Questions tagged [gps]

stands for Global Positioning System, a satellite based navigation system

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votes
3answers
841 views

Can more than one device read data from GPS?

I have an OSD(atmega88p inside), which is reading data from GPS through serial connection as I understand and I would like to connect second device (FEZ Cerb40) to read GPS data, wondering if that ...
0
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1answer
33 views

Arduino : send data via satellite (or other solutions) without GSM [closed]

I'm a researcher. I'm looking to build a very tiny embedded system with low power consumption. I must send data from the desert and above the ocean. To do that I think that my single option is to use ...
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10answers
88k 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 ...
0
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1answer
70 views

What GPS IC do cell phones use [closed]

I am experimenting using gps devices. I managed to utilize a NEO-6M gps module, but it only works when there is a direct 'optical' connection to a satellite (aka it does not work inside a home, under ...
1
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1answer
138 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 ...
0
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0answers
46 views

Connecting RS232 GPS Board to Raspberry Pi

I purchased a NEO-6M GPS board to connect to my Raspberry Pi, and when I bought it I didn't realize that it was meant for RS-232 communication instead of UART TTL (which I believe is what the ...
0
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1answer
47 views

AVX M830120 SMD GPS antenna problems - cannot get GPS fix on a prototype board, strange S11 measurements

I’m struggling with AVX M830120 SMD GPS antenna in my project. I have used it in prototype board, did PCB layout more or less according to datasheet, and couldn’t get GPS fix no matter what I tried. I ...
0
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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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0answers
33 views

Micro Cat Tracker PCB design

I would appreciate any advice how to improve PCB design to achieve the highest sensitivity for the GPS signal. The design is based on S76G chip. The tracker will be sewn or encapsulated in plastic ...
0
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3answers
569 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 ...
2
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1answer
47 views

GNSS module direct grounding to ESP32 increase sensitivity

I have a simple cirquit that composes of the following : ESP32-DevKit-LiPo (ESP32-WROOM) GNSS Module Beitian BN-357P with ufl connector for external antenna GNSS Active Patch Antenna My simple is ...
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8answers
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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0answers
19 views

IEC60950: cable distribution network definition

The definition of a cable distribution network is given in IEC60950: "mainly intended for transmission of video and/or audio signals between separate buildings or between outdoor antennas and ...
3
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1answer
173 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: ...
0
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0answers
70 views

GPS patch antenna pcb design

could you please review my layout? It's the top side where the antenna is actually placed. It's bottom side, here I've placed a matching network, LNA (U5)2 and SAW (FL1). The length of the trace ...
0
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1answer
26 views

GPS Logger Trigger Circuit Integration

The Arduino UNO and GPS shield logs the coordinates by the use of the trigger inputs. The trigger takes +ve 5 to 15v on a pin. (See Image 1) It is designed to be used to log, each time a solenoid ...
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2answers
119 views

Homemade GPS Receiver: Cascading LNAs and Band-Pass Filters?

Over the last couple of months, I developed a software-defined GPS receiver. Unfortunately, it's not very sensitive, and can only detect very strong satellite signals. For the RF front-end, I am using ...
0
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1answer
499 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 ...
0
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0answers
58 views

3.3V GPS with 5V active antenna bias-tee

I'm building a multipurpose MCU + GPS device and doing breadboard experiments at this stage. The Ublox Neo7 GPS IC is on a breakout board at 3.3V. The board supplies about 3.1V to the antenna which ...
0
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1answer
78 views

GPS antenna reference design

I have to put a GPS antenna on a PCB layout, but not sure how to calculate a matching network, and how to check that it will work correctly. I've chosen components with desired features (radiation ...
0
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1answer
49 views

How do you choose components for a gps antenna

I have to solder an active gps antenna on a pcb. But I don’t know how to choose components. In my case antenna will be used outdoor on a pet collar. First of all there are a lot of different ceramic ...
1
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1answer
620 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. ...
0
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0answers
66 views

Is this circuit correct and will work?

I found this circuit as a gps module on the internet . i look to datasheets and it looks ok. I want to make it for test. is this correct and will work ? Credit: https://www.electroschematics.com/neo-...
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0answers
37 views

Connecting to Venus GPS, checking received UART message, seems garbled

I'm trying to integrate to a Venus VENUS634FLPx GPS chip that I bought through SparkFun many years ago (https://www.sparkfun.com/products/retired/9133). I'm connecting to it through UART and I'm ...
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1answer
79 views

Can two mobile phones accurately sense the distance between themselves?

This question is inspired from covid19 and current attempts to produce a contact tracing app for a mobile phone. Can two mobile phones accurately (+- 1 m over a range 0-100 meters) sense the distance ...
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0answers
42 views

GPS PPS Signal Duty Cycle? [duplicate]

just like the title says, I'm trying to figure out the duty cycle of a GPS's Pulse Per Second Signal. This post and accompanying answers seem to indicate something like a 10% duty cycle: GPS PPS ...
2
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0answers
32 views

Accurate localization through GPS, IMU and odometry

I am trying to localize a robot with an error <1m. I have XA1110 GPS but haven't tested it in an open area (due to the ongoing disaster) hence I am unaware of its practically achievable accuracy. I ...
9
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2answers
2k views

GPS taking long time to fix out in the open

I am trying to use a ORG-1411 GPS (https://origingps.com/products/hornet-org1411/) to get location and UTC fix, using the breakout from Mikroe (https://www.mikroe.com/nano-gps-click). To parse the ...
0
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2answers
82 views

Designing on-chip antenna [closed]

I want to design on-chip antenna (that is, antenna on PCB itself). Is it also called microchip antenna ? Can anyone provide me details and/or steps as to how to design on-chip antenna? How to proceed ...
0
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1answer
83 views

What is the name of antenna and connector in the image

Below is the image of a GPS module. I have highlighted the antenna in the yellow box: What is the name of the antenna in the yellow box (Question 1) ? Is the type of this antenna ...
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1answer
53 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 ...
0
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1answer
105 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 ...
0
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2answers
111 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 ...
1
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0answers
144 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: ...
1
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1answer
95 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 ...
0
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1answer
73 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.
5
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6answers
4k 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 ...
0
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1answer
62 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 ...
77
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5answers
38k 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 ...
0
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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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0answers
40 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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0answers
19 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 ...
0
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1answer
50 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 ...
0
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0answers
369 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
45 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
716 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?
2
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1answer
142 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
227 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 ...
0
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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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