What are the unique codes that identify each GPS satellite called?

The unique codes that identify each GPS satellite are known as PRN codes, or Pseudo-Random Noise codes. Each satellite transmits a specific PRN code alongside its signal, allowing receivers to differentiate between signals from different satellites. This coding system is crucial for enabling accurate positioning, as it helps the receiver isolate each satellite's signal even when they are broadcasting on the same frequency.

PRN codes are designed to be distinctive and are used in the GPS system to ensure that the signals can be accurately interpreted. Each satellite has a specific PRN code assigned, which allows the GPS receiver to compute its position and speed based on the signals received from multiple satellites.

In contrast, the other terms provided do not specifically refer to the codes used for satellite identification in GPS technology. Satellite Codes and Tracking Codes lack the specific context and technical accuracy that PRN Codes provide, while Signal Codes might imply the general type of signals but don't convey the unique identification aspect inherent to PRN codes.