Questions tagged [gps]

stands for Global Positioning System, a satellite based navigation system

34 questions with no upvoted or accepted answers
Filter by
Sorted by
Tagged with
6
votes
1answer
463 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 ...
3
votes
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 ...
3
votes
0answers
73 views

Intermittent control signal injection clock sync

I have a big challenge in my design to overcome: I need clock frequency accuracy of <0.2ppm with incredibly low power consumption. What we are doing currently is, using a 3G transceiver' baseband ...
2
votes
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 ...
2
votes
1answer
148 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: ...
1
vote
0answers
99 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
vote
1answer
86 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 ...
1
vote
0answers
122 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 ...
1
vote
1answer
575 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. ...
1
vote
0answers
480 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 ...
1
vote
0answers
203 views

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 ...
1
vote
0answers
429 views

GPS current consumption is not reducing Why?

I have interfaced l80 gps module to my pic24f microcontroller . This controller works under 3.3v and gps at 3.3v . The total current consumption is 27 to 28 mA it takes . After sending the command as ...
1
vote
0answers
402 views

Shared feed/GND pad on Pulse W3011 antenna

This is my first post; sorry if I've unwittingly broken any rules or accepted conventions around here... I'm using a Pulse Engineering W3011 ceramic GPS antenna. As is common with these small ceramic ...
1
vote
0answers
498 views

Isolation between GSM and GPS antenna

We are doing a prototype for a gps based tracker. We got a problem in placing the GSM and GPS antenna. Both the GSM and GPS antenna are omni-directional antennas. In forums and application notes, the ...
1
vote
0answers
63 views

The best components for a hybrid positioning system

I am stuck and need some extra brain power. I am attempting to build a grid of sensors with a trackable object...constrained to an X-Y plane, AND the object that is being tracked must be done so ...
0
votes
0answers
64 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-...
0
votes
0answers
35 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 ...
0
votes
1answer
70 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
votes
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.
0
votes
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 ...
0
votes
0answers
32 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 ...
0
votes
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
votes
0answers
229 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 ...
0
votes
0answers
149 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
votes
0answers
25 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!
0
votes
0answers
34 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 “+...
0
votes
1answer
96 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 ...
0
votes
0answers
78 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 ...
0
votes
3answers
434 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 ...
0
votes
1answer
460 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
votes
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 ...
0
votes
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 ...
0
votes
2answers
86 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. ...
-3
votes
1answer
257 views

Trying to find documentation on UNV-SIM7100C-EVB MINI-V1.11

As the title states, I have the UNV-SIM7100C-EVB MINI-V1.11 connected to my Nucleo-F401re board and am trying to get GPS working. Can anyone help? EDIT: I'm looking for the one bought from here: ...