the vast majorityGPS antennaIt is a right-handed polarized ceramic medium, consisting of ceramic antenna, low-noise signal module, cable, and connector.
　　
Ceramic antennas, also known as passive antennas or dielectric antennas PATCH， It is the core technology of GPS antenna. The signal reception capability of a GPS antenna largely depends on the composition and ingredients of its ceramic parts.
　　
The low-noise signal module, also known as LNA, is the part that amplifies and filters signals. The selection of its components is also important, otherwise it will increase the reflection loss of GPS signals and cause excessive noise.
　　
The selection of cables should also be based on reducing reflection to ensure impedance matching.
　　
　　GPS antenna selection
　　
1. GPS cannot provide 100% positioning, let alone believe the nonsense of indoor positioning. GPS is not like mobile broadcasting, where signals can be received anywhere. Many things can affect GPS reception, including the distribution of sky stars, buildings, elevated bridges, radio waves, leaves, insulation paper, etc. There are too many things that can be affected. Generally speaking, the area of the sky that can be seen from the GPS position is the area where the GPS can receive signals.
　　
2. Don't use it once or twice, or for a day or two, to determine the quality of GPS - because the satellite status in the sky is different every day, perhaps in the same place, the morning signal is full, but at night it cannot be located. It is possible that the positioning situation is not good for several days in a row.
　　
3. To compare the quality of GPS, it is necessary to compare it at the same time and in the same location - many people who buy a new GPS will say things like 'the one I used before was better', but this statement is incorrect because the results are much different due to different usage times and locations. It is necessary to use it for a long time or at the same time and place to feel the differences between the two types of GPS.
　　
4. The GPS signal intensity meter is no longer sufficient as a reference for purchasing GPS - when buying GPS, people only look at the signal meter in the electronic map. In the past, it may have been quite accurate, but now GPS has fake signals or simulated signals to make the signal meter look good. The signal meter is indeed beautiful, but it may not be accurately located or even displayed correctly.
　　
5. There is no GPS for indoor positioning - basically, if there is no signal indoors, there is no signal. True indoor positioning starts from Coldstart indoors, but if it can still be located, it is true indoor positioning. However, indoor positioning is basically meaningless because I cannot navigate at home.
　　
6. When purchasing GPS, there is no need to choose the manufacturer as the purchasing option, but internal chips can be selected - basically, there are many GPS manufacturers, and choosing a manufacturer only considers after-sales service. It is not necessarily the case for large manufacturers to receive messages. Generally speaking, GPS with the same chip will not have significant differences in effect when made by different manufacturers. Therefore, when choosing GPS, you can choose GPS receiving chips instead of choosing a manufacturer.
　　
7. Should Bluetooth be used, CFgps, Or gpsmose? -Generally speaking, this is a matter of personal opinion. When using Bluetooth or CF, one must worry about the problem of GPS or PDA running out of power at any time, and the cost is relatively high. However, navigation can be done anytime and anywhere, and using GPS mouse is economical and good for receiving messages. There is no need to worry about power issues, but there are problems with wired communication.
　　
8. Inaccurate positioning may not necessarily be due to GPS errors - basically, a positioning error of less than 20 meters is considered a good GPS. In addition, the GPS position may not be very accurate on the road due to various reasons, such as poor reception, errors, map data problems, or wide roads. Therefore, it seems that the GPS is stably offset from the road surface. After using it for a long time, you will know whether it is a problem with the GPS or the map.
　　
9. When purchasing GPS, the specification sheet is for reference only. The GPS specifications include how many seconds to complete positioning, how many meters of error, sensitivity, and other information. These are all well written and need to be truly used to know. To be honest, comparing the specification sheet is a waste of time.
　　
10. Using GPS, there is no need to charge communication fees - although everyone knows about it, some people still think that there is an additional monthly rental fee.
　　
11. When the store says that xxxGPS is not good, don't believe it too much - it may be that the store is not selling it anymore, or there is a lot of inventory of another product. We recommend you to buy another GPS.
　　
12. If GPS can be placed inside the car, then it should be placed inside the car - except for external antennas such as gpsmose. If GPS can be placed inside the car, then it should be placed inside the car because although it is waterproof, it will inevitably have hanging points when placed outside for a long time. In addition, when getting in and out of the car, it needs to be stored back and forth, and it will be dried away when placed outside. It is recommended to carefully choose grid heat paper or cut a hole in the grid heat paper and stick other things on it to make it look less ugly.
　　
13. If the GPS is newly purchased and used for the first time, or is already in cold start mode, please go to a designated location in an open area for external positioning. This way, the positioning speed is faster and there will be fewer strange phenomena. If you drive directly on the road in cold start mode, even if the signal is strong, you may not be able to locate your destination!! This is very important. After positioning, put it in the car and see if the reception inside the car is poor. In addition, the longer the GPS is used for a single time, the longer it can save satellite data. If it is not used for a long time, such as one to two weeks, the GPS may return to a cold start state. The above is for those who are new to satellite navigation. Hopefully, with these psychological preparations, you will not feel that satellite navigation is not easy to use. Basically, as long as you can reach your destination, satellite navigation is a very useful thing for you. As for whether it is time-saving or the distance is short, don't demand too much. Basically, when you arrive in a strange place, as long as you can smoothly get there, it is good enough. Perhaps there will be some ridiculous plans and more roads to walk along the way, but over time, you will understand the characteristics of the current satellite navigation, and you will not feel so uncomfortable when using it. Of course, map manufacturers still need to work hard, but we hope that everyone can give manufacturers appropriate encouragement. Purchasing genuine products is support