Interference suppression using a COLT signal processor

Abstract

COLT, or continuous look through, is a Xetron signal processing technique for the extraction of a weak signal of interest (SOI) in the presence of a larger interfering (I) signal. The process is successful even when the SOI is entirely contained within the spectral bandwidth of the interferer. In addition, unlike common phase cancellation techniques, COLT does not require a separate sample of the interferer. Extraction under these conditions is not achievable with standard linear frequency selective filter networks. The COLT processor therefore enables the excision of desired signals from jamming energy in real time. Successful extraction of the SOI will result even with the input SOI/I ratio as high as -80 dB. Limitations on COLT performance are imposed only by the dynamic range of the host system or propagation anomalies in the communication channel. This paper details COLT's extraction capabilities and provides performance data for various tactical communication applications.<>