Radiometric detection of spreadspectrum signals in noise of uncertain power
Abstract
The standard analysis of the radiometric detectability of a spreadspectrum signal assumes a background of stationary, white Gaussian noise whose power spectral density can be measured very accurately. This assumption yields a fairly high probability of interception, even for signals of short duration. By explicitly considering the effect of uncertain knowledge of the noise power density, it is demonstrated that detection of these signals by a wideband radiometer can be considerably more difficult in practice than is indicated by the standard result. Worstcase performance bounds are provided as a function of input signaltonoise ratio (SNR), timebandwidth (TW) product and peaktopeak noise uncertainty. The results are illustrated graphically for a number of situations of interest. It is also shown that asymptotically, as the TW product becomes large, the SNR required for detection becomes a function of noise uncertainty only and is independent of the detection parameters and the observation interval.
 Publication:

IEEE Transactions on Aerospace Electronic Systems
 Pub Date:
 July 1992
 DOI:
 10.1109/7.256287
 Bibcode:
 1992ITAES..28..654S
 Keywords:

 Radiometers;
 Signal Detection;
 Spread Spectrum Transmission;
 Wideband Communication;
 Signal To Noise Ratios;
 White Noise;
 Communications and Radar