Questions tagged [gps]

stands for Global Positioning System, a satellite based navigation system

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3
votes
1answer
318 views

Is using a shorter timer period less accurate than using a longer one?

I'm using a dsPIC 33FJ128GP804 and I'm trying to record data at 200 Hz as accurately as possible. My device also has a GPS and I'm noticing that my timer is drifting compared to the GPS by about 333 ...
4
votes
2answers
1k views

Garmin Gps Battery Modification

I recently bought a GTU 10 from Garmin. I want to extend it's battery life by replacing and soldering on a new battery and enclosing the battery and the GTU 10 in a 1601 Otterbox. I would like to be ...
2
votes
1answer
950 views

What is the talker ID of this GPS receiver?

A popular GPS communication protocol is the one specified by NMEA (see here). Communication is done in "sentences", which start with $-- where ...
5
votes
2answers
19k views

Using a GPIO pin as a power source

I have an STM32F2 (reference manual here) which is connected to a GPS receiver through 5 pins. One of these pins is a power supply pin for the GPS. All pins on the micro-controller are GPIO pins that ...
2
votes
3answers
998 views

GPS Data Accuracy on Inclines

I have a BU-353, and I am using it in a car. I want to use it to get a more accurate speed reading than RPM/wheel diameter calculation can give me. I am wondering how the incline of a slope, that the ...
27
votes
10answers
76k views

Why do GPS receivers have a 1 PPS output?

I was surprised to see that the GPS receiver I'm working with has a pin reserved for outputting a 1 PPS (Pulse Per Second) signal. What is the point of this? Can't the microcontroller easily ...
2
votes
2answers
14k views

Is it possible to use 2-way walkie talkie to locate position?

Basically, given no GPS is allowed, can we use walkie talkie to locate the position of a car / a person? I am assuming the walkie talkie is using radio, not GPS-based. What equipments will be ...
3
votes
6answers
3k views

Indoor Location Positioning

We are developing a mobile application for smartphones (Iphone, Android, BlackBerry, etc) and want to allow navigation at indoors. We can buy and place indoor gps antennas but will this solve our ...
13
votes
13answers
11k views

What can I use to detect pinpoint location (inches) outdoors?

I am getting back in to EE after some time so please excuse my ignorance. I am looking for a way to detect pinpoint location outdoors to navigate a robot for a project with my sons. Is there a low ...
2
votes
3answers
2k views

How to connect GPS module to usb cable

I need help with connecting this module with USB cable or serial cable. What do I need to connect? What channels? EDIT: Okay guys I see that you think that this gps in not so good. How about this ...
13
votes
4answers
2k views

How does the GPS scale and deal with potentially millions of requests per second and respond in real time?

Nowadays almost everyone who have owned a smartphone or some type of GPS device somewhere. These devices also seemly update in real time. How is the GPS satellite capable of responding to potentially ...
0
votes
1answer
2k views

Generating SMPTE time code signal

SMPTE signals are (one of) the signals used to synchronize video and audio recordings from multiple cameras/recorders. How does one go about generating such a signal? I have a GPS-derived clock and ...
7
votes
2answers
344 views

Where does GPS interference such as that from Lightsquared come from?

A recent government test shows LightSquared products affected 75% of GPS receivers on adjacent frequency bands. Is this most likely because (a) the Lightsquared transmitters bleed over onto the wrong ...
3
votes
2answers
3k views

LM317 Voltage of 1.8v

I want to get 1.8v to power a gps unit, from the 5 volt pin of an Arduino. What do I need to change on this schematic to achieve that voltage?
2
votes
2answers
2k views

Powering 1.8v GPS with Arduino

I want to purchase this new GPS on sparkfun, but I have no idea how to get the correct supply voltage (1.8vdc) for it from the Arduino. 48 Channel GP-2106 SiRF IV GPS Receiver Datasheet
5
votes
1answer
3k views

What is the major technological change that has dramatically improved GPS acquire time?

What has allowed us to go from a unit (eTrex for example in year 2000) that would take many minutes to acquire GPS lock and be unable to do so indoors, to a modern android phone that will lock in a ...
-1
votes
7answers
553 views

Using RFID to secure and prove ownership of a stolen vehicle

Long story short: They stole my bike. This is the fourth one; apparently it doesn't matter how well you secure it, if they want it, they'll take it. Now, the police actually caught them after a ...
2
votes
5answers
541 views

GPS and Communication (802.11, BT, GSM/GPRS, etc.) ICs

I'm trying to do the preliminary proposals for a small, low power, low cost unit that is capable of reporting it's location to a central service. These devices will generally be in a small urban area,...
5
votes
3answers
3k views

Inductor and capacitor for GPS antenna

I'm working with the Venus 634FLPx GPS chip. The reference schematic in the datasheetincludes an inductor L1 marked "optional biasing for active antenna": What ...
9
votes
6answers
13k views

Resistors in series with Tx and Rx

I'm making my own board and using an ATmega 328 with the Arduino bootloader. I have a DIP switch to select either an FTDI chip (for programming) to be connected to the ATMega's Rx and Tx, or a GPS ...
3
votes
1answer
825 views

What is the GPS Hotfix Feature?

I'm finding that some GPSs (e.g. Garmin nüvi 2300) have a "HotFix" feature that causes satellite connections to be made more quickly. How does this feature work? Is it internet/WiFi-based, is it ...
1
vote
3answers
3k views

Looking for a cheap cellular modem chipset + GPS [closed]

I'm looking for advice about available cellular modem chipsets, my main concerns being power consumption followed reliability & then by weight/size. It can be the worst-performing chipset in the ...
0
votes
2answers
618 views

How much current does this device draw?

I am using a GPS device. I'm told it's a WD-G-ZX4120, but on the actual device it says it's an ET-318. I heard from somewhere that this device uses 100 to 150mA. However the datasheets seem to say ...
0
votes
2answers
133 views

Velocity showing in GPS-Navigation Systems

How exact is the velocity that is showing in a GPS Navigation System like Navigon or TomTom?
75
votes
5answers
35k views

How many GPS channels make sense?

You need 4 channels to determine your position (including elevation), and I can understand that a few extra channels increase accuracy. However, there are maximum 12 satellites in view at any time, so ...
9
votes
3answers
2k views

GPS Units - Weather Balloon

I have a problem concerning GPS units. I have been studying on a project for a weather balloon which will go about 30 - 40km up. Now I do know that some GPS units have a limit on how high they can ...
2
votes
2answers
2k views

How do i navigate RC car with a gps module on it from point A to point B?

I want to navigate the RC car from point A to point B. The gps module is used to find the current location coordinates i.e point A. The user enters the point B coordinates based on point A. I am ...
3
votes
1answer
626 views

GPS module(GMS-U1LP) setup help

I just brought GPS module "Global-Top GMS-U1LP". I want to setup it for its UART configuration. In data-sheet there are 4 different ground but I am not able to trace which ground corresponds to which ...
4
votes
1answer
2k views

Suggestion for a GPS module with helical/omnidirectional antenna [closed]

I'm looking around for a decent GPS module for a project of mine. The Sparkfun GPS Buying Guide is nice, but focuses mostly on modules with patch antennae. My project is a wrist- or upper-arm-mounted ...
3
votes
2answers
869 views

customize server in GPS Tracker

Is there any GPS tracker available in which I can set server's location (some IP) to which that device will send notifications (GPS data). I want to create my own GPS receiver server.
0
votes
2answers
1k views

Arduino GPS shield giving incorrect altitude readings

I've been playing around with an Arduino and the SparkFun GPS shield. For about a week, it was working well, but it has now developed an interesting error. While my latitude, longitude, date, time ...
8
votes
5answers
4k views

Is passive GPS retransmission possible?

Is it possible to passively pipe GPS satellite signals indoors via a waveguide, or 2 antennas connected by a coax? If so, with what type of waveguide, antennas, coax, etc. should I try and experiment?...
3
votes
6answers
3k views

Making a plastic card that looks like a credit card with a long-range module inside

Does anyone know how I could make a card the size of a credit card with something like a GPS/bluettoth/RFID module that could be detected from a relatively long range. The purpose is to see where this ...
1
vote
2answers
1k views

Arduino + MAX232 + Pharos GPS360

I'm working on getting an ATMega168 to talk to my GPS that I ripped out of the casing from Microsoft Streets and Trips. I know it talks RS232 @ 5v (according to this post) and I just need to listen on ...
3
votes
2answers
3k views

GPS Data logger using MSP430

I'd like to make a GPS logger. I've got a GPS from Microsoft Streets and Trips. I read that it communicates at 4800 baud over RS232 at 3.3 or 5v. I've got an MSP430G2231 from the launchpad kit and I'm ...
5
votes
3answers
430 views

GPS Suggestions

I have decided to play in the world of GPS modules. I have read the GPS Buying Guide from Sparkfun, but still am not sure which unit I want to go with. I am leaning toward the LS20031, do any of you ...