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Photo-Sonics Nano-Sextant
Tracking System

 

Nano Sextant Tracking System

Light weight - This is a light-weight portable tracking system weighing 140 pounds. It can be hard-mounted on a stable platform for high dynamic performance and accuracy. It can also be mounted on a tripod for less stringent requirements.

High performance - The Nano-Sextant is designed with more power than is typically offered for this sized tracking system to ensure excellent dynamic performance. It incorporates a 25 ft/ pound torque motor in azimuth and another 25 ft/pound torque motor for elevation. These motors enable 120°/sec2 acceleration with a nominal payload of 225 pounds providing high bandwidth for excellent tracking performance.

Versatile payload configuration - The payload can be mounted directly to the vertical side plates of the mount or to horizontal payload platforms. The horizontal payload platforms are removable for transport.


Pedestal rotation
- The pedestal is designed to allow rotation of 270° in each direction from the centre position. The elevation axis has -30° to +210° of travel to be able to turn and dump (30° look down).

Servo System - The Nano-Sextant digital servo system consists of a digital amplifier with position feedback, digital notch filter, and power module. The servo system can be located up to 75 feet away from the pedestal.

Encoder System - 21-bit or 23-bit Inductosyn® encoders.

Photo-Sonics’ Argus Digital Control System - The Argus Instrument Control and Auto Tracker is implemented on the Nano-Sextant with a Photo-Sonics designed servo amplifier, a control console, and a QNX controller. The basic system includes a touch screen display, stick controller, and keyboard in a mobile electronics package. The controller unit can be configured for IRIG/GPS, with an auto-tracker, and can include interfaces to video or digital recording systems.

Pedestal Specifications

System accuracy with payload after calibration

± 10 arc seconds*

Bearings

14.75” diameter azimuth thrust bearing
7.5” diameter elevation ball bearing

Drive System

Direct drive DC torque motors (brush type)

Torque

AZ – 25 foot pounds
EL – 25 foot pounds

Velocity (with 225 pound payload)

AZ – 120°/second (21-bit mode)
45°/second (23-bit mode)
EL – 120°/second (21-bit mode)
45°/second (23-bit mode)

Acceleration (with 225 pound payload)

AZ – 120° sec²*
EL – 120° sec²*

Bandwidth @ +3dB
(no payload)

AZ – 18 Hertz*
EL – 25 Hertz*

Nominal Payload

225 pounds

Bearing accuracy (measured optically)

AZ - ± 5 arc seconds
EL - ± 5 arc seconds

Orthogonality

± 5 arc seconds

Encoders (Inductosyn®)

AZ and EL- 21-bit or 23-bit

Elevation Travel
Azimuth Travel

-30° to +210° (from horizontal)
270° (each direction from center)

Transit Locks

Locking stow pins in AZ and EL

Weight (with no payload)

140 pounds*

Height

20”

*Specifications subject to change

Data Sheet


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  Registered in England Number 2590014. Registered Office: 5 Thame Park Business Centre, Wenman Road, THAME, Oxfordshire, OX9 3FR UK
 Last updated: 27/06/2008           Telephone +44 (0)1844 260600 Fax +44 (0)1844 260126 
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