Cognitive Antenna Selection for Automotive Radar Using Bobrovsky-Zakai Bound

Research output: Contribution to journalArticlepeer-review

Abstract

Automotive imaging radars require high angular resolution which can be achieved by a large antenna aperture. In order to obey Nyquist spatial sampling rate, a large number of array elements and receive channels is required. In practice, this solution results in a prohibitively high cost and complexity. This work proposes a new cognitive receiver configuration, in which a large number of sensor array elements is connected to a small number of receive channels via a switching matrix. The state of the switching matrix is sequentially updated using information from previous observations and prior information. According to the proposed scheme, denoted as cognitive antenna selection (CASE), the state of the switching matrix is obtained by the minimization of conditional Bayesian bounds on the mean-squared-error of the direction-of-arrival estimate. We show that the Bayesian Cramér-Rao bound (BCRB) is an inappropriate optimization criterion since it ignores the effect of ambiguity. This work proposes the Bobrovski-Zakai bound (BZB), which accounts for the effect of ambiguity, as a criterion for cognitive antenna selection. The performance of the proposed CASE-BZB approach is evaluated via simulations in single and multiple target scenarios. It is shown that the CASE-BZB outperforms random and linear switching algorithms both asymptotically and in the threshold region.

Original languageEnglish
Article number9398546
Pages (from-to)892-903
Number of pages12
JournalIEEE Journal on Selected Topics in Signal Processing
Volume15
Issue number4
DOIs
StatePublished - 1 Jun 2021

Keywords

  • Antenna selection
  • Bobrovsky-Zakai bound
  • automotive radar
  • cognitive DOA estimation
  • cognitive radar

ASJC Scopus subject areas

  • Signal Processing
  • Electrical and Electronic Engineering

Fingerprint

Dive into the research topics of 'Cognitive Antenna Selection for Automotive Radar Using Bobrovsky-Zakai Bound'. Together they form a unique fingerprint.

Cite this