What is going to be dismantled this time is the car tracking device used by the FBI? If you are going to be weird, what have you done with such confidential things? In fact, this is a woman named Karen Thaomas who inadvertently found it under her car.
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The tracking device includes a GPS unit for tracking vehicle positioning, an RF transmitter that is primarily used to send its location to the FBI, and a set of batteries for device power drive support. We don't just ignore the visual enjoyment to understand this? ! Now unveil the mystery of the FBI car tracking instrument!
In the above figure, the clockwise direction is the battery pack, GPS antenna, transmitting/receiving unit and magnetic mounting bracket.
What exactly is power supply for this amazing device? Let's open the bottom of this battery pack and find the answer.
The power of this equipment was originally provided by four solar lithium batteries (Li-SOCl2).
Each battery has a capacity of up to 13,000 mAh! About twice the ipad 2 battery!
These solar cells are suitable for low voltage, long life receiver/transmitter powered environments
Let's start with two separate transmit/receive modules that are connected by wires.
The shorter, smaller, unconnected antenna in the picture above is the transponder that transmits the local signal to the FBI, and the FBI can immediately know where you are. The larger antenna is used to receive GPS signals from above the Earth.
After removing the screw, we can see the internal structure of the GPS antenna.
In order to be detachable at any time, the GPS antenna is glued tightly together.
Take a look at the antenna board, which shows that it is made by SIgem. The company and Tyco have jointly developed GPS components in early 2000.
Now let's go back to the receiver/transmitter module
Some external screws still separate us from its interior
It can be seen from the back cover that it is very easy to connect with the power module.
In order to go directly into the "brains" of the module, we will now focus on the back cover. The FBI does not want others to arbitrarily manipulate the internal settings of their tracking devices, so that we have to pull out the drills to get the screws. Get a chicken feather.
After removing the screw, you can see the exposed transceiver board immediately.
It can be seen that the two boards can be separated, and it is assumed that the convenience of the detection circuit should be considered.
The blue wire in the middle connects the GPS cable to one end of the GPS receiver board.
When we disassemble the GPS board module, we can see the details of the internal components more clearly.
The module has a GPS signal processing device, μ-blox GPS-MS1, which can be regarded as the originator of modern electronics.
There is a backup battery on the back of the module to drive the real-time clock and maintain the SRAM of the GPS receiver to work properly, so that it can be connected to the satellite for very fast communication. This action is called "hot start".
Larger module with built-in tracker antenna and RF
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