IEEE - Aerospace and Electronic Systems - September 2021 - 52

Closing the Loop on Cognitive Radar for Spectrum Sharing
Figure 7.
MCR model to select the appropriate CR technique based on real-time observations of radar performance and the EME.
Figure 8.
Implementation architecture of the SDRadar.
convergence to the optimal CR strategy, i.e., one that yields
the best radar performance over time, we develop a sequential
decision process analogous to the multiarmed bandit problem.
By receiving feedback about each algorithm, the goal is to
balance the exploration and exploitation tradeoff. During
an exploration phase, each technique is selected and
radar performance metrics are observed. The exploitation
phase then selects the best technique based on the
expected performances. For instance, in [59], the
" explore-first " approach was used initially, whereby
the MCR engine first sequentially samples CR strategies
to evaluate radar performance before exploiting
the option with the most favorable expected performance
for the remaining decision rounds.
Radar performance evaluation during the explore-first
phase considers a normalized linear combination of SINR
and bandwidth. These metrics allow for simple estimates
that correspond to radar target detectability and range resolution,
respectively. Past work heavily weighted SINR [21],
though the relative weighting ofSINRand bandwidth highly
52
depends on the particular radar application. For example,
those that require tracking of several closely spaced targets
need higher bandwidth to achieve sufficient range resolution.
In contrast, the tracking of distributed moving targets
favors SINR, instead of bandwidth, to mitigate range-bin
migration during a CPI. Prior work in [60] has demonstrated
that short-range moving targets may tradeoffSINRfor bandwidth
while still preserving target detection performance.
TheMCRproposed in [21] also explores how to rearrange
the CR techniques into simpler categories for implementation.
Figure 8 illustrates the toolbox of solutions that are used for
SDRadar. This architecture allows for the combining of different
cognitive methods, waveform types, and radar signal
processing with the tunable matching network. The
" Cognitive Strategy " component uses the fundamental DSA
information from the CR techniques discussed in the section
" Cognitive Radar Techniques for Spectrum Sharing, " which
are here rearranged into the generic categories of fixed, react
(SRA), learn (SLA), and stochastic (SPA). The " Waveform
Type " selection determines whether an LFM or RFM
IEEE A&E SYSTEMS MAGAZINE
SEPTEMBER 2021

IEEE - Aerospace and Electronic Systems - September 2021

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