27
votes
Accepted
How do GPS receivers communicate with satellites?
The first thing to know is the communication is one-way. There's a satellite-to-receiver transmission, nothing going in the opposite direction. So your cell phone doesn't have to find the radio power ...
- 386
13
votes
How do GPS receivers communicate with satellites?
The receiver does not communicate with the satellite; it just receives.
Fundamentally, the receiver listens on one or more well-known frequencies. The receiver determines which satellites it can &...
- 1,170
10
votes
How do GPS receivers communicate with satellites?
The other answers already provide very detailed explanations, so I decided instead to suggest a resource which answers your question, but should also be very helpful with your further research:
GPS - ...
- 201
6
votes
What equipment and software do I need to read raw civilian GPS signals on my Mac?
I will answer this question from a "technology of radio" perspective, because half of the question is very much related to the technology of radio. The other half is related to the decoding of a data ...
- 4,669
4
votes
What equipment and software do I need to read raw civilian GPS signals on my Mac?
Start with a GPS receiver that outputs NMEA data. This data will be made available through a serial connection such as RS-232, USB, or Bluetooth. Pick a serial connection that you can use with your ...
- 18.6k
3
votes
Accepted
Why some QO-100 setups use GNSS
I'm not an expert, but to expand on the answer from @Marcus Müller: the GNSS input is used to compensate (or "discipline", hence "Disciplined Oscillator") an internal frequency ...
3
votes
Accepted
Is it possible to transmit telemetry data (GPS) via QRP?
When you ask if a QRP transmitter could be used to solve your problem, I presume that you mean a low-powered transmitter on HF, meaning roughly 3 – 30 MHz. That would solve the problem of ...
- 9,320
3
votes
Total cancellation in corporate feed network for patch antenna
I recommend eliminating the array altogether and instead put a single patch antenna inside the rocket body facing upward.
The frequencies of GPS signals will freely penetrate a non-metalic body, ...
- 18.6k
2
votes
Accepted
Generally, what happens when you power a GPS antenna or other RF amplifier with a low voltage?
It's hard to say whether your active antenna would work properly if provided with 3.3 VDC instead of 5 VDC. I doubt that any damage would be done, but I'm not the engineer that designed the antenna. ...
- 9,320
2
votes
How do I connect a GPS receiver to a radio for APRS?
Forget Baofeng.
Buy an old Kenwood THD7 for little more. I have one for 18 years and is rock solid still. It has APRS built-in and many other useful things. You can ...
- 59
2
votes
Accepted
Why do watches with GPS receivers have an "airplane mode"?
Some years ago when electronics on planes were still a big deal, I remember GPS receivers, portable CD players and radio receivers being singled out as Not Allowed.
This could be because radio ...
- 12.2k
2
votes
Accepted
Will two GPSDO units be precisely in phase with each other?
The PPS outputs should be in phase, subject to:
the inherent accuracy of the GPS, depending a but on signal quality, antenna location and ionosphere, also affected by the imperfect a priori knowledge ...
- 12.2k
2
votes
Is it possible to transmit telemetry data (GPS) via QRP?
If you are just transmitting GPS coordinates and at a slow rate and need a bandwidth of about 50kbps or less then have a look at LoRa technology.
It is low power, low data rate and spread spectrum but ...
- 173
2
votes
Is there a way to make `gnss-sdr` work with USRP B210 showing the PVT solution?
I know that GPSDO included with my USRP only works with GPS ANT connection so, how can i specify to gnss-sdr to use GPS ANT connection?
You don't. the GPS ANT connection goes to to the GPSDO only, ...
- 13.2k
2
votes
Accepted
Does GPS port of USRP B210 only used for GPSDO?
Does GPS port of USRP B210 only used for GPSDO?
Yes. You can actually follow the RF trace on the board if you have it in front of you. Also, Ettus has their schematics online and you can see the ...
- 17.4k
2
votes
What frequencies can a GNSS (Global Navigation Satellite System) antenna pick up?
It of course is very important for a GNSS antenna to reject out-of-band radiation (because the signal you want to detect is very weak, you will be utterly deafened if signals from adjacent bands are ...
- 17.4k
1
vote
What frequencies can a GNSS (Global Navigation Satellite System) antenna pick up?
Your question seems to display a fundamental misapprehension of a core aspect of antenna theory: resonance.
Antennas operate most efficiently at their designed frequency of resonance, which is largely ...
- 4,658
1
vote
How Duty cycle affects transmission rate in RF module?
Under the heading of "Software features include," the landing page for the RFD868ux says, "Automatic duty cycle throttling based on radio temperature to avoid overheating". This means that transmit ...
- 7,912
1
vote
Why do watches with GPS receivers have an "airplane mode"?
If the watch has a GPS, it may also have bluetooth or wifi, and typically the function of the airplane mode is to turn these transmitters off.
- 6,960
1
vote
Accepted
Required receiver for HX-1 (144.390 MHz) & NEO-6M GPS Module?
I understand that the HX-1 Radio Transmitter is an APRS, but how can I receive transmissions from this system? Could I track this with a RTL-SDR dongle?
Yes, an RTL-SDR dongle and Direwolf is one ...
- 13.2k
1
vote
Total cancellation in corporate feed network for patch antenna
On 1) let me take you through a though experiment I created, struggling with the same problem with a ring of antennas fed to make an Omni. You can back it up by calculation later.
Antennas are ...
- 12.2k
Only top scored, non community-wiki answers of a minimum length are eligible