Anti-interference satellite receiving equipment antenna switching apparatus under shielding condition

Abstract

The invention provides an anti-interference satellite receiving equipment antenna switching apparatus under a shielding condition. The apparatus comprises a radio frequency joint, a radio frequency cable and a signal synthesizer. One end of the radio frequency joint is connected to an external connection antenna and the other end is connected to the signal synthesizer through the radio frequency cable. Satellite signals received by the external connection antenna in an unshielding environment are input into an external connection signal terminal of the signal synthesizer. Satellite signals received by an array antenna of the anti-interference satellite receiving equipment are connected to a GPS terminal and a BDS terminal of the signal synthesizer respectively. Input signals are combined through a power divider and are selected by a microwave switch in the signal synthesizer and then are output to a receiver module. Under the shielding condition, the satellite signals received by the external connection antenna are used; and after shielding is eliminated, the satellite signals received by the array antenna are used. In the invention, signal switching between the external connection antenna and the array antenna of the equipment can be completed so that the anti-interference satellite receiving equipment can work normally under a shielding state and can rapidly position after the shielding disappears.

Description

technical field [0001] The invention relates to the field of satellite navigation anti-jamming receiving equipment, in particular to an antenna switching device for satellite receiving equipment in a blocked environment, which is applied to the environment when the anti-jamming satellite receiving equipment is blocked. Background technique [0002] The satellite navigation system is a radio communication navigation system that uses satellites as a communication platform. The system can provide all-weather, continuous, high-precision position, speed and precise time information, and has been widely used. However, due to the limited transmission power of the satellite and the distance from the ground, the signal power strength reaching the ground is about -130dBm, which is easily subject to unintentional or intentional interference from the outside world. The anti-interference antenna can effectively avoid the influence of interference signals on satellite navigation equipment....

AI Technical Summary

Problems solved by technology

The process is complex and error-prone

[0007] 2) There are certain risks in using ephemeris loading

The ephemeris data has a certain validity period. If the loaded ephemeris has expired, it may lead to inaccurate positioning results.

[0008] 3) When using the ephemeris loading method, in the case of occlusion, the anti-jamming satellite receiving equipment cannot receive satellites normally and cannot provide effective positioning information

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