55.Signal Processing - download pdf or read online

By John G. Webster (Editor)

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In applications where there is multipath propagation, the spatial diversity of the multipleinput multiple-output (MIMO) channel may provide per- Radar, Adaptive 27 Figure 14. The log likelihood surface [Eq. (213)] for quiescent and clutter environments (SNR = 20 dB). Space–time adaptivity distorts the mainlobe seen on the right. formance advantages in terms of additional sampling and resolution [Bliss (55)], [Fishler (57)]. 36. 37. 38. 39. NOTATION 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14.

26) and (34). The space–time steering vector v(fd , φ, θ) is Radar, Adaptive given by Eq. (31) and may also have a space–time taper for sidelobe control. If R is a Toeplitz–block-Toeplitz clutter covariance matrix with rank N + β(M − 1), then the reduced dimension covariance TH RT is also Toeplitz–block-Toeplitz and has rank Beam-Space Pre-Doppler STAP. Beam-space pre-Doppler STAP algorithms are a generalization of the earliest nonadaptive space–time technique used to mitigate clutter interference—an airborne MTI (AMTI) technique called displaced phase-center antenna, or DPCA (3).

Real-time implementation of STAP methods demands high performance front-end signal processing and computing architectures [Martinez (64)], [Martinez (63)], [Martinez (62)]. STAP algorithms are compared by examining the SINR loss they achieve (see the sub-subsection “SINR and SINR Loss” above). Because pulse–Doppler radars operate by transmitting a beam of energy in a given direction, then examining the radar echoes for the presence of targets at any speed, the SINR loss is plotted as a function of target Doppler frequency at a fixed direction of interest.

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55.Signal Processing by John G. Webster (Editor)


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