GPS mast module and mobile radio installation
View Patent ↗An improved GPS mast module is characterized by the following features: the GPS mast module may be connected in a HF main transmission line ( 7, 107 ) between a base station (BS) and an antenna assembly (ANT), in particularly a mobile radio installation, and the satellite signals from an internal or connectable GPS antenna (GPS-ANT) can be supplied by a directional coupler ( 23 ) to the HF main path ( 7, 107 ).
1. Global Positioning System (GPS) mast module comprising:
at least one satellite antenna (GPS-ANT; GPS-ANT 1 , GPS-ANT 2 ),
at least two connections, namely a base-station-side connection and a mobile-communication-antenna-side connection,
a portion of a main high frequency (HF) path for transmitting HF transmission and/or receiving signals of a mobile communication system extends between the at least two connections,
the at least one satellite antenna (GPS-ANT; GPS-ANT 1 , GPS-ANT 2 ) is coupled to at least one portion of the main HF path via a satellite receiving line,
a low-noise satellite reception amplifier is provided in this satellite receiving line,
the low-noise satellite reception amplifier has on the output side at least one frequency selector for suppressing one or more mobile communication frequencies of an antenna (ANT) which is or can be connected to the mobile-communication-side connection,
the supply circuit for the main HF path is constructed in such a way that
a) a loose connection of the output of the frequency selector to the main HF path is provided by a hybrid coupler, and
b) the amplified satellite signal is supplied with a coupling attenuation of at least 10 dB by the hybrid coupler, the satellite reception amplifier having an attenuation at least 6 dB greater than the coupling attenuation of the hybrid coupler.
2. GPS mast module according to claim 1 , characterized in that the hybrid coupler has a coupling attenuation of at least 20 dB for the main HF path.
3. GPS mast module according to claim 1 , characterized in that the satellite reception amplifier comprises at the input thereof a frequency selector for preventing an overload of the satellite amplifier.
4. GPS mast module according to claim 1 , characterized in that an intermodulation suppression is provided, specifically
a) in the form of the hybrid coupler, whereby decoupling with a coupling attenuation of at least 10 dB can be provided, and/or
b) in the form of a frequency selector at the output of the satellite reception amplifier, and/or
c) in the form of a frequency selector, consisting of a ceramic material filter or comprising a ceramic material filter, at the output of the satellite reception amplifier.
5. GPS mast module according to claim 3 , characterized in that the frequency selector comprises or consists of a band-pass, a low-pass, a high-pass or a band-stop.
6. GPS mast module according to claim 1 , characterized in that the satellite signal received via the satellite antenna (GPS-ANT) can be supplied in a converted form to the corresponding portion of the main HF line.
7. GPS mast module according to claim 6 , characterized in that the satellite signal received via the satellite antenna (GPS-ANT) can be converted in a frequency range different from the receiving frequency range by a mixer and can be supplied to the corresponding portion of the main HF path.
8. GPS mast module according to claim 1 , characterized in that the GPS mast module comprises a bias tee or diplexer circuit, via which a direct-current coupling-out and/or coupling-out of low-frequency signals from the main HF path can be carried out.
9. GPS mast module according to claim 1 , characterized in that a further interface and an evaluation and/or control electronic circuit are further provided and are connected via a signal bus.
10. GPS mast module according to claim 1 , characterized in that an isolating capacitor is connected between a base-station-side and mobile-communication-antenna-side interface in the GPS mast module in the main HF line/main HF path, and in that
a) the coupling network is connected on the antenna-side portion of the main HF path for supplying the satellite signal in relation to the isolating capacitor and/or
b) the bias tee or diplexer circuit is connected to the base-station-side portion of the main HF line/main HF path based on the isolating capacitor.
11. GPS mast module according to claim 9 , characterized in that the evaluation and/or control electronic circuit is connected via a control line, which can be switched on, to a direct-current supply and/or control circuit for the direct-current supply and control of electronic components, which can be connected on the antenna-side interface, for which purpose a connecting line is provided between the evaluation and/or control electronic circuit and a corresponding portion of the main HF path in the GPS mast module.
12. GPS mast module according to claim 9 , characterized in that a direct-current supply can be provided via the further interface.
13. Mobile communication system comprising at least one satellite antenna (ANT) and one base station (BS), a main HF line/main HF path being provided between the base station (BS) and the satellite antenna (ANT) thereof for transmitting and/or receiving signals, characterized in that a Global Positioning System (GPS) mast module according to claim 1 is connected in the main HF line/main HF path.
14. Mobile communication system according to claim 13 , characterized in that a stop-band filter is used in the base station (BS), in particular so as to keep the frequency range of the satellite signal transmitted by the satellite antenna (GPS-ANT) free of interference spectra.
15. Mobile communication system according to claim 14 , characterized in that a separate GPS mast module is provided for each polarization in which the mobile communication antenna (ANT) transmits or receives.
16. Mobile communication system according to claim 13 , characterized in that a common GPS mast module is provided for two polarizations in which the mobile communication antenna (ANT) transmits and/or receives.
17. Mobile communication system according to claim 13 , characterized in that at least one GPS mast module is connected between a mobile communication antenna (ANT) and a low-noise reception amplifier, positioned closer to the mobile communication antenna device and further away from the base station (BS).
18. Mobile communication system according to claim 13 , characterized in that at least one GPS mast module is provided in the mobile communication antenna device (ANT), preferably inside a radome.
19. Mobile communication system according to claim 13 , characterized in that at least one GPS mast module is provided in a device for amplifying the receiving signals which is connected between the base station (BS) and the mobile communication antenna (ANT), preferably in the vicinity of the antenna (ANT).