Known Issues and Limitations#

  • Mode-3 (PBR + RTT) is not supported. The only way to combine PBR and RTT is through the use of submodes.

  • Submodes can currently be used subject to the following limitations:

    • Only RTT can be used as submode, with PBR as the main mode.

    • Each submode step must be preceded by 2 main mode steps.

    • Channel map must be set to HIGH.

    • Using submodes increases the calculation time.

  • The accuracy of RTT is sub-optimal compared to PBR and performance improvements are under development.

  • Measurement accuracy is heavily affected by the movement speed of the devices. For high accuracy, the movement speed must be lower than 2.1 m/s when operating in the SL_RTL_CS_ALGO_MODE_REAL_TIME_FAST mode, and 1 m/s when operating in the SL_RTL_CS_ALGO_MODE_REAL_TIME_BASIC mode. We are constantly working on improving accuracy and responsiveness for dynamic use-cases.

  • Environmental conditions e.g. walls and metal acting as RF reflectors can affect accuracy.

  • Interoperability with other vendors’ solutions is not yet supported.

  • When operating in SL_RTL_CS_ALGO_MODE_STATIC_HIGH_ACCURACY mode, a degradation in accuracy can be observed in low SNR (Signal-to-Noise Ratio) RF environments.

  • The likeliness indicator should be used with caution. A high value (close to 1) indicates that an estimated distance is likely accurate, while a low value (close to 0) is unreliable and may or may not indicate a bad distance estimate.

  • The maximum supported range in SL_RTL_CS_ALGO_MODE_REAL_TIME_FAST mode is 40 m.

  • The Ranging Service does not support the filtering feature.

  • The diagnostic data mode in the Channel Sounding Analyzer has the following limitations:

    • NCP baud rate must be set to 921600.

    • When using submodes or SL_RTL_CS_ALGO_MODE_REAL_TIME_BASIC, the procedure intervals must be increased from the default value.