Method, module and device for measuring source difference of frequency signal

Abstract

The present invention discloses a method, module and device for measuring the source difference of a frequency signal. The method includes that after the frequency signal to be measured and a reference signal are mixed, a difference frequency signal of the frequency difference between the two signals is obtained and then input into a phase-locked loop, and the phase-locked loop performs phase locking on the difference frequency signal; the phase-locked loop provides a master clock based on the reference signal, and after the phase locking, an apparent frequency difference value is obtained, and then the corresponding apparent source difference is obtained through calculation, and the sum of the apparent source difference and the actual source difference of the reference signal is the actual source difference of the frequency signal to be measured obtained by measurement. The present invention can provide a general measurement means for signals in different frequency bands, and can ensure high accuracy of the source difference measurement result, and has the advantage of realizing low cost.

Description

Technical Field

[0001] The present invention belongs to the technical field of frequency signal measurement, and particularly relates to a method, module and device for measuring the source difference of frequency signals. Background Art

[0002] In the prior art, frequency signals include various types and different frequency bands. Attention needs to be paid to the generality, accuracy and low cost of the method for measuring the source difference of frequency signals, in order to provide a general measurement means that can meet different types and frequency bands, and can ensure the high accuracy of the measurement results, and the measurement means itself has the advantage of low cost implementation. Summary of the Invention

[0003] The main technical problem to be solved by the present invention is to provide a method, module and device for measuring the source difference of frequency signals, which solves the problem of general measurement of the source difference of different frequency signals in the prior art. It has the advantages of high measurement accuracy, modular composition and low cost.

[0004] To solve the above technical problem, a technical solution adopted by the present invention is to provide a method for measuring the source difference of frequency signals, including the steps of:

[0005] After the frequency signal to be measured and the reference signal are mixed, a difference frequency signal of the difference between the frequencies of the two signals is obtained, and then input into a phase-locked loop, and the phase-locked loop performs phase locking on the difference frequency signal; the phase-locked loop provides a master clock based on the reference signal, and after the phase-locked loop is phase-locked, an apparent frequency difference value is obtained, and then the corresponding apparent source difference is calculated, and the sum of the actual source difference of the reference signal is the actual source difference of the measured frequency signal obtained by measurement.

[0006] Preferably, after the frequency signal to be measured is frequency-multiplied or frequency-divided by a first factor, a first frequency-multiplied signal or a first frequency-divided signal is correspondingly obtained, and then mixed with the reference signal to obtain the difference frequency signal.

[0007] Preferably, after the reference signal is frequency-multiplied or frequency-divided by a second factor, a second frequency-multiplied signal or a second frequency-divided signal is correspondingly obtained, and then mixed with the frequency signal to be measured to obtain the difference frequency signal.

[0008] Preferably, after the frequency signal to be measured is frequency-multiplied by a first factor to obtain a first frequency-multiplied signal, and the reference signal is frequency-multiplied by a second factor to obtain a second frequency-multiplied signal, then the first frequency-multiplied signal and the second frequency-multiplied signal are mixed to obtain the difference frequency signal.

[0009] Preferably, after the reference signal is frequency-multiplied by a third factor to obtain a third frequency-multiplied signal, it is input into the phase-locked loop as the master clock.

[0010] Preferably, the nominal frequency value corresponding to the difference frequency signal is f0 - f1, where f0 is the nominal frequency value of the first frequency - doubled signal; f1 is the nominal frequency value of the second frequency - doubled signal, and the read value after the phase - locked loop is locked is The apparent frequency difference is:

[0011] Preferably, the apparent source difference is calculated and output from the apparent frequency difference The apparent source difference The calculation formula is:

[0012]

[0013] Preferably, the nominal frequency value f0 of the first frequency - doubled signal and the nominal frequency value f1 of the second frequency - doubled signal satisfy the relational expression:

[0014]

[0015] In the formula: is the difference of the measured frequency signal source, is the difference of the reference signal source;

[0016] From the calculation formula of the apparent source difference the is transformed to obtain:

[0017]

[0018] Further transform the relational expression of the nominal frequency value of the first frequency - doubled signal and the nominal frequency value of the second frequency - doubled signal to obtain:

[0019]

[0020] After expansion, ignoring the multiplication quantity the difference of the measured frequency signal source can be obtained:

[0021]

[0022] Based on the same inventive concept, the present invention further provides a source difference measurement module for frequency signals, including a first frequency multiplier, a second frequency multiplier, a third frequency multiplier, a mixer, a phase-locked loop, and a data processing unit. The first frequency multiplier inputs the frequency signal to be measured, and outputs a first multiplied frequency signal to the mixer after the first frequency multiplication. The second frequency multiplier inputs a reference signal, and outputs a second multiplied frequency signal to the mixer after the second frequency multiplication. The mixer outputs a difference frequency signal after subtracting the first multiplied frequency signal and the second multiplied frequency signal. The third frequency multiplier inputs the reference signal, and obtains a third multiplied frequency signal after the third frequency multiplication, which is input to the phase-locked loop as the main clock. The difference frequency signal is input to the phase-locked loop. After phase locking, an apparent frequency difference value is obtained and input to the data processing unit, and the corresponding apparent source difference is further calculated. The sum of the apparent source difference and the actual source difference of the reference signal generates and outputs the actual source difference of the frequency signal to be measured.

[0023] Based on the same inventive concept, the present invention further provides a frequency signal measurement device, including a memory and a processor coupled to each other. The memory is used to store a computer program. The processor is used to read and execute the computer program stored in the memory. When the computer program is executed, the processor executes the method according to any one of claims 1-8.

[0024] The beneficial effects of the present invention are as follows: The present invention discloses a method, module, and device for measuring the source difference of frequency signals, which can provide a general measurement means suitable for different types and frequency bands, and can ensure high accuracy of the measurement results, and has the advantage of low cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 is a flowchart of an embodiment of the method for measuring the source difference of the frequency signal of the present invention;

[0026] Figure 2 is a schematic diagram of the composition of an embodiment of the source difference measurement module for frequency signals of the present invention;

[0027] Figure 3 is a schematic diagram of the composition of an embodiment of the frequency signal measurement device of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0028] For the convenience of understanding the present invention, the present invention will be described in more detail below with reference to the drawings and specific embodiments. The preferred embodiments of the present invention are shown in the drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described in this specification. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosure content of the present invention more thorough and comprehensive.

[0029] It should be noted that, unless otherwise defined, all technical and scientific terms used in this specification have the same meaning as commonly understood by those skilled in the technical field to which the present invention belongs. The terms used in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0030] The present invention discloses a method, module and device for measuring the source difference of frequency signals, which can provide a general measurement means suitable for different types and frequency bands, and can ensure the high accuracy of the measurement results, and has the advantage of realizing low cost.

[0031] The following will describe each embodiment in detail with reference to the accompanying drawings.

[0032] Figure 1 is a method for measuring the source difference of frequency signals, which consists of Figure 1 It can be seen that the method for measuring the source difference of frequency signals includes:

[0033] Step S1: After the measured frequency signal and the reference signal are mixed, a difference frequency signal of the difference between the frequencies of the two signals is obtained, and then input into a phase-locked loop, and the phase-locked loop performs phase locking on the difference frequency signal.

[0034] Step S2: The phase-locked loop provides a master clock based on the reference signal. After the phase-locked loop is phase-locked, an apparent frequency difference value is obtained, and then the corresponding apparent source difference is calculated. The sum of the apparent source difference and the actual source difference of the reference signal is the actual source difference of the measured frequency signal obtained by measurement.

[0035] Preferably, in order to adapt to measured frequency signals of different frequency bands, before the measured frequency signal and the reference signal are mixed, the measured frequency signal and the reference signal can be frequency-transformed separately or simultaneously, including frequency doubling or frequency division respectively. The purpose is to make the frequency difference range obtained after mixing exactly fall within the input frequency range of the phase-locked loop. Thus, according to the measured frequency signals of different frequency bands, frequency transform can be performed by adding frequency doublers or frequency dividers correspondingly, and these frequency doublers or frequency dividers can be made in a modular manner and can be flexibly replaced as needed, which not only expands the frequency range of the measured frequency signals, but also makes the method of the present invention universal.

[0036] Preferably, since the amplitudes of the measured frequency signals can have different ranges, before entering the mixing, the measured frequency signal can also be subjected to amplitude limiting or amplification processing first, and can also be subjected to filtering and shaping processing to eliminate the interference components therein and keep the amplitude of the measured frequency signal controlled within a stable range.

[0037] Preferably, the measured frequency signal is frequency - doubled for the first time to obtain a first frequency - doubled signal, and then the first frequency - doubled signal and the reference signal are mixed to obtain the difference - frequency signal.

[0038] Preferably, the measured frequency signal is frequency - doubled or frequency - divided for the first time to correspondingly obtain a first frequency - doubled signal or a first frequency - divided signal, and then it is mixed with the reference signal to obtain the difference - frequency signal.

[0039] Preferably, the reference signal is frequency - doubled for the second time to obtain a second frequency - doubled signal, and then the measured frequency signal and the second frequency - doubled signal are mixed to obtain the difference - frequency signal.

[0040] Preferably, the reference signal is frequency - doubled or frequency - divided for the second time to correspondingly obtain a second frequency - doubled signal or a second frequency - divided signal, and then it is mixed with the measured frequency signal to obtain the difference - frequency signal.

[0041] Preferably, the measured frequency signal is frequency - doubled for the first time to obtain a first frequency - doubled signal, the reference signal is frequency - doubled for the second time to obtain a second frequency - doubled signal, and then the first frequency - doubled signal and the second frequency - doubled signal are mixed to obtain the difference - frequency signal.

[0042] Preferably, the measured frequency signal is frequency - doubled for the first time to obtain a first frequency - doubled signal, the reference signal is frequency - doubled for the second time to obtain a second frequency - doubled signal, and then the first frequency - doubled signal and the second frequency - doubled signal are mixed to obtain the difference - frequency signal; or, the measured frequency signal is frequency - divided for the first time to obtain a first frequency - divided signal, the reference signal is frequency - divided for the second time to obtain a second frequency - divided signal, and then the first frequency - divided signal and the second frequency - divided signal are mixed to obtain the difference - frequency signal.

[0043] Preferably, the reference signal is also input as the main clock into the phase - locked loop. Preferably, the reference signal is frequency - tripled or frequency - divided for the third time to correspondingly obtain a third frequency - tripled signal or a third frequency - divided signal, which is input as the main clock into the phase - locked loop.

[0044] The above frequency - division and frequency - doubling processes are mainly to meet the requirements of various application scenarios. For example, when mixing has specific frequency range requirements for the two signals to be mixed, but the measured frequency signal and the reference signal may not necessarily meet these frequency range requirements. Therefore, it is necessary to perform frequency - doubling or frequency - division processing on the measured frequency signal and the reference signal so that the processed signals can meet the frequency range of the input signals for mixing. Similarly, since the phase - locked loop is implemented by digital circuits, it also requires a clock to drive it. It can either directly use the reference signal as the main clock input, or use the reference signal after frequency - doubling or frequency - division as the main clock input into the phase - locked circuit.

[0045] It can be seen that the master clock of the phase-locked loop also comes from the reference signal. Therefore, the source difference of the phase-locked loop is also affected by the source difference of the master clock. Preferably, after the measured frequency signal and the reference signal are both frequency-multiplied and then mixed, the nominal frequency value corresponding to the difference frequency signal is f0 - f1, where f0 is the nominal frequency value of the first frequency-multiplied signal; f1 is the nominal frequency value of the second frequency-multiplied signal, and the reading value after the phase-locked loop is locked is The apparent frequency difference value is: Note that the reading value after the phase-locked loop is locked is also affected by the source difference of the reference signal, obtained through the phase increment per unit time of the phase-locked loop, which represents the locked frequency corresponding to the phase-locked loop after locking the input difference frequency signal. Obviously, due to the existence of the source difference, this locked frequency is not equal to the nominal frequency value f0 - f1 corresponding to the difference frequency signal. The corresponding apparent frequency difference value can be calculated as: Therefore, the phase-locked loop can be based on the read and the known nominal frequency value f0 - f1 to calculate and output the apparent frequency difference value

[0046] For example, the nominal frequency value f of the reference signal s is 10 MHz, the nominal frequency value f1 of the second frequency-multiplied signal after frequency multiplication is 1800 MHz, and the common measured frequency signal f u and the nominal frequency value f0 of the first frequency-multiplied signal obtained by the first frequency multiplication are shown in Table 1.

[0047] Table 1 Common measured frequency signals, the first frequency multiplication, and the nominal value f0 of the first frequency-multiplied signal

[0048]

[0049]

[0050] Preferably, the apparent source difference value is calculated and output from the apparent frequency difference value The apparent source difference value The calculation formula is:

[0051]

[0052] Preferably, when the phase-locked loop is locked, the actual value of the input difference frequency signal is f0' - f1', where f0' is the actual frequency value of the first frequency-multiplied signal and f1' is the actual frequency value of the second frequency-multiplied signal, and the actual value of the frequency locked by the phase-locked loop is Obviously, the two actual frequencies are equal after locking, that is: Also, since the phase-locked loop uses the reference signal as the main clock and the second frequency-doubled signal is obtained by frequency-doubling the reference signal, both are related to the reference signal. Therefore, the nominal frequency value of the first frequency-doubled signal and the nominal frequency value of the second frequency-doubled signal satisfy the relational expression:

[0053]

[0054] In the formula: is the source error of the frequency signal to be measured, is the source error of the reference signal;

[0055] From the calculation formula of the apparent source error value it is deformed to obtain: Deformed to obtain:

[0056]

[0057] Further transform the relational expression of the nominal value of the first frequency-doubled signal and the nominal value of the second frequency-doubled signal to obtain:

[0058]

[0059] Since and are both numbers of an order less than 10 -6 the multiplication quantity between them is a high-order quantity and can be ignored. Ignoring the multiplication quantity in the formula, we can obtain:

[0060]

[0061] Therefore, when the source error of the reference signal is known and the apparent source error value can be calculated by the method of the present application, then the source error of the frequency signal to be measured can be calculated. Then, from the nominal frequency value f u of the frequency signal to be measured, the actual frequency value

[0062] of the frequency signal to be measured can be calculated. In actual applications, for the reference signal, a high-precision atomic clock can be used, or a high-precision frequency reference signal can be obtained through satellite time service. Accordingly, the corresponding source error accuracy can be of the order of 10 -12 Therefore, the corresponding source error and frequency accuracy of the frequency signal to be measured that can be measured are of the order of 10 -12 order.

[0063] Based on the same inventive concept, such as Figure 2As shown in the figure, the present invention further includes a source difference measurement module 10 for frequency signals, which includes a first frequency multiplier 100, a second frequency multiplier 101, a third frequency multiplier 102, a mixer 103, a phase-locked loop 104, and a data processing unit 105. The first frequency multiplier 100 inputs the frequency signal to be measured, and outputs a first multiplied frequency signal to the mixer 103 after the first multiplication. The second frequency multiplier 101 inputs a reference signal, and outputs a second multiplied frequency signal to the mixer 103 after the second multiplication. The mixer 103 outputs a difference frequency signal after subtracting the first multiplied frequency signal and the second multiplied frequency signal. The third frequency multiplier 102 inputs the reference signal, and obtains a third multiplied frequency signal after the third multiplication, which is input to the phase-locked loop 104 as the main clock. The difference frequency signal is input to the phase-locked loop 104. After phase locking, an apparent frequency difference value is obtained and input to the data processing unit 105. The corresponding apparent source difference is further calculated, and the sum of the apparent source difference and the actual source difference of the reference signal is used to generate and output the actual source difference of the frequency signal to be measured.

[0064] For the functions and effects of each component unit of the source difference measurement module specifically, reference can be made to the foregoing content, which will not be elaborated here.

[0065] Based on the same inventive concept, as Figure 3 shown in the figure, the present invention further includes a frequency signal measurement device 20, which includes a memory 201 and a processor 202 that are mutually coupled. The memory 201 is used to store a computer program. The processor 202 is used to read and execute the computer program stored in the memory 201. When the computer program is executed, the processor 202 executes the measurement method described above. Preferably, the functions of each component unit in Figure 2 are implemented in the processor 202 in the form of software or programmable hardware.

[0066] The memory 201 in the embodiments of the present application may be a volatile memory or a non-volatile memory, or may include both volatile and non-volatile memories 201. Among them, the non-volatile memory may be a read-only memory (ROM), a programmable read-only memory (PROM), an erasable programmable read-only memory (EPROM), an electrically erasable programmable read-only memory (EEPROM), or a flash memory. The volatile memory may be a random access memory (RAM), which is used as an external cache. By way of example but not limitation, many forms of RAM are available, such as static random access memory (SRAM), dynamic random access memory (DRAM), synchronous dynamic random access memory (SDRAM), double data rate synchronous dynamic random access memory (DDR SDRAM), enhanced synchronous dynamic random access memory (ESDRAM), synchlink dynamic random access memory (SLDRAM), and direct rambus random access memory (DR RAM). It should be noted that the memory 201 of the systems and methods described herein is intended to include, but is not limited to, these and any other suitable types of memory 201.

[0067] The processor 202 in the embodiments of the present application may be an integrated circuit chip with the ability to process signals. In the implementation process, the steps of the above method embodiments may be completed by the integrated logic circuit in the hardware of the processor 202 or by instructions in the form of software. The processor 202 may be a general-purpose processor, a DSP, an ASIC, an FPGA, or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components. The general-purpose processor may be a microprocessor or the processor may also be any conventional processor, etc. The steps of the method disclosed in the embodiments of the present application may be directly embodied as being executed and completed by the hardware-encoded processor, or may be executed and completed by a combination of the hardware and software modules in the encoded processor. The software module may be located in a mature storage medium in the art, such as a random access memory, a flash memory, a read-only memory, a programmable read-only memory, or an electrically erasable programmable memory, a register, etc. This storage medium is located in the memory, and the processor reads the information in the memory and combines its hardware to complete the steps of the above method.

[0068] Those of ordinary skill in the art can realize that the units and algorithm steps of each example described in combination with the embodiments disclosed herein can be implemented by electronic hardware, or a combination of computer software and electronic hardware, depending on the specific application and design constraints of the technical solution. Professional technicians can use different methods for each specific application to implement the described functions, but such implementation should not be considered to exceed the scope of this application.

[0069] The device embodiments described above in this application are merely illustrative. For example, the division of the units is only a logical function division, and there may be other division methods in actual implementation. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the displayed or discussed coupling or direct coupling or communication connection between each other can be through some interfaces, and the indirect coupling or communication connection of the device or unit can be in electrical, mechanical or other forms.

[0070] The units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they can be located in one place, or can be distributed to multiple network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the embodiments of this application.

[0071] In addition, the functional units in each embodiment of this application can be integrated in a processing unit, or each unit can exist physically alone, or two or more units can be integrated in one unit.

[0072] If the function is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on such an understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, or a part of this technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to enable a computer device (which can be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the methods described in each embodiment of this application.

[0073] The above are only the embodiments of the present invention, and do not limit the patent scope of the present invention. Any equivalent structural transformation made by using the specification and drawings of the present invention, or directly or indirectly applied in other related technical fields, is included in the patent protection scope of the present invention.

Claims

1. A method for measuring the source difference of a frequency signal, characterized in that, after the frequency signal to be measured and the reference signal are mixed, a difference frequency signal of the difference between the frequencies of these two signals is obtained, and then it is input into a phase-locked loop, and the phase-locked loop locks the phase of the difference frequency signal; the phase-locked loop provides a master clock based on the reference signal, after the phase-locked loop locks the phase, an apparent frequency difference value is obtained, and then the corresponding apparent source difference is obtained through calculation, and the sum of it and the actual source difference of the reference signal is the actual source difference of the frequency signal to be measured obtained by measurement; Among them, the nominal frequency value corresponding to the difference frequency signal is , is the nominal frequency value of the first frequency multiplication signal; is the nominal frequency value of the second frequency multiplication signal, and the read value after the phase-locked loop is locked is , and the apparent frequency difference value is: ; Calculate and output the apparent source difference from the apparent video difference : ； The nominal frequency value of the first frequency-doubled signal and the nominal frequency value of the second frequency-doubled signal satisfy the relationship: ， In the formula: is the difference of the frequency signal source to be measured, is the difference of the reference signal source; Derived from the apparent source difference by transformation: ， further transform the relational expression of the nominal frequency value of the first frequency-multiplied signal and the nominal frequency value of the second frequency-multiplied signal to obtain: ， After expansion, ignore the multiplication quantity , the actual source difference of the measured frequency signal can be obtained: 。 2. The source difference measurement method of the frequency signal according to claim 1, wherein, after the frequency signal to be measured is frequency-multiplied by the first time or divided by the first time, a first frequency-multiplied signal or a first divided signal is correspondingly obtained, and then after being mixed with the reference signal, the difference frequency signal is obtained.

3. The source difference measurement method of the frequency signal according to claim 1, characterized in that after the reference signal is frequency-multiplied by the second time or divided by the second time, a second frequency-multiplied signal or a second divided signal is correspondingly obtained, and then after being mixed with the frequency signal to be measured, the difference frequency signal is obtained.

4. The source difference measurement method of the frequency signal according to claim 1, wherein after the frequency signal to be measured is frequency-multiplied by the first time, a first frequency-multiplied signal is obtained, after the reference signal is frequency-multiplied by the second time, a second frequency-multiplied signal is obtained, and then after the first frequency-multiplied signal and the second frequency-multiplied signal are mixed, the difference frequency signal is obtained.

5. The source difference measurement method of the frequency signal according to claim 4, characterized in that after the reference signal is frequency-multiplied by the third time, a third frequency-multiplied signal is obtained and input into the phase-locked loop as the master clock.

6. A source difference measurement module for a frequency signal, characterized in that, It includes a first frequency multiplier, a second frequency multiplier, a third frequency multiplier, a mixer, a phase-locked loop and a data processing unit. The first frequency multiplier inputs the frequency signal to be measured, outputs a first frequency-multiplied signal to the mixer after being frequency-multiplied by the first time, the second frequency multiplier inputs the reference signal, outputs a second frequency-multiplied signal to the mixer after being frequency-multiplied by the second time, the mixer outputs the difference frequency signal after mixing the first frequency-multiplied signal and the second frequency-multiplied signal, the third frequency multiplier inputs the reference signal, obtains a third frequency-multiplied signal after being frequency-multiplied by the third time, inputs it into the phase-locked loop as the master clock, the difference frequency signal is input into the phase-locked loop, after the phase is locked, an apparent frequency difference value is obtained and input into the data processing unit, and the corresponding apparent source difference is further calculated, and the sum of it and the actual source difference of the reference signal generates and outputs the actual source difference of the frequency signal to be measured; Among them, the nominal frequency value corresponding to the difference frequency signal is , is the nominal frequency value of the first frequency multiplication signal; is the nominal frequency value of the second frequency multiplication signal, and the read value after the phase-locked loop is locked is , and the apparent frequency difference value is: ; Calculate and output the apparent source difference from the apparent video difference : ； The nominal frequency value of the first frequency-doubled signal and the nominal frequency value of the second frequency-doubled signal satisfy the relationship: ， Wherein: is the difference of the frequency signal source to be measured, is the difference of the reference signal source; from the apparent source difference derived by transformation: ， further transform the relational expression of the nominal frequency value of the first frequency-multiplied signal and the nominal frequency value of the second frequency-multiplied signal to obtain: ， After expansion, ignore the multiplication quantity , the actual source difference of the measured frequency signal can be obtained: 。 7. A frequency signal measuring device, characterized in that, It includes a memory and a processor that are mutually coupled, the memory is used to store computer programs; the processor is used to read and execute the computer programs stored in the memory, and when the computer programs are executed, the processor executes the method according to any one of claims 1-5.

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