I/Q DEMODULATION OF RADAR SIGNALS WITH CALIBRATION AND FILTERING

Authors
  1. Lee, J.P.Y.
Corporate Authors
Defence Research Establishment Ottawa, Ottawa ONT (CAN)
Abstract
A simple in-phase/quadrature (I/Q) demodulator architecture which can measure the amplitude, phase and instantaneous frequency of radarsignals is examined in this report. This architecture has a potentialfor radar ESM applications where wide instantaneous bandwidth and simple algorithms for extracting the modulation characteristics of radar signals are required. This I/Q architecture can meet the requirement by splitting an incoming signal into its in-phase and quadrature components using analog circuitries. However in practice, there are amplitude and phase imbalances between the two components and DC offsets, which can introduce large systematic errors to the measurement. In this report, we present novel techniques which can greatly reduce the systematic errors and improve the accuracy of the measurement. A time-domain analysis on the systematic errors is given. TRUNCATED
Report Number
DREO-1119 —
Date of publication
15 Dec 1991
Number of Pages
67
DSTKIM No
93-00114
CANDIS No
127362
Format(s):
Hardcopy;Originator's fiche received by DSIS

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