  The spatial distribution, Galactic model parameters and luminosity function
of cataclysmic variables (CVs) are established using re-estimated trigonometric
parallaxes of {\it Gaia} DR3. The data sample of 1,587 CVs in this study is
claimed to be suitable for Galactic model parameter estimation as the distances
are based on trigonometric parallaxes and the {\it Gaia} DR3 photometric
completeness limits were taken into account when the sample was created.
According to the analysis, the scale height of All CVs increases from 248$\pm$2
to 430$\pm$4 pc towards shorter periods near the lower limit of the period gap
and suddenly drops to 300$\pm$2 pc for the shortest orbital period CVs. The
exponential scale heights of All CVs and magnetic systems are found to be
375$\pm$2 and 281$\pm$3 pc, respectively, considerably larger than those
suggested in previous observational studies. The local space density of All CVs
and magnetic systems in the sample are $6.8^{+1.3}_{-1.1}\times$10$^{-6}$ and
$2.1^{+0.5}_{-0.4}\times10^{-6}$ pc$^{-3}$, respectively. Our measurements
strengthen the 1-2 order of magnitude discrepancy between CV space densities
predicted by population synthesis models and observations. It is likely that
this discrepancy is due to objects undetected by CV surveys, such as the
systems with very low $\dot{M}$ and the ones in the period gap. The comparisons
of the luminosity function of white dwarfs with the luminosity function of All
CVs in this study show that 500 times the luminosity function of CVs fits very
well to the luminosity function of white dwarfs. We conclude that the
estimations and data sample in this study can be confidently used in further
analysis of CVs.
