Radiometer RFI Mitigation Chad Forshee University of Kansas EECS 823 Fall 2014

Background Interference from human-made signals in the radiometer band are termed radio-frequency interference (RFI) [2]. Operators in microwave band Radiometry, where sensitive to signal of interest and insensitive to atmosphere Wireless comms, for insensitive atmosphere

Background: Effects RFI causes an additive offset on actual T B [3]. Types Narrow-band communications, resulting in persistent, high offset of T B over radiometer integration time. Wide-band systems like RADAR where gating of pulse leads to a low-power, persistent offset of T B over radiometer integration time.

Illustration: SMOS with High RFI [1]

Illustration: SMOS with Lower RFI [1]

Agile Digital Detection (ADD) [3]

Project Goals Motivate design of ADD system thru statistics of RFI and radiometer thermal brightness Detail architecture of an ADD system Simulate RFI distortion and demonstrate ADD operation on simulated data

References 1Allen, Christopher. EECS 823 Fall 2014 Radiometers (course notes). University of Kansas EECS. Microsoft PowerPoint file. 2Misra, S.; Mohammed, P.N.; Guner, B.; Ruf, C.S.; Piepmeier, J.R.; Johnson, J.T., "Microwave Radiometer Radio-Frequency Interference Detection Algorithms: A Comparative Study," Geoscience and Remote Sensing, IEEE Transactions on, vol.47, no.11, pp.3742,3754, Nov Ruf, C.S.; Gross, S.M.; Misra, S., "RFI detection and mitigation for microwave radiometry with an agile digital detector," Geoscience and Remote Sensing, IEEE Transactions on, vol.44, no.3, pp.694,706, March 2006