What are the advantages of pure inertial navigation compared to GPS/GNSS integrated navigation?

Compared with GNSS/INS integrated navigation systems, pure inertial navigation (relying only on inertial sensors and not on external signals such as GNSS) has unique advantages in specific scenarios, mainly reflected in autonomy, reliability, environmental adaptability, and system simplification;

• Fully autonomous operation, independent of external signals:

• High dynamic performance and real-time capability, GNSS update rate is usually 1-10Hz, which cannot meet the real-time control requirements of high dynamic carriers (such as fighter jets and missiles). At the same time, GNSS has signal transmission and resolution delays (about 100ms). The data update rate of inertial navigation is extremely high (100Hz~1kHz), and the output is almost delay free, suitable for high-speed obstacle avoidance and stable platform control.

• Pure inertial navigation has strong environmental adaptability and is not affected by weather conditions such as thunderstorms and sandstorms.

The core weakness of pure inertial navigation is the accumulation of errors over time, but it can be optimized by selecting high-precision sensors such as fiber optic gyroscopes (FOG) and laser gyroscopes (RLG) with drift rates much lower than MEMS, which are suitable for long endurance tasks; Zero Velocity Update (ZUPT)

technology and the method of regularly resetting the position.

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