Frequency selection method, device, computer equipment and medium for shortwave communication

Abstract

Embodiments of the present invention provide a frequency selection method, apparatus, computer device, and medium for shortwave communication. The method includes the following steps: determining a primary frequency selection interval based on the optimal operating frequency (FOT) of the current link, a link reliability threshold, and a frequency availability threshold; calculating a first weight #imgabs0#, a first probability density function, a second weight #imgabs1#, a second probability density function, a third weight #imgabs2#, and a third probability density function based on the continuity of the probability density function and the integral of the probability density function being 1; obtaining a preselected frequency based on the first, second, and third probability density functions, and selecting the center frequency corresponding to the channel number closest to the preselected frequency as the frequency for the current shortwave communication selection. This scheme selects frequencies using the dual constraints of link reliability and frequency availability, thereby improving frequency security and ensuring both link reliability and frequency availability for the selected frequency.

Description

Technical Field

[0001] The present invention relates to the technical field of communication frequency selection, and in particular to a frequency selection method, device, computer equipment and medium for shortwave communication. Background Art

[0002] In shortwave communication, whether skywave communication can be achieved is closely related to the selected communication frequency. Under the condition that the location and time of the transmitting and receiving nodes are known, the optimal operating frequency FOT between the two points can be determined, and its link reliability REL and frequency availability MUFday can be calculated by software. Usually the frequency availability of FOT is MUFday_FOT=90%. When the frequency rises from FOT, MUFday will continue to decrease, and REL will also decrease after maintaining a stable frequency width. When the frequency decreases from FOT, MUFday will continue to increase until MUFday reaches 1, and REL will also decrease after maintaining a stable frequency width. As Figure 3 shown.

[0003] Based on the above characteristics, frequency selection can be performed under the dual constraints of link reliability and frequency availability. In high-quality frequency selection bands with good link reliability and frequency availability, frequency selection is performed according to a uniform distribution model. In suboptimal frequency selection bands adjacent to high-quality frequency selection bands, frequency selection is performed according to a quasi-Gaussian distribution model. The closer to the high-quality frequency band, the higher the probability of frequency generation. Figure 4 shown.

[0004] Existing frequency selection algorithms typically select frequencies based on link reliability. After calculating the FOT through software, they prioritize it for frequency detection, which can easily leak FOT information. The rationality of frequency selection methods that fail to consider frequency availability is also questionable. Summary of the Invention

[0005] In view of this, an embodiment of the present invention provides a frequency selection method for shortwave communication to solve the technical problem in the prior art that FOT information is easily leaked and frequency availability is not considered. The method includes:

[0006] The primary frequency selection interval is determined based on the optimal operating frequency FOT of the current link, the link reliability high-quality threshold, the link reliability suboptimal threshold, and the frequency availability suboptimal threshold. The primary frequency selection interval includes a high-quality frequency band and a suboptimal frequency band. The suboptimal frequency band includes a first-optimal frequency band and a second-optimal frequency band. The first-optimal frequency band, the high-quality frequency band, and the second-optimal frequency band increase in order of frequency.

[0007] Construct the first weight corresponding to the high-quality frequency band according to the high-quality frequency band, the first-time high-quality frequency band and the second-time high-quality frequency band The first probability density function, the second weight corresponding to the first optimal frequency band The second probability density function and the third weight corresponding to the second optimal frequency band The third probability density function, assuming that the first probability density function obeys uniform distribution, the second probability density function and the third probability density function obey Gaussian distribution, according to the probability density function is continuous and the probability density function integral is 1, calculate the first weight , the first probability density function, the second weight , the second probability density function, the third weight and the third probability density function;

[0008] The preselected frequency is obtained according to the first probability density function, the second probability density function, and the third probability density function, and the center frequency corresponding to the channel number closest to the preselected frequency is used as the frequency for the current shortwave communication frequency selection.

[0009] The present invention also provides a frequency selection device for shortwave communication to solve the technical problem in the prior art that FOT information is easily leaked and frequency availability is not considered. The device includes:

[0010] The frequency selection interval acquisition module is used to determine the main frequency selection interval according to the optimal operating frequency FOT of the current link. The main frequency selection interval includes a high-quality frequency band and a suboptimal frequency band. The suboptimal frequency band includes a first-optimal frequency band and a second-optimal frequency band. The first-optimal frequency band, the high-quality frequency band, and the second-optimal frequency band increase in order of frequency.

[0011] The probability density function generation module is used to construct the first weight corresponding to the high-quality frequency band based on the high-quality frequency band, the first-time high-quality frequency band, and the second-time high-quality frequency band. The first probability density function, the second weight corresponding to the first optimal frequency band The second probability density function and the third weight corresponding to the second optimal frequency band The third probability density function, assuming that the first probability density function obeys uniform distribution, the second probability density function and the third probability density function obey Gaussian distribution, according to the probability density function is continuous and the probability density function integral is 1, calculate the first weight , the first probability density function, the second weight , the second probability density function, the third weight and the third probability density function;

[0012] The frequency point generation module is used to obtain the preselected frequency according to the first probability density function, the second probability density function, and the third probability density function, and use the center frequency point corresponding to the channel number closest to the preselected frequency as the frequency point for this shortwave communication selection.

[0013] An embodiment of the present invention also provides a computer device, including a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, the computer device implements any of the above-mentioned frequency selection methods for shortwave communication to solve the technical problem in the prior art that FOT information is easily leaked and frequency availability is not considered.

[0014] An embodiment of the present invention also provides a computer-readable storage medium storing a computer program for executing any of the above-mentioned frequency selection methods for shortwave communication, so as to solve the technical problem in the prior art that FOT information is easily leaked and frequency availability is not considered.

[0015] Compared with the prior art, the at least one technical solution adopted in the embodiments of this specification can achieve the following beneficial effects:

[0016] The link quality and frequency availability of the frequency point selected by the shortwave communication frequency selection method according to the embodiment of the present invention are both well guaranteed, and the detection frequency can be randomized, thereby improving the safety of frequency use. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0018] Figure 1 This is a flow chart of a frequency selection method for shortwave communication provided by an embodiment of the present invention;

[0019] Figure 2 is a flow chart of a frequency selection method for implementing the above-mentioned shortwave communication provided by an embodiment of the present invention;

[0020] Figure 3 It is a schematic diagram of REL and MUFday for the premium and sub-optimal frequency bands;

[0021] Figure 4 Schematic diagram of a frequency generation probability density function and an integral function provided by an embodiment of the present invention;

[0022] Figure 5 This is a schematic diagram of the REL and MUFday of some frequency points of a shortwave link obtained by software calculation according to an embodiment of the present invention;

[0023] Figure 6 Schematic diagram of a frequency probability density function of a frequency selection in a Monte Carlo simulation according to an embodiment of the present invention;

[0024] Figure 7 Schematic diagram of a frequency probability density integral function of a frequency selection in a Monte Carlo simulation according to an embodiment of the present invention;

[0025] Figure 8 This is a structural block diagram of a computer device provided by an embodiment of the present invention;

[0026] Figure 9 This is a structural block diagram of a frequency selection device for shortwave communication provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0027] The embodiments of the present application are described in detail below with reference to the accompanying drawings.

[0028] The following describes the embodiments of the present application through specific examples, and those skilled in the art can easily understand other advantages and effects of the present application from the contents disclosed in this specification. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. The present application can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present application. It should be noted that, in the absence of conflict, the features in the following embodiments and embodiments can be combined with each other. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without making creative work are within the scope of protection of this application.

[0029] The known parameters of the shortwave communication frequency selection method according to the embodiment of the present invention are: the positions of the communicating parties, the communication time, the antenna gain, the power amplifier power, the required signal-to-noise ratio, and the required link reliability.

[0030] The frequency of optimal throughput (FOT) for a shortwave link is the frequency at which the link achieves statistically optimal communication performance, determined based on long-term observations and shortwave link modeling. For shortwave communication links, the FOT is typically 80% to 90% of the maximum usable frequency (MUF).

[0031] The constraints of the shortwave communication frequency selection method in the embodiment of the present invention are: shortwave skywave channels are used for communication, and the terminal has no auxiliary information such as historical data and spectrum monitoring data to optimize the frequency selection algorithm, and the impact of occasional factors such as solar storms on the ionosphere is not considered.

[0032] The method objective of the shortwave communication frequency selection method according to an embodiment of the present invention is to determine the approximate upper and lower bounds of the frequency selection range based on the link reliability (REL) and frequency availability (MUFday) of each frequency point and the corresponding threshold value through calculation using shortwave link prediction software, so that the selected frequencies are mainly generated within the range, and the frequencies in the high-quality frequency band with good REL and MUFday comprehensive indicators have a higher uniform generation probability. As the frequency moves away from the high-quality frequency band, the frequency generation probability decreases according to a quasi-Gaussian law.

[0033] In an embodiment of the present invention, a frequency selection method for shortwave communication is provided, such as Figure 1 and Figure 2 As shown, the method includes:

[0034] Step S101: determining a primary frequency selection interval based on the optimal operating frequency FOT of the current link, a high-quality link reliability threshold, a suboptimal link reliability threshold, and a suboptimal frequency availability threshold, wherein the primary frequency selection interval includes a high-quality frequency band and a suboptimal frequency band, and the suboptimal frequency band includes a first-optimal frequency band and a second-optimal frequency band, and the first-optimal frequency band, the high-quality frequency band, and the second-optimal frequency band increase in order of frequency.

[0035] Step S102: Constructing a first weight corresponding to the high-quality frequency band according to the high-quality frequency band, the first-time high-quality frequency band, and the second-time high-quality frequency band The first probability density function, the second weight corresponding to the first optimal frequency band The second probability density function and the third weight corresponding to the second optimal frequency band The third probability density function, assuming that the first probability density function obeys uniform distribution, the second probability density function and the third probability density function obey Gaussian distribution, according to the probability density function is continuous and the probability density function integral is 1, calculate the first weight , the first probability density function, the second weight , the second probability density function, the third weight and the third probability density function;

[0036] Step S103: Obtain the preselected frequency according to the first probability density function, the second probability density function, and the third probability density function, and use the center frequency corresponding to the channel number closest to the preselected frequency as the frequency for this shortwave communication selection.

[0037] A high-quality frequency band is one with good comprehensive indicators of link reliability (REL) and frequency availability (MUFday). A suboptimal frequency band is one with slightly worse link reliability (REL) or frequency availability (MUFday) than a high-quality frequency band, but still has better comprehensive indicators than other frequency bands.

[0038] Specifically, the method for selecting frequency for shortwave communication according to an embodiment of the present invention is mainly divided into three parts:

[0039] (1) Determine the main frequency selection interval. Calculate the optimal operating frequency (FOT) of the current link and the corresponding link reliability REL and frequency availability MUFday. Starting from the FOT interval with a fixed frequency, calculate the REL and MUFday of each frequency downward until the REL of a certain frequency is lower than the link reliability high-quality threshold. The previous frequency point f1 to FOT is the high-quality frequency selection band. Continue to calculate the REL and MUFday of each frequency downward at the same frequency interval until the REL of a certain frequency is lower than the link reliability suboptimal threshold. The previous frequency is recorded as f2. Starting from the FOT interval with a fixed frequency, calculate the REL and MUFday of each frequency upward until the REL or MUFday of a certain frequency is lower than the link reliability suboptimal threshold or the frequency availability suboptimal threshold. The previous frequency is recorded as f3. Frequency f2 to frequency f3 is the main frequency selection interval.

[0040] (2) Determine the parameters of the frequency generation model within the main frequency selection interval. The frequency range from f1 to FOT is the high-quality frequency selection band, and the frequency selection frequency is generated according to the uniform distribution model; the frequency range from f2 to f1 is the suboptimal frequency band 1, and the frequency selection frequency is generated according to the first-class Gaussian distribution (the Gaussian distribution is a probability distribution that is similar to the Gaussian distribution in shape and characteristics); the frequency range from FOT to f3 is the suboptimal frequency band 2, and the frequency selection frequency is generated according to the Gaussian distribution model 2. Based on the fact that the frequency generation probability density function within the frequency selection band is a continuous function and the integral of the probability density function under the three frequency bands is 1, determine the probability density generation function and weights (area under the curve) of the three frequency bands.

[0041] (3) Generate a selected frequency and perform frequency detection. First, generate a random number. Based on the random number and the weights of each frequency band, determine the frequency range for this frequency generation. Generate this frequency based on the probability density function of the corresponding frequency band. Perform detection on the generated frequency. If the detection is unsuccessful, use the same method to generate a new frequency until the detection is successful.

[0042] In specific implementation, the following steps are performed to determine the main frequency selection interval based on the optimal operating frequency FOT of the current link, the link reliability high-quality threshold, the link reliability suboptimal threshold, and the frequency availability suboptimal threshold:

[0043] Obtain the optimal operating frequency FOT of the current link, and calculate the optimal link reliability corresponding to the optimal operating frequency based on the optimal operating frequency; set a fixed frequency; obtain multiple first intermediate frequencies from the optimal operating frequency FOT toward the low frequency direction at fixed frequencies, and calculate the link reliability of each first intermediate frequency until the last first intermediate frequency with a link reliability lower than the link reliability quality threshold is obtained, and use the last first intermediate frequency with a link reliability not lower than the link reliability quality threshold as the lowest frequency of the quality frequency band, and use the optimal operating frequency as the highest frequency of the quality frequency band; obtain multiple second intermediate frequencies from the lowest frequency of the quality frequency band toward the low frequency direction at fixed frequencies, and calculate the link reliability of each second intermediate frequency until the last first intermediate frequency with a link reliability lower than the link reliability quality threshold is obtained. The second intermediate frequency of the reliability suboptimal threshold, the second intermediate frequency with the last link reliability not lower than the link reliability suboptimal threshold is used as the lowest frequency of the first optimal frequency band, and the lowest frequency of the high-quality frequency band is used as the highest frequency of the first optimal frequency band; with a fixed frequency as an interval, from the optimal operating frequency FOT to the high frequency direction, multiple third intermediate frequencies are obtained, and the link reliability and frequency availability of each third intermediate frequency are calculated until the third intermediate frequency with the last link reliability lower than the reliability suboptimal threshold or the frequency availability lower than the frequency availability suboptimal threshold is obtained, the third intermediate frequency with the last link reliability not lower than the reliability suboptimal threshold and the frequency availability not lower than the frequency availability suboptimal threshold is used as the highest frequency of the second optimal frequency band, and the best operating frequency of the link is used as the lowest frequency of the second optimal frequency band.

[0044] In specific implementation, the fixed frequency is determined by the following steps:

[0045] The size of the fixed frequency is determined according to the calculation time and calculation accuracy required by the frequency selection method.

[0046] Specifically, the optimal operating frequency (FOT) of the current link and the corresponding link reliability (REL_FOT) and frequency availability (MUFday_FOT) are calculated (MUFday_FOT is fixed at 90%). Starting from a fixed FOT interval frequency (k) (k is a compromise between required calculation time and accuracy; greater accuracy increases calculation time, for example, 100 kHz), the REL and MUFday are calculated for each frequency until the REL at a frequency falls below the quality threshold (REL0) (REL0 can be set to be the same as or slightly lower than REL_FOT). The previous frequency that meets REL0 is recorded as f1.

[0047] Continue calculating the REL and MUFday for each frequency with an interval of frequency k until the REL of a certain frequency is lower than the suboptimal reliability threshold REL_th (REL_th is set to the required reliability REQ.REL of the link, or is set according to the acceptable REL). The previous frequency with a REL not lower than the suboptimal reliability threshold REL_th is recorded as f2.

[0048] Starting from the fixed frequency k at the FOT interval, calculate the REL and MUFday of each frequency upwards until the REL of a certain frequency is lower than the reliability suboptimal threshold REL_th or the MUFday of this frequency is lower than the frequency availability suboptimal threshold MUFday_th (set according to the acceptable frequency availability). The previous frequency that can meet the suboptimal threshold requirements is recorded as f3.

[0049] Frequency f2 to frequency f3 is the main frequency selection range.

[0050] In specific implementation, the following steps are used to construct the first weight corresponding to the high-quality frequency band according to the high-quality frequency band, the first-time high-quality frequency band, and the second-time high-quality frequency band. The first probability density function, the second weight corresponding to the first optimal frequency band The second probability density function and the third weight corresponding to the second optimal frequency band The third probability density function, assuming that the first probability density function obeys uniform distribution, the second probability density function and the third probability density function obey Gaussian distribution, according to the probability density function is continuous and the probability density function integral is 1, calculate the first weight , the first probability density function, the second weight , the second probability density function, the third weight And the third probability density function:

[0051] Calculate the bandwidth a of the high-quality frequency band, the bandwidth b of the first-time high-quality frequency band, and the bandwidth c of the second-time high-quality frequency band respectively, where the bandwidth is the highest frequency of the frequency band minus the lowest frequency of the same frequency band; construct the first weight corresponding to the high-quality frequency band through the bandwidth a of the high-quality frequency band The first probability density function of the first optimal frequency band is constructed by the bandwidth b of the first optimal frequency band. The second probability density function of the second optimal frequency band is constructed by the bandwidth c of the second optimal frequency band. The third probability density function of the high-quality frequency band; According to the continuity of the first probability density function of the high-quality frequency band and the second probability density function of the first-time high-quality frequency band, the second weight is constructed With the first weight The relationship: ,in, is the first weight, is the second weight, K is a constant, a is the bandwidth of the high-quality frequency band, and b is the bandwidth of the first-time high-quality frequency band; according to the continuity of the first probability density function of the high-quality frequency band and the third probability density function of the second-time high-quality frequency band, the third weight is constructed. With the first weight The relationship: ,in, is the first weight, is the third weight, K is a constant, a is the bandwidth of the high-quality frequency band, and c is the bandwidth of the second-best frequency band; according to the second weight With the first weight The relationship between the third weight C and the first weight The relationship and the first weight , the second weight and the third weight The sum is 1, and the first weight A and the second weight are obtained. and the third weight ,in, , , .

[0052] Specifically, the K value is a constant, which determines the probability that the frequency is in the first optimal frequency band and the second optimal frequency band when the frequency is generated according to the Gaussian distribution. The larger the K value is, the greater the probability that the frequency is in the suboptimal frequency band when the frequency is generated according to the Gaussian distribution.

[0053] In specific implementation, the following steps are used to construct the first weight corresponding to the high-quality frequency band through the bandwidth a of the high-quality frequency band: The first probability density function of:

[0054] Assuming that the probability within the high-quality frequency band follows a uniform distribution, the first weight corresponding to the high-quality frequency band is The first probability density function ,in, is the first probability density function, is the optimal operating frequency of the link, ≤ the frequency of the first probability density function ≤ , is the lowest frequency of the high-quality frequency band, and a is the bandwidth of the high-quality frequency band.

[0055] In specific implementation, the following steps are used to construct the second weight corresponding to the first optimal frequency band through the bandwidth b of the first optimal frequency band: The second probability density function of the second optimal frequency band is constructed by the bandwidth c of the second optimal frequency band. The third probability density function: Assume that the probability in the first optimal frequency band obeys the mean , the mean square error is The second weight is The second probability density function ,in, is the second probability density function, mean square error , is the highest frequency of the first optimal frequency band, is the lowest frequency of the first optimal frequency band, and the frequency x of the second probability density function is < , is a natural constant; assuming that the probability in the second optimal frequency band obeys the mean , the mean square error is The Gaussian distribution of The third probability density ,in, is the third probability density function, mean square error , is the optimal operating frequency of the link, is the highest frequency of the second optimal frequency band, and the frequency x of the third probability density function is .

[0056] Specifically, the frequency band from f1 to FOT is a high-quality frequency band, and the REL and MUFday of each frequency are both good. A first weight value A is assigned, that is, the area under the probability density function in the high-quality frequency band is A.

[0057] The frequency range from f2 to f1 is the first optimal frequency range. As the frequency decreases, REL gradually decreases and is assigned the second weight B. Obviously, the area under the first type of Gaussian curve is B.

[0058] The frequency range from FOT to f3 is the second optimal frequency range. As the frequency increases, the REL or MUFday gradually decreases, and is assigned a third weight C. Obviously, the area under the second-class Gaussian curve is C.

[0059] The bandwidth of the high-quality frequency band is recorded as a=FOT-f1, the bandwidth of the first-time high-quality frequency band is recorded as b=f1-f2, and the bandwidth of the second-time high-quality frequency band is recorded as c=f3-FOT. ,and .

[0060] Since the probability density function of the high-quality frequency band and the first-time high-quality frequency band is continuous, then ,Right now Since the probability density functions of the high-quality frequency band and the second-best frequency band are continuous, ,Right now .

[0061] Set the K value as needed. The larger the K value, the greater the probability that the frequency will be in the suboptimal frequency band when generating frequencies using a quasi-Gaussian distribution.

[0062] Because the weights satisfy A+B+C=1, then , , .

[0063] In specific implementation, the following steps are performed to obtain the preselected frequency according to the first probability density function, the second probability density function, and the third probability density function:

[0064] Generate random numbers y , where the random number y Between [0, 1]; if 0≤random number y <Second weight B , according to the mean of the highest frequency of the first optimal frequency band, the mean square error The Gaussian distribution of generates a new frequency point as the pre-selected frequency generated this time. If the pre-selected frequency is less than the highest frequency of the first optimal frequency band and greater than or equal to the lowest frequency of the first optimal frequency band, the frequency selection operation is terminated. If not, the pre-selected frequency is re-generated. If 1-the third weight C <Random number y ≤1, based on the mean value of the optimal operating frequency FOT, mean square error The Gaussian distribution of generates a new frequency point as the pre-selected frequency generated this time. If the pre-selected frequency is greater than the lowest frequency of the second optimal frequency band and less than or equal to the highest frequency of the second optimal frequency band, the frequency selection operation is terminated. If not, the pre-selected frequency is regenerated; the second weight B ≤ random number y ≤1-third weight C , a random number is generated in the high-quality frequency band according to uniform distribution as the pre-selected frequency this time.

[0065] Specifically, a random number y between [0, 1] is generated, and the preselected frequency is generated according to the value of y as follows:

[0066] If 0≤y<B, a new frequency point is generated according to the Gaussian distribution with mean f1 and mean square deviation σ1 as the pre-selected frequency generated this time (less than f1 and greater than or equal to f2).

[0067] If 1-C<y≤1, a new frequency point is generated according to the Gaussian distribution with mean FOT and mean square deviation σ2 as the pre-selected frequency generated this time (greater than FOT and less than or equal to f3).

[0068] Otherwise, a random frequency point is generated between f1 and FOT according to a uniform distribution as the preselected frequency generated this time.

[0069] The center frequency corresponding to the channel number closest to the pre-selected frequency is used as the frequency for this frequency selection.

[0070] One embodiment of the present invention:

[0071] (1) The results calculated using a shortwave communication link software are as follows: Figure 5 The optimal operating frequency of the link is FOT = 13.5 MHz, with corresponding link reliability REL_FOT = 94% and frequency availability MUFday_FOT = 90%.

[0072] (2) Set the fixed frequency interval k, where k is set to 100 kHz. Set the link reliability high-quality threshold REL0, where REL0 is set to 91%. Set the link reliability suboptimal threshold REL_th, where REL_th is set to 90%. Set the frequency availability suboptimal threshold MUFday_th, where MUFday_th is set to 85%.

[0073] (3) Starting at a fixed FOT interval of frequency k, calculate the REL and MUFday for each frequency until the REL at a certain frequency falls below the optimal threshold, REL0. Determine the value of f1, here f1 = 10.6 MHz. Continue calculating the REL and MUFday for each frequency at intervals of frequency k until the REL at a certain frequency falls below the suboptimal threshold, REL_th. Determine the value of f2, here f2 = 10 MHz.

[0074] (4) Starting from the FOT interval frequency k, calculate the REL and MUFday of each frequency upward until the REL or MUFday of a frequency falls below the REL suboptimal threshold REL_th or the MUFday suboptimal threshold MUFday_th. Determine the value of f3, where f3 = 13.9 MHz.

[0075] (5) Frequency f2 to frequency f3 is the main frequency selection range. Frequency f1 to frequency FOT is the high-quality frequency band, with bandwidth a=FOT-f1, where a=2.9MHz. The high-quality frequency band is assigned a weight A. The frequencies within the high-quality frequency band obey a uniform distribution, and the probability density function for: , where f1≤x≤FOT; the frequency f2 to frequency f1 is the first optimal frequency band, with bandwidth b=f1-f2, where b=0.6MHz, and weight B. The frequencies in the first optimal frequency band obey the first type of Gaussian distribution, with mean f1 and mean square error of ,and =b / K, probability density function , where x < f1; the frequency FOT to frequency f3 is the second optimal frequency band, with a bandwidth c = f3 - FOT, where c = 0.4 MHz, and a third weight C. The frequencies within the second optimal frequency band obey the second type of Gaussian distribution, with a mean of FOT and a mean square error of ,and =c / K, probability density function , where x>FOT.

[0076] (6) According to the continuity of the probability density function of the high-quality frequency band and the first-time optimal frequency band, we have: , we can get: According to the continuity of the probability density function of the high-quality frequency band and the second-best frequency band, we have: , we can get: .

[0077] (7) The weights satisfy A+B+C=1.

[0078] (8) Set the K value. Here K = .

[0079] (9) Combining (6) to (8) we can get: , , .

[0080] (10) Generate a random number y between [0, 1] and generate the preselected frequency according to the value of y as follows:

[0081] If 0≤y<B, the mean is f1 and the mean square error is The Gaussian distribution generates a new frequency point as the pre-selected frequency generated this time (less than f1 and greater than or equal to f2);

[0082] If 1-C<y≤1, the mean is FOT, and the mean square error is The Gaussian distribution generates a new frequency point as the pre-selected frequency generated this time (greater than FOT and less than or equal to f3);

[0083] Otherwise, a random frequency point is generated between f1 and FOT according to a uniform distribution as the preselected frequency generated this time.

[0084] (11) The frequency corresponding to the channel number closest to the pre-selected frequency is used as the frequency for this frequency selection.

[0085] According to the above parameters, the Monte Carlo simulation method is used to perform 100 million frequency selection simulations. The probability density distribution of the frequency selection is as follows: Figure 6 As shown, the frequency integral function of the selected frequency is as follows Figure 7 As shown in Figure 3, the simulation curve is in good agreement with the theoretical curve.

[0086] In this embodiment, a computer device is provided, such as Figure 8 As shown, it includes a memory 801, a processor 802 and a computer program stored in the memory and capable of running on the processor. When the processor executes the computer program, any of the above-mentioned frequency selection methods for shortwave communication is implemented.

[0087] Specifically, the computer device may be a computer terminal, a server or a similar computing device.

[0088] In this embodiment, a computer-readable storage medium is provided, wherein the computer-readable storage medium stores a computer program for executing any of the above-mentioned frequency selection methods for shortwave communication.

[0089] Specifically, computer-readable storage media include permanent and non-permanent, removable and non-removable media, and can be implemented by any method or technology to store information. Information can be computer-readable instructions, data structures, program modules or other data. Examples of computer-readable storage media include, but are not limited to, phase change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other memory technology, compact disc read-only memory (CD-ROM), digital versatile disc (DVD) or other optical storage, magnetic cassettes, tape disk storage or other magnetic storage devices or any other non-transmission media that can be used to store information that can be accessed by a computing device. As defined herein, computer-readable storage media does not include transitory media such as modulated data signals and carrier waves.

[0090] Based on the same inventive concept, an embodiment of the present invention further provides a frequency selection device for shortwave communication, as described in the following embodiments. Since the principle of solving the problem of the frequency selection device for shortwave communication is similar to that of the frequency selection method for shortwave communication, the implementation of the frequency selection device for shortwave communication can refer to the implementation of the frequency selection method for shortwave communication, and the repeated parts will not be repeated. As used below, the terms "unit" or "module" can refer to a combination of software and / or hardware that implements a predetermined function. Although the devices described in the following embodiments are preferably implemented in software, implementation in hardware, or a combination of software and hardware, is also possible and contemplated.

[0091] Figure 9 This is a structural block diagram of a frequency selection device for shortwave communication according to an embodiment of the present invention. Figure 9 As shown, it includes: a frequency selection interval acquisition module 901, a probability density function generation module 902 and a frequency point generation module 903. The structure is described below.

[0092] The frequency selection interval acquisition module 901 is configured to determine a primary frequency selection interval based on the optimal operating frequency FOT of the current link, a link reliability threshold, and a frequency availability threshold. The primary frequency selection interval includes a high-quality frequency band and a suboptimal frequency band. The suboptimal frequency band includes a first-optimal frequency band and a second-optimal frequency band. The first-optimal frequency band, the high-quality frequency band, and the second-optimal frequency band increase in order of frequency.

[0093] The probability density function generation module 902 is used to construct the first weight corresponding to the high-quality frequency band according to the high-quality frequency band, the first-time high-quality frequency band, and the second-time high-quality frequency band. The first probability density function, the second weight corresponding to the first optimal frequency band The second probability density function and the third weight corresponding to the second optimal frequency band The third probability density function, assuming that the first probability density function obeys uniform distribution, the second probability density function and the third probability density function obey Gaussian distribution, according to the probability density function is continuous and the probability density function integral is 1, calculate the first weight , the first probability density function, the second weight , the second probability density function, the third weight and the third probability density function;

[0094] The frequency point generating module 903 is used to obtain the preselected frequency according to the probability density function of the frequency distribution, and use the center frequency point corresponding to the channel number closest to the preselected frequency as the frequency point for the current shortwave communication selection.

[0095] In one embodiment, obtaining a frequency selection interval module includes:

[0096] An optimal link reliability calculation unit is used to obtain the optimal operating frequency of the current link and calculate the optimal link reliability corresponding to the optimal operating frequency based on the optimal operating frequency;

[0097] A fixed frequency setting unit, used for setting a fixed frequency;

[0098] determining a high-quality frequency band unit, configured to obtain a plurality of first intermediate frequencies from the optimal operating frequency toward a lower frequency at fixed frequency intervals, calculate the link reliability of each of the first intermediate frequencies, until a last first intermediate frequency having a link reliability lower than a link reliability high-quality threshold is obtained, and use the last first intermediate frequency having a link reliability not lower than the link reliability high-quality threshold as the lowest frequency of the high-quality frequency band, and use the optimal operating frequency as the highest frequency of the high-quality frequency band;

[0099] Determine a first optimal frequency band unit, which is used to obtain multiple second intermediate frequencies from the lowest frequency of the high-quality frequency band toward the lower frequency direction at fixed frequency intervals, calculate the link reliability of each first intermediate frequency, until a last second intermediate frequency with a link reliability lower than a link reliability suboptimal threshold is obtained, and use the last second intermediate frequency with a link reliability not lower than the link reliability suboptimal threshold as the lowest frequency of the first optimal frequency band, and use the lowest frequency of the high-quality frequency band as the highest frequency of the first optimal frequency band;

[0100] Determine a second optimal frequency band unit for obtaining multiple third intermediate frequencies from the optimal operating frequency toward a high frequency direction at fixed frequency intervals, calculate the link reliability and frequency availability of each third intermediate frequency, until a last third intermediate frequency is obtained whose link reliability is lower than a suboptimal reliability threshold or whose frequency availability is lower than a suboptimal frequency availability threshold, and use the last third intermediate frequency whose link reliability is not lower than the suboptimal reliability threshold and whose frequency availability is not lower than the suboptimal frequency availability threshold as the highest frequency of the second optimal frequency band, and use the optimal operating frequency as the lowest frequency of the second optimal frequency band.

[0101] In one embodiment, the fixed frequency setting unit is used to determine the size of the fixed frequency according to the calculation time and calculation accuracy required by the frequency selection method.

[0102] In one embodiment, obtaining a frequency selection interval module includes:

[0103] A frequency selection band range calculation unit is used to calculate the start and end frequencies of the best frequency band, the first best frequency band, and the second best frequency band according to the link reliability best threshold and the suboptimal threshold, and the frequency availability suboptimal threshold;

[0104] a bandwidth calculation unit, configured to respectively calculate a bandwidth a of the premium frequency band, a bandwidth b of the first premium frequency band, and a bandwidth c of the second premium frequency band, wherein the bandwidth is the highest frequency of the frequency band minus the lowest frequency of the same frequency band;

[0105] A probability density function construction unit is used to construct a first weight corresponding to the high-quality frequency band through the bandwidth a of the high-quality frequency band The first probability density function of the first optimal frequency band is constructed by the bandwidth b of the first optimal frequency band. The second probability density function of the second optimal frequency band is constructed by the bandwidth c of the second optimal frequency band. The third probability density function of ;

[0106] The first relationship determination unit is used to construct a second weight according to the continuity of the first probability density function of the high-quality frequency band and the second probability density function of the first-order optimal frequency band. With the first weight The relationship: ,in, is the first weight, is the second weight, K is a constant, a is the bandwidth of the high-quality frequency band, and b is the bandwidth of the first-time high-quality frequency band;

[0107] The second relationship determination unit is used to construct a third weight according to the continuity of the first probability density function of the high-quality frequency band and the third probability density function of the second-best frequency band. With the first weight The relationship: ,in, is the first weight, is the third weight, K is a constant, a is the bandwidth of the high-quality frequency band, and c is the bandwidth of the second-highest frequency band;

[0108] A weight calculation unit is used to calculate the second weight With the first weight The relationship between the second weight With the first weight The relationship and the first weight , the second weight and the third weight The sum is 1, and the first weight A and the second weight are obtained. and the third weight ,in, , , .

[0109] In one embodiment, the probability density function construction unit is used to assume that the probability within the high-quality frequency band obeys a uniform distribution, and the first weight corresponding to the high-quality frequency band is The first probability density function ,in, is the first probability density function, is the optimal operating frequency, ≤ the frequency of the first probability density function ≤ , is the lowest frequency of the high-quality frequency band, and a is the bandwidth of the high-quality frequency band.

[0110] In one embodiment, the probability density function construction unit is further configured to assume that the probability within the first optimal frequency band obeys the mean , the mean square error is The second weight is The second probability density function ,in, is the second probability density function, mean square error , is the highest frequency of the first optimal frequency band, is the lowest frequency of the first optimal frequency band, and the frequency x of the second probability density function is < , is a natural constant; assuming that the probability in the second optimal frequency band obeys the mean , the mean square error is The Gaussian distribution of The third probability density ,in, is the third probability density function, mean square error , is the optimal operating frequency, is the highest frequency of the second optimal frequency band, and the frequency x of the third probability density function is .

[0111] In one embodiment, the frequency point generation module includes:

[0112] Random number generation unit, used to generate random numbers y , where the random number y lies between [0, 1];

[0113] The first preselected frequency generation unit is used to generate a random number if 0≤ y <Second weight B , set the mean to the highest frequency of the first optimal frequency band, the mean square error The Gaussian distribution of generates a new frequency point as the pre-selected frequency generated this time. If the pre-selected frequency is less than the highest frequency of the first optimal frequency band and greater than or equal to the lowest frequency of the first optimal frequency band, the frequency selection operation is terminated. If not, a new pre-selected frequency is generated.

[0114] The second preselected frequency generating unit is used for 1-third weight C <Random number y ≤1, the mean is the optimal operating frequency, mean square error The Gaussian distribution generates a new frequency point as the pre-selected frequency generated this time. If the pre-selected frequency is greater than the lowest frequency of the second optimal frequency band and less than or equal to the highest frequency of the second optimal frequency band, the frequency selection operation is terminated. If not, a new pre-selected frequency is generated.

[0115] The third preselected frequency generation unit is used for the second weight B≤random number y ≤1-third weight C , a random number is generated in the high-quality frequency band according to uniform distribution as the pre-selected frequency this time.

[0116] The embodiments of the present invention achieve the following technical effects:

[0117] The shortwave communication frequency selection method of the embodiment of the present application performs frequency selection under the dual constraints of link reliability and frequency availability, performs frequency selection according to a uniform distribution model in a high-quality frequency selection band with good link reliability and frequency availability, and performs frequency selection according to a quasi-Gaussian distribution model in a sub-preferred frequency band adjacent to the high-quality frequency selection band with partially reduced link reliability or frequency availability, and the probability of frequency generation is higher the closer to the high-quality frequency band; the frequency selection method does not directly use FOT for link detection, which ensures the security of frequency use to a certain extent, and the link reliability and frequency availability of the selected frequency are both well guaranteed; the frequency selection is highly targeted, avoiding the invalid occupation of the shortwave channel by blind frequency selection; the link reliability and frequency availability of the frequency points selected using the shortwave communication frequency selection method of the embodiment of the present application are well guaranteed, and at the same time, the detection frequency is randomized, thereby improving the security of frequency use.

[0118] Obviously, those skilled in the art should understand that the various modules or steps of the above-mentioned embodiments of the present invention can be implemented using a general-purpose computing device, they can be concentrated on a single computing device, or distributed across a network composed of multiple computing devices. Alternatively, they can be implemented using program code executable by the computing device, so that they can be stored in a storage device and executed by the computing device. In some cases, the steps shown or described can be performed in a different order than herein, or they can be made into separate integrated circuit modules, or multiple modules or steps can be made into a single integrated circuit module for implementation. Thus, the embodiments of the present invention are not limited to any specific combination of hardware and software.

[0119] The foregoing description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention are intended to be within the scope of protection of the present invention.

Claims

1. A frequency selection method for shortwave communication, characterized in that: include: The primary frequency selection interval is determined based on the optimal operating frequency FOT of the current link, the link reliability high-quality threshold, the link reliability suboptimal threshold, and the frequency availability suboptimal threshold. The primary frequency selection interval includes a high-quality frequency band and a suboptimal frequency band. The suboptimal frequency band includes a first-optimal frequency band and a second-optimal frequency band. The first-optimal frequency band, the high-quality frequency band, and the second-optimal frequency band increase in order of frequency. Construct the first weight corresponding to the high-quality frequency band according to the high-quality frequency band, the first-time high-quality frequency band and the second-time high-quality frequency band The first probability density function, the second weight corresponding to the first optimal frequency band The second probability density function and the third weight corresponding to the second optimal frequency band The third probability density function, assuming that the first probability density function obeys uniform distribution, the second probability density function and the third probability density function obey Gaussian distribution, according to the probability density function is continuous and the probability density function integral is 1, calculate the first weight , the first probability density function, the second weight , the second probability density function, the third weight and the third probability density function ， The method includes: calculating the bandwidth a of the high-quality frequency band, the bandwidth b of the first-time high-quality frequency band, and the bandwidth c of the second-time high-quality frequency band, wherein the bandwidth is the highest frequency of the frequency band minus the lowest frequency of the same frequency band; constructing the first weight corresponding to the high-quality frequency band through the bandwidth a of the high-quality frequency band The first probability density function of the first optimal frequency band is constructed by the bandwidth b of the first optimal frequency band. The second probability density function of the second optimal frequency band is constructed by the bandwidth c of the second optimal frequency band. The third probability density function of the high-quality frequency band; According to the continuity of the first probability density function of the high-quality frequency band and the second probability density function of the first-time high-quality frequency band, the second weight is constructed With the first weight The relationship: ; According to the continuity of the first probability density function of the high-quality frequency band and the third probability density function of the second-best frequency band, the third weight is constructed With the first weight The relationship: , where K is a constant; according to the second weight With the first weight The relationship between the third weight With the first weight The relationship between the first weight , the second weight and the third weight The sum is 1, and the first weight A and the second weight are obtained. and the third weight ,in, , , ; The preselected frequency is obtained according to the first probability density function, the second probability density function, and the third probability density function, and the center frequency corresponding to the channel number closest to the preselected frequency is used as the frequency for the current shortwave communication frequency selection.

2. The frequency selection method for shortwave communication according to claim 1, wherein: The main frequency selection interval is determined based on the optimal operating frequency FOT of the current link, the link reliability high-quality threshold, the link reliability suboptimal threshold, and the frequency availability suboptimal threshold, including: Obtaining an optimal operating frequency FOT of the current link, and calculating a link reliability corresponding to the optimal operating frequency FOT according to the optimal operating frequency FOT; Set a fixed frequency; At intervals of the fixed frequency, a plurality of first intermediate frequencies are obtained from the optimal operating frequency FOT toward lower frequencies, and the link reliability of each of the first intermediate frequencies is calculated until a last first intermediate frequency having a link reliability lower than a high-quality threshold is obtained, and the last first intermediate frequency having a link reliability not lower than the high-quality threshold is used as the lowest frequency of the high-quality frequency band, and the optimal operating frequency FOT is used as the highest frequency of the high-quality frequency band; At intervals of the fixed frequency, from the lowest frequency of the high-quality frequency band toward lower frequencies, a plurality of second intermediate frequencies are obtained, and the link reliability of each of the second intermediate frequencies is calculated until a last second intermediate frequency having a link reliability lower than a suboptimal link reliability threshold is obtained, and the last second intermediate frequency having a link reliability not lower than the suboptimal link reliability threshold is used as the lowest frequency of the first optimal frequency band, and the lowest frequency of the high-quality frequency band is used as the highest frequency of the first optimal frequency band; Taking the fixed frequency as an interval, multiple third intermediate frequencies are obtained from the optimal operating frequency FOT toward a high frequency direction, and the link reliability and frequency availability of each of the third intermediate frequencies are calculated until a last third intermediate frequency is obtained whose link reliability is lower than a link reliability suboptimal threshold or whose frequency availability is lower than a frequency availability suboptimal threshold. The last third intermediate frequency whose link reliability is not lower than the link reliability suboptimal threshold and whose frequency availability is not lower than the frequency availability suboptimal threshold is used as the highest frequency of the second optimal frequency band, and the optimal operating frequency FOT is used as the lowest frequency of the second optimal frequency band.

3. The frequency selection method for shortwave communication according to claim 2, wherein: The fixed frequency is determined according to the calculation time and calculation accuracy required by the frequency selection method.

4. The frequency selection method for shortwave communication according to claim 1, wherein: The first weight corresponding to the high-quality frequency band is constructed by using the bandwidth a of the high-quality frequency band The first probability density function includes: Assuming that the frequency distribution probability density within the high-quality frequency band obeys a uniform distribution, the first weight corresponding to the high-quality frequency band is The first probability density function ,in, ≤ the frequency of the first probability density function ≤ , is the lowest frequency of the premium frequency band.

5. The frequency selection method for shortwave communication according to claim 1, wherein: The second weight corresponding to the first optimal frequency band is constructed by using the bandwidth b of the first optimal frequency band The second probability density function of the second optimal frequency band is constructed by the bandwidth c of the second optimal frequency band. The third probability density function includes: Assume that the frequency distribution probability density in the first optimal frequency band obeys the mean , the mean square error is The second weight is The second probability density function , where the mean square error , is the highest frequency of the first optimal frequency band, is the lowest frequency of the first optimal frequency band, and the frequency x of the second probability density function is less than , is a natural constant; Assume that the frequency distribution probability density in the second optimal frequency band follows the mean , the mean square error is Gaussian distribution, then the third weight The third probability density , where the mean square error , is the highest frequency of the second optimal frequency band, and the frequency x of the third probability density function> .

6. The frequency selection method for shortwave communication according to any one of claims 1 to 5, characterized in that: Obtaining the preselected frequency according to the first probability density function, the second probability density function, and the third probability density function includes: Generate random numbers y , wherein the random number y lies between [0, 1]; If 0≤the random number y <The second weight , using the mean as the highest frequency of the first optimal frequency band, the mean square error The Gaussian distribution generates a new frequency as the pre-selected frequency generated this time. If the pre-selected frequency is less than the highest frequency of the first optimal frequency band and greater than or equal to the lowest frequency of the first optimal frequency band, the frequency selection operation is terminated. If not, the pre-selected frequency is regenerated. If 1-the third weight <The random number y ≤1, using the mean as the optimal operating frequency FOT, mean square error The Gaussian distribution generates a new frequency as the pre-selected frequency generated this time. If the pre-selected frequency is greater than the lowest frequency of the second optimal frequency band and less than or equal to the highest frequency of the second optimal frequency band, the frequency selection operation is terminated. If not, the pre-selected frequency is regenerated. The second weight ≤ the random number y ≤1-the third weight , a random number is generated in the high-quality frequency band according to a uniform distribution as the pre-selected frequency this time.

7. A frequency selection device for shortwave communication, characterized in that: include: The frequency selection interval acquisition module is used to determine the main frequency selection interval based on the optimal operating frequency FOT of the current link, the link reliability high-quality threshold, the link reliability suboptimal threshold, and the frequency availability suboptimal threshold. The main frequency selection interval includes a high-quality frequency band and a suboptimal frequency band. The suboptimal frequency band includes a first-optimal frequency band and a second-optimal frequency band. The first-optimal frequency band, the high-quality frequency band, and the second-optimal frequency band increase in order of frequency size. The probability density function generation module is used to construct the first weight corresponding to the high-quality frequency band according to the optimal operating frequency, high-quality frequency band, first-time high-quality frequency band, and second-time high-quality frequency band. The first probability density function, the second weight corresponding to the first optimal frequency band The second probability density function and the third weight corresponding to the second optimal frequency band The third probability density function, assuming that the first probability density function obeys uniform distribution, the second probability density function and the third probability density function obey Gaussian distribution, according to the probability density function is continuous and the probability density function integral is 1, calculate the first weight , the first probability density function, the second weight , the second probability density function, the third weight and the third probability density function; Probability density function generation module, including: a bandwidth calculation unit, configured to respectively calculate a bandwidth a of the premium frequency band, a bandwidth b of the first premium frequency band, and a bandwidth c of the second premium frequency band, wherein the bandwidth is the highest frequency of the frequency band minus the lowest frequency of the same frequency band; A probability density function construction unit is used to construct a first weight corresponding to the high-quality frequency band through the bandwidth a of the high-quality frequency band The first probability density function of the first optimal frequency band is constructed by the bandwidth b of the first optimal frequency band. The second probability density function of the second optimal frequency band is constructed by the bandwidth c of the second optimal frequency band. The third probability density function of ; The first relationship determination unit is used to construct a second weight according to the continuity of the first probability density function of the high-quality frequency band and the second probability density function of the first-order optimal frequency band. With the first weight The relationship: ; The second relationship determination unit is used to construct a third weight according to the continuity of the first probability density function of the high-quality frequency band and the third probability density function of the second-best frequency band. With the first weight The relationship: , where K is a constant; A weight calculation unit is used to calculate the second weight With the first weight The relationship between the second weight With the first weight The relationship and the first weight , the second weight and the third weight The sum is 1, and the first weight A and the second weight are obtained. and the third weight ,in, , , ; The frequency point generation module is used to obtain the preselected frequency according to the first probability density function, the second probability density function, and the third probability density function, and use the center frequency point corresponding to the channel number closest to the preselected frequency as the frequency point for this shortwave communication selection.

8. A computer device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein: When the processor executes the computer program, the frequency selection method for shortwave communication according to any one of claims 1 to 6 is implemented.

9. A computer-readable storage medium, characterized in that The computer-readable storage medium stores a computer program for executing the frequency selection method for shortwave communication according to any one of claims 1 to 6.

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