An optimum filter for direct A/D conversion

A Digital Correcting Algorithm of Quadrature Double Channels Unbalance

“…(Pi #9q (2) Be brief, assumed fo > 0, and the following deduction is also the same with fo < 0. Firstly, the analytical expression of I channel signal is satisfied with …”

“…Up to now, the main technologies to implement quadrature double channels are listed below: Low Filter Method [1], Hilbter Filter Method [2] and Polyphase Filter Interpolation Method [3]. But because of the instability of temperature, humidity and voltage, etc, it is very difficult to make the quadrature double channels balanced in practical application, which will limit the dynamic range of receiver [4].…”

Multichannel Receiver Characterization for Adaptive Array Applications. Phase 3: Assessment of the Bistatic Receiver Testbed as a Measurement Tool for Clutter Phenomenology

“…(1-15) Figure 3.5 presents the same recording after digital IF-to-quadrature detection. The digital IF-toquadrature process used the Hubert transform process given in several references [7,[26][27][28][29]. Fourier transforms of twice the sample window are used to eliminate the increase in noise due to foldover.…”

Multichannel Receiver Characterization for Adaptive Array Applications Phase 5: Experiments/DSP Software

“…The digital I/Q process is a frequency-domain technique using the Hubert transform [30][31][32][33][34]. The process transforms the input data on a pulse by pulse basis.…”