Author: Longya source: a mountain of Longya (ID: longyadeyizuoshan)
Pure chicken ribs, IQ tax, even for Canada and the United States, which open their services, are not very useful. Most of them have comforting effects. If you really rely on this to save your life, I think your life is more at stake. I don’t know if anyone will count the number of people who have successfully saved themselves with apple phones / the number of people who have tried to save themselves with apple phones in the future. I estimate that this ratio will be quite low.
Please note the two arrows:
The first rule determines that it can’t work in an emergency. It depends on the scene. It can only be used when there is an open space and time to find star to star. What do you do in this case? You have time to find stars. Will it be time to compile a few words of text messages?
The degree of intellectual disability of this design is similar to taking off your pants and farting.
The second determines that it can’t be used in China. It doesn’t support Beidou. You want satellite functions. Which one do you use? Let’s say in advance that it is illegal to connect foreign satellites without permission. If you don’t accept it, you can argue with the NPC first. If you don’t, I don’t care about the law. Moreover, the United States also rejects the Beidou. This is equal to both sides. Don’t discriminate against us Chinese, OK?
However, this function must cost money, not for free from apple. You must absolutely spend money on this function that you are doomed to use. Even if the Chinese version of his 14th edition does not contain this function, you actually have to pay for it. Does he not share the R & D cost of this function module in North America with you?
I’m not buying it
Of course, fruit fans love to pay IQ tax, which is beyond their control. Maybe people just like apple and have to pay for functions they don’t use, right.
From the perspective of communication principle, the function of Apple’s satellite is simply outrageous, and it deeply reflects the limitations of American GPS and the feeling of powerlessness relative to Beidou.
First, let’s talk about two nouns: looking for stars and looking for stars.
Looking for a satellite means that the terminal equipment in your hand recognizes the received satellite broadcast signal. This broadcast signal is around you 24 hours a day, 360 ° without dead angle. When you turn on your device and activate this functional module, it will recognize the signal and perform a series of calculations, and finally provide some functions.
For example, at this moment, my equipment has received 11 GPS satellite signals from the United States, 6 “GLONASS” signals from Russia and 11 “Beidou” signals from China. It means that my position can receive positioning signals from 11 satellites in the GPS system, including 6 GLONASS and 11 Beidou.
Communication satellites also need to “look for satellites”. In this process, what you look for is the satellite’s broadcast signal, which can only be sent to you by the satellite, but you can’t send it to the satellite.
Pointing at the satellite refers to pointing at the satellite in a specific direction with the antenna of the terminal equipment in your hand.
Those who have played with the satellite TV receiving antenna have done this work, so that the line between the center point of the paraboloid of the satellite antenna and the focus points to the direction of the satellite in the sky.
The function of searching for stars is very simple. In theory, everyone’s mobile phone has this function, including the mobile phone in your hand. As long as you can locate it and send “My Location” on wechat, you can find stars.
Right star, that’s another matter.
At present, there are only two methods for star alignment: mechanical star alignment and phased array star alignment. Mechanical alignment is to point the antenna direction to the satellite by hand or motor; Phased array alignment is slightly more complicated.
Apple 14 uses phased array to target stars. Of course, it’s not very good.
In a simple way, phased array is a bunch of multiple antennas, and the time (phase) of electromagnetic wave emitted by each antenna is different, so that the electromagnetic wave will point in a certain direction when it goes out. By adjusting the emission time (phase) of each antenna, the direction can be flexibly adjusted.
This is a phased array radar antenna used by a fighter. The principle is the same. Each “dot” above is called a T / R unit, and the transmitting / receiving unit is an antenna. This antenna array is called phased array.
Apple 14 is based on this principle.
There must be an antenna array in it. The phased array principle is used to realize such a scene:
The user roughly aligns the antenna array with the satellite;
Phased array antenna array automatically realizes accurate star alignment.
A civilian mobile phone can’t install a set of “tetrahedral array” for you. Apple is willing to spend money, and you can’t afford to buy it, let alone have such a large battery. I don’t know the transmitting direction of this antenna array, but it is mostly on the back or top of the mobile phone. In short, if you want to use this function, you must hold the mobile phone in a specific direction.
Then Apple’s automatic satellite alignment algorithm starts, determines the direction of the satellite according to the broadcast signals received by each antenna, and then adjusts the transmission phase so that the main lobe of the electromagnetic wave faces that direction to achieve communication with the satellite.
What’s so stupid about this function? Its application scenarios are too few.
You must stand in an open place, ensure that there is no obstruction between the mobile phone and the satellite, roughly face the mobile phone toward the satellite, and wait for its satellite alignment algorithm to align the satellite.
Therefore, it is impossible to realize your hypothetical scene of “being kidnapped and tied up in the house without cellular network signal and then activating satellite communication function to send messages to rescue”
The satellite function of Apple 14 is only limited to when there is no cellular network signal and you can see the constellation it supports in the open field. You also need to roughly know the direction of the satellite, and then the mobile phone antenna array faces that direction. Wait a few minutes until the mobile phone establishes communication with the satellite, and then send a “pre prepared message”.
This function may only be needed by Americans who are particularly keen on outdoor death, right?
The principle is here. Whether you understand it or not is your own business. I only discipline, not the church.
The Vatican governs the church.
In short, this function is too limited, and it is bound to have little improvement under the current restrictions of satellite communication technology, and there are very few use scenarios.
In that scene, there are more reliable and effective means, such as professional satellite phones.
But you still have to pay for this feature you don’t need.
In this wave of speculation about the so-called “satellite communication function”, all major mobile phone manufacturers are collecting IQ tax, no matter which one.