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Results tagged with wireless-communication
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user 624
3
votes
How are three satellites sufficient to find a unique point in GPS? What happens in case of a...
how are three satellites sufficient to find a unique point in gps?
They are not. It takes four satellites minimum.
GPS needs to solve for the point in four dimensions, X, Y, Z and time. Four unkno …
- 11.5k
2
votes
TSOP IR receiver
You asked too many questions in one, so I'll just briefly make a few key points.
Think of the problem these devices have. The dynamic range of light levels they have to work with is enormous, and th …
- 11.5k
0
votes
Accepted
How do NFC/RFID devices transmit data?
The transmitter to receiver coupling is similar to how a transformer works. for a ideal transformer, whatever impedance is connected to the secondary appears as the impedance of the primary divided b …
- 11.5k
0
votes
Why GPS receivers are more sensitive than GSM or WiFi receivers?
Signal bandwidth, for one.
The data that a GPS receiver gets from the satellites is far less than a streaming phone conversation over the same time. This allows the RF bandwidth to be used to get hi …
- 11.5k
3
votes
Accepted
Why only the spectrum range of radio waves can be reflected from atmospheric layers while hi...
Different materials reflect, absorb, and scatter different wavelengths of light. The ionized layer at the edge of earth's atmosphere happens to reflect a certain range of wavelength while transmittin …
- 11.5k