Patent ID: 8018374

Claim:
A radar comprising: a signal processing unit including at least one D/A converter, which converts a pulse compression modulation signal of digital waveform data to an analog waveform, and at least one A/D converter, which converts a received analog signal to a digital signal; a transmitter unit including at least one oscillator, which frequency up-converts the pulse compression modulation signal of the analog waveform generated by the signal processing unit, and a first amplifier, which amplifies the frequency up-converted pulse compression modulation signal and generates an RF signal; an antenna unit which radiates the RF signal generated by the transmitter unit towards the atmosphere as RF waves and receives RF waves reflected or scattered in the atmosphere and returned as a RF signal; and a receiver unit including a second amplifier which amplifies the RF signal received by the antenna unit, in which the receiver frequency-down converts the RF signal, which is amplified by the second amplifier, with the at least one oscillator to generate an IF signal and provides the IF signal to the signal processing unit as the analog signal; the radar being characterized in that the antenna unit includes: first and second transmission-reception radio wave lenses, in which the first and second transmission-reception radio wave lenses each include a focal point and are each formed from a dielectric to be spherical so as to have a relative permittivity that varies at a predetermined rate in a radial direction; and first and second transmission-reception primary radiators respectively arranged at the focal points of the first and second transmission-reception radio wave lenses; wherein the first and second transmission-reception primary radiators are configured to pivot in an elevation direction about a first axis connecting a center point of each of the first and second transmission-reception radio wave lenses and pivot in an azimuthal direction about a second axis orthogonal to the first axis.