stands for Global Positioning System, a satellite based navigation system

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2
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1answer
68 views

How to simulate GPS signals in my lab?

I work with a lot of field equipment in a university lab; much of this equipment requires GPS signal to work properly. Unfortunately, we have zero GPS reception in the lab where we do all the testing. ...
-1
votes
1answer
55 views

Precision positioning system

I'm looking for a sensor that can track its own position in 3D with an absolute accuracy of around 0.5inch over a 50-100ft area. I think this is better than what GPS or inertial tracking can ...
1
vote
0answers
37 views

GPS splitter with 200ohm DC load and 50ohm RF impedance on all ports

How can the GPS400 signal splitter provide a \$200~\Omega\$ DC load and \$50~\Omega\$ RF load to GPS receivers on all four ports? Most GPS receiver modules require an active antenna. As a result, ...
0
votes
1answer
43 views

GPS chip antenna- design query

I am trying to design a gps data logger. I am not able to comprehend the chip antenna layout given here. The pads 1 & 2 in the layout share the same terminal? Isn't it same as connecting the ...
6
votes
2answers
991 views

Can I “integrate” the data from an accelerometer to record a motion trajectory?

I would like use an accelerometer equipped device to record a motion trajectory, as high-resolution and low-noise as possible. For instance, let's say I run a jogging route of 6 kilometres, returning ...
1
vote
1answer
49 views

How accurate is a single GPS at detecting distance traveled?

I read that consumer grade GPS is accurate 5-10 meters at resolving global positioning coordinates. However, my question is how accurate is consumer grade GPS at detecting distance traveled. For ...
0
votes
1answer
33 views

Lightweight battery replacement for GPS [closed]

I've been using a 12V, 7Ah sealed lead acid battery for my GPS equipment, but need something lighter. The battery(s) will be charged daily. Does anyone have suggestions for a battery or battery ...
-1
votes
1answer
52 views

how to turn of stereo when buzzer is activated

I have a GPS geo-fence warning system that activates a buzzer alarm when the vehicle enters a area it should not. The problem is if you are playing the stereo loud we can not hear the buzzer so what ...
4
votes
2answers
152 views

GPS for Cubesats - is 8km/sec too fast for consumer chips?

Satellites in low earth orbit are moving close to 8km/sec. Most consumer-grade GPS chips still invoke the CoCom limits of 1000 knots, about 514 m/s. CoCom limits are voluntary limits for exports that ...
8
votes
2answers
863 views

66 GPS channels for 22 satellites - why the factor of 3?

Modern GPS chips can use signals from many satellites at the same time to obtain a solution. While typically 4 are necessary, a larger number helps improve the solution with some types of errors. As ...
0
votes
1answer
37 views

Soldering a GPS antenna to a Samsung Tab 2

I want to solder a GPS antenna to a Samsung Tab 2 tablet. I need it to increase its signal and because I have a bunch of them laying around. My question is, what should I connect where, and if I ...
0
votes
1answer
76 views

Will my car's AM/FM antenna boost the signal of a tablet/carputer GPS?

I'm installing an Android tablet as a carputer in my '97 Hunk-o'-Junk Crapwagon, and saw a reddit post detailing a carputer install where OP linked his Jaguar's antenna to a USB GPS adapter. OP also ...
0
votes
1answer
75 views

GPS Accuracy - is it relative or absolute?

If a GPS unit reports accuracy to 1 meter, does that mean that the receiver's absolute location at any time could be up to 1 meter incorrect in any direction, -or- does it mean that the initial ...
0
votes
0answers
40 views

help needed for ublox pcb

I am back to the basic and I want to get I right this time, I am asking to check my prototype of just GPS + patch antenna, I have made a trace of 1 mm width, as I read online about 1.6 mm thickness, ...
1
vote
2answers
105 views

Does A-GPS require a GPS antenna?

I have a good understanding A-GPS functionality. I understand that assisted GPS is used to improve TTFF, works better indoors but costs more as you are using the mobile networks to determine the ...
0
votes
1answer
88 views

Measuring vehicle's forward and lateral acceleration using a smartphone

I want to measure the acceleration (forward and lateral separately) using an android smartphone device in order to be able to analyse the driving behavior. My approach would be as follows: 1. ...
-2
votes
2answers
60 views

Transmit location data globally [closed]

While looking at products like: https://www.victorinox.com/global/en/Products/Travel-Gear/Accessories/CheckSmart-Luggage-Tracker/p/601169 This product is able to send some data about the location/...
-2
votes
1answer
32 views

Gps l2 frequency Usage

Hı, Does gps l2 frequency signal, carrying p code, can be used without permission of US. If not how dual frequency gps receiver decrypt p code. I mean what is authorization process software or ...
1
vote
0answers
35 views

how to sample and modulate a gps gold code

I am trying to simulate the data transmission of a GPS satellite. Telecommunications is not my field so I am struggling a bit with some concepts. I managed to generate the Gold code of the GPS ...
2
votes
1answer
132 views

How to get sub-meter or centimeter GPS accuracy?

I'm thinking about building a gps system for a tractor. The gps receiver can be placed on the roof of the tractor to minimize interference. Regular GPS receivers are accurate upto "a few meters". (...
0
votes
1answer
29 views

Add ufl connector to internal patch antenna

Hey i am using Ublox neo 6m gps for some project and it has a U.fl connector and i dont have an antenna for it.I went to buy it and shopkeeper game me an ceramic internal antenna with a pin at its ...
1
vote
1answer
58 views

Why is GPS module acting strange?

I am working on a Arduino based quadcopter. The Arduino being used is a Blend Micro. Not shown in the following diagram are 4 infrared sensors, 1 ultrasonic sensor and a 9 axis accelerometer. The ...
4
votes
1answer
82 views

Why is it that the bandwidth of a patch antenna decreases with it's size?

I typically use a larger (25 mm) patch antenna in GPS/GLONASS receiver circuits. As you probably know, L1 bands for GPS and GLONASS are separated by roughly 25 MHz. For applications where I want to ...
0
votes
2answers
91 views

MEMS: why INS + GPS? [closed]

I have read in the Internet that in the most cases people prefer using INS (accelerometer + gyroscope) + GPS sensors. I have read they can compensate each other errors, but is it possible to obtain ...
1
vote
2answers
260 views

Any idea on what this component is?

It's an 0402 sized component. Measures about 50 milliohms out of circuit. I also measured it with a cheap LCR meter and it shows -47nH. Capacitance measures 350mF. So I'm pretty sure it's a jumper. ...
4
votes
1answer
34 views

Return current on Adafruit GPS

This might have a dumb answer, but here goes... This is a picture of the u.fl connector on the Adafruit ultimate GPS. With RF lines, I know you want the shortest return path. So why did they put ...
0
votes
3answers
128 views

Does powering a module with 5v instead of 3.3v affect it's logic level? [closed]

I bought a NEO-6 u-blox 6 GPS Module (datasheet, pages 9 and 14), which has a standard serial connection. I have a USB to serial converter, which is 5v logic. This board says it can be supplied 3v-5v, ...
0
votes
1answer
102 views

How to make SirfStar IV chip operate as I2C slave only?

I bought a GPS that has SirfStar GSD4e chipset inside. I see with the logic analyser that when in I2C mode it is writing to the bus. I understand by that that it is in master mode. How can I make it ...
0
votes
1answer
107 views

Generating Hexadecimal checksum for a NMEA (PMTK) message

I am trying to use quectel L80 GPS receiver for my project. I am trying to configure the L80 using the PMTK strings. But the problem is the string should also contain a hexadecimal check sum. eg. $...
7
votes
1answer
222 views

how is the 1PPS signal generated in GPS receivers?

The question might seem stupid, but the time of flight from the satellite is unknown and moving, the doppler effect is skewing the frequency (and is not constant due to the relative trajectory) and ...
0
votes
2answers
196 views

GPS 1 PPS Aligment Clock Signal Generator

i want to do GPS 1 pps aligment clock signal generator. Clock signal should be at 24.576 Mhz and voltage level Vmax= 3.3 V and Vmin=0 V DC. How can i do that? It is very important to align between GPS ...
1
vote
1answer
145 views

GPS Almanac versus Sky Search

The total almanac data is transmitted in 25 navigation messages. Each navigation message takes at least 30 seconds to transmit. So, receiving the almanac data from the satellites takes at least 12.5 ...
1
vote
1answer
69 views

GPS antenna type

i want to interface a gps module and an antenna. I found this kind of antenna (example) It does not mention its type. Is this an active or a passive antenna? How to be able to know by myself without ...
2
votes
1answer
83 views

Is the Garmin GPS 12 on board 16.368 MHz oscillator GPS controlled?

My plan is to use my old Garmin GPS 12 as a frequency standard. As it has no pps (pulse per second) output I am thinking about using the on board oscillator as the clock source. So my question: Is the ...
1
vote
2answers
201 views

SAW and GPS Antenna

I'm designing a system with a GSM modem and GPS receiver. In order to achieve out of band rejection I'm planning on putting a SAW filter right after the antenna. Often on the internet I see a few ...
2
votes
1answer
76 views

GPS RX module Implementation

I have been tasked with designing a low power sensor system and the customer has decided location would be a great option. I have done GPS before but only with complete modules (Ant. + IC). To keep ...
0
votes
1answer
122 views

What type of connector is this Velodyne interface box GPS connector?

Velodyne VLP-16 lidar's interface box has this connector. What type is it? Could not find this from the manual.
0
votes
2answers
445 views

Calculate distance travelled by vehicle using “knots” of NMEA data

I'm using L80 quectel GPS module. Which sends the NMEA protocol data string which has latitude, longitude, UTC time, knots, etc. We are going to use this GPS module in a vehicle. We have to calculate ...
0
votes
1answer
168 views

Antenna gps neo 6m

I am designing a pcb which has the module ublox neo 6m, instead of using the normal antenna I was looking to use a ceramic which should work with ublox. I have got this: http://uk.farnell.com/...
0
votes
2answers
42 views

Ways to communicate GPS coordinates to a central server wirelessly from a wearable device

I am currently looking at designing a wearable device for a client, which can communicate GPS coordinates back to some sort of central server (to then be sent out to other communicating devices such ...
3
votes
2answers
248 views

GPS positioning faster than 1Hz

I am a systems engineer working with various instrumentation devices for ground platforms. These platforms can vary in speed from 0-60+mph. Current instrumentation provides TSPI at 1Hz and is based on ...
-3
votes
1answer
131 views

External GPS antenna for smart phones [closed]

Is there a smartphone GPS boost or external GPS antenna commercially available for smartphones. To hook up to smartphones via audio input for example?
1
vote
1answer
289 views

GPS antenna ground plane design considerations and limitations

I have a PCB design which incorporates a GPS unit. I'm looking at refining the PCB, and I'm looking to do away with the long cable length, occupation of space within my enclosure, current consumption,...
2
votes
1answer
262 views

PIC24FJ128GA202 UART2 and UART3 not working?

I am working in pic24fj128ga202 microcontroller with L80 and M95 module. here L80 module connected with uart2 and M95 module connected with uart3. now uart1 working normally but uart2 and uart3 not ...
5
votes
1answer
350 views

GPS consideration for PCB with GSM (interference, setup etc)

I am working on a project which has a GSM and GPS on the same PCB (fairly near each other in an enclosure). Since I am not familiar with GPS I was wondering if any of you could give me some tips on ...
3
votes
1answer
151 views

How is impedance matching for chip antennas practically done?

I designed a PCB for a GPS tracking device and i want to further develop it to have a smd gps antenna mounted on the board. I know that for optimal signal transfer i need to design a matching circuit, ...
0
votes
1answer
157 views

Is anything wrong with my PCB?

I am designing a PCB and I just want to make sure nothing is wrong before I send it off to the fab house. If one of you knowledgeable stack exchangers could give me some feedback, I would really ...
5
votes
1answer
173 views

GPS Power consumption MTK3339 vs SirfIII for periodic logging application

I am currently working on redesigning a SirfIII based battery operated GPS logger. A MTK3339 based GPS module has been selected due to overall (advertised) performance. The GPS logger uses a ...
1
vote
1answer
134 views

Turning a frequency locked loop into a phase locked loop

I want to use a GPS module (with a PPS output) to ultimately generate a 5kHz timing signal that is phase-aligned with the PPS positive edge. ...
2
votes
1answer
386 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 ...