| 摘要 |
A radiometer system includes a dual channel, quadrature hybrid amplifier circuit that receives an antenna signal and a known reference signal to equalize gain in two parallel gain stages. A detector circuit receives a signal from the quadrature hybrid amplifier circuit and detects the signals to form a detected output for eliminating sensitivity to gain variations, improving dynamic range of the input signal, and reducing calibration requirements. A log ratio amplifier receives and linearizes the detected output. An integrator circuit receives a signal from the log ratio amplifier and sums the signal over an observation. |
