Questions tagged [gps]

stands for Global Positioning System, a satellite based navigation system

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273 views

What is the difference between GPS and GNSS? [closed]

I'm looking for a GPS module for my project but I've found some modules with GNSS what is the difference between GPS and GNSS? What module do you recommend I'm using BLE? Thanks
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2answers
4k 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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5answers
2k views

GPS QA during manufacturing

Testing and integration engineers on electronics.stackexchange How do you quality check if a GPS module and its subsystems are up to the mark during manufacturing? ...
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1answer
1k views

How to tune GPS Antenna with a PI circuit and spectrum analyzer?

I am designing a wearable product that uses GPS. In prototypes up to now we have used a patch antenna, and it worked great, however in this revision to cut down on size, we put in a chip antenna, ...
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1answer
527 views

Ground Planes on GPS receiver Module

I want to ask some questions: Is it true that having a large ground plane may help reduce noise? How? I want to design a GPS receiver and from the design guideline, under the module they put a ground ...
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2answers
768 views

How and where to add a dc blocking capacitor for a gps loop antenna?

I have a SoM (Snapdragon 820) on a development board . I want to test a loop gps antenna(Antenova-Bentoni-SRFG017-MHF4). I need to add a blocking capacitor to be able to make it work.Where /how can i ...
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1answer
288 views

What are some ways to isolate a TTL serial GPS device from high frequency noise caused by a processor and other peripherals?

I'm trying to interface a GPS receiver with a Minnowboard Turbot Single Board Computer via a ttl serial UART on the boards expansion header but there is a substantial amount of noise on the UART and ...
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1answer
113 views

Converting 5v to 3.3V for GPS purpose while keeping noise at the lowest

I'm trying to create a very simple module that consist in powering a GPS ublox - NEO-M8U - with a micro USB & using an active antenna. Later on, I will add more features but I just want to make ...
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1answer
1k views

SIMCOM vs UBLOX [closed]

I would like to know what are your thoughts on the following below. I am designing a GSM tracking device with a SIMCOM808 module and I am speaking to an antenna supplier that advises me to rather go ...
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3answers
4k 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 ...
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1answer
737 views

Why time period of GPS PPS signal is not accurately equal to 1 second. (7 to 10 mirco sec less)

I've multiple nxp K60 controller running at different ppm crystals. All have a GPS modules, i want to adjust their clocks using pps signal from gps. Whenever K60 controller will start it will adjust ...
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2answers
2k 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 ...
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1answer
71 views

GPS antenna of a phone works even it is placed inside, but why its not working indoor

Sounds blunder, but trying to figure out how. I have heard its best to have line of sight to sky for GPS receivers to work. But in phones it could be on back side or in the PCB itself (I guess). So ...
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4answers
4k views

GLONASS and GPS satellite usage simultaneously by Positioning Modules

Can a GPS module use 2 GPS satellites and 2 GLONASS satellites to obtain a fix without using all satellites of the same kind? I know that we cannot force this to happen but is it theoretically ...
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1answer
419 views

GPS pinning parameters

I have a Venus634LPx GPS on a breakout board from SparkFun. The documentation is very cryptic, so I did not manage to configure it manually through the UART (although I can read data from it). ...
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1answer
139 views

Venus GPS 1PPS configuration

I have a Venus634LPx GPS on a breakout board from SparkFun. Read more about it in my previous question. The configuration program gives me the option to configure "1PPS Timing": Here I can choose ...
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1answer
375 views

Is it posible to use AM/FM antenna as GPS antenna? [closed]

Having installed a tablet (Nexus 7) in the car dashboard, the GPS receiving signal seems to be too weak (specially in places with lots of buildings/trees around). So I thought about opening the tablet ...
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2answers
126 views

Can a GPS receive its signal from within the engine compartment of a vehicle [closed]

I want to place the GPS and GPS antenna inside the engine compartment of a vehicle. Will the device acquire an accurate fix?
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10answers
84k 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 ...
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3answers
81 views

Theory: Creating “LPS” transmitter for GPS receivers

As I understand it, GPS works by having transmitters with known locations send a timestamp, and calculating the time it took to receive it, so that you can triangulate your own position, (essentially ...
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6answers
15k views

Why does smartphone GPS find its position much faster than a GPS module?

When I'm using the arduino GPS module it usually takes a couple of minutes for it to start sending data. And it seems that it's usually the case with all GPS modules since they need to "listen" to the ...
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2answers
153 views

Can someone check this so I don't fry someone's gps/transponder?

I am helping someone out over at aviation stack exchange -- they want a signal led for their gps receiver to do a preflight check to make sure it is working. They basically want to be able to press ...
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2answers
127 views

Choosing hardware for an RF application [closed]

My goal is to build a battery powered RF transmitter that will reach its accompanied receiver through trees, tall grass, brush, and some outside terrain at a reasonable distance (up to a couple miles ...
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2answers
149 views

Inaccuracy in the GPS data

How can I get the inaccuracy associated with the GPS data. For example when I read lat, lon, speed, heading data from a GPS receiver, how can I get an approximation on the inaccuracy that is ...
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2answers
367 views

Disciplined oscillator using counter+micro

I am working on implementing a disciplined oscillator to increase the accuracy and long-term stability. The oscillator would be a VCTXO running at about 25 MHz. My thought is to have a 32-bit counter ...
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1answer
740 views

Connecting Garmin 18x 5hz GPS to PC via Serial TTL-232 USB cable

I want to connect Garmin 18x 5hz GPS (this) to computer via FTDI Serial TTL-232 USB Cable (this). But once I try to update the GPS via Garmin updater, I get framing error. "A communications error has ...
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1answer
107 views

Latitude and Longitude DMS conversion in MPLAB XC8

I am using two function for lat and long DMS conversion. when I am using those two function ,either lat or lon is display correctly in my UART.when If i will print latitude first in UART,displaying ...
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0answers
91 views

GPS coordinates display at UART in Degree minutes seconds format

I am receiving coordinates from my GPS module like mentioned on below. uint8_t *latPtr = tmpPtr + 1; when I am writing latPtr value in UART I can view lat value ...
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1answer
469 views

High precision distance between two GPS devices (may be GNSS-SDR)

I wish to get to high precision distance between 2 not moving points. e.g. 1 cm accuracy for distance 1 km I think if I will catch same GPS signal in two points then distance between resulting ...
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1answer
95 views

Why services that need to receive a signal, like Bluetooth or GPS, drain cell-phone battery?

The title is self-explanative. This is an emprically contrasted fact for cell phones, although I don't know why this happens. As far as my understanding goes the signal receiver is a passive ...
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1answer
1k views

SIM808 can't get GPS fix on custom board

I have designed a board with SIM808 which is connected to the 32-bit microcontroller. There is some extra power circuitry on board - MPPT switching converter. Distance from switching controller to ...
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1answer
128 views

What exactly would be the problem with a small amount of ferrous material inside a QFH GPS antenna?

This video describes the construction of a home-made QuadriFilar Helical (QFH) antenna for a GPS receiver module. A few seconds after 04:00 the narration says: ...
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1answer
394 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 ...
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2answers
663 views

GPS splitter with 200Ω DC load and 50Ω 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, ...
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2answers
4k views

Ai Thinker A7 module does not lock GPS

I am using A7 module from Ai Thinker for GPRS and GPS. However, what I notice is that, The A7 module does not lock GPS When the GPS application on Android Phone shows 13 detected GPS satellites, the ...
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1answer
110 views

Do I need a dummy load for a GPS satellite signal generator?

I'm in the process of applying for an FCC experimental certificate so I can be legal when I purchase a satellite generator. I found a used (calibrated) generator on eBay and want to know if I need a ...
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2answers
752 views

Periodic waking up from deep sleep

what are the main used ways of how to handle deep sleep of some microcontroller (atmega or a cortex m0/m0+) with waking up periodically? Right now, I'm building a Sigfox GPS tracker that should send ...
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3answers
1k views

What is the difference between cheap and expensive GPS receivers? [closed]

The cheapest class of GPS receivers is what we all have inside our smartphones etc. Then we have devices like this U-blox. In the end there are professional GPS like this SPAN combined with INS (IMU)...
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1answer
445 views

How to implement GPS tracking cheaply [closed]

What would be the most practical and cheap way for me to implement a GPS tracker in an ebike I'm working on, so that I could track it on my phone or an online service in case it is stolen or displaced....
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3answers
459 views

Count cycles from oscillator clock to get time

first time on stackexchange, hope I'm in the right place. I am working on a project where I need to timestamp an event (which will be detected from an electrical pulse) down to a few tens of ...
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1answer
910 views

What is the best way to evaluate GPS antenna performance by receiver data only?

I'd like to test GPS Antenna performance, but I don't have access to any expensive RF equipment. What is the best way to evaluate GPS antenna performance by using only standard NMEA sentence type ...
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0answers
221 views

What to focus on when looking for a good GPS Antenna?

I am using external active GPS antennas for my application. These Antennas typically have 5m cable with SMA connector that connects to the receiver, while the Antenna is mounted outside. The ...
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3answers
702 views

Clock of GPS receiver

As I understand, GPS is supposed to work because : You have 4 (or more, but let's say 4) satellites whose clocks are extremely highly synchronized (through atomic onboard clocks) You have a receiver ...
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0answers
478 views

Should I be using a Standard Kalman Filter (KF) or an Extended Kalman Filter (EKF)?

So I am trying to implement a Kalman filter for an Inertial Measurement Unit (IMU) using an Arduino. I have 4 sensors: GPS Accelerometer Gyroscope Magnetometer To measure various vehicle properties ...
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1answer
360 views

What is the importance of an “RC filter array” in GPS module circuit design?

I am in the process of designing a breakout-board style PCB for a project that uses the ORG1411-PM01 module (datasheet here:https://www.origingps.com/wp-content/uploads/2016/11/Nano-Hornet-ORG1411-...
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1answer
152 views

Can I use GPS to synchronise two pieces of hardware? [duplicate]

I'm working on a project with multiple sensors. These sensors need to be synchronised with eachother as precisely as possible without a physical connection. I need to make sure that if I tell them to ...
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2answers
1k views

Can I connect GPS module (NEO-6m) to bluetooth module HC-05 directly?

Since I have poor GPS reception in my car I thought I could forward GPS data from GPS module to a phone via bluetooth. I am using NEO-6M GPS module and HC-05 bluetooth module. At first I was ...
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3answers
287 views

Is an external oscillator for MAX2769 GPS receiver needed?

I am designing an RF frontend for GPS using MAX2769 chip. However, due to lack of theoretical and practical background in signal processing, I am unsure how to interpret the documentation when it ...
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2answers
692 views

using mbed with gps

I am trying to program an mbed micro controller to work with a GlobalSat EM 406 GPS receiver and have got it outputting long and lat to a host computer using the information on: https://mbed.org/...
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0answers
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Obtaining GPS Pseudoranges from Code Phase

After the tracking process in a Software GPS receiver, I need to compute the pseudoranges between the receiver and the satellite (without having in mind the clock corrections). In the tracking process ...

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