The GPS signal transponder technology uses the existing GPS signals to improve the positioning ability. The use of these new technologies can still provide reliable location results when the receiver works in the bad GPS signal area.

The satellite navigation signal transponder is widely used in the test system. It is convenient for customers to place multiple satellite receiving devices in the indoor test. At the same time, it supports GPS, GLONASS, Beidou and Galileo four global satellite navigation system signal forwarding, and solves the problem of indoor satellite signal failure.

The satellite navigation signal transponder is mainly composed of CNSS outdoor receiving antenna, low loss cable (usually coaxial cable), GNSS satellite signal transponder, indoor GNSS transmitting antenna four main parts of the complete system, its working principle is the outdoor satellite navigation signal, through the satellite signal transponder, after filtering, amplification and other processing, the real-time satellite wireless signal forwarding. To indoor space, provide satellite signals to indoor receiving devices that need to receive GNSS signals. The schematic diagram is as follows:

The SYN2308 GNSS satellite signal transponder is mainly composed of three parts: the satellite receiving antenna, the low loss radio frequency cable and the transponder main engine.

The radio frequency signal is amplified and filtered by the receiving antenna, then sent to the transponder host to complete the signal extension and demodulation, and realize the positioning function check of the navigation signal. At the same time, the code stream and message information are re modulated and upconverted to get the radio frequency signal, and sent to the transmitting antenna through the RF port of the transponder main engine.

Main functions and technical indicators

The GPS transponder has two main functions, one is satellite signal enhancement and two is self location check. The transponder receives the navigation signal of the BD/GPS, demodulates the stream and message information, and re modulates and upconversion to get the RF signal, and completes the signal forwarding function, and the output signal level can be adjusted according to the actual demand.

When the satellite navigation signal reincarnator is used, the outdoor satellite antenna needs to be placed outside, and it is recommended to be installed in the open space of the roof, which will help to receive effective satellite signals in any environment and prevent the interference of the bad weather from satellite signals. At the same time, in order to prevent the interference of thunderstorm weather, it is possible to add BNC type antenna feeder surge protector between the satellite antenna and the satellite navigation signal regenerator. It is a necessary surge protection device for outdoor wireless base station construction. It can ensure the reliable operation of the whole system and avoid it from lightning, induced overvoltage, electrostatic discharge and other surge voltages.

The satellite navigation signal regenerator works indoors and provides a complete test environment for the indoor environment through effective satellite wireless transmission. At present, there are many devices on the satellite navigation signal transponder, mainly in the chassis type, which need to be equipped with special cabinets or environment. In industrial or civil testing systems, they only need to meet the signal coverage requirements, convenient for system installation and easy to carry.

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