Patent ID: 9709665
Date: 2017-07-18
CPC Classifications: G01S

Claim:
1. A radar apparatus capable of extracting peak signals obtained from a difference frequency between a transmitting signal of which a frequency is changed in a predetermined cycle and a receiving signal obtained by receiving a reflection wave of a transmission wave based on the transmitting signal at a target, for a first period at which the frequency of the transmitting signal ascends and for a second period at which the frequency descends, and deriving information about the target based on the extracted peak signals, the radar apparatus comprising: a predicting unit configured to predict a first current peak signal based on a previously-determined peak signal; an extracting unit configured to extract a second current peak signal corresponding to the predicted first current peak signal, from among peak signals existing within a predetermined range of the frequency; and a filtering unit configured to perform a filtering process on the predicted first current peak signal and the extracted second current peak signal, and output a result of the filtering process as a current determined peak signal, wherein, if the target derived based on the extracted second current peak signal is a preceding vehicle existing in front of an own vehicle equipped with the radar apparatus, the filtering unit judges whether to perform the filtering process according to a state of the preceding vehicle, and wherein, if the state of the preceding vehicle is changed from a stop state to a start state, the filtering unit outputs the extracted second current peak signal as the current determined peak signal without performing the filtering process.