A Novel if Receiver Structure in Hyperspectral Radiometer

The IF receiver is an essential part in hypspectral radiometer. In this paper, we present an improved structure of chirp transform spectrometer (CTS) for hyperspectral radiation measurement. The traditional two-channel structure of CTS based on radar pulse compression technique has many advantages as well as some limitations. Considering the limitations, the traditional two-channel symmetrical structure is modified to a simple structure for stationary signal measurement. The working principle of the improved structure is described in detail and its limitation of application is analysized. Two simulation models for the traditional structure and the improved one are built in Advanced Design System. Results demonstrate that the distribution of time domain pulses of the novel structure is the same with that of the traditional structure. The amplitude accuracy, dynamic range and frequency resolution are also the same. Compared to the traditional structure, the improved structure saves components, power consumption and has less weight and more simple control system, which is suitable for practical application especially in aviation and space.