Time slot compliance test method and system for analyzing TDMA signal based on sequence space neighborhood

Abstract

The invention relates to a time slot compliance test method and system for analyzing a TDMA signal based on a sequence space neighborhood. The method comprises the following steps: acquiring a TDMA signal received by a satellite communication system; preprocessing the obtained TDMA signal to obtain TDMA signal data with time slot information; constructing a sequence space array according to a TDMA signal communication structure; extracting a time slot feature vector by applying a neighborhood analysis algorithm; constructing a standard sequence space array for the original TDMA signal data according to a user time slot, comparing an extracted time slot feature vector with a preset time slot compliance standard, judging whether the time slot of the TDMA signal is compliant or not, and if the time slot feature vector meets the preset time slot compliance standard, considering that the time slot of the TDMA signal is compliant; otherwise, considering that the time slot is not compliant; and if the time slot of the TDMA signal is not compliant, an alarm mechanism is triggered, and a system administrator is notified to carry out corresponding processing. According to the method, the time slot compliance of the TDMA signal can be accurately detected, and the detection precision is improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of satellite communications, and in particular relates to a time slot compliance checking method and system for TDMA signals based on sequence space neighborhood analysis. Background Art

[0002] With the continuous development of satellite communication technology, TDMA, as an efficient multiple access method, has been widely used in satellite communication systems. However, due to the openness and susceptibility of satellite communication channels to interference, TDMA signals may face threats such as electromagnetic interference, signal interception, and intrusion during transmission. This can lead to time slot compliance issues, thus affecting the normal operation of the system and communication quality.

[0003] TDMA satellite communication signals follow specific rules, transmitting their modulated signals in bursts within pre-set time slots. These TDMA satellite communication signals are strictly time-sequential and non-overlapping during forwarding, and each earth station is required to use the same carrier to transmit signals to the satellite. If a TDMA signal is interfered with, effective monitoring, based on factors such as the burst structure of the time slot and the time slot allocation of networked users, is directly related to the system's ability to accurately classify and judge attack behaviors, as well as to generate early warnings and reports. Therefore, accurately detecting the compliance of TDMA signal time slots has become a key technology in TDMA satellite communication signal processing.

[0004] Existing methods for detecting TDMA signal time slot compliance are mostly based on traditional signal processing algorithms, such as spectrum analysis and time domain analysis. However, these methods may suffer from insufficient detection accuracy and poor robustness in complex electromagnetic environments, making them difficult to meet the requirements of modern satellite communication systems. Summary of the Invention

[0005] The purpose of the present invention is to provide a time slot compliance verification method and system for TDMA signals based on sequence space neighborhood analysis, aiming to improve the security threat monitoring capability of TDMA signals in complex electromagnetic environments.

[0006] The present invention provides a time slot compliance verification method for TDMA signals based on sequence space neighborhood analysis, comprising the following steps:

[0007] Step 1, obtaining a TDMA signal received by a satellite communication system;

[0008] Step 2: pre-process the acquired TDMA signal to obtain TDMA signal data with time slot information;

[0009] Step 3: construct a sequence space array according to the TDMA signal communication structure;

[0010] Step 4: Apply neighborhood analysis algorithm to extract time slot feature vectors;

[0011] Step 5: construct a standard sequence space array based on the original TDMA signal data according to the user time slot, compare the extracted time slot feature vector with the preset time slot compliance standard, and determine whether the time slot of the TDMA signal is compliant. If the time slot feature vector meets the preset time slot compliance standard, the time slot of the TDMA signal is considered compliant; otherwise, the time slot is considered non-compliant.

[0012] Step 6: Execute corresponding actions according to the time slot compliance judgment result. If the time slot of the TDMA signal is not compliant, trigger the alarm mechanism and notify the system administrator to take corresponding measures.

[0013] Furthermore, the step 2 includes:

[0014] Perform parameter estimation on TDMA signals to estimate the modulation rate, center frequency of the signal, and signal-to-noise ratio parameters;

[0015] Performing modulation identification on the TDMA signal to identify the modulation mode of the TDMA signal;

[0016] Corresponding demodulation is performed according to the modulation mode of the TDMA signal to demodulate TDMA signal data with time slot information.

[0017] Furthermore, the step 3 includes:

[0018] The pre-processed TDMA signal data is mapped to the sequence space, and the number of time slots is set as the horizontal axis coordinate and the number of superframe time slots is set as the vertical axis coordinate to establish a coordinate system to obtain the sequence space array of the TDMA signal.

[0019] Furthermore, the step 4 includes:

[0020] Perform unique code search on the demodulated TDMA signal data;

[0021] Arrange the calculated unique codes according to the time slot superframe;

[0022] The location of the unique code is calculated by the neighborhood analysis algorithm, and the time slots are rearranged;

[0023] Place the results of the neighborhood analysis algorithm into a sequence space array.

[0024] Furthermore, the step 6 further includes:

[0025] If the time slot of the TDMA signal complies with the regulations, the compliance result is output.

[0026] The present invention also provides a time slot compliance verification system for TDMA signals based on sequence space neighborhood analysis, characterized in that it includes a verification module, which executes the time slot compliance verification method for TDMA signals based on sequence space neighborhood analysis.

[0027] The present invention also provides a non-transitory computer-readable storage medium, which stores computer instructions. When the computer instructions are executed by a processor, the method for checking time slot compliance of a TDMA signal based on sequence space neighborhood analysis is implemented.

[0028] The present invention also provides an electronic device, comprising:

[0029] A memory and a processor, wherein the memory and the processor are communicatively connected to each other, the memory stores computer instructions, and the processor executes the time slot compliance checking method of TDMA signal based on sequence space neighborhood analysis by executing the computer instructions.

[0030] The above solution provides a method and system for checking the time slot compliance of TDMA signals based on sequence space neighborhood analysis, which has the following technical effects:

[0031] 1) The present invention constructs a sequence space model and uses a neighborhood analysis algorithm to extract and analyze the time slot characteristics of the TDMA signal, thereby accurately detecting the time slot compliance of the TDMA signal and improving the detection accuracy.

[0032] 2) The present invention has strong robustness against interference and noise in complex electromagnetic environments, and can overcome the limitations of traditional detection methods in complex environments to a certain extent.

[0033] 3) By accurately detecting the time slot compliance of the TDMA signal, the present invention can timely discover and handle potential communication failures, thereby improving the overall performance and stability of the satellite communication system.

[0034] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention and implement it according to the contents of the specification, the following is a detailed description of the preferred embodiments of the present invention with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 Flowchart of the time slot compliance checking method of TDMA signal based on sequence space neighborhood analysis according to the present invention;

[0036] Figure 2 A sequence space array diagram in one embodiment of the present invention;

[0037] Figure 3A schematic diagram of a TDMA signal frame structure in one embodiment of the present invention;

[0038] Figure 4 The figure is a schematic diagram of an electronic device according to the present invention. DETAILED DESCRIPTION

[0039] The following embodiments of the present invention are described in further detail with reference to the accompanying drawings and examples. The following examples are used to illustrate the present invention but are not intended to limit the scope of the present invention.

[0040] Ginseng Figure 1 As shown, this embodiment provides a TDMA signal time slot compliance detection method based on sequence space neighborhood analysis. This method constructs a sequence space array of the TDMA signal and uses a neighborhood analysis algorithm to extract and analyze the signal's time slot characteristics, thereby accurately detecting the TDMA signal time slot compliance. Specifically, the method includes the following steps:

[0041] 1. Signal acquisition

[0042] First, the TDMA signal is received through the satellite communication system, and then the received analog signal is converted into a digital signal, and the TDMA signal is collected through the acquisition card.

[0043] 2. Preprocessing

[0044] By performing parameter estimation on the acquired TDMA signal, parameters such as the modulation rate, center frequency, and signal-to-noise ratio are estimated. Modulation recognition is then performed on the TDMA signal to identify its modulation scheme. Finally, demodulation is performed based on the modulation scheme to extract the TDMA signal data with time slot information.

[0045] 3. Sequence space array construction

[0046] The construction of the sequence space array is based on the TDMA signal communication structure. TDMA signal communication is the signal received from different earth stations in time sequence. The arrangement must be compact and non-overlapping. This ensures that there is only one TDMA carrier in the satellite transponder at a certain time, and there will be no intermodulation or large carrier suppressing small carrier. This allows the satellite's power amplifier to operate in the saturation area and obtain the maximum satellite output power.

[0047] In a TDMA frame, the time slot occupied by each earth station is called a frame. The time slot occupied by the reference earth station is called the synchronization frame (or reference frame) RB, and the time slot occupied by other earth stations is called the data frame (or service frame) DB.

[0048] In a TDMA frame, the time slot occupied by each earth station is called a frame, which is divided into a synchronization frame and a data frame. The synchronization frame includes a carrier, bit timing recovery, a unique code and a station address identification code. A data frame contains several service frames, and each service frame is composed of a frame header and multiple PCM data channels. The number of service frames included is related to the number of stations or addresses accommodated in the system. In order to avoid this phenomenon, a certain amount of protection time is left between each service frame. The TDMA signal frame structure is as follows: Figure 2 shown.

[0049] The construction of the sequence space array maps the pre-processed TDMA signal data to the sequence space, where the number of time slots is set as the horizontal axis coordinate and the number of superframe time slots is set as the vertical axis coordinate. By establishing this coordinate system, the sequence space array of the TDMA signal can be successfully constructed. The sequence space array has an important function, which is to clearly show the time slot compliance of the TDMA signal. The sequence space array is as follows: Figure 3 shown. Figure 3 The same data in the represents the number of time slots used by the user. If the number of time slots is the same as the preset time slot standard, it is considered that the TDMA signal time slot is compliant, and the TDMA signal is considered not to be an external TDMA signal.

[0050] 4. Neighborhood Analysis Algorithm

[0051] The main steps of the neighborhood analysis algorithm are as follows:

[0052] (1) Since each user uses a different unique code, the demodulated TDMA signal data can be used to search for the unique code;

[0053] (2) Arrange the calculated unique codes according to the time slot superframe;

[0054] (3) The location of the unique code is calculated by the neighborhood analysis algorithm to rearrange the time slots. The basic idea of the neighborhood analysis algorithm is to compare the known data in the vertical and horizontal directions according to the space, and the time slots that are close to the known data are considered to be the same user.

[0055] (4) The results calculated by the neighborhood analysis algorithm are placed in the sequence space array.

[0056] 5. Time slot compliance judgment

[0057] The original TDMA signal data is used to construct a standard sequence space array based on user time slots. The extracted time slot feature vector is compared with the preset time slot compliance standard to determine whether the TDMA signal time slot is compliant. If the time slot feature vector meets the preset standard, the TDMA signal time slot is considered compliant; otherwise, the time slot is considered non-compliant.

[0058] 6. Result output warning

[0059] Result output warning: Based on the time slot compliance judgment results, the corresponding detection results are output. If the time slot of the TDMA signal is detected to be non-compliant, the alarm mechanism is triggered to notify the system administrator to take appropriate measures.

[0060] The present invention has the following technical effects:

[0061] 1) The present invention constructs a sequence space model and uses a neighborhood analysis algorithm to extract and analyze the time slot characteristics of the TDMA signal, thereby accurately detecting the time slot compliance of the TDMA signal and improving the detection accuracy.

[0062] 2) The present invention has strong robustness against interference and noise in complex electromagnetic environments, and can overcome the limitations of traditional detection methods in complex environments to a certain extent.

[0063] 3) By accurately detecting the time slot compliance of the TDMA signal, the present invention can timely discover and handle potential communication failures, thereby improving the overall performance and stability of the satellite communication system.

[0064] This embodiment further provides a time slot compliance checking system for TDMA signals based on sequence space neighborhood analysis, including a checking module. The checking module executes the time slot compliance checking method for TDMA signals based on sequence space neighborhood analysis.

[0065] This embodiment also provides a non-transitory computer-readable storage medium, which stores computer instructions. When the computer instructions are executed by a processor, they implement the time slot compliance verification method of TDMA signals based on sequence space neighborhood analysis.

[0066] Ginseng Figure 4 As shown, this embodiment further provides an electronic device, including:

[0067] A memory 201 and a processor 202, wherein the memory 201 and the processor 202 are communicatively connected to each other, the memory 201 stores computer instructions, and the processor 202 executes the time slot compliance verification method of the TDMA signal based on sequence space neighborhood analysis by executing the computer instructions.

[0068] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A time slot compliance verification method for TDMA signals based on sequence space neighborhood analysis, characterized in that: The steps include: Step 1, obtaining a TDMA signal received by a satellite communication system; Step 2: pre-process the acquired TDMA signal to obtain TDMA signal data with time slot information; Step 3: construct a sequence space array according to the TDMA signal communication structure; Step 4: Apply neighborhood analysis algorithm to extract time slot feature vectors; Step 5: construct a standard sequence space array based on the original TDMA signal data according to the user time slot, compare the extracted time slot feature vector with the preset time slot compliance standard, and determine whether the time slot of the TDMA signal is compliant. If the time slot feature vector meets the preset time slot compliance standard, the time slot of the TDMA signal is considered compliant; otherwise, the time slot is considered non-compliant. Step 6: Execute corresponding actions according to the time slot compliance judgment result. If the time slot of the TDMA signal is not compliant, trigger the alarm mechanism and notify the system administrator to take corresponding measures.

2. The time slot compliance checking method for TDMA signals based on sequence space neighborhood analysis according to claim 1, characterized in that: The step 2 includes: Perform parameter estimation on TDMA signals to estimate the modulation rate, center frequency of the signal, and signal-to-noise ratio parameters; Performing modulation identification on the TDMA signal to identify the modulation mode of the TDMA signal; Corresponding demodulation is performed according to the modulation mode of the TDMA signal to demodulate TDMA signal data with time slot information.

3. The time slot compliance checking method for TDMA signals based on sequence space neighborhood analysis according to claim 2, characterized in that: The step 3 includes: The pre-processed TDMA signal data is mapped to the sequence space, and the number of time slots is set as the horizontal axis coordinate and the number of superframe time slots is set as the vertical axis coordinate to establish a coordinate system to obtain the sequence space array of the TDMA signal.

4. The time slot compliance checking method for TDMA signals based on sequence space neighborhood analysis according to claim 3, characterized in that: The step 4 comprises: Perform unique code search on the demodulated TDMA signal data; Arrange the calculated unique codes according to the time slot superframe; The location of the unique code is calculated by the neighborhood analysis algorithm, and the time slots are rearranged; Place the results of the neighborhood analysis algorithm into a sequence space array.

5. The time slot compliance checking method for TDMA signals based on sequence space neighborhood analysis according to claim 4, characterized in that: The step 6 further comprises: If the time slot of the TDMA signal complies with the regulations, the compliance result is output.

6. A time slot compliance verification system for TDMA signals based on sequence space neighborhood analysis, characterized in that: The system comprises a testing module, which executes the time slot compliance testing method of TDMA signal based on sequence space neighborhood analysis according to any one of claims 1 to 5.

7. A non-transitory computer-readable storage medium, characterized in that The non-transitory computer-readable storage medium stores computer instructions, which, when executed by a processor, implement a time slot compliance checking method for TDMA signals based on sequence space neighborhood analysis as described in any one of claims 1 to 5.

8. An electronic device, characterized in that: include: A memory and a processor, wherein the memory and the processor are communicatively connected to each other, the memory stores computer instructions, and the processor executes the time slot compliance verification method for TDMA signals based on sequence space neighborhood analysis as described in any one of claims 1 to 5 by executing the computer instructions.

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