Abstract:Radar networks offer the opportunity of enhancing the radar sensing performance beyond the inherent limitations of single multiple-input multiple-output (MIMO) radars. Different locations of the individual sensor nodes allow for diverse observation angles on the targets. Moreover, in case of a coherent network, such as radar-repeater networks, the direction of arrival (DoA) capabilities are increased. However, a crucial point in exploiting the full potential of a sensor network is the separability of the signa… Show more
“…A drawback of this multiplexing strategy is that the unambiguous range is reduced by the factor n Tx . However, in [29], other multiplexing techniques with a lower reduction of unambiguous range are presented for symmetric-path radar-repeater networks, which could also be adapted for the MCR network proposed here.…”
Coherent radar networks allow for spanning very large apertures that include all sensors with their subapertures in the network, resulting in very good angular resolution. However, as a radar network typically has a sparse array, its performance depends on the flexibility of the antenna and network node placement. Thus, in this work, a new type of radar network is presented, allowing for a highly flexible network and array design and providing an excellent performance in direction-of-arrival (DoA) estimation. This is reached by using multichannel repeaters (MCRs) in combination with a single multiple-input multipleoutput (MIMO) radar. The MCRs receives the radar's signal via a line-of-sight path, and then re-transmits it via multiple transmit channels, each with a dedicated mixer used for multiplexing. To show the feasibility and the performance of this concept, a 77-GHz radar network consisting of a digital 4 × 4 MIMO radar and two four-channel MCRs is presented. It is designed following network array design recommendations mathematically derived in this work and combined with an adapted signal processing and network-based DoA estimation. The high performance of the system is demonstrated not only via systematic measurements in an anechoic chamber, but also in various automotive scenarios including multiple road users.
“…A drawback of this multiplexing strategy is that the unambiguous range is reduced by the factor n Tx . However, in [29], other multiplexing techniques with a lower reduction of unambiguous range are presented for symmetric-path radar-repeater networks, which could also be adapted for the MCR network proposed here.…”
Coherent radar networks allow for spanning very large apertures that include all sensors with their subapertures in the network, resulting in very good angular resolution. However, as a radar network typically has a sparse array, its performance depends on the flexibility of the antenna and network node placement. Thus, in this work, a new type of radar network is presented, allowing for a highly flexible network and array design and providing an excellent performance in direction-of-arrival (DoA) estimation. This is reached by using multichannel repeaters (MCRs) in combination with a single multiple-input multipleoutput (MIMO) radar. The MCRs receives the radar's signal via a line-of-sight path, and then re-transmits it via multiple transmit channels, each with a dedicated mixer used for multiplexing. To show the feasibility and the performance of this concept, a 77-GHz radar network consisting of a digital 4 × 4 MIMO radar and two four-channel MCRs is presented. It is designed following network array design recommendations mathematically derived in this work and combined with an adapted signal processing and network-based DoA estimation. The high performance of the system is demonstrated not only via systematic measurements in an anechoic chamber, but also in various automotive scenarios including multiple road users.
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