Communication base station equipment GPSDO test device and method

Abstract

The present invention provides a communication base station equipment GPSDO test device and method, the device includes: a signal generating device and a signal analyzing device; the signal generating device is used to convert the acquired baseband GPS data into a GPS radio frequency signal, and transmit the GPS radio frequency signal to the base station equipment to be tested in the GPS frequency band; the signal analyzing device is used to demodulate the test signal to obtain the carrier frequency of the test signal, and determine whether the base station equipment to be tested has the performance of obtaining a reference clock from the GPS radio frequency signal according to the carrier frequency of the test signal; wherein the test signal is generated by the base station equipment to be tested based on the GPS radio frequency signal. This solution only uses a signal generating device and a signal analyzing device, and can directly determine whether the base station equipment to be tested has the performance of obtaining a reference clock from the GPS radio frequency signal. Compared with the two measurement methods in the prior art, the device of the present invention is simple, flexible, accurate in testing, and low in cost.

Description

Technical Field

[0001] The present invention relates to the technical field of base station performance testing, and in particular to a GPSDO testing device and method for communication base station equipment. Background Art

[0002] Communication base stations have high requirements for time synchronization and frequency stability. In order for each base station to work at the same frequency and clock and clock frequency, it is necessary to provide a unified time and frequency reference for all base stations in the network. When the base station equipment is working, all its frequency / time related signal outputs, such as carrier frequency, are derived from its reference clock, which is the result of frequency multiplication through the phase-locked loop inside the equipment. Only when all base station reference clocks are consistent can the frequency and time parameters of the signals output by all base stations be guaranteed to be consistent.

[0003] Since GPS (Global Positioning System) includes a strict timing system, it has become a relatively common benchmark provider. Operators also put forward requirements for this function of base stations during the testing of base stations. GPS signals provide time, location and 1PPS signal (1 Pulse Per second). The accuracy of this 1PPS is guaranteed by the GPS system. The reference clock used by the base station is usually 10MHz. The device that restores the precise 1PPS signal provided by the GPS system to a 10MHz reference clock that can be used by the base station is the GPS disciplined oscillator (GPSDO).

[0004] There are two existing methods to determine whether a base station has the ability to obtain a reference clock from the GPS system:

[0005] A commonly used method is to use another base station that is known to obtain clocks from GPS to interconnect with the base station under test, and to enable the base station to communicate through the air interface / X2 interface by setting relevant settings on the base station. Since both parties use their own clocks in these communications, if the communication between the two parties can be established and continue to be stable, it means that both parties use the same reference clock, that is, the clock of the device under test is also obtained from GPS; otherwise, it means that the clock of the device under test does not meet the requirements.

[0006] Technically speaking, this method is actually an indirect method of testing the EUT (Equipment Under Test) with a qualified EUT, and is not a direct test of the function. If the communication cannot be established stably, there may be problems caused by other processes in the communication process, and it cannot be simply judged that the EUT does not meet the requirements.

[0007] From a feasibility point of view, due to the complexity of the base station itself, the control must be completed by the EUT manufacturer's staff. Since it is impossible to directly operate the base station, this method is difficult to apply to most third-party laboratories.

[0008] The test method used in the laboratory is usually the comparison method. When the device under test does not have the GPS clock acquisition function or cannot obtain the GPS signal, the device under test will use its local frequency source to generate all signals. Since the local frequency source (crystal oscillator) used in actual base station equipment usually has a large error, its output frequency can be detected by a standard frequency source, such as a rubidium clock.

[0009] When the device under test is placed in an open area with GPS signals (in an open area where GPS can be received) and in a shielded room without GPS signals, the carrier frequency of the signal generated by it is tested respectively. If the frequency deviation between the two is obvious, and the carrier frequency error is significantly reduced when GPS signals are present, it can be determined that the device under test has the function of obtaining GPS clock. If there is no obvious difference in the carrier frequency generated in the two states, and the errors are both relatively large, it can be determined that the device under test has not obtained the reference clock from GPS.

[0010] Technically, this solution is also not a direct test of the function. If the EUT's internal crystal oscillator has excellent performance, the carrier frequency error may be very small regardless of whether the GPS signal is present. In this case, it is impossible to determine the source of the reference clock. In addition, the "obvious difference" in the clock signal between the two states in this method is difficult to determine the indicator limit.

[0011] From an operational perspective, in order to ensure accurate frequency measurement, a standard clock source (such as a rubidium clock) needs to be used as a reference when performing frequency measurement, which results in high testing costs. Summary of the invention

[0012] The embodiment of the present invention provides a communication base station equipment GPSDO testing device and method, which solves the technical problem of inaccurate communication base station equipment GPSDO testing using two methods in the prior art.

[0013] A communication base station device GPSDO test device provided by an embodiment of the present invention comprises: a signal generating device and a signal analyzing device;

[0014] The signal generating device is used to: convert the acquired baseband GPS data into GPS radio frequency signals, and transmit the GPS radio frequency signals to the base station device to be tested in the GPS frequency band;

[0015] The signal analysis device is used to: demodulate the test signal to obtain the carrier frequency of the test signal, and determine whether the base station device to be tested has the performance of obtaining a reference clock from the GPS radio frequency signal according to the carrier frequency of the test signal;

[0016] The test signal is generated by the base station device to be tested based on the GPS radio frequency signal.

[0017] A communication base station device GPSDO testing method provided by an embodiment of the present invention includes:

[0018] The signal generating device converts the acquired baseband GPS data into GPS radio frequency signals, and transmits the GPS radio frequency signals to the base station device to be tested in the GPS frequency band;

[0019] The base station device to be tested generates a test signal based on the GPS radio frequency signal;

[0020] The signal analysis device demodulates the test signal to obtain the carrier frequency of the test signal, and determines whether the base station device to be tested has the performance of obtaining a reference clock from the GPS radio frequency signal according to the carrier frequency of the test signal.

[0021] An embodiment of the present invention further provides a computer device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the above-mentioned method when executing the computer program.

[0022] An embodiment of the present invention further provides a computer-readable storage medium, wherein the computer-readable storage medium stores a computer program for executing the above method.

[0023] In the embodiment of the present invention, only a signal generating device and a signal analyzing device are used to directly determine whether the base station device to be tested has the performance of obtaining a reference clock from a GPS radio frequency signal. Compared with the two measurement methods in the prior art, the device of the present invention is simple, flexible, accurate in testing, and low in cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0025] Figure 1 It is a schematic diagram of the structure 1 of a communication base station equipment GPSDO testing device provided by an embodiment of the present invention;

[0026] Figure 2It is a schematic diagram of structure 2 of a communication base station equipment GPSDO testing device provided by an embodiment of the present invention;

[0027] Figure 3 It is a schematic diagram of structure 3 of a communication base station equipment GPSDO testing device provided by an embodiment of the present invention;

[0028] Figure 4 It is a schematic diagram of the structure 4 of a communication base station equipment GPSDO testing device provided by an embodiment of the present invention;

[0029] Figure 5 It is a schematic diagram of the structure 5 of a communication base station equipment GPSDO testing device provided by an embodiment of the present invention;

[0030] Figure 6 6 is a schematic diagram of the structure of a GPSDO testing device for a communication base station device provided by an embodiment of the present invention;

[0031] Figure 7 It is a schematic diagram of the structure 7 of a communication base station equipment GPSDO testing device provided by an embodiment of the present invention;

[0032] Figure 8 It is a schematic diagram of the structure 8 of a communication base station equipment GPSDO testing device provided by an embodiment of the present invention;

[0033] Fig. 9 This is a communication base station equipment GPSDO test method process provided by an embodiment of the present invention Figure 1 ;

[0034] Fig.10 This is a communication base station equipment GPSDO test method process provided by an embodiment of the present invention Figure 2 ;

[0035] Fig.11 This is a communication base station equipment GPSDO test method process provided by an embodiment of the present invention Figure 3 . DETAILED DESCRIPTION

[0036] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0037] The core problem to be solved by the present invention is to directly test the GPSDO module, that is, to directly answer the question of "whether the base station clock is derived from the GPS signal", thereby fundamentally solving the above test of the base station GPS clock acquisition function. Based on this, the present invention proposes a communication base station equipment GPSDO test device, such as Figure 1 As shown, the device comprises: a signal generating device and a signal analyzing device;

[0038] The signal generating device is used to: convert the acquired baseband GPS data into GPS radio frequency signals, and transmit the GPS radio frequency signals to the base station device to be tested in the GPS frequency band;

[0039] The signal analysis device is used to: demodulate the test signal to obtain the carrier frequency of the test signal, and determine whether the base station device to be tested has the performance of obtaining a reference clock from the GPS radio frequency signal according to the carrier frequency of the test signal;

[0040] The test signal is generated by the base station device to be tested based on the GPS radio frequency signal.

[0041] The signal analysis device may be a spectrum analyzer.

[0042] The signal generating device may be a software defined radio (SDR) board.

[0043] In the embodiment of the present invention, Figure 2 As shown, the device may further include: a PC, wherein the baseband GPS data is stored on the PC;

[0044] The PC is used to send the baseband GPS data to the software radio SDR board card, and drive the software radio SDR board card to send out GPS radio frequency signals.

[0045] The above description shows that the PC has its own memory, which can also be external. Figure 3 As shown, the device may also include: a PC and a memory;

[0046] The memory is used to: store baseband GPS data;

[0047] The PC is used to obtain baseband GPS data from the memory, send the baseband GPS data to the software radio SDR board card, and drive the software radio SDR board card to send out GPS radio frequency signals.

[0048] Use PC to directly drive SDR board to send signal, which is the lowest cost.

[0049] In the embodiment of the present invention, Figure 4As shown, the device may further include: a Mini-PC, wherein the Mini-PC is a circuit, board or module having SDR driving capability;

[0050] The Mini-PC is used to send the baseband GPS data to the software radio SDR board card, and drive the software radio SDR board card to send out GPS radio frequency signals.

[0051] The above description shows that the Mini-PC has its own memory, which can also be external. Figure 5 As shown, the device may further include: a Mini-PC and a memory; the Mini-PC is a circuit, board or module with SDR driving capability;

[0052] The memory is used to: store baseband GPS data;

[0053] The Mini-PC is used for: acquiring baseband GPS data from the memory, sending the baseband GPS data to the software radio SDR board card, and driving the software radio SDR board card to send out GPS radio frequency signals.

[0054] Mini-PC refers to circuits, boards or modules with SDR driving capabilities, such as single-board computers such as Raspberry Pi and pcDuino. The advantage of this is that the driving circuit and SDR board can be placed in the same chassis and used as an integrated instrument. It can be controlled by the host computer (PC) or directly on this instrument.

[0055] In the above two structures of the communication base station equipment GPSDO test device, the SDR board acts as a signal generator, converting the baseband digital signal transmitted from the PC / Mini-PC into a radio frequency signal and transmitting it. The PC / Mini-PC contains a program for reading the baseband signal from the memory, a driver for the SDR board, and a control program for transmitting the signal to the SDR board and controlling it to send the signal. This set of equipment can read the GPS baseband data in the memory from the memory, and call the SDR board to transmit it in the correct GPS frequency band. The baseband GPS data stored in the memory can come from the result of program operation or from the recorded data at a specific GPS frequency point at a certain time.

[0056] In the embodiment of the present invention, Figure 6 As shown, the signal generating device may also be a PC including a software defined radio (SDR) board, and the baseband GPS data is stored on the PC.

[0057] In addition, if Figure 7As shown, the signal generating device can also be a PC including a software defined radio (SDR) board; the device also includes a memory for storing the baseband GPS data.

[0058] When the memory is an external memory, the memory may include a USB flash drive, an SD card, or a TF card inserted in a PC.

[0059] This device can generate actual GPS signals in the GPS frequency band. Using spatial coupling, the signal can be transmitted to the base station. When the device is turned on, the GPSDO module in the base station will analyze the GPS signal sent by this device, and use it as a reference to generate test signals. The test signal generation process includes clock synchronization and frequency generation.

[0060] Specifically, in order to verify whether the GPSDO module inside the EUT correctly restores the reference clock from the GPS signal, the time interval of the 1PPS timing in the GPS signal sent by the signal generator can be changed to observe the change of the EUT output carrier frequency. If the EUT output carrier frequency does not change with the above changes, it can be determined that the EUT does not have the function of obtaining the clock from the GPS signal; otherwise, it can be determined that the EUT can obtain the reference clock from the GPS signal.

[0061] There are two methods to change the 1PPS timing time interval in the GPS signal sent by the signal generating device: changing its reference clock frequency, or changing its sampling rate of the baseband signal.

[0062] 1. Change the reference clock frequency

[0063] (1) Set the reference clock frequency of the signal generating device to f1 = 10 MHz, and all clocks on the SDR board will use this clock as the reference.

[0064] (2) Use a signal generating device to send out GPS signals.

[0065] (3) When the EUT clock is confirmed to be stable, the signal analysis device measures the carrier frequency f of the first test signal output by the EUT. c1 Take measurements.

[0066] (4) Turn off the GPS signal emitted by the signal generating device, and set the reference clock frequency of the signal generating device to f2 = f1 (1 + δppm).

[0067] (5) Use a signal generating device to send out GPS signals.

[0068] (6) When the EUT clock is confirmed to be stable, the signal analysis device measures the carrier frequency f of the second test signal output by the EUT.c2 Take measurements.

[0069] (7) When f c2 / f c1 When ≈1+δppm, it is considered that the reference clock of the EUT can be obtained from the GPS signal.

[0070] 2. Change the baseband signal sampling rate of the SDR board

[0071] (1) The onboard clock of the signal generator is used directly for measurement without connecting to an external reference clock input.

[0072] (2) Use the signal generating device to send out GPS signals. The signal sampling rate at this time is set to f s1 .

[0073] (3) When the EUT clock is confirmed to be stable, the signal analysis device measures the carrier frequency f of the first test signal output by the EUT. c1 Take measurements.

[0074] (4) Turn off the GPS signal from the signal generator and set the sampling clock frequency of the test equipment to f s2 =f s1 (1+δppm).

[0075] (5) Use a signal generating device to send out GPS signals.

[0076] (6) When the EUT clock is confirmed to be stable, the signal analysis device measures the carrier frequency f of the second test signal output by the EUT. c2 Take measurements.

[0077] (7) When f c2 / f c1 When ≈1+δppm, it is considered that the reference clock of the EUT can be obtained from the GPS signal.

[0078] Method 1 is suitable for testing in a laboratory environment. A stable and reliable clock source can be provided in the laboratory environment, and the frequency of this clock source can be accurately adjusted. Using this method, not only can the test items of EUT obtaining clock from GPS be tested, but also the relevant parameters of EUT clock acquisition can be quantitatively measured.

[0079] Method 2 does not require any external auxiliary equipment. The onboard clock source can be used directly to test the test item of EUT obtaining clock from GPS. It is suitable for the test scenario of verifying this function alone.

[0080] When calculating the error limit, in step (7) of the above method, it is necessary to calculate f c2 / f c1Due to the noise interference in the actual test, there will be certain measurement errors and uncertainties in the test. According to the LTE base station test specification (3GPP 36.104), the carrier frequency deviation should not be greater than 0.05ppm (ppm means one part per million).

[0081] When the reference signal frequency is f1, the device under test outputs a carrier frequency f c1 It should be between (1-0.05ppm)f1×R and (1+0.05ppm)f1×R, where R is the ratio of the frequency multiplication. When the reference signal frequency is f2=f1(1+δppm), the carrier frequency f output by the device under test is c2 It should be between (1-0.05ppm)f1(1+δppm)×R and (1+0.05ppm)f1(1+δppm)×R.

[0082] Therefore, it can be calculated that the actual f c2 / f c1 The following requirements should be met:

[0083]

[0084] Wherein, δ represents the numerical change rate between the first signal sampling rate and the second signal sampling rate, or the numerical change rate between the first reference clock frequency and the second reference clock frequency.

[0085] That is, when the ratio of the two satisfies the above formula, it can be considered that f c2 / f c1 ≈1+δppm.

[0086] Therefore, for the test method of changing the sampling rate of the baseband signal, the signal generating device is specifically used for:

[0087] Sampling the baseband GPS data at a first signal sampling rate to obtain a first GPS radio frequency signal, and transmitting the first GPS radio frequency signal to a base station device to be tested;

[0088] Sampling the baseband GPS data at a second signal sampling rate to obtain a second GPS radio frequency signal, and transmitting the second GPS radio frequency signal to the base station device to be tested;

[0089] The signal analysis device is used for:

[0090] Demodulating the first test signal to obtain a carrier frequency of the first test signal;

[0091] Demodulating the second test signal to obtain a carrier frequency of the second test signal;

[0092] Determining whether the base station device to be tested has the performance of obtaining a reference clock from a GPS radio frequency signal according to the carrier frequency of the first test signal and the carrier frequency of the second test signal;

[0093] The first test signal is generated by the base station device under test based on the first GPS radio frequency signal; the second test signal is generated by the base station device under test based on the second GPS radio frequency signal.

[0094] For the second test method of changing the reference clock frequency, the signal generating device is specifically used for:

[0095] Sending a first GPS radio frequency signal based on a first reference clock frequency;

[0096] Sending a second GPS radio frequency signal based on a second reference clock frequency;

[0097] The signal analysis device is used for:

[0098] Demodulating the first test signal to obtain a carrier frequency of the first test signal;

[0099] Demodulating the second test signal to obtain a carrier frequency of the second test signal;

[0100] Determining whether the base station device to be tested has the performance of obtaining a reference clock from a GPS radio frequency signal according to the carrier frequency of the first test signal and the carrier frequency of the second test signal;

[0101] The first test signal is generated by the base station device under test based on the first GPS radio frequency signal; the second test signal is generated by the base station device under test based on the second GPS radio frequency signal.

[0102] The signal analysis device is specifically used for:

[0103] The ratio of the carrier frequency of the first test signal to the carrier frequency of the second test signal is determined. When the ratio is equal to a preset threshold, it indicates that the base station device to be tested has the performance of obtaining a reference clock from the GPS radio frequency signal.

[0104] In the embodiment of the present invention, Figure 8 As shown, the device also includes: a signal source, used to provide a reference clock frequency for the signal generating device.

[0105] The device of the present invention is described below by means of specific embodiments.

[0106] Example 1: A functional test of "whether the reference clock can be obtained from the GPS signal" is required for a certain model of LTE base station.

[0107] The carrier center frequency of the base station equipment is 2340MHz. If the test is conducted in a laboratory, that is, accurate frequency standard equipment and clock equipment (such as rubidium clock, signal source) can be provided, method 1 can be used for testing. The connection of the test equipment is as follows: Figure 8 As shown:

[0108] The test case is described as follows:

[0109] (1) Set the reference clock frequency of the signal generating device to f1 = 10 MHz.

[0110] (2) Use a signal generating device to send out GPS signals.

[0111] (3) When the EUT clock is confirmed to be stable, use the test function of the signal analysis device to measure the carrier frequency f of the first test signal output by the EUT. c1 Measure f c1 =2340000013.35Hz. (If the reference clock of the EUT is restored from the GPS signal sent by the signal generator, the carrier frequency deviation of the signal sent by the EUT should be very small).

[0112] (4) Turn off the GPS signal emitted by the signal generating device, and set the reference clock frequency of the signal generating device to f2 = f1 (1 + 4 ppm), that is, 10.00004 MHz.

[0113] (5) Use a signal generating device to send out GPS signals.

[0114] (6) When the EUT clock is confirmed to be stable, the signal analysis device measures the carrier frequency of the second test signal output by the EUT. The measured f c2 =2340009376.05MHz.

[0115] (7) Measured f c2 / f c1 =1.0000040012, which is consistent with formula (1), that is, it is considered that the reference clock of the EUT can be obtained from the GPS signal.

[0116] Example 2:

[0117] For example, a certain model of LTE base station needs to be tested for "whether the reference clock can be obtained from the GPS signal". The carrier center frequency of the base station equipment is 2575MHz. If method 2 is used, only the test equipment is used for testing. The connection of the test equipment is as follows: Figure 1 As shown:

[0118] The test case is described as follows:

[0119] (1) The onboard clock of the signal generator is used directly for measurement without connecting to an external reference clock input.

[0120] (2) Use the signal generating device to send out GPS signals. The signal sampling rate at this time is set to f s1 The actual sampling frequency used is 2.6MHz.

[0121] (3) When the EUT clock is confirmed to be stable, the signal analysis device measures the carrier frequency f of the first test signal output by the EUT. c1 Measure f c1 =25749999713.35Hz. Since there is no standard frequency standard equipment in the system at this time, even if the reference clock of the base station is derived from the GPS signal, this reference clock is inaccurate.

[0122] (4) Turn off the GPS signal from the signal generator and set the sampling clock frequency of the signal generator to f s2 =2.600008MHz, that is, f s1 (1+3.077ppm).

[0123] (5) Use a signal generating device to send out GPS signals.

[0124] (6) When the EUT clock is confirmed to be stable, the signal analysis device measures the carrier frequency f of the second test signal output by the EUT. c2 Measure f c2 =25749999805.77Hz.

[0125] (7) Calculation shows that f c2 / f c1 ≈1.0000000036. Since it does not conform to formula (1), it is considered that the EUT reference clock is independent of the external GPS timing, that is, the EUT does not have the function of obtaining the reference clock from the GPS signal.

[0126] Since there is no absolute frequency standard device, the reference clocks of the signal generator and the signal analyzer are not strictly accurate. Therefore, the frequency test results obtained from the signal analyzer may have a certain deviation. However, since the internal reference clock of the signal analyzer is stable in a short period of time, the reference clock of the signal generator and the signal analyzer is stable in a short period of time. c1 and f c2 When the ratio is , the measurement error caused by the internal reference clock will be offset.

[0127] Based on the same inventive concept, a communication base station device GPSDO test method is also provided in an embodiment of the present invention, as described in the following embodiment. Since the principle of solving the problem by the communication base station device GPSDO test method is similar to that of the communication base station device GPSDO test device, the implementation of the communication base station device GPSDO test method can refer to the implementation of the communication base station device GPSDO test device, and the repeated parts will not be repeated.

[0128] Fig. 9 : is a flow chart of a GPSDO testing method for a communication base station device according to an embodiment of the present invention. Fig. 9 As shown, including:

[0129] Step 901: The signal generating device converts the acquired baseband GPS data into a GPS radio frequency signal, and transmits the GPS radio frequency signal to the base station device to be tested in the GPS frequency band;

[0130] Step 902: The base station device to be tested generates a test signal based on the GPS radio frequency signal;

[0131] Step 903: The signal analysis device demodulates the test signal to obtain the carrier frequency of the test signal, and determines whether the base station device to be tested has the performance of obtaining a reference clock from the GPS radio frequency signal according to the carrier frequency of the test signal.

[0132] In the embodiment of the present invention, Fig.10 As shown, step 901 to step 903 specifically include:

[0133] S11: a signal generating device samples the baseband GPS data at a first signal sampling rate to obtain a first GPS radio frequency signal, and transmits the first GPS radio frequency signal to a base station device to be tested;

[0134] S12: The signal generating device samples the baseband GPS data at a second signal sampling rate to obtain a second GPS radio frequency signal, and transmits the second GPS radio frequency signal to the base station device to be tested;

[0135] S13: The base station device to be tested generates a first test signal based on the first GPS radio frequency signal;

[0136] S14: The base station device to be tested generates a second test signal based on the second GPS radio frequency signal;

[0137] S15: The signal analysis device demodulates the first test signal to obtain a carrier frequency of the first test signal;

[0138] S16: The signal analysis device demodulates the second test signal to obtain a carrier frequency of the second test signal;

[0139] S17: The signal analysis device determines whether the base station device to be tested has the ability to obtain a reference clock from the GPS radio frequency signal according to the carrier frequency of the first test signal and the carrier frequency of the second test signal.

[0140] In the embodiment of the present invention, Fig.11 As shown, step 901 to step 903 specifically include:

[0141] S21: The signal generating device sends a first GPS radio frequency signal to the base station device to be tested based on the first reference clock frequency;

[0142] S22: The signal generating device sends a second GPS radio frequency signal to the base station device to be tested based on the second reference clock frequency;

[0143] S23: The base station device to be tested generates a first test signal based on the first GPS radio frequency signal;

[0144] S24: The base station device to be tested generates a second test signal based on the second GPS radio frequency signal;

[0145] S25: The signal analysis device demodulates the first test signal to obtain a carrier frequency of the first test signal;

[0146] S26: The signal analysis device demodulates the second test signal to obtain a carrier frequency of the second test signal;

[0147] S27: The signal analysis device determines whether the base station device to be tested has the capability of acquiring a reference clock from the GPS radio frequency signal according to the carrier frequency of the first test signal and the carrier frequency of the second test signal.

[0148] In an embodiment of the present invention, S17 or S27 specifically includes: a signal analysis device determines a ratio of a carrier frequency of a first test signal to a carrier frequency of a second test signal. When the ratio is equal to a preset threshold, it indicates that the base station device under test has the ability to obtain a reference clock from a GPS radio frequency signal.

[0149] In the embodiment of the present invention, S17 or S27 specifically includes: the ratio satisfies formula (1).

[0150] An embodiment of the present invention further provides a computer device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the above-mentioned method when executing the computer program.

[0151] An embodiment of the present invention further provides a computer-readable storage medium, wherein the computer-readable storage medium stores a computer program for executing the above method.

[0152] In summary, the communication base station equipment GPSDO test device and method provided by the present invention are simple, flexible, accurate in testing and easy to implement compared with the previous indirect measurement method. The related equipment of the device is easy to build, low in cost, flexible in use, and can fully meet the requirements of the test.

[0153] Those skilled in the art will appreciate that embodiments of the present invention may be provided as methods, systems, or computer program products. Therefore, the present invention may take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Moreover, the present invention may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0154] The present invention is described with reference to flowcharts and / or block diagrams of methods, devices (systems), and computer program products according to embodiments of the present invention. It should be understood that each process and / or block in the flowchart and / or block diagram, as well as the combination of processes and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0155] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0156] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 A step that specifies a function in one or more boxes.

[0157] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the embodiments of the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A communication base station equipment GPSDO test device, characterized in that: include: Signal generating device and signal analyzing device; The signal generating device is used to: convert the acquired baseband GPS data into GPS radio frequency signals, and transmit the GPS radio frequency signals to the base station device to be tested in the GPS frequency band; The signal analysis device is used to: demodulate the test signal to obtain the carrier frequency of the test signal, and determine whether the base station device to be tested has the performance of obtaining a reference clock from the GPS radio frequency signal according to the carrier frequency of the test signal; Wherein, the test signal is generated by the base station device to be tested based on the GPS radio frequency signal; The signal generating device is specifically used for: The baseband GPS data is sampled at a first signal sampling rate to obtain a first GPS radio frequency signal, and the first GPS radio frequency signal is transmitted to the base station device under test; the baseband GPS data is sampled at a second signal sampling rate to obtain a second GPS radio frequency signal, and the second GPS radio frequency signal is transmitted to the base station device under test; Or, using the first reference clock frequency as a reference, sending the first GPS radio frequency signal to the base station device under test; using the second reference clock frequency as a reference, sending the second GPS radio frequency signal to the base station device under test; The signal analysis device is used to: demodulate the first test signal to obtain the carrier frequency of the first test signal; demodulate the second test signal to obtain the carrier frequency of the second test signal; determine whether the base station device under test has the performance of obtaining a reference clock from a GPS radio frequency signal based on the carrier frequency of the first test signal and the carrier frequency of the second test signal; wherein the first test signal is generated by the base station device under test based on the first GPS radio frequency signal; and the second test signal is generated by the base station device under test based on the second GPS radio frequency signal.

2. The communication base station equipment GPSDO test device according to claim 1, characterized in that: The signal generating device is a software defined radio (SDR) board.

3. The communication base station equipment GPSDO test device as claimed in claim 2, characterized in that: Also includes: A PC, wherein the baseband GPS data is stored on the PC; The PC is used to send the baseband GPS data to the software radio SDR board card, and drive the software radio SDR board card to send out GPS radio frequency signals.

4. The communication base station equipment GPSDO test device as claimed in claim 2, characterized in that: Also includes: PC and storage; The memory is used to: store baseband GPS data; The PC is used to obtain baseband GPS data from the memory, send the baseband GPS data to the software radio SDR board card, and drive the software radio SDR board card to send out GPS radio frequency signals.

5. The communication base station equipment GPSDO test device as claimed in claim 2, characterized in that: Also includes: Mini-PC, wherein the Mini-PC is a circuit, board or module with SDR driving capability; The Mini-PC is used to send the baseband GPS data to the software radio SDR board card, and drive the software radio SDR board card to send out GPS radio frequency signals.

6. The communication base station equipment GPSDO test device as claimed in claim 2, characterized in that: Also includes: Mini-PC and memory; the Mini-PC is a circuit, board or module with SDR driving capability; The memory is used to: store baseband GPS data; The Mini-PC is used for: acquiring baseband GPS data from the memory, sending the baseband GPS data to the software radio SDR board card, and driving the software radio SDR board card to send out GPS radio frequency signals.

7. The communication base station equipment GPSDO test device according to claim 1, characterized in that: The signal generating device is a PC including a software defined radio (SDR) board, and the baseband GPS data is stored in the PC.

8. The communication base station equipment GPSDO test device according to claim 1, characterized in that: The signal generating device is a PC including a software defined radio (SDR) board; It also includes: a memory for storing the baseband GPS data.

9. The communication base station equipment GPSDO test device according to any one of claims 4, 6 or 8, characterized in that: The memory includes a USB flash drive, an SD card or a TF card.

10. The communication base station equipment GPSDO test device according to claim 1, characterized in that: The signal analysis device is specifically used for: The ratio of the carrier frequency of the first test signal to the carrier frequency of the second test signal is determined. When the ratio is equal to a preset threshold, it indicates that the base station device to be tested has the performance of obtaining a reference clock from the GPS radio frequency signal.

11. The communication base station equipment GPSDO test device according to claim 10, characterized in that: The ratio satisfies the following formula: Wherein, δ represents the value change rate between the first signal sampling rate and the second signal sampling rate, or the value change rate between the first reference clock frequency and the second reference clock frequency; f c2 represents the carrier frequency of the second test signal; f c1 Indicates the carrier frequency of the first test signal.

12. The communication base station equipment GPSDO testing device according to claim 1, characterized in that: Also includes: A signal source is used to provide a reference clock frequency for the signal generating device.

13. The communication base station equipment GPSDO testing device according to claim 1, characterized in that: The signal analysis device is a spectrum analyzer.

14. A communication base station equipment GPSDO testing method, characterized in that: include: The signal generating device converts the acquired baseband GPS data into GPS radio frequency signals, and transmits the GPS radio frequency signals to the base station device to be tested in the GPS frequency band; The base station device to be tested generates a test signal based on the GPS radio frequency signal; The signal analysis device demodulates the test signal to obtain the carrier frequency of the test signal, and determines whether the base station device to be tested has the performance of obtaining a reference clock from the GPS radio frequency signal according to the carrier frequency of the test signal; The signal generating device converts the acquired baseband GPS data into a GPS radio frequency signal, and transmits the GPS radio frequency signal to the base station device to be tested in the GPS frequency band, including: The baseband GPS data is sampled at a first signal sampling rate to obtain a first GPS radio frequency signal, and the first GPS radio frequency signal is transmitted to the base station device under test; the baseband GPS data is sampled at a second signal sampling rate to obtain a second GPS radio frequency signal, and the second GPS radio frequency signal is transmitted to the base station device under test; Or, using the first reference clock frequency as a reference, sending the first GPS radio frequency signal to the base station device under test; using the second reference clock frequency as a reference, sending the second GPS radio frequency signal to the base station device under test; The signal analysis device demodulates the test signal to obtain the carrier frequency of the test signal, and determines whether the base station device under test has the performance of obtaining a reference clock from a GPS radio frequency signal according to the carrier frequency of the test signal, including: the signal analysis device demodulates a first test signal to obtain the carrier frequency of the first test signal; demodulates a second test signal to obtain the carrier frequency of the second test signal; determines whether the base station device under test has the performance of obtaining a reference clock from a GPS radio frequency signal according to the carrier frequency of the first test signal and the carrier frequency of the second test signal; wherein the first test signal is generated by the base station device under test based on the first GPS radio frequency signal; and the second test signal is generated by the base station device under test based on the second GPS radio frequency signal.

15. A computer device comprising a memory, a processor and a computer program stored in the memory and executable on the processor, characterized in that: When the processor executes the computer program, the method of claim 14 is implemented.

16. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the method of claim 14 is implemented.

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