The flat antenna of GPS vehicle positioning terminal is a type of vehicle terminal antenna that is durable, easy to manufacture, and widely used. Flat panel antennas can be circular, square, or rectangular, similar to a printed circuit board coated with copper. Due to the fact that the antenna is composed of one or more metal sheets, the most commonly used shape for GPS vehicle positioning terminal antennas is a block structure.

　　The size of the GPS vehicle positioning terminal antenna is very small, so it is very suitable for aviation applications and personal handheld applications. Another important feature of the GPS vehicle positioning terminal antenna is its gain pattern, which is directional. By utilizing the directionality of the GPS vehicle positioning terminal antenna, its ability to resist multipath effects and interference can be improved.

　　In precise positioning, the stability of the phase center of the GPS vehicle positioning terminal antenna is an important indicator. However, in ordinary navigation applications, people hope to use omnidirectional GPS vehicle positioning terminal antennas, which can receive visible satellite signals in the sky within a field of view of at least five degrees above the ground level from the GPS vehicle positioning terminal antenna. However, when the satellite is directly above the vehicle positioning terminal skyline, the signal gain of the flat antenna is the largest. This disadvantage also highlights that the reception range of the flat antenna is above the flat panel, and the flat panel needs to face the sky, which is a hassle for both handheld and vehicle mounted devices. Although the satellite signal above the head is better and easier to lock, in reality, the satellite above the head is the least useful. Without a low angle satellite, the error will be relatively large and the accuracy will be poor.

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