Gps Definition and 128 Threads

I'm taking driving lessons and can't keep track of the locations I drive around in, so I wish to record my GPS location on a map for later reviewing. What are some good iPhone apps that allow for GPS recording?

Let's say I wanted to create a GPS that gives live feed to a website and mobile application from relatively far away(probably at most a 20-25 mile radius). The GPS should provide ETA, weather status, and live current location. What would I need- mainly for the GPS, but also for the website and...

I was curious about the use of relativity in GNSS (GPS) systems (since I only know very basic relativity but I wouldn't mind having a good excuse to learn more... :biggrin:), and I've found some conflicting results. Some say that the relativistic variations in satellite clock speed have a HUGE...

Hello everyone, Although I am not a physicist, I have been trying to understand the relativity effects on GPS clocks. It's seems pretty logic, however I've stumbled upon on a specific issue: Given a atomic clock without any kind of relativistic adjustment, if the GPS clock is running...

I was planning a trip this summer, and wanted to get a GPS device to help me out. The last trip I took in February, I relied on a map I printed out and a compass. That wasn't easy. And it was hard to find specific locations because the map wasn't detailed enough. And sometimes I'd want to go...

hi, for my project i want to control my robot using GPS system.could i get name of the things what is required to execute this.i have already built a robo now i need to embeded this with GPS . or, please tell me how to implement GPS. thanks in advance.

I had such success with all your answers to my last SRT question here I’ll try another. The LT seems very symmetric. To the observers in each frame, the other’s clocks appear slower, etc. Is that true for out GPS satellites? If we ignore the GRT effect of speeding up their clocks, I think it is...

As far as I understand it... Each satellite transmits a signal that the receiver receives. This signal consists of (at least) a satellite identification together with a time-stamp of when the signal was sent and its position at that time. The receiver calculates the distance from the...

First, the GPS receiver has to "find" at least three satellites. The more, the better. Then, it sends a signal to the satellites and waits for their response. It even records the time between when the receiver sent a signal and when it received the response. In a vacuum, the signals can...

So I understand the basics of the general and special relativistic effects on the speed of the satellite clocks onboard the GPS satellites, and why they are rigged to calculate time slower than an atomic clock at sea level. But then, in several articles, I read that GPS receivers are also...

I was looking through some recent catalogs from electronic stores and a new thing they are trying to hitch is the GPS car tracking devices. There is a major flaw in the system for anonymity, you have to register with a " air time" service to add tracking days and such. For 139 dollars I was...

My task is to estimate / compute accuracy of a gps receiver. My experiment would involve using three GPS receivers and post processing software. following is the nomenclature i would follow for explaining my question. Normal GPS receiver: This is the receiver in test, a simple 12 channel...

Hi there I am a Maths major student with little physics and engineering background. I'm a member of my university's space and astronomy club and we're building a CanSat as a project ( http://en.wikipedia.org/wiki/CanSat ). I have been given the task of mapping the Cansat's coordinates without...

I'm working on a robotics project that I believe could greatly benefit from the use of differential GPS. The robot will be navigating within a known 100m by 100m area and will need to have a positional accuracy of about 25cm. These two things lead me to believe that DGPS is a good fit. I...

I have a GPS track I'd like to plop on top of a map. The region of the track is very small, no bigger than the area of a city. I also have a bunch of shape files to build up a map of the city with all the buildings, roads, etc. in separate shp files. Although the shape files actually contain...

Hi guys, I'm interested in developing a small gps receiver that I can fit into a certain object so that when it gets stolen I can send a text to it, find the coordinates and track it. The sixe of space for the gps device to sit in would be approx ∅30mm, length is not an issue. I am not an...

How accurate does the GPS on your phone tend to be? When I'm outside, under good conditions I can see impressive accuracy, especially considering the precision of the measurements. I walked to the left of a building this afternoon, out by the parking lot. The phone thought I was positioned...

Hello, I am trying to solve a calculus problem, and do not know quite how to approach it. I am doing a project on a GPS track, I have mapped out an area with GPS, the GPX file gives speed, lat, long, time and some other data. I am comparing the area under the curve of MPH(Y axis) and...

The roads in some parts of Seattle may have one, two, or three names. SW 130th may also be 141st ave and is not to be confused with NW 130th or NE 141st. Of course it may also be called by a name like "Main Street" on the map, with the numbered names missing altogether. But the name on the map...

Hello, we try to design and build a sun tracker carrying a plate photvoltaîque, piloted by GPS, GPS must locate the position of the sun and gives an order to move towards this position throughout the day, but we really do not know where to start all your suggestions and ideas will be...

Please help me in removing my mistake, since i see 3 satellite required to locate an place on Earth and synchronization of receiver clock with gps satellite. [ I have assumed at any moment a place on Earth will see certain satellite at a certain distance from it in the sky. That is a...

hi, I know that a GPS receiver module receives a number of signals coming from GPS satellites and the receiver can distinguish between them based on a number 1-32. Is there a limit to the number of signal one can send on a specific carrier frequency? Is there a limit to the number of signals...

Hi, i would like to make an android app and a gps transmitter. Where do i start? (Sorry if this is in the wrong section)

Can someone please shed some light on the exact method for finding the two points at which the spheres created by the GPS signals from 3 different satellites intersect? I have been working on a uni project for 4 days now and still can't get this relatively simple part of my MATLAB code to work...

Today marked a big win for privacy advocates. *The U.S. Supreme Court handed down a ruling on the question of whether it was Constitutional for police to attach a GPS tracking unit to someone’s vehicle without their consent, and without … Continue reading...

Hello, I need to calculate how accurate a GPS system is using only Special Relativity and a very basic knowledge of GR (without tensors...which is limited). I'm not sure where to begin however... where does the uncertainty in the measurement come from? How can I calculate the size of the...

To detect gravitational waves, we set up some probe masses in laboratories far from each other and measure distance between them. Why not use GPS satellites for that? I mean: they have precise atomic clocks, they constantly measure their position relative to each other and they are as far away...

I was watching QI http://www.youtube.com/watch?v=gU7McFm_cKQ&t=7m09s and prof Brian Cox said that time runs roughly 38000 ns per day faster on GPS satellites than on the ground. From that he concluded that since light travels roughly 1 foot per nanosecond, GPS would generate a positional...

with synchronization what the gps receiver does is compute time difference between his current time (synchronized with atomic clock onborad each satellite) and the time tag of a satellite when the signal was sent. This difference gives the travel time of an signal from the satellite and hence...

A previous question that I asked got me thinking about simultaneity, and I have a couple of questions on the subject. Concerning the Einstein's train thought experiment. The observer on the train perceives the lightning to strike the front of the train first. So in his reference frame he does...

I am doing my Extended essay about the maths involved in calculating your position using the GPS. I am reading a very complete book, but the maths are sometimes too hard or not enough deeply explained for my level and I am struggling to follow some parts. Here I post one page of the book where...

I am doing my extended essay on the maths involved in GPS, and I am trying to understand the concept of the group velocity of a wave packet, http://www.mathpages.com/home/kmath210/kmath210.htm" they explain it more or less, but I still don't get how do they differenciate dw/dk to get...

sattelite tick slower than an Earth bound clock. Let's say an atomic clock. From what I've gathered so far, the clock aboard the GPS sattelite ticks slower The sattelite is in free fall so the clock aboard the sattelite is in zero G. Is the zero G condition the only condition that cause...

This is scarey .. http://abclocal.go.com/wabc/video?id=7621105

Hey all, im doing a individual info search on GPS. i can understand everything (well its just a basic overview of GPS) but the one thing i can't get my head around is why the need for a fourth satellite? i know it corrects the timing as the receiver does not have an atomic clock. I've read 4 or...

I am afraid that this is either too specific and\or that this is in the wrong forum (if the latter is the case, if moderators could change this, I'd appreciate :). I'm trying to do an application that uses the GPS data that comes from NMEA files. On a particular sentence (RMC) there is a value...

"GPS" device & connections Instead of using the satellites like Google Maps, is it possible to come up with a device that any device, such as mobile and laptops can connect and communicate with the device? In other words, let say Harvard campus. We know its campus is very large in terms of...

I'm having to do a project and i got to do a detailed presentation describing and explaining the basic physics principals for gps's, tv's and radio. Each section has to be around 3-4 minutes of explanation. Im hitting a big rut with trying to find research for it. Also I am in gr.12 physics...

I've been thinking about picking up a GPS unit. I'd probably use it in my car for driving. I'd like to be able to take it other places (hand-held) such as walking or even sailing. I definitely want to be able to download its data. I think my first two items might be in conflict. Is a car...

I guess GR is also needed to accurately coordinate space flight, but I highly doubt without GR the space shuttle will have any problem finding its way back home. Gravitational lensing doesn't count as practical application. Maybe a subject with even fewer applications is quantum chromodynamics...

Actually, it's not GPS itself which is at fault, but the software or those who use them. http://news.yahoo.com/s/ap/20100102/ap_on_hi_te/us_stranded_motorists" blindly followed their GPS on a shortcut through mountain ranges in the winter and became stuck in the snow. I find that easy to...

Can anyone answer this? GPS satellites are preprogrammed before launch due to relativistic effects mainly time dilation and gravity. Yet, once in orbit, the satellite should view the Earth frame as "moving" and thus apply time dilation to the Earth frame meaning the Earth clocks should beat...

While GPS pseudorange is measured by the satellite and GPS local clock difference (together with some compensations for atmospheric effects), how does a GPS receiver measure the pseudorange rate? Thanks.

Anyone here into sailing or boating? I haven't left my mooring yet, been testing it at anchor but my new Humminbird 383 insists I'm pointing NE when I'm actually pointing SW. It changes its mind every so often, occasionally it's correct, but seems to return to this position. I've left it...

I am trying to see how a GPS works by analyzing the data it collects. Basically, I have the pseudorange, satellites positions and also the GPS receiver location data I got from a GPS, and I was expecting to reproduce the positions reported by the GPS to high accuracy by solving the pseudorange...

Hello, I have recently found an urge to understand the amount of energy that I use while driving. I would like to be able to record tracking data via GPS in a GPX format, and then calculate the amount of energy that would be used to perform the same trip using various vehicle models. I...

Homework Statement - List all nonisomorphic abelian groups of order 2^3 3^2 5 Homework Equations The Attempt at a Solution - Z_2^3 * Z_3^2 * Z_5 = (iso) Z_360. Z_2^3 * Z_3 * Z_3 * Z_5 = (iso) Z_3 * Z_100 . . . I know , but why Z_360 , Z_3 * Z_100 are nonisomorphic to 2^3...

Is there anyone who knows of a tracking device small enough to install inside a notebook/laptop. Apart from RFID tags which only track within a given range. A GPS device that would track an asset as it were a car

The GPS (Global Positioning System) satellites are approximately 5.18 m across and transmit two low-power signals, one of which is at 1575.42 MHz (in the UHF band). In a series of laboratory tests on the satellite, you put two 1575.42 MHz UHF transmitters at opposite ends of the satellite. These...

How does the Global Positioning System compensate for mapping the irregular surface of the Earth relative to its center of mass?