Waveform and Receiver Filter Selection for Wideband Radar Applications
Doktorsavhandling, 2015

This thesis concerns the design of transmitter-receiver chains for wideband radar systems. The transmitter side employs one, or several, highly flexible signal generators, which are able to generate signals with a large bandwidth. At the receiver side, when we are are able to select receiver filters, we have the freedom to optimize also the receiver filters. Herein, the transmit waveforms and receiver filters are designed to fulfil user-defined criteria. In general, a high probability of target detection, while maintaining a low false alarm rate, is desired. For a scenario in which interference is present, this means to achieve a high Signal-to-Interference-and-Noise Ratio. When advanced transmitter-receiver technology is implemented, the possibility to adapt the system through a feedback loop arises. Information about the the radar operating environment is provided by signal processing techniques. We propose a Kalman filter to follow a time-evolving cluttermap, based on the complex received signal samples. The estimates of the complex clutter reflections are utilized to determine parameters of the clutter distribution. The system should, in addition, experience a robust target detection property. This is important when targets are not confined on a user-specified grid of time-delays and time-scalings. We derive an algorithm where the mainlobe width of the correlation function is adapted according to a desired resolution. The thesis also deals with hardware restrictions. A study on how to synthesize time domain signals from achieved power spectra is performed. We synthesize signals with given spectral properties that experience a low peakto- average-power ratio. A signal with constant envelope is also achievable by allowing the power spectrum to deviate somewhat from its desired shape.

interference suppression.

detection

waveform design

receiver filter design

Wideband radar

performance evaluation

EB, Hörsalsvägen 11, Chalmers University of Technology
Opponent: Dr. Margarte Cheney, Department of Mathematics, Colorado State University, USA

Författare

Marie Ström

Chalmers, Signaler och system, Signalbehandling och medicinsk teknik, Signalbehandling

Low PAPR waveform synthesis with application to wideband MIMO radar

Computational Advances in Multi-Sensor Adaptive Processing (CAMSAP), 2011 4th IEEE International Workshop on,; (2011)p. 5-8

Paper i proceeding

Robust transceiver design for wideband MIMO radar utilizing a subarray antenna structure

Signal Processing,; Vol. 93(2013)p. 3541-3552

Artikel i vetenskaplig tidskrift

Ämneskategorier

Signalbehandling

ISBN

978-91-7597-157-5

R - Department of Signals and Systems, Chalmers University of Technology: 3838

EB, Hörsalsvägen 11, Chalmers University of Technology

Opponent: Dr. Margarte Cheney, Department of Mathematics, Colorado State University, USA