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- P. Wirfält, G. Bouleux, M. Jansson, P. Stoica
- 2012

In certain applications involving direction of arrival (DOA) estimation the operator may have a-priori information on some of the DOAs. This information could refer to a target known to be present at a certain position or to a reflection. In this study, the authors investigate a methodology for array processing that exploits the information on the known… (More)

- Dave Zachariah, Petter Wirfält, Magnus Jansson, Saikat Chatterjee
- Signal Processing
- 2013

—For line spectrum estimation, we derive the maximum a posteriori probability estimator where prior knowledge of frequencies is modeled probabilistically. Since the spectrum is periodic, an appropriate distribution is the circular von Mises distribution that can parameterize the entire range of prior certainty of the frequencies. An efficient alternating… (More)

- Petter Wirfält, Magnus Jansson, Guillaume Bouleux, Petre Stoica
- 2011 IEEE International Conference on Acoustics…
- 2011

In a number of direction of arrival (DOA) estimation applications there exists prior knowledge about the sources whose bearings are to be determined. We study the case when this prior information concerns some of the source positions and their correlation state, which is a relevant case in, for example, RADAR scenarios where stationary objects exists in the… (More)

- Petter Wirfält, Magnus Jansson
- 2012 IEEE Statistical Signal Processing Workshop…
- 2012

In certain Direction of Arrival (DOA) scenarios some of the sources are approximately known a priori. It is then desirable to be able to exploit this prior knowledge when estimating the DOAs of the unknown sources. In this paper we modify an estimator utilizing exact angular prior knowledge of some sources such that the estimator is able to exploit prior… (More)

- Petter Wirfält, Magnus Jansson, Guillaume Bouleux
- 2013 IEEE International Conference on Acoustics…
- 2013

In certain direction-of-arrival (DOA) estimation scenarios some of the source directions are known to the operator even before measurements are acquired. It is then undesirable to use regular DOA-algorithms which waste data-samples estimating the known directions. Additionally, in some applications it is known that the signals emanating from the known… (More)

- Erik Gudmundson, Petter Wirfält, Andreas Jakobsson, Magnus Jansson
- 2012 IEEE Statistical Signal Processing Workshop…
- 2012

The pulse spin-locking sequence is a common excitation sequence for magnetic resonance and nuclear quadrupole resonance signals, with the resulting measurement data being well modeled as a train of exponentially damped sinusoidals. In this paper, we derive an ESPRIT-based estimator for such signals, together with the corresponding Cramér-Rao lower… (More)

- Petter Wirfält, Magnus Jansson
- IEEE Transactions on Signal Processing
- 2014

The estimation of covariance matrices is an integral part of numerous signal processing applications. In many scenarios, there exists prior knowledge on the structure of the true covariance matrix; e.g., it might be known that the matrix is Toeplitz in addition to Hermitian. Given the available data and such prior structural knowledge, estimates using the… (More)

- Petter Wirfält, Magnus Jansson
- Signal Processing
- 2015

In this article, we investigate the performance of the recently proposed Direction-Of-Arrival (DOA) estimator POWDER (Prior Orthogonally Weighted Direction Estima-toR). The method is exploiting a specific form of prior information, namely that some DOAs are known, as well as that the correlation state between some of the source signals are known. In such… (More)

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