Андрей Яковлев / Andrei Iacovlev: mobile

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пятница, 17 июля 2020 г.

QGIS and Free Mobile Applications

Perhaps an example of the growing power of QGIS is how mobile applications have been integrated with this tool in recent years. Mobile applications are becoming popular in their use for data collection, particular in the field when researchers or data collectors are deployed to capture relevant geospatial data. These tools can now be integrated and work with QGIS as a way to interface with QGIS while you are on their mobile device.

Two popular tools that do this are QField, developed by OPENGIS.ch, and Input, developed by Lutra Consulting. These tools are very similar and both work off project files in QGIS so that they can work with and synchronize with a QGIS project. Both the tools are available on Android devices, while Input is also available in iOS.

воскресенье, 18 августа 2019 г.

Dual-Frequency GNSS – An important location feature your phone is probably missing

It’s not something you often think about, but location services are probably one of the most-used features on your smartphone. A multitude of apps—from Pokémon GO to Snapchat—rely on your location to personalize your experience and provide you with more features. Of course, this goes beyond just casual app usage. Accurate location is everything when you’re driving around a big city looking for a parking space. Unfortunately, when it comes to the vast majority of modern devices, accurate location is not something you can be 100% sure of.

Single vs. Dual-Frequency GNSS

Your phone determines its position by listening to radio signals from satellites in outer space, or Global Satellite Navigation Systems (GNSS). The norm in today’s smartphone market is single-frequency GNSS. In essence, what this means is that your smartphone tracks a single radio signal from each satellite. However, single-frequency GNSS is prone to multipath errors. Multipath errors occur when a signal bounces off of large objects such as buildings, resulting in multiple “echo” signals reaching the device. This can result in inaccuracies of around 5 meters. In real-world terms, what this means is that in big cities, your mapping app may not be able to tell exactly which street you’re on. While better quality antennae can be more accurate, it’s common for your phone to report incorrect locations in built-up areas due to multipath errors.

So how does dual-frequency GNSS rectify this issue? The short answer is two is better than one. Instead of relying on just one signal to determine your location, devices track more than one signal from each satellite, each on a different radio frequency. For Americans with the GPS systems, the frequencies are called L1 and L5. For Europeans with the Galileo satellites, the frequencies are called E1 and E5a. While most current devices only use the L1/E1 frequency, dual-frequency-enabled devices make use of both. The L5/E5a signals are more advanced, and thus less prone to multipath errors. They can be used to refine position accuracy to as low as 30cm (versus the 5m mentioned earlier).

пятница, 22 сентября 2017 г.

Двухчастотный "сантиметровый" гнсс чип для мобильных устройств

Broadcom Limited (NASDAQ:AVGO), a leading designer, developer and global supplier of a broad range of digital and analog semiconductor connectivity solutions, today announced the world’s first mass-market, dual frequency GNSS receiver device, the BCM47755, designed to enhance location based services (LBS) applications for mobile phones, tablets and fitness wearables. Equipped with the latest GNSS innovations, the device is capable of centimeter accuracy with minimal power consumption and footprint, enabling an entirely new suite of high-precision LBS applications including lane-level vehicle navigation and mobile augmented reality (AR).

Until now, mobile location based applications have been powered by single frequency GNSS receivers operating under stringent battery power and footprint constraints. The expanded availability of L1/E1 and L5/E5 frequencies in satellite constellations enables the use of two frequencies to compute position much more accurately in both urban and open area environments. The BCM47755 delivers this higher level of location accuracy while meeting the rigorous battery power and footprint needs in mobile phones.

четверг, 1 января 2015 г.

CREDO_DAT MOBILE

CREDO_DAT MOBILE

ОСОБЕННОСТИ СИСТЕМЫ:

отсутствие ограничений на формы и методы создания обрабатываемых сетей геодезической опоры;
количество обрабатываемых (принимающих участие в уравнивании) пунктов планово-высотного обоснования – не более 20 (на платформе Android), не более 30 (на платформе Windows Mobile), количество обрабатываемых точек тахеометрии – не ограничено;
возможность оперативного подключения чтения новых форматов файлов электронных регистраторов и тахеометров.

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