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This article investigates the use of an XM™ signal as a source of opportunity for passive coherent location. An analysis of the echo-to-direct signal ratio and the echo-to-noise ratio emphasises two major target detection problems: the masking effect of the direct signal and the low power of the echo from the reflected signal. First, a subspace-based method is proposed to suppress the direct signal...
The purpose of a system of coherent passive detection is to get back the echo resulting from the reflection on the target to detect. The method by clean analysis based on the projection of signals in an orthogonal sub-space in the direct signal allows preventing the problem of interference which engenders the presence of the signal in direct way in this type of system of detection. In the case of...
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