The null depth of all nulls, especially the first one, has been achieved with the help of SSF technique.
Comparison of FNDL and SLL of damage pattern of 7th sensor and SSF 7th sensor failure SSF FNDL (dB) SLL (dB) FNDL (dB) SLL (dB) -32.32 -29.45 -88.98 -26.53 TABLE 3: Recovery of one null. Comparison of NDL and SLL of one sensor failure and SSF Correction of 7th Correction of SSF Recovery of nulls sensor failure NDL (dB) SLL (dB) NDL (dB) SLL (dB) -104.7 -32.99 -111.5 -28.35 1st null recovered.
In adaptive beamforming, null steering and beam steering are hot research areas.
The previous work on null steering in failed antenna arrays is presented in .
As we had assumed the damage of [w.sub.7] sensor, we lost the null depth as given in Figure 1.
where 0; for i = 1,2, ...,M0 is the direction of null. Our goal is to optimize the squared weighting error subject to the condition that
Figures 17 and 18 show the original, damage and corrected pattern of five nulls recovered for single element failure and SEF.
19 shows the corrected pattern with recovered nulls at main beam pointing that is, at [[theta].sub.s] = 120[degrees].
Recovery of one null. Comparison of NDL and SLL of one element failure and SEF Correction of Correction Recovery one element of SEF of Nulls failure NDL (dB) SLL (dB) NDL (dB) SLL (dB) -115.3 -27.66 -116.4 -27.93 1st null recovered.
Null steering and beam steering are active research areas in the field of adaptive beamforming.
As we had assumed the failure of [w.sub.9] element, we lost the null depth as given in Fig.