Matched-Filter CNR, Diversity and Signal Detectivity for Deterministic and Random Coherent Ladar Signals

摘要

In this paper we consider the wideband and matched-filter heterodyne signal Carrier-to-Noise Ratio (CNR), with specific emphasis on continuous ladar signals with arbitrary coherence times. We show that if the coherence time is long compared to the integration time then the conventional CNR expression is valid, and the signal has unit diversity. However when the coherence time is short compared to the integration time, the CNR is reduced by the ratio of these times and the diversity is increased by this same factor. We provide a spectral model for arbitrary coherence times and compare that model to Monte Carlo simulations. We also show how signal detectivity is related to CNR and diversity.