Questions tagged [gps]

stands for Global Positioning System, a satellite based navigation system

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3answers
652 views

Clock of GPS receiver

As I understand, GPS is supposed to work because : You have 4 (or more, but let's say 4) satellites whose clocks are extremely highly synchronized (through atomic onboard clocks) You have a receiver ...
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1answer
103 views

Do I need a dummy load for a GPS satellite signal generator?

I'm in the process of applying for an FCC experimental certificate so I can be legal when I purchase a satellite generator. I found a used (calibrated) generator on eBay and want to know if I need a ...
3
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1answer
589 views

What is the meaning of the term “Ground Paddle” in the context of ORG1411 PCB design?

I am designing a breakout-board style PCB for prototyping an ORG1411-PM01 module and am unsure about how to meet the datasheet's layout recommendation for the "ground paddle"? The Reccomended PCB ...
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1answer
254 views

What is the importance of an “RC filter array” in GPS module circuit design?

I am in the process of designing a breakout-board style PCB for a project that uses the ORG1411-PM01 module (datasheet here:https://www.origingps.com/wp-content/uploads/2016/11/Nano-Hornet-ORG1411-...
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1answer
149 views

Can I use GPS to synchronise two pieces of hardware? [duplicate]

I'm working on a project with multiple sensors. These sensors need to be synchronised with eachother as precisely as possible without a physical connection. I need to make sure that if I tell them to ...
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2answers
1k views

Can I connect GPS module (NEO-6m) to bluetooth module HC-05 directly?

Since I have poor GPS reception in my car I thought I could forward GPS data from GPS module to a phone via bluetooth. I am using NEO-6M GPS module and HC-05 bluetooth module. At first I was ...
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3answers
248 views

Is an external oscillator for MAX2769 GPS receiver needed?

I am designing an RF frontend for GPS using MAX2769 chip. However, due to lack of theoretical and practical background in signal processing, I am unsure how to interpret the documentation when it ...
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0answers
189 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 ...
2
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2answers
743 views

1PPS signal from GPS: do the electrical connections need special treatment?

I have an arduino (interrupt pin) listen to the 1PPS signal from this GPS (from the Adafruit ultimate GPS breakout). However, sometimes it doesn't pick up the signal. Occasionally, I've been able to ...
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1answer
428 views

What kind of start is good for GPS modules used in Tracking

I came across Cold start,Warm start and Hot start in GPS Modules while developing code for a GPRS Tracker. I know the difference between them. But when I use hot start method,signal is acquired faster ...
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3answers
8k views

How do GPS satellites refresh their clocks

How do GPS satellites keep their on board clocks accurate? I assume that they need to get update from a base station. But how do you make sure that after the update all the satellites are synchronized,...
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1answer
139 views

Kalman filter in GPS watches [closed]

I have a simple question that I don't seem to find anywhere, do typical GPS watches only use GPS data or do they also use other sensores and fuse the information with a Kalman filter? What is usually ...
2
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2answers
639 views

How and where to add a dc blocking capacitor for a gps loop antenna?

I have a SoM (Snapdragon 820) on a development board . I want to test a loop gps antenna(Antenova-Bentoni-SRFG017-MHF4). I need to add a blocking capacitor to be able to make it work.Where /how can i ...
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2answers
3k views

Ai Thinker A7 module does not lock GPS

I am using A7 module from Ai Thinker for GPRS and GPS. However, what I notice is that, The A7 module does not lock GPS When the GPS application on Android Phone shows 13 detected GPS satellites, the ...
2
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2answers
868 views

GPS Receiver RSSI

I am in need of a chip that is capable of both receiving GPS NMEA sentences and reading raw RSSI/signal strength values in the L1 GPS band (1575.42 MHz). I've read through the datasheets of the GPS ...
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3answers
1k views

GPS Patch Antenna Feed Pin PCB Layout

On a PCB a GPS patch antenna should be placed. The antenna feed pin goes through the board and is soldered on the bottom side. On the PCB top layer is a ground plane. My problem is now to define the ...
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2answers
386 views

Methods of sending GPS position [closed]

I'm trying to figure out possible methods in sending GPS location in my project to the server and one possible option is still mystery to me. I hope someone will be able to clarify it. The most ...
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0answers
300 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 ...
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2answers
129 views

Making a GPS Tracker

I've been looking for a fun project to do and wanted to make a GPS tracker like this: https://www.cooking-hacks.com/documentation/tutorials/geolocation-tracker-gprs-gps-geoposition-sim908-arduino-...
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3answers
331 views

Really small tracker using wifi only?

does anyone know if it is possible to buy or build a really small tracker that uses wifi only. I'm hoping to begin a masters studying bats, possibly in China, I expect in China the areas that the ...
3
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3answers
372 views

Count cycles from oscillator clock to get time

first time on stackexchange, hope I'm in the right place. I am working on a project where I need to timestamp an event (which will be detected from an electrical pulse) down to a few tens of ...
2
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1answer
129 views

Where do companies get miniature GPS electronics from? [closed]

When I look at something like Adafruit's ultimate GPS, it's small, but it connects to "big" hardware, compared to the GPS watches in the store. Where do companies like Garmin or Samsung get the tiny ...
0
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2answers
764 views

Process and store GPS data on MCU

I am currently working on a GPS module from Quectel (L70). I try to interface it with MCU TM4C via UART1 to query some position then store it in the memory of the MCU and then to push those ...
2
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3answers
466 views

Finding true north in UAVs

In my application, I need to find true north direction, for reference purpose. I am having a GPS enabled drone. I have searched over Internet and found that moving in the north direction while keeping ...
0
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1answer
437 views

GPS chip antenna - layout query

This is my first attempt in designing a pcb layout for a gps chip antenna. PCB is two layered. All the components (including the antenna) are on the bottom layer. I have assumed it to be a "co-planar ...
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5answers
3k 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 ...
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2answers
764 views

GPS time accuracy (SIM808 or similar) - process between NMEA sentences and AT command response

In an SIM808 chip or similar you can get the GPS information with this AT command: ...
0
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1answer
562 views

Improve Smartphone GPS with external RTK - will a simple antenna work?

Regarding RTK technique, if you have appropriate equipment for full RTK you will have up to cm accuracy. I wondered if we can use very simple external to device antenna (I'm not speaking about Garmin ...
-1
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1answer
371 views

Why do some GPS devices require a GSM SIM-card?

Why do GPS products like [Image A] always require a GSM (or similar; i.e. 3G, 4G, etc.) SIM-card?; Whereas typical in-car GPS navigation devices, etc. like [Image B] don't? [Image A] [Image B]
3
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1answer
2k views

How to simulate GPS signals in my lab?

I work with a lot of field equipment in a university lab; much of this equipment requires GPS signal to work properly. Unfortunately, we have zero GPS reception in the lab where we do all the testing. ...
0
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1answer
95 views

Precision positioning system

I'm looking for a sensor that can track its own position in 3D with an absolute accuracy of around 0.5inch over a 50-100ft area. I think this is better than what GPS or inertial tracking can ...
4
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2answers
515 views

GPS splitter with 200Ω DC load and 50Ω RF impedance on all ports

How can the GPS400 signal splitter provide a \$200~\Omega\$ DC load and \$50~\Omega\$ RF load to GPS receivers on all four ports? Most GPS receiver modules require an active antenna. As a result, ...
0
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1answer
192 views

GPS chip antenna- design query

I am trying to design a gps data logger. I am not able to comprehend the chip antenna layout given here. The pads 1 & 2 in the layout share the same terminal? Isn't it same as connecting the feed ...
7
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2answers
2k views

Can I “integrate” the data from an accelerometer to record a motion trajectory?

I would like use an accelerometer equipped device to record a motion trajectory, as high-resolution and low-noise as possible. For instance, let's say I run a jogging route of 6 kilometres, returning ...
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3answers
163 views

How accurate is a single GPS at detecting distance traveled?

I read that consumer grade GPS is accurate 5-10 meters at resolving global positioning coordinates. However, my question is how accurate is consumer grade GPS at detecting distance traveled. For ...
0
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1answer
40 views

Lightweight battery replacement for GPS [closed]

I've been using a 12V, 7Ah sealed lead acid battery for my GPS equipment, but need something lighter. The battery(s) will be charged daily. Does anyone have suggestions for a battery or battery ...
-1
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1answer
74 views

how to turn of stereo when buzzer is activated

I have a GPS geo-fence warning system that activates a buzzer alarm when the vehicle enters a area it should not. The problem is if you are playing the stereo loud we can not hear the buzzer so what ...
9
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5answers
646 views

GPS for Cubesats - is 8km/sec too fast for consumer chips?

Satellites in low earth orbit are moving close to 8km/sec. Most consumer-grade GPS chips still invoke the CoCom limits of 1000 knots, about 514 m/s. CoCom limits are voluntary limits for exports that ...
8
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2answers
2k views

66 GPS channels for 22 satellites - why the factor of 3?

Modern GPS chips can use signals from many satellites at the same time to obtain a solution. While typically 4 are necessary, a larger number helps improve the solution with some types of errors. As ...
0
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1answer
158 views

Soldering a GPS antenna to a Samsung Tab 2

I want to solder a GPS antenna to a Samsung Tab 2 tablet. I need it to increase its signal and because I have a bunch of them laying around. My question is, what should I connect where, and if I ...
0
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1answer
474 views

Will my car's AM/FM antenna boost the signal of a tablet/carputer GPS?

I'm installing an Android tablet as a carputer in my '97 Hunk-o'-Junk Crapwagon, and saw a reddit post detailing a carputer install where OP linked his Jaguar's antenna to a USB GPS adapter. OP also ...
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1answer
2k views

GPS Accuracy - is it relative or absolute?

If a GPS unit reports accuracy to 1 meter, does that mean that the receiver's absolute location at any time could be up to 1 meter incorrect in any direction, -or- does it mean that the initial ...
2
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2answers
650 views

Does A-GPS require a GPS antenna?

I have a good understanding A-GPS functionality. I understand that assisted GPS is used to improve TTFF, works better indoors but costs more as you are using the mobile networks to determine the ...
0
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1answer
1k views

Measuring vehicle's forward and lateral acceleration using a smartphone

I want to measure the acceleration (forward and lateral separately) using an android smartphone device in order to be able to analyse the driving behavior. My approach would be as follows: 1. ...
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2answers
84 views

Transmit location data globally [closed]

While looking at products like: https://www.victorinox.com/global/en/Products/Travel-Gear/Accessories/CheckSmart-Luggage-Tracker/p/601169 This product is able to send some data about the location/...
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1answer
82 views

Gps l2 frequency Usage

Hı, Does gps l2 frequency signal, carrying p code, can be used without permission of US. If not how dual frequency gps receiver decrypt p code. I mean what is authorization process software or ...
2
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1answer
1k views

How to get sub-meter or centimeter GPS accuracy?

I'm thinking about building a gps system for a tractor. The gps receiver can be placed on the roof of the tractor to minimize interference. Regular GPS receivers are accurate upto "a few meters". (...
0
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1answer
151 views

Add ufl connector to internal patch antenna

Hey i am using Ublox neo 6m gps for some project and it has a U.fl connector and i dont have an antenna for it.I went to buy it and shopkeeper game me an ceramic internal antenna with a pin at its ...
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1answer
197 views

Why is GPS module acting strange?

I am working on a Arduino based quadcopter. The Arduino being used is a Blend Micro. Not shown in the following diagram are 4 infrared sensors, 1 ultrasonic sensor and a 9 axis accelerometer. The ...
5
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1answer
415 views

Why is it that the bandwidth of a patch antenna decreases with it's size?

I typically use a larger (25 mm) patch antenna in GPS/GLONASS receiver circuits. As you probably know, L1 bands for GPS and GLONASS are separated by roughly 25 MHz. For applications where I want to ...