Microsoft Research does Cloud-Offloaded GPS

Dec 25, 2012 by Nancy Owano weblog
Overall results from 6 locations. The shadow is 100m in diameter. Credit: Microsoft Research

(Phys.org)—GPS reduces battery life in a smartphone or tablet, a problem that has challenged a team led by principal researcher Jie Liu at Microsoft Research. Liu has said in the past that sensing and energy are emerging cross-cutting concerns in computer systems. "The proliferation of embedded and personal devices such as networked sensors and mobile phones gives computer systems increasing capability of gathering data from and adapting to the physical world and personal activities."

At the same time, energy constraints at different scales can affect battery life "and thus user experiences in embedded devices, and can be a limiting factor for the growth of IT infrastructure," he said.

How to serve up sensing data and at the same time reduce resource consumption has become a research task for Liu and co-workers. His group conducts fundamental and systems research on sensing and energy-efficient computing.

Addressing the GPS , Microsoft Research is using a concept for location services that involves offloading some of the data and calculations to consume far less power.

They have offloaded some of the work to the cloud. Their collects only a few milliseconds of information from satellites. The information is combined with information from public, online databases to calculate the device's past locations.

"We built an using WWVB [the station used by radio-controlled clocks in North America to synchronize themselves] time synchronization and a GPS front end," according to the team. "On this platform, sensing a takes more than three orders of magnitude less energy than GPS on mobile phones," they stated. They moved to offload some of the work to the cloud, naming their platform, CLEO (Cultivating the Long tail in Environmental Observations).

"Typical , although widely available, consume too much energy to be useful for many applications. Observing that in many sensing scenarios, the location information can be post-processed when the data is uploaded to a server, we design a Cloud-Offloaded GPS (CO-GPS) solution that allows a sensing device to aggressively duty-cycle its GPS receiver and log just enough raw GPS signal for postprocessing."

They said that by leveraging publicly available information such as GNSS satellite ephemeris and an Earth elevation database, a cloud service can derive good-quality GPS locations from a few milliseconds of raw data.

They presented their research in Toronto at the ACM Conference on Embedded Networked Sensor Systems (SenSys). Their paper was titled "Energy Efficient GPS Sensing with Cloud Offloading," by Jie Liu, Bodhi Priyantha, Ted Hart, Heitor Ramos, Antonio A.F. Loureiro, and Qiang Wang. Their study was awarded Best Paper at the conference.

They said the reference platform consists of a GPS receiver (Maxim MAX2769), a microcontroller (TI MCUMSP430F5338), a WWVB receiver module for time synchronization, and a serial flash chip for storage and glue logic. In addition, the platform has a solar cell, a thin-film Micro-Energy cell battery, and a Hi-Jack inspired audio communication port. An 8Mbit flash enables storing up to 1000 GPS sample points. "The goal of the design is to demonstrate the low energy consumption per GPS sample."

Explore further: Tiny UAVs and hummingbirds are put to test

More information: Research paper (PDF)

Related Stories

Low-energy GPS sensing looms large

Dec 11, 2012

Location sensing has become ubiquitous—it's present every time you turn on your smartphone or engage your car's navigation system. It's also become critical to a variety of outdoors and remote research ...

GPS satellites get a serious upgrade

Apr 22, 2011

(PhysOrg.com) -- GPS has become such an integral part of the new technology in our lives that we really do not give it much of a thought. It gets us to our destination without getting lost. It helps the ambulance ...

GPS Angel: Red Light and Speed Camera Warning System

Dec 16, 2008

(PhysOrg.com) -- The all new GPS Angel Red Light/Speed Camera warning system is designed to warn you of red lights and fixed speed cameras. It's completely road legal and easy to use, just simply place it ...

GPS Jamming Devices Pose Many Threats (w/ Video)

Feb 25, 2010

(PhysOrg.com) -- The latest GPS jamming devices are now being used by car thieves in the UK to render stolen cars and trucks undetectable by law enforcement. These devices also pose a threat to airlines and ...

Recommended for you

Comfortable climate indoors with porous glass

1 hour ago

Proper humidity and temperature play a key role in indoor climate. In the future, establishing a comfortable indoor environment may rely on porous glass incorporated into plaster, as this regulates moisture ...

Crash-testing rivets

2 hours ago

Rivets have to reliably hold the chassis of an automobile together – even if there is a crash. Previously, it was difficult to predict with great precision how much load they could tolerate. A more advanced ...

Customized surface inspection

2 hours ago

The quality control of component surfaces is a complex undertaking. Researchers have engineered a high-precision modular inspection system that can be adapted on a customer-specific basis and integrated into ...

Sensors that improve rail transport safety

2 hours ago

A new kind of human-machine communication is to make it possible to detect damage to rail vehicles before it's too late and service trains only when they need it – all thanks to a cloud-supported, wireless ...

Tiny UAVs and hummingbirds are put to test

19 hours ago

Hummingbirds in nature exhibit expert engineering skills, the only birds capable of sustained hovering. A team from the US, British Columbia, and the Netherlands have completed tests to learn more about the ...

User comments : 0