Method, device and apparatus for detecting narrowband interference signal in spread spectrum signal

Abstract

The present invention provides a method, device and equipment for detecting narrowband interference signals in spread spectrum signals. The method comprises: dividing the main lobe bandwidth of the spread spectrum signal into an even number of sub-bandwidths on average; dividing all the sub-bandwidths on average into two groups based on the arrangement order of each sub-bandwidth after division to obtain a first sub-bandwidth set and a second sub-bandwidth set; adding power spectra belonging to the same sub-bandwidth to obtain the power of each sub-bandwidth; making one-to-one correspondence between each sub-bandwidth of the first sub-bandwidth set and the second sub-bandwidth set based on the arrangement order of each sub-bandwidth in the first sub-bandwidth set and the second sub-bandwidth set to obtain a plurality of sub-bandwidth groups; determining the power of the corresponding sub-bandwidth group based on the power of each sub-bandwidth in each sub-bandwidth group; detecting the narrowband interference signal based on the power of each sub-bandwidth group, thereby accurately detecting the narrowband interference signal and avoiding the technical problem of misdetection of the narrowband interference signal in the spread spectrum communication system.

Description

Technical Field

[0001] The present invention relates to the field of wireless communication technology, and in particular to a method, device and equipment for detecting narrowband interference signals in spread spectrum signals. Background Art

[0002] In wireless communication systems, the direct sequence spread spectrum system is widely used due to its good concealed transmission characteristics. However, in the current complex electromagnetic environment, since the bandwidth of the spread spectrum signal is usually wide, there may be unintentional or malicious narrowband interference signals in the band, affecting the normal transmission of the spread spectrum signal. Therefore, it is necessary to detect narrowband interference on the spread spectrum signal bandwidth in order to eliminate narrowband interference and improve the transmission efficiency of the spread spectrum system (a system that uses the direct sequence spread spectrum system for signal transmission).

[0003] Traditional narrowband interference detection methods often use power spectrum mean and variance for detection. However, the above detection method requires that the power spectrum of the useful signal has a completely flat characteristic. However, the spread spectrum signal spectrum is not completely flat. For example, the power ratio of the useful signal center point is the peak point, and the power spectrum value gradually decreases from the center point to the edge of the main lobe. In view of the above signal spectrum characteristics, if the traditional narrowband interference detection method is sampled, when the threshold is set low, it is easy to mistakenly detect the useful signal as an interference signal. When the threshold is set high, it is easy to cause narrowband interference to be missed, and then the interference cannot be effectively eliminated, affecting system performance. Summary of the invention

[0004] The present invention provides a method, device and equipment for detecting a narrowband interference signal in a spread spectrum signal, so as to solve the technical problem in the prior art that the narrowband interference signal in the spread spectrum signal cannot be accurately detected.

[0005] On the one hand, the present invention provides a method for detecting a narrowband interference signal in a spread spectrum signal, comprising:

[0006] Divide the main lobe bandwidth of the spread spectrum signal into an even number of sub-bandwidths;

[0007] Based on the arrangement order of the sub-bandwidths after being divided, all the sub-bandwidths are equally divided into two groups to obtain a first sub-bandwidth set and a second sub-bandwidth set;

[0008] Adding the power spectra belonging to the same sub-bandwidth to obtain the power of each sub-bandwidth;

[0009] Based on the arrangement order of each sub-bandwidth in the first group of sub-bandwidth sets and the second group of sub-bandwidth sets, one-to-one correspondence is made between each sub-bandwidth in the first group of sub-bandwidth sets and the second group of sub-bandwidth sets to obtain a plurality of sub-bandwidth groups;

[0010] Determine the power size of the corresponding sub-bandwidth group based on the power size of each sub-bandwidth in each sub-bandwidth group;

[0011] Based on the power of each of the sub-bandwidth groups, a narrowband interference signal is detected.

[0012] According to a method for detecting a narrowband interference signal in a spread spectrum signal provided by the present invention, the narrowband interference signal is detected based on the power of each sub-bandwidth group, comprising:

[0013] Determine the maximum power and the minimum power among the powers of each of the sub-bandwidth groups;

[0014] Based on the numerical relationship between the maximum power and the minimum power, a narrowband interference signal is detected.

[0015] According to a method for detecting a narrowband interference signal in a spread spectrum signal provided by the present invention, the detecting of the narrowband interference signal based on the numerical relationship between the maximum power and the minimum power includes:

[0016] determining a power difference between the maximum power and the minimum power;

[0017] When the power difference is greater than a preset threshold, it is determined that a narrowband interference signal exists.

[0018] According to a method for detecting a narrowband interference signal in a spread spectrum signal provided by the present invention, the detecting of the narrowband interference signal based on the numerical relationship between the maximum power and the minimum power includes:

[0019] determining a power ratio of the maximum power to the minimum power;

[0020] When the power ratio is greater than a preset ratio, it is determined that a narrowband interference signal exists.

[0021] According to a method for detecting a narrowband interference signal in a spread spectrum signal provided by the present invention, the main lobe bandwidth of the spread spectrum signal is evenly divided into an even number of sub-bandwidths, comprising:

[0022] Sampling the spread spectrum signal based on a preset sampling rate to obtain a spread spectrum sampling signal;

[0023] The main lobe bandwidth of the spread spectrum sampling signal is evenly divided into an even number of sub-bandwidths.

[0024] According to a method for detecting a narrowband interference signal in a spread spectrum signal provided by the present invention, before sampling the spread spectrum signal based on a preset sampling rate, the method further includes:

[0025] The spread spectrum signal is subjected to binary phase shift keying processing.

[0026] According to a method for detecting a narrowband interference signal in a spread spectrum signal provided by the present invention, the time domain signal of the spread spectrum signal is:

[0027] , where t is time, s(t) is the time-domain signal expression that changes with time, is the signal amplitude, d(t) is the effective transmission information that varies with time, c(t) is the spread spectrum code signal that varies with time, is the carrier frequency.

[0028] According to a method for detecting a narrowband interference signal in a spread spectrum signal provided by the present invention, the 100kbps, 4Mcps, is 20MHz.

[0029] On the other hand, the present invention also provides a device for detecting a narrowband interference signal in a spread spectrum signal, comprising:

[0030] A bandwidth division module, used for evenly dividing the main lobe bandwidth of the spread spectrum signal into an even number of sub-bandwidths;

[0031] A grouping module, configured to equally divide all the sub-bandwidths into two groups based on the arrangement order of the sub-bandwidths after being divided, to obtain a first sub-bandwidth set and a second sub-bandwidth set;

[0032] A first power determination module, which adds power spectra belonging to the same sub-bandwidth to obtain power of each sub-bandwidth;

[0033] a bandwidth correspondence module, based on the arrangement order of each sub-bandwidth in the first group of sub-bandwidth sets and the second group of sub-bandwidth sets, making one-to-one correspondence between each sub-bandwidth in the first group of sub-bandwidth sets and the second group of sub-bandwidth sets, to obtain a plurality of sub-bandwidth groups;

[0034] A second power determination module, based on the power of each of the sub-bandwidths in each of the sub-bandwidth groups, determines the power of the corresponding sub-bandwidth group;

[0035] The interference detection module is used to detect narrowband interference signals based on the power of each of the sub-bandwidth groups.

[0036] On the other hand, the present invention also provides an electronic 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 program, a method for detecting a narrowband interference signal in any of the above-mentioned spread spectrum signals is implemented.

[0037] The present invention provides a method, device and apparatus for detecting narrowband interference signals in spread spectrum signals, which evenly divide the main lobe bandwidth of the spread spectrum signal into an even number of sub-bandwidths, and based on the arrangement order of each of the sub-bandwidths after division, evenly divide all of the sub-bandwidths into two groups to obtain a first sub-bandwidth set and a second sub-bandwidth set; add each power spectrum belonging to the same sub-bandwidth to obtain the power of each sub-bandwidth; based on the arrangement order of each sub-bandwidth in the first sub-bandwidth set and the second sub-bandwidth set, one-to-one correspondence is made between each sub-bandwidth in the first sub-bandwidth set and the second sub-bandwidth set to obtain to multiple sub-bandwidth groups; based on the power size of each sub-bandwidth in each sub-bandwidth group, determine the power size of the corresponding sub-bandwidth group; based on the power size of each sub-bandwidth group, detect narrowband interference signals, and make full use of the bilateral symmetry characteristics of the spread spectrum signal power spectrum (the power sizes of the sub-bandwidth groups are basically the same), so that narrowband interference signals can be accurately detected, and the problems of difficult setting of narrowband interference detection thresholds and easy false detection and missed detection in traditional spread spectrum communication systems are solved, laying the foundation for the subsequent correct elimination of narrowband interference, so as to improve the reliability and transmission efficiency of spread spectrum signal anti-interference processing. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0039] Figure 1 It is a flow chart of a method for detecting a narrowband interference signal in a spread spectrum signal provided by an embodiment of the present invention;

[0040] Figure 2 is a schematic diagram of a power spectrum of a sub-bandwidth of a spread spectrum signal without superimposed narrowband interference provided by an embodiment of the present invention;

[0041] Figure 3 is a schematic diagram of a power spectrum of a sub-bandwidth of a spread spectrum signal superimposed with narrowband interference provided by an embodiment of the present invention;

[0042] Figure 4 is a schematic diagram of a spread spectrum signal, effective transmission information and a spread spectrum code signal provided by an embodiment of the present invention;

[0043] Figure 5 is a schematic diagram of a spread spectrum signal power spectrum when there is no interference provided by an embodiment of the present invention;

[0044] Figure 6 is a schematic diagram of normalized power spectra of various sections when there is no interference provided by an embodiment of the present invention;

[0045] Figure 7 1 is a schematic diagram of a power spectrum of a spread spectrum signal with a superimposed interference-to-signal ratio of 1 dB narrowband interference provided by an embodiment of the present invention;

[0046] Figure 8 It is a schematic diagram of normalized power spectra of various sections when the interference-to-signal ratio is 1 dB provided by an embodiment of the present invention;

[0047] Fig. 9 1 is a schematic diagram of a power spectrum of a spread spectrum signal with a superimposed interference-to-signal ratio of 10 dB narrowband interference provided by an embodiment of the present invention;

[0048] Fig.10 1 is a schematic diagram of normalized power spectra of various sections when the interference-to-signal ratio is 10 dB provided by an embodiment of the present invention;

[0049] Fig.11 It is a schematic diagram of the structure of a device for detecting a narrowband interference signal in a spread spectrum signal provided by an embodiment of the present invention;

[0050] Fig.12 It is a schematic diagram of the structure of an electronic device provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0051] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the drawings of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0052] Figure 1 1 is a flow chart of a method for detecting a narrowband interference signal in a spread spectrum signal provided by an embodiment of the present invention. The execution subject of the detection method may be a computer, a mobile phone or a smart wearable device.

[0053] like Figure 1 As shown, the method for detecting a narrowband interference signal in a spread spectrum signal may mainly include the following steps 101 to 106.

[0054] 101. Divide the main lobe bandwidth of the spread spectrum signal into an even number of sub-bandwidths.

[0055] In this step, the spread spectrum signal may refer to a signal after the spectrum of the effective transmission signal (baseband signal) is extended to a wider frequency range, which can improve the anti-interference and security of the signal. The spread spectrum signal may be a direct sequence spread spectrum signal. The average here indicates that the frequency interval size of each sub-bandwidth is consistent. The main lobe bandwidth is the width of the area where the main energy in the signal spectrum is concentrated, and can be defined according to actual conditions. For example, the main lobe bandwidth of the spread spectrum signal can be defined as 2 times the spread spectrum code rate, and the side lobe bandwidth can be defined as equal to the spread spectrum code rate. Of course, other methods can also be used to define it.

[0056] 102. Based on the arrangement order of the divided sub-bandwidths, all the sub-bandwidths are equally divided into two groups to obtain a first sub-bandwidth set and a second sub-bandwidth set.

[0057] In this step, the total number of sub-bandwidths after division can be represented by n, for example, n is 20. According to the arrangement order of the sub-bandwidths after division, for example, from left to right, the first to tenth sub-bandwidths can be used as the first group of sub-bandwidth sets, and the eleventh to twentieth sub-bandwidths can be used as the second group of sub-bandwidth sets. According to the arrangement order of the sub-bandwidths after division, the sub-bandwidths can be numbered, for example, see Figure 2 and Figure 3 , Figure 2 Can Figure 5 correspond, Figure 3 Can Figure 7 Correspondingly, from left to right, they are numbered as f1a, f2a, f3a, f4a, f5a, f6a, f7a, f8a, f9a, f10a, f1b, f2b, f3b, f4b, f5b, f6b, f7b, f8b, f9b, and f10b. f1a to f10a are the first group of sub-bandwidth sets. f1b to f10b are the second group of sub-bandwidth sets.

[0058] 103. Add the power spectra belonging to the same sub-bandwidth to obtain the power of each sub-bandwidth.

[0059] In this step, a normalized power spectrum of the spread spectrum signal may be obtained by normalization processing, thereby obtaining the power of each sub-bandwidth.

[0060] 104. Based on the arrangement order of each sub-bandwidth in the first sub-bandwidth set and the second sub-bandwidth set, make one-to-one correspondence between each sub-bandwidth in the first sub-bandwidth set and the second sub-bandwidth set to obtain a plurality of sub-bandwidth groups.

[0061] In this step, continue to see Figure 2 and Figure 3, the arrangement order of each sub-bandwidth in the first sub-bandwidth set is f1a to f10a. The arrangement order of each sub-bandwidth in the second sub-bandwidth set is f1b to f10b. Based on the above arrangement order, f1a corresponds to f1b, f2a corresponds to f2b, and so on, f10a corresponds to f10b, thereby obtaining 10 sub-bandwidth groups.

[0062] 105. Determine a power size of a corresponding sub-bandwidth group based on a power size of each sub-bandwidth in each sub-bandwidth group.

[0063] In this step, the powers of the two sub-bandwidths in the sub-bandwidth group are added together to obtain the power of the sub-bandwidth group. For example, the power corresponding to sub-bandwidth f1a can be expressed as pow1a, the power corresponding to sub-bandwidth f2a can be expressed as pow2a, and so on, the power corresponding to sub-bandwidth f10a can be expressed as pow10a. Similarly, the power corresponding to sub-bandwidth f1b can be expressed as pow1b, the power corresponding to sub-bandwidth f2b can be expressed as pow2b, and so on, the power corresponding to sub-bandwidth f10b can be expressed as pow10b. The power of the sub-bandwidth group formed by sub-bandwidth f1a and sub-bandwidth f1b can be expressed as pow1a+pow1b; the power of the sub-bandwidth group formed by sub-bandwidth f2a and sub-bandwidth f2b can be expressed as pow2a+pow2b; and so on, the power of the sub-bandwidth group formed by sub-bandwidth f10a and sub-bandwidth f10b can be expressed as pow10a+pow10b.

[0064] based on Figure 2 It can be seen that when there is no superimposed narrowband interference, the power of each sub-bandwidth changes relatively slowly, so the difference between the powers of each sub-bandwidth group is relatively small. Figure 3 It can be seen that when narrowband interference is superimposed, the power of f10a and f1b is obviously larger (the top of the curve is higher). Therefore, the power pow1a+pow1b of the sub-bandwidth group formed by sub-bandwidth f1a and sub-bandwidth f1b, and the power pow10a+pow10b of the sub-bandwidth group formed by sub-bandwidth f10a and sub-bandwidth f10b are significantly different from the power of other sub-bandwidth groups.

[0065] 106. Detect narrowband interference signals based on power of each sub-bandwidth group.

[0066] In this embodiment, the main lobe bandwidth of the spread spectrum signal is evenly divided into an even number of sub-bandwidths, and based on the arrangement order of each of the sub-bandwidths after the division, all of the sub-bandwidths are evenly divided into two groups to obtain a first sub-bandwidth set and a second sub-bandwidth set; each power spectrum belonging to the same sub-bandwidth is added to obtain the power of each sub-bandwidth; based on the arrangement order of each sub-bandwidth in the first sub-bandwidth set and the second sub-bandwidth set, each sub-bandwidth of the first sub-bandwidth set and the second sub-bandwidth set is matched one-to-one to obtain multiple sub-bandwidth groups; based on the power size of each sub-bandwidth in each sub-bandwidth group, the power size of the corresponding sub-bandwidth group is determined; based on the power size of each sub-bandwidth group, the narrowband interference signal is detected. This embodiment makes full use of the bilateral symmetry of the power spectrum of the spread spectrum signal (the power size of the sub-bandwidth group is basically the same), realizes the accurate detection of the narrowband interference signal, solves the problem that the narrowband interference detection threshold is difficult to set, and is easy to be misdetected and missed in the traditional spread spectrum communication system, and lays the foundation for the subsequent correct elimination of narrowband interference, so as to improve the reliability and transmission efficiency of the spread spectrum signal anti-interference processing.

[0067] In an embodiment of the present specification, the detecting of the narrowband interference signal based on the power of each of the sub-bandwidth groups may include:

[0068] Determine the maximum power and the minimum power among the powers of each of the sub-bandwidth groups;

[0069] Based on the numerical relationship between the maximum power and the minimum power, a narrowband interference signal is detected.

[0070] In this embodiment, considering that there is no narrowband interference signal in the spread spectrum signal, the power of each sub-bandwidth group is basically the same. Therefore, the narrowband interference signal can be detected based on the numerical relationship between the maximum power and the minimum power. This detection method has high accuracy.

[0071] In an embodiment of the present specification, the detecting of the narrowband interference signal based on the numerical relationship between the maximum power and the minimum power may include:

[0072] determining a power difference between the maximum power and the minimum power;

[0073] When the power difference is greater than a preset threshold, it is determined that a narrowband interference signal exists.

[0074] In this embodiment, the preset threshold value can be set, and no specific limitation is made here. Considering the bilateral symmetry characteristics of the spread spectrum signal power spectrum, the power size of each sub-bandwidth group is basically the same. Therefore, the power difference between the maximum power and the minimum power is determined. When the power difference is greater than the preset threshold value, it is determined that there is a narrowband interference signal. This detection method is very accurate and can avoid false detection and missed detection. In addition, when the power difference is less than or equal to the preset threshold value, it is determined that there is no narrowband interference signal.

[0075] In an embodiment of the present specification, the detecting of the narrowband interference signal based on the numerical relationship between the maximum power and the minimum power may include:

[0076] determining a power ratio of the maximum power to the minimum power;

[0077] When the power ratio is greater than a preset ratio, it is determined that a narrowband interference signal exists.

[0078] In this embodiment, the preset ratio can be set, and no specific limitation is made here. Considering the bilateral symmetry characteristics of the spread spectrum signal power spectrum, the power size of each sub-bandwidth group is basically the same. Therefore, the power ratio of the maximum power and the minimum power is determined. When the power ratio is greater than the preset ratio, it is determined that there is a narrowband interference signal. This detection method is very accurate and can avoid false detection and missed detection. In addition, when the power ratio is less than or equal to the preset ratio, it is determined that there is no narrowband interference signal.

[0079] In an embodiment of the present specification, evenly dividing the main lobe bandwidth of the spread spectrum signal into an even number of sub-bandwidths may include:

[0080] Sampling the spread spectrum signal based on a preset sampling rate to obtain a spread spectrum sampling signal;

[0081] The main lobe bandwidth of the spread spectrum sampling signal is evenly divided into an even number of sub-bandwidths.

[0082] In this embodiment, the spread spectrum signal is sampled based on a preset sampling rate to obtain a spread spectrum sampling signal, and the main lobe bandwidth of the spread spectrum sampling signal is evenly divided into an even number of sub-bandwidths, which can reduce the number of signals involved in the calculation and improve processing efficiency while ensuring the accuracy of the results.

[0083] In an embodiment of the present specification, before sampling the spread spectrum signal based on the preset sampling rate, the method may further include:

[0084] The spread spectrum signal is subjected to binary phase shift keying processing.

[0085] In this embodiment, binary phase shift keying (BPSK) processing is performed on the spread spectrum signal, which can improve the anti-interference capability and transmission efficiency of the processed spread spectrum signal.

[0086] In one embodiment of this specification, the time domain signal of the spread spectrum signal is:

[0087] Formula (1).

[0088] Among them, s(t) represents the time domain signal expression of the spread spectrum signal that varies with time, that is, the time domain spread spectrum signal obtained after spreading. represents the signal amplitude, d(t) represents the effective transmission information that varies with time, that is, the baseband signal before being expanded, and c(t) represents the spread spectrum code signal that varies with time. represents the carrier frequency, and t represents the time. For details, see Figure 4 , Figure 4 is a schematic diagram of a spread spectrum signal, effective transmission information and a spread spectrum code signal provided by an embodiment of the present invention, Figure 4 In the figure, the horizontal axis represents time t, and the vertical axis represents the signal values ​​of d(t), c(t) and s(t) from top to bottom.

[0089] For example, let the information rate (i.e., d(t) data update rate) Rb be 100 kbps, that is, is 100kbps; the spreading code chip rate Rc is 4Mcps, that is, 4Mcps; carrier frequency The signal shown in formula (1) is digitally sampled at a sampling rate of 80 MHz. The sampled signal does not contain narrowband interference. The power spectrum of the sampled signal can be shown as Figure 5 As shown in the figure. The main lobe bandwidth of the spread spectrum signal is twice the spread spectrum code rate, that is, 8MHz, while the power spectrum at the edge of the main lobe is reduced and is not completely flat. When there is a narrowband interference signal, the power is as follows Figure 7 or Fig. 9 shown.

[0090] For ease of understanding, the present invention is simulated and introduced through some data below. Assume that the preset threshold is 3dB. After many experiments, it is found that when the narrowband interference signal is not included, the power of each sub-bandwidth group is very close, and may not be exactly the same. Therefore, if the preset threshold is too small, it is easy to misjudge the normal signal as a narrowband interference signal. Generally, it is more reasonable to define the preset threshold as 3-6dB. If the preset threshold is too large, some narrowband interference signals may be missed. The simulation conditions are: the information rate Rb of the effective transmission information is 100kbps, the spread spectrum code chip rate Rc is 4Mcps, and the carrier frequency is The frequency band is 20MHz, the sampling rate is 80MHz, the number of FFT points is 65536, the narrowband interference bandwidth is 1MHz, that is, 1 / 8 of the useful signal bandwidth, and the number of segments is 10. Simulations are performed under three conditions: no interference, narrowband interference with an interference-to-signal ratio ISR=1dB, and narrowband interference with an interference-to-signal ratio ISR=10dB, and the average power values ​​of each segment are compared.

[0091] When no narrowband interfering signals are present, see Figure 5 and Figure 6 , Figure 5 is a schematic diagram of a spread spectrum signal power spectrum when there is no interference provided by an embodiment of the present invention; Figure 6 It is a schematic diagram of normalized power spectra of various sections when there is no interference provided by an embodiment of the present invention. Figure 5 The horizontal axis in the figure represents the frequency (Hz), for example, the range is 0-4×10 7 Hz, and the ordinate represents power POW (dB), for example, 0 to -100 dB. Figure 6 The segment number in is the number of each sub-bandwidth group, for example, 1 to 10. Figure 6 It can be seen that the power difference between each segment is less than 3dB, which does not meet the above narrowband interference detection judgment conditions and is judged as no interference.

[0092] When there is a narrowband interference signal with ISR = 1dB, see Figure 7 and Figure 8 , Figure 7 1 is a schematic diagram of a power spectrum of a spread spectrum signal with a superimposed interference-to-signal ratio of 1 dB narrowband interference provided by an embodiment of the present invention; Figure 8 It is a schematic diagram of normalized power spectra of various sections when the interference-to-signal ratio is 1 dB provided by an embodiment of the present invention. Figure 7 The horizontal axis in the figure represents the frequency (Hz), for example, the range is 0-4×10 7 , the vertical axis represents power POW (dB), for example, 0 to -100 dB. Figure 8 The segment number in is the number of each sub-bandwidth group, for example, 1 to 10. Figure 8It can be obtained that the difference between the maximum power and the minimum power in each segment is 26dB, which meets the above narrowband interference detection and judgment conditions and is determined to be interference.

[0093] When there is a narrowband interference signal with ISR = 10dB, see Fig. 9 and Fig.10 , Fig. 9 1 is a schematic diagram of a power spectrum of a spread spectrum signal with a superimposed interference-to-signal ratio of 10 dB narrowband interference provided by an embodiment of the present invention; Fig.10 It is a schematic diagram of normalized power spectra of various sections when the interference-to-signal ratio is 10 dB provided by an embodiment of the present invention. Fig. 9 The horizontal axis in the figure represents the frequency (Hz), for example, the range is 0-4×10 7 , the vertical axis represents power POW (dB), for example, 0 to -100 dB. Fig.10 The segment number in is the number of each sub-bandwidth group, for example, 1 to 10. Fig.10 It can be obtained that the difference between the maximum power and the minimum power in each segment is 39dB, which meets the above narrowband interference detection and judgment conditions and is determined to be interference. Fig.10 , Figure 8 and Figure 6 The normalized average power spectrum described in is the power of each sub-bandwidth group.

[0094] Based on the same general inventive concept, the present invention also protects a detection device for a narrowband interference signal in a spread spectrum signal, see Fig.11 . The following is a description of the detection device for narrowband interference signals in spread spectrum signals provided by the present invention. The detection device for narrowband interference signals in spread spectrum signals described below and the detection method for narrowband interference signals in spread spectrum signals described above can correspond to each other. The detection device for narrowband interference signals in spread spectrum signals may include a bandwidth division module 201, a grouping module 202, a first power determination module 203, a bandwidth corresponding module 204, a second power determination module 205 and an interference detection module 206.

[0095] The bandwidth division module 201 is used to divide the main lobe bandwidth of the spread spectrum signal into multiple sub-bandwidths on average. The grouping module 202 is used to add the power spectra belonging to the same sub-bandwidth to obtain the power of each sub-bandwidth. The first power determination module 203 is used to determine the middle sub-bandwidth located in the middle position based on the arrangement order of each sub-bandwidth after division. The bandwidth correspondence module 204 is used to correspond the sub-bandwidths on one side of the middle sub-bandwidth in the order from far to near to the middle sub-bandwidth with the sub-bandwidths on the other side of the middle sub-bandwidth in the order from near to far to obtain multiple sub-bandwidth groups. The second power determination module 205 is used to determine the power of each sub-bandwidth group. The interference detection module 206 is used to detect narrowband interference signals based on the power size of each sub-bandwidth group.

[0096] Fig.12 Schematic diagram of the structure of an electronic device provided by an embodiment of the present invention. Fig.12 As shown, the electronic device may include: a processor 610, a communication interface 620, a memory 630 and a communication bus 640, wherein the processor 610, the communication interface 620 and the memory 630 communicate with each other through the communication bus 640. The processor 610 may call the logic instructions in the memory 630 to execute the method for detecting a narrowband interference signal in a spread spectrum signal.

[0097] In addition, the logic instructions in the above-mentioned memory 630 can be implemented in the form of a software functional unit and can be stored in a computer-readable storage medium when it is sold or used as an independent product. Based on such an understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art or the part of the technical solution, can be embodied in the form of a software product, and the computer software product is stored in a storage medium, including a number of instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the method described in each embodiment of the present invention. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), disk or optical disk, etc. Various media that can store program codes.

[0098] On the other hand, the present invention also provides a computer program product, which includes a computer program. The computer program can be stored on a non-transitory computer-readable storage medium. When the computer program is executed by a processor, the computer can execute the detection method of narrowband interference signals in spread spectrum signals provided by the above methods.

[0099] On the other hand, the present invention also provides a non-transitory computer-readable storage medium having a computer program stored thereon, which is implemented when the computer program is executed by a processor to execute the method for detecting a narrowband interference signal in a spread spectrum signal provided by the above methods.

[0100] The device embodiments described above are merely illustrative, wherein the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or they may be distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the scheme of this embodiment. Ordinary technicians in this field can understand and implement it without paying creative labor.

[0101] Through the description of the above implementation methods, those skilled in the art can clearly understand that each implementation method can be implemented by means of software plus a necessary general hardware platform, and of course, can also be implemented by hardware. Based on this understanding, the above technical solution is essentially or the part that contributes to the prior art can be embodied in the form of a software product, and the computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, a disk, an optical disk, etc., including a number of instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to execute the methods described in each embodiment or some parts of the embodiments.

[0102] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for detecting a narrowband interference signal in a spread spectrum signal, characterized in that: include: Divide the main lobe bandwidth of the spread spectrum signal into an even number of sub-bandwidths; Based on the arrangement order of the sub-bandwidths after being divided, all the sub-bandwidths are equally divided into two groups to obtain a first sub-bandwidth set and a second sub-bandwidth set; Adding the power spectra belonging to the same sub-bandwidth to obtain the power of each sub-bandwidth; Based on the arrangement order of each sub-bandwidth in the first group of sub-bandwidth sets and the second group of sub-bandwidth sets, one-to-one correspondence is made between each sub-bandwidth in the first group of sub-bandwidth sets and the second group of sub-bandwidth sets to obtain a plurality of sub-bandwidth groups; Determine the power size of the corresponding sub-bandwidth group based on the power size of each sub-bandwidth in each sub-bandwidth group; Detecting narrowband interference signals based on the power of each of the sub-bandwidth groups; The detecting of narrowband interference signals based on the power of each of the sub-bandwidth groups includes: Determine the maximum power and the minimum power among the powers of each of the sub-bandwidth groups; Detecting a narrowband interference signal based on a numerical relationship between the maximum power and the minimum power; The detecting a narrowband interference signal based on the numerical relationship between the maximum power and the minimum power includes: determining a power difference between the maximum power and the minimum power; When the power difference is greater than a preset threshold, it is determined that a narrowband interference signal exists; or determining a power ratio of the maximum power to the minimum power; When the power ratio is greater than a preset ratio, it is determined that a narrowband interference signal exists.

2. The method for detecting narrowband interference signals in spread spectrum signals according to claim 1, characterized in that: The step of evenly dividing the main lobe bandwidth of the spread spectrum signal into an even number of sub-bandwidths comprises: Sampling the spread spectrum signal based on a preset sampling rate to obtain a spread spectrum sampling signal; The main lobe bandwidth of the spread spectrum sampling signal is evenly divided into an even number of sub-bandwidths.

3. The method for detecting narrowband interference signals in spread spectrum signals according to claim 2, characterized in that: Before sampling the spread spectrum signal based on the preset sampling rate, the method further includes: The spread spectrum signal is subjected to binary phase shift keying processing.

4. The method for detecting narrowband interference signals in spread spectrum signals according to claim 3, characterized in that: The time domain signal of the spread spectrum signal is: , where t is time, s(t) is the time-domain signal expression that changes with time, is the signal amplitude, d(t) is the effective transmission information that varies with time, c(t) is the spread spectrum code signal that varies with time, is the carrier frequency.

5. The method for detecting narrowband interference signals in spread spectrum signals according to claim 4, characterized in that: Said 100kbps, 4Mcps, is 20MHz.

6. A device for detecting narrowband interference signals in spread spectrum signals, characterized in that: include: A bandwidth division module, used for evenly dividing the main lobe bandwidth of the spread spectrum signal into an even number of sub-bandwidths; A grouping module, configured to equally divide all the sub-bandwidths into two groups based on the arrangement order of the sub-bandwidths after being divided, to obtain a first sub-bandwidth set and a second sub-bandwidth set; A first power determination module, which adds power spectra belonging to the same sub-bandwidth to obtain power of each sub-bandwidth; a bandwidth correspondence module, based on the arrangement order of each sub-bandwidth in the first group of sub-bandwidth sets and the second group of sub-bandwidth sets, making one-to-one correspondence between each sub-bandwidth in the first group of sub-bandwidth sets and the second group of sub-bandwidth sets, to obtain a plurality of sub-bandwidth groups; A second power determination module, based on the power of each of the sub-bandwidths in each of the sub-bandwidth groups, determines the power of the corresponding sub-bandwidth group; An interference detection module, configured to detect narrowband interference signals based on the power of each of the sub-bandwidth groups; Detecting narrowband interference signals based on the power of each of the sub-bandwidth groups includes: Determine the maximum power and the minimum power among the powers of each of the sub-bandwidth groups; Detecting a narrowband interference signal based on a numerical relationship between the maximum power and the minimum power; Detecting a narrowband interference signal based on a numerical relationship between the maximum power and the minimum power includes: determining a power difference between the maximum power and the minimum power; When the power difference is greater than a preset threshold, it is determined that a narrowband interference signal exists; or determining a power ratio of the maximum power to the minimum power; When the power ratio is greater than a preset ratio, it is determined that a narrowband interference signal exists.

7. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that: When the processor executes the program, the method for detecting a narrowband interference signal in a spread spectrum signal as described in any one of claims 1 to 5 above is implemented.

Images