A method, system, device and medium for calculating eLoran signal field strength

Abstract

This invention belongs to the field of radio communication technology, specifically relating to a method, system, device, and medium for calculating eLoran signal field strength. The method includes acquiring the eLoran signal, antenna factor, and feeder loss parameters; linearly averaging the eLoran signal to obtain the peak values ​​of each peak before 37.5 μs; calculating the signal envelope amplitude at 25 μs based on the peak values ​​of each peak before 37.5 μs, a preset amplitude ratio, and preset weights; and calculating the signal field strength based on the signal envelope amplitude at 25 μs, the antenna factor, and the feeder loss parameters. By using each peak of the eLoran signal and its corresponding ratio to calculate the signal envelope amplitude at 25 μs, this method can reduce interference and improve the accuracy of the calculation if the peak value of a certain peak is affected by interference.

Description

Technical Field

[0001] This invention belongs to the field of radio communication technology, specifically relating to an eLoran signal field strength calculation method, system, device, and medium. Background Technology

[0002] In eLoran (Enhanced Long Range Navigation) timing systems, eLoran signal strength is a crucial parameter. It effectively characterizes the transmission power of the eLoran signal, providing vital support for determining the coverage area and studying radio wave propagation characteristics. Therefore, the accuracy and effectiveness of eLoran signal strength measurement are of great significance for ensuring the security and reliability of my country's timekeeping system. The eLoran signal strength calculation method is a critical step in eLoran signal strength measurement. This process requires accurately calculating the envelope amplitude of the eLoran signal at 25 μs, and then calculating the eLoran signal strength based on this amplitude, antenna factor, and feeder parameters. The location and method used to calculate the envelope amplitude at 25 μs significantly impact the accuracy of subsequent eLoran signal strength values; therefore, advanced eLoran signal strength calculation techniques are indispensable.

[0003] Currently, there is little literature discussing methods for measuring the field strength of eLoran signals. Because eLoran signals use the Loran pulse system, there are no dedicated, precise field strength meters available on the market. Generally, eLoran receivers manufactured by equipment companies are used to process and output the signal level, and the signal field strength is calculated by measuring the signal level. However, the primary purpose of the receiver is accurate decoding, and the methods employed revolve around this decoding process. For example, adaptive gain is used in the front-end eLoran signal processing, and hard limiting is used in subsequent decoding. This significantly affects the amplitude of the eLoran signal itself, resulting in inaccurate measurements of the eLoran signal field strength. Summary of the Invention

[0004] The purpose of this invention is to provide a method, system, device and medium for calculating eLoran signal field strength, so as to solve the technical problem of low accuracy in calculating eLoran signal field strength values ​​in the prior art.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] In a first aspect, the present invention provides a method for calculating the field strength of an eLoran signal, comprising:

[0007] Obtain the eLoran signal, antenna factor, and feeder loss parameters, and linearly average the eLoran signal to obtain the peak values ​​of each peak before 37.5 μs in the eLoran signal;

[0008] Based on the peak values ​​of each peak before 37.5 μs, the preset amplitude ratio, and the preset weight, calculate the signal envelope amplitude at 25 μs.

[0009] The signal field strength was calculated based on the signal envelope amplitude at 25 μs and the obtained antenna factor and feeder loss parameters.

[0010] Preferably, the eLoran signal is linearly averaged according to GRI (Group Repetition Interval).

[0011] Preferably, the preset amplitude ratio is the absolute value BR(t) of the ratio of the peak value of each peak before 37.5μs to the amplitude of the signal envelope at 25μs, specifically:

[0012]

[0013] In the formula, BR(t) represents the absolute value of the ratio of the peak value of each peak before 37.5μs to the amplitude of the signal envelope at 25μs; This represents the absolute value of the signal envelope amplitude at 25 μs; This represents the absolute value of the signal envelope amplitude at time t; This indicates the time from the start of the signal to this point. Here, the time corresponding to the peak value of the signal is taken, for example, 12.5, 22.5, 32.5, etc.

[0014] Preferably, the peak values ​​of each peak before 37.5 μs include: the third positive peak value A3, the second positive peak value A2, the first positive peak value A1, the fourth negative peak value B4, the third negative peak value B3, the second negative peak value B2, and the first negative peak value B1; the preset weights are specifically determined according to the output signal characteristics obtained by the signal processing method, specifically: if the signal amplitude is larger and more accurate, then the weights of A3 and B4 are set to 0.3~0.4, the weights of A2 and B3 are set to 0.1~0.2, the weights of A1, B1, and B2 are set to 0~0.1, and the sum of the weights of A1, A2, A3, B1, B2, B3, and B4 is 1;

[0015] If a smaller signal amplitude results in greater precision, then the weights of A3 and B4 are set to 0~0.1, the weights of A2 and B3 are set to 0.1~0.2, the weights of A1, B1, and B2 are set to 0.3~0.4, and the sum of the weights of A1, A2, A3, B1, B2, B3, and B4 is 1.

[0016] Preferably, the step of calculating the signal envelope amplitude at 25μs based on the peak values ​​of each peak before 37.5μs, a preset amplitude ratio, and a preset weight, specifically uses the following formula:

[0017]

[0018] In the formula, AM represents the signal envelope amplitude at 25μs, WEi represents the weight corresponding to the peak value at the i-th position, Ai represents the peak value corresponding to the positive peak in the i-th week, POi represents the ratio of the signal envelope amplitude at 25μs to the peak value of the positive peak in the i-th week, Bi represents the peak value corresponding to the negative peak in the i-th week, and NEi represents the ratio of the signal envelope amplitude at 25μs to the peak value of the negative peak in the i-th week.

[0019] Preferably, the step of calculating the signal field strength based on the signal envelope amplitude at 25 μs and the obtained antenna factor and feeder loss parameters specifically involves:

[0020] Signal field strength = signal envelope amplitude at 25μs - antenna factor + feeder loss parameter.

[0021] In a second aspect, the present invention provides an eLoran signal field strength calculation system, comprising:

[0022] The acquisition unit is used to acquire the eLoran signal, antenna factor and feeder loss parameters, and linearly average the eLoran signal to obtain the peak values ​​of each peak before 37.5μs in the eLoran signal.

[0023] The first calculation unit is used to calculate the signal envelope amplitude at 25μs based on the peak values ​​of each peak before 37.5μs, the preset amplitude ratio relationship, and the preset weight.

[0024] The second calculation unit is used to calculate the signal field strength based on the signal envelope amplitude at 25μs and the obtained antenna factor and feeder loss parameters.

[0025] Preferably, in the first calculation unit, the signal envelope amplitude at 25μs is calculated using the following formula:

[0026]

[0027] In the formula, AM represents the signal envelope amplitude at 25μs, WEi represents the weight corresponding to the peak value at the i-th position, Ai represents the peak value corresponding to the positive peak in the i-th week, POi represents the ratio of the signal envelope amplitude at 25μs to the peak value of the positive peak in the i-th week, Bi represents the peak value corresponding to the negative peak in the i-th week, and NEi represents the ratio of the signal envelope amplitude at 25μs to the peak value of the negative peak in the i-th week.

[0028] In a third aspect, the present invention provides an electronic device including a processor and a memory, the processor being configured to execute a computer program stored in the memory to implement the eLoran signal field strength calculation method described in any of the preceding claims.

[0029] In a fourth aspect, the present invention provides a computer-readable storage medium, characterized in that the computer-readable storage medium stores at least one instruction, which, when executed by a processor, implements the eLoran signal field strength calculation method described in any one of the preceding claims.

[0030] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0031] This invention uses the peaks of the eLoran signal and their corresponding proportional relationships to calculate the signal envelope amplitude at 25 μs. If the peak value of a certain peak is affected by interference, this method can reduce such influence and improve the accuracy of the calculation. Using weights to calculate the signal envelope amplitude at 25 μs allows full utilization of signal characteristics and signal processing methods to improve calculation accuracy. For example, skywave interference in the eLoran signal occurs in the 37.5-1500 μs range, so the weight of the signal peak value after 37.5 μs can be adjusted to 0 to avoid skywave interference. Attached Figure Description

[0032] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0033] Figure 1 This is a schematic diagram of the method steps in an embodiment of the present invention;

[0034] Figure 2 This is a flowchart illustrating the eLoran signal field strength calculation process according to an embodiment of the present invention.

[0035] Figure 3 This is a peak position identification diagram according to an embodiment of the present invention;

[0036] Figure 4 This is a system block diagram of an embodiment of the present invention;

[0037] Figure 5 This is a structural block diagram of an electronic device according to an embodiment of the present invention. Detailed Implementation

[0038] The present invention will now be described in detail with reference to the accompanying drawings and embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other.

[0039] The following detailed description is exemplary and intended to provide further detailed explanation of the invention. Unless otherwise specified, all technical terms used in this invention have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains. The terminology used in this invention is for the purpose of describing particular embodiments only and is not intended to limit the scope of exemplary embodiments according to the invention.

[0040] See Figure 1 This application discloses a method for calculating the field strength of an eLoran signal, including:

[0041] S1: Obtain the eLoran signal, antenna factor and feeder loss parameters, and linearly average the eLoran signal to obtain the peak values ​​of each peak before 37.5μs in the eLoran signal;

[0042] S2: Calculate the signal envelope amplitude at 25μs based on the peak values ​​of each peak before 37.5μs, the preset amplitude ratio, and the preset weights;

[0043] S3: The signal strength is calculated based on the signal envelope amplitude at 25μs and the obtained antenna factor and feeder loss parameters. The signal envelope amplitude at 25μs is calculated using the peaks of the eLoran signal and their corresponding proportional relationships. If the peak value of a certain peak is affected by interference, this method can reduce such influence and improve the accuracy of the calculation. Weighting is used to calculate the signal envelope amplitude at 25μs, which fully utilizes the characteristics of the signal and the signal processing method to improve the accuracy of the calculation. For example, skywave interference in the eLoran signal occurs in the 37.5-1500μs range, so the weight of the signal peak value after 37.5μs can be adjusted to 0 to avoid skywave interference.

[0044] In some embodiments, the eLoran signal is linearly averaged according to GRI (Group Repetition Interval).

[0045] In some embodiments, since sky waves typically reappear 37.5-1500 μs after ground waves, data from 37.5 μs prior is used for calculations to eliminate the influence of sky waves. The preset amplitude ratio is the absolute value BR(t) of the ratio of the peak value of each peak before 37.5 μs to the signal envelope amplitude at 25 μs, specifically:

[0046]

[0047] In the formula, BR(t) represents the absolute value of the ratio of the peak value of each peak before 37.5μs to the amplitude of the signal envelope at 25μs; This represents the absolute value of the signal envelope amplitude at 25 μs; This represents the absolute value of the signal envelope amplitude at time t; This indicates the time from the start of the signal to this point. Here, the time corresponding to the peak value of the signal is taken, for example, 12.5, 22.5, 32.5, etc.

[0048] In some embodiments, the peak values ​​of each peak before 37.5 μs include: a third positive peak value A3, a second positive peak value A2, a first positive peak value A1, a fourth negative peak value B4, a third negative peak value B3, a second negative peak value B2, and a first negative peak value B1; the preset weights are specifically determined based on the output signal characteristics obtained by the signal processing method, specifically: if the signal amplitude is larger and more accurate, then the weights of A3 and B4 are set to 0.3~0.4, the weights of A2 and B3 are set to 0.1~0.2, the weights of A1, B1, and B2 are set to 0~0.1, and the sum of the weights of A1, A2, A3, B1, B2, B3, and B4 is 1;

[0049] If a smaller signal amplitude results in greater precision, then the weights of A3 and B4 are set to 0~0.1, the weights of A2 and B3 are set to 0.1~0.2, the weights of A1, B1, and B2 are set to 0.3~0.4, and the sum of the weights of A1, A2, A3, B1, B2, B3, and B4 is 1.

[0050] Preferably, the step of calculating the signal envelope amplitude at 25μs based on the peak values ​​of each peak before 37.5μs, a preset amplitude ratio, and a preset weight, specifically uses the following formula:

[0051]

[0052] In the formula, AM represents the signal envelope amplitude at 25μs, WEi represents the weight corresponding to the peak value at the i-th position, Ai represents the peak value corresponding to the positive peak in the i-th week, POi represents the ratio of the signal envelope amplitude at 25μs to the peak value of the positive peak in the i-th week, Bi represents the peak value corresponding to the negative peak in the i-th week, and NEi represents the ratio of the signal envelope amplitude at 25μs to the peak value of the negative peak in the i-th week.

[0053] In some embodiments, the calculation of the signal field strength based on the signal envelope amplitude at 25 μs and the obtained antenna factor and feeder loss parameters specifically involves:

[0054] Signal field strength = signal envelope amplitude at 25μs - antenna factor + feeder loss parameter.

[0055] In some embodiments, the present invention indirectly derives the field strength of the eLoran signal by calculating the envelope amplitude of the eLoran signal at 25 μs. The specific signal field strength calculation process is as follows: Figure 2 As shown.

[0056] First, the received eLoran signal is linearly averaged according to GRI. Since the values ​​corresponding to each peak in the signal have a fixed proportional relationship with the amplitude of the signal envelope at 25 μs, the amplitude corresponding to that point's envelope is calculated using the values ​​of each peak. Let the time corresponding to a certain peak be t, and the absolute value of the ratio of the peak value of that peak to the amplitude of the signal envelope at 25 μs be BR(t), then we have:

[0057] (1)

[0058] Based on the above calculation formula, the ratio of the peak value of each peak to the signal envelope amplitude at 25 μs can be obtained. Since sky waves typically reappear 37.5-1500 μs after ground waves, to eliminate the influence of sky waves, data before 37.5 μs is used for calculation. The table below shows the ratio of the peak value of each peak before 37.5 μs to the signal envelope amplitude at 25 μs.

[0059] Table 1. Ratios of each peak amplitude to the signal envelope amplitude at 25 μs.

[0060]

[0061] Where AM represents the signal envelope amplitude at 25μs, A1, A2, A3, and A4 represent the positive peak values ​​corresponding to each cycle from the start of the signal, and B1, B2, B3, and B4 represent the negative peak values ​​corresponding to each cycle from the start of the signal. A detailed diagram is shown below. Figure 3 As shown, PO1, PO2, PO3, PO4 and NE1, NE2, NE3, NE4 represent the ratios in parentheses.

[0062] Due to the characteristics of signal processing algorithms, the accuracy of signal amplitude corresponding to different peaks may vary. Therefore, when calculating the signal envelope amplitude at 25μs, the peak with the more accurate amplitude should be selected and given a higher weight. For example, when the front-end signal processing method is wavelet hard thresholding, the larger the signal amplitude, the lower the probability of distortion after hard thresholding. Therefore, when calculating the signal envelope amplitude at 25μs, the peak with the larger amplitude should be given a higher weight. The specific calculation formula is shown below:

[0063] (2)

[0064] Where WEi represents the weight corresponding to the peak value at the i-th position, Ai represents the peak value corresponding to the positive peak at the i-th week, POi represents the ratio of the signal envelope amplitude at 25μs to the peak value of the positive peak at the i-th week, Bi represents the peak value corresponding to the negative peak at the i-th week, and NEi represents the ratio of the signal envelope amplitude at 25μs to the peak value of the negative peak at the i-th week.

[0065] After calculating the signal envelope amplitude at 25μs using the above formula, the field strength value of the eLoran signal can be indirectly calculated using the following formula.

[0066] Signal field strength = signal envelope amplitude at 25μs - antenna factor + feeder loss parameter.

[0067] This invention uses the peak value and ratio relationship of each peak of the eLoran signal to indirectly calculate the signal envelope amplitude at 25μs. Each peak has a corresponding weight, and the weight allocation is adjusted according to signal processing and eLoran signal characteristics. After calculating the signal envelope amplitude at 25μs relatively accurately, the actual signal field strength at that point is calculated based on parameters such as antenna factor and feed line.

[0068] This application also discloses an eLoran signal field strength calculation system, see [link to relevant documentation]. Figure 4 ,include:

[0069] The acquisition unit is used to acquire the eLoran signal, antenna factor and feeder loss parameters, and linearly average the eLoran signal to obtain the peak values ​​of each peak before 37.5μs in the eLoran signal.

[0070] The first calculation unit is used to calculate the signal envelope amplitude at 25μs based on the peak values ​​of each peak before 37.5μs, the preset amplitude ratio relationship, and the preset weight.

[0071] The second calculation unit is used to calculate the signal field strength based on the signal envelope amplitude at 25μs and the obtained antenna factor and feeder loss parameters.

[0072] In some embodiments, the first calculation unit calculates the signal envelope amplitude at 25 μs using the following formula:

[0073]

[0074] In the formula, AM represents the signal envelope amplitude at 25μs, WEi represents the weight corresponding to the peak value at the i-th position, Ai represents the peak value corresponding to the positive peak in the i-th week, POi represents the ratio of the signal envelope amplitude at 25μs to the peak value of the positive peak in the i-th week, Bi represents the peak value corresponding to the negative peak in the i-th week, and NEi represents the ratio of the signal envelope amplitude at 25μs to the peak value of the negative peak in the i-th week.

[0075] like Figure 5 As shown, the present invention also provides an electronic device 100 for implementing the eLoran signal field strength calculation method;

[0076] The electronic device 100 includes a memory 101, at least one processor 102, a computer program 103 stored in the memory 101 and executable on at least one processor 102, and at least one communication bus 104.

[0077] The memory 101 can be used to store the computer program 103. The processor 102 implements the eLoran signal field strength calculation method by running or executing the computer program stored in the memory 101 and calling the data stored in the memory 101.

[0078] The memory 101 may primarily include a program storage area and a data storage area. The program storage area may store the operating system, application programs required for at least one function (such as sound playback function, image playback function, etc.), etc.; the data storage area may store data created based on the use of the electronic device 100 (such as audio data), etc. In addition, the memory 101 may include non-volatile memory, such as hard disk, RAM, plug-in hard disk, smart media card (SMC), secure digital (SD) card, flash card, at least one disk storage device, flash memory device, or other non-volatile solid-state storage device.

[0079] At least one processor 102 may be a Central Processing Unit (CPU), or other general-purpose processors, digital signal processors (DSPs), application-specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. Processor 102 may be a microprocessor or any conventional processor. Processor 102 is the control center of electronic device 100, connecting various parts of electronic device 100 via various interfaces and lines.

[0080] The memory 101 in the electronic device 100 stores multiple instructions to implement an eLoran signal field strength calculation method, and the processor 102 can execute multiple instructions to achieve the following:

[0081] S1: Obtain the eLoran signal, antenna factor and feeder loss parameters, and linearly average the eLoran signal to obtain the peak values ​​of each peak before 37.5μs in the eLoran signal;

[0082] S2: Calculate the signal envelope amplitude at 25μs based on the peak values ​​of each peak before 37.5μs, the preset amplitude ratio, and the preset weights;

[0083] S3: The signal field strength is calculated based on the signal envelope amplitude at 25μs and the obtained antenna factor and feeder loss parameters.

[0084] In some embodiments, if the modules / units integrated in the electronic device 100 are implemented as software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, all or part of the processes in the methods of the above embodiments can also be implemented by a computer program instructing related hardware. The computer program can be stored in a computer-readable storage medium, and when executed by a processor, it can implement the steps of the various method embodiments described above. The computer program includes computer program code, which can be in the form of source code, object code, executable files, or certain intermediate forms. The computer-readable medium can include: any entity or device capable of carrying computer program code, recording media, USB flash drives, portable hard drives, magnetic disks, optical disks, computer memory, and read-only memory (ROM).

[0085] Those skilled in the art will understand that embodiments of the present invention can be provided as methods, systems, or computer program products. Therefore, the present invention can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present invention can take the form of a computer program product embodied 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.

[0086] This invention is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, generate instructions for implementing the flowchart illustrations and / or block diagrams. Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0087] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0088] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0089] In the description of this specification, references to terms such as "an embodiment," "example," "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0090] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the specific implementation of the present invention. Any modifications or equivalent substitutions that do not depart from the spirit and scope of the present invention should be covered within the scope of protection of the claims of the present invention.

Claims

1. A method of eLoran signal field strength calculation, characterized by, The method comprises the following steps: obtaining an eLoran signal, an antenna factor and a feeder loss parameter, linearly averaging the eLoran signal to obtain peak values of peaks before 37.5 μs in the eLoran signal; calculating a signal envelope amplitude at 25 μs according to the peak values of the peaks before 37.5 μs, a preset amplitude ratio relationship and a preset weight value, specifically using the following formula: calculating a signal field strength according to the signal envelope amplitude at 25 μs and the obtained antenna factor and feeder loss parameter, specifically as follows: signal field strength = signal envelope amplitude at 25 μs - antenna factor + feeder loss parameter In the formula, AM represents the signal envelope amplitude at 25 μs, WEi represents a weight value corresponding to the calculation of the i-th peak value, Ai represents a peak value corresponding to the i-th positive peak, POi represents a ratio of the signal envelope amplitude at 25 μs to the peak value of the i-th positive peak, Bi represents a peak value corresponding to the i-th negative peak, and NEi represents a ratio of the signal envelope amplitude at 25 μs to the peak value of the i-th negative peak.

2. The eLoran signal field strength calculation method of claim 1, wherein, The eLoran signal is linearly averaged according to GRI.

3. The eLoran signal field strength calculation method of claim 1, wherein, The preset amplitude ratio relationship is an absolute value BR(t) of a ratio of the peak values of the peaks before 37.5 μs to the signal envelope amplitude at 25 μs, specifically as follows: where BR(t) represents the absolute value of the ratio of the peak value of each peak before 37.5 μs to the signal envelope amplitude at 25 μs; where BR(t) represents the absolute value of the ratio of the peak value of each peak before 37.5 μs to the signal envelope amplitude at 25 μs; where BR(t) represents the absolute value of the ratio of the peak value of each peak before 37.5 μs to the signal envelope amplitude at 25 μs; where BR(t) represents the absolute value of the ratio of the peak value of each peak before 37.5 μs to the signal envelope amplitude at 25 μs; 4. The eLoran signal field strength calculation method of claim 1, wherein, The peak values of the peaks before 37.5 μs include a third positive peak value A3, a second positive peak value A2, a first positive peak value A1, a fourth negative peak value B4, a third negative peak value B3, a second negative peak value B2 and a first negative peak value B1. The preset weight value is determined according to an output signal characteristic obtained by a signal processing method, specifically as follows: if a signal amplitude is greater, the greater the accuracy, then the weight values of A3 and B4 are set to 0.3-0.4, the weight values of A2 and B3 are set to 0.1-0.2, and the weight values of A1, B1 and B2 are set to 0-0.1, and the sum of the weight values of A1, A2, A3, B1, B2, B3 and B4 is 1.

5. An eLoran signal field strength calculation system characterized by, If a signal amplitude is smaller, the greater the accuracy, then the weight values of A3 and B4 are set to 0-0.1, the weight values of A2 and B3 are set to 0.1-0.2, and the weight values of A1, B1 and B2 are set to 0.3-0.4, and the sum of the weight values of A1, A2, A3, B1, B2, B3 and B4 is 1. The method for calculating the eLoran signal field strength according to any one of claims 1-4 comprises: an obtaining unit configured to obtain an eLoran signal, an antenna factor and a feeder loss parameter, linearly average the eLoran signal to obtain peak values of peaks before 37.5 μs in the eLoran signal; a first calculating unit configured to calculate a signal envelope amplitude at 25 μs according to the peak values of the peaks before 37.5 μs, a preset amplitude ratio relationship and a preset weight value; 6. An electronic device, comprising: a second calculating unit configured to calculate a signal field strength according to the signal envelope amplitude at 25 μs and the obtained antenna factor and feeder loss parameter. The method comprises a processor and a memory, and the processor is configured to execute a computer program stored in the memory to implement the method for calculating the eLoran signal field strength according to any one of claims 1-4.

7. A computer readable storage medium characterized in that, The computer readable storage medium stores at least one instruction, and the at least one instruction is executed by the processor to implement the eLoran signal field strength calculation method in any one of claims 1 to 4.

Images