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Author

E. Noges

Bio: E. Noges is an academic researcher. The author has an hindex of 1, co-authored 1 publications receiving 4 citations.

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Book ChapterDOI
01 Jan 2003
TL;DR: In this paper, the authors investigate some systems with Lebesgue sampling and show that it gives better performance than Riemann sampling in the analysis of simple systems, and they also show that LBSs are much harder to analyze than RMSs, because the time varying nature of the closed loop system can not be avoided.
Abstract: Sampling is normally done periodically in time. For linear time invariant systems this leads to closed loop systems that linear and periodic. Many properties can be investigated by considering the behavior of the systems at times that are synchronized with the sampling instants. This leads to drastic simplifications because the systems can be described by difference equations with constant coefficients. This is the standard approach used today when designing digital controllers. Using an analog from integration theory, periodic sampling can also be called Riemann sampling. Lebesgue sampling or event based sampling, is an alternative to Riemann sampling, it means that signals are sampled only when measurements pass certain limits. This type of sampling is natural when using many digital sensors such as encoders. Systems with Lebesgue sampling are much harder to analyze than systems with Riemann sampling, because the time varying nature of the closed loop system can not be avoided. In this paper we investigate some systems with Lebesgue sampling. Analysis of simple systems shows that Lebesgue sampling gives better performance than Riemann sampling.

48 citations

Journal ArticleDOI
TL;DR: In this paper, a pulse modulation scheme based on two modulation curves is proposed for applications in spacecraft attitude control using thrusters which may be subject to switching restrictions, and these constraints are taken into account explicitly during the design of the modulation scheme which can implement arbitrary bounded functions between constant modulator input and averaged modulator output.

21 citations

Proceedings ArticleDOI
01 Aug 2014
TL;DR: In this paper, the impact of pulse jet impulse, pulse jet ignition waiting time and gravity on the guidance loop is obtained via analyzing phase trajectory of TCMP position deviation, and the quantitative relationship between pulse jet firing waiting angle and roll angle measurement error is derived under gravity compensation.
Abstract: Trajectory sag due to gravity and demodulation error caused by roll angle measurement error are the main factors that influence the guidance precision of Terminal Correction Mortar Projectile (following called TCMP for short) using pulse jets. TCMP dynamics model and guidance loop model are established, and then the impact of pulse jet impulse, pulse jet ignition waiting time and gravity on the guidance loop is obtained via analyzing phase trajectory of TCMP position deviation. According to the discrete control characteristics of impulse force, we propose bias threshold method for gravity compensation. The quantitative relationship between pulse jet firing waiting angle and roll angle measurement error is derived under gravity compensation. Moreover, roll coupling guidance loop simulation model of TCMP is established, and then the model is simulated under different waiting angle demodulation error. Simulation results show that TCMP has a certain tolerance to roll angle measurement error.

3 citations

01 Jan 2005
TL;DR: In this article, a pulse modulation scheme based on two modulation curves is proposed for applications in spacecraft attitude control using thrusters which may be subject to switching restrictions, and these constraints are taken into account explicitly during the design of the modulation scheme which can implement arbitrary bounded functions between constant modulator input and averaged modulator output.
Abstract: A pulse modulation scheme based on two modulation curves is proposed for applications in spacecraft attitude control using thrusters which may be subject to switching restrictions. These constraints are taken into account explicitly during the design of the modulation scheme which can implement arbitrary bounded functions between constant modulator input and averaged modulator output.

2 citations