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Questions tagged [gps]

stands for Global Positioning System, a satellite based navigation system

0
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2answers
61 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. ...
0
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2answers
80 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 ...
6
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1answer
425 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 ...
4
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1answer
118 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 ...
1
vote
1answer
50 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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1answer
69 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
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1answer
216 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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1answer
41 views

GPS start mode query

I am using SIM808 GPS/GSM module. I came across Cold start,Warm start and Hot start in GPS Modules while developing code for a GPRS Tracker for car. I know the difference between them.My question is ...
0
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1answer
108 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 ...
-3
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1answer
193 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: ...
3
votes
0answers
96 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 ...
2
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0answers
469 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 ...
2
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0answers
69 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 ...
1
vote
0answers
58 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
0answers
347 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
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0answers
414 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
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0answers
179 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
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0answers
287 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
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0answers
329 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
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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
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0answers
29 views

Does feedline of through-hole antennas have to be at the bottom?

Does feedline of through-hole antennas have to be at the bottom of the PCB or is it ok to have it on the top? I don't see why it can't be on the top but I read in Taoglas docs that it should be on the ...
0
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0answers
43 views

GPS and Galileo signal reception with a broadband antenna

I have a passive antenna that covers a wide bandwidth (1.25 - 2.45GHz, RHCP, omnidirectional) which I'd like to re-purpose for Galileo signal detection. I don't have an option to get an application ...
0
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0answers
44 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
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0answers
11 views

What is a difference between peak gain & avarage gain of an Antenna? How avarage gain is measured?

What is a difference between peak gain & avarage gain of an Antenna? How avarage gain is measured? For an antenna (e.g. GPS chip antenna) if avarage gain & peak gain given, which value should ...
0
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0answers
84 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
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0answers
167 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 ...