There are many manufacturers of GPS positioning devices, but not all of them are "a man with professional training". Therefore, we must know how to distinguish between true and false when purchasing GPS positioning device. There are several common senses to know.
1. Civil GPS positioning device with a maximum accuracy of less than 10 meters
The GPS positioning devices we are using now belong to the civilian-grade GPS. (We don't discuss it at the military level for the time being). In the case of good signal (under ideal conditions such as open ground and sunny weather), the positioning accuracy is generally around 10 meters. If it is LBS (base station) positioning, the positioning accuracy is generally between 100 meters and 1000 meters.
GPS positioning accuracy is achieved by a certain algorithm. For the environment at that time, if there are high-rise buildings, interference signal sources, and cloudy weather, the positioning accuracy error will definitely be relatively large. The high precision mentioned in the market can only be achieved under ideal conditions. Even if it is the same machine, the same place, the positioning accuracy is different at different time periods is normal.
2. Not a battery can do long standby GPS positioning device
For a long standby GPS positioning device, the capacity and characteristics of the battery determine the length of the standby time.
We all know that the standby time is proportional to the battery capacity, the capacity is about the same, and the endurance is stronger. Therefore, the battery capacity can be roughly used as a judgment method.
Then not all large-capacity batteries are suitable for such positioning. There are many types of batteries, and there will be self-discharge during normal use, which means that the battery will consume its own power. If the self-discharge of the battery itself is very high, even the larger capacity will not support the concept of long standby.
A very obvious battery that cannot be used for long standby is the polymer battery pack battery. Under normal circumstances, the self-discharge of this battery is very high, you can imagine your own mobile phone battery. Look at how long it will take if you turn it on after a month.
3. The smaller the GPS positioning device, the higher the technical content, but not the smaller the better.
The smaller the volume of the GPS positioning device, the higher the technical content without reducing the component configuration. Because for the R&D personnel, it is necessary to lay out so many lines and components in the limited area, and test your comprehensive control ability and overall planning ability. But not as small as possible.
The most important part of the GPS positioning device is the GPS module and the GSM antenna, and the space occupied by the two is relatively large. If the space is neglected, the impact on the signal is quite large. There is no fixed GSM antenna, even a small wire to replace, such a signal is not only poor, but also extremely unstable.
4. Small size wireless GPS positioning device standby 5 years is difficult
As we said above, the wireless GPS positioning device relies heavily on the battery, especially the battery capacity. If the volume is too small, the battery capacity must not be too large. In the case that the battery capacity is not enough, the probability that the GPS positioning device can stand by for 5 years is small. To stand by for 5 years, the battery capacity must be at least 10,000 mA.