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4 depicts the changes of relevant eigenvalues of PDB-1, PDB-3, PDB-5 and UHB-LP at equilibrium points.
At the L = 0.6120555 (PDB-3) value, the eigenvalues are ([e.sub.1,2] = -0.148 [+ or -] 2.22i, [e.sub.3] = 0,057, [e.sub.4] = -6,80).
In 1993 a PDB-3 QRP (Quick Response Configuration) software release was adopted in order to further improve effectiveness against TBMs as well as enhance command and control capabilities; it went together with radar enhancements and other modifications which provided Patriot with improved intercept capabilities for a larger area of defence against TBMs.
The PDB-3 QRP software received a minor upgrade known as 'mini-sweep'.
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