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AWR2944EVM: Cheapest 77GHz single-chip for pedestrian detection while driving?

Part Number: AWR2944EVM
Other Parts Discussed in Thread: AWR2944, AWR1843

Hi, I'm looking for a 77GHz single-chip radar that can detect pedestrians from a moving vehicle. AWR2944 is great but out of stock and too pricey for us. Can AWR1843 handle pedestrian detection? Or is there a cheaper alternative? We're designing a custom PCB so single-chip SoC with free SDK is a must. Any recommendations?