Radar device and method for adjusting among radar sites

Abstract

A radar device includes a generation unit, a transmission unit, and a control unit. The generation unit selectively generates a set of a plurality of transmission signals whose center frequencies are different from one another within an assigned frequency band. The transmission unit emits the transmission signals. The control unit controls the generation unit so as to vary the center frequencies for each emission of the transmission signals.

1 . A radar device comprising: 
 a generation unit which selectively generates a set of a plurality of transmission signals whose center frequencies are different from one another within an assigned frequency band;    a transmission unit which emits the transmission signals; and    a control unit which controls the generation unit so as to vary the center frequencies for each emission of the transmission signals.    
   
   
       2 . A radar device comprising: 
 a generation unit which selectively generates transmission signals in a plurality of types of pulse widths or modulation methods;    a transmission unit which emits the transmission signals; and    a control unit which varies the types of pulse widths or modulation methods for each emission of the transmission signals.    
   
   
       3 . The radar device according to  claim 1 , further comprising an unnecessary wave removing unit which activates the control unit and removes a frequency component of a second transmission signal emitted from an interfering station or a frequency component of an echo signal emitted from the interfering station and reflected from an object, from each of reception signals corresponding to the transmission signals, a center frequency of the second transmission signal or the echo signal being close to the center frequency of each of the transmission signals.  
   
   
       4 . The radar device according to  claim 2 , further comprising a secondary echo removing unit which activates the control unit to remove a secondary echo signal in a different type of pulse widths or modulation methods or in a different timing from the transmission signals.  
   
   
       5 . A method for adjusting among radar sites, each radar site performing: 
 generating selectively a set of a plurality of transmission signals differing from one another in center frequency;    emitting the transmission signals;    switching the center frequencies of the transmission signals for each emission of the transmission signals; and    associating with one or more other radar sites for controlling the switching so that each of the center frequencies of the each radar sites do not overlap with a center frequency of a transmission signal of the one or more other radar sites.    
   
   
       6 . The method for adjusting among the radar sites according to  claim 5 , wherein each of the radar sites removes a frequency component of a second transmission signal emitted from interfering radar sites or a frequency component of an echo signal emitted from the interfering radar sites and reflected from an object, from each of reception signals corresponding to the transmission signals, a center frequency of the second transmission signal or the echo signal being close to the center frequency of each of the transmission signals.  
   
   
       7 . The method for adjusting among radar sites according to  claim 5 , wherein each of the radar sites removes secondary echo signals other than the types or timing of the transmission signals.