GPS WEEK NUMBER DRIVER
GPS WEEK NUMBER SOFTWARE
GPS WEEK NUMBER CODE

GPS WEEK NUMBER CODE

In particular, we describe how code execution patterns were subtly altered after the GPS week number rollover of April 2019, how this led to Iridium satellite communications and data collection failures, and how communications and data collection were ultimately restored. In this work, we describe how these principles apply to a communications failure on Autonomous Adaptive Low-Power Instrument Platforms (AAL-PIP) deployed in Antarctica. These guiding principles are especially pertinent for instrument platforms operating in space or in remote locations like Antarctica, where restorative maintenance is both difficult and expensive. Although it is impossible to predict every fault that may occur in a complicated system, there are a few best practices that can allow for graceful fault recovery and restorative action.

GPS WEEK NUMBER SOFTWARE

Due to the rarity of these events (19.6 years for GPS), software designers may be unaware of such circumstance, or may choose to ignore it for development complexity considerations. This reliance can create problems when the timekeeping counter aboard a satellite overflows and begin a new epoch. They can help share the status of your device and/or equipment to help your business better prepare for the WNRO.Instrument platforms the world over often rely on GPS or similar satellite constellations for accurate timekeeping and synchronization. It’s important to check in with your GPS software provider. This would extend the length of the epoch to around 157 years versus the current standard of approximately 20 years. Increasingly, there is a move towards using a 13-bit instead of a 10-bit data field to track week numbers. Is anything being done to prevent this from happening again?Īll aspects of GPS performance are constantly being monitored and improved, and this includes the way it manages the week number. Simply ensuring your software is up to date can mitigate future technical glitches. However, that does not mean you should ignore this WNRO. The first GPS rollover occurred on 26 August 1999, 1,024 weeks after the first GPS satellite was launched in 1980.įor the most part – everything continued on as normal with little implications. This is because some receivers use firmware that ensures the reset comes after the time of the device’s manufacturer date, rather than after the last reset.

However, even if you don’t experience system errors or confusion straight away, it’s possible that your GPS receivers will malfunction later down the line. To avoid any potential errors in your fleet, we recommend checking the status of your GPS equipment before the WNRO takes place.Ħ April 2019 is when the current epoch comes to an end and the GPS WNRO begins. For example, a tracking device used as part of your fleet management process, may begin to operate based on information that is timestamped two decades ago. If a GPS receiver is confused by the rollover, it’s possible that errors will occur.

GPS WEEK NUMBER DRIVER

As a result, some chips in driver terminals will lose the ability to process certain functions. However, when the calendar resets, it causes a miscommunication between GPS satellites and GPS receiver chips. Everything goes back to zero and the count begins again. This allows up to 1,024 weeks to be handled and is referred to as an ‘epoch’.įor this reason, every 1,024 weeks, the system clock must be reset. In other words, there is a limited amount of possibilities to be shown on the clock. All GPS receivers use a 10-bit field to encode a GPS’ time message. As many programmes had been set up to recognise the year based on its last two digits, careful measures needed to be taken to ensure the turning of the calendar from 1999 to 2000 did not cause chaos. To help prepare your business, leading telematics solution provider, TomTom has answered some of the more important questions you may be asking in the wake of WNRO.ĭo you remember the Millennium Bug? As the year 2000 approached, organisations all over the world were upgrading their computer systems to counteract the effects of a programing issue several decades in the making. If your company is impacted, it could cause serious confusion and potential problems for your team and customers. Does your company rely on GPS or use equipment that relies on GPS to function? If so, it’s imperative you ensure your business is ready for the GPS Week Number Roll Over (WNRO).Īlso known as the GPS Leap, this event will affect many GPS receivers in Australia and will take effect from 6 April 2019.

Gps week number