stands for Global Positioning System, a satellite based navigation system

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1answer
55 views

Unable to receive GPS data from Quectel L80 GPS module

I have a Quectel L80 GPS module with PIC24fj128ga202. I am using UART2 to get GPS data from the module and I transfer the received data to hyperterminal, using UART1. Between PIC and PC I there is an ...
2
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0answers
23 views

Is GNSS S/N equivalent to C/N?

I work in developing software that integrates with GPS receivers. I've struggled for years with inconsistencies in documentation for the NMEA emitted by such receivers, and I've decided to put it to ...
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1answer
77 views

How would you jerry-rig an android phone for continuous autonomous operation?

I want to use an android phone as dash-cam with GPS tracking capabilities. It is supposed to run 24 hours a day, 365 days a year. If the phone / app hangs, the user cannot be expected to ...
21
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4answers
3k views

True GPS Location - At the Antenna or Receiver Chip?

Suppose I have a GPS unit attached to an antenna through a 50 meter coax cable. How would the location as calculated by the GPS unit be affected by the cable length? As a bonus question, how would ...
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1answer
37 views

Reducing GPS coldstart if we know where the user is

I'm working on a project with GPS and I was wondering if it would be possible to reduce the cold start time by passing in some data. Let's say I already had a fairly good idea of where the user was ...
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1answer
63 views

Can I create paths to two external GPS antennae but use only one

I am making a PCB for a SIM968 GSM/GPS device. Printing PCBs in my country is expensive. I am making this PCB for two different purposes. One is to work in an open environment where there is enough ...
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1answer
157 views

SIM908 GPS STATUS “Location Unknown” Error

I'm using a SIM908 module on a custom board and am having trouble getting the GPS location from it. Everything else works on the module. I can send SMS, make calls and send and receive data from a ...
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1answer
95 views

GPS is not responding [closed]

I have a skylab skg13bl GPS module. I interfaced it with arduino using the TTL, the status LED is not blinking and the GPS module is returning erroneous data. Here is my code: ...
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0answers
49 views

Raspberry Pi + GPS + Arduino Shield

I have this GPS module and an arduino shield for the raspberry pi from Cooking Hacks. See link: https://www.cooking-hacks.com/gps-shield-for-raspberry-pi My raspberry pi B+ is fully updated i have a ...
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1answer
143 views

Getting GPS coordinates with GPRS/GSM module

I'm trying to understand if I can get GPS coordinates using only a gprs/gsm module. Probably I can do it by triangulation using BTS on the terrain and based on the RF signal but is that possible? ...
0
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1answer
29 views

GPS Transmitter Help

I'm starting a project in which I want to be able to attach a GPS module onto a drone in case the drone falls out of sight. I have a few questions as I'm researching parts for this. My ideal specs: ...
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1answer
86 views

Help to understand/ explore small sized 3G and GPS Antenna Design

I recently came across an exciting device called Automile, from Sweden and what caught my eye is this - I am really impressed by the packaging and overall quality of hardware integration they have ...
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2answers
58 views

With regard to GPS signals, what is the significance of I-parts and Q-parts of Complex signal?

What is the significance of I-part & Q-part magnitudes and imbalances in the screenshot? They are listed next to the red Complex signal diagram. Imbalance of I-part: 4.7% Imbalance of Q-part: ...
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1answer
46 views

How can I objectively compare TCXO performance?

I would like to evaluate an alternate TCXO used in a GPS receiver circuit. Our current TCXO works good but I'm looking to test a lower cost alternate. The alternate part is Epson TG - 5035CJ / CG / ...
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0answers
43 views

Complex system circuit design and simulation

I'm building a solar powered GPS tracking device using an Ieik Mini Nano V3.0 Atmega328p microcontroller board (based on Arduino Nano), Adafruit Fona GSM module, Ublox NEO-6M GPS module. The GPS ...
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1answer
120 views

GPS gives weird characters when powering my ATMEGA328 on and off?

i got a problem with my GPS controlled by ATmega328, when i download the code using arduino ISP the GPS works fine and the lcd displays correct data, but when i remove the power from the atmega328 and ...
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1answer
271 views

How can I accurately estimate the power consumption of a GPS tracking device?

I'm building a solar powered GPS tracking device using an Ieik Mini Nano V3.0 Atmega328p Board (based on Arduino Nano), Adafruit Fona GSM module, Ublox GPS module. The GPS module will transmit ...
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1answer
107 views

Parsing GPS data? [closed]

I wrote a code to simulate receiving NMEA string from my GPS, but faced a problem in parsing the latitude, longitude and date, i want to know what is the problem with the code . here is my code : ...
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3answers
372 views

What makes this active antenna “active?”

I'm using a external taoglas GPS/Glonass active antenna. It has a male SMA connector and I don't see where any voltage source hooks up to thing. So how is it active? Or does the power required for the ...
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0answers
15 views

Microwave frequency carriers and aperture error

In GPS and GNSS (global navigation satellite systems) engineering, one of the things we care very much about is the phase of the signal carrier. These are all microwave band signals. Typical sampling ...
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0answers
82 views

Crash dumping and signal not acquiring by VK16E GPS module

I am new to gps. I have bought VK16E gps module to interface it with Arduino Uno. But before that some problems occured and I am still unable to resolve them. I am using Windows 7 (64-bit) and ...
2
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1answer
253 views

Why does this BGA component have a keep-out layer?

I've pulled the Telit GE864-GPS (datasheet) from the Altium vault. The footprint has a keep-out layer, which prevents me from placing tracks to any pad without using vias. As the pitch is 2.5mm the ...
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0answers
75 views

How to power an IoT (w/gps module) bracelet?

I'm trying to build a bracelet that has IoT (internet of things capabilities). I am currently prototyping with a spark core and using its wifi module to hit a server. While this works great with a USB ...
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2answers
262 views

GPS in combination with servo on Arduino

Me and my friends are building a boat which needs to steer towards certain coordinates. We have a GPS and a compass on board. We have written code which calculates the direction that the boat has to ...
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59 views

Sim908: altitude, strange value

sending the command for receive the GPS information AT+CGPSINF=0 the SIM908 return this format: AT+CGPSINF=0 ...
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1answer
134 views

Duplicate RX in uart (two devices listening one of which is data-logging)

I am not too familial with UART yet, and was wondering if I could some how duplicate the stream of information going to a microcontroller from a GPS. My application will be using a msp430g2553 ...
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6answers
419 views

Reradiating antena for GPS

I need to test and maintain a batch of devices which contain GPS modules. I can work on the rest of the device, but when it comes to test the GPS part I have no signal on my desk, no matter how near I ...
2
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4answers
221 views

In a gps receiver, how is the delay of the signal in the antenna lead allowed for?

In a gps receiver there is an inevitable time delay in the signal travelling in the antenna lead to the circuitry of the receiver. In a typical 5 metre lead the delay is about 15 nanoseconds, which, ...
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1answer
694 views

How big a ground plane does a gps antenna need?

How big a ground plane does a gps antenna need? I am using a GPS puck antenna that has a magnetic base to hold it on to, typically, the roof of a car. I would like to use it from my room at home, on ...
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0answers
111 views

Where I can get NMEA data dump of GLONASS or GPS simulator?

For my graduation work and my open source project about detection of «spoofing» GPS and GLONASS signal I need NMEA data dump of GPS/GLONASS receiver which receive signals from GLONASS or GPS ...
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2answers
75 views

Building a vehicle tracking device

I need to build 100 coach tracking devices. I am a web/mobile programmer, not an engineer, so I'm going to be looking at outsourcing for this. To outsource this work however I should know the ...
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0answers
168 views

Disc golf disc tracker gps [duplicate]

I've done a bunch of searching and can't find any info! I want to put a small tracking device on the bottom/center of a disc for disc golf. It needs to be light in wieght so that it will not mess up ...
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58 views

Voltage Across Patch Antenna and Power Output

I'm modeling a patch antenna using two copper plates (ground plane and patch), ceramic in between the copper plates, and a lead connecting the patch and ground plane that runs through the ceramic in ...
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1answer
87 views

U-blox 6 GPS module why does it still display points every second when set to 5 minutes?

I'm trying to set up a U-blox 6 GPS module with an Arduino. In order to save power I have tried to reconfigure it using the U center to search for a fix only once every 5 minutes. I have read the ...
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1answer
162 views

Can RFID technologies replace GPS for location/positioning applications? [closed]

I'm looking into a hobby project that would require a central interrogation device querying other devices for their location, as well as other metrics. This central device needs to know exactly where ...
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0answers
82 views

Shared feed/GND pad on Pulse W3011 antenna

This is my first post; sorry if I've unwittingly broken any rules or accepted conventions around here... I'm using a Pulse Engineering W3011 ceramic GPS antenna. As is common with these small ceramic ...
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1answer
84 views

A-GPS, cell tower, and provider service

I am not sure if I used the right forum to ask this question. If it is wrong, please point me the right one. I understand in general how A-GPS works with cell towers, and how it depends on the data ...
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2answers
107 views

Antenna phase shift

My question is regarding RF measurement systems which use antennas signal arrival time as principle of operation e.g. GPS. It is known that impedance of well-matched antenna immersed in lossy ...
1
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1answer
120 views

Dual GPS Antenna Connection to Possitioning Module

I am using a Positioning module that has a SMA port to hot plug an SMA antenna. It also has pins available through its foot print to connect a GPS Antenna. The module name is SIM908. I was not able ...
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0answers
133 views

Isolation between GSM and GPS antenna

We are doing a prototype for a gps based tracker. We got a problem in placing the GSM and GPS antenna. Both the GSM and GPS antenna are omni-directional antennas. In forums and application notes, the ...
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2answers
89 views

GPS data meaning

I got this data from GPS module. $GPRMC,235316.000,A,4003.9040,N,10512.5792,W,0.09,144.75,141112,,*19 $GPGGA,235317.000,4003.9039,N,10512.5793,W,1,08,1.6,1577.9,M,-20.7,M,,0000*5F What is the ...
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0answers
47 views

Low Accuracy GPS/Low Detection (e.g. detect country or state)

I'm making something to go with an electronic compass so I can always point to a certain (non-true north) location. To do this, I want to detect what state the user is in, and look up an approximate ...
2
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2answers
222 views

Inductor burning out in a GPS bias tee circuit

I've got a tracking device that uses a Telit GE864-GPS combined GSM/GPS module. The GPS antenna is connected to the Telit module via a bias tee circuit, as shown below: ...
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1answer
57 views

10 MHz frequency standard input

Many sampled data systems accept a 10 MHz frequency standard. I'm designing a sampled data system, and would like to include the ability to lock to an external clock reference. I've seen many ...
2
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2answers
272 views

Does an antenna work inside a plastic box

I need to put two antennas for GSM and GPS communication on my PCB. My final product will be embedded in a user-friendly plastic box with buttons, leds and switches. I have not choosed yet which type ...
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0answers
92 views

Easy-to-use Antennas for beginners

I am designing an embedded system with a GPS and a GSM modules both from the u-blox company. I need external antennas for my GSM and GPS modules. From what I see when I looked for antenna integration ...
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2answers
190 views

Material that Degrade GPS Signal Reception

Between clear tempered glass (see through,thick & very strong) Vs. coloured plastic material, which would result in more degradation of GPS signals if used to make a box? The box contains a ...
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2answers
701 views

Use of the GPS 1PPS feature in a system

I'd like to know how synchronization between the GPS unit and any other sensors is done in a typical system. I understand that the 1PPS signal plays an important role. Could anyone give me a very ...
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3answers
515 views

GPS Antenna | When is an Active Antenna really Necessary?

Many vendors provide positioning modules that support active antennas as well as ones that don't. I am using 4 positioning modules out of which 3 of them support active antennas and the other , CC4000 ...
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2answers
150 views

GPS & GLONASS systems Antenna Selection

It is known that GPS satellites transmit information in the frequency 1575.42MHz MHz while GLONASS satellites transmit information at the some other 1602.0 MHz. How come most GNSS module makers say ...