Guide
- June 9, 2024
- DJi
Table of Contents
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
---|---
- 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
- 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.-
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. -
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. -
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.
- Starting Operations
The following example includes instructions for 3D Map Area missions using DJI GS Pro.| |
---|---|---
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
| Takeoff Weight | 1487 g |
|---|---|
| Diagonal Distance (Propellers Excluded) | 350 mm |
| Max Service Ceiling Above Sea Level | 19685 ft (6000 m) |
| Max Ascent Speed | 6 m/s (automatic flight); 5 m/s (manual control) |
| Max Descent Speed | 3 m/s |
| Max Speed | 31 mph (50 kph) (P-mode); 36 mph (58 kph) (A-mode) |
| Max Flight Time | Approx. 27 minutes |
| Operating Temperature | 0° to 40° C (32° to 104° F) |
| Operating Frequency | 2.4000 GHz to 2.4835 GHz (Europe, Japan, Korea) |
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
---|---
● Mapping Functions
Ground Sample Distance (GSD)| (H/18.9) cm/pixel, H indicates the aircraft
altitude relative to the area mapped (unit: m)
---|---
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
| Controllable Range | Pitch: -90° to +30° |
|---|
● Vision System
Velocity Range| ≤ 31 mph (50 kph) at 6.6 ft (2 m) above ground with adequate
lighting
---|---
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)
---|---
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]
---|---
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)
| Capacity | 5870 mAh |
|---|---|
| Voltage | 15.2 V |
| Battery Type | LiPo 4S |
| Energy | 89.2 Wh |
| Net Weight | 468 g |
| Operating Temperature | -10° to 40° C (14° to 104° F) |
| Charging Temperature | 5° to 40° C (41° to 104° F) |
| Max Charging Power | 160 W |
● Intelligent Flight Battery Charging Hub (P4CH)
| Voltage | 17.5 V |
|---|---|
| Operating Temperature | 5° to 40° C (41° to 104° F) |
● AC Power Adapter (PH4C160)
| Voltage | 17.4 V |
|---|---|
| Rated Power | 160 W |
- To comply with local laws and regulations, this frequency is not available in some countries or regions.
- 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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