Antenna Control Servo System

Antenna Control Servo System

  • At IMTPL, we conceptualize, integrate and deliver hi-tech limited and full motion servo systems for remote sensing, telemetry, data link and TTC communication requirements.
  • We have provided numerous servo systems for Antennas of – 4.6m to 11m dish
  • From 2Ghz (S-band) till 40Ghz (Ka band)
  • Customizable to suit LEO, MEO and GEO satellite tracking
  • Seamless integration for auto tracking based on different feeds
  • Hi-performance servo control using Adaptive control algorithm
  • Customizable UI along with Advanced monitoring and control software


  • Operating Software
  • Servo Motors & Drives, Motion Controls
  • Electrical Panel
  • Proving, Installation and Commissioning
  • Documentation
  • Test and Evaluation (T & E)

Application :

  • ACSS is a high performance Servo System for tracking of Low Earth Orbit Satellites, Geo Synchronous Earth Orbit Satellites, Sun & Stars. ACSS is developed for precise motion control of the parabolic reflector type antennas using the state-of-the-art technology for modern digital control systems. Precise motion control is achieved by backlash removal in large gearboxes used with azimuth & elevation axis of antenna through usage of Dual Drive Counter Torque technique.
  • Implementation of cascade control for closing the loop using signal being received from satellite with the help of high performance servo-motion controls & high resolution absolute encoders.
  • ACSS has different operating modes like Standby, Manual, Slew, Designate, Program Track, Step Track, Monopulse Auto Track, Auto Sequence, Computer Designate Mode, Slave & Stow.
  • We have several installation of ACSS to Space Programs of Satellite Research Organization of India & overseas.


  • For tracking Stable or inclined GEO / MEO / LEO satellites, Launch Vehicles, Sun and Stars
  • S, C, Ku or multiband operation
  • Pointing, Step Track, Orbit Predictive Track, Monopulse systems
  • Fixed or transportable earth stations
  • Accommodates AZ / EL mounts with optional Polarizer
  • Dual servo motor operation for each axis with counter torque for removal of backlash effect
  • Optional timing interfaces – Network Time Protocol or mod code IRIG-B / EIA with count up / count down options
  • Operations in local and remote modes
  • Trajectory generation from NORAD two line elements
  • Trajectory generation from orbital elements
  • Data logging and plotting
  • Usage of Precision Motion Controller
  • High Performance Servo Drives
  • High Resolution Absolute Encoders

Operating Modes:

  • Standby-Brakes are applied and drives are disabled
  • Manual– Axes movements are geared electronically with handwheels
  • Slew-Slewing movements at variable speeds
  • Designate– Axes move to destination angles at required velocities
  • Program Track– Axes move as per the predicted trajectory and timeline
  • Step Track– Axes move in successive small steps to maximize AGC
  • Monopulse Auto Track– Axes are moved so as to make the tracking errors zero
  • Auto Sequence– Automatic changeover from Program track to Monopulse auto track
  • Computer Designate Mode– Axes are moved to follow the angle data continuously being received over the data link
  • Slave– Axes are moved to follow the movement of co-located antenna
  • Stow– Movement of the stow pins is made in this mode