Patent ID: 9110152
Filing Date: 2015-08-18
Classification: G01S

Abstract:
1. A method of determining a peak detecting threshold which is used by a frequency modulated continuous wave FMCW radar, the method comprising: detecting a peak frequency component which appears as representing a target object in a frequency spectrum derived by frequency-analyzing a first beat signal that is a beat signal developed by a FMCW radar wave transmitted from a transmitter of the FMCW radar and a reflection of the FMCW radar wave from the target object received by a receiver of the FMCW radar using a processor, wherein the FMCW radar wave is a frequency modulated continuous wave that has a varying frequency; producing a second beat signal that is a beat signal created by transmitting a CW radar wave through the transmitter of the FMCW radar and receiving a reflection of the CW radar wave using the receiver of the FMCW radar, wherein the CW radar wave is a continuous wave that has a fixed frequency and is different from the FMCW radar wave; frequency-analyzing, using the processor, the second beat signal to create a frequency spectrum as a CW noise spectrum and defining, as a CW upper limit component, a peak frequency component which appears in the CW noise spectrum and arises from the reflection of the CW radar wave from an object having a predetermined upper limit of a relative speed to the radar; adding an offset, using the processor, to frequency components in a high-frequency region of the CW noise spectrum which is higher than the CW upper limit component to define a first distribution; and determining, using the processor, the first distribution as a value of the peak detecting threshold.