Deriving power fluctations from Swerling Models in an FMCW Radar

[Johnny Radar]

Dear all,

Most radar books (skolnik, currie) contain recieved signal
amplitude fluctuation distributions derived from Swerling RCS
fluctuation models for pulsed radars. However, I believe these do not
apply to an FMCW radar. Does anybody know (or some references) how to
derive the resulting power fluctuation pdfs given the Swerling models
for an FMCW radar ?

Thanks in advance,

John.

[Armin Doerry]

Just curious... why would models OK for pulsed radars not apply to FMCW
radars??? Can't we think of FMCW as a pulsed radar with 100% duty
factor????

I'm not arguing... just wondering.....

Armin
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Armin Doerry

Post by Johnny Radar
Dear all,
Most radar books (skolnik, currie) contain recieved signal
amplitude fluctuation distributions derived from Swerling RCS
fluctuation models for pulsed radars. However, I believe these do not
apply to an FMCW radar. Does anybody know (or some references) how to
derive the resulting power fluctuation pdfs given the Swerling models
for an FMCW radar ?
Thanks in advance,
John.

[Ron Larham]

The Swerling models tell you little about the autocorrelation
of the apparent target RCS, but you need this for FMCW.

RonL

[Ron Larham]

The Swerling models tell you little about the autocorrelation
of the apparent target RCS, but you need this for FMCW.

Or the phase fluctuations

RonL

[graeme]

Post by Johnny Radar
Dear all,
Most radar books (skolnik, currie) contain recieved signal
amplitude fluctuation distributions derived from Swerling RCS
fluctuation models for pulsed radars. However, I believe these do not
apply to an FMCW radar. Does anybody know (or some references) how to
derive the resulting power fluctuation pdfs given the Swerling models
for an FMCW radar ?
Thanks in advance,
John

The 4 swerling models depend on two factors
1. The rcs distribution, either Rayleigh or Rician
2. Whether the rcs is fully correlated or uncorrelated scan to scan
(NB: all 4 swerling models assume the rcs is constant during the
coherent integration time)

Provided the radar is a scaning radar (ie a surveillance radar) the
swerling models can still be used since there will still be separate
scans.