In this paper a two-phase supply modulator suitable for envelope tracking power amplifier is presented. The designed supply modulator has the linear assisted switching architecture. Two-phase architecture is used in order to reduce the output switching ripples. The proposed architecture uses hysteretic control instead of pulse width modulation (PWM) which significantly reduces the circuit compl...

This paper investigates three different Kalman filter implementation options to estimate signal tracking errors in a GPS receiver with particular emphasis given to the carrier phase. The three options are outlined in terms of the system and measurement models. Initial assessment of the different options is performed in scalar-tracking mode with strong signals to assess their relative carrier ph...

In this paper we study the problem of tracking a reference signal from the H" point, of view. As opposed to general Woo problems, whcrc only suboptimal solutions are obtained, wc show that for both the full information arid measurement, feedback tracking problems the H""-optimal solutions can be explicitly found. The results also indicate an interesting dichotomy between minimum phase and non-m...

This article presents a method of signal timescale modification using spectral analysis-resynthesis. It discusses an alternative technique for instantaneous frequency estimation, the Instantaneous Frequency Distribution (IFD). The partial tracking analysis employed in this process is explained in some detail, followed by a look into the resynthesis method. The article discusses this technique o...

In this paper we study the problem of tracking a reference signal from the H 1 point of view. As opposed to general H 1 problems, where only suboptimal solutions are obtained, we show that for both the full information and measurement feedback tracking problems the H 1-optimal solutions can be explicitly found. The results also indicate an interesting dichotomy between minimum phase and non-min...

Object tracking is an important task for active vision and robotics. This paper presents a 3D feature-based tracker for tracking multiple moving objects with a computer-controlled binocular head. Our tracker operates in two phases: an initialization phase and a tracking phase. In the initial-ization phase, correspondence between 2D features in the first stereo image pair is determined reliably ...

a novel technique is investigated for pid controller adaptation in order to control thetemperature of a liquid-phase reactor tank by using a heat exchanger system. as for nonlinearity,time delay problems and model uncertainties introduced by the heat exchanger, an interval type-2fuzzy system (it2fs) is implemented to enhance and improve the total control performance.moreover, the fuzzy inferenc...

In phase-resolved OCT angiography blood flow is detected from phase changes in between A-scans that are obtained from the same location. In ophthalmology, this technique is vulnerable to eye motion. We address this problem by combining inter-B-scan phase-resolved OCT angiography with real-time eye tracking. A tracking scanning laser ophthalmoscope (TSLO) at 840 nm provided eye tracking function...

Non-minimum phase (NMP) model is a discrete-time model obtained from small or reducing sampling-time of open-loop input and output experimental data. The classical feed-forward controller design of this model using inverse of the closed-loop transfer function would produce an unstable tracking control. This is due to phase and gain errors that caused by NMP zero. Thus, zero phase error tracking...