First, mobile phone positioning It must know the mobile phone number or your mobile phone device number (knowing that you use a mobile phone).
Second, the mobile phone must be turned on.
Third, the stalker only knows the unique information of your mobile phone number and knows nothing about you, while you are doing something important or being displaced. You can find the number of the mobile phone device you are using through the mobile phone number.
As long as you turn on your mobile phone (even if you change the number, it's useless), at least they can know that you are in an area of several hundred square meters to one or two square kilometers (urban area) or a few to ten square kilometers in the countryside.
Because people don't stay there and often move in a relatively stable range, it is easy to sum up a fixed community, which is the place where you stay, or the place where you stay the longest, or the place where you often go, or the place where you have to pass, and it is generally regular and the time range can be counted. They investigate and track leaders according to this law.
Five, now China Mobile and China Unicom (C network adopts the mixed positioning technology of wireless network-assisted GPS positioning and triangulation positioning). Covering almost all areas of China.
Mobile phones keep communication through this facility called "base station". Several (3- 12) flat antennas can often be seen on some buildings or iron towers beside the expressway. Just call it a base station. A base station is generally divided into three directions, each direction is called a cell, and a base station consists of three cells, one, two and three * * *, each direction. Base stations with more than three cells have smaller coverage and are easier to find because of their location.
All base station cells can be uniquely numbered and identified. After the mobile phone is turned on, it must first be registered by the base station, and parameters such as location area, cell number and received mobile phone signal strength will be sent to the local switching center. At the same time, adjacent base stations (usually two) will also be read by the switching center for their received parameters such as cell phone signal strength, and the positioning will be concentrated here.
Each base station can estimate the approximate distance between the mobile phone and the base station according to the signal strength sent by the receiving mobile phone to the base station. The cooperation of three base stations can generally make the positioning accuracy very high, and the accuracy may be within tens of meters. With the movement of people, when they get out of the coverage of this base station (for example, base station A) and enter the coverage of another base station (for example, base station B), base station B also sends the cell number where the mobile phone is located to the switching center, thus moving on.
And according to the length of time after each community, you can judge whether to take the bus or walk. It stops at the destination, such as the coverage of the second cell of F base station. Then if this community is in a big city or downtown, its scope is several hundred square meters, but at most it is one square kilometer. If other mobile phones are located and tracked through other channels and stay in this community, then these processing results can be sent to computers or special equipment of those departments.
Generally, there is only one switching center in a telephone area code city, and there are hundreds to thousands of base stations in a city, which is equivalent to passing this switching center, that is, mobile phone roaming, and entering the switching center of another city (region), so the monitored mobile phone is also monitored when it leaves the local area.
In order to further ensure the success rate of positioning, communication operators can still use CELL-ID for positioning even if the positioning fails. CELL-ID is the most basic self-positioning technology in cellular networks, and it is also the one with the worst positioning accuracy. It can only judge the target person in a certain sector of a base station, and take the central position of this sector as the target person's position, with an average positioning accuracy of about 50 meters.
It is worth noting that if the mobile phone is tracked, changing the mobile phone number card can't get rid of the tracking. The mobile phone itself has a device number that uniquely identifies the mobile phone. Once turned on, this serial number will be recorded by the mobile network. If the number card used in this mobile phone is monitored, the device number of this mobile phone will also be monitored, even if it is replaced with a new card.
Extended data function settings
Screen and camera
IPhone includes the media playback function of iPod, the modified MacOSX operating system (iOS, starting from version 4.0, its real name is iPhoneOS) for mobile devices, and an 8-megapixel camera.
(First and second generation 2 million, 3GS 320 million, support autofocus. The fourth generation has been upgraded to back-illuminated 5 million, while the 4S released by 20 1 1 has been upgraded to 8 million, with a large aperture of 2.4f In addition, the device has a built-in gravity sensor, and the iPhone4 has a three-axis gyroscope (three-axis direction gravity sensor), which can be adjusted horizontally or vertically according to the user.
And the built-in light sensor supports adjusting the screen brightness according to the current light intensity. There is also a built-in distance sensor to prevent the operation caused by the ear touching the screen by mistake when answering the phone. IPhone4S and 5 released in September, 20 12 added a brand-new camera mode-panoramic mode, which can be used to take panoramic photos, and the panoramic photos can reach 28 million pixels.
Mobile phone, widescreen iPod, Internet equipment-iPhone integrates three functions. With the multi-touch technology of iPhone, you can easily make calls between applications with a single finger. You can also copy and paste words and pictures directly from the website. At the same time, it is also the world's first mass-produced commercial capacitive screen smartphone.
Patent application
Anti-fall patent
IPhone anti-fall patent
On the morning of March 22nd, 20 13, the United States Patent and Trademark Office (PTO) disclosed a patent application filed by Apple on March 2nd, 20 13, which aims to prevent electronic devices such as iPhone from being broken after falling.
The name of this patent is "protection mechanism of electronic equipment", and several methods to prevent electronic equipment such as iPhone from being broken after falling are introduced.
One way is that the sensor that comes with the device will detect the falling height and speed of the mobile phone, and then adjust the orientation of the fuselage. In this way, products such as mobile phones can adjust their orientation in the process of falling, so that the falling-resistant position will land first, such as the corner or back, rather than the fragile position, such as the screen. In order to achieve this function, the equipment needs to be equipped with a "protection mechanism", and it may be necessary to change the direction of the fuselage with a small can of compressed gas.
Another way is to slow down the falling speed of the equipment during the falling process, just like equipped with a parachute. In order to realize this function, the protection mechanism needs to trigger a device similar to a propeller, thus reducing the falling speed of the equipment.
Although Apple only mentioned the iPhone in the patent application, industry insiders said that these technologies can also be applied to other products such as smart phones, tablets, portable music players and digital cameras.
keynote
20 15 1, the US Trademark and Patent Office announced a patent submitted by Apple. According to the submitted draft patent, the Home button of iPhone or iPad may pop up the joystick with one button in the future.
The name of the new patent is called "Multifunctional Input Device". According to the patent introduction, the newly designed Home button is no different from the existing Home button in appearance and function. But if you put some pressure on this Home button, a joystick only the size of a thumb will pop up. The recovery method is also very simple. Players can press the rocker back to its original position after using it.
Splash-proof function
On March 20 15, the U.S. patent and trademark office published an apple patent to add waterproof function to the internal components of "computing equipment". The patent does not specify any specific device, but the iPhone can be regarded as the most reasonable candidate.
IPhone7 series supports waterproof and dustproof.
IP67 splash-proof and dust-proof functions are supported in iPhone7 and iPhone7Plus released in September of 20 16.
Reference source: Baidu Encyclopedia: Apple mobile phone