We know that whether it is a mobile phone or a car GPS locator, the signal antenna is a very important electronic component. With the development of technology, signal antennas have been extremely rare and have been eliminated, and today's antennas are hidden inside the machine.
The early GPS locator also had the existence of an antenna, but for the current technology, it is not difficult to hide him inside the machine. We call it the built-in antenna. I have seen some friends here will ask that which is better for GPS locator with built-in antenna or an external antenna?
The role of the GPS signal antenna is to convert the radio signal transmitted by the satellite, the electromagnetic wave energy, into the current that the receiver electronics can ingest. Therefore, the size and shape of the GPS signal antenna are very important. They determine that the GPS antenna can acquire the weak GPS. The ability of the signal and the degree of stability of satellite signal reception.
The difference between the built-in antenna of the car GPS locator and the external antenna
First, the built-in GPS antenna is the antenna inside the device, the device and the antenna are integrated; the GPS antenna is externally located with an external GPS signal antenna, the device and the antenna are separated, and the device is connected by the host, the signal line and the power line. composition.
Second, GPS antenna built-in type: Generally speaking, the built-in GPS built-in antenna type is smaller than the external type, easy to use, and does not need to be connected to the power supply, but this also makes its operating radius smaller than that of the external antenna. Only 5-10km.
The working range of the car GPS external antenna is much more than the built-in antenna, and the working radius can reach more than ten kilometers, but it also has disadvantages, and the power consumption is much more than the built-in type GPS.
Therefore, it is generally only a wired car GPS locator that will have an external antenna. The GPS of the built-in antenna is generally a wireless car GPS locator. (Of course this is not absolute! Wired GPS locator is not necessarily an external antenna, but wireless GPS must be a built-in antenna! Because the wireless GPS locator is built-in battery, this battery can not block the antenna consumption.)
Advantages and disadvantages of built-in antenna and external antenna for car GPS locator
GPS antenna built-in type
Excellent: small appearance, free installation, safe and concealed
Lack: It will affect the reception of the signal, and the signal is worse than the external type.
Interestingly, the receiving environment of the car GPS locator antenna is more complicated. The environment such as dust, vibration, heavy rain and high temperature has a great impact on the car GPS, especially the metal casing of the vehicle and the explosion-proof film of the glass, as well as the car audio. The built-in GPS antenna receives signals that cause interference or even block. According to the experimental statistics, if the front windshield of the vehicle is attached with a metal film, the signal receiving intensity of the GPS positioner of the car will decrease by 25%-50%. Therefore, this type of positioner is generally used in private cars, rental cars, mortgage cars, etc., because the antenna is built-in, free of installation characteristics, there is no need to worry about the antenna being cut, the equipment is destroyed, and the GPS positioner can be conveniently placed in the vehicle. Concealed places, thieves, illegal elements, etc. are difficult to find, although the positioning accuracy is not externally high and stable, but it is also enough for individual car owners.
GPS antenna external type
Excellent: strong signal and stable
Lack: need to be installed, easy to be found, will be affected by trimming
Because this type of device is external to the signal line, it can transmit higher frequency signals, the emission range is larger, and it is close to the outer range of the sky, so the signal and stability will be much better and the accuracy will be better. However, the size and shape of the receiving antennas of such devices are important for the reception of signals, which determine the ability of the antenna to acquire weak GPS signals and the stability of satellite signal reception. The external signal of GPS antenna is stable, and the quasi-positioning feature makes it widely used in public operating vehicles, freight vehicles, etc. It is of great significance to the dispatch control of enterprises and transportation management departments.
As mentioned above, the external antenna type signal is relatively better, and the built-in antenna type is convenient and simple, and both have advantages and disadvantages. The positioning accuracy of the car GPS positioner is not only determined by the built-in externality of the antenna. The placement mode, assembly position and internal workmanship of the device will affect the effect of the GPS receiver receiving satellite signals. Owners and friends should consider the type of car, the required functions and the quality of the equipment, not just the type of antenna.
