Mediatek to implement new L5 engine, powering smartphone and sport watch

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https://www.ion.org/gnss/abstracts.cfm?paperID=15709

Smartphone today use low energy cost multi-band GNSS solution: use L1 tracking to aid L5 tracking. And this approach make it harder to get high accuracy L5 signal under interference.

The paper's abstract introduces a novel solution: a new generation acquisition engine designed to mitigate the dependency on the L1 signal. This engine reportedly reduces computational load and hardware requirements, making independent acquisition for L5 feasible on consumer level products.

Here's how the new approach tracks L5:

Under normal conditions (L1 available band  reliable): The system likely utilizes an optimized strategy that supports both L1-aided fast search and the L5-only full-range search offered by the new engine. The L1-aided approach would likely provide faster acquisition times when the L1 signal is strong and clear.

Under challenging conditions with L1 degradation or jamming: This is where the new engine provides a significant advantage. Unlike the L1-aided method, the new engine does not rely on the L1 signal for L5 acquisition. In scenarios like long tunnels with signal blocking and L1 jamming, the new engine allows the receiver to disregard incorrect L1 information and focus on acquiring the L5 signal. This serves as a crucial backup, enabling the system to potentially regain tracking status and restore a position fix even when the L1 signal is unavailable or unreliable.

The study evaluates the performance of this new strategy, with the improvement measured by position recovery timing. The abstract highlights that this new generation acquisition engine represents a significant advancement in overcoming the limitations of traditional L1-aided methods, offering a more robust and versatile solution for modern GNSS applications, particularly in low-cost, low-power devices operating in varied environments.