G4

Polhemus G4

Tetherless Motion Tracker

120Hz
Update Rate
Less than
10ms
Latency
Up to
3
Sensors (Per Hub)
Up to
8
Sources
Man swinging golf club

Freedom of movement

G4™ is a compact, tether-free tracker that allows for uninhibited movement. Harnessing the powerful performance of AC electromagnetics, G4 delivers high-quality 6DOF data via a proprietary RF link back to your computer. With over 10 hours of battery life, imagine the possibilities.

Endless Versatility

Since the system electronics unit (hub) moves with you, there’s no need to remain confined to one space – you can go anywhere! There are several configurations available to scale your tracking area and expand coverage.

Additionally, G4 is compatible with our Standard and Micro Sensors, making it ideal for applications that require smaller sensors for tracking. You can also connect G4 to a 3D digitizing probe and enjoy complete flexibility in your project, perfect for those with large-scale or dynamic environments.

Man using G4 digitizer outside, with a zoom in the right lower corner

HOW IT WORKS

G4 is a portable system that's easy to set up, using a source that emits an electromagnetic field. Finely tuned sensors withing the magnetic field are tracked in full 6 degrees of freedom (6DOF), measuring both position and orientation motion at sub-millimeter accuracy.

Due to the nature of the technology, there is no line-of-sight requirement for continuous tracking. The motion data transports directly to your computer through a proprietary RF link. G4 tracks people and objects through clothes, gloves, and walls, and does not require any special lighting conditions.

EXPAND & EVOLVE

Each G4 hub can track up to three sensors, with an update rate of 120Hz each. The update rate is not impacted by adding additional sensors. Track additional points of interest by increasing the number of hubs (up to nine); expand the tracking range by adding more sources (up to eight).

Since the G4 hub can move freely, users do not have to remain restricted to a set distance determined by the system electronics unit. Instead, users can track motion without any inhibitions – making it the perfect choice for applications that require a dynamic range of motion.

Applications

Golf Swing Analysis

Sports Biomechanics

Virtual Rehabilitation

Training Systems

Virtual Reality Applications

3D Digitizing

Polhemus Motion Tracking Technical Comparisons

Review technical specifications of all Polhemus trackers:

Update Rate
VIPER™
Patriot™
Patriot™ Wireless
Scout™
G4™
Liberty™ Latus™
Fastrak®
240Hz (VIPER 4); 960Hz (VIPER 8 & 16)
60Hz
50Hz
240Hz
120Hz
188Hz (1-8 markers); 94Hz (9-12 markers)
120Hz (divided by number of sensors)
Latency
VIPER™
Patriot™
Patriot™ Wireless
Scout™
G4™
Liberty™ Latus™
Fastrak®
3ms (at 240Hz); 2ms (at 480Hz); 1ms (at 960Hz)
18.5ms
20ms
3.5ms (filters off); approx 7ms (dynamic filters on)
10ms
5ms
4ms
Operating Temperature (minimum to maximum)
VIPER™
Patriot™
Patriot™ Wireless
Scout™
G4™
Liberty™ Latus™
Fastrak®
10°C to 40°C
10°C to 40°C
10°C to 40°C
-20°C to 50°C (Sensor); -40°C to 70°C (Source)
10°C to 40°C
0°C to 50°C
10°C to 40°C
Operating Voltage
VIPER™
Patriot™
Patriot™ Wireless
Scout™
G4™
Liberty™ Latus™
Fastrak®
100-240 VAC 50-60Hz
100-240 VAC 50-60Hz
100-240 VAC 50-60Hz
Sensor: 5VDC, 200MA (regulated); Canopy Source: 7 to 36 VDC (1 watt); Standard Source: 7 to 36 VDC (4 watt)
Source: 100-240 VAC; 50/60Hz; RF Dongle: USB powered 5 volt; 30 ma; Hub: internal rechargeable battery included
100-240 VAC 50-60Hz
100-240 VAC 47-63Hz
Software Tools
VIPER™
Patriot™
Patriot™ Wireless
Scout™
G4™
Liberty™ Latus™
Fastrak®
Microsoft Windows®10 GUI; Unity: Sample open source code included; Linux: Sample open source code included
Microsoft Windows® GUI/Linux® GUI
Microsoft Windows® GUI
Microsoft Windows® GUI/Linux® GUI/Full Linux Support
Microsoft Windows® GUI/Linux® GUI
Microsoft Windows® GUI/Linux® GUI
Interface
VIPER™
Patriot™
Patriot™ Wireless
Scout™
G4™
Liberty™ Latus™
Fastrak®
USB or RS-422 (both included); dual output available
RS-232 or USB 2.0 (both included)
RS-232 or USB 2.0 (both included)
RS-422
Proprietary RF link
RS-232 or USB 2.0 (both included)
RS-232 or USB 2.0 (both included)
Number of Sensors
VIPER™
Patriot™
Patriot™ Wireless
Scout™
G4™
Liberty™ Latus™
Fastrak®
1-16 sensors
1-2 sensors
1-4 wireless markers
1 sensor
3 sensors (per hub)
1-12 wireless markers
1-4 sensors
Static Accuracy - Position
VIPER™
Patriot™
Patriot™ Wireless
Scout™
G4™
Liberty™ Latus™
Fastrak®
0.015 inches RMS (0.38mm)
0.06 inches RMS (1.52mm)
0.30 inches RMS (7.62mm)
0.03 inches RMS (0.8mm)
0.08 inches RMS (2.0mm)
0.10 inches RMS (2.54mm)
0.03 inches RMS (0.76mm)
Static Accuracy - Orientation
VIPER™
Patriot™
Patriot™ Wireless
Scout™
G4™
Liberty™ Latus™
Fastrak®
0.10° RMS
0.40° RMS
1.0° RMS
0.18° RMS
0.50° RMS
0.50° RMS
0.15° RMS