Aperture and Receiver Technology. Delivery Order 0002: Bandwidth Invariant Spatial Processing. Volume 2. Digital Signal Processor (DSP) Based Implementation of Direction of Arrival (DOA) for Wideband Sources

摘要

Sensor arrays are used in many digital signal processing applications due to their ability to locate signal sources. For most of these applications, it is necessary to estimate the Direction of Arrival (DOA) of the sources. Numerous algorithms have been developed, but most of them focus on narrowband signals where the time delay can be approximated as a phase shift. This thesis focuses on the coherent signal subspace method for DOA estimation of wideband sources. However, the coherent signal subspace method has high computational requirements that prevented its use in many real-time applications. With the growth in technology, it's now possible to implement these algorithms in real-time embedded systems. These array signal processing algorithms can be implemented in hardware using Digital Signal Processors (DSP), Field Programmable Gate Arrays (FPGA), and Application-Specific Integrated Circuits (ASIC). DSPs offer flexibility and also the best development time and cost with proper use of high-level programming. In this thesis, we propose a DSP based architecture for detecting and estimating the DOA of wideband sources. Also, a parallelized algorithm is presented and its performance is evaluated with respect to the original architecture.