WO2020155911A1

WO2020155911A1 - Positioning chip information processing method and terminal device

Info

Publication number: WO2020155911A1
Application number: PCT/CN2019/126613
Authority: WO
Inventors: 谭伟强
Original assignee: 泰斗微电子科技有限公司
Priority date: 2019-01-31
Filing date: 2019-12-19
Publication date: 2020-08-06
Also published as: CN109828290A

Abstract

A positioning chip information processing method and a terminal device, the method comprising: obtaining information to be output (101); in accordance with preset rules, structuring the information to be output as an output statement of a fixed length (102); outputting the output statement (103). It is thus possible to solve the problem in the prior art in which an upper computer must perform format conversion prior to being able to use content output by a positioning chip, increasing the amount of code and storage resources required for upper computer processing. The present invention thus reduces the code and storage resources required for upper computer processing, and reduces the upper computer resources used for processing other events.

Description

Information processing method for positioning chip and terminal equipment

Technical field

The invention belongs to the technical field of positioning, and in particular relates to a method and terminal equipment for information processing of a positioning chip.

Background technique

The positioning chip generally outputs time, latitude, longitude, altitude, speed, and satellite signals and other related positioning information through the serial port. The default output mode of the positioning chip is NMEA0183 format. After receiving the information output by the positioning chip, the upper computer extracts the required information, performs format conversion, and then performs corresponding processing.

In application equipment, such as positioning watches, trackers, etc., most of the upper computer positioning chips will choose low-power models. This type of positioning chip resource is not too much, and the storage space of Flash and memory RAM used to store the code is very small. However, to locate the content output by the chip, the host computer needs to perform format conversion before using it, which increases the code and storage resources required for the host computer to process and reduces the host computer's resources for processing other events.

Summary of the invention

In view of this, the embodiments of the present invention provide a method and terminal equipment for information processing of a positioning chip to solve the problem of the content output by the positioning chip in the prior art. The upper computer needs to perform format conversion before using it, and the upper computer is added. The code and storage resources required for processing reduce the problem of resources for the host computer to process other events.

The first aspect of the embodiments of the present invention provides a method for processing information of a positioning chip, including:

Obtain the information to be output;

According to preset rules, constructing the information to be output into fixed-length output sentences;

The output sentence is output.

In an embodiment, the obtaining information to be output includes:

The received satellite signal is decoded, and the decoded satellite positioning information is obtained, where the satellite positioning information is the information to be output.

In an embodiment, the output sentence includes N fields, each field requires a fixed number of bytes, and the sequence of the N fields is not fixed, and N is greater than or equal to 1.

In an embodiment, the output sentence includes: sentence start character, time, longitude, latitude, end identifier, and check code fields, as well as fields other than the sentence start character, the end identifier, and the check code. The separator that separates the fields outside the code.

In an embodiment, the output sentence further includes: at least one field of information identification, positioning indication, altitude, speed, direction, number of satellites participating in positioning, average carrier-to-noise ratio of satellite signals, and standby information.

In an embodiment, the constructing the information to be output into a fixed-length output sentence according to a preset rule includes:

According to each field included in the output sentence and the separator, the information to be output is used to assign a value to each field, and the assigned fields constitute an output sentence.

In one embodiment, the delimiter is a comma, a semicolon, at least one space, or a symbol indicating a delimiting function.

A second aspect of the embodiments of the present invention provides an information processing device for a positioning chip, including:

Obtaining module for obtaining information to be output;

A processing module, configured to construct the information to be output into fixed-length output sentences according to preset rules;

The output module is used to output the output sentence.

A third aspect of the embodiments of the present invention provides a terminal device, including: a memory, a processor, and a computer program stored in the memory and running on the processor, and the processor executes the computer program When realizing the steps of the method described above for information processing of the positioning chip.

A fourth aspect of the embodiments of the present invention provides a computer-readable storage medium, including: the computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, it realizes the information processing of the positioning chip as described above. The steps of the method.

Compared with the prior art, the embodiment of the present invention has the following beneficial effects: by constructing the information to be output as a fixed-length output sentence according to preset rules; outputting the output sentence, so that the host computer obtains the output of the positioning chip After the statement, no further processing or adjustment is required to support the application requirements of the upper computer, and to a large extent reduce the demand for processing resources of the upper computer.

Description of the drawings

In order to more clearly explain the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings needed in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only of the present invention. For some embodiments, for those of ordinary skill in the art, other drawings may be obtained based on these drawings without creative labor.

FIG. 1 is a schematic diagram of an implementation flow of a method for processing information of a positioning chip provided by an embodiment of the present invention;

FIG. 2 is an exemplary diagram of a device for information processing of a positioning chip provided by an embodiment of the present invention;

Fig. 3 is a schematic diagram of a terminal device provided by an embodiment of the present invention.

detailed description

In the following description, for the purpose of illustration rather than limitation, specific details such as a specific system structure and technology are proposed for a thorough understanding of the embodiments of the present invention. However, it should be clear to those skilled in the art that the present invention can also be implemented in other embodiments without these specific details. In other cases, detailed descriptions of well-known systems, devices, circuits, and methods are omitted to avoid unnecessary details from obstructing the description of the present invention.

In order to illustrate the technical solution of the present invention, specific embodiments are used for description below.

FIG. 1 is a schematic diagram of the implementation process of a method for processing information of a positioning chip according to an embodiment of the present invention, and the details are as follows:

Step 101: Obtain information to be output.

Optionally, the information to be output is positioning information obtained by the positioning chip, and the information to be output includes time information, latitude and longitude information, speed, and so on. Step 101 specifically includes: the positioning chip decodes the received satellite signal, and obtains the decoded satellite positioning information, where the satellite positioning information is the information to be output.

Further, the positioning chip decodes the received satellite signal, which specifically includes: the positioning chip decodes the received satellite signal by time decoding and ephemeris decoding, time decoding is decoding time data from the satellite signal, and ephemeris decoding is slave Ephemeris data is decoded from the satellite signal.

Ephemeris refers to the precise position or trajectory table of a flying object that changes with time in GPS surveys. It is a function of time. The satellite ephemeris uses the mathematical relationship between the six orbital parameters of Kepler's law to determine the time, coordinates, azimuth, speed and other parameters of the flying body, with extremely high accuracy. Satellite ephemeris information is also called ephemeris. Ephemeris data is used to indicate the predetermined location of a star at regular intervals, or the predetermined location of an artificial satellite at regular intervals.

Step 102: Construct the information to be output into a fixed-length output sentence according to a preset rule.

Optionally, the output sentence in step 102 includes N fields, the number of bytes required for each field is fixed, the order between the N fields is not fixed, and the N is greater than or equal to 1. The number of bytes required for each field can be set according to requirements. When the setting is completed, the format of each output statement is fixed, and the number of bytes required for each field is also fixed. When it is necessary to change the required bytes for each field When counting, you can reset the output sentence.

Optionally, the output sentence includes at least: sentence start character, time, longitude, latitude, end identifier and check code fields, and except for the sentence start character, the end identifier and the check code The separator that separates fields other than those.

Further, the output sentence may also include at least one field among information identification, positioning indication, altitude, speed, direction, number of satellites participating in positioning, average carrier-to-noise ratio of satellite signals, and standby information.

Optionally, since the 14 fields and 10 separators in the output sentence can cover most applications, the embodiment of the present invention uses the output sentence to include 14 fields and 10 separators for detailed description, that is, the output sentence Including: sentence start character, information identifier, time, positioning indication, longitude, latitude, altitude, speed, direction, number of satellites involved in positioning, satellite signal average carrier-to-noise ratio, spare information, end identifier and check code 14 fields , And 10 separators for separating each field except the sentence start character, the end identifier, and the check code.

The sentence start character is represented by "$" and represented by 1 byte.

The information identifier may be a company name or other fixed-purpose information identifiers, and may be represented by "CCCCC", which is represented by 5 bytes. For example, CCCCC can be TDINF, which represents the company name.

Optionally, the time is represented by "YYYYMMDD" and "hhmmss". Optionally, the time can also be expressed in other ways, such as "MMDDYYYY" or "YYYY, MM, DD". In this embodiment, the time is represented by "YYYYMMDD" and "hhmmss" as an example for detailed description. In the “YYYYMMDD”, YYYY represents the year, MM represents the month, and DD represents the date, and the “YYYYMMDD” is 8 bytes; for example, “YYYYMMDD” can be 20181126, and 20181126 represents November 26, 2018. The format of the year, month, and day defined in the prior art NMEA is: DDMMYY, which needs to be further processed before output. Add 2000 to the year, and finally use four bytes to represent the year. For example, 2018, compared to the year, month, and day in this embodiment The representation mode of operation is more cumbersome.

In the "hhmmss", hh means hours, mm means minutes, ss means seconds, and the "hhmmss" is 6 bytes. For example, "hhmmss" can be 123456, and 123456 means 12:34:56.

The positioning indication is represented by "A/V", where A indicates that the positioning data is available, and V indicates that the positioning data is not available. Only one byte is included in the output sentence, that is, only A or V is output.

Optionally, the longitude is represented by positive and negative values, a positive value represents east longitude, a negative value represents west longitude, or a positive value represents west longitude, and a negative value represents east longitude and west longitude. In this embodiment, a positive value represents the east longitude and a negative value represents the west longitude as an example for detailed description. For example, longitude is expressed as "±lll.llllll", where "﹢lll.llllll" means east longitude and "﹣lll.llllll" means west longitude. It should be noted that the number of digits after the decimal point can be adjusted as needed. For example, the longitude can be +113.431417, which means 113.431417 degrees east longitude. The format of longitude defined in the prior art NMEA is "yyyyy.y", where the first three digits indicate degrees, the last digit and one digit after the decimal point indicate minutes, that is, "yy" means "minutes. minutes", which needs to be changed when outputting. Many codes convert the longitude into the unit "degree. degree" required by the host computer. For example, the acquired longitude information is "float y=11325.86096", which needs to be converted as follows: degy=y/100+(yy/100)/60.0, which requires multiple division operations, which greatly increases the host computer Processing resource requirements. In addition, it is necessary to read the NMEA identifier "E" or "W" to determine whether the value is the east longitude or the west longitude. The operation is extremely complicated. However, the solution provided in this embodiment is used to directly determine whether it is east longitude or west longitude through positive and negative signs, and the longitude value can be directly read to output.

Optionally, the latitude is represented by positive and negative values, a positive value represents north latitude, a negative value represents south latitude, or a positive value represents south latitude, and a negative value represents north latitude. In this embodiment, a positive value represents north latitude and a negative value represents south latitude as an example for detailed description. For example, the latitude is expressed as "±yy.yyyyyy", where "﹢yy.yyyyyy" means north latitude and "﹣yy.yyyyyy" means south latitude. It should be noted that the number of digits after the decimal point can be adjusted as needed. For example, the latitude can be -23.165448, which means 23.165448 degrees south latitude. The representation format of latitude in the prior art is similar to that of longitude, and multiple format conversions are required to obtain the format required by the host computer. Therefore, the format used in this embodiment is simple to operate and reduces the demand for processing resources of the host computer.

The height can be represented by "±hhhh.h", which is represented by 7 bytes. It should be noted that the value of the number of digits before and after the decimal point can be set according to specific requirements, and this is only illustrative. For example, the height can be 0025.6. The format length of the prior art is not fixed, and data segmentation is required when reading. Therefore, the format adopted in this embodiment is simple to operate, which reduces the demand for processing resources of the host computer.

The speed can be represented by "kkk.k", the unit can be km/h, or m/s, and it can be represented by 5 bytes. It should be noted that the unit can be set according to specific needs, which is only illustrative here. For example, the speed can be 034.1. The length of the speed in the prior art NMEA is not fixed, and operations such as rounding should be performed according to the speed output of the host computer. However, the solution provided in this embodiment can be directly obtained and used, which improves the processing speed and reduces the demand for processing resources of the host computer.

The direction can be represented by "bbb.b", the unit is degree, and it is represented by 5 bytes. For example, the direction can be 173.5. The length of the direction in the prior art NMEA is not fixed, and operations such as rounding should be performed according to the direction output of the host computer. However, the solution provided in this embodiment can be directly obtained and used, which improves the processing speed and reduces the demand for processing resources of the host computer.

The number of satellites participating in positioning is represented by "ss" and represented by 2 bytes. Used to comprehensively judge the strength of the satellite signal.

The average carrier-to-noise ratio of the satellite signal is represented by "nn", which is represented by 2 bytes. Used to comprehensively judge the strength of the satellite signal. This field is not defined in the prior art NMEA, and the host computer is required to read multiple satellite signals from multiple GSV sentences to obtain multiple carrier-to-noise ratios, and then calculate the average value of the multiple carrier-to-noise ratios, which increases the host computer Demand for computing resources.

The spare information can be represented by "XXXX", which is represented by 4 bytes. Used to output some spare information.

The end identifier can be represented by "*" and represented by 1 byte.

The check code can be represented by "HH" and represented by 2 bytes.

Further, the delimiter is a comma, a semicolon, at least one space, or a symbol representing a delimiting function. In this embodiment, a comma is used for division for detailed description. For example, each field in the output sentence except the sentence start character, the end identifier and the check code is separated by a comma, that is, "$CCCCC, YYYYMMDDhhmmss, A/V, ±lll.llllll, ±yy.yyyyyy, ±hhhh.h, kkk.k, bbb.b, ss, nn, XXXX*HH" are separated by 10 commas.

Further, this step may specifically include: assigning a value to each field using the information to be output according to each field included in the output sentence and the separator, and the assigned fields constitute an output sentence.

Step 103: Output the output sentence.

After the host computer obtains the output sentence output by the positioning chip, it directly reads and then executes the corresponding operation.

In the above method for processing information of the positioning chip, the information to be output is constructed into a fixed-length output sentence according to a preset rule; the output sentence is output so that the host computer obtains the output sentence of the positioning chip without further Processing or adjustment can support the application requirements of the upper computer and greatly reduce the demand for processing resources of the upper computer.

It should be understood that the size of the sequence number of each step in the foregoing embodiment does not mean the order of execution. The execution sequence of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiment of the present invention.

Corresponding to the information processing method of the positioning chip described in the above embodiment, FIG. 2 shows an example diagram of the information processing apparatus of the positioning chip provided in an embodiment of the present invention. As shown in FIG. 2, the device may include: an acquisition module 201, a processing module 202, and an output module 203.

The obtaining module 201 is used to obtain information to be output.

The processing module 202 is configured to construct the information to be output into a fixed-length output sentence according to preset rules.

The output module 203 is used to output the output sentence.

Optionally, the acquisition module 201 is specifically configured to decode the received satellite signals and acquire decoded satellite positioning information, where the satellite positioning information is the information to be output.

Optionally, the output sentence includes N fields, the number of bytes required to form each field is fixed, the sequence between the N fields is not fixed, and the N is greater than or equal to 1. The number of bytes required for each field can be set according to requirements. When the setting is completed, the format of each output statement is fixed, and the number of bytes required for each field is also fixed. When it is necessary to change the required bytes for each field When counting, you can reset the output sentence.

Optionally, the sentence start character is represented by "$" and represented by 1 byte.

The direction can be represented by "bbb.b", the unit is degree, and it is represented by 5 bytes. For example, the direction can be 173.5. In the prior art NMEA, the length of the direction is not fixed, and operations such as rounding should be performed according to the direction output of the host computer. However, the solution provided in this embodiment can be directly obtained and used, which improves the processing speed and reduces the demand for processing resources of the host computer.

The end identifier can be represented by "*" and represented by 1 byte.

The check code can be represented by "HH" and represented by 2 bytes.

Further, the delimiter is a comma, a semicolon, at least one space, or a symbol representing a delimiting function. In this embodiment, a comma is used for division for detailed description. For example, each field in the output sentence except the sentence start character, the end identifier and the check code is separated by a comma, that is, "$CCCCC, YYYYMMDDhhmmss, A/V, ±lll.llllll, ±yy.yyyyyy, ±hhhh.h, kkk.k, bbb.b, ss, nn, XXXX*HH" are separated by 10 commas. .

Optionally, the processing module 203 is specifically configured to use the information to be output to assign a value to each field according to each field included in the output sentence and the separator, and the assigned fields form an output sentence.

In the above-mentioned information processing device for positioning chip, the processing module constructs the information to be output into a fixed-length output sentence according to preset rules; the output module outputs the output sentence so that the host computer obtains the output sentence of the positioning chip, No further processing or adjustment is required to support the application requirements of the upper computer, and to a large extent reduce the demand for processing resources of the upper computer.

Fig. 3 is a schematic diagram of a terminal device provided by an embodiment of the present invention. As shown in FIG. 3, the terminal device 3 of this embodiment includes: a processor 301, a memory 302, and a computer program 303 stored in the memory 302 and running on the processor 301, such as information processing of a positioning chip program of. When the processor 301 executes the computer program 303, the steps in the embodiment of the method for processing the information of the positioning chip are implemented, for example, steps 101 to 103 shown in FIG. 1. When the processor 301 executes the computer program 303, the functions of the modules in the foregoing device embodiments, for example, the functions of the modules 201 to 203 shown in FIG. 2 are realized.

Exemplarily, the computer program 303 may be divided into one or more program modules, and the one or more program modules are stored in the memory 302 and executed by the processor 301 to complete the present invention. . The one or more program modules may be a series of computer program instruction segments capable of completing specific functions, and the instruction segments are used to describe the execution of the computer program 303 in the information processing device of the positioning chip or the terminal device 3. process. For example, the computer program 303 may be divided into an acquisition module 201, a processing module 202, and an output module 203. The specific functions of each module are shown in FIG. 2 and will not be repeated here.

The terminal device 3 may be a computing device such as a desktop computer, a notebook, a palmtop computer, and a cloud server. The terminal device may include, but is not limited to, a processor 301 and a memory 302. Those skilled in the art can understand that FIG. 3 is only an example of the terminal device 3, and does not constitute a limitation on the terminal device 3. It may include more or less components than shown in the figure, or a combination of certain components, or different components. For example, the terminal device may also include input and output devices, network access devices, buses, etc.

The so-called processor 301 may be a central processing unit (Central Processing Unit, CPU), other general-purpose processors, digital signal processors (Digital Signal Processor, DSP), application specific integrated circuits (Application Specific Integrated Circuit, ASIC), Ready-made programmable gate array (Field-Programmable Gate Array, FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. The general-purpose processor may be a microprocessor or the processor may also be any conventional processor or the like.

The memory 302 may be an internal storage unit of the terminal device 3, such as a hard disk or memory of the terminal device 3. The memory 302 may also be an external storage device of the terminal device 3, for example, a plug-in hard disk equipped on the terminal device 3, a smart memory card (Smart Media Card, SMC), and a Secure Digital (SD) Card, Flash Card, etc. Further, the memory 302 may also include both an internal storage unit of the terminal device 3 and an external storage device. The memory 302 is used to store the computer program and other programs and data required by the terminal device 3. The memory 302 can also be used to temporarily store data that has been output or will be output.

Those skilled in the art can clearly understand that for the convenience and conciseness of description, only the division of the above functional units and modules is used as an example. In actual applications, the above functions can be allocated to different functional units, Module completion means dividing the internal structure of the device into different functional units or modules to complete all or part of the functions described above. The functional units and modules in the embodiments can be integrated into one processing unit, or each unit can exist alone physically, or two or more units can be integrated into one unit. The above-mentioned integrated units can be hardware-based Formal realization can also be realized in the form of software functional units. In addition, the specific names of the functional units and modules are only for the convenience of distinguishing each other, and are not used to limit the protection scope of the present application. For the specific working process of the units and modules in the foregoing system, reference may be made to the corresponding process in the foregoing method embodiment, which will not be repeated here.

In the above-mentioned embodiments, the description of each embodiment has its own focus. For parts that are not detailed or recorded in an embodiment, reference may be made to related descriptions of other embodiments.

A person of ordinary skill in the art may be aware that the units and algorithm steps of the examples described in combination with the embodiments disclosed herein can be implemented by electronic hardware or a combination of computer software and electronic hardware. Whether these functions are performed by hardware or software depends on the specific application and design constraint conditions of the technical solution. Professionals and technicians can use different methods for each specific application to implement the described functions, but such implementation should not be considered as going beyond the scope of the present invention.

In the embodiments provided by the present invention, it should be understood that the disclosed device/terminal device and method may be implemented in other ways. For example, the device/terminal device embodiments described above are merely illustrative. For example, the division of the modules or units is only a logical function division, and there may be other divisions in actual implementation, such as multiple units. Or components can be combined or integrated into another system, or some features can be omitted or not implemented. In addition, the displayed or discussed mutual coupling or direct coupling or communication connection may be indirect coupling or communication connection through some interfaces, devices or units, and may be in electrical, mechanical or other forms.

The units described as separate components may or may not be physically separate, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or they may be distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the objectives of the solutions of the embodiments.

In addition, the functional units in the various embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units may be integrated into one unit. The above-mentioned integrated unit can be implemented in the form of hardware or software functional unit.

If the integrated module/unit 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 this understanding, the present invention implements all or part of the processes in the above-mentioned embodiments and methods, and can also be completed by instructing relevant hardware through a computer program. The computer program can be stored in a computer-readable storage medium. When the program is executed by the processor, it can implement the steps of the foregoing method embodiments. . Wherein, the computer program includes computer program code, and the computer program code may be in the form of source code, object code, executable file, or some intermediate forms. The computer-readable medium may include: any entity or device capable of carrying the computer program code, recording medium, U disk, mobile hard disk, magnetic disk, optical disk, computer memory, read-only memory (ROM, Read-Only Memory) , Random Access Memory (RAM, Random Access Memory), electrical carrier signal, telecommunications signal, and software distribution media, etc. It should be noted that the content contained in the computer-readable medium can be appropriately increased or decreased in accordance with the requirements of the legislation and patent practice in the jurisdiction. For example, in some jurisdictions, according to the legislation and patent practice, the computer-readable medium Does not include electrical carrier signals and telecommunication signals.

The above-mentioned embodiments are only used to illustrate the technical solutions of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that it can still implement the foregoing The technical solutions recorded in the examples are modified, or some of the technical features are equivalently replaced; these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention, and should be included in Within the protection scope of the present invention.

Claims

A method for information processing of a positioning chip, characterized in that it comprises:

Obtain the information to be output;

According to preset rules, constructing the information to be output into fixed-length output sentences;

The output sentence is output.
The method for processing information of a positioning chip according to claim 1, wherein said obtaining the information to be output comprises:

The received satellite signal is decoded, and the decoded satellite positioning information is obtained, where the satellite positioning information is the information to be output.
The method for information processing of a positioning chip according to claim 2, wherein the output sentence contains N fields, each field requires a fixed number of bytes, and the order between the N fields is not fixed , N is greater than or equal to 1.
The method for processing information of a positioning chip according to claim 3, wherein the output sentence includes: sentence start character, time, longitude, latitude, end identifier and check code fields, and except for the sentence A separator that separates fields other than the start character, the end identifier, and the check code.
The method for information processing of a positioning chip according to claim 4, wherein the output sentence further includes: information identification, positioning indication, altitude, speed, direction, number of satellites participating in positioning, and average carrier noise of satellite signals At least one field in the ratio and spare information.
8. The method for processing information of a positioning chip according to claim 5, wherein said constructing said information to be output into a fixed-length output sentence according to a preset rule comprises:

According to each field included in the output sentence and the separator, the information to be output is used to assign a value to each field, and the assigned fields constitute an output sentence.
The method for processing information of a positioning chip according to claim 6, wherein the separator is a comma, a semicolon, at least one space, or a symbol representing a division effect.
An information processing device for positioning a chip, characterized in that it comprises:

Obtaining module for obtaining information to be output;

A processing module, configured to construct the information to be output into fixed-length output sentences according to preset rules;

The output module is used to output the output sentence.
A terminal device, comprising a memory, a processor, and a computer program stored in the memory and capable of running on the processor, wherein the processor executes the computer program as claimed in claims 1 to 7 Steps of any of the methods.
A computer-readable storage medium storing a computer program, wherein the computer program implements the steps of the method according to any one of claims 1 to 7 when the computer program is executed by a processor.