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Questions tagged [gps]

stands for Global Positioning System, a satellite based navigation system

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1answer
143 views

Adafruit Ultimate GPS sendCommand

EDIT: Solved, Problem was with not sending "\r\n" at the end of the sentence. I'm trying to control Adafruit Ultimate GPS through STM32F407, there is an official Arduino Library and this library has ...
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0answers
433 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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2answers
229 views

PCB layout for chip antenna

I recently made my first PCB. I ordered it from China and soldered it up on my homemade oven, and it's working awesome. I've already started a list for rev 2. There is one issue that I'm hoping I ...
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1answer
223 views

Can every L1 GPS/GLONASS/BeiDou GNSS antenna receive E1 Galileo too?

I want to buy a survey grade single frequency L1 GPS/GLONASS/BeiDou/Galileo GNSS antenna (survey antennas have a ground plane built in). I found a product that specifies it is a GPS/GLONASS/BeiDou ...
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1answer
173 views

Blocking DC power to active GPS antenna

I would like to connect two GPS receivers to a single active antenna letting the DC voltage form only one receiver to reach the antenna. In this blog post the guy made his own RF part by putting a ...
0
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1answer
62 views

GPS and PIC16F876A

I am trying to configure a GPS receiver with PIC16F876A. In the code below i am receiving characters from UART, and checking whether received character is $. If ...
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4answers
190 views

Receive GPS Antenna and cable simple confirmation of operation

I am in need of testing a GPS antenna and cable assembly after installation at a reasonable cost. I have a GPS antenna installed on an airplane, then the coax cable from the antenna goes down to the ...
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2answers
332 views

GPS Antenna Testing

I want to test my GPS antenna. The problem is that my test setup is inside the room and not near to the window. It is not getting locked. Now as the setup has several connections, I can not take my ...
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2answers
376 views

Impedance matching: L-network or micro strips?

I'm trying to embed a u-blox neo6m gps module to an stm32 controlled board. I'm planning to connect the module to an SMA connector and use a 50ohm antenna. The datasheet of the neo6m states that the ...
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2answers
101 views

Optimal sensor for measuring object velocity in an open area?

I am trying to measure vertical and horizontal speed of an object attached to a parachute. It will be launched from a low altitude and in an open area, allowing satellite GPS lock. Data treatment ...
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1answer
264 views

What is the difference between GPS and GNSS? [closed]

I'm looking for a GPS module for my project but I've found some modules with GNSS what is the difference between GPS and GNSS? What module do you recommend I'm using BLE? Thanks
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1answer
211 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: ...
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5answers
2k views

GPS QA during manufacturing

Testing and integration engineers on electronics.stackexchange How do you quality check if a GPS module and its subsystems are up to the mark during manufacturing? ...
3
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1answer
488 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 ...
0
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1answer
672 views

What is GNSS EPO orbit prediction in SIM868?

I'm little bit confused about the purpose of GNSS EPO orbit prediction functionality in SIM868 over a hot start,cold start or warm start. I'm working on a GPS tracker project and which among the ...
0
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2answers
181 views

Does GPS module need a wireless service? do I have to pay a service to get my gps module working?

Hi I'm new in the GPS world, I'm looking for a GPS module to track X amount of object the question is do I have to pay any service (cellular, data,etc) to get my gps working? I'm sorry for the dumby ...
0
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1answer
108 views

Converting 5v to 3.3V for GPS purpose while keeping noise at the lowest

I'm trying to create a very simple module that consist in powering a GPS ublox - NEO-M8U - with a micro USB & using an active antenna. Later on, I will add more features but I just want to make ...
3
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1answer
1k views

SIMCOM vs UBLOX [closed]

I would like to know what are your thoughts on the following below. I am designing a GSM tracking device with a SIMCOM808 module and I am speaking to an antenna supplier that advises me to rather go ...
1
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2answers
773 views

NMEA via RS232 and PPS (TTL) splitter

I have GNSS device that outputs NMEA messages via RS232 PPS signal via a digital out (TTL) I need to distribute both the RS232 and the PPS signal to more than 1 system (currently 3, but could be ...
0
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1answer
69 views

GPS antenna of a phone works even it is placed inside, but why its not working indoor

Sounds blunder, but trying to figure out how. I have heard its best to have line of sight to sky for GPS receivers to work. But in phones it could be on back side or in the PCB itself (I guess). So ...
1
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1answer
681 views

Why time period of GPS PPS signal is not accurately equal to 1 second. (7 to 10 mirco sec less)

I've multiple nxp K60 controller running at different ppm crystals. All have a GPS modules, i want to adjust their clocks using pps signal from gps. Whenever K60 controller will start it will adjust ...
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1answer
263 views

Is it posible to use AM/FM antenna as GPS antenna? [closed]

Having installed a tablet (Nexus 7) in the car dashboard, the GPS receiving signal seems to be too weak (specially in places with lots of buildings/trees around). So I thought about opening the tablet ...
3
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0answers
104 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
112 views

Can a GPS receive its signal from within the engine compartment of a vehicle [closed]

I want to place the GPS and GPS antenna inside the engine compartment of a vehicle. Will the device acquire an accurate fix?
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3answers
78 views

Theory: Creating “LPS” transmitter for GPS receivers

As I understand it, GPS works by having transmitters with known locations send a timestamp, and calculating the time it took to receive it, so that you can triangulate your own position, (essentially ...
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2answers
147 views

Can someone check this so I don't fry someone's gps/transponder?

I am helping someone out over at aviation stack exchange -- they want a signal led for their gps receiver to do a preflight check to make sure it is working. They basically want to be able to press ...
81
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6answers
14k views

Why does smartphone GPS find its position much faster than a GPS module?

When I'm using the arduino GPS module it usually takes a couple of minutes for it to start sending data. And it seems that it's usually the case with all GPS modules since they need to "listen" to the ...
0
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2answers
120 views

Choosing hardware for an RF application [closed]

My goal is to build a battery powered RF transmitter that will reach its accompanied receiver through trees, tall grass, brush, and some outside terrain at a reasonable distance (up to a couple miles ...
2
votes
2answers
142 views

Inaccuracy in the GPS data

How can I get the inaccuracy associated with the GPS data. For example when I read lat, lon, speed, heading data from a GPS receiver, how can I get an approximation on the inaccuracy that is ...
3
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2answers
340 views

Disciplined oscillator using counter+micro

I am working on implementing a disciplined oscillator to increase the accuracy and long-term stability. The oscillator would be a VCTXO running at about 25 MHz. My thought is to have a 32-bit counter ...
3
votes
1answer
948 views

How to tune GPS Antenna with a PI circuit and spectrum analyzer?

I am designing a wearable product that uses GPS. In prototypes up to now we have used a patch antenna, and it worked great, however in this revision to cut down on size, we put in a chip antenna, ...
0
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1answer
548 views

Connecting Garmin 18x 5hz GPS to PC via Serial TTL-232 USB cable

I want to connect Garmin 18x 5hz GPS (this) to computer via FTDI Serial TTL-232 USB Cable (this). But once I try to update the GPS via Garmin updater, I get framing error. "A communications error has ...
2
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1answer
477 views

Ground Planes on GPS receiver Module

I want to ask some questions: Is it true that having a large ground plane may help reduce noise? How? I want to design a GPS receiver and from the design guideline, under the module they put a ground ...
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1answer
100 views

Latitude and Longitude DMS conversion in MPLAB XC8

I am using two function for lat and long DMS conversion. when I am using those two function ,either lat or lon is display correctly in my UART.when If i will print latitude first in UART,displaying ...
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0answers
90 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 ...
2
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1answer
368 views

High precision distance between two GPS devices (may be GNSS-SDR)

I wish to get to high precision distance between 2 not moving points. e.g. 1 cm accuracy for distance 1 km I think if I will catch same GPS signal in two points then distance between resulting ...
0
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1answer
93 views

Why services that need to receive a signal, like Bluetooth or GPS, drain cell-phone battery?

The title is self-explanative. This is an emprically contrasted fact for cell phones, although I don't know why this happens. As far as my understanding goes the signal receiver is a passive ...
0
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1answer
91 views

What exactly would be the problem with a small amount of ferrous material inside a QFH GPS antenna?

This video describes the construction of a home-made QuadriFilar Helical (QFH) antenna for a GPS receiver module. A few seconds after 04:00 the narration says: ...
1
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1answer
123 views

Venus GPS 1PPS configuration

I have a Venus634LPx GPS on a breakout board from SparkFun. Read more about it in my previous question. The configuration program gives me the option to configure "1PPS Timing": Here I can choose ...
1
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1answer
353 views

GPS pinning parameters

I have a Venus634LPx GPS on a breakout board from SparkFun. The documentation is very cryptic, so I did not manage to configure it manually through the UART (although I can read data from it). ...
0
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1answer
951 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 ...
0
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1answer
114 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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2answers
692 views

Periodic waking up from deep sleep

what are the main used ways of how to handle deep sleep of some microcontroller (atmega or a cortex m0/m0+) with waking up periodically? Right now, I'm building a Sigfox GPS tracker that should send ...
0
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3answers
946 views

What is the difference between cheap and expensive GPS receivers? [closed]

The cheapest class of GPS receivers is what we all have inside our smartphones etc. Then we have devices like this U-blox. In the end there are professional GPS like this SPAN combined with INS (IMU)...
2
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1answer
250 views

What are some ways to isolate a TTL serial GPS device from high frequency noise caused by a processor and other peripherals?

I'm trying to interface a GPS receiver with a Minnowboard Turbot Single Board Computer via a ttl serial UART on the boards expansion header but there is a substantial amount of noise on the UART and ...
1
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1answer
432 views

How to implement GPS tracking cheaply [closed]

What would be the most practical and cheap way for me to implement a GPS tracker in an ebike I'm working on, so that I could track it on my phone or an online service in case it is stolen or displaced....
0
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1answer
708 views

What is the best way to evaluate GPS antenna performance by receiver data only?

I'd like to test GPS Antenna performance, but I don't have access to any expensive RF equipment. What is the best way to evaluate GPS antenna performance by using only standard NMEA sentence type ...
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2answers
6k 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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0answers
201 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 ...
1
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0answers
463 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 ...