The track-before-detect (TBD) approach can be used to track a single target in a highly noisy radar scene. This is becauseit makes use of unthresholded observations and incorporates a binary target existence variable into its target stateestimation process when implemented as a particle filter (PF). This paper proposes the recursive PF-TBD approach todetect multiple targets in low-signal-to noise ratios (SNR). The algorithm’s successful performance is demonstratedusing a simulated two target example