Single Beidou receiver signal processing device resistant to multipath interference

Abstract

The present invention relates to a single Beidou receiver signal processing device that is resistant to multipath interference and is applied in the field of signal receivers. Efficient signal anti-interference processing is achieved through the collaborative work of multiple modules. The signal isolation module adopts physical isolation technology to prevent interaction between signals, effectively preventing the propagation of deceptive signals; the monitoring and maintenance module monitors changes in signal processing rules in real time, and can quickly lock and restore the damage caused by aggressive deceptive signals; the scene judgment module intelligently identifies environmental requirements and realizes on-demand utilization or suppression of multipath signals; the feature marking module combines blockchain technology to construct a dynamic blacklist sharing mechanism, and specially designs a residual information block detection mechanism, which can identify the synthetic behavior of fragmented deceptive signals. This solution significantly improves the multipath suppression capability and the deceptive signal recognition rate, while ensuring system security through one-way channel protection and rule recovery mechanisms. It is suitable for high-precision positioning needs in complex electromagnetic environments.

Description

Technical Field

[0001] The present invention relates to a single Beidou receiver signal processing device, and in particular to a single Beidou receiver signal processing device resistant to multipath interference applied in the field of signal receivers. Background Art

[0002] Multipath interference is a common phenomenon in wireless communications, radar, sonar and other fields. In essence, it is when a signal encounters reflection, refraction, scattering and other paths during propagation, resulting in the receiver receiving multiple delayed copies of the same signal. These copies are superimposed on the original signal, causing signal distortion or distortion.

[0003] The specification of Chinese invention patent CN117607916B discloses a three-dimensional adaptive anti-interference method and device, which can reduce the amplitude and phase distortion of the desired signal while reducing the computational complexity and improving the interference suppression performance.

[0004] The Chinese invention patent CN116466304A specification discloses a multipath anti-interference processing method for response signals. The stripped direct path signal has excellent correlation with the local signal and has ideal anti-multipath performance. It can be used to process target angle flicker caused by multipath effects.

[0005] Existing anti-interference signal processing operations all distinguish between direct signals and multipath signals at the receiving end. However, in fact, in some cases, multipath signals can also be received and utilized when the multipath parameters are stable and can be calibrated and compensated, or when merging multipath signals can improve the received power. In addition, some deceptive signals will also enter the receiver and interfere with the accuracy of the signal. Summary of the Invention

[0006] In view of the above-mentioned prior art, the technical problem to be solved by the present invention is to improve the receiver's recognition of deceptive signals on the basis of resisting multipath interference, thereby ensuring the stability and accuracy of the receiver's signal reception.

[0007] To solve the above problems, the present invention provides a single Beidou receiver signal processing device that is resistant to multipath interference, including a signal processing chip and an off-chip storage chip. The signal processing chip includes a signal isolation module, a channel processing module, a scene judgment module, a signal processing module, a monitoring and maintenance module, a feature marking module, and a signal receiving module.

[0008] The signal isolation module is used to isolate and shield the signal entering the receiver;

[0009] The channel processing module is used to analyze the channel parameters of the signal entering the receiver;

[0010] The scene judgment module is used to determine whether the working environment of the receiver requires the use of multipath signals;

[0011] The signal processing module is used to distinguish multipath signals, direct signals and functional deception signals;

[0012] The monitoring and maintenance module and the signal processing module transmit signals through a unidirectional channel, which is used to monitor whether the processing rules of the signal processing module have changed, and restore the rules when they have changed, and lock the offensive deception signals that induce the rule changes. In addition, a maintenance block and a repair block are arranged on the unidirectional channel to monitor whether the unidirectional channel is in normal working condition. The repair block is used to repair the unidirectional channel when it is in an abnormal working condition and restore it to normal working condition.

[0013] The feature marking module cooperates with the channel processing module to extract channel parameter features to distinguish and lock functional deception signals and offensive deception signals and form a blacklist;

[0014] The signal receiving module is used to receive the signal processed by the signal processing module.

[0015] In the above-mentioned single Beidou receiver signal processing device that is resistant to multipath interference, efficient signal anti-interference processing is achieved through the collaborative work of multiple modules, and system security is ensured through one-way channel protection and rule recovery mechanism. It is suitable for high-precision positioning needs in complex electromagnetic environments.

[0016] As a further improvement of the present application, an offensive deception signal is used to attack a signal processing module, so that the processing rules of the signal processing module are changed, making it easier for the deception signal to enter the signal receiving module. The functional deception signal is used to replace the information represented by the real signal.

[0017] As a further improvement of the present application, the off-chip storage chip includes a sharing module, a backup module and an adjustment module, wherein the sharing module uses blockchain technology to perform blacklist sharing operations with adjacent receivers, the backup module is used to back up the signal of the signal receiving module, and the adjustment module is used to adjust the channel parameters that overlap with the receiver in the functional deception signal.

[0018] As a further improvement of this application, the signal processing chip operates as follows:

[0019] S1. The signal cluster enters the signal isolation module. Each signal is covered with an isolation cover to prevent communication between signals, and is marked as an isolated signal;

[0020] S2. The isolated signal enters the channel processing module to obtain the channel parameters of each isolated signal, including delay spread, Doppler shift, amplitude attenuation, phase offset, noise power, spatial domain and polarization parameter data;

[0021] S3, perform signal processing to distinguish multipath signals, direct signals and functional deception signals;

[0022] S31. During signal processing, when the unidirectional channel is operating normally, the monitoring and maintenance module monitors whether the signal processing rules of the signal processing module have changed. If a change occurs, the transmission channel between the signal processing module and the scene determination module is frozen, and the processing object at the time of the change is locked, marked as an aggressive deceptive signal, and the signal processing rules are restored.

[0023] S32. If the unidirectional channel cannot work properly, freeze the channel between the signal processing module and the scene determination module until the unidirectional channel returns to normal working state, and then repeat S31.

[0024] S33, retrieving the channel parameters of the offensive spoofing signal and the functional spoofing signal from the channel processing module, counting them in the feature marking module, and sharing them to adjacent receivers through the sharing module;

[0025] S4. After leaving the signal processing module, remove the isolation cover;

[0026] S5. Enter the scene judgment module to determine whether the required signal requires a multipath signal. If so, the multipath signal is distorted and restored before entering the signal receiving module. Otherwise, the multipath signal is actively suppressed before entering the signal receiving module, allowing only direct signals to pass.

[0027] As a further improvement of this application, the specific steps of the signal processing module are as follows:

[0028] A1. Extract the time, frequency, spatial, and polarization features of the isolated signal, train a random forest model, and evaluate the model performance using cross-validation. The isolated signal is then fed into the trained random forest model to separate spoofing and non-spoofing signals.

[0029] A2. Distinguish multipath signals and direct signals from the isolated signals screened by A1.

[0030] As a further improvement of this application, the specific steps of S31 are as follows:

[0031] S311. If signal processing operations for multiple isolated signals are performed simultaneously, when the monitoring and maintaining module detects a change in the signal processing rule of the signal processing module at time T1, the isolated signal being processed at time T1 is preliminarily marked as a preliminary aggressive deception signal;

[0032] S312: Queue the multiple preliminary offensive deception signals in a single row and perform secondary signal processing on each signal in sequence. If no abnormality occurs in the signal processing module, proceed to S4;

[0033] S313: If the signal processing module is abnormal again, the preliminary aggressive deception signal is locked and marked as an aggressive deception signal.

[0034] As another improvement of the present application, the transmission channel of the signal processing module and the scene judgment module also includes a cleaning unit, a monitoring unit and an inspection unit. The inspection unit is used to check whether the information of the isolation signal after the isolation cover is released leaves residual information blocks when passing through the transmission channel. The cleaning unit is used to clean the residual information blocks on the transmission channel, and the monitoring unit is used to monitor the status of the isolation signal passing through the transmission channel.

[0035] As another improved supplement to the present application, the working steps of the cleaning unit and the inspection unit are as follows:

[0036] B1. After the signal passes through the transmission channel, the inspection unit inspects the transmission channel to check for residual information blocks. If so, the inspection unit cooperates with the monitoring unit on the transmission channel to check the channel parameters corresponding to the isolated signal carrying the residual information blocks, and simultaneously uses the cleaning unit to clean up the residual information blocks.

[0037] B2. Collect the cleaned residual information blocks into a separate detection unit to check whether there is any connection between the residual information blocks. If so, the signal parameters of the isolated signals corresponding to the connected residual information blocks are counted into the feature marking module and shared to the adjacent receiver through the sharing module.

[0038] In summary, efficient signal anti-interference processing is achieved through the collaborative work of multiple modules. The signal isolation module uses physical isolation technology to prevent signal interaction and effectively prevent the spread of deceptive signals. The monitoring and maintenance module monitors changes in signal processing rules in real time and can quickly lock and restore the damage caused by aggressive deceptive signals. The scene judgment module intelligently identifies environmental requirements and realizes on-demand utilization or suppression of multi-path signals. The feature marking module combines blockchain technology to build a dynamic blacklist sharing mechanism and specially designs a residual information block detection mechanism to identify the synthetic behavior of fragmented deceptive signals. This solution significantly improves the multi-path suppression capability and deceptive signal recognition rate, while ensuring system security through one-way channel protection and rule recovery mechanism, and is suitable for high-precision positioning needs in complex electromagnetic environments. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 This is the overall topological structure diagram of the first embodiment of this application;

[0040] Figure 2 This is a flowchart of the signal processing chip according to the first embodiment of the present application;

[0041] Figure 3This is a flowchart of the fraud signal detection process according to the first embodiment of the present application;

[0042] Figure 4 This is a flowchart of attack signal processing according to the first embodiment of the present application;

[0043] Figure 5 This is a flow chart of the second embodiment of the present application. DETAILED DESCRIPTION

[0044] Two implementation modes of the present application are described in detail below with reference to the accompanying drawings.

[0045] The first implementation method:

[0046] Figure 1 A single Beidou receiver signal processing device resistant to multipath interference is shown, including a signal processing chip and an off-chip storage chip. The signal processing chip includes a signal isolation module, a channel processing module, a scene judgment module, a signal processing module, a monitoring and maintenance module, a feature marking module, and a signal receiving module.

[0047] The signal isolation module is used to isolate and shield the signal entering the receiver;

[0048] The channel processing module is used to analyze the channel parameters of the signal entering the receiver;

[0049] The scene judgment module is used to determine whether the working environment of the receiver requires the use of multipath signals;

[0050] The signal processing module is used to distinguish multipath signals, direct signals and functional deception signals;

[0051] The monitoring and maintenance module and the signal processing module transmit signals through a unidirectional channel, which is used to monitor whether the processing rules of the signal processing module have changed, and restore the rules when they have changed, and lock the offensive deception signals that induce the rule changes. In addition, a maintenance block and a repair block are arranged on the unidirectional channel to monitor whether the unidirectional channel is in normal working condition. The repair block is used to repair the unidirectional channel when it is in an abnormal working condition and restore it to normal working condition.

[0052] The feature marking module cooperates with the channel processing module to extract channel parameter features to distinguish and lock functional deception signals and offensive deception signals and form a blacklist;

[0053] The signal receiving module is used to receive the signal processed by the signal processing module.

[0054] Aggressive deception signals are used to attack the signal processing module, causing the processing rules of the signal processing module to change, making it easier for the deception signals to enter the signal receiving module. Functional deception signals are used to replace the information represented by the real signal.

[0055] The off-chip storage chip includes a sharing module, a backup module and an adjustment module. The sharing module uses blockchain technology to perform blacklist sharing operations with adjacent receivers. The backup module is used to back up the signal of the signal receiving module. The adjustment module is used to adjust the channel parameters that overlap with the receiver in the functional deception signal.

[0056] Specifically, when performing signal anti-interference processing, the present application utilizes a signal isolation module to physically isolate incoming signals, thereby preventing communication between signals. This prevents spoofing signals from transferring their own spoofing blocks (which can be offensive spoofing signal blocks or functional spoofing signal blocks) to other normal signal surfaces after entering the signal processing device, thereby avoiding errors in signal recognition by the signal processing module.

[0057] The monitoring and maintenance module can monitor the normal operation of the signal processing module to prevent the attack of the signal processing module's processing rules when the offensive deception signal enters the signal processing module to facilitate the passage of subsequent deception signals, thereby ensuring the effective identification of deception signals;

[0058] The scene judgment module is used to assist in determining whether the multipath signal is available, thereby avoiding the uniform discard of the multipath signal and ensuring the comprehensiveness of the signal reception of the signal receiving device;

[0059] The feature marking module can be used to mark the channel parameters corresponding to the screened deceptive signals, providing a reference for subsequent signal blacklisting;

[0060] The one-way channel can prevent deceptive signals from contacting the monitoring and maintenance module, ensuring the singleness of the monitoring and maintenance module's monitoring of the signal processing module's processing rules. In addition, in order to prevent aggressive deceptive signals from destroying the one-way channel and causing the monitoring and maintenance module to be unable to continuously monitor the signal processing module's processing rules, the use of maintenance blocks and repair blocks can ensure the normal operation of the one-way channel.

[0061] Figure 2 As shown, the working steps of the signal processing chip are as follows:

[0062] S1. The signal cluster enters the signal isolation module. Each signal is covered with an isolation cover to prevent communication between signals, and is marked as an isolated signal;

[0063] S2. The isolated signal enters the channel processing module to obtain the channel parameters of each isolated signal, including delay spread, Doppler shift, amplitude attenuation, phase offset, noise power, spatial domain and polarization parameter data;

[0064] S3, perform signal processing to distinguish multipath signals, direct signals and functional deception signals;

[0065] S31. During signal processing, when the unidirectional channel is operating normally, the monitoring and maintenance module monitors whether the signal processing rules of the signal processing module have changed. If a change occurs, the transmission channel between the signal processing module and the scene determination module is frozen, and the processing object at the time of the change is locked, marked as an aggressive deceptive signal, and the signal processing rules are restored.

[0066] S32. If the unidirectional channel cannot work properly, freeze the channel between the signal processing module and the scene determination module until the unidirectional channel returns to normal working state, and then repeat S31.

[0067] S33, retrieving the channel parameters of the offensive spoofing signal and the functional spoofing signal from the channel processing module, counting them in the feature marking module, and sharing them to adjacent receivers through the sharing module;

[0068] S4. After leaving the signal processing module, remove the isolation cover;

[0069] S5. Enter the scene judgment module to determine whether the required signal requires a multipath signal. If so, the multipath signal is distorted and restored before entering the signal receiving module. Otherwise, the multipath signal is actively suppressed before entering the signal receiving module, allowing only direct signals to pass.

[0070] Specifically, after the signal is isolated and processed, the channel parameters of the signal are obtained, and then signal processing is performed to screen out multipath signals, direct signals and deceptive signals. After the signal processing is completed, the isolation cover is removed, and after entering the scene judgment module, the multipath signal is processed in a targeted manner and then enters the signal receiving module.

[0071] Figure 3 As shown, the specific steps of the signal processing module are as follows:

[0072] A1. Extract the time, frequency, spatial, and polarization features of the isolated signal, train a random forest model, and evaluate the model performance using cross-validation. The isolated signal is then fed into the trained random forest model to separate spoofing and non-spoofing signals.

[0073] A2. Distinguish multipath signals and direct signals from the isolated signals screened by A1.

[0074] Specifically, the distinction between multipath signals and direct signals is an existing technology and can be performed through time domain, spatial domain or frequency domain analysis. Since it is an existing technology, no further details will be given. In addition, random forest models and cross-validation are also existing technologies and no further details will be given here.

[0075] Figure 4 As shown, the specific steps of S31 are as follows:

[0076] S311. If signal processing operations for multiple isolated signals are performed simultaneously, when the monitoring and maintaining module detects a change in the signal processing rule of the signal processing module at time T1, the isolated signal being processed at time T1 is preliminarily marked as a preliminary aggressive deception signal;

[0077] S312: Queue the multiple preliminary offensive deception signals in a single row and perform secondary signal processing on each signal in sequence. If no abnormality occurs in the signal processing module, proceed to S4;

[0078] S313: If the signal processing module is abnormal again, the preliminary aggressive deception signal is locked and marked as an aggressive deception signal.

[0079] Specifically, if the aggressiveness of the aggressive deceptive signal surface is a one-time attack behavior, it will not be able to continue to attack the signal processing module after the single attack is over, and if the aggressive deceptive signal surface does not carry other functional deceptive signal blocks, it will leave the signal processing module together with other signals after the attack is over.

[0080] Second implementation method:

[0081] Figure 5 It is shown that the transmission channel of the signal processing module and the scene judgment module also includes a cleaning unit, a monitoring unit and an inspection unit. The inspection unit is used to check whether the information of the isolation signal after the isolation cover is released leaves residual information blocks when passing through the transmission channel. The cleaning unit is used to clean the residual information blocks on the transmission channel. The monitoring unit is used to monitor the status of the isolation signal passing through the transmission channel.

[0082] The working steps of the cleaning unit and the inspection unit are as follows:

[0083] B1. After the signal passes through the transmission channel, the inspection unit inspects the transmission channel to check for residual information blocks. If so, the inspection unit cooperates with the monitoring unit on the transmission channel to check the channel parameters corresponding to the isolated signal carrying the residual information blocks, and simultaneously uses the cleaning unit to clean up the residual information blocks.

[0084] B2. Collect the cleaned residual information blocks into a separate detection unit to check whether there is any connection between the residual information blocks. If so, the signal parameters of the isolated signals corresponding to the connected residual information blocks are counted into the feature marking module and shared to the adjacent receiver through the sharing module.

[0085] Different from the first embodiment, this embodiment mainly targets the first embodiment, in which the functional or offensive deception signal is divided into multiple small blocks, each small block is carried on a different batch of signals, and each small block will be masked so as to pass the functional deception detection in the first embodiment. After leaving the signal processing module, each small block will be left on the transmission channel, and subsequent signals will also leave small blocks when passing through. The superposition of multiple small blocks can synthesize and form a complete functional deception signal or offensive deception signal. This phenomenon is improved.

[0086] Specifically, when the signal leaves the signal processing module and passes through the transmission channel, if residual information blocks are left, they can be cleaned up to avoid the synthesis of small blocks. At the same time, the cleaned small blocks can be placed in an independent detection unit to check whether there is any connection or synthesis phenomenon. If so, it indicates that there is a deceptive signal, and the channel parameters corresponding to the small blocks need to be called out for feature marking.

[0087] In summary, efficient signal anti-interference processing is achieved through the collaborative work of multiple modules. The signal isolation module uses physical isolation technology to prevent interaction between signals, effectively preventing the spread of deceptive signals; the monitoring and maintenance module monitors changes in signal processing rules in real time, and can quickly lock and restore the damage caused by aggressive deceptive signals; the scene judgment module intelligently identifies environmental requirements and realizes on-demand utilization or suppression of multi-path signals; the feature marking module combines blockchain technology to build a dynamic blacklist sharing mechanism, and specially designs a residual information block detection mechanism to identify the synthetic behavior of fragmented deceptive signals. This solution significantly improves the multi-path suppression capability and deceptive signal recognition rate, while ensuring system security through one-way channel protection and rule recovery mechanism, and is suitable for high-precision positioning needs in complex electromagnetic environments.

[0088] In view of current actual needs, the protection scope of the above-mentioned implementation mode adopted in this application is not limited to this. Various changes made within the knowledge scope of technical personnel in this field without departing from the concept of this application still fall within the protection scope of the present invention.

Claims

1. A single Beidou receiver signal processing device resistant to multipath interference, comprising a signal processing chip and an off-chip storage chip, characterized in that: The signal processing chip includes a signal isolation module, a channel processing module, a scene judgment module, a signal processing module, a monitoring and maintenance module, a feature marking module and a signal receiving module; The signal isolation module is used to isolate and shield the signal entering the receiver; The channel processing module is used to analyze channel parameters of the signal entering the receiver; The scene determination module is used to determine whether the working environment of the receiver requires the use of multipath signals; The signal processing module is used to distinguish multipath signals, direct signals and functional deception signals; The monitoring and maintenance module and the signal processing module transmit signals through a unidirectional channel, and are used to monitor whether the processing rules of the signal processing module have changed. When the rules have changed, the rules are restored and the offensive deception signals that induce the rule changes are locked. A maintenance block and a repair block are arranged on the unidirectional channel to monitor whether the unidirectional channel is in normal working condition. The repair block is used to repair the unidirectional channel when it is in an abnormal working condition and restore it to normal working condition. The feature marking module cooperates with the channel processing module to retrieve channel parameter features to distinguish and lock functional deception signals and offensive deception signals and form a blacklist; The signal receiving module is used to receive the signal processed by the signal processing module.

2. The multipath interference resistant single Beidou receiver signal processing device according to claim 1, characterized in that: The offensive deception signal is used to attack the signal processing module, so that the processing rules of the signal processing module are changed, making it easier for the deception signal to enter the signal receiving module. The functional deception signal is used to replace the information represented by the real signal.

3. The multipath interference resistant single Beidou receiver signal processing device according to claim 2, characterized in that: The off-chip storage chip includes a sharing module, a backup module and an adjustment module, wherein the sharing module uses blockchain technology to perform blacklist sharing operations with adjacent receivers, the backup module is used to back up the signal of the signal receiving module, and the adjustment module is used to adjust the channel parameters that overlap with the receiver in the functional deception signal.

4. The multipath interference resistant single Beidou receiver signal processing device according to claim 3, characterized in that: The working steps of the signal processing chip are as follows: S1. The signal cluster enters the signal isolation module. Each signal is covered with an isolation cover to prevent communication between signals, and is marked as an isolated signal; S2. The isolated signal enters the channel processing module to obtain the channel parameters of each isolated signal, including delay spread, Doppler shift, amplitude attenuation, phase offset, noise power, spatial domain and polarization parameter data; S3, perform signal processing to distinguish multipath signals, direct signals and functional deception signals; S31. During signal processing, when the unidirectional channel is operating normally, the monitoring and maintenance module monitors whether the signal processing rules of the signal processing module have changed. If a change occurs, the transmission channel between the signal processing module and the scene determination module is frozen, and the processing object at the time of the change is locked, marked as an aggressive deceptive signal, and the signal processing rules are restored. S32. If the unidirectional channel cannot work properly, freeze the channel between the signal processing module and the scene determination module until the unidirectional channel returns to normal working state, and then repeat S31. S33, retrieving the channel parameters of the offensive spoofing signal and the functional spoofing signal from the channel processing module, counting them in the feature marking module, and sharing them to adjacent receivers through the sharing module; S4. After leaving the signal processing module, remove the isolation cover; S5. Enter the scene judgment module to determine whether the required signal requires a multipath signal. If so, the multipath signal is distorted and restored before entering the signal receiving module. Otherwise, the multipath signal is actively suppressed before entering the signal receiving module, allowing only direct signals to pass.

5. The multipath interference resistant single Beidou receiver signal processing device according to claim 4, characterized in that: The specific steps of the signal processing module are as follows: A1. Extract the time, frequency, spatial, and polarization features of the isolated signal, train a random forest model, and evaluate the model performance using cross-validation. The isolated signal is then fed into the trained random forest model to separate spoofing and non-spoofing signals. A2. Distinguish multipath signals and direct signals from the isolated signals screened by A1.

6. The multipath interference resistant single Beidou receiver signal processing device according to claim 5, characterized in that: The specific steps of S31 are as follows: S311. If signal processing operations for multiple isolated signals are performed simultaneously, when the monitoring and maintaining module detects a change in the signal processing rule of the signal processing module at time T1, the isolated signal being processed at time T1 is preliminarily marked as a preliminary aggressive deception signal; S312: Queue the multiple preliminary offensive deception signals in a single row and perform secondary signal processing on each signal in sequence. If no abnormality occurs in the signal processing module, proceed to S4; S313: If the signal processing module is abnormal again, the preliminary aggressive deception signal is locked and marked as an aggressive deception signal.

7. The multipath interference resistant single Beidou receiver signal processing device according to claim 1, characterized in that: The transmission channel of the signal processing module and the scene judgment module also includes a cleaning unit, a monitoring unit and an inspection unit. The inspection unit is used to check whether the information of the isolation signal after the isolation cover is released leaves residual information blocks when passing through the transmission channel. The cleaning unit is used to clean the residual information blocks on the transmission channel. The monitoring unit is used to monitor the status of the isolation signal passing through the transmission channel.

8. The multipath interference resistant single Beidou receiver signal processing device according to claim 7, characterized in that: The working steps of the cleaning unit and the inspection unit are as follows: B1. After the signal passes through the transmission channel, the inspection unit inspects the transmission channel to check for residual information blocks. If so, the inspection unit cooperates with the monitoring unit on the transmission channel to check the channel parameters corresponding to the isolated signal carrying the residual information blocks, and simultaneously uses the cleaning unit to clean up the residual information blocks. B2. Collect the cleaned residual information blocks into a separate detection unit to check whether there is any connection between the residual information blocks. If so, the signal parameters of the isolated signals corresponding to the connected residual information blocks are counted into the feature marking module and shared to the adjacent receiver through the sharing module.

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