Questions tagged [gps]

stands for Global Positioning System, a satellite based navigation system

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32 views

Module GSM/GPRS/GPS Vs module GSM/GPRS connected with GPS antenna [closed]

I have a GPS tracker project but I didn't know what to choose a GSM/GPRS module connected with a GPS antenna or a module GSM/GPRS/GPS. For example which is better to use a GPS module neo-6M with a GSM ...
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1answer
36 views

MAX2769 XTAL Reference Frequency

Out of curiosity, the MAX2769 EV Kit uses a 16.368 MHz Rakon TCXO. What would happen if a 16.369 MHz oscillator were used? I realize it would shift the IF, but it would still be functional, wouldn't ...
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70 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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1answer
66 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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68 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
69 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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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
67 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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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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31 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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18 views

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
80 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
163 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
44 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
122 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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2answers
318 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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123 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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22 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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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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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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1answer
90 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
151 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
106 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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2answers
498 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
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
58 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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1answer
89 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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2answers
83 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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0answers
115 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
663 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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2answers
88 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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2answers
49 views

assited gps vs differential gnss [closed]

i am writing as essay evaulating accuracy of smart phone gnsss for GIS data collection for part of the essay i thougt it appropriate to mention DGNSS and Assisted GNSS. So far i understand Assited ...
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3answers
151 views

1PPS vs high resolution timer in CPU

We need to use 1PPS (pulse-per second) in our standalone system which is based on arm processor, and has cameras input. The 1PPS is implemented with GPIO which is injecting an interrupt (low to high)...
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2answers
756 views

How to use 1PPS to Synchronize ESP32 Clocks and Peripherals

I've read a few posts (example) about what the 1PPS signal is and how it can be used at a high-level, but I'm still not sure how to actually implement it on a PCB schematic to sync up with my ...
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1answer
1k views

Lithium ion battery how to connect to PCB? [closed]

I'm planning to use lithium ion batteries to power GPS trackers PCB that I've designed. I'm struggling with how to connect it to my PCB both as a final product and for prototyping? Also are there ...
4
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2answers
1k views

Why is there a diode on the RX pin of the Adafruit Ultimate GPS board?

I can't seem to understand why there is a diode at the Rx pin on this Adafruit Ultimate GPS board. If we are sending data to the GPS, why put a diode that prevents current flow into this pin?
2
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1answer
138 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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1answer
227 views

Struggling with patch gps smd antennas connections

I'm struggling with antenna connections to GPS module in my PCB design. My antenna is a smd passive patch antenna, "SGGP.25.4.A.02 from Taoglas". The antenna shape and recommended footprint is in the ...
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0answers
64 views

Input and Output Impedance of a SAW Filter

I am reading the datasheet of a SAW Filter B39162B4348P810. The datasheet doesn't say much about impedance of Input and Output ...
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3answers
375 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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2answers
3k views

What exactly does C/No (dBHz) mean in u-Blox GPS data?

In this related question I show data collected from a 6.5 hour run from NMEA sentences from a u-BLOX NEO-6 GPS module (datasheet, protocol spec) with an active external antenna via Raspberry Pi. I'm ...
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1answer
167 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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2answers
66 views

Can I use MCU's internal oscillator when communicating with GPS and cellular modules?

Can I use MCU's internal oscillator when communicating with GPS and cellular modules? I want to avoid connecting external crystals for the MCU since they generate noise, extra components, extra costs, ...
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1answer
38 views

How much computing power is required for a GPS Device/Station That Uses L1 and L2C Frequency to Calculate For Ionospheric Delay-Interference? [closed]

I’ve been trying to find GPS chips or devices that receive L1 and L2C and from a quick google search they seem to be very professional equipment, very bulky with huge antennas. This makes me wonder ...
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2answers
173 views

GPSDO in firmware?

There are numerous designs online for hardware GPSDO (GPS-disciplined Oscillators). I'm failing to find any firmware-only implementations. I wonder if my Google foo is weak or if these are impractical ...
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1answer
589 views

Effects of Neodymium magnets on PCB

I'm currently doing a project that consists of: Arduino Nano. Battery. Buck Boost converter. GPS module. TSL2561 light sensor. BH1750FVI light sensors. LSM6DS3 Accelerometer. HDC1080. MicroSD shield ...
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1answer
243 views

GPSDO control algorithm

I am currently building my own GPS disciplined oscillator. I have a OCXO which is used as clock source for a microcontroller and one of its counters, and the 1PPS signal from the GPS module is ...
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1answer
434 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 ...
4
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1answer
196 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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