Time synchronization method and equipment for microwave bidirectional link measurement

Abstract

The embodiment of the invention relates to the field of satellite time synchronization, and discloses a time synchronization method for microwave two-way link measurement, which comprises the following steps: constructing a two-way link measurement model between a master observation station and a slave observation station; based on the bidirectional link measurement model, obtaining a measurement difference value generated after the master measurement station and the slave measurement station measure the same measurement object therebetween; obtaining the clock difference between the clock of the master observation station and the clock of the slave observation station based on the measurement difference value; and completing time synchronization between the master observation station and the slave observation station based on the clock difference. According to the technical scheme disclosed by the invention, the problem that the inter-station time synchronization precision cannot meet the system application precision requirement in the existing satellite two-way time synchronization is solved, and the hardware configuration of the inter-station two-way synchronization is simple.

Description

Technical Field

[0001] The embodiments of the present invention relate to the field of satellite time synchronization technology, and in particular to a time synchronization method and device for microwave bidirectional link measurement. Background Art

[0002] In the field of satellite two-way time synchronization, a method is to synchronize the time between stations through microwave links using geosynchronous satellites as intermediaries. This method is currently the most accurate radio remote real-time time synchronization method in the world and is widely used in atomic time comparisons between international timekeeping laboratories. However, in this method, time synchronization between stations through microwave links is a prerequisite for multi-station distributed collaborative work, such as multi-station collaborative navigation, multi-station time difference positioning, etc. There are problems such as the time synchronization accuracy between stations cannot meet the accuracy requirements of system applications, and the hardware structure of the communication link with satellites as repeaters is complex and costly. Summary of the invention

[0003] The purpose of the present invention is to at least provide a time synchronization method and device for microwave bidirectional link measurement, which can at least solve the problem that the time synchronization accuracy between stations in the current satellite bidirectional time synchronization cannot meet the system application accuracy requirements, and at least simplify the hardware configuration of the bidirectional link between stations.

[0004] To solve the above technical problems, at least one embodiment of the present application provides a time synchronization method for microwave bidirectional link measurement, including: constructing a bidirectional link measurement model between a master station and a slave station; obtaining a measurement difference generated by the master station and the slave station after measuring the same measurement object between each other based on the bidirectional link measurement model; obtaining a clock difference between the clocks of the master station and the slave station based on the measurement difference; and completing time synchronization between the master station and the slave station based on the clock difference.

[0005] At least one embodiment of the present application further provides a time synchronization device for microwave bidirectional link measurement, comprising: a measurement model construction module, used to construct a bidirectional link measurement model between a master station and a slave station; a measurement difference calculation module, used to obtain, based on the bidirectional link measurement model, a measurement difference generated by the master station and the slave station after measuring the same measurement object between each other; a clock difference acquisition module, used to obtain the clock difference between the master station and the slave station based on the measurement difference; and a synchronization implementation module, used to complete the time synchronization between the master station and the slave station based on the clock difference.

[0006] At least one embodiment of the present application also provides an electronic device, comprising: at least one processor; and a memory communicatively connected to the at least one processor; wherein the memory stores instructions executable by the at least one processor, and the instructions are executed by the at least one processor so that the at least one processor can execute the above-mentioned time synchronization method for microwave bidirectional link measurement.

[0007] At least one embodiment of the present application further provides a computer-readable storage medium storing a computer program, wherein the computer program, when executed by a processor, implements the above-mentioned time synchronization method for microwave bidirectional link measurement.

[0008] The embodiment of the present application provides a time synchronization method and device for microwave bidirectional link measurement. The method measures the bidirectional link between two measuring stations, measures the same measuring object between the two stations to obtain the measurement difference, and infers the clock difference of the two stations based on the measurement difference, so that the master measuring station in the two stations can realize the clock synchronization correction of the slave measuring station according to the clock difference. The technical solution of the present application does not need to be relayed by satellite, but only needs two measuring stations to realize high-precision time synchronization and ranging between the two stations, and the hardware is simple, the ranging link is simple, the implementation cost is low, and it can support a one-master-multiple-slave working mode, and support high-precision time synchronization between multiple satellites.

[0009] In some optional embodiments, the construction of a bidirectional link measurement model between a master station and a slave station includes: constructing the master station and the slave station, wherein the master station and the slave station are respectively equipped with a signal transceiver link composed of the same baseband and / or low intermediate frequency module, K frequency conversion module and transceiver integrated antenna; wherein the master station and the slave station transmit and receive signals to each other through their own built-in signal transceiver links to form a bidirectional link measurement model between the master station and the slave station. This embodiment constructs a bidirectional link measurement between two stations, and performs the same hardware configuration on the two stations to transmit signals to each other, so that the ranging link is simple and the hardware configuration is also simple, thereby achieving low-cost configuration.

[0010] In some optional embodiments, the obtaining of the measurement difference between the master station and the slave station after measuring the same measurement object based on the bidirectional link measurement model includes: obtaining the first starting time when the master station sends the ranging time signal, and the second starting time when the slave station sends the ranging signal; obtaining the first receiving starting time when the master station receives the ranging time signal sent by the slave station at the second starting time, and the second receiving starting time when the slave station receives the ranging time signal sent by the master station at the first starting time; obtaining the first time interval based on the first starting time and the first receiving starting time, and obtaining the second time interval based on the second starting time and the second receiving starting time; obtaining the measurement difference between the master station and the slave station after measuring the same measurement object based on the first time interval and the second time interval. This embodiment obtains the time interval between the sending and receiving signals of the two stations by respectively obtaining the starting time of the two stations, thereby providing a data basis for generating the measurement difference between the two stations, so as to achieve high-precision time synchronization between satellites.

[0011] In some optional embodiments, the method further includes: obtaining, by equipment calibration, a first transmission delay parameter and a first reception delay parameter of the master station, and a second transmission delay parameter and a second reception delay parameter of the slave station. In this embodiment, by calibrating the delay parameters of the transmitting equipment and the receiving equipment of the two stations, the time interval between the transmitting and receiving signals of the two stations is accurately obtained to achieve time synchronization with higher precision.

[0012] In some optional embodiments, the obtaining of the measurement difference between the master station and the slave station after measuring the same measurement object based on the first time interval and the second time interval includes: calculating the time interval difference between the first time interval and the second time interval and the time interval sum; obtaining the time difference between the first starting time and the second starting time when the master station and the slave station send signals to each other based on the time interval difference, the first sending delay parameter, the second sending delay parameter, the first receiving delay parameter, and the second receiving delay parameter; and obtaining the distance between the master station and the slave station based on the time interval sum, the first sending delay parameter, the second sending delay parameter, the first receiving delay parameter, and the second receiving delay parameter. This embodiment obtains the measurement difference including the time difference between the start time of signal transmission of the two stations and the distance between the two stations based on the above-mentioned time interval and delay parameters, so as to achieve synchronization of clock errors between the two stations.

[0013] In some optional embodiments, the time difference between the first starting time and the second starting time when the master station and the slave station send signals to each other is obtained based on the time interval difference, the first sending delay parameter, the second sending delay parameter, the first receiving delay parameter, and the second receiving delay parameter, and the formula is expressed as follows:

[0014] dt=[(T1-T2)-(Tt2-Tt1)-(Tr1-Tr2)] / 2;

[0015] Wherein, dt represents the time difference between the first starting time and the second starting time, T1-T2 represents the time interval difference, Tt2 represents the second sending delay parameter, Tt1 represents the first sending delay parameter, Tr1 represents the first receiving delay parameter, and Tr2 represents the second receiving delay parameter. This embodiment expresses the calculation method of the time difference between the start times of sending signals of two stations through a specific formula to generate a part of the measurement difference and realize the synchronization of the clock difference between the two stations.

[0016] In some optional embodiments, the distance between the master station and the slave station is obtained based on the time interval and value, the first sending delay parameter, the second sending delay parameter, the first receiving delay parameter, and the second receiving delay parameter, and the formula is expressed as follows:

[0017] D=c×τ=c×[(T1+T2)-(Tt1+Tt2)-(Tr1+Tr2)] / 2;

[0018] Wherein, D represents the distance between the master station and the slave station, c represents the speed of light, τ represents the signal propagation delay between the master station and the slave station, T1+T2 represents the time interval and value, Tt1 represents the first transmission delay parameter, Tt2 represents the second transmission delay parameter, Tr1 represents the first reception delay parameter, and Tr2 represents the second reception delay parameter. This embodiment expresses the calculation method of the distance between the two stations through a specific formula to generate another part of the measurement difference, so as to achieve the synchronization of the clock difference between the two stations. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] One or more embodiments are exemplarily described by the pictures in the corresponding drawings, and these exemplary descriptions do not constitute limitations on the embodiments.

[0020] Figure 1 It is a schematic diagram of the process / scenario of implementing a two-way satellite station-to-station time comparison solution in the prior art;

[0021] Figure 2 It is a flow chart of a time synchronization method for microwave bidirectional link measurement;

[0022] Figure 3 is a block diagram of bidirectional link measurement provided by an embodiment of the present application;

[0023] Figure 4 This is a flow chart of a method for generating a measurement difference provided by an embodiment of the present application. Figure 1 ;

[0024] Figure 5 This is a flow chart of a method for generating a measurement difference provided by an embodiment of the present application. Figure 2 ;

[0025] Figure 6 is a schematic diagram of a bidirectional link measurement principle provided by an embodiment of the present application;

[0026] Figure 7 is a schematic diagram of a time synchronization device for microwave bidirectional link measurement provided by another embodiment of the present application;

[0027] Figure 8 It is a schematic diagram of the structure of an electronic device provided by another embodiment of the present application. DETAILED DESCRIPTION

[0028] To make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the embodiments of the present application will be described in detail below in conjunction with the accompanying drawings. However, it will be appreciated by those skilled in the art that in the present application, many technical details are proposed in order to enable the reader to better understand the present application. However, even without these technical details and various changes and modifications based on the following embodiments, the technical scheme claimed in the present application can also be implemented. The division of the following embodiments is for the convenience of description, and the specific implementation of the present application should not be construed as any limitation, and the various embodiments can be combined and referenced with each other under the premise of no contradiction.

[0029] In order to facilitate understanding of the embodiments of the present application, relevant content about inter-station time synchronization is first introduced here.

[0030] Time synchronization between stations is the premise of multi-station distributed collaborative work, such as multi-station collaborative navigation, multi-station time difference positioning, etc., which all require high-precision time synchronization between stations to meet the accuracy requirements of system applications. Typical methods for achieving multi-station remote time comparison include optical fiber two-way time comparison method, satellite two-way time comparison method, and navigation satellite rapid common view method. The following article takes satellite two-way time synchronization as an example to introduce.

[0031] Satellite two-way time synchronization is a method of synchronously measuring the time between stations through microwave links using geosynchronous satellites as intermediaries. The two stations performing time comparison send out signals at the same time, then receive signals from each other and measure the delay between the local transmission and reception signals. By exchanging the measured delay data, the clock difference between the two clocks can be calculated. The clock difference between stations measured by the satellite two-way method can achieve a comparison accuracy of nanoseconds, and the errors caused by the main delays can basically be canceled out. Satellite two-way time comparison can directly obtain high-precision clock difference comparison results between stations in real time every second, with high accuracy and real-time performance, but there is still room for optimization with higher accuracy.

[0032] like Figure 1 The process / scenario diagram of the implementation of the satellite two-way station-to-station time comparison scheme in the prior art shown. The 1PPS signal output by the atomic clock A of station A is divided into two paths, one of which is input to modem A, sent to the satellite via earth station A, and forwarded by the satellite to earth station B. Among them, earth station A is the satellite transceiver A and antenna A in station A, and earth station B is the satellite transceiver B and antenna B in station B. The other path is used as the opening pulse of the local time interval counter A to start counting; the operation of station B is exactly the same as that of station A. Modem A recovers the 1PPS in the received signal and uses it as the closing pulse of time interval counter A. Assume that the readings of time interval counters A and B are ΔT respectively. A , ΔT B The uplink and downlink delays of the signal from station A to the satellite and then to station B are The uplink and downlink delays of the signal from station B to the satellite and then to station A are The delays of the transmitting channel and the receiving channel in station A are The delays of the transmitting channel and the receiving channel in station B are Considering the relativistic effect in the bidirectional link transmission process, the clock difference between station A and station B satisfies the following formula (1):

[0033]

[0034] Where: T A 、T B is the clock time of atomic clock A and atomic clock B at station A and station B; τ AB , τ BA is the satellite equipment delay when the satellite acts as a repeater from station A to station B, and the satellite equipment delay when it is from station B to station A; Δτ R The Sagnac effect is caused by the rotation of the Earth.

[0035] It can be seen that the precision of remote satellite two-way remote time comparison can be verified by using Precise Point Positioning (PPP). Precise point positioning technology is a technology that uses a measurement receiver to receive navigation satellite signals and realizes remote wireless time comparison through data post-processing. It is one of the commonly used methods for international atomic time comparison. Its Class A assessment of time transfer uncertainty is of the same order of magnitude as the satellite two-way time transfer method. By comparing the remote long baseline satellite two-way time accuracy verification test data with the precise point positioning time difference benchmark for difference analysis, considering a certain margin, the satellite two-way time comparison can achieve high-precision time synchronization within 6ns.

[0036] Compared with the prior art, the technical solution of this application can solve at least one of the following problems:

[0037] 1. Based on the satellite two-way time comparison technology, high-precision time synchronization within 6ns can be achieved, and there is room for higher precision optimization.

[0038] 2. Satellite-based two-way time comparison technology requires relaying through satellites, and the ranging and communication links are complex, the hardware structure is complex, and the cost is high.

[0039] In order to solve at least one of the technical problems that the time synchronization accuracy between the above-mentioned stations cannot meet the system application accuracy requirements and the hardware configuration of the bidirectional link between stations is complex, the present invention proposes a time synchronization method and device for microwave bidirectional link measurement. The implementation details of the time synchronization method for microwave bidirectional link measurement of this embodiment are specifically described below. The following content is only the implementation details provided for the convenience of understanding and is not necessary for the implementation of this solution.

[0040] Embodiment 1:

[0041] The time synchronization method for microwave bidirectional link measurement of this embodiment can be applied to electronic devices with communication, computing and data storage capabilities. The specific process can be as follows: Figure 2 As shown, including:

[0042] Step 201: construct a bidirectional link measurement model between a master station and a slave station.

[0043] The master station is a station in the two-way link measurement model, which exchanges signals of a specific frequency band with another station as a slave station, and can also support two-way link communication with multiple other stations. In other words, there is no need to forward signals through satellites as an intermediary, and the two-way link measurement model can directly exchange signals to achieve ranging and high-precision time synchronization.

[0044] Step 202: obtaining, based on the bidirectional link measurement model, a measurement difference generated after the master station and the slave station measure the same measurement object.

[0045] In the bidirectional link measurement model, the master station sends a signal to the slave station at a specific time 1 through a specific frequency 1, and the slave station receives the signal after a certain delay of the specific time 1 through the specific frequency 1. At the same time, the slave station sends a signal to the master station at a specific time 2 through a specific frequency 2, and the master station receives the signal after a certain delay of the specific time 2 through the specific frequency 2. The measurement difference is obtained based on the specific time 1, the specific time 2 and the certain delays as the same measurement objects. In other words, the bidirectional link measurement is a ranging-time comparison method, which enables the master station and the slave station to obtain a relative pseudorange respectively through pseudocode and carrier phase measurement. Step 203, based on the measurement difference, the clock difference between the master station and the slave station is obtained.

[0046] That is to say, in this step, the clock difference between the two stations' clocks can be calculated through the above-mentioned measured difference.

[0047] Step 204: completing time synchronization between the master station and the slave station based on the clock difference.

[0048] In other words, clock errors are eliminated through two-way measurement to achieve ranging and high-precision time synchronization.

[0049] This embodiment provides a time synchronization method for microwave bidirectional link measurement. The method measures the bidirectional link between two measuring stations, measures the same measuring object between the two stations to obtain a measurement difference, and infers the clock difference of the two stations based on the measurement difference, so that the master measuring station in the two stations can realize clock synchronization correction of the slave measuring station according to the clock difference. The technical solution of this application does not require satellite relay, and only needs two measuring stations to realize high-precision time synchronization and ranging between the two. The hardware is simple, the ranging link is simple, the implementation cost is low, and it can support a one-master-multiple-slave working mode, and support high-precision time synchronization between multiple satellites.

[0050] In some embodiments, the constructing of a bidirectional link measurement model between a master station and a slave station includes: constructing the master station and the slave station, wherein the master station and the slave station are respectively equipped with a signal transceiver link composed of the same baseband and / or low intermediate frequency module, a K frequency conversion module and a transceiver integrated antenna; wherein the master station and the slave station transmit and receive signals to each other through their respective built-in signal transceiver links to form a bidirectional link measurement model between the master station and the slave station.

[0051] Specifically, if Figure 3The bidirectional link measurement composition block diagram shown in the figure shows that both station 1 and station 2, as the master station and slave station, are mainly composed of baseband and / or low intermediate frequency modules, K frequency conversion modules and transceiver antennas. The entire signal propagation process is that the baseband and low intermediate frequency modules of station 1 generate low intermediate frequency signals, which are converted into K frequency band signals (f1) by the K frequency conversion module and then sent out by the antenna. The antenna of station 2 receives the low intermediate frequency signals converted by the K frequency conversion module and received by the baseband and low intermediate frequency modules. The signal propagation process of station 2 is basically the same as that of station 1, except that the signal frequency is different (f2). During the whole process, the propagation distances of f1 and f2 are the same. The receivers of station 1 and station 2 respectively calculate the pseudorange and carrier of the transmitted signal and the received signal, compare them to obtain the distance measurement difference, and then deduce the clock difference between the two stations, and then perform clock training. If station 1 is the master station (without training the clock) and station 2 is the slave station, the slave station continuously trains the clock according to the clock difference, and finally achieves clock synchronization with the master station.

[0052] In some embodiments, the measurement difference value generated by the master station and the slave station measuring the same measurement object based on the bidirectional link measurement model can be obtained by: Figure 4 The steps shown are implemented, specifically including:

[0053] Step 401: Acquire a first starting time when the master station sends a ranging time signal and a second starting time when the slave station sends a ranging signal.

[0054] Specifically, the first starting time is the specific time 1 at which the master station sends the ranging time signal at the specific frequency 1, and the second starting time is the specific time 2 at which the slave station sends the ranging time signal at the specific frequency 2. Figure 6 As shown, from the legend, we can see the starting time when the measuring station 1 and the measuring station 2 send the ranging time signal respectively.

[0055] Step 402: Obtain a first receiving start time when the master station receives the ranging time signal sent by the slave station at the second starting time, and a second receiving start time when the slave station receives the ranging time signal sent by the master station at the first starting time.

[0056] Specifically, the first receiving start time is the start time when the master station receives the ranging time signal sent by the slave station at specific frequency 2 at specific time 2 at specific frequency 2, and the second receiving start time is the start time when the slave station receives the ranging time signal sent by the master station at specific frequency 1 at specific time 1 at specific frequency 1. Figure 6 As shown, from the legend, we can see the starting time when station 1 receives the ranging time signal sent by station 2 and the starting time when station 2 receives the ranging time signal sent by station 1.

[0057] Step 403: obtain a first time interval based on the first start time and the first receiving start time, and obtain a second time interval based on the second start time and the second receiving start time.

[0058] Specifically, the first time interval is the interval difference between the specific moment 1 at which the master station sends the ranging time signal at specific frequency 1 and the start moment at which the ranging time signal sent by the slave station at specific frequency 2 at specific moment 2 is received at specific frequency 2, and the second time interval is the interval difference between the specific moment 2 at which the slave station sends the ranging time signal at specific frequency 2 and the start moment at which the ranging time signal sent by the master station at specific frequency 1 at specific moment 1 is received at specific frequency 1. Figure 6 As shown, from the legend, it can be seen that the time interval between the start time of the ranging time signal sent by the measuring station 1 and the start time of the ranging time signal received by the measuring station 2, and the time interval between the start time of the ranging time signal sent by the measuring station 2 and the start time of the ranging time signal received by the measuring station 1.

[0059] Step 404: obtaining, based on the first time interval and the second time interval, a measurement difference generated after the master station and the slave station measure the same measurement object.

[0060] Specifically, the first time interval and the second time interval are important time parameters for calculating the measurement difference. The calculation process of the measurement difference in this step is specifically shown in formulas (2) and (3).

[0061] Embodiment 2:

[0062] The time synchronization method for microwave bidirectional link measurement of this embodiment can be applied to electronic devices with communication, computing and data storage capabilities, and further includes:

[0063] Through equipment calibration, a first transmission delay parameter and a first reception delay parameter of the master station, and a second transmission delay parameter and a second reception delay parameter of the slave station are respectively obtained.

[0064] That is, the delay parameters (Tt1, Tr1, Tt2 and Tr2) of the transmitting and receiving equipment of the two measuring stations can be obtained by calibration using specific methods and equipment.

[0065] Embodiment three:

[0066] In some embodiments, the measurement difference between the master station and the slave station after measuring the same measurement object based on the first time interval and the second time interval can be obtained by: Figure 5 The steps shown are implemented, specifically including:

[0067] Step 501, calculating a time interval difference and a time interval sum between the first time interval and the second time interval;

[0068] Step 502: obtaining a time difference between the first starting time and the second starting time when the master station and the slave station send signals to each other based on the time interval difference, the first sending delay parameter, the second sending delay parameter, the first receiving delay parameter, and the second receiving delay parameter;

[0069] Step 503: Obtain a distance between the master station and the slave station based on the time interval and value, the first sending delay parameter, the second sending delay parameter, the first receiving delay parameter, and the second receiving delay parameter.

[0070] It should be noted that there are three parts of errors in the relative positioning process: the first part is common to every user receiver, including satellite clock error, ephemeris error, receiver clock error, etc.; the second part is the propagation delay error that cannot be measured by the user or calculated by the correction model, such as ionospheric error, tropospheric error, etc.; the third part is the error inherent in each user receiver, including internal noise, channel delay, multipath effect, etc. Using two-way link measurement technology, the first part of the error can be completely eliminated, the second part of the error can be mostly eliminated, which mainly depends on the distance between the two stations, and the third part of the error cannot be eliminated. After actual measurement and calculation, the relative ranging error can reach 0.33m, the carrier measurement error can reach 1.5mm, and the time accuracy is about 1ns, which is a great improvement compared with the satellite-based two-way time comparison technology. At the same time, the relative distance between the two stations can be calculated.

[0071] In some embodiments, the time difference between the first starting time and the second starting time when the master station and the slave station send signals to each other is obtained based on the time interval difference, the first sending delay parameter, the second sending delay parameter, the first receiving delay parameter, and the second receiving delay parameter, and the formula is expressed as follows:

[0072] dt = [(T1-T2) - (Tt2-Tt1) - (Tr1-Tr2)] / 2; (2)

[0073] Among them, dt represents the time difference between the first starting time and the second starting time, T1-T2 represents the time interval difference, Tt2 represents the second sending delay parameter, Tt1 represents the first sending delay parameter, Tr1 represents the first receiving delay parameter, and Tr2 represents the second receiving delay parameter.

[0074] In some embodiments, the distance between the master station and the slave station is obtained based on the time interval and value, the first sending delay parameter, the second sending delay parameter, the first receiving delay parameter, and the second receiving delay parameter, and the formula is expressed as follows:

[0075] D=c×τ=c×[(T1 + T2) - (Tt1 + Tt2) - (Tr1 +Tr2)] / 2; (3)

[0076] Wherein, D represents the distance between the master station and the slave station, c represents the speed of light, τ represents the signal propagation delay between the master station and the slave station, T1+T2 represents the time interval and value, Tt1 represents the first sending delay parameter, Tt2 represents the second sending delay parameter, Tr1 represents the first receiving delay parameter, and Tr2 represents the second receiving delay parameter.

[0077] Specifically, if Figure 6 The schematic diagram of the two-way link measurement principle shown in the figure shows that the two stations performing ranging send ranging time signals to each other at their respective timings. Station 1 sends ranging signals at a fixed time, starting from the time when the signal is sent until the time when the ranging signal sent by station 2 is received, and the time interval is T1. Similarly, station 2 sends ranging signals at a fixed time, starting from the time when the signal is sent until the time when the ranging signal sent by station 1 is received, and the time interval is T2. In addition, Tt1, Tr1, Tt2, and Tr2 correspond to the delay of the transmitting and receiving equipment of the two stations, the time difference dt between the two stations, and the signal propagation delay between the antennas of the two stations is τ. Analysis shows that:

[0078] T1 = Tt2 +τ+ dt + Tr1; (4)

[0079] T2 = Tt1 +τ- dt + Tr2; (5)

[0080] By calculating and solving the above formulas (4) and (5), we finally get:

[0081] The time difference between two stations: dt = [(T1-T2)-(Tt2-Tt1)-(Tr1-Tr2)] / 2; (6)

[0082] The distance between the two station antennas: D = c × τ = c × [(T1 + T2) - (Tt1 + Tt2) - (Tr1 + Tr2)] / 2. (7)

[0083] Embodiment 4:

[0084] Another embodiment of the present application relates to a time synchronization device for microwave bidirectional link measurement. The implementation details of the time synchronization device for microwave bidirectional link measurement of this embodiment are specifically described below. The following content is only for the convenience of understanding the implementation details provided, and is not necessary for the implementation of this solution. The schematic diagram of the time synchronization device for microwave bidirectional link measurement of this embodiment can be as follows Figure 7 As shown, it includes a measurement model building module 701, a measurement difference calculation module 702, a clock difference acquisition module 703 and a synchronization implementation module 704.

[0085] The measurement model building module 701 is used to build a bidirectional link measurement model between a master station and a slave station.

[0086] The measurement difference calculation module 702 is used to obtain, based on the bidirectional link measurement model, a measurement difference generated after the master station and the slave station measure the same measurement object between each other.

[0087] The clock difference obtaining module 703 is used to obtain the clock difference between the clocks of the master station and the slave station based on the measurement difference.

[0088] The synchronization implementation module 704 is used to complete the time synchronization between the master station and the slave station based on the clock difference.

[0089] In some embodiments, the measurement model construction module is specifically used to construct the master measuring station and the slave measuring station, and the master measuring station and the slave measuring station are respectively equipped with a signal transceiver link composed of the same baseband and / or low intermediate frequency module, K frequency conversion module and transceiver integrated antenna; wherein the master measuring station and the slave measuring station transmit and receive signals to each other through their respective built-in signal transceiver links to form a bidirectional link measurement model between the master measuring station and the slave measuring station.

[0090] In some embodiments, the measurement difference calculation module includes a start time unit, a receiving start time unit, a time interval unit and a measurement difference unit;

[0091] The starting time unit is used to obtain a first starting time when the master station sends a ranging time signal, and a second starting time when the slave station sends a ranging signal;

[0092] The receiving start time unit is used to obtain a first receiving start time when the master station receives the ranging time signal sent by the slave station at the second starting time, and a second receiving start time when the slave station receives the ranging time signal sent by the master station at the first starting time;

[0093] The time interval unit is used to obtain a first time interval based on the first start time and the first receiving start time, and to obtain a second time interval based on the second start time and the second receiving start time;

[0094] The measurement difference unit is used to obtain, based on the first time interval and the second time interval, a measurement difference generated after the master station and the slave station measure the same measurement object.

[0095] In some embodiments, the apparatus further comprises a device calibration module for obtaining, through device calibration, a first transmission delay parameter and a first reception delay parameter of the master station, and a second transmission delay parameter and a second reception delay parameter of the slave station.

[0096] In some embodiments, the measurement difference unit includes a time interval calculation unit, a time difference calculation unit, and a distance calculation unit;

[0097] The time interval calculation unit is used to calculate the time interval difference and the time interval sum between the first time interval and the second time interval;

[0098] The time difference calculation unit is used to obtain the time difference between the first starting time and the second starting time when the master station and the slave station send signals to each other based on the time interval difference, the first sending delay parameter, the second sending delay parameter, the first receiving delay parameter, and the second receiving delay parameter;

[0099] The distance calculation unit is used to obtain the distance between the master station and the slave station based on the time interval and value, the first sending delay parameter, the second sending delay parameter, the first receiving delay parameter, and the second receiving delay parameter.

[0100] In some embodiments, in the time difference calculation unit, the calculation formula is expressed as follows:

[0101] dt = [(T1-T2) - (Tt2-Tt1) - (Tr1-Tr2)] / 2; (8)

[0102] Among them, dt represents the time difference between the first starting time and the second starting time, T1-T2 represents the time interval difference, Tt2 represents the second sending delay parameter, Tt1 represents the first sending delay parameter, Tr1 represents the first receiving delay parameter, and Tr2 represents the second receiving delay parameter.

[0103] In some embodiments, in the distance calculation unit, the calculation formula is expressed as follows:

[0104] D=c×τ=c×[(T1 + T2) - (Tt1 + Tt2) - (Tr1 +Tr2)] / 2; (9)

[0105] Wherein, D represents the distance between the master station and the slave station, c represents the speed of light, τ represents the signal propagation delay between the master station and the slave station, T1+T2 represents the time interval and value, Tt1 represents the first sending delay parameter, Tt2 represents the second sending delay parameter, Tr1 represents the first receiving delay parameter, and Tr2 represents the second receiving delay parameter.

[0106] It is worth mentioning that all modules involved in this embodiment are logic modules. In practical applications, a logic unit can be a physical unit, a part of a physical unit, or a combination of multiple physical units. In addition, in order to highlight the innovative part of this application, this embodiment does not introduce units that are not closely related to solving the technical problems proposed by this application, but this does not mean that there are no other units in this embodiment.

[0107] Embodiment five:

[0108] Another embodiment of the present application relates to an electronic device, such as Figure 8 As shown, it includes: at least one processor 801; and a memory 802 that is communicatively connected to the at least one processor 801; wherein the memory 802 stores instructions that can be executed by the at least one processor 801, and the instructions are executed by the at least one processor 801 so that the at least one processor 801 can execute the time synchronization method for microwave bidirectional link measurement in the above-mentioned embodiments.

[0109] Among them, the memory and the processor are connected in a bus manner, and the bus may include any number of interconnected buses and bridges, and the bus connects various circuits of one or more processors and memories together. The bus can also connect various other circuits such as peripherals, voltage regulators, and power management circuits, which are well known in the art and are therefore not further described herein. The bus interface provides an interface between the bus and the transceiver. The transceiver can be one element or multiple elements, such as multiple receivers and transmitters, providing a unit for communicating with various other devices on a transmission medium. The data processed by the processor is transmitted on a wireless medium via an antenna, and further, the antenna also receives data and transmits the data to the processor.

[0110] The processor is responsible for managing the bus and general processing, and can also provide various functions, including timing, peripheral interfaces, voltage regulation, power management, and other control functions. Memory can be used to store data used by the processor when performing operations.

[0111] Embodiment six:

[0112] Another embodiment of the present application relates to a computer-readable storage medium storing a computer program, which implements the above method embodiment when executed by a processor.

[0113] That is, those skilled in the art can understand that all or part of the steps in the above-mentioned embodiment method can be completed by instructing the relevant hardware through a program, and the program is stored in a storage medium, including a number of instructions to enable a device (which can be a single-chip microcomputer, chip, etc.) or a processor to execute all or part of the steps of the method described in each embodiment of the present application. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (Read-Only Memory, referred to as: ROM), random access memory (Random Access Memory, referred to as: RAM), disk or optical disk and other media that can store program codes.

[0114] Those skilled in the art will appreciate that the above embodiments are specific embodiments for implementing the present application, and in actual applications, various changes may be made thereto in form and detail without departing from the spirit and scope of the present application.

Claims

1. A time synchronization method for microwave bidirectional link measurement, characterized in that: include: Construct a bidirectional link measurement model between the master station and the slave station; Obtaining, based on the bidirectional link measurement model, a measurement difference generated after the master station and the slave station measure the same measurement object between each other; Obtaining a clock difference between the clocks of the master station and the slave station based on the measured difference; Time synchronization between the master station and the slave station is completed based on the clock difference.

2. The time synchronization method for microwave bidirectional link measurement according to claim 1, characterized in that: The step of constructing a bidirectional link measurement model between a master station and a slave station includes: Constructing the master test station and the slave test station, wherein the master test station and the slave test station are respectively equipped with a signal transceiver link composed of the same baseband and / or low intermediate frequency module, K frequency conversion module and transceiver integrated antenna; The master station and the slave station transmit and receive signals to each other through their own built-in signal transceiver links, so as to form a bidirectional link measurement model between the master station and the slave station.

3. The time synchronization method for microwave bidirectional link measurement according to claim 1, characterized in that: The obtaining, based on the bidirectional link measurement model, a measurement difference generated after the master station and the slave station measure the same measurement object between each other, comprises: Acquire a first starting time when the master station sends a ranging time signal, and a second starting time when the slave station sends a ranging signal; Acquire a first receiving start time when the master station receives the ranging time signal sent by the slave station at the second starting time, and a second receiving start time when the slave station receives the ranging time signal sent by the master station at the first starting time; Obtain a first time interval based on the first start time and the first receiving start time, and obtain a second time interval based on the second start time and the second receiving start time; A measurement difference value generated after the master station and the slave station measure the same measurement object is obtained based on the first time interval and the second time interval.

4. The time synchronization method for microwave bidirectional link measurement according to claim 3, characterized in that: The method further includes: obtaining, through equipment calibration, a first transmission delay parameter and a first reception delay parameter of the master station, and a second transmission delay parameter and a second reception delay parameter of the slave station, respectively.

5. The time synchronization method for microwave bidirectional link measurement according to claim 4, characterized in that: The obtaining, based on the first time interval and the second time interval, a measurement difference value generated after the master station and the slave station measure the same measurement object, comprises: Calculating a time interval difference and a time interval sum between the first time interval and the second time interval; Obtaining a time difference between the first starting time and the second starting time when the master station and the slave station send signals to each other based on the time interval difference, the first sending delay parameter, the second sending delay parameter, the first receiving delay parameter, and the second receiving delay parameter; The distance between the master station and the slave station is obtained based on the time interval and value, the first sending delay parameter, the second sending delay parameter, the first receiving delay parameter, and the second receiving delay parameter.

6. The time synchronization method for microwave bidirectional link measurement according to claim 5, characterized in that: The time difference between the first starting time and the second starting time when the master station and the slave station send signals to each other is obtained based on the time interval difference, the first sending delay parameter, the second sending delay parameter, the first receiving delay parameter, and the second receiving delay parameter, and the formula is expressed as follows: dt=[(T1-T2)-(Tt2-Tt1)-(Tr1-Tr2)] / 2; Among them, dt represents the time difference between the first starting time and the second starting time, T1-T2 represents the time interval difference, Tt2 represents the second sending delay parameter, Tt1 represents the first sending delay parameter, Tr1 represents the first receiving delay parameter, and Tr2 represents the second receiving delay parameter.

7. The time synchronization method for microwave bidirectional link measurement according to claim 5, characterized in that: The distance between the master station and the slave station is obtained based on the time interval and value, the first sending delay parameter, the second sending delay parameter, the first receiving delay parameter, and the second receiving delay parameter, and its formula is expressed as follows: D=c×τ=c×[(T1+T2)-(Tt1+Tt2)-(Tr1+Tr2)] / 2; Wherein, D represents the distance between the master station and the slave station, c represents the speed of light, τ represents the signal propagation delay between the master station and the slave station, T1+T2 represents the time interval and value, Tt1 represents the first sending delay parameter, Tt2 represents the second sending delay parameter, Tr1 represents the first receiving delay parameter, and Tr2 represents the second receiving delay parameter.

8. A time synchronization device for microwave bidirectional link measurement, characterized in that: include: A measurement model building module is used to build a bidirectional link measurement model between a master station and a slave station; A measurement difference calculation module, configured to obtain, based on the bidirectional link measurement model, a measurement difference generated after the master station and the slave station measure the same measurement object between each other; A clock difference obtaining module, used for obtaining the clock difference between the clocks of the master station and the slave station based on the measured difference; A synchronization implementation module is used to complete the time synchronization between the master station and the slave station based on the clock difference.

9. An electronic device, characterized in that: include: at least one processor; as well as, a memory communicatively connected to the at least one processor; wherein, The memory stores instructions that can be executed by the at least one processor, and the instructions are executed by the at least one processor to enable the at least one processor to perform the time synchronization method for microwave bidirectional link measurement as claimed in any one of claims 1 to 7.

10. A computer-readable storage medium storing a computer program, characterized in that: When the computer program is executed by a processor, the time synchronization method for microwave bidirectional link measurement according to any one of claims 1 to 7 is implemented.

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