In this paper, we present a physical-layer cyberattack resilient OFDM radar design for automotive applications. A typical FMCW radar system sends multiple chirp signals in a coherent processing interval, whereas an OFDM radar sends multiple OFDM frames [1]. OFDM radar approach has a potential advantage for automotive applications, which is the use same RF hardware and bandwidth for both AV radar and V2V/V2X communication [2]. Cyberattack resilience of FMCW radars has been studied in [3], [4], [5], [6], in this paper we address the same problem for OFDM radars, propose a new radar algorithm called OFDM-i, and a cyberattack detector D1. The proposed idea is based on selecting a fixed percentage of subcarriers as null, and changing these null bands randomly for each frame. To minimize the impact of this on range resolution, we also require no more than two neighboring null bands in each frame. We demonstrate the performance of OFDM-i both by using simulations, and then using real data obtained from a National Instruments 39 GHz mmwave system. We also provide an upper bound for the false cyberattack alarm rate, study the resilience of the proposed system using a combinatorial analysis, and then using simulated attacks. Finally, we summarize possible future research directions.
Physical-layer Cyberattack Resilient OFDM Automotive Radars
2020-12-16
262009 byte
Conference paper
Electronic Resource
English
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