As defined by FS-1037C and ITU Radio Regulations, radiodetermination is:

the determination of the position, velocity or other characteristics of an object, or the obtaining of information relating to these parameters, by means of the propagation properties of radio waves

There are two main fields to radiodetermination:

Radar is a radiodetermination system based on the reflection (or retransmission) of a radio wave by an object at a position to be determined.

Radiodetermination service is – according to Article 1.4 of the International Telecommunication Union's (ITU) Radio Regulations (RR) – defined as "A radiocommunication service for the purpose of radiodetermination."

Radiodetermination-satelliteservice is – according to Article 1.41 of the ITU-RR – defined as "A radiocommunication service for the purpose of radiodetermination involving the use of one or more space stations. This service may also include feeder links necessary for its own operation."

This radiocommunication service is classified in accordance with ITU-RR (article 1) as follows:
Radiodetermination service (article 1.40)

The allocation of radio frequencies is provided according to Article 5 of the ITU-RR(edition 2012).