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We give a general construction leading to different non-isomorphic families$\Gamma_{n,q}(\K)$ of connected $q$-regular semisymmetric graphs of order$2q^{n+1}$ embedded in $\PG(n+1,q)$, for a prime power $q=p^h$, using thelinear representation of a particular point set $\K$ of size $q$ contained in ahyperplane of $\PG(n+1,q)$. We show that, when $\K$ is a normal rational curvewith one point removed, the graphs $\Gamma_{n,q}(\K)$ are isomorphic to thegraphs constructed for $q$ prime in [9] and to the graphs constructed for$q=p^h$ in [20]. These graphs were known to be semisymmetric but their fullautomorphism group was up to now unknown. For $q\geq n+3$ or $q=p=n+2$, $n\geq2$, we obtain their full automorphism group from our construction by showingthat, for an arc $\K$, every automorphism of $\Gamma_{n,q}(\K)$ is induced by acollineation of the ambient space $\PG(n+1,q)$. We also give some otherexamples of semisymmetric graphs $\Gamma_{n,q}(\K)$ for which not everyautomorphism is induced by a collineation of their ambient space.

A construction for infinite families of semisymmetric graphs revealing their full automorphism group