RADAR DEVICE AND DISTANCE AND SPEED MEASUREMENT METHOD

摘要

A radar device including an ADC that performs slide sampling on frequency difference signals outputted from a mixer, and classifies sampling data about the frequency difference signals according to range bins based on a distance resolution corresponding to a pulse width set by a controller, and a speed discrimination unit that separates the sampling data about each range bin after being classified by the ADC according to relative speeds of objects. A distance and speed measurement unit calculates the distance to and the relative speed of an object which has reflected a transmission pulse by using the sampling data after being separated according to relative speeds by the speed discrimination unit.

主权项

1. A radar device comprising:
a pulse setter to set a pulse width and a transmission period of transmission pulses; a pulse transmitter to generate transmission pulses each having the pulse width set by said pulse setter, and repeatedly emit said transmission pulses into space at intervals of the transmission period set by said pulse setter; a pulse receiver to receive, as reflected pulses, transmission pulses which are included in the transmission pulses emitted from said pulse transmitter and each of which is reflected by an object and then returns thereto, and output frequency difference signals respectively showing frequency differences between said reflected pulses and the transmission pulses emitted from said pulse transmitter; a sampler to sample the frequency difference signals outputted from said pulse receiver at intervals of a period longer than the transmission period set by said pulse setter, combine a plurality of sampling results to generate sampling data about said frequency difference signals, and classify the sampling data about said frequency difference signals according to range bins based on a distance resolution corresponding to the pulse width set by said pulse setter; a signal separator to separate sampling data about each of the range bins after being classified by said sampler according to relative speeds of objects; and a distance and speed calculator to calculate a distance to and a relative speed of the object which has reflected said transmission pulse by using sampling data after being separated according to relative speeds by said signal separator.