Abstract
Abstract Because of its low power consumption and high stability, the surface acoustic wave (SAW) chirp transform spectrometer (CTS) has been widely applied in deep space missions for exploring space beyond Earth. In this paper, a comprehensive description of a new CTS with 1GHz bandwidth and 100kHz spectral resolution is presented. This spectrometer is implemented in a combination of digital and analog. The Chirp signal with a bandwidth of 2 GHz is generated by DDS as the expander and a SAW chirp filter with 1GHz bandwidth and 10μs dispersion is used as the compressor. The system is completely constructed for the back-end data acquisition and processing part of the CTS. Aiming at the detection demand and acquisition problem of weak signals in deep space in the field of deep space exploration, the pulse integration technique is used to improve the detection capability of the Chirp transform spectrometer for weak signals, and the synchronization and real-time implementation of the high-speed system in the process of pulse integration are discussed and designed in detail. The pulse width of the accumulated spectrum is about 1.2ns, and the corresponding frequency resolution is 120kHz, which is close to the theoretical value.
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