Chabad.org — English translation + Rashi
Torah Temimah: “ותקעתם תרועה” teaches that tekiah and teruah are distinct blasts.
English: “And you shall sound a teruah” — tekiah by itself and teruah by itself.
Separation of blasts — the verse structure proves two distinct sound-types.
The camp moves on a teruah that is preceded and followed by tekiah; the sounds are not collapsed into one.