Questions tagged [gps]

stands for Global Positioning System, a satellite based navigation system

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1answer
426 views

Manufacturers' recommendations for ground plane for GPS patch antennas

I see requirements for specific ground plane sizes in many GPS antenna datasheets, but I also see many devices that ship with significantly smaller ground planes. Do these integrators know something ...
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2answers
67 views

CR2032 batteries with Arduino

I'm working on logging GPS values(from u-blox Neo 6m GPS module) to an SD card using an Arduino Pro Mini. The code I'm working with works without any flaw when we connect the Arduino to the laptop ...
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47 views

GPS performance issues with PCB layout with patch antenna

I am having trouble with the reception of my GPS module - a Quectel L76L. I am connecting the Antenna via a U.Fl connector. I know that the issue is somehow due to my layout because it works on a ...
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61 views

How to choose the right ferrite bead for an LDO

I'm trying to design a custom board that will include the FGPMMOPA6H GPS. Looking at the Adafruit integration of this GPS, I can see a ferrite bead on the output of the LDO (MIC5225-3.3). See below: ...
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1answer
65 views

How to find inductance of a burnt inductor of a RF matching circuit

I have an Android headunit for my car with wifi, gps, 3G, etc. At some point the GPS stopped working. I replaced the antenna connector because the pin was bended and could not connect anymore. At the ...
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3answers
351 views

does adding Vias through the antenna feed line change impedance?

I have a GPS through-hole patch antenna, the through hole need to be connected to the bottom layer and then from there the feed-line flows to the GPS receiver. But I want the GPS receiver to be on top ...
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1answer
68 views

Does GPS have a symbol?

I am working on a project that includes a GPS signal. In my electric diagram, do I have to add it? I don't know which is the symbol for that.
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6answers
3k views

GPS PPS signal corresponds to data time?

I currently have an Adafruit Ultimate GPS connected to an Arduino that outputing GPS data (nmea sentences) once per second. There is also a pin on the GPS outputting 1 PPS signal. My question is ...
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1answer
55 views

Adding a transistor to cut the power makes automagically any device more power friendly?

I'm currently designing a device that will be powered by batteries, I'm planning to make the MCU sleep and only wake up a few times a day to read sensor values and go to sleep again, one of the ...
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1answer
131 views

Voltage Regulator for GPS vs. BMP280

I am using the Bosch BMP280 pressure sensor and the FGPMMOPA6H GPS chip together on a PCB. I am using the reference designs from Adafruit's breakout boards for each chip (found via the product links: ...
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5answers
37k 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 ...
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1answer
33 views

Basic design of low-wattage 5V battery charger (is this realistic?)

I'm trying to come up with a solution for keeping a very small GPS tracker mounted someplace where it will stay indefinitely without an external power source. Since my main interest will be using such ...
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30 views

Problem with received GPS data

I am using an mtk3333 to read gps coords. I set nmea messages to only output gll data. The problem is that I am receiving the GLL packets but in this format: $GNGLL,,,,,004912.869,V,N*6D GLL packets ...
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How close can I put my GPS/nb-IoT antennas to my nrf9160 SIP?

I'm designing an asset tracking product that needs to fit in a very compact space. I can just about squeeze the nrf9160 and my two antennas (un-amplified PulseLarsen W3011 for GPS, Taoglas NCP5820 for ...
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1answer
49 views

How can i add an LED for identify working status?

I have a GPS module, it's working well. I integrated it with a STM32, getting latitude and longitude values through UART. How can I connect an LED for indicating the connection status for this ...
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1answer
75 views

GPS active antenna not working

I am currently working on a GPS module tracking a drone-mounted device. I am using the ublox CAM-M8Q GPS module on a breakout board. The internal antenna is working fine, however the signal is ...
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0answers
132 views

How to measure -170 dB GPS signal with spectrum analyzer

I'm looking for a way to measure noise signals (probably MCU harmonics) that affect the performance of my GPS receiver (Ubox sam-m8q-0-10). Can anyone point me to the right direction? I own a ...
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1answer
43 views

GPS module accuracy query

I have a GPS module with an accuracy of 1.5m + 1 ppm. Query: What is meant by 1 ppm accuracy, what does it symbolize?
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1answer
2k 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? ...
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2answers
281 views

How to draw spiral in altium designer?

I need to draw this pinwheel antenna pattern in altium designer. But I have no idea how to do it (drawing spirals) with altium equipments. Do you have any suggestion?
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1answer
119 views

Accidentally connected a GPS antenna to a cellular connector and a cellular antenna to a GPS port. What can go wrong? [closed]

I have two ultra small/sub-miniature coaxial connectors on my circuit board - one for a cellular (4G) antenna and one for a GPS antenna. I accidentally connected the cellular antenna to the GPS ...
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0answers
111 views

PPS Timer on STM32

The MCU used is a STM32F042 which is clocked by an OCXO oscillator (Abracon 10 MHz - 20 ppb). The subject of this thread is to get the best accuracy on one PPS Timer. For my application, I need to ...
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20 views

How to connect GPS tracker (FMB920) to HC05 bluetooth?

I am successfully able to connect my phone to GPS tracker over bluetooth and send commands but was unable to to connect HC05 module to it and communicate over serial. Please help me out of this!
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1answer
1k views

How to install an embedded GPS patch antenna

How should I install an embedded GPS antenna? Here is the antenna in question: the antenna http://www.robotshop.com/media/catalog/product/cache/7/image/800x800/9df78eab33525d08d6e5fb8d27136e95/s/e/...
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3answers
93 views

GPS relative positioning

I have a set of 4 rovers crawling on the ground, each of them equipped with a standard GPS positioning system. The rovers start together from a known position. Each rover is locating itself via GPS. ...
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1answer
132 views

REYAX RYP820U mPCIE (actually USB2) GPS/GLONASS/BeiDou module and PPS

So, I thought I might try to set a time server (as one does). I have a nano ITX mb with a mPCIe slot on it, and I found a GPS card that supposedly outputs a 'timepulse'. It was cheap enough that I ...
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0answers
33 views

SIM868 breakout board does not accept GNSS/GPS AT commands

I bought SIM868 breakout board with GNSS support. https://www.aliexpress.com/item/33013782111.html However, I can’t get coordinates using standard at-command AT+CGNSPWR=1, AT+CGNSTST=1, etc. I get “+...
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2answers
8k views

What is the highest achievable update rate for a civilian GPS receiver?

I'm interested in knowing the maximum achievable update rate for a civilian GPS receiver. Specifically Receivers that depend exclusively on GPS satellites (e.g. not including IMU-based movement ...
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1answer
87 views

Can a patch GPS-antenna be mounted in an inclined position? [closed]

I have just bought Globsat BU353S4 GPS-receiver. Now I have a doubt: it is mandatory to mount it in an horizontal position (i.e. facing the sky) or it can be also tilted of some angle with no ...
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2answers
470 views

Lithium ion (Li-ion) vs. Lithium thionyl chloride (LTC) battery?

I need some consultation on which battery of the two to use for the GPS trackers I'm designing. My trackers wakeup when there's movement only so they're not on all the time and they have low power ...
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1answer
166 views

How to detect potentially poor antenna placement from GPS data?

Below is data from a 6.5 hour run collecting NMEA sentences from a u-BLOX NEO-6 GPS module (datasheet, protocol spec) with an active external antenna via Raspberry Pi. This is my first analysis to ...
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7answers
3k 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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2answers
144 views

Tracing GPS antenna on multi layer PCB

I have been tracing PCB for the first time and came to a few questions regarding GPS antenna selection and placement on PCB. Basically, I am trying to make as small as possible PCB with GPS/GSM modem....
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1answer
99 views

To connect Active GPS Antenna wires on PCBA should Solder or use Connector

Will it make a difference if I solder or use the supplied SMA type connector to connect the wires of Active GPS antenna on PCBA? I am using gps antenna of this type.
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1answer
183 views

Is a voltage level shifter necessary?

I am using an STM32F100xx MCU and I want to communicate via UART with a GPS module, specifically the A7 Thinker GPS GPS Module with A7 Thinker from Aliexpress This module, when a 9V battery is used, ...
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1answer
49 views

General open license PCB GPS antenna

Is there a basic passive GPS reference antenna design that would be considered fair-use or "free to use" that can be placed on a PCB as a strip antenna or patch antenna? I'm looking not to violate ...
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2answers
55 views

How to sync GPS time and pulses of micro-controller

I have two of the devices (a while loop in the code) that need to start at the same time, within 50ms or less of each other. Each is using the same GPS module, and I am using "ARM® Cortex®-M3 Giant ...
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3answers
557 views

Why does Lidar have GPS, serial, and PPS input?

Many commercial Lidar systems have GPS, PPS, and serial interfaces. What's the application and how's it being used?
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1answer
86 views

Bigger GPS antenna better or more efficient?

I have the choice between: 1) 35x35mm GPS antenna 71% efficiency glonass, tested on 70x70 GND plane 60% gps 2) 25x25mm GPS antenna 83% GPS, 84% glonass, tested on 50x50 GND plane I have read ...
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0answers
539 views

What kind of GNSS antenna is this?

I would like to know what types of GNSS antennas are on the images below (patch etc.) and also which one is better from the two (if any). They are being sold as "high precision" survey grade antennas. ...
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1answer
678 views

GPS - Noise Figure Analysis

I am trying to analyze all components in one home-made GPS receiver and I am stuck with figuring out how to determine Noise Figure at the mixer output. See picture below: If we are going from the ...
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2answers
78 views

Software vs hardware-defined GNSS receivers

I am conducting research into the accuracy of smartphone positional fixing accuracy. I have come to understand that smartphones use software-defined receivers rather than hardware-defined receivers. ...
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1answer
151 views

Which Board Should I Use For High Frequency GPS? [closed]

This is a very general question, hopefully with the amount of information I provide you will be able to steer me in the right direction. I am trying to build a very versatile GPS receiver, with ...
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0answers
107 views

GPS PCB RF Design and Performance Impact

I have designed a vehicle tracker for two-wheelers which is installed in 500 bikes. I am facing an issue with GPS performance (lock percentage is quite low for more than 75% bikes). This makes me ...
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2answers
615 views

RF - sma pth connector impedance matching to cpw

I am designing a 4-Layer PCB with an SMT GPS/GNSS receiver (1575.42 MHz), where it connects to an external antenna through an SMA Connector. I have already done all the calculations of CPWG using ...
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0answers
106 views

Running Application on SIM808 GNSS module beside it's internal firmware

I'm trying to load my written program to SIM808 and the module will be responsible for running my program and also its internal firmware. SIMCOM has a document about doing this in SIM800 module but ...
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2answers
83 views

coplanar waveguide vs microstrip for gnss and cellular?

coplanar waveguide vs microstrip for gnss and cellular? I read on internet microstrip is better for signals <30Ghz but some gps manufacturer (Delorme) said that coplanar is most efficient so it's ...
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1answer
192 views

Inductor for a GPS active antenna

I have been testing the GPS / GPRS development module A9G, Aithinker which uses an active GPS antenna, according to the schematic reference diagram, the value of the inductance is 82nH: The question ...
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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 ...
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2answers
889 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.

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