There several way to deter cat, I too take extreme measurement to deter cat away else I can't sleep at night when they in heat.

1) Use tiger poo, no small creature will venture to your house proximity.
2) Sprinkle cinnamon on places that cat normally sleep.

Non-humane way to the cat owner
1) Civet cage to lure them and throw them far far
2) Hire Vietnamese worker - end of all your stray animal problem at once.