Airservices will begin upgrading the instrument landing systems (ILS) at Sydney and Canberra airports on 9 January and 16 January respectively.
In Sydney, work will start on the ILS on 34L at the southern end of the main runway. The project will last for around three months.
Meanwhile, work on the Canberra ILS will include removing the existing ILS from service and replacing the equipment for the transmitter, glide path and localiser antenna array.
The company said it will commission the new systems before winter.
The work will be carried out when the weather is favourable and outside of peak travelling periods such as Christmas, said Dan Galazowski, Airservices's acting general manager for technology and asset services.
The ILS is a course-forming radio navigation aid that supports the safe and efficient movement of air traffic into and out of the airport, particularly during low visibility and bad weather conditions.
Airservices added that it has been gradually upgrading and replacing ILS equipment in Australia to ensure continued service provision until 2025.