초록 ▼

A double sideband linear frequency modulation technique for radar applications is disclosed for obtaining simultaneous range and doppler measurements. The method of obtaining measurements is useful in a variety of radar applications; however, the most promising area is in continuous wave radar syste

A double sideband linear frequency modulation technique for radar applications is disclosed for obtaining simultaneous range and doppler measurements. The method of obtaining measurements is useful in a variety of radar applications; however, the most promising area is in continuous wave radar systems. Linear Frequency Modulated (LFM) waveforms of both increasing and decreasing frequency are simultaneously transmitted. Upon reception, these sideband signals are combined coherently to give an output that is a function of the target\s radial velocity. The received signals are also processed separately to obtain target ranging information.

대표청구항 ▼

In a radar system wherein a continuous wave of electromagnetic energy is transmitted toward an object and reflected energy is received from the object, the improvement of a double sideband linear frequency modulation system comprising: transmitting means providing upper and lower sidebands of a carr

In a radar system wherein a continuous wave of electromagnetic energy is transmitted toward an object and reflected energy is received from the object, the improvement of a double sideband linear frequency modulation system comprising: transmitting means providing upper and lower sidebands of a carrier signal with simultaneously increasing and decreasing transmitted frequency waveforms; receiving means adapted for receiving reflected portions of said transmitted waveforms, and for separating said reflected portions into said upper and lower sidebands of said carrier signal, said upper and lower portions of reflected energy having both range and doppler signal components therein simultaneously; and signal processing means for coherently combining the reflected sideband portions for separating the range and doppler signal components, said signal processing means comprising a first mixer having inputs adapted for receiving said reflected sideband portions for providing a sideband sum output, and a notch filter responsive to said sum output for eliminating clutter and thereby enhancing the frequency component of the signal output therefrom for determining radial velocity of the object.