Active Array Radar System Research Articles

Application of waveform weighting for a frequency- invariant transmit beampattern

Advanced radar systems rely on multichannel, wideband operation. NASA's Ecosystem SAR (EcoSAR) and second-generation digital beamforming SAR [1]–[3] use active array architectures, where an active array radar system contains independent transmit and receive chains with unique amplifiers for each antenna element in the multichannel system. These radar systems have an independent arbitrary waveform generator for each channel and are designed to address wideband transmit beamforming. Unlike conventional narrowband beamforming, which only require a unique set of beamsteering coefficients per look angle, wideband beamforming requires beamsteering coefficients that vary with both look angle and frequency.

능동 배열 레이더 시스템 구현을 위한 반도체형 송수신기 설계

This paper presents design and measurement result of S-band, kW solid-state transmitter and receiver for active array radar system. Transmitter characteristics show 63 dB gain, 200 usec pulse width(max.), 10 % duty(max.) and 63 dB pulse to pulse stability. Receiver characteristics show 23 dB gain and 3.2 dB noise figure. Receiving mode for pulse network analyzer is used for pulse to pulse stability measurement. Measurement results satisfies all specification.