Abstract
An algorithm based on a space fast-time adaptive processor is presented for nulling the mainlobe jammer when the jammer and the target of interest share the same bearing. The computational load involved in the conventional processor, which blindly looks for the terrain-scattered interference (TSI), is required to stack a large number of consecutive range cell returns to form the space fast-time data snapshot making it almost impossible to implement in real time. This issue is resolved via the introduction of a preprocessor (a TSI finder which detects the presence of the minute levels of multipath components of the mainlobe jammer and associated time delays) which directs the STAP processor to select only two desired range returns in order to form the space fast-time data snapshot. The end result is a computationally extremely fast processor. Also a new space fast-time adaptive processor based on the super-resolution approach (eigenvector-based) is presented.
Highlights
Mainbeam jamming poses a difficult and challenging problem for the modern multichannel radar
This enables us to form the space fast-time data snapshot as a 2N × 1 vector by stacking the correct auxiliary range return with the current range cell of interest, where N is the number of array elements
As we interrogate the rth range cell for targets in the presence of a mainlobe jammer, we would like the proposed terrain-scattered interference (TSI) finder to determine the exact time delay so as to form the 2N × 1 space fast-time data snapshot at each range
Summary
Mainbeam jamming poses a difficult and challenging problem for the modern multichannel radar Conventional processing techniques such as adaptive sidelobe cancelling or space-time adaptive processing (as in space slow-time adaptive processing) can successfully suppress the sidelobe jammers, where the space slow-time adaptive processing refers to the stacking of spatial data corresponding to a series of coherent pulses to form the space-time data snapshot for the range cell being interrogated [1]. A preprocessor is presented for identifying the availability of the TSI power and the associated path delays corresponding to the mainlobe jammer This enables us to form the space fast-time data snapshot as a 2N × 1 vector by stacking the correct auxiliary range return (which corresponds to the TSI delay) with the current range cell of interest, where N is the number of array elements. The order of the computational load is reduced from (NMR) to (2NM) where M is the number of coherent pulses and R is the number of fast-time range cells to be used (R is generally unknown, but large) in order to form the space fast-time component of the data vector
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