# Agenda

## Signal Processing Seminar

- Thursday, 19 October 2017
- 13:30-14:30
- HB 17.150

### Blind calibration of radio astronomical phased arrays

**Stefan Wijnholds**

*ASTRON*

Radio astronomical phased arrays are usually calibrated under the assumption that the observed scene is known. That assumption may not hold if a new frequency window is opened (for example in the case of the currently planned antenna arrays in space observing below 10 MHz) or when there are unexpected source signals such as transients or radio frequency interference (RFI). In this talk, I present recent work on blind calibration of radio astronomical phased assuming that the observed scene is sparse. The resulting method applies sparse reconstruction techniques to the measured array covariance matrices instead of time series data. I discuss the computation speed-up provided by this shift from signal domain to power domain and explain how phase transition diagrams need to be reinterpreted in this contextÂ

Additional information ...### Agenda

- Thu, 19 Oct 2017
- 13:30
- HB 17.150

### Signal Processing Seminar

#### Stefan Wijnholds

#### Blind calibration of radio astronomical phased arrays

Using sparse reconstruction to access scenes without known calibrator sources

- Tue, 24 Oct 2017
- 10:00
- Aula Senaatszaal

### PhD Thesis Defence

#### Yongchang Hu

#### Signal Strength Based Localization and Path-Loss Exponent Self-Estimation in Wireless Networks

Receiver signal strength is easily observed. How can we do accurate localization based on this?

- Wed, 25 Oct 2017
- 10:00
- Van der Poel-zaal (EWI LB01.220)

### MSc BME thesis presentation

#### Insani Abdi Bangsa

#### System Building Blocks for Mathematical Operators Using Stochastic Resonance -- Application in an Action Potential Detection System

MSc thesis presentation on Stochastic Resonance Systems for Biomedical Applications