Server of mobile communication base station and GPS signal selection method

Abstract

A server of a mobile communication base station comprises a GPS module, a plurality of GPS antennas, a processing unit and a switch. The GPS antennas are used for receiving GPS signals, and the frequencies of the GPS signals received by the GPS antennas are different. The processing unit is coupled to the GPS module and is used for providing a selection signal. The switch is coupled to the processing unit, the GPS module and the plurality of GPS antennas, and is used for selectively providing one of the plurality of GPS signals to the GPS module according to the selection signal.

Description

Technical Field

[0001] The present invention relates to a server for a mobile communication base station that supports multiple GPS antennas to achieve a non-single GPS system. Background Art

[0002] Generally, the signal transmission distance of the server of a mobile communication base station erected on a street lamp or a utility pole is short. Therefore, servers of mobile communication base stations distributed at multiple locations and synchronized are required to build a communication system without dead spots. Traditionally, the servers of mobile communication base stations distributed at various locations use the GPS system for phase positioning of time signals to ensure that information can be synchronized with the servers of other mobile communication base stations.

[0003] However, when the server encounters poor weather or is interfered with by others or other countries in its time signal, the signal reception and positioning of the GPS system of the server will be affected, causing the servers distributed at various locations to fail to achieve phase synchronization, and further resulting in the paralysis of the operation of the 5G communication system. Summary of the Invention

[0004] In some embodiments, a server of a mobile communication base station includes a GPS module, multiple GPS antennas, a processing unit, and a switch. Each of the GPS antennas is used to receive a GPS signal, and the frequencies of the GPS signals received by each of the GPS antennas are different. The processing unit is coupled to the GPS module and is used to provide a selection signal. The switch is coupled to the processing unit, the GPS module, and the GPS antennas, and is used to selectively provide one of the GPS signals to the GPS module according to the selection signal.

[0005] In some embodiments, the GPS module includes multiple GPS systems, and each of the GPS systems supports a different frequency. The processing unit is further used to provide a first control signal including information of a first frequency to the GPS module according to a frequency priority table. The GPS module turns on the GPS system corresponding to the first frequency according to the first control signal.

[0006] In some embodiments, the processing unit is further used to provide the selection signal to the switch according to the frequency priority table. The switch provides the GPS signal corresponding to the first frequency to the GPS module according to the selection signal.

[0007] In some embodiments, the first frequency is the highest priority in the frequency priority table.

[0008] In some embodiments, the GPS module is further configured to determine the carrier-to-noise ratio of the GPS signal after receiving the GPS signal. When the carrier-to-noise ratio of the GPS signal is lower than a set standard, the GPS module provides a determination signal to the processing unit. The processing unit provides a second control signal including information of a second frequency to the GPS module according to the determination signal and the frequency priority table. The GPS module turns on the GPS system corresponding to the second frequency according to the second control signal.

[0009] In some embodiments, the processing unit is further configured to provide the selection signal to the switch according to the determination signal and the frequency priority table. The switch provides the GPS signal corresponding to the second frequency to the GPS module according to the selection signal.

[0010] In some embodiments, the second frequency is the highest priority in the frequency priority table whose priority is lower than the frequency corresponding to the GPS signal.

[0011] In some embodiments, when the carrier-to-noise ratios of the GPS signals corresponding to all priorities in the frequency priority table are lower than the set standard, the processing unit provides a third control signal including information of a third frequency to the GPS module. The GPS module turns on the GPS system corresponding to the third frequency according to the third control signal. The third frequency is the frequency corresponding to the GPS signal with the best carrier-to-noise ratio among the GPS signals corresponding to all priorities in the frequency priority table.

[0012] In some embodiments, the processing unit is further configured to provide the selection signal to the switch according to the information of the third frequency. The switch provides the GPS signal corresponding to the third frequency to the GPS module according to the selection signal.

[0013] In some embodiments, the GPS module is further configured to decode the GPS signal to locate the server.

[0014] In some embodiments, the GPS antennas are patch antennas.

[0015] In some embodiments, a method for selecting a GPS signal is applicable to a server of a mobile communication base station. The server of the mobile communication base station includes a GPS module, a plurality of GPS antennas, a processing unit, and a switch. Each of the GPS antennas is used to receive a GPS signal, wherein the frequencies of the GPS signals received by each of the GPS antennas are different. And the GPS module includes a plurality of GPS systems, wherein each of the GPS systems supports a different frequency. The method for selecting a GPS signal includes: the processing unit provides a first control signal including information of a first frequency to the GPS module according to a frequency priority table; the GPS module turns on the GPS system corresponding to the first frequency according to the first control signal; the processing unit provides a selection signal to the switch according to the frequency priority table; and the switch provides the GPS signal corresponding to the first frequency to the GPS module according to the selection signal.

[0016] In some embodiments, the method for selecting a GPS signal further includes: the first frequency is the highest priority in the frequency priority table.

[0017] In some embodiments, the method for selecting a GPS signal further includes: after receiving the GPS signal, the GPS module determines the carrier-to-noise ratio of the GPS signal; when the carrier-to-noise ratio of the GPS signal is lower than a set standard, the GPS module provides a determination signal to the processing unit; the processing unit provides a second control signal including information of a second frequency to the GPS module according to the determination signal and the frequency priority table; the GPS module turns on the GPS system corresponding to the second frequency according to the second control signal; the processing unit provides the selection signal to the switch according to the determination signal and the frequency priority table; and the switch provides the GPS signal corresponding to the second frequency to the GPS module according to the selection signal.

[0018] In some embodiments, the method for selecting a GPS signal further includes: the second frequency is the highest priority in the frequency priority table whose priority is less than the frequency corresponding to the GPS signal whose carrier-to-noise ratio is lower than the set standard.

[0019] In some embodiments, the method for selecting the GPS signal further includes: when the carrier-to-noise ratios of the GPS signals corresponding to the frequencies of all priorities in the frequency priority table are lower than the set standard, the processing unit provides a third control signal including information of a third frequency to the GPS module; the GPS module turns on the GPS system corresponding to the third frequency according to the third control signal; the processing unit provides the selection signal to the switch according to the information of the third frequency; and the switch provides the GPS signal corresponding to the third frequency to the GPS module according to the selection signal. The third frequency is the frequency corresponding to the GPS signal having the best carrier-to-noise ratio among the GPS signals corresponding to the frequencies of all priorities in the frequency priority table.

[0020] Compared with the prior art, the beneficial effects of the present invention are that each of the GPS antennas in the server corresponds to a GPS system, that is, each of the GPS antennas is modulated to the center frequency of its corresponding GPS system to overcome the inherent narrow-band limitation in the structure of the patch antenna, so that the server can switch between these GPS systems to achieve phase positioning of the time signal without interruption. And the server in any embodiment will not be paralyzed in the communication operation of the entire server just because the accuracy of one of the GPS signals is affected by poor weather or interference from others.

[0021] The detailed features and advantages of the present invention will be described in detail in the following embodiments. The content is sufficient for any person skilled in the relevant art to understand the technical content of the present invention and implement it accordingly. And according to the content disclosed in this specification, the claims and the accompanying drawings of the specification, any person skilled in the relevant art can easily understand the relevant purposes and advantages of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Other features and effects of the present invention will be clearly presented in the embodiments with reference to the accompanying drawings, wherein:

[0023] Figure 1 It is a block diagram of an embodiment of a server for a mobile communication base station;

[0024] Figure 2 It is a block diagram of another embodiment of a server for a mobile communication base station; and

[0025] Figure 3 It is a flowchart of an embodiment of the method for selecting a GPS signal. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0026] Before the present invention is described in detail, it should be noted that in the following description, similar elements are denoted by the same reference numerals.

[0027] Please refer to Figure 1。The server 1 of the mobile communication base station includes a GPS module 20, a plurality of GPS antennas 40, a processing unit 10, and a switch 30. The processing unit 10 is coupled to the GPS module 20. The switch 30 is coupled to the processing unit 10, the GPS module 20, and the plurality of GPS antennas 40. Each GPS antenna 40 is used to receive GPS signals S3 with different center frequencies / different frequency bands.

[0028] In some embodiments, the server 1 is the server of a 5G base station, but the present invention is not limited thereto. In some embodiments, the server 1 may also be the server of a 6G base station or the server of a mobile communication base station of other mobile communication specifications with a GPS system evolved according to future technological developments.

[0029] In some embodiments, the processing unit 10 may be, but is not limited to, a central processing unit (CPU). In some embodiments, the switch 30 may be, but is not limited to, a radio frequency switch (RF Switch). In some embodiments, the plurality of GPS antennas 40 may be, but is not limited to, patch antennas. In some embodiments, the plurality of GPS antennas 40 receive according to the right-hand circular polarization (RHCP) rule towards the satellite to obtain the GPS signal S3. In some embodiments, the plurality of GPS antennas 40 may be, but is not limited to, designed with ceramic materials to reduce their volume.

[0030] In some embodiments, since the GPS antenna 40 is a patch antenna, and the patch antenna belongs to a narrow-bandwidth resonant wavelength antenna, the GPS antenna 40 can support at most plus or minus 20 MHz of bandwidth increase modulation. Therefore, it is impossible to design a single GPS antenna 40 as an antenna that can receive GPS signals S3 with multiple different frequencies to support various different GPS systems with different center frequencies. For example, the GPS antenna 40 supports the Galileo positioning system, and the center frequency of the Galileo GPS system is 1575.42 Mz. Therefore, the GPS antenna 40 can only receive GPS signals S3 in the frequency band from 1555.42 MHz to 1595.42 MHz, and the intensity of the GPS signal S3 that is more deviated from the center frequency (i.e., 1575.42 Mz) is worse. The center frequency of the Indian Regional Navigation Satellite System (IRNSS) in India is 1176.45 MHz. Therefore, it is impossible to make the GPS antenna 40 that supports Galileo also support IRNSS, because the center frequency of IRNSS (i.e., 1176.45 MHz) falls outside the frequency band of the GPS signals S3 that the GPS antenna 40 can receive (i.e., 1555.42 MHz to 1595.42 MHz).

[0031] Therefore, to enable the server 1 to support various different GPS systems, in some embodiments, each GPS antenna 40 supports a different GPS system. In other words, the center frequency / band of the GPS signal S3 that each GPS antenna 40 can receive is different. And in some embodiments, the GPS module 20 includes multiple GPS systems, and each GPS system supports a different center frequency / different bands. The processing unit 10 is used to provide a selection signal S2 to the switch 30. The switch 30 is used to selectively provide one of the multiple GPS signals S3 to the GPS module 20 according to the selection signal S2. In some embodiments, the GPS systems supported by the GPS antenna 40 and the GPS systems included in the GPS module 20 may be, but are not limited to, the Indian Regional Navigation Satellite System (IRNSS), the Galileo positioning system, the Global Navigation Satellite System (GLONASS), the BeiDou satellite navigation system (BDS), the DORIS system, or the Quasi-Zenith Satellite System (QZSS).

[0032] Please refer to Figure 1 and Figure 3 . In some embodiments, first, the processing unit 10 provides a first control signal S1a containing information of a first frequency to the GPS module 20 according to the frequency priority table (step S01). Then, the GPS module 20 turns on one of the multiple GPS systems included in the GPS module 20 corresponding to the first frequency according to the first control signal S1a (step S02). Then, the processing unit 10 provides a selection signal S2 to the switch 30 according to the frequency priority table (step S03). Finally, the switch 30 provides the GPS signal S3 received by the GPS antenna 40 corresponding to the first frequency to the GPS module 20 according to the selection signal S2 (step S04). In some embodiments, the first frequency may be, but is not limited to, the highest priority in the frequency priority table.

[0033] In some embodiments, the processing unit 10 includes a general-purpose input / output (GPIO). In some embodiments, the processing unit 10 provides the selection signal S2 to the switch 30 by setting the value of the pin of the GPIO. In Figure 1 the embodiment, the processing unit 10 includes a pin of a GPIO (i.e., pin 101), and the number of the multiple GPS antennas 40 is 2. Please refer to Figure 2 , in Figure 2In an embodiment, the processing unit 10 includes two GPIO pins (i.e., pin 101 and pin 102), and the number of multiple GPS antennas 40 is 4. However, the present invention is not limited thereto. The number of GPIO pins included in the processing unit 10 can be any number greater than 1, and the number of multiple GPS antennas 40 can be any number greater than 2. In some embodiments, assuming that the number of GPIO pins included in the processing unit 10 is n, then the number of multiple GPS antennas 40 is 2 to the power of n. For example, when the number of GPIO pins included in the processing unit 10 is 1, 2, 3, and 4 respectively, the number of multiple GPS antennas 40 is 2, 4, 8, and 16 respectively. For the convenience of description herein, Figure 1 the multiple GPS antennas 40 are respectively referred to as GPS antenna 41 and GPS antenna 42, and Figure 2 the multiple GPS antennas 40 are respectively referred to as GPS antenna 41, GPS antenna 42, GPS antenna 43, and GPS antenna 44. Figure 1 The relationship table between the values of the GPIO pins and the corresponding GPS antennas 40 is shown in Table 1 below. Figure 2 The relationship table between the values of the GPIO pins and the corresponding GPS antennas 40 is shown in Table 2 below.

[0034]

[0035] Table 1

[0036]

[0037] Table 2

[0038] Herein, taking Figure 2Examples of embodiments illustrate steps S01 to S04. By default, there is an antenna correspondence table. The antenna correspondence table includes 4 GPS antennas supporting different center frequencies and a frequency priority table. The 4 GPS antennas supporting different center frequencies are arranged in descending order of priority in the frequency priority table as GPS antenna 41 supporting the Galileo GPS system (corresponding center frequency is 1575.42 MHz), GPS antenna 42 supporting the GLONASS GPS system (corresponding center frequency is 1602 MHz), GPS antenna 43 supporting the BDS GPS system (corresponding center frequency is 1561.098 MHz), and GPS antenna 44 supporting the IRNSS GPS system (corresponding center frequency is 1176.45 MHz). The GPS systems included in the GPS module 20 are Galileo, GLONASS, BDS, and IRNSS. Among them, the antenna correspondence table is pre-stored in any memory (not shown in the figure) readable by the processing unit 10 of the server 1. This memory can be built into the server 1 or set in the server 1 in the form of an external memory. Thus, the user can update the antenna correspondence table stored in the built-in memory or external memory to simply add antenna data of new antennas, reduce redundant antenna data (such as antenna data corresponding to antennas whose physical antennas have been removed), change antenna data (for example, antenna data corresponding to an antenna whose physical antenna has been replaced with an antenna of another GPS system), change the priority of the antennas, and / or alternative antennas corresponding to each target antenna. First, the processing unit 10 provides a first control signal S1a containing information on the center frequency of Galileo to the GPS module 20 according to the frequency priority table (step S01). Next, the GPS module 20 turns on Galileo included in the GPS module 20 corresponding to the center frequency of Galileo according to the first control signal S1a (step S02). Then, the processing unit 10 sets the value of pin 101 to 0 and the value of pin 102 to 0 according to the frequency priority table to provide a selection signal S2 to the switch 30 (step S03). Finally, the switch 30 provides the GPS signal S3 received by the GPS antenna 41 corresponding to the center frequency of Galileo to the GPS module 20 according to the selection signal S2 (step S04).

[0039] In some embodiments, the GPS module 20 is further configured to determine the carrier-to-noise ratio of the GPS signal S3 after receiving the GPS signal S3 (step S05). When the carrier-to-noise ratio of the GPS signal S3 is lower than the set standard, first, the GPS module 20 provides a determination signal S4 to the processing unit 10 (step S06). Then, the processing unit 10 provides a second control signal S1b containing information on the second frequency to the GPS module 20 according to the determination signal S4 and the frequency priority table (step S07), and the GPS module 20 turns on the GPS system corresponding to the second frequency according to the second control signal S1b (step S08). Then, the processing unit 10 provides a selection signal S2 to the switch 30 according to the determination signal S4 and the frequency priority table (step S09), and the switch 30 provides the GPS signal S3 corresponding to the second frequency to the GPS module 20 according to the selection signal S2 (step S10). In some embodiments, the second frequency may be, but is not limited to, the highest priority in the frequency priority table that is less than the frequency corresponding to the GPS signal S3 with a carrier-to-noise ratio lower than the set standard.

[0040] Continuing with the above example to illustrate steps S05 to S10. After the GPS module 20 receives the GPS signal S3 received by the GPS antenna 41 corresponding to the center frequency of Galileo, it determines the carrier-to-noise ratio (Carrier To Noise Ratio) of this GPS signal S3 (step S05). When the carrier-to-noise ratio of this GPS signal S3 is lower than the set standard, first, the GPS module 20 provides a determination signal S4 to the processing unit 10 (step S06). Then, the processing unit 10 provides a second control signal S1b containing information on the center frequency of GLONASS (since the center frequency of GLONASS is the second highest priority in the frequency priority table) to the GPS module 20 according to the determination signal S4 and the frequency priority table (step S07), and the GPS module 20 turns on the GLONASS included in the GPS module 20 corresponding to the center frequency of GLONASS according to the second control signal S1b (step S08). Then, the processing unit 10 sets the value of pin 101 to 0 and the value of pin 102 to 1 to provide a selection signal S2 to the switch 30 according to the determination signal S4 and the frequency priority table (step S09), and the switch 30 provides the GPS signal S3 received by the GPS antenna 42 corresponding to the center frequency of GLONASS to the GPS module 20 according to the selection signal S2 (step S10).

[0041] In some embodiments, when the carrier-to-noise ratios of multiple GPS signals S3 corresponding to the frequencies of all priorities in the frequency priority table are all lower than the set standard, the processing unit 10 further provides a third control signal S1c containing information on the third frequency to the GPS module 20 (step S11), and the GPS module 20 turns on the GPS system corresponding to the third frequency according to the third control signal S1c (step S12). Then, the processing unit 10 provides a selection signal S2 to the switch 30 according to the information on the third frequency (step S13), and the switch 30 provides the GPS signal S3 corresponding to the third frequency to the GPS module 20 according to the selection signal S2 (step S14). The third frequency is the frequency corresponding to the GPS signal S3 with the best carrier-to-noise ratio among the multiple GPS signals S3 corresponding to the frequencies of all priorities in the frequency priority table.

[0042] Continuing with the above example to illustrate steps S11 to S14. Assume that the frequency corresponding to the GPS signal S3 with the best carrier-to-noise ratio among the multiple GPS signals S3 corresponding to the frequencies of all priorities in the frequency priority table is the center frequency of BDS. When the carrier-to-noise ratios of the multiple GPS signals S3 corresponding to the frequencies of all priorities in the frequency priority table are all lower than the set standard, the processing unit 10 provides a third control signal S1c containing information on the center frequency of BDS to the GPS module 20 (step S11), and the GPS module 20 turns on the BDS included in the GPS module 20 corresponding to the center frequency of BDS according to the third control signal S1c (step S12). Then, the processing unit 10 sets the value of pin 101 to 1 and the value of pin 102 to 0 according to the information on the center frequency of BDS to provide the selection signal S2 to the switch 30 (step S13), and the switch 30 provides the GPS signal S3 received by the GPS antenna 43 corresponding to the center frequency of BDS to the GPS module 20 according to the selection signal S2 (step S14).

[0043] In some embodiments, the switch 30 is located in the GPS module 20. In some embodiments, the processing unit 10, the GPS module 20, and the switch 30 are integrated on the same chip. In some embodiments, the server 1 further includes multiple 5G antennas for receiving 5G signals. In some embodiments, the multiple GPS systems in the GPS module 20 are further used to decode the GPS signal S3 to locate the server 1, so as to synchronize the phases of the servers 1 at various locations, ensuring that the information of the servers 1 at various locations can be synchronized with other servers 1. In some embodiments, the user controls the processing unit 10, the GPS module 20, and the switch 30 through a software system (OS) to cause the server 1 to execute steps S01 to S14.

[0044] In some embodiments, the user directly controls the processing unit 10 through the software system instead of through the frequency priority table to enable the GPS module 20 to turn on the GPS system that the user desires to turn on and enable the switch 30 to provide the GPS signal S3 corresponding to the GPS system that the user desires to turn on to the GPS module 20. For Figure 2 taking the embodiment as an example, if the user desires to enable the GPS module 20 to receive the signal of IRNSS, the user connects to the operating software system through the input device in a wired or wireless manner to directly control the processing unit 10 through the software system, so that the processing unit 10 provides an enabling signal to the GPS module 20 to enable it to turn on IRNSS. Then, the user enables the processing unit 10 through the software system to set the value of the pin 101 to 1 and the value of the pin 102 to 1 to provide the selection signal S2 to the switch 30, and the switch 30 provides the GPS signal S3 received by the GPS antenna 44 corresponding to the center frequency of IRNSS to the GPS module 20 according to the selection signal S2. After the GPS module 20 receives the GPS signal S3, the IRNSS in the GPS module 20 decodes the GPS signal S3 to locate the server 1.

[0045] In some embodiments, when the carrier-to-noise ratio of the GPS signal S3 received by the GPS module 20 is lower than the set standard, the user directly controls the processing unit 10 through the software system instead of through the frequency priority table to enable the GPS module 20 to turn on the GPS system that the user desires to turn on and enable the switch 30 to provide the GPS signal S3 corresponding to the GPS system that the user desires to turn on to the GPS module 20.

[0046] In some embodiments, when the carrier-to-noise ratios of multiple GPS signals S3 corresponding to the frequencies of all priorities in the frequency priority table are all lower than the set standard, the user directly controls the processing unit 10 through the software system instead of through the GPS signal S3 with the best carrier-to-noise ratio among the multiple GPS signals S3 corresponding to the frequencies of all priorities in the frequency priority table to enable the GPS module 20 to turn on the GPS system that the user desires to turn on and enable the switch 30 to provide the GPS signal S3 corresponding to the GPS system that the user desires to turn on to the GPS module 20.

[0047] In summary, each GPS antenna 40 in the server 1 corresponds to a GPS system, that is, each GPS antenna 40 is modulated to the center frequency of its corresponding GPS system to overcome the inherent narrow-band limitation in the structure of the patch antenna, so that the server 1 can switch between multiple GPS systems to achieve phase positioning of the time signal without interruption. And the server 1 in any embodiment will not be paralyzed in the communication operation of the entire server 1 because the accuracy of one of the GPS signals S3 is affected by poor weather or interference from others.

[0048] The above are only specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention can easily think of changes or substitutions, which should all be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. A server of a mobile communication base station, characterized in that, Comprising: A GPS module; A plurality of GPS antennas, each of which is used to receive a GPS signal, and the frequencies of the GPS signals received by each GPS antenna are different; A processing unit, coupled to the GPS module, for providing a selection signal; and A switch, coupled to the processing unit, the GPS module and the GPS antennas, for selectively providing one of the GPS signals to the GPS module according to the selection signal.

2. The server according to claim 1, wherein The GPS module includes a plurality of GPS systems, each GPS system supporting a different frequency. The processing unit is further configured to provide a first control signal including information of a first frequency to the GPS module according to a frequency priority table, and the GPS module turns on the GPS system corresponding to the first frequency according to the first control signal.

3. The server according to claim 2, wherein The processing unit is further configured to provide the selection signal to the switch according to the frequency priority table, and the switch provides the GPS signal corresponding to the first frequency to the GPS module according to the selection signal.

4. The server according to claim 3, wherein The first frequency is the highest priority in the frequency priority table.

5. The server according to claim 4, characterized in that, The GPS module is further configured to, after receiving the GPS signal, determine the carrier-to-noise ratio of the GPS signal. When the carrier-to-noise ratio of the GPS signal is lower than a set standard, the GPS module provides a judgment signal to the processing unit. The processing unit provides a second control signal including information of a second frequency to the GPS module according to the judgment signal and the frequency priority table, and the GPS module turns on the GPS system corresponding to the second frequency according to the second control signal.

6. The server according to claim 5, wherein The processing unit is further configured to provide the selection signal to the switch according to the judgment signal and the frequency priority table, and the switch provides the GPS signal corresponding to the second frequency to the GPS module according to the selection signal.

7. The server according to claim 6, characterized in that, The second frequency is the highest priority in the frequency priority table whose priority is less than the frequency corresponding to the GPS signal.

8. The server according to claim 7, wherein When the carrier-to-noise ratios of the GPS signals corresponding to all the priorities in the frequency priority table are lower than the set standard, the processing unit provides a third control signal including information of a third frequency to the GPS module, and the GPS module turns on the GPS system corresponding to the third frequency according to the third control signal, where the third frequency is the frequency corresponding to the GPS signal having the best carrier-to-noise ratio among the GPS signals corresponding to all the frequencies of the priorities in the frequency priority table.

9. The server according to claim 8, wherein The processing unit is further configured to provide the selection signal to the switch according to the information of the third frequency, and the switch provides the GPS signal corresponding to the third frequency to the GPS module according to the selection signal.

10. The server according to claim 1, characterized in that, The GPS module is further configured to decode the GPS signal to locate the server.

11. The server according to claim 1, wherein The GPS antennas are patch antennas.

12. A method for selecting a GPS signal, applicable to a server of a mobile communication base station. The server of the mobile communication base station includes a GPS module, multiple GPS antennas, a processing unit, and a switch. Each of the GPS antennas is used to receive a GPS signal, wherein the GPS signals received by each of the GPS antennas have different frequencies, and the GPS module includes multiple GPS systems, and each of the GPS systems supports different frequencies. It is characterized in that, The selection method includes: The processing unit provides a first control signal including information of a first frequency to the GPS module according to a frequency priority table; The GPS module turns on the GPS system corresponding to the first frequency according to the first control signal; The processing unit provides a selection signal to the switch according to the frequency priority table; and The switch provides the GPS signal corresponding to the first frequency to the GPS module according to the selection signal.

13. The selection method according to claim 12, characterized in that, The first frequency is the highest priority in the frequency priority table.

14. The selection method according to claim 13, wherein Further included are: After receiving the GPS signal, the GPS module determines the carrier-to-noise ratio of the GPS signal; When the carrier-to-noise ratio of the GPS signal is lower than a set standard, the GPS module provides a determination signal to the processing unit; The processing unit provides a second control signal including information of a second frequency to the GPS module according to the determination signal and the frequency priority table; The GPS module turns on the GPS system corresponding to the second frequency according to the second control signal; The processing unit provides the selection signal to the switch according to the determination signal and the frequency priority table; and The switch provides the GPS signal corresponding to the second frequency to the GPS module according to the selection signal.

15. The selection method according to claim 14, characterized in that, The second frequency is the highest priority among the frequencies in the frequency priority table whose priorities are less than the frequency corresponding to the GPS signal with a carrier-to-noise ratio lower than the set standard.

16. The selection method according to claim 15, characterized in that Further included are: When the carrier-to-noise ratios of the GPS signals corresponding to all the priorities in the frequency priority table are lower than the set standard, the processing unit provides a third control signal including information of a third frequency to the GPS module; The GPS module turns on the GPS system corresponding to the third frequency according to the third control signal; The processing unit provides the selection signal to the switch according to the information of the third frequency; and The switch provides the GPS signal corresponding to the third frequency to the GPS module according to the selection signal; wherein the third frequency is the frequency corresponding to the GPS signal with the best carrier-to-noise ratio among the GPS signals corresponding to all the priorities in the frequency priority table.

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