European Facility For Airborne Research

European Facility For Airborne Research May 17, 2022, 06:10

Instrument: UNIMAN Javad AT-4 Differential GPS

Name UNIMAN Javad AT-4 Differential GPS
Acronym Javad-AT4
Manufacturer Javad
Manufacturer website
Operated by UNIMAN
Operated onboard

Instrument type

Name Global Positioning System
Acronym GPS

Principle of operation

Measured parameter Aircraft position, velocity and attitude
Operating principle

Measures distance from at least 4 satellites to calculate aircraft position. Can then be used to calculate aircraft velocities.

Measurement(s) Aircraft Information

Dimension and weight

External dimension Main unit: 110mm x 90mm x 130mm
Weight 1.38


Operating mode In situ






Operational restriction

Operational requirements

Certification approvals

The four GPS antennae are permanent fixtures on the Cessna 182J and required CAA approval.

Additional information

Whilst remaining the same instrument, this unit has been renamed the JNSGyro-4.

Access, host and processing


Could also fit on any aircraft having the following characteristics

General description

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