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This thesis consists of two parts. The first part studies two
algorithms for estimating intercepted signal power levels and
their application to low-probability-of-intercept (LPI) tests.
The second part deals with the estimation of instantaneous
doppler frequency and related higher order statistics. The
detectability of a wide band signal is a function of both the
waveform design and the detector structure. A single parameter
measure called Circular Equivalent Vulnerability Radius (CEVR)
is often used to characterize the LPI capability of a given
signal. To estimate the CEVR of the intercepted carrier-to-
noise power ratio (CNR) at various locations are needed.
Estimation algorithms for the intercepted CNR are proposed,
their statistical properties and reliability are studied.
Signals emitted from a platform with high dynamic will
unavoidably induce rapid-changing carrier doppler. Using the
reconstructed carrier sample phases, we present a least-squares
estimation algorithm to periodically update the local VCO
output. The proposed algorithm is shown to obtain fast
frequency acquisition.
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