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SCIENCE CHINA Information Sciences, Volume 62 , Issue 4 : 040302(2019) https://doi.org/10.1007/s11432-018-9735-6

Diversity considerations in wideband radar detection of migratingtargets in clutter

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  • ReceivedNov 2, 2018
  • AcceptedJan 5, 2019
  • PublishedFeb 20, 2019

Abstract


Acknowledgment

This work was partially supported by STW (now Toegepaste en Technische Wetenschappen (TTW)) (Grant No. 12219).


References

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  • Figure 1

    Detection and false alarm probabilities after imposing a threshold $T$ on the detected quantity $X$ [1].

  • Figure 2

    (Color online) The diversity gain for fluctuating target detection. The traces show noncoherent versus coherent integration for a $P_{\rm~fa}=10^{~-~6}$. The vertical scale is linear (not in dB).

  • Figure 3

    (Color online) Range migrating extended target in spiky clutter.

  • Figure 4

    (Color online) Detection probability of a range migrating point target in compound Gaussian clutter with: $~v~=~0$ m/s and $v~=~15$ m/s, SCR is the power of clutter after whitening, exponential correlation in range with $\gamma~=~1$ and $\gamma~$ $=~+\infty~$; PFA = 10$^{~- 5}$. Radar parameters: $f_{c}=~10$ GHz, $B~=~1$ GHz, $\delta_{R}=~0.15$ m, $T_{r}=~1$ ms, $M$ (number of pulses) = 32.

  • Figure 5

    (Color online) Exponential model for diffuse clutter$^{3)}$.

  • Figure 6

    (Color online) Residual clutter after adaptive filtering (diffuse clutter only).

  • Figure 7

    (Color online) Loss of SCNR for WB (a) and NB (b) radars in the presence of purely diffuse clutter. $\beta$ is the clutter shape parameter and $\omega$ is the wind speed.

  • Figure 8

    (Color online) Loss of SCNR of WB radar in the presence of both stationary and diffuse clutter, after adaptive filtering.

  • Figure 9

    (Color online) Residual clutter after adaptive filtering of stationary (a) and moving (b) targets in the $K$-distributed model of clutter.

  • Table 1   Characteristics of wideband and narrowband radars
    ParameterWB radarNB radar
    $f_{c}$10 GHz10 GHz
    $B$1 GHz10 MHz
    $T_{r}$1 ms1 ms
    $M$ (pulses)6416
    $V_{a}$15 m/s15 m/s
  • Table 2   Four different target extent situations; in each case, the targetextent is assumed to be 4 range cells for signal processing (non-coherentsummation along the target extent profile)
    Model numberCell number
    1234
    11/41/41/41/4
    21/21/41/40
    33/41/400
    41000