Aerospace and Electronic Systems Magazine January 2018 - 37
Xu et al.
4π v0t
phase compensation function exp j
for active radar.
λ
For the RFT output of ( r0 , vk ), i.e., the kth BSSL, the integration RM curve of rs = r0 + vk t may have some overlaid part with
that of rs = r0 + v0t. Furthermore, the Doppler ambiguity, i.e.,
4π vk t
4π v0t
exp j
, occurs when the slow-time t is
= exp j
λ
λ
sampled with a limited PRF fP as the sampling frequency. Therefore, the RFT output of ( r0 , vk ) will also generate a peak-like output due to the partially coherent integration along the overlaid
part of rs = r0 + v0t and rs = r0 + vk t. Accordingly, the peak-to-sidelobe ratio (PSLR) [10] of the kth BSSL can be given as
PSLR ( k ) = k
λTf P
,
4ρr
(4)
where T and ρr are integration time and range resolution, respectively. From (4) it is shown that the PSLR as well as the
BSSL suppressing performance will be improved with the
increases of PRF, integration time, and range resolution. Unfortunately, these parameters will be limited for system design and cannot cancel the BSSL completely. Therefore, an
effective BSSL suppression method has been proposed based
on "symmetric windows [10]." In Figure 4(a) two symmetric
windows, i.e., window 1 and window 2, are located around the
In marine environments,
radar echoes generated by
the motion of the sea can
make it a challenge to detect
a marine vessel against the
moving background of the sea
it maneuvers in. However, it is
possible to adopt the proposed
focus-before-detection (FBD)
method with high-order motions
to suppress the sea clutter and
improve target detection.
Figure 4.
Outputs of the second-order GRFT with different 2D intersections (range center is 200 Km). (a) Symmetric window. (b) Output with window 1. (c)
Output with window 2. (d) Intersection of (b) and (c).
JANUARY 2018
IEEE A&E SYSTEMS MAGAZINE
37
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