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This paper presents a dual-mode intermediate frequency (IF) signal processing circuit for pulse compression radar (PCR) and symbol recovery. A half-duplex architecture is proposed to support modulation and demodulation of PCR signals. For data communication, the modulator and the demodulator support up to 3-Gb/s QPSK signal. For range sensing, the proposed IF correlation technique supports 1.5-GHz...
A new method for estimating direction of arrival (DOA) of the strong and weak signals is proposed in the presence of array gain and phase mismatch. Firstly, the array gain and phase mismatch is estimated using the norm of the error vector between the practical steering vector and the theoretical vector of the strong signal, and then the data covariance matrix is calibrated. Secondly, the new seek...
On September 6, 2008, the satellite HJ-1B was launched into a sun-synchronous, near-polar orbit. In order to determine temporal changes of the absolute radiometric calibration of the HJ-1B satellite in flight, a program was carried out at DunHuang calibration field, Gansu province of China, from August 19 to 30, 2009. In this work, reflectance -based calibration method was employed to simulate the...
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