CoDyPower LLC


Radio/Optical Telescope Control





Green Bank Telescope (GBT), WV, USA



Giant Meterwave Radio Telescope (GMRT), Pune, India

CoDyPower offers a strong team of dedicated professionals with an average of 30 years of experience in the design of advanced control solutions and the instrumentation, implementation and maintenance of servo-systems for large radio telescopes.

Large radio and optical telescopes are pushing the limits of engineering design. As new astronomical challenges demand much higher resolution and greater performance specifications, the size and complexity of telescopes are becoming extraordinary.

New extra-large radio telescopes with antennas over 100-meter diameter, and optical telescopes with apertures over 10-meter diameter, need enormous mechanical structures and multi-motor servo actuators that challenge the control systems in new ways, including:
- Lower frequency modes
- More significant gravity effects
- Higher sensitivity to wind disturbances and temperature changes
- Interaction of multiple motors
- Nonlinear characteristics and model uncertainty.

The reliability, high-performance and expected life of these large telescopes strongly depend on the applied control strategy, which have to consider multiple aspects in the design, including:
- Load reduction
- Mechanical fatigue minimization
- High reliability
- Maximum availability
- Performance optimization
- Wind disturbance rejection
- Coordination of multi-motor platforms.


Support Packages

CoDyPower offers the packages listed below for servo-systems of radio and optical telescopes. The customer can request one of these packages or a customized combination of them.

P1: Servo-system diagnostics
To quantify current health of the servo-systems, to find potential room for performance improvement, and to identify potential problems that can affect the expected life of the telescope.

P2: Dynamics modeling
To understand the dominant dynamics and frequency response of the telescope with respect to the azimuth-axis, elevation-axis or other degrees of freedom.

P3: Experimental system identification
To develop and tune an experimental dynamic model of the telescope for control purposes.

P4: Classical PID, Lead-Lag control tuning
To fine-tune the coefficients of the classical PID and Lead-Lag control solutions of the servo-systems of the telescope. Click here.

P5: Advanced QFT robust control
To design an advanced control solution for the servo-systems, including model uncertainty and multi-objective specifications like reliability, mechanical fatigue reduction, high-performance, reference tracking precision and wind disturbance rejection. Click here.

P6: Advanced nonlinear switching robust control
For very high-performance specifications, going beyond the linear limitations of the classical control design. Click here.

P7: Instrumentation for Servo and Structural Monitoring
Sensors, data acquisition systems, hardware and software solutions. Includes definition of instrumentation requirements, selection of appropriate solutions and support on the implementation.

P8: Servo-systems maintenance and support
Development of specific maintenance programs for the telescope. Also, we provide optional levels of technical support.

P9: Training you to understand your servo-systems
We train your practicing engineers on the design and maintenance of your servo-systems, with special emphasis on understanding monitored data and control loop performance.

P10: Courses on applied control of servo-systems
We offer intensive courses on advanced/applied control for servo-systems using our QFT control toolbox for Matlab. Click here.

P11: Special projects
For advanced solutions, research projects and customized cases.


Request for additional information
Those interested in a preliminary discussion about the above packages, please email: info@codypower.com


Selection of publications

[1]. Garcia-Sanz,Mario (2016). High-performance robust control solutions for advanced radio/optical telescopes. Kenote talk. Metrology and Control of Large Telescopes Conference, Green Bank, West Virginia, USA. September 19-23, 2016.

[2]. Ranka,T., Garcia-Sanz,M., Symmes,A., Ford,J., Weadon,T. (2016). Dynamic analysis of the Green Bank Telescope structure and servo system. Journal of Astronomical Telescopes, Instruments and Systems, 2(1), 014001. DOI: 10.1117/1.JATIS.2.1.014001.

[3]. Franke,T., Weadon,T., Ford,J., Garcia-Sanz,M., (2015). Correcting Encoder Interpolation Error on the Green Bank Telescope Using an Iterative Model-Based Identification Algorithm. Journal of Astronomical Telescopes, Instruments and Systems, 1(4), 044005-2015. DOI: 10.1117/1.JATIS.1.4.044005.

[4]. Ranka,T., Garcia-Sanz,M., Ford,J. (2015). Extended state observer based controller design for the Green Bank Telescope servo system. Columbus, Ohio: ASME 2015 Dynamical Systems and Control Conference.

[5]. Ranka,T., Garcia-Sanz,M., Weadon,T., Ford,J. (2014). System identification of The Green Bank Telescope structure and servo system. Portland, Oregon: American Control Conference, ACC-2014. (Best presentation in session award).

[6]. Ranka,T., Garcia-Sanz,M., Weadon,T., Ford,J. (2014). System Identification and Interval Analysis of the Green Bank Telescope structure and servo system. Montreal, Quebec: 2014 SPIE Astronomical Telescopes and Instrumentation Conference, SPIE, Ground-based and Airborne Telescopes V.

[7]. Lounsbury,W., Garcia-Sanz,M. (2014). High-Performance Quantitative Robust Switching Control for Optical Telescopes. Montreal, Quebec: 2014 SPIE Astronomical Telescopes and Instrumentation Conference, SPIE, Software and Cyberinfrastructure for Astronomy III.

[8]. Franke,T., Weadon,T., Ford,J., Garcia-Sanz,M. (2014). An Iterative Model-Based Cogging Compensator for the Green Bank Telescope Servo System. Montreal, Quebec: 2014 SPIE Astronomical Telescopes and Instrumentation Conference, SPIE, Ground-based and Airborne Telescopes V.

[9]. Garcia-Sanz,M., Franke,T., Ranka,T., Adams,M.L., Adams,M., Ford,J., Weadon,T., McCullough,R., Ray,J. (2013). Advanced control solutions to extend the operational frequencies of the Green Bank Radio Telescope: from control theory to experimental validation. CWRU ShowCase, Cleveland, Ohio, USA.

[10]. Garcia-Sanz,M., Ranka,T., Joshi,B.C. (2012). High-performance switching QFT control for large radio telescopes with saturation constraints. 64th National Aerospace & Electronics Conference, IEEE-NAECON, Dayton, Ohio, USA.

[11]. Garcia-Sanz,M., Ranka,T., Joshi,B.C. (2011). Advanced nonlinear robust controller design for high-performance servo-systems in large radar antennas. 63th National Aerospace & Electronics Conference, IEEE-NAECON, Dayton, Ohio, USA.


Located in Ohio, CoDyPower is a Control, Dynamics and Power engineering company. © Copyright CoDyPower LLC, Ohio 44022, U.S.A. info@codypower.com