Aerospace and Electronic Systems Magazine May 2017 - 51
Wang
Table 1.
Element Excitations w m (10 -3) for the BPSK Symbols
Excitations
wm
Symbol 1
Symbol 0
w1
−9.53-j 11.32
11.80-j 8.59
w2
−6.49+j 14.68
−15.13-j 8.92
w3
7.36-j 1.34
−129.54+j 13.09
w4
2.20+j 12.07
−1.57-j 7.01
w5
28.22-j 26.50
−4.53+j 26.80
w6
−63.43-j 20.36
56.14-j 12.39
w7
19.69+j 89.13
−44.31-j 80.30
w8
81.46-j 77.92
−87.64+j 86.18
w9
−126.52-j 38.25
125.29+j 67.84
Far-field DM beam pattern for BPSK transmission.
w10
20.48+j 143.35
20.48-j 143.35
w11
125.29-j 67.84
−126.52+j 38.25
LPI radar applications. This article welcomes more publications
and research on this promising topic.
w12
−87.64-j 86.18
81.46+j 77.92
w13
−44.31+j 80.30
19.69-j 89.13
w14
56.14+j 12.39
−63.43+j 20.36
w15
−4.53-j 26.80
28.22+j 26.50
w16
−1.57+j 7.01
2.20-j 12.07
Figure 6.
REFERENCES
[1]
[2]
cannot steer to a range-dependent position. Because the FDA apparent scan angle is not equal to its nominal scan angle, the actual beam-steering direction cannot be effectively predicted as in
conventional phased arrays. This enables enhanced security in the
beam scanning and is particularly useful for secure point-to-point
communications. Moreover, because the phases of the FDA transmitted signals add constructively in certain regions, while destructively in others, we can use this property to suppress interference
or avoid transmitting the signals to undesired regions. Therefore,
the LPI scheme can be developed by combining DM and FDA for
integrated radar communication systems.
[4]
[5]
[6]
[7]
CONCLUSION
Because active radar is often highly visible to intercept receivers
due to its high-power signal transmission, we introduce several potential transmit beamforming schemes for active LPI radars to enhance the system surveillance performance. The first LPI scheme
is to use a series of spoiled low-gain beams, instead of traditional
high-gain array beams, to reduce the radar visibility without degrading the original radar performance. The second LPI scheme is
to use the FDA antenna by exploiting its range, angle, and time-dependent transmit beam pattern to increase the LPI capability of the
radar transmitter. The third scheme is the DM technique, which enables the transmitted signals to be decoded by an intended receiver
and, simultaneously, in undesired directions to not be successfully
decoded. Indeed, these three schemes can be jointly used for active
MAY 2017
[3]
[8]
[9]
[10]
[11]
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