CN115085829A

CN115085829A - Method for testing sensitivity under existence of multipath fading interference and electronic equipment

Info

Publication number: CN115085829A
Application number: CN202210543832.2A
Authority: CN
Inventors: 吕继方; 李曼; 蔡发君; 李晶晶; 陈天宇; 张云飞
Original assignee: Jiangsu Ocean University; Zhuhai Yunzhou Intelligence Technology Ltd
Current assignee: Jiangsu Ocean University; Zhuhai Yunzhou Intelligence Technology Ltd
Priority date: 2022-05-18
Filing date: 2022-05-18
Publication date: 2022-09-20
Anticipated expiration: 2042-05-18
Also published as: CN115085829B

Abstract

The invention is suitable for the technical field of signal testing, and provides a method for testing sensitivity under the existence of multipath fading interference and an electronic device, wherein the method comprises the following steps: determining a test parameter of a multipath fading mode based on the water surface environment; collecting error code characteristic information of a multipath fading analog signal; the multipath fading signal comprises a useful signal and a noise signal which are processed by a fading signal simulator corresponding to the multipath fading mode; if the error code characteristic information does not meet the convergence condition of the multipath fading mode, determining an adjusting parameter according to the error code characteristic information, and adjusting the test parameter based on the adjusting parameter; returning and executing the collection of error code characteristic information of the multipath fading simulation signal based on the adjusted test parameters; and if the error code characteristic information meets the convergence condition, determining the sensitivity of the useful signal in the multipath fading mode based on the test parameters corresponding to the convergence condition. The invention solves the problem that the test of sensitivity takes longer under the condition of complex multipath interference.

Description

Method for testing sensitivity under existence of multipath fading interference and electronic equipment

Technical Field

The present invention relates to the field of signal testing technologies, and in particular, to a method and an electronic device for testing sensitivity in the presence of multipath fading interference.

Background

Along with the continuous development of artificial intelligence technology, unmanned application scenarios are increasing, for example, unmanned technology can be applied to unmanned planes, unmanned ships, robots and the like. The unmanned technology depends on the propagation of wireless signals, but the actual working environment of the terminal applying the unmanned technology is complex, for example, the terminal can be influenced by multipath fading in the propagation process, particularly, for the unmanned ship, the terminal can be influenced by multipath fading caused by the environment on the water surface, and also can be influenced by multipath fading caused by complex environments such as reflection and scattering of obstacles passing through the water surface and fixed obstacles on the water surface when the unmanned ship moves, and the signal amplitude, time delay and phase on each propagation path change anytime and anywhere along with the control of the movement of the mobile station of the unmanned ship, so how to measure the complex signals more efficiently and reduce the influence of the complex interference on a receiver have important significance.

At present, in the prior art, in the test in the interference environment, the receiver is accessed by a signal simulation interference signal to measure the sensitivity of a useful signal in the interference environment, and because the interference signal and the useful signal are both multipath fading signals, the fluctuation of the error rate is very large and the convergence is not easy in the sensitivity measurement process, so that the test consumes a long time.

Disclosure of Invention

In view of this, the embodiment of the present invention provides a method for testing sensitivity under the existence of multipath fading interference, so as to solve the problem that in the existing method for measuring sensitivity of a useful signal under the existence of interference environment, because an interference signal and the useful signal are both multipath fading signals, in the process of measuring sensitivity, bit error rate fluctuation is very large and convergence is not easy, which results in long test time.

A first aspect of an embodiment of the present invention provides a method for testing sensitivity in the presence of multipath fading interference, including:

determining a test parameter of a multipath fading mode based on the water surface environment;

collecting error code characteristic information of a multipath fading analog signal; the multipath fading signal comprises a useful signal and a noise signal which are processed by a fading signal simulator corresponding to the multipath fading mode; the useful signal is generated based on the test parameter;

if the error code characteristic information does not meet the convergence condition of the multipath fading mode, determining an adjusting parameter according to the error code characteristic information, and adjusting the test parameter based on the adjusting parameter;

returning and executing the error code characteristic information of the collected multipath fading simulation signal based on the adjusted test parameters;

and if the error code characteristic information meets the convergence condition, determining the sensitivity of the useful signal in the multipath fading mode based on the test parameters corresponding to the convergence condition.

In a possible implementation manner of the first aspect, the test parameters include: signal level and test frame number; the error code characteristic information comprises: mean error rate and standard error rate difference; the adjusting parameters comprise: adjusting step length and adjusting proportion;

the collecting the error code characteristic information of the multipath fading analog signal comprises:

acquiring the real-time error rate of each signal frame in the multipath fading simulation signal; the useful signal in the multipath fading analog signal is generated based on the signal level; the signal duration of the multipath fading simulation signal is determined based on the test frame number;

calculating the bit error rate mean value and the bit error rate standard deviation value based on a plurality of real-time bit error rates matched with the number of the test frames;

if the error code characteristic information does not meet the convergence condition of the multipath fading mode, determining an adjustment parameter according to the error code characteristic information, and adjusting the test parameter based on the adjustment parameter, including:

adjusting the signal level in the test parameter according to the adjustment step length corresponding to the bit error rate mean value; and

and adjusting the test frame number in the test parameters according to the adjustment proportion corresponding to the standard deviation value of the bit error rate.

In a possible implementation manner of the first aspect, the adjusting the signal level in the test parameter according to the adjustment step corresponding to the bit error rate mean value includes:

determining a difference absolute value and an adjusting direction of the adjusting step length according to a difference value between the error rate average value and a preset expected error rate average value;

if the absolute value of the difference is greater than or equal to a preset first threshold, setting the adjustment amplitude of the adjustment step length as a first adjustment amplitude;

if the absolute value of the difference is smaller than the first threshold and not smaller than a preset second threshold, setting the adjustment amplitude of the adjustment step length to be a second adjustment amplitude, wherein the first adjustment amplitude is N times of the second adjustment amplitude; n is a positive number greater than 1; the first threshold is greater than the second threshold;

if the absolute value of the difference is smaller than the second threshold, setting the adjustment amplitude of the adjustment step length as a third adjustment amplitude, wherein the third adjustment amplitude is smaller than the second adjustment amplitude;

adjusting the signal level in the adjustment direction by the adjustment step size.

In a possible implementation manner of the first aspect, the adjusting, according to an adjustment coefficient corresponding to the standard deviation of error rate as an adjustment ratio, the adjusting the number of test frames in the test parameter includes:

if the standard error rate difference value is larger than or equal to a preset first standard difference value, setting the adjustment proportion to be M; m is an integer greater than 1;

if the error rate standard difference value is smaller than the first standard difference value and not smaller than a preset second standard difference value, setting the adjustment ratio to be 1/M; the first standard deviation value is greater than the second standard deviation value;

if the standard deviation value of the error rate is smaller than the second standard deviation value, setting the adjustment proportion to 1/2M;

and adjusting the test frame number based on the adjusting proportion.

In a possible implementation manner of the first aspect, the acquiring a real-time bit error rate of each signal frame in the multipath fading simulation signal includes:

if the error rate of the check bit of any signal frame is detected to be larger than the preset error rate upper limit value, stopping outputting the multipath fading analog signal; the upper error rate limit is determined based on the multipath fading mode;

and re-executing the real-time error rate of each signal frame in the collected multipath fading simulation signal.

In one possible implementation manner of the first aspect, before the determining the test parameters of the multipath fading mode based on the water surface environment, the method further includes:

determining the multipath fading mode according to the water surface environment model to be tested and the moving speed of the unmanned control equipment;

setting the fading signal simulator based on the multipath fading mode;

and generating the noise signal according to the frequency domain information of the useful signal.

In a possible implementation manner of the first aspect, the error code characteristic information further includes: the real-time bit error rate of the last signal frame in the multipath simulated fading signal;

if the error code characteristic information meets the convergence condition, determining the sensitivity of the useful signal in the multipath fading mode based on the test parameter corresponding to the convergence condition, including:

if the real-time error rate of the last signal frame is smaller than a preset expected error rate, identifying that the test parameter meets the convergence condition; the expected bit error rate is determined based on the multipath fading pattern.

A second 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 executable on the processor, where the processor implements the following steps when executing the computer program:

the test parameter acquisition unit is used for determining the test parameters of the multipath fading mode based on the water surface environment;

the error code characteristic information acquisition unit is used for acquiring the error code characteristic information of the multipath fading simulation signal; the multi-path fading signal comprises a useful signal and a noise signal which are processed by a fading signal simulator corresponding to the multi-path fading mode; the useful signal is generated based on the test parameter;

a test parameter adjusting unit, configured to determine an adjustment parameter according to the error code characteristic information if the error code characteristic information does not satisfy the convergence condition of the multipath fading mode, and adjust the test parameter based on the adjustment parameter;

the error code characteristic information return acquisition unit is used for returning and executing the error code characteristic information of the multipath fading simulation signal acquisition based on the adjusted test parameters;

and the sensitivity deriving unit is used for determining the sensitivity of the useful signal in the multipath fading mode based on the test parameters corresponding to the convergence condition if the error code characteristic information meets the convergence condition.

A third aspect of embodiments of the present invention provides a terminal device, which includes a memory, a processor, and a computer program stored in the memory and executable on the processor, and the processor implements the steps of the first aspect when executing the computer program.

A fourth aspect of an embodiment of the present invention provides a sensitivity testing system, including:

a base station, at least two fading signal simulators and a terminal device as described in the third aspect.

A fourth aspect of embodiments of the present invention provides a computer-readable storage medium storing a computer program which, when executed by a processor, performs the steps of the first aspect.

The implementation of the method for testing the sensitivity under the existence of the multipath fading interference provided by the embodiment of the invention has the following beneficial effects:

the embodiment of the invention determines an initial test parameter corresponding to a multipath fading mode to be tested when sensitivity test is carried out, then acquires error code characteristic information of the multipath fading simulation signal corresponding to the fading simulation signal, dynamically determines an adjusting parameter through the error code characteristic information when the error code characteristic information is detected not to meet a convergence condition, adjusts the test parameter in the last test process through the adjusting parameter until the error code characteristic information meets the convergence condition, terminates the test and determines the sensitivity corresponding to a useful signal in the multipath fading mode to be tested according to the test parameter when the convergence condition is met. Compared with the existing testing method under the existence of multipath fading interference, the method dynamically adjusts the testing parameters through different error rate information, namely the adjusting parameters in the adjusting process are not fixed and can determine proper adjusting amplitude according to the error rate information, so that the rapid convergence of the testing process can be realized, the testing parameters meeting the convergence conditions corresponding to the multipath fading mode are rapidly determined, the sensitivity is determined according to the testing parameters meeting the convergence conditions, the time consumption and the duration of sensitivity testing are reduced, and the testing efficiency is improved.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.

FIG. 1 is a schematic flow chart of a sensitivity testing system provided by an embodiment of the present invention;

FIG. 2 is a flow chart of an implementation of the sensitivity testing method according to the first embodiment of the present invention;

fig. 3 is a flowchart illustrating an implementation of a sensitivity testing method S103 according to a second embodiment of the present invention;

fig. 4 is a flowchart illustrating a detailed implementation of a sensitivity testing method S1033 according to a third embodiment of the present invention;

FIG. 5 is a flowchart illustrating an implementation of a sensitivity testing method S1034 according to a fourth embodiment of the present invention;

fig. 6 is a flowchart of a specific implementation of a sensitivity testing method S1031 according to a fifth embodiment of the present invention;

fig. 7 is a flowchart illustrating an implementation of a method for determining test parameters of a multipath fading pattern based on a water surface environment according to an embodiment of the present invention;

FIG. 8 is a block diagram of a sensitive test terminal according to an embodiment of the present invention;

fig. 9 is a schematic diagram of a terminal device according to another embodiment of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

It will be understood that the terms "comprises" and/or "comprising," when used in this specification and the appended claims, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.

It should also be understood that the term "and/or" as used in this specification and the appended claims refers to and includes any and all possible combinations of one or more of the associated listed items.

Furthermore, in the description of the present application and the appended claims, the terms "first," "second," "third," and the like are used for distinguishing between descriptions and not necessarily for describing or implying relative importance.

Reference throughout this specification to "one embodiment" or "some embodiments," or the like, means that a particular feature, structure, or characteristic described in connection with the embodiment is included in one or more embodiments of the present application. Thus, appearances of the phrases "in one embodiment," "in some embodiments," "in other embodiments," or the like, in various places throughout this specification are not necessarily all referring to the same embodiment, but rather "one or more but not all embodiments" unless specifically stated otherwise. The terms "comprising," "including," "having," and variations thereof mean "including, but not limited to," unless expressly specified otherwise.

In the embodiment of the invention, the execution main body of the process is terminal equipment with sensitivity testing capability, the terminal equipment comprises the terminal equipment with sensitivity testing capability such as a server, computer equipment and the like, and proper testing parameters are automatically adjusted through error code characteristic information, so that the error code characteristic information meets the convergence condition of the current multipath fading mode. By way of example, fig. 1 shows a schematic structural diagram of a sensitivity testing system provided in the present application, and by way of example and not limitation, refer to fig. 1, and the following is detailed specifically:

the test system comprises: the base station 101, the comprehensive tester 201, the combiner 401, at least two fading

signal simulators

301 and 302, and the terminal device 501, it is understood that the terminal device may be a portable computer, a PDA, etc.

The signal output end of the base station 101 is connected to the signal input end of the comprehensive tester 201, the signal output end of the comprehensive tester 201 is connected to the input ends of the fading signal simulator 301, the fading signal simulator 302 and the terminal device 501, the output end of the terminal device 501 is connected to the input end of the comprehensive tester 201, the output ends of the fading signal simulator 301 and the fading signal simulator 302 are connected to the input end of the combiner 401, and the output end of the combiner 401 is connected to the input end of the base station 101.

Before testing the sensitivity under the existence of the multipath fading interference, the integrated tester 201 and the base station 101 synchronize clock signals and frame signals, the fading signal simulator 301 and the fading signal simulator 302 respectively synchronize the clock signals and the frame signals with the integrated tester 201, after the synchronization is finished, the base station 101 sends useful signals to be tested to the integrated tester 201, the integrated tester 201 receives the useful signals and sends the useful signals to the fading signal simulator 301, the fading signal simulator 301 outputs the multipath fading useful signals (i.e. signals obtained by the useful signals after the multipath fading simulation), and transmits the multipath fading useful signals to one input end of the combiner 401, meanwhile, the fading signal simulator 302 outputs the multipath fading interference signals and transmits the multipath fading interference signals to the other input end of the combiner 401, the combiner 401 combines the multipath fading useful signals and the multipath fading interference signals, obtaining a multipath fading signal, thereby realizing the simulation of a signal actually received by the unmanned equipment when the unmanned equipment moves in a corresponding scene; after obtaining the multipath fading signal, the combiner 401 transmits the multipath fading signal to the base station 101, the base station 101 sends the multipath fading signal to the comprehensive tester 201, the comprehensive tester 201 restores a useful signal based on the multipath fading signal, obtains error code characteristic information of the useful signal in the whole transmission process, and outputs the error code characteristic information to the terminal device 501, and the terminal device performs the sensitivity test process provided by this embodiment according to the error code characteristic information.

Fig. 2 shows a flowchart of an implementation of the method for testing sensitivity in the presence of multipath fading interference according to the first embodiment of the present invention, which is detailed as follows:

in S101, test parameters of a multipath fading pattern are determined based on the water surface environment.

In this embodiment, all multipath fading patterns included in the drone may be determined according to the operational scenario of the drone. Any of the multipath fading patterns in the operational scenarios described above may be defined by a number of different scenario dimensions. Illustratively, the scene dimensions may include: external environment information on which the unmanned aerial vehicle operates, a movement speed range of the unmanned aerial vehicle, and the like. The method can be used for carrying out permutation and combination according to the value ranges of different scene dimensions, determining all multipath fading modes operated by the unmanned equipment, and configuring corresponding test identifiers for different multipath fading modes. The multipath fading modes of which the sensitivities have not been tested yet can be determined according to the values of the test identifiers of the multipath fading modes, one of the multipath fading modes is selected as the multipath fading mode to be tested, and the steps from S101 to S104 are executed.

In this embodiment, different multipath fading patterns may correspond to the same initial test parameters, or may correspond to different initial test parameters. In an automatic test scenario, the terminal device may determine the test parameters of the multipath fading mode to be tested by using corresponding means according to the initial test parameters and the corresponding mode between the multipath fading modes. For example, if all the multipath fading modes correspond to the same test parameters, the terminal device may obtain a default value, and set the test parameters of the multipath fading mode to be tested based on the mode value. It should be noted that the test parameters are initial values when performing sensitivity test, and may be adjusted according to adjustment parameters determined by error code characteristic information in a subsequent test process.

In one possible implementation, the multipath fading pattern may be determined by means of user settings. In this case, the terminal device may generate a setting interface of the multipath fading mode, where the setting interface may include one or more configuration items, for example, each configuration item may correspond to one of the scene dimensions, a user may input corresponding configuration information in the configuration items, and the terminal device may determine a multipath fading mode according to the configuration information corresponding to all the configuration items.

In this embodiment, the test parameter includes at least one test parameter to be output, and the test parameter is specifically a test parameter capable of directly or indirectly influencing the sensitivity of the test useful signal. The test parameters may be, for example, the waveform, level, and frame number of the desired signal.

In a possible implementation manner, the terminal device may store a correspondence table between the test parameters and the multipath fading modes, and the correspondence table records different multipath fading modes and corresponding test parameters. When the terminal device needs to determine the sensitivity of a useful signal in a certain multipath fading mode, the test parameters associated with the mode identifier of the multipath fading mode to be tested can be determined by querying the correspondence table, that is, the test parameters are used in the S101.

In a possible implementation manner, the terminal device may further be provided with a conversion model of test parameters, and parameters such as an environment type and related operation parameters of only the unmanned device, which are associated with the multipath fading mode to be tested, and device factors are imported into the conversion model, so that corresponding test parameters can be obtained through calculation.

In S102, collecting error code characteristic information of the multipath fading analog signal; the multipath fading signal comprises a useful signal and a noise signal which are processed by a fading signal simulator corresponding to the multipath fading mode; the useful signal is generated based on the test parameter.

In this embodiment, the sensitivity testing system includes at least two fading signal simulators, where the two fading signal simulators are configured according to the multipath fading mode of the current test, so as to implement the fading condition of the signal in the scene corresponding to the multipath fading mode. One fading signal simulator is used for receiving the useful signal sent by the comprehensive tester, multipath fading simulation is carried out on the useful signal in the current multipath fading mode to obtain a multipath fading useful signal, and the other fading signal simulator is used for carrying out multipath fading simulation on environmental noise in the current multipath fading mode to obtain a multipath fading noise signal.

In this embodiment, the error code characteristic information is obtained based on two signals, namely, a useful signal and a multipath fading signal, sent by the base station to the integrated instrument, the integrated instrument obtains the useful signal by comparing the multipath fading interference signal with the multipath fading signal generated by the combiner, and compares the useful signal obtained by reduction with the useful signal sent by the base station to obtain the number of characters of each frame error of the useful signal after the multipath fading interference in the current test environment, thereby calculating the error code rate of the corresponding frame, and determining the error code characteristic information based on the error code rate of each frame.

In this embodiment, before testing the sensitivity of signals under multipath fading interference, the fading options of the two fading signal simulators may be set to a closed state, in the closed state, the fading signal simulators do not perform fading processing on the input signals, but directly perform signal transmission, then start to test the static sensitivity of the frequency points used by the useful signals, determine whether the static sensitivity reaches an expected sensitivity threshold, and if so, start to test the sensitivity of the signals under multipath fading interference. The frequency point of the interference signal can be flexibly set to be the frequency point of the multipath fading useful signal with the same frequency or at intervals of a preset frequency range, and the expected level of the static sensitivity can be obtained by calculating the thermal noise, the bandwidth, the noise coefficient and the demodulation threshold.

In this embodiment, in the sensitivity test process, the useful signal generated for the first time is obtained by determining the test parameter configuration of the multipath fading mode based on the water surface environment. Specifically, the test parameters include an initial level of the useful signal and an initial test frame number, the initial level is used for determining the signal amplitude of the useful signal, and the initial test frame number is used for determining the signal length of the useful signal.

In a possible implementation manner, the initial level may be obtained by the expected sensitivity threshold of the static sensitivity and the fading factor corresponding to the multipath fading mode to be tested, or may be obtained by reading the received signal strength indication value under the current interference from the background after the fading signal simulator is started. The initial test frame number can be preset by the user according to experience, and can also be determined by storing a corresponding relation table between the test parameters and the multipath fading mode.

In this embodiment, because the environment of wireless signal propagation on the water surface is very complex, in the process of propagation, multiple moving obstacles and fixed obstacles are involved, multipath fading of complex environments such as reflection and scattering is generated on the transmitted wireless signal, and due to the influence of environmental noise, the transmitted wireless signal will have signal attenuation to a certain extent and crosstalk of noise signals, thereby causing a part of character recognition errors in the process of signal transmission.

In S103, if the error code characteristic information does not satisfy the convergence condition of the multipath fading mode, determining an adjustment parameter according to the error code characteristic information, and adjusting the test parameter based on the adjustment parameter.

In this embodiment, since both the useful signal and the noise signal in the fading simulation signal are signals obtained after being processed by the fading signal simulator, and are used for simulating interference effects such as multiple reflections, scattering, and the like that may exist in an actual scene, in general, the error rate of the fading simulation signal fluctuates greatly, and the error code characteristic information obtained in this case is determined to not satisfy the convergence condition, and the operation of S103 is performed. For example, the convergence condition may be a desired value range, and the error characteristic information includes an error rate corresponding to each frame of the useful signal, in this case, if the terminal device detects that the error rate of any frame of the useful signal is outside the desired value range, the terminal device recognizes that the error characteristic information does not satisfy the convergence condition, and needs to make the error rate converge by adjusting the test parameter.

In this embodiment, the terminal device may perform multiple kinds of processing on the error code characteristic information, and each processing result corresponds to adjustment of one test parameter. Optionally, the average number, the mode and the median of the error rate may be calculated, and the adjustment parameter of the useful signal level is obtained through a functional relation for the three data, so that the useful signal is adjusted to a more appropriate level amplitude, and the sensitivity of the useful signal under the multipath fading interference of the current environment is obtained within a preset error rate expected range. In addition, optionally, the range and the variance of the bit error rate can be calculated, and the adjustment parameters of the useful signal test frame number are obtained through the functional relation of the two data, so that the useful signal is adjusted to a more appropriate test frame number, the problem that the bit error rate is difficult to converge due to too few test frame numbers is avoided, and the problem that the test time is too long due to too long test frame numbers is also avoided.

In this embodiment, the terminal device may store a corresponding relationship table between the error code characteristic information convergence range and the multipath fading mode, where the corresponding relationship table records different multipath fading modes and their corresponding convergence ranges of the error code characteristic information, and when the error code characteristic information is not in the convergence range of the current multipath fading mode, determine a required adjustment parameter according to a relationship between the error code characteristic information and a set parameter in the corresponding relationship table, and adjust a test parameter that we need to adjust according to the adjustment parameter.

In a possible implementation manner, in addition to determining the adjustment parameter through the correspondence table, the terminal device may also import the error code characteristic information into a preset conversion function between the error code rate and the adjustment parameter, calculate the adjustment parameter corresponding to the current testing process, and then adjust the testing parameter in the last testing process through the adjustment parameter.

In this embodiment, the adjustment parameter is dynamically adjusted according to the error code characteristic information obtained by each test, that is, the adjustment parameter is not a fixed value, but an appropriate value is selected according to the difference of the error code characteristic information to determine the adjustment amplitude of the test parameter. The error code characteristic information can be used for representing the signal quality in the communication process, the smaller the adjustment amplitude is when the signal quality is better, and the larger the adjustment amplitude is when the signal quality is worse, for example, if the error code characteristic information has a larger deviation from an expected value, the adjustment amplitude of the test parameter can be increased, so that the communication quality of the useful signal in a multipath fading scene can be quickly improved, the convergence of the test result is achieved, and the convergence condition is met.

And in S104, returning and executing the error code characteristic information of the collected multipath fading simulation signal based on the adjusted test parameters.

In this embodiment, after the test parameters are adjusted, the terminal device may re-execute the test procedure once, that is, re-return to the step of acquiring the error code characteristic information of the multipath fading simulation signal until the error code characteristic information meets the convergence condition. And generating useful signals in the re-executed test flow according to the adjusted test parameters.

For example, in the first test, the signal level in the initial test parameter is-100 dBm, and it is detected that the error code characteristic information of the useful signal output based on-100 dBm does not satisfy the convergence condition, and the adjustment parameter determined based on the error code characteristic information is +5dB, the terminal device may determine that the adjusted signal level is-95 dBm, and generate the corresponding useful signal again based on the adjusted signal level (-95dBm), and calculate the error code characteristic information obtained under the useful signal based on-95 dBm, and so on until the error code characteristic information satisfies the convergence condition.

In S105, if the error code characteristic information satisfies the convergence condition, determining the sensitivity of the useful signal in the multipath fading mode based on the test parameter corresponding to the convergence condition.

In this embodiment, the purpose of adjusting the test parameter is to reduce the dispersion degree of the error code characteristic information, and if the error code characteristic information satisfies the convergence condition, it indicates that the current test parameter has been adjusted to an appropriate value, at this time, the adjustment of the test parameter is ended, and the useful signal sensitivity of the test parameter is output.

In this embodiment, the sensitivity of the useful signal is obtained based on the error code characteristic information, and in a possible implementation manner, a sensitivity formula relating sensitivity to the error code characteristic information such as a noise coefficient, a signal bandwidth, a demodulation signal-to-noise ratio, and the like may be set, and the sensitivity may be calculated from the error code characteristic information.

Further, as another embodiment of the present application, if the error code characteristic information includes a real-time error rate of a last signal frame in the multipath simulated fading signal, the S105 may specifically include S1051, which is specifically described as follows:

in S1051, if the real-time error rate of the last signal frame is less than a preset expected error rate, identifying that the test parameter satisfies the convergence condition; the expected bit error rate is determined based on the multipath fading pattern.

In this embodiment, the error code characteristic information includes a real-time error rate of a last signal frame, in this case, if a useful signal can be transmitted to complete the last signal frame, it indicates that the error rate of the useful signal is in a relatively stable state in the whole test process, and at this time, if the last signal frame meets a preset convergence condition (i.e., the error rate is smaller than the preset expected error rate), it indicates that the test result is converged, and the sensitivity of the signal in the multipath fading mode can be calculated according to the current test parameters. The expected error rate is determined based on the multipath fading mode, and the requirements for sensitivity are different in different multipath fading modes, so that the preset expected error rates of the real-time error rates of the corresponding last signal frame are different, and optionally, the terminal device prestores the expected error rates corresponding to different multipath fading modes.

In a possible implementation mode, whether the real-time error rate of any signal frame is smaller than the error rate upper limit value or not is detected, if the real-time error rate of any signal frame is smaller than the rain error rate upper limit value and the real-time error rate of the last signal frame is smaller than the preset expected error rate corresponding to the current multipath fading mode, the error rate fluctuation is smaller under the current test parameters, and the convergence condition is met, so that the sensitivity of a useful signal under the current multipath fading mode can be determined.

The terminal equipment determines the current multipath fading mode of the unmanned equipment according to the operation scene of the unmanned equipment, determines the initial test parameters through the multipath fading mode to be tested, presets the initial test parameters in a more reasonable range, reduces the cycle times of adjusting the test parameters, measures the error code characteristic information of the corresponding multipath fading signals based on the test parameters, represents the signal quality of the communication process, and accordingly determines the adjustment amplitude of the test parameters. Furthermore, the above processes can be processed by the background of the terminal device, so that automatic adjustment of the test parameters is realized, and the error code characteristic information meets the convergence condition of the current multipath fading mode.

Fig. 3 shows a schematic flowchart of a method for testing sensitivity in the presence of multipath fading interference S103 provided by the present application, by way of example and not limitation, referring to fig. 3, and with respect to the embodiment described in fig. 2, the method for testing sensitivity in the presence of multipath fading interference provided by the present embodiment includes S1031 to S1034, which are detailed as follows:

further, the test parameters include: signal level and test frame number; the error code characteristic information comprises: mean error rate and standard error rate difference; the adjusting parameters comprise: adjusting step length and adjusting proportion;

in S1031, acquiring a real-time bit error rate of each signal frame in the multipath fading simulation signal; the useful signal in the multipath fading analog signal is generated based on the signal level; the signal duration of the multipath fading analog signal is determined based on the number of test frames.

In this embodiment, when testing the sensitivity of a useful signal in a multipath fading mode, a certain testing duration is required to ensure that the bit error rate is in a stable state, and the accuracy of the sensitivity is improved. Based on this, the terminal device may determine the test duration by the number of test frames in the test parameters, that is, in a test period, the useful signal includes a plurality of signal frames, the frame length of each signal frame is the same, and after receiving a signal frame, the terminal device may determine the error rate corresponding to the signal frame in real time, that is, the real-time error rate is obtained.

In this embodiment, the signal amplitude of the useful signal is determined from the signal level in the test parameter. If the value of the signal level is larger, it indicates that the energy carried in the useful signal is larger, and the corresponding signal amplitude is larger. In order to determine the sensitivity of the useful signal in the multipath fading mode to be tested, that is, to determine the minimum level of the useful signal that can transmit the carried information without being interfered by noise, the terminal device may determine the corresponding initial level, that is, the signal level in the test parameter, according to the noise level in the multipath fading mode, and generate the useful signal with the signal level to determine whether the initial level is accurate, and determine the standard instantaneous error rate that can transmit the carried information, so that the terminal device may determine the real-time error rate corresponding to each signal frame.

In S1032, the bit error rate mean value and the bit error rate standard deviation value are calculated based on a plurality of the real-time bit error rates matched with the number of the test frames.

In this embodiment, after determining the real-time error rates corresponding to all signal frames, the terminal device may calculate an error rate mean value and an error rate standard deviation according to all the actual error rates, where the number of the real-time error rates is the number of the test frames set in the test parameter. Specifically, the terminal device may determine an average level of the bit error rate of the useful signal in the test period through the calculated bit error rate average value, where the average level of the bit error rate is mainly related to a signal level of the useful signal, and the signal amplitude of the useful signal is reduced after multipath fading, so that an error code is easily caused by crosstalk of environmental noise. Therefore, the average value of the error rates is calculated through the terminal equipment, and the amplitude and the direction of the test level required to be adjusted can be fed back.

Similarly, the standard error rate difference is calculated to reflect the dispersion degree of the total error rate, namely the convergence condition of the error rate, if the dispersion degree is higher, the communication state of the useful signal is unstable, and the testing time length needs to be prolonged; on the contrary, if the discrete degree is lower, the test duration can be properly shortened, so the terminal equipment can adjust the standard deviation of the error rate by adjusting the test frame number, thereby leading the error code characteristic information to tend to an expected value, namely meeting the convergence condition.

Correspondingly, if the error code characteristic information does not satisfy the convergence condition of the multipath fading mode, determining an adjustment parameter according to the error code characteristic information, and adjusting the test parameter based on the adjustment parameter includes:

in S1033, adjusting the signal level in the test parameter according to the adjustment step corresponding to the bit error rate mean value; and

in S1034, the test frame number in the test parameter is adjusted according to the adjustment ratio corresponding to the standard deviation of the bit error rate.

In this embodiment, when the bit error rate does not satisfy the convergence condition, it indicates that there is a certain difference between the bit error rate and an expected value, and the test parameter at this time cannot reflect the sensitivity of the useful signal in the multipath fading mode, and the test parameter needs to be adjusted, where the content of the adjustment includes two aspects, one is to adjust the signal level in the test parameter, and the other is to adjust the number of test frames in the test parameter (for adjusting the duration of each test period to improve the convergence speed of the test result).

In the embodiment, the corresponding adjustment step length is determined according to the mean value of the error rate, when the mean value of the error rate is larger, the fact that the current test signal level is smaller is reflected, and the positive correlation adjustment step length needs to be set, so that the adjusted signal level is increased; similarly, when the mean value of the error rate is small, it is indicated that the current test signal level is large, and a negative correlation adjustment step length needs to be set, so that the adjusted signal level is reduced.

In the embodiment, a corresponding adjustment proportion is set according to the standard error rate difference, when the standard error rate difference is larger, the fact that the number of the current test signal frames is smaller is reflected, an adjustment proportion larger than one needs to be set, and the number of the adjusted test frames is increased; similarly, when the standard deviation of the error rate is small, it is indicated that the number of the current test signal frames is large, and an adjustment proportion smaller than one needs to be set, so that the number of the adjusted test frames is reduced.

It can be seen from the above that, the invention calculates the mean error rate and the standard error rate difference by collecting the error code characteristic information of the multipath fading analog signal, and adjusts the test level and the test frame number of the useful signal based on the mean error rate and the standard error rate difference. Therefore, the test level and the test frame number can be automatically adjusted, and the automatic adjustment of the test terminal is realized.

Fig. 4 shows a schematic flowchart of a method for testing sensitivity in the presence of multipath fading interference S1033 provided by the present application, by way of example and not limitation, referring to fig. 4, with respect to the embodiment described in fig. 3, in the method for testing sensitivity in the presence of multipath fading interference S1033 provided by this embodiment includes S10331 to S10335, which is described in detail as follows:

further, the adjusting the signal level in the test parameter according to the adjustment step corresponding to the ber average value includes:

in S10331, an absolute value of the difference and an adjustment direction of the adjustment step length are determined according to a difference between the average error rate and a preset expected average error rate.

In this embodiment, the preset expected average error rate is used to represent the error code level meeting the sensitivity test requirement in the current multipath fading mode. The terminal equipment can determine the expected bit error rate mean value corresponding to different multipath fading modes through a protocol, and can also determine the expected bit error rate mean value through a mode set by a user. After the terminal device calculates the difference between the average error rate and the preset expected average error rate, the corresponding adjustment parameter can be determined according to the difference. The adjustment parameter includes two aspects, one is the amplitude of the adjustment, and the other is the direction of the adjustment.

In this embodiment, if the absolute value of the difference between the average error rate and the preset expected average error rate is larger, the difference between the level indicating the error rate and the expected error rate level is larger, and the signal level needs to be adjusted greatly, that is, the amplitude of the adjustment required by the useful signal level is larger, and similarly, the smaller the absolute value of the difference is, the smaller the amplitude of the adjustment required by the useful signal level is reflected.

When the difference is a positive number, it indicates that the actual bit error rate level is greater than the expected bit error rate level, and at this time, it may be caused by insufficient signal energy, so that it is necessary to increase the signal energy, i.e. increase the signal level of the useful signal. If the adjustment direction is positive, the signal level is increased; the adjustment direction is negative, the signal level is decreased.

In S10332, if the absolute value of the difference is greater than or equal to a preset first threshold, setting an adjustment range of the adjustment step size as a first adjustment range.

In this embodiment, the terminal device may set a plurality of thresholds related to the difference, such as the above-mentioned first threshold and the below-mentioned second threshold, to divide the deviation range into a plurality of different intervals, where the different intervals correspond to different adjustment amplitudes, so as to achieve the purpose of calculating the adjustment amplitude in a refined manner. Wherein the first threshold value is a larger value than the second threshold value. If the difference is greater than the first threshold, it indicates that the error rate level is more deviated from the expected error rate level, and at this time, the adjustment range may be set to the first adjustment range.

In a possible implementation manner, the first threshold and the first adjustment amplitude may be determined according to a protocol corresponding to the multipath fading mode, and may be set according to a test experience of a user.

In S10333, if the absolute value of the difference is smaller than the first threshold and not smaller than a preset second threshold, setting an adjustment range of the adjustment step to be a second adjustment range, where the first adjustment range is N times the second adjustment range; n is a positive number greater than 1; the first threshold is greater than the second threshold.

In this embodiment, the second threshold may be determined according to a protocol corresponding to the multipath fading mode, and may be set according to a test experience of a user. And if the difference value between the mean error rate value and the preset expected mean error rate value is smaller than a first threshold value and not smaller than a second threshold value, setting the adjustment amplitude of the adjustment step length as a second adjustment amplitude. Specifically, the first adjustment range should be N times the second adjustment range, where N is a positive number greater than 1. For example, if N is a positive number of 2, the first adjustment amplitude is twice the second adjustment amplitude. In comparison with S10332, since the difference is not larger than the first threshold, i.e. the deviation between the actual ber level and the expected ber level is at a moderate deviation degree, the adjustment amplitude is smaller than the first adjustment amplitude, i.e. 1/N of the first adjustment amplitude.

In S10334, if the absolute value of the difference is smaller than the second threshold, setting an adjustment width of the adjustment step as a third adjustment width, where the third adjustment width is smaller than the second adjustment width.

In this embodiment, the third threshold may be determined according to a protocol corresponding to a multipath fading mode, and may be set according to a test experience of a user; it should be noted that the third adjustment range is smaller than the second adjustment range, and if the difference between the bit error rate average value and the preset expected bit error rate average value is smaller than the second threshold, the adjustment range of the adjustment step length is set to be the third adjustment range. Compared with S10333, since the difference is smaller than the second threshold, that is, the actual ber level is already closer to the expected ber level, at this time, only fine adjustment is needed, so that the adjustment range can be reduced again.

In S10335, the signal level is adjusted in the adjustment direction by the adjustment step size.

In the present embodiment, the adjustment direction is determined based on S10331, the adjustment step size is determined based on any one of S10332, S10333, and S10334, and the useful signal level is adjusted after combining the two.

Exemplarily, a difference between the bit error rate average value and a preset expected bit error rate average value is denoted as X1, a first threshold value is denoted as T1, a second threshold value is denoted as T2, a first adjustment amplitude is denoted as Step1, a second adjustment amplitude is denoted as Step2, a third adjustment amplitude is denoted as Step3, an initial signal level is L1, and an adjusted signal level is L2, the above process may be represented as:

if X1 > T1 and X1 is positive (i.e., the adjustment direction is positive), then L2 is L1+ Step 1;

if T2 ≦ X1 | < T2 and X1 is positive, then L2 ═ L1+ Step2 ═ L1+ Step 1/N;

if T2 > X1I and X1 is positive, L2 is L1+ Step3, wherein Step3 < Step 2;

if X1 > T1 and X1 is negative (i.e., the adjustment direction is negative), then L2 — L1-Step 1;

if T2 ≦ X1 | < T2 and X1 is negative, then L2 ═ L1-Step2 ═ L1-Step 1/N;

if T2 > X1I and X1 is negative, L2 is L1-Step3, wherein Step3 < Step 2.

The difference value between the bit error rate average value and the preset expected bit error rate average value is calculated and compared with the preset first threshold value and the preset second threshold value, the adjustment amplitude and the adjustment direction of the useful signal level are determined, the useful signal level is adjusted, the useful signal level can be adjusted to be close to the minimum received signal level which can be received by a receiver under the condition that the useful signal level meets the index requirement in a short time, and the test time is shortened.

Fig. 5 shows a schematic flowchart of a method for testing sensitivity in the presence of multipath fading interference S1034 provided in the present application, by way of example and not limitation, referring to fig. 5, and with respect to the embodiment described in fig. 3, in the method for testing sensitivity in the presence of multipath fading interference S1034 provided in this embodiment, including S10341 to S10344, detailed descriptions are as follows:

further, the adjusting the number of the test frames in the test parameters according to the adjustment factor corresponding to the standard deviation value of the bit error rate as an adjustment ratio includes:

in S10341, if the error rate standard difference is greater than or equal to a preset first standard difference, setting the adjustment ratio to M; and M is a positive number greater than 1.

In this embodiment, the first standard deviation value may be determined according to a protocol corresponding to a multipath fading mode, and may be set according to a test experience of a user; if the standard deviation of the error rate is larger than or equal to a preset first standard deviation value, the current error rate discrete degree is large, the discrete degree needs to be reduced, and the test frame number of the useful signal is increased by setting an adjusting proportion. Specifically, the adjustment ratio is set to M, where M is an integer greater than 1. For example, if M is a positive number of 2, the number of test frames after adjustment is twice that before adjustment.

In S10342, if the error rate standard deviation value is smaller than the first standard deviation value and not smaller than a preset second standard deviation value, setting the adjustment ratio to be 1/M; the first standard deviation value is greater than the second standard deviation value.

In this embodiment, the second standard deviation value may be determined according to a protocol corresponding to a multipath fading mode, and may be set according to a test experience of a user; it should be noted that the second standard deviation value is smaller than the first standard deviation value. If the standard deviation value of the error rate is smaller than the first standard deviation value and not smaller than the second standard deviation value, the current error rate discrete degree is smaller, the test frame number can be reduced in a smaller range, and the test frame number of the useful signal is reduced by setting the adjusting proportion. Specifically, the adjustment ratio is set to 1/M, wherein M is an integer greater than 1. For example, if M is a positive number of 2, the number of test frames after adjustment is one-half of the number before adjustment.

In S10343, if the standard deviation of the bit error rate is smaller than the second standard deviation, the adjustment ratio is set to 1/2M.

In this embodiment, if the standard error rate difference is smaller than the second standard error rate, it indicates that the current error rate dispersion degree is small, and the number of test frames can be greatly reduced, and the number of test frames of useful signals can be reduced by setting the adjustment ratio. Specifically, the adjustment ratio is set to 1/2M, where M is an integer greater than 1. For example, if M is a positive number of 2, the number of test frames after adjustment is one fourth of the number before adjustment.

In S10344, the test frame number is adjusted based on the adjustment ratio.

In this embodiment, in any one of the above S10341 to S10343, based on a magnitude relationship between the standard deviation value of the bit error rate and the set first standard deviation value and second standard deviation value, it is determined whether the current test frame number is too large or too small, so as to determine the above adjustment ratio and adjust the test frame number.

Illustratively, if the standard deviation of the bit error rate is Eb, the first standard deviation is D1, the second standard deviation is D2, the adjustment ratio is K, the initial number of test frames is F1, and the adjusted number of test frames is F2, the process may be represented as:

if Eb is larger than or equal to D1, and the adjustment proportion K is equal to M (M is a positive number larger than 1), F2 is equal to K multiplied by F1;

if D2 is less than or equal to Eb < D1 and the adjustment ratio K is 1/M (M is a positive number greater than 1), F2 is K multiplied by F1;

if Eb < D2 and the adjustment ratio K is 1/2M (M is a positive number greater than 1), F2 is K × F1.

Therefore, the method can adjust the useful signal test frame number by calculating the standard error rate difference value and comparing the standard error rate difference value with the preset first standard difference value and the second standard difference value, can adjust the useful signal test frame number to a proper value in a short time, and improves the accuracy and the efficiency of the test.

Fig. 6 shows a schematic flowchart of a method for testing sensitivity S1031 under existence of multipath fading interference provided by the present application, for example and without limitation, referring to fig. 6, and with respect to the embodiment described in fig. 3, the method for testing sensitivity S1031 under existence of multipath fading interference provided by the present embodiment specifically includes S10311 to S10312, which are specifically detailed as follows:

further, the acquiring a real-time bit error rate of each signal frame in the multipath fading simulation signal includes:

in S10311, if it is detected that the check bit error rate of any one of the signal frames is greater than the preset error rate upper limit value, stopping outputting the multipath fading analog signal; the upper error rate limit is determined based on the multipath fading pattern.

In this embodiment, in a test environment, there may be abnormal situations such as equipment jitter or voltage instability, so that the bit error rate is greatly improved, that is, there is unexpected interference, so that a deviation occurs in a test result, a sensitivity test is affected, and a test is inaccurate. Therefore, in order to solve the above-mentioned situation affecting the sensitivity test, an upper limit value of the error rate may be set to detect whether the above-mentioned abnormal situation exists. The preset upper limit of the bit error rate may be determined based on a currently set multipath fading mode. The communication quality of the current time can be determined by identifying the number of character errors in the check bits in the signal frames, so that when the error rate of the check bits of any signal frame is greater than the preset upper limit value of the error rate, the unexpected interference is caused, the test result is deviated, the error code information of the round is inaccurate, the output of the multipath fading simulation signal is stopped at the moment, and the influence of the inaccurate error code information on the test result is removed.

In S10312, the acquiring of the real-time bit error rate of each signal frame in the multipath fading simulation signal is performed again.

In this embodiment, because the output of the multipath fading simulation signal with inaccurate test is stopped in the above S10311, the multipath fading simulation signal needs to be retested to acquire the real-time bit error rate of each signal frame of the multipath fading simulation signal.

It can be seen from the above that, the invention monitors the check bit error rate of each signal frame in the multipath fading simulation signal, and finds the check bit error rate of the signal frame larger than the upper limit value of the preset error rate in time, thereby terminating the test of the round and carrying out a new round of test, avoiding the influence of unexpected interference on the sensitivity test, improving the accuracy of the test, and reducing the test time because of the timely termination of the test.

Fig. 7 shows a schematic flowchart of a method for testing sensitivity in the presence of multipath fading interference provided by the present application, for example and without limitation, refer to fig. 7, and further includes S201 to S202 before S101, which are detailed as follows:

in S201, the multipath fading mode is determined according to the model of the water surface environment to be tested and the moving speed of the unmanned control device.

In this embodiment, the terminal device determines the multipath fading mode according to a physical environment model in which the unmanned aerial vehicle needs to operate and a moving speed of the unmanned aerial vehicle, and in this case, may classify the physical environment model and determine fading characteristics under different physical environment models. Optionally, the physical environment model may be divided into a water surface, a city, a country, a hill, and the like, wherein the city may be marked with a symbol TU, the RA country may be marked with a symbol RA, the hill may be marked with a symbol HT, the water surface characteristics may be set by user-definition at present, and then the corresponding fading characteristics under different physical environment models are determined. Meanwhile, the moving speed of the unmanned control equipment can also influence signal fading, so that different fading characteristics can be determined according to different moving speeds. Then, combining the moving speed with the physical environment model, one type of multipath fading pattern can be uniquely defined, for example, when it is required to determine that the moving speed of the unmanned device in the urban environment is 100 meters per second sensitivity, the multipath fading pattern to be tested is set as TU 100.

In S202, the fading signal simulator is set based on the multipath fading mode, and the noise signal is generated according to the frequency domain information of the useful signal.

In this embodiment, in order to measure the sensitivity of the useful signal, it is necessary to combine the multipath fading interference signal and the multipath fading useful signal, and input the combined signal to the base station to perform the sensitivity test. Therefore, based on the obtained multipath fading mode, a fading signal simulator is set, and a noise signal and a multipath fading useful signal are generated and combined.

It can be seen from the above that, the present invention determines the multipath fading mode by collecting the current physical environment information and the moving speed of the unmanned device, and classifies the test environment, thereby being capable of setting the subsequent test parameters and error code information.

Fig. 8 is a block diagram illustrating a structure of a sensitivity test terminal according to an embodiment of the present invention, where the sensitivity test terminal includes units for performing the steps in the embodiments corresponding to fig. 1 to 7. Please refer to the related descriptions of the embodiments corresponding to fig. 1 to fig. 7. For convenience of explanation, only the portions related to the present embodiment are shown.

Referring to fig. 8, the sensitivity test terminal includes:

a test parameter obtaining unit 81, configured to determine a test parameter of a multipath fading mode based on a water surface environment;

the error code characteristic information acquisition unit 82 is used for acquiring error code characteristic information of the multipath fading simulation signal; the multipath fading signal comprises a useful signal and a noise signal which are processed by a fading signal simulator corresponding to the multipath fading mode; the useful signal is generated based on the test parameter;

a test parameter adjusting unit 83, configured to determine an adjustment parameter according to the error code characteristic information if the error code characteristic information does not satisfy the convergence condition of the multipath fading mode, and adjust the test parameter based on the adjustment parameter;

the error code characteristic information returning and acquiring unit 84 is configured to return and execute the error code characteristic information of the acquired multipath fading simulation signal based on the adjusted test parameter;

and a sensitivity deriving unit 85, configured to determine, if the error code characteristic information satisfies the convergence condition, the sensitivity of the useful signal in the multipath fading mode based on a test parameter corresponding to the convergence condition being satisfied.

Optionally, the test parameter adjusting unit 83 includes:

the real-time error rate acquisition unit is used for acquiring the real-time error rate of each signal frame in the multipath fading simulation signal; the useful signal in the multipath fading analog signal is generated based on the signal level; the signal duration of the multipath fading simulation signal is determined based on the test frame number;

the error code characteristic value calculating unit is used for calculating the error code average value and the error code standard difference value based on a plurality of real-time error code rates matched with the number of the test frames;

the signal level adjusting unit is used for adjusting the signal level in the test parameter according to the adjusting step length corresponding to the bit error rate mean value;

and the test frame number adjusting unit is used for adjusting the test frame number in the test parameters according to the adjusting proportion corresponding to the standard error rate difference value.

Optionally, the signal level adjusting unit includes:

the adjustment direction determining unit is used for determining a difference absolute value and an adjustment direction of the adjustment step length according to a difference value between the error rate average value and a preset expected error rate average value;

a first adjustment amplitude determining unit, configured to set an adjustment amplitude of the adjustment step length as a first adjustment amplitude if the absolute value of the difference is greater than or equal to a preset first threshold;

a second adjustment amplitude determining unit, configured to set an adjustment amplitude of the adjustment step to be a second adjustment amplitude if the absolute value of the difference is smaller than the first threshold and not smaller than a preset second threshold, where the first adjustment amplitude is N times the second adjustment amplitude; n is a positive number greater than 1; the first threshold is greater than the second threshold;

a third adjustment amplitude determining unit, configured to set an adjustment amplitude of the adjustment step as a third adjustment amplitude if the absolute value of the difference is smaller than the second threshold, where the third adjustment amplitude is smaller than the second adjustment amplitude;

and the signal level output unit is used for adjusting the signal level in the adjusting direction by the adjusting step length.

Optionally, the test frame number adjusting unit includes:

an adjustment ratio determining unit, configured to set the adjustment ratio to M if the error rate standard difference is greater than or equal to a preset first standard difference; m is an integer greater than 1; if the error rate standard difference value is smaller than the first standard difference value and not smaller than a preset second standard difference value, setting the adjustment ratio to be 1/M; the first standard deviation value is greater than the second standard deviation value; if the standard deviation value of the error rate is smaller than the second standard deviation value, setting the adjustment proportion to 1/2M;

and the test frame number output unit is used for adjusting the test frame number based on the adjusting proportion.

Optionally, the real-time bit error rate acquiring unit includes:

the detection interruption unit stops outputting the multipath fading simulation signal if detecting that the check bit error rate of any signal frame is greater than the preset error rate upper limit value; the upper error rate limit is determined based on the multipath fading mode;

and the detection restarting unit is used for restarting to acquire the real-time bit error rate of each signal frame in the multipath fading simulation signal.

Optionally, the sensitivity deriving unit 85 includes:

the convergence identification unit is used for identifying that the test parameter meets the convergence condition if the real-time error rate of the last signal frame is less than a preset expected error rate; the expected bit error rate is determined based on the multipath fading pattern.

It can be seen from the above that, the sensitivity test terminal provided in the embodiment of the present invention can also dynamically adjust the test parameters according to different bit error rate information, that is, the adjustment parameters in the adjustment process are not fixed, but an appropriate adjustment amplitude can be determined according to the bit error rate information, so that fast convergence of the test process can be achieved, the test parameters meeting the convergence conditions corresponding to the multipath fading mode are determined fast, the sensitivity is determined according to the test parameters meeting the convergence conditions, the time-consuming duration of the sensitivity test is reduced, and the test efficiency is improved.

Fig. 9 is a schematic diagram of a terminal device according to another embodiment of the present invention. As shown in fig. 9, the terminal device 9 of this embodiment includes: a processor 90, a memory 91 and a computer program 92 stored in said memory 91 and executable on said processor 90, such as a test parameter program for determining a multipath fading pattern based on the water surface environment. The processor 90, when executing the computer program 92, implements the steps in one embodiment of the sensitivity testing method described above, such as S101-S105 shown in fig. 2. Alternatively, the processor 90 executes the computer program 92 to implement the functions of the devices in the test environment embodiment for testing sensitivity, such as the functions of the modules 801 to 805 shown in fig. 8.

Illustratively, the computer program 92 may be divided into one or more units, which are stored in the memory 91 and executed by the processor 90 to carry out the invention. The one or more units may be a series of computer program instruction segments capable of performing specific functions, which are used to describe the execution process of the computer program 92 in the terminal device 9.

The terminal device 9 may be a desktop computer, a notebook, a palm computer, a cloud server, or other computing devices. The terminal device may include, but is not limited to, a processor 90, a memory 91. Those skilled in the art will appreciate that fig. 9 is only an example of a terminal device 9, and does not constitute a limitation to the terminal device 9, and may include more or less components than those shown, or combine some components, or different components, for example, the terminal device may also include an input-output device, a network access device, a bus, etc.

The Processor 90 may be a Central Processing Unit (CPU), other general purpose Processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), a Field-Programmable Gate Array (FPGA) or other Programmable logic device, discrete Gate or transistor logic, discrete hardware components, etc. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like.

The memory 91 may be an internal storage unit of the terminal device 9, such as a hard disk or a memory of the terminal device 9. The memory 91 may also be an external storage device of the terminal device 9, such as a plug-in hard disk, a Smart Media Card (SMC), a Secure Digital (SD) Card, a Flash memory Card (Flash Card), and the like, which are provided on the terminal device 9. Further, the memory 91 may also include both an internal storage unit and an external storage device of the terminal device 9. The memory 91 is used for storing the computer program and other programs and data required by the terminal device. The memory 91 may also be used to temporarily store data that has been output or is to be output.

It will be apparent to those skilled in the art that, for convenience and brevity of description, only the above-mentioned division of the functional units and modules is illustrated, and in practical applications, the above-mentioned function distribution may be performed by different functional units and modules according to needs, that is, the internal structure of the apparatus is divided into different functional units or modules to perform all or part of the above-mentioned functions. Each functional unit and module in the embodiments may be integrated in one processing unit, or each unit may exist alone physically, or two or more units are integrated in one unit, and the integrated unit may be implemented in a form of hardware, or in a form of software functional unit. In addition, specific names of the functional units and modules are only for convenience of distinguishing from each other, and are not used for limiting the protection scope of the present application. The specific working processes of the units and modules in the system may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.

The embodiments of the present application further provide a computer-readable storage medium, where a computer program is stored, and when the computer program is executed by a processor, the computer program implements the steps in the above-mentioned method embodiments.

The embodiments of the present application provide a computer program product, which when running on a mobile terminal, enables the mobile terminal to implement the steps in the above method embodiments when executed.

In the above embodiments, the descriptions of the respective embodiments have respective emphasis, and reference may be made to the related descriptions of other embodiments for parts that are not described or illustrated in a certain embodiment.

Those of ordinary skill in the art will appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present application.

The above-mentioned embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not substantially depart from the spirit and scope of the embodiments of the present application and are intended to be included within the scope of the present application.

Claims

1. A method for testing sensitivity in the presence of multipath fading interference, comprising:

2. The method for testing the sensitivity of claim 1, wherein the test parameters comprise: signal level and test frame number; the error code characteristic information comprises: the mean error rate and the standard error rate difference; the adjusting parameters comprise: adjusting step length and adjusting proportion;

3. The method for testing the sensitivity according to claim 2, wherein the adjusting the signal level in the test parameter according to the adjustment step corresponding to the bit error rate mean value includes:

4. The method according to claim 2, wherein the adjusting the number of the test frames in the test parameters according to the adjustment factor corresponding to the standard deviation of the bit error rate as an adjustment ratio comprises:

if the standard error rate difference value is smaller than the second standard difference value, setting the adjustment proportion to 1/2M;

and adjusting the test frame number based on the adjusting proportion.

5. The method for testing the sensitivity according to claim 2, wherein the acquiring the real-time bit error rate of each signal frame in the multipath fading simulation signal further comprises:

if the error rate of the check bit of any signal frame is detected to be greater than the preset error rate upper limit value, stopping outputting the multipath fading simulation signal; the upper error rate limit is determined based on the multipath fading mode;

6. The sensitivity testing method according to any one of claims 1-5, wherein before determining the test parameters of the multipath fading mode based on the water surface environment, further comprising:

setting the fading signal simulator based on the multipath fading mode;

7. The method for testing sensitivity of any one of claims 1-5, wherein the error code characteristic information further comprises: the real-time bit error rate of the last signal frame in the multipath simulated fading signal;

if the error code characteristic information meets the convergence condition, determining the sensitivity of the useful signal in the multipath fading mode based on the test parameters corresponding to the convergence condition, including:

8. A terminal device comprising a memory, a processor and a computer program stored in the memory and executable on the processor, characterized in that the processor implements the method according to any of claims 1 to 7 when executing the computer program.

9. A sensitivity testing system, comprising: base station, combiner, at least two fading signal simulators and terminal equipment according to claim 8.

10. A computer-readable storage medium, in which a computer program is stored which, when being executed by a processor, carries out the method according to any one of claims 1 to 7.