Taking a planet with low-tech?

[Suicide Junkie]

Blockading the planet will help get them to surrender, as (i think) it cuts off all resource generation on the planet.

If you want to do a military takeover, I suggest building 3 heavily shielded/armored transports full of troops.
Add a fleet of suicide PD ships to protect the transports on the way in.
Your troops will then take the planet & the PD ships can attack the satellites.