Interactive multiple model extended Kalman filtering(IMMEKF) algorithm for bearings-only tracking is studied and transfer to the form suitable for hardware implementation. On this basis
an implementation scheme based on FPGA is proposed. Resource optimization and time optimization issues are discussed. Simulation results show that the hardware-based algorithm of IMMEKF can realize bearings-only tracking on single target
and operating time is sharply reduced while guarantee the precision is comparative to software simulation.