PPK GNSS System for Multirotor and Fixed Wing UAV Drone Mapping




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We are pleased to propose an integrated direct geo-referencing system as a ready to use plug-in for mapping UAVs. A generic PPK (post processed kinematic) camera positioning system that integrates with most cameras on any UAV or manned aircraft. PPK produces high accuracy GNSS (GPS plus Glonass) camera positions to increase photogrammetric mapping accuracy and reduce ground control requirements.

The key to accuracy in any mapping or 3D modelling project is control. This can be either GCPs (ground control points) visible in the photos, or CPs (camera positions) where each photo was taken. Enabling your mapping data acquisition with accurate CPs can reduce or eliminate the need for GCPs, saving on ground survey crew time and cost.

How it works

This hardware operates independently of any UAV flight management system. Your UAV will operate as it does now, with onboard flight control using the existing autonomous GPS. The PPK system logs precise carrier phase GNSS data and camera trigger events to provide highly accurate camera positions after post processing.

The logged data is processed after the flight with base station data. You will need a survey grade GNSS unit logging data in the vicinity of the project, or you can download data from a local CORS station. A base receiver can be supplied if required.

After post-processing, the high-precision camera coordinates are input into your photogrammetry software with your images. With centimetre level camera positions, the mapping and modelling you produce will have the highest possible accuracy.

Why PPK?
Typical geo-referenced UAV systems implement real time kinematic (RTK) solutions using a variety of GPS receivers. RTK requires a stable radio link to receive base station data, which limits the range of the operation, can be prone to GPS signal blockage and can lose correction data and initialization with radio link outages, particularly due to the UAV flight dynamics, signal obstructions or long distance. These losses result in a smaller percentage of accurate camera positions being determined. The RTK radio receiver also adds weight to the UAV.


An alternative to RTK is post processed kinematic (PPK), where data is logged in the UAV and processed with base station data after the flight. There is no data loss or initialization loss as in RTK due to radio link limitations. All collected data is processed with similar algorithms to RTK, but forwards and backwards through the data. This ensures the most robust results possible.

PPK offers greater flexibility in operations, longer range from the base, is more reliable, more accurate and easier to use.

Base station data is required from a survey grade GNSS unit logging data in the vicinity of the project, or downloaded from a local CORS station. A base receiver can be supplied if required.


Please contact us if you would like to use a broadcast subscription service.


Hardware

  • Multi frequency GPS (L1/L2/L2C, L5), GLONASS (L1,L2), SBAS, QZSS and L-Band enabled receiver. Proven technology from Novatel
  • Anti-vibration and anti-shock up to 40 G (g-force)
  • Operation temperature: from -40 to 85 degrees C
  • Input voltage: 3.3 VDC
  • Power consumption: 1.3 W
  • Automated logging of raw GNSS
  • Active GNSS antenna: 24g, 51 mm height by 30 mm diameter
  • Customised cables for power, camera and antenna

Post Processing Software (PPK)

 

  • Dedicated, custom developed software for PPK post processing and extracting photo centres from post processed data. The software runs forward and backward processing for smooth and precise results.
  • Software supplied free with hardware.
  • Soon to be integrated into a streamlined cloud photogrammetry processing service.
  • Base station GNSS receiver available if required.

Positioning Accuracy

  • Dependent on distance from base station
  • Camera position accuracy 3cm horizontal and vertical plus 1ppm
  • Similar accuracy acheived in 3D model data
  • Aircraft flight dynamics contribute to absolute camera position accuracy.
  • For orthomosaic generation (2D), no GCPs are required
  • 2 or 3 GCPs are recommended for accurate 3D modelling (to 5cm) to manage camera focal length variations and other gross errors

UAV/Drone

  • Compatible with fixed wing and multirotor UAVs.
  • Inputs to the system are power and camera trigger events (flash signal)
  • Requires power from UAV via splice connector to battery or balance charge connector.
  • PPK box to be installed on UAV so as not to obstruct flight control GPS antennae.
  • Antenna to be mounted directly above center of camera

Manned Aircraft

  • Proven in fixed wing and helicopter mapping operations
  • Integrates with Aviatrix flight control system
  • Powered from internal battery
  • Antenna requires aviation authority approved installation

Cameras

  • Compatible with any COTS DSLR camera with flash hotshoe or PC port
  • Independent of any flight management and camera triggering system
  • Camera events are read via the camera PC port or generic hot-shoe
  • Tags timing of center of exposure to raw GNSS data stream
  • Compatible with most DSLR cameras including Sony, Nikon and Canon

Base Station

  • Process with Rinex data from a known base station
  • Use your own survey grade GNSS receiver or purchase our dedicated base model
  • Process with Rinex data from a nearby CORS station
  • Use satellite broadcast corrections such as Omnistar or Terrastar

Camera integration

  • The PPK system integration is independent of any flight management and aircraft control systems
  • Inputs to the system are power and camera trigger events (flash signal)
  • Camera events are read via the camera PC port or generic hot-shoe
  • The camera triggering pulse at the middle of the exposure time will be synchronized with GPS time to within a 2 millisecond tolerance.
  • The system is compatible with most DSLR cameras including Sony, Nikon and Canon (via PC port on Canon).
  • We will provide calibration flight instructions for calibrating and estimating the camera internal shutter delay to fine tune the synchronization.

Deliverables

  • PPK black box, 110 x 70 x 15 mm, approximately 160 g weight, containing all required connectors for power, active GNSS antenna and camera.
  • A lighter version is also available, weighing under 100g.
  • Software will be provided online.

Payment and Delivery

  • 50% payment is required prior to system build and remainder before delivery.
  • Delivery of the system will be within approximately 4-5 weeks of receiving a purchase order and payment.
  • A camera may be required for integration.

Pricing
Contact us for PPK system price, hardware and software. (Base station is optional extra)

(KLAU-PPK-SYS)

SKU KLAU-PPK-SYS
Brand Klau Geomatics
Shipping Weight 2.0000kg

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