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UAV Sensors and Components

GEM GSMP-35U: Ultra Light-Weight Potassium Magnetometer


GEM System’s GSMP-35U is at the core of our UAV offerings

GEM Systems developed the GSMP-35U to be the first light-weight, high sensitivity magnetometer specifically designed for UAVs. It has been installed and successfully tested on the Monarch Fixed-Wing Gradiometer, the GEM Copter Multi-Rotor UAV and the GEM Hawk Helicopter UAV. At a weight of less than 1 kg, this Ultra Light-Weight Sensor opens up new avenues for magnetometer surveys.

The sensors are based on GEM’s popular optically pumped Potassium Magnetometer sensor, which offers the highest sensitivity, absolute accuracy and gradient tolerance available in the industry. The 0.3 pT sensitivity potassium magnetometer forms the core of GEM’s UAV solutions.

The sensors stream RS-232 or RS-485 data which can be visualized for quality control purposes, if hardware is on board to facilitate a down link of data. The GSMP-35U magnetometer is also supplied complete with 128 Mb of on board data storage, suitable for long flights.

The GSMP-35U offers high quality data at the highest sampling rate of up to 20 readings per second. It can be slung alone by a UAV or integrated into any UAV
system such as our towed UAV AirBIRD and GradBIRD.

The GSMP-35U UAV Magnetometer includes:

  • GSMP-35U High Sensitivity Magnetometer with 2 m Cable: 161mm x 64mm external diameter (0.55 kg)
  • GSMP-35U Electronics Box: 236mm x 56mm x 39mm (0.45 kg).
  • GEMLink+ software for File Transfer, Diurnal Correction, Profiling and Basic Mapping & Modeling
  • Total Weight: 1.0 kg

Magnetometer Specifications

  • Sensitivity: 0.0002 nT @ 1 Hz
  • Resolution: 0.0001 nT
  • Absolute Accuracy: +/- 0.1 nT
  • Heading Error: + / – 0.05 nT
  • Dynamic Range: 15,000 to 120,000 nT
  • Gradient Tolerance: 50,000 nT/m
  • Sampling Intervals: 1, 2, 5, 10, 20 Hz
  • Operating Temperature: -40°C to +55°C

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GEM GSMP-35UP: Sensor with Pixhawk Integration


GEM System’s GSMP-35UP provides ready to go Pixhawk Integration for our UAV magnetometer. Note that Pixhawk and GPS shown here are not included.

This option includes the light-weight GSMP-35U modified to facilitate recording the rich data stream from the Pixhawk autopilot found in so many UAVs. A full, multi-parameter database, which includes the mag data and all of the UAV’s sensor data, such as altimeter and GPS is created on-board the magnetometer’s custom electronics module. Data is retrieved post flight.

The GSMP-35UP Sensor for Pixhawk Integration includes:

  • Light Weight Potassium Magnetometer GEM GSMP-35U
  • GEMDAS Data acquisition Module
  • Cable for PixHawk integration
  • GEMLink+ software for File Transfer, Diurnal Correction, Profiling and Basic Mapping & Modeling
  • Note: Pixhawk and GPS units are not included

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GEM GSMP-35UC: Sensor with Components Integration


GEM System’s GSMP-35UC inlcudes one High Sensitivity Potassium Sensor plus Integration of Essential Flight Components into UAV systems.

GEM will supply and integrate GPS, laser altimeter, IMU and data radio-link. The system runs completely independent of the on-board autopilot. The electronics box for the magnetometer system is modified to include a multiplexor (GEMDAS) to handle data acquisition and storage for a variety of parameters. The data can be retrieved at the end of the flight or it can be delivered in real-time to the ground via radio link. A separate Digital Acquisition System can also be provided.

The GSMP-35UC Sensor and Components Integration includes:

  • Light Weight Potassium Magnetometer GEM GSMP-35U
  • GEMDAS Data acquisition Module
  • Laser Altimeter
  • IMU
  • GPS 0.7m resolution
  • GEMLink+ software for File Transfer, Diurnal Correction, Profiling and Basic Mapping & Modeling
  • Total Weight: < 2.0 kg

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