International Research Journal of Engineering and Technology (IRJET)
e-ISSN: 2395 -0056
Volume: 04 Issue: 05 | May -2017
p-ISSN: 2395-0072
www.irjet.net
ENERGY EFFICIENT in GPS SENSING Vijayalakshmi S MTech (Part Time) Final year Student Dept. of Electronics and Communication Engineering, SRM University, Kattankulathur-603203, Kanchipuram Dist., Tamilnadu. India ---------------------------------------------------------------------***---------------------------------------------------------------------
b) 50 % of PWM is applied to GPS module to save 50 % of energy from normal uses
Abstract - Location is a fundamental service for mobile
computing. Typical GPS receivers, although widely available for navigation purposes, may consume too much energy to be useful for many applications. So here focusing to consume less power energy and at the same time geolocation and time of GPS should get updated. Reducing the ON timing thereby reducing the energy efficient of the GPS module in any application. By keep it on for 50% and off for 50% pulse width modulation signal as a input to GPS from the Microcontroller and can able to reduce the power consumed by GPS module. In addition it can be able to track a person location and additional information tracked based on enhancement of this module
1.2 Limitations a) Many mobile sensing applications are delay-tolerant. Instead of determining the location at the time that each data sample is collected, we can compute the locations off-line after the data is uploaded to server. This is quite different from the turn-by-turn b) The benefit is even more significant if the data uploading energy is amortized over many data samples. c) Much of the information necessary to compute the location of a GPS receiver is available on line. d) Code phases can be derived from any millisecond of satellite signal. If we can derive location without decoding any data from the satellites, there is significant opportunity to duty-cycle the receiver. e) Comparing the constraints on processing power and energy consumption, storage is relatively cheaper to put on sensor devices, so we can store raw GPS Intermediate Frequency (IF) signals together with sensor data.
Key Words: GPS, Microcontroller, Pulse width Modulation,
1. INTRODUCTION Fundamental principle for mobile computing is location based service. Typical GPS receivers, although widely available for navigation purposes, may consume too much energy to be useful for many applications. Location information can be post-processed if data is uploaded to a server, we design a cloud-offloaded GPS solution that allows a sensing device to aggressively duty-cycle its GPS receiver and log just enough raw GPS signal for post-processing.
2. System Description The module consisting of Arduino Uno microcontroller, used to control entire operation. GPS module consists of receiver and a transmitter which can provide the exact location. Intel Lumisense Board (IOT) device which supports both GSM and PC where it can upload the data into the server. LCD display which can display the output of the power consumed. Transformer of 12V which can regulate the uniform power supply. Battery support also provided to ensure the uniform power supply without disruption.
Main reasons for the high energy consumption of GPS receivers: 1) the time and satellite trajectory information (called Ephemeris) are sent from the satellites at a data rate as low as 50 bps. A standalone GPS receiver has to be turned on for up to 30 seconds to receive the full data packets from satellites for computing its location. 2) The amount of signal processing required acquiring and tracking satellites due to weak signal strengths.
Below are the Block Diagram for Energy Efficient in GPS sensing.
Leveraging available information such as Location based Services (Cellular Tower), a cloud service can derive good quality GPS locations from a few milliseconds of raw data.Using our design of a portable sensing device platform in hardware board, we evaluate the accuracy and efficiency of the solution.
1.1 Objective a) Controlling the power signal applied to GPS so that we can save energy and it can be used by some other modules in our application.
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Fig 1: Block Diagram of system
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