At present, the car electronics market is becoming more and more popular, and 4g car gps tracker is becoming more and more popular. In order to seize the market, many GPS merchants continue to publicize how powerful their products are and how accurate their positioning is. Many even say that their devices are in underground parking lots or indoors, etc. Closed places with poor signal can be located. So is this the case? Let's listen to my analysis.
Can the car be positioned in places with poor signals such as parking lots or indoors? The GPS terminal consists of two important modules: the positioning module and the communication module. All location information is transmitted through communication signals. For example, a person enters with a mobile phone On the third underground floor, mobile phones cannot be connected. We know that the common indoor positioning technologies include infrared technology, radio frequency identification technology, ultra-wideband technology, wireless local area network, Bluetooth technology, etc. There are four main positioning methods for car positioning equipment: GPS positioning, base station positioning, WiFi positioning, and Beidou positioning. There are also a small number of manufacturers will use RFID positioning technology, IP positioning, Bluetooth positioning and so on. Are these positioning methods used in cars suitable for indoor positioning? Let's analyze them one by one.
GPS positioning: GPS positioning is the most used car positioning device. Almost every locator will have this function. However, GPS non-professional positioning devices in indoor, underground parking lots, under high bridges, and dense floors are also well known in the industry. , When using the GPS locator, the use environment is in an open space outdoors, and the place where the GPS satellite signal is received is better, and the indoor expectation should not be too high.
Base station positioning: When the car enters an area without GPS signal, there is usually another positioning method to assist positioning - base station positioning, which is one of the reasons why many products are boasted that they can be positioned indoors. Base station positioning can indeed be used indoors, but do you know that? The error of base station positioning is far greater than the error of GPS positioning, usually between tens to hundreds of meters, sometimes larger, even more than 1000 meters. Just imagine, it is still difficult to find a car within a range of hundreds of meters, especially underground. parking lot. In addition, we know that the accuracy of base station positioning depends on the base station, just like our mobile phones, but if it exceeds the service range, or the number of base stations where the vehicle is located is insufficient, LBS positioning cannot be performed. Most of the mobile phones have very few signals, so it is conceivable that the base station positioning is not very good.
WIFI positioning: I will not talk about the principle of WiFi positioning. In short, there must be a WiFi signal. It is still very common to have WIFI signals indoors, but it is limited to towns and cities. In remote places, there is still little WiFi, and in those large parking lots, the WiFi signal is also low or very poor, which is difficult to use for positioning. Most importantly, few manufacturers use WiFi positioning.
Beidou positioning: The principle of Beidou positioning is the same as that of GPS, but the accuracy is lower. GPS cannot be used indoors, and Beidou is even more useless.
RFID positioning: This is one of the common indoor positioning technologies. Unfortunately, most of the car locators are used to remotely open and close doors, windows and anti-theft, and are not really used for positioning.
Bluetooth positioning: Bluetooth positioning is mainly used for small-scale positioning, such as: single-storey halls or warehouses. For a mobile terminal device with integrated Bluetooth function, as long as the Bluetooth function of the device is turned on, the Bluetooth indoor positioning system can determine its location. It can be seen that it is not suitable for car positioning, let alone indoor positioning.
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