Sürekli Dalga Radar Sistemlerinde Özgirişim Tekniklerinin İncelenmesi

Abstract

In the past, FMCW radars were not preferred in the industry because they were large and bulky. With developing technology, they have expanded their usage areas due to the high resolution, low transmission power, simpler and small structure. In the literature, FMCW radars are used in industrial and military areas. Some of these are vehicle speed measurement on highways, vehicle collision warning systems, human and target detection in different environments.

FMCW radars emit a continuous frequency modulated signal at low power and receive at this emitted instantaneously. However, since this type of radar uses bidirectional data transmission as it transmits and receives simultaneously, the strong transmit signal leakage the receiver path. This leakage is called self-interference. For the received signals to be detected properly, the biggest and limiting problem in the FMCW radar, self-interference must be canceled.

This cancellation can be done in three different areas such as propagation, analog, and digital domain. In this thesis, self-interference cancellation with Wiener filter in the analog domain is studied.

In the literature, IMST 24 FMCW Radar, which has lots of work in the field study, will be used as the radar to which Wiener filter will be applied. In the field study, assuming that two scatterers are placed in the field, the self-interference of these scatterers will be suppressed with a Wiener filter.