KR20200141791A - Signal processing apparatus and signal processing method - Google Patents

Abstract

A signal processing apparatus is disclosed. According to the present invention, the signal processing apparatus comprises: a receiving unit which receives a plurality of telemetry signals made of a frame structure; and a processor for detecting an event frame in which a random event has occurred from the plurality of received telemetry signals, calculating a time difference between the reception time of the event frame detected from the remaining telemetry signals based on the reception time of the event frame detected from any one telemetry signal, compensating the calculated time difference and synchronizing the plurality of telemetry signals based on the event frame, and finding a path by fusing the plurality of synchronized telemetry signals. According to various embodiments of the present invention, it is possible to process a plurality of telemetry signals as optimal single telemetry data. Therefore, the overall telemetry data processing time can be drastically reduced.

Description

Signal processing device and its signal processing method {SIGNAL PROCESSING APPARATUS AND SIGNAL PROCESSING METHOD}

The present invention relates to a signal processing apparatus and a signal processing method thereof, and more particularly, to a signal processing apparatus for processing a telemetry signal and a signal processing method thereof.

Telemetry ground systems are operated on the ground in order to acquire radio frequency signals transmitted from targets moving at a long distance, such as aircraft, satellites, and missiles. In general, the object to be measured moves quickly, and the transmitted antenna pattern is not uniform depending on the attitude of the object to be measured and the relative orientation of the telemetry ground system. In addition, multi-path fading occurs due to various causes, such as atmospheric humidity, ground flatness, and sea reflection waves constituting the wireless transmission section, resulting in signal degradation.

Various signal processing techniques are used on the ground to restore a distorted signal to a normal signal, one of which is spatial diversity. In the field of telemetry, spatial diversity is the operation of deploying and operating multiple telemetry ground systems at different locations. Through this, there is no correlation in the wireless transmission section between each ground system and the target to be measured. The measurement signal is acquired.

Here, since the telemetry signals acquired from each telemetry ground system are received from one transmission signal source, they should be identical to each other from a data point of view. However, different radio transmission sections are passed, the telemetry terrestrial systems receiving are different, and inevitably different signal paths are passed depending on the communication environment or whether the received signal is retransmitted. In addition, since the clock information of the local time generation device used in the process of transmitting or receiving a signal is not always uniform, even when a single signal is viewed, it appears as a periodic characteristic. This phenomenon also occurs when a communication environment, a communication error state, or a signal path changes over time.

From the point of view of collecting and post-processing signals acquired from all telemetry ground systems, even if an error is included at a specific point in a signal acquired from one ground system, there may be an error at the same point in the signal acquired from another ground system. May or may not be. Accordingly, in order to obtain one complete telemetry signal through a post-processing process, a processing procedure of fusing several telemetry signals acquired from a plurality of telemetry ground systems into one is required.

In order to fuse a plurality of telemetry signals into one, a method of acquiring synchronization between received signals is needed above all else, and a synchronization state must be continuously maintained even in the process of processing signals. In addition, there is a need for a method for determining whether an error has occurred and a method for removing the error in processing a plurality of signals.

The present invention is to solve the above-described problem, and an object of the present invention is to obtain and maintain synchronization between a plurality of telemetry signals, determine a signal error state, derive an optimal signal processing path, and perform post-processing. It is to present a method of obtaining good telemetry data.

In order to achieve the above object, a signal processing apparatus according to an embodiment of the present invention includes a receiver configured to receive a plurality of telemetry signals having a frame structure, and a random event is generated from the received plurality of telemetry signals. Detect the event frame, calculate the time difference of the reception time of the event frame detected from the remaining telemetry signals based on the reception time of the event frame detected from any one telemetry signal, and calculate each of the calculated time differences And a processor for correcting and synchronizing the plurality of telemetry signals based on the event frame and searching for an optimum path for fusing the synchronized plurality of telemetry signals.

In this case, when it is determined that any one of the event frames included in the plurality of telemetry signals has an error, the processor receives the event frame in which the error exists based on a counter included in a frame in which no error exists. Time can be estimated.

In addition, the processor calculates a weight sum based on at least one of a frame boundary pattern, continuity of auxiliary information included in each frame, and error detection code information, and the plurality of telemetry signals based on the calculated weight sum. It is possible to determine whether each included frame has an error.

In addition, the processor calculates an error state score of each frame based on the calculated sum of weights, and based on the calculated error state score, the processor selects one of the frames included in the plurality of synchronized telemetry signals. An optimal path for fusing the synchronized plurality of telemetry signals may be searched by selecting and fusing them.

In addition, the processor calculates each expected section including the frame time to be corrected in the second synchronization period, based on the time difference corrected in the first synchronization period and the frame time of the telemetry signal currently being searched, and selects another telemetry Synchronization may be determined by detecting whether the corrected frame time of the signal is included in the calculated expected interval and the counter values coincide.

On the other hand, the signal processing method according to an embodiment of the present invention includes the steps of receiving a plurality of telemetry signals having a frame structure, detecting an event frame in which a random event occurs from the plurality of received telemetry signals, Calculating a parallax of the reception time of the event frame detected from the remaining telemetry signals based on the reception time of the event frame detected from any one of the plurality of telemetry signals, each of the calculated And synchronizing the plurality of telemetry signals on the basis of the event frame by correcting the parallax of, and searching for a path for fusion of the synchronized plurality of telemetry signals.

In this case, in the calculating, when it is determined that any one of the event frames included in the plurality of telemetry signals has an error, the event frame in which the error exists based on a counter included in a frame in which no error exists. The reception time of can be estimated.

In addition, the calculating may include calculating a weight sum based on at least one of a frame boundary pattern, continuity of auxiliary information included in each frame, and error detection code information, and the plurality of telemetry based on the calculated weight sum. It is possible to determine whether each frame included in the signal has an error.

In addition, in the step of searching, an error state score of each frame is calculated based on the calculated weight sum, and based on the calculated error state score, one of the frames included in the plurality of synchronized telemetry signals By selecting and fusing frames, a path for fusing the synchronized plurality of telemetry signals may be searched.

In addition, in the step of searching, based on the time difference corrected in the first synchronization period and the frame time of the telemetry signal currently being searched, each expected section including the frame time to be corrected in the second synchronization period is calculated, and the selected other Synchronization may be determined by detecting whether the corrected frame time of the telemetry signal is included in the calculated expected interval and the counter value coincides.

According to various embodiments of the present invention as described above, it is possible to process a plurality of telemetry signals as optimal single telemetry data. Therefore, the overall telemetry data processing time can be drastically reduced.

In addition, errors in the fusion-processed telemetry data are greatly reduced, so that data transmitted from the target to be measured can be accurately analyzed.

1 is a block diagram schematically showing the configuration of a signal processing apparatus according to an embodiment of the present invention;
2 is a view for explaining each frame of a plurality of telemetry signals according to an embodiment of the present invention;
3 is a view for explaining a method of calculating a correction time of each frame of a telemetry signal based on an event frame according to an embodiment of the present invention;
4 is a diagram for explaining a problem when an error occurs in an event frame according to an embodiment of the present invention;
5 is a diagram for explaining a method of calculating a correction time of an event frame in which an error has occurred, according to an embodiment of the present invention;
6 is a flowchart illustrating a method of calculating an error score for a frame included in a telemetry signal according to an embodiment of the present invention;
7A and 7B are flowcharts illustrating a method of searching for an optimal signal processing path while maintaining synchronization of a plurality of telemetry signals according to an embodiment of the present invention;
8 is a flowchart for briefly explaining a signal processing method according to an embodiment of the present invention.

First, general terms used in the specification and claims are selected in consideration of functions in various embodiments of the present invention. However, these terms may vary according to the intention of a technician in the field, legal or technical interpretation, and the emergence of new technologies. In addition, some terms may be terms arbitrarily selected by the applicant. These terms may be interpreted as the meanings defined in the present specification, and if there is no specific term definition, they may be interpreted based on the general contents of the present specification and common technical knowledge in the art.

In addition, the same reference numbers or numerals in each drawing attached to the present specification indicate parts or components that perform substantially the same function. For convenience of description and understanding, different embodiments will be described using the same reference numbers or symbols. That is, even if all the components having the same reference numerals are shown in a plurality of drawings, the plurality of drawings do not mean one embodiment.

In addition, in the specification and claims, terms including ordinal numbers such as'first' and'second' may be used to distinguish between components. These ordinal numbers are used to distinguish the same or similar constituent elements from each other, and the meaning of the term should not be limitedly interpreted due to the use of such ordinal numbers. For example, components combined with these ordinal numbers should not be interpreted as limiting the order of use or arrangement by the number. If necessary, each of the ordinal numbers may be used interchangeably.

In the present specification, expressions in the singular include plural expressions unless the context clearly indicates otherwise. In the present application, terms such as'comprise' or'comprise' are intended to designate the existence of features, numbers, steps, actions, components, parts, or a combination thereof described in the specification, but one or more other It is to be understood that it does not preclude the presence or addition of features, numbers, steps, actions, components, parts, or combinations thereof.

In addition, in an embodiment of the present invention, when a part is connected to another part, this includes not only a direct connection but also an indirect connection through another medium. In addition, the meaning that a certain part includes a certain component means that other components may be further included rather than excluding other components unless specifically stated to the contrary.

Hereinafter, the present invention will be described in more detail with reference to the accompanying drawings.

1 is a block diagram schematically showing the configuration of a signal processing apparatus according to an embodiment of the present invention.

The signal processing apparatus 100 of the present invention includes a receiving unit 110 and a processor 120.

The receiver 110 is a component that receives a signal measured remotely through a wireless communication method. The reception unit 110 transmits the received telemetry signal to the processor 120.

The processor 120 may utilize independent reference time information included in each telemetry signal and auxiliary information such as a simple counter in order to obtain and maintain visual synchronization at the frame level between the plurality of received telemetry signals. have.

In the first synchronization step, the processor 120 detects the occurrence of each random event in different telemetry signals, and compares the reception time of the frame determined to have occurred and the counter value of the frame. You can calculate the parallax between the telemetry signals.

The processor 120 may obtain synchronization between the telemetry signals based on the time when the event occurs by referring to the calculated parallax information.

The processor 120 uses a weighting technique to determine whether an error occurs for each frame in the process of processing each telemetry signal. In this case, whether a frame boundary pattern periodically inserted into a frame has an error, whether auxiliary information included in each frame is continuity, and error detection code information may be used to distinguish the frame boundary.

The processor 120 calculates a weight sum based on each of the above-described pieces of information, and determines whether or not each frame has an error based on the calculated weight sum. In the process of individually processing each telemetry signal, the synchronized parallax information based on the event occurrence time calculated in the first synchronization step is referenced, and reference time information for each frame, first corrected time information, simple counter value, frame error Information, etc. will be collected.

When the individual processing of each telemetry signal is finished, the process proceeds to the fusion signal processing step. Here, secondary synchronization is acquired and maintained based on the information collected in the individual processing of the signal. In addition, a good signal processing path is searched among several signals based on the error score of each frame.

The processor 120 estimates a roughly expected synchronization period (frame unit) using the parallax calculated in the first synchronization step, and then performs detailed synchronization using a simple counter value. When synchronization is achieved, the parallax information of the two signals can be updated by calculating the reference time difference between the two signals.

In the process of searching for an optimal signal path, the second synchronization is repeatedly performed periodically to obtain and maintain synchronization between different signals.

When searching for an optimal signal path, the processor 120 determines that the signal is good by referring to the frame error information. If it is determined that an error has occurred in the signal, the remaining spare signals and 2 The primary synchronization procedure is performed.

After synchronization is achieved, the processor 120 continues to search for an optimal signal path by selecting the best signal based on the frame error score among the synchronized signals. The processor 120 repeatedly performs this process until all the signals acquired from each receiving system are searched, thereby finding an optimal signal path in which all the telemetry signals are fused.

When the optimal fusion signal processing path is derived through this process, the fusion processing result can be obtained by selectively processing the telemetry signals along the searched signal processing path, and in the end, optimal telemetry data can be obtained. .

The information on the frame error score, reference time information, and parallax information collected during the single processing of the above-described telemetry signal is used not only in the search for the optimal signal path, but also in the fusion processing process, thereby synchronizing a state between a plurality of telemetry signals. Can be maintained, and signal search time can be greatly reduced.

Hereinafter, specific details will be described with reference to the accompanying drawings.

2 is a diagram for explaining each frame of a plurality of telemetry signals according to an embodiment of the present invention.

In FIG. 2, the j-th frame S _i F _j of the signal acquired by the i-th receiving system is represented by a circle as shown in FIG. 2.

Also, the time at which the j-th frame was acquired in the i-th receiving system is denoted as t _ij .

In addition, the difference between the acquisition time of the j-th frame acquired by the i-th receiving system and the acquisition time of the j+1-th frame is denoted as Δt _ij .

For convenience, only the acquisition time of the j-th frame in the first receiving system is displayed on the time (t) axis of FIG. 1.

As shown in FIG. 2, even if the frame is continuously acquired in the same receiving system, Δt _ij and Δt _ij+1 may be different from each other (Δt _ij ≠ △t _ij+1 ), and △t _ij and △t _{ij +1} may be different from each other (△t _ij ≠ Δt _{ij +1} ).

3 is a diagram for describing a method of calculating a correction time of each frame of a telemetry signal based on an event frame according to an embodiment of the present invention.

In FIG. 3, the telemetry signals are visually aligned based on the frame F ₃ in which a random event occurs among the frames of each signal shown in FIG. 2. For convenience, the time t ₁₃ at which the third frame was acquired by the first receiving system was selected as the reference time, and the parallax was calculated based on this.

Even if the alignment is based on F ₃ , Δt _ij remains the same as in FIG. 2, but the time t _i3 at which F ₃ is acquired in the i-th receiving system is different during the alignment process.

In FIG. 3, for convenience, the remaining telemetry signals are aligned based on the telemetry signal acquired from the first receiving system, so the time at which the third frame of the i-th receiving system is acquired can be corrected to be the same as t _i3 . Correction times corrected by the difference between t _i3 and t ₁₃ may be calculated, respectively.

Also, for the remaining frames of the i-th receiving system, correction times corrected by a difference between t _ij and t _1j based on the telemetry signal of the first receiving system may be calculated, respectively.

Accordingly, it is possible to synchronize the telemetry signal acquired by another receiving system based on the telemetry signal acquired by the first receiving system.

4 is a diagram for explaining a problem when an error occurs in an event frame according to an embodiment of the present invention.

In order to apply the synchronization acquisition method as shown in FIG. 3, it is necessary to premise that all frames included in the telemetry signal do not contain errors. However, in general wireless mobile communication, an error-free system rarely exists in probability, and as shown in FIG. 4, F ₃ of the telemetry signal S ₃ obtained from the third receiving system may be a frame in which an error occurs. have.

At this time, since an error occurred in F ₃ , which is a frame in which a random event occurred, S ₃ could not acquire synchronization with the signal S ₁ acquired from the first receiving system, and it was clear which frames after F ₃ were. It becomes impossible to know.

That is, the time difference Δt _3j between successive frames can be known, but when time alignment is performed with a signal from the first receiving system, correction time information of S ₃ cannot be calculated.

Accordingly, in order to overcome this problem, it is necessary to calculate the correction time between frames by using auxiliary information such as a simple counter among data constituting the frame, which will be described with reference to FIG. 5.

5 is a diagram for describing a method of calculating a correction time of an event frame in which an error has occurred, according to an embodiment of the present invention.

In the same situation as in FIG. 4, in the same situation as in FIG. 4, a simple counter is additionally included in the frame, and the counter value included in the j-th frame is displayed as D _j . In addition, the difference between the counter value included in the j-th frame and the counter value included in the j+1-th frame acquired by the i-th receiving system is expressed as _{Δd ij} .

If we assume that there is no one F _4, the error obtained in the F ₃ after the S _3, the counter value included in the F ₄ is D _4, in which the value of the counter included in the F ₄ in S ₁ obtained from the first receiving system It will be equal to the value D ₄ .

Therefore, it is possible to three cars time after receiving the F ₃ and F ₄ in the second reception system to be estimated to be equal to the F ₃ and F ₄ the time difference △ t ₁₃ receiving at the first receiving system.

Accordingly, the three receiving the F ₃ of the second receiving system time t ₃₃ are F ₃ and F ₄ the time difference △ t ₁₃ receiving in three time information after receiving the F ₄ in the second receiving system t ₃₄ to the first receiver system It can be calculated using That is, in the third reception system, the reception time t ₃₃ of F ₃ may be calculated as t ₃₄ -Δt ₁₃ .

By repeatedly applying this calculation procedure to the error frame, it is possible to obtain corrected time information based on the event occurrence time in the first receiving system for all frames of the telemetry signal acquired by the i-th receiving system.

6 is a flowchart illustrating a method of calculating an error score for a frame included in a telemetry signal according to an embodiment of the present invention.

First, it is determined whether there is an error check function (S61). This is because when an error check function such as a cyclic error check code is activated, it is relatively easy to grasp the error state of a frame. If there is an error check function (S61:Y), it is checked whether there is an error, and if there is no error (S62:N), a weight a and a weight b if there is an error (S62:Y) are assigned.

If there is no error check function (S61:N), since it is difficult to intuitively determine whether or not an error has occurred, it is determined whether the counter value is good (S62). In other words, it is determined whether there is an error by checking the continuity of the counter value, which is the auxiliary information, as a numerical value.

If the continuity of the counter value is maintained, it is determined that the counter value is good (S63:Y), and the weight c is assigned, and if the continuity of the counter value is not maintained, it is determined that the counter value is not good (S63:N). , It is determined whether there is an error according to the goodness of the frame boundary pattern (S64).

If the frame boundary pattern is good (S64:Y), the weight d is assigned, and if not (S64:N), the weight e is assigned.

Thereafter, the error score of the current frame is calculated by combining the error score of the previous frame and the weight of the current frame, and the calculated error score is stored in the analysis file (S65). At the same time, the error score of the current frame is stored as data for calculating the error score of the next frame.

7A and 7B are flowcharts illustrating a method of searching for an optimal signal processing path while maintaining synchronization of a plurality of telemetry signals according to an embodiment of the present invention.

Referring to FIG. 7A, if the optimal signal processing path is searched by analyzing frame information of one selected telemetry signal, it is determined whether there is more frame analysis information of the searched signal (S711). When there is more frame analysis information of the signal to be searched (S711:Y), it is determined whether the frame error score is greater than or equal to the threshold value by comparing the frame error score with a preset threshold (S712).

If the frame error score is greater than or equal to the threshold (S712:Y), the frame is determined to be a normal frame, and if not (S712:N), a procedure of switching the search path to another signal is performed. It will be described in detail.

When the frame error score is greater than or equal to the threshold value (S712:Y), current frame information is added to the optimal signal path (S713). Thereafter, it is determined whether or not the frame is continuously searched for more than a preset time (S714), and if the frame is continuously searched for more than a preset time (S714:Y), the second synchronization is performed to continuously maintain synchronization with other signals. Perform procedure (70). Otherwise (S714:N), frame information of the signal currently being searched is continuously analyzed.

The secondary synchronization procedure 70 will be described with reference to FIG. 7B.

First, an expected time synchronization interval is calculated by referring to the corrected parallax calculated by the first synchronization (S716). Specifically, by combining the time difference corrected in the first synchronization procedure and the frame time of the telemetry signal being searched, the time synchronization period of the synchronization frame expected from the other preliminary signals is calculated.

At this time, the reason for calculating the time synchronization period information without calculating specific time information is that the period of the signal itself may change due to various factors such as fluctuation of the local clock or change in the communication environment.

Thereafter, it is checked whether frame information to be analyzed is further included in other preliminary signals (S717). When there are no more frames to be analyzed (S717:N), it is determined whether or not frame search of all signals has been completed, and the procedure is terminated or other preliminary signals are selected and searched.

Specifically, if the frame search of all signals has not been completed (S717:N), the frame error score of the other synchronized signal and the frame error score of the signal being searched are compared (S726). If the frame error score of the other synchronized signal is greater than the frame error score of the signal being searched (S726:Y), the search for the optimal path is continued by selecting the synchronized signal, and if not (S726:N) , The signal is re-searched and the procedure shown in FIG. 7A is repeated.

On the other hand, if there are more frames to be analyzed (S717:Y), it is determined whether the correction time of the selected preliminary signal is included in the expected time synchronization period (S718).

In this case, when the correction time of the preliminary signal is included in the expected time synchronization period (S718:Y), it is determined whether the frame error score of the preliminary signal is greater than or equal to a threshold value (S720). This is to first check the error state of the frame because the counter value is valid only when the frame is good.

If the error score of the frame is greater than or equal to the threshold value (S720:Y), it is determined whether the counter values match (S722), and if they do match, synchronization is considered successful, and if not, synchronization is deemed to have failed. This result is recorded as the synchronization state and correction information of the preliminary signal (S724), and the selected preliminary signal is converted to the next preliminary signal (S725), and the secondary synchronization procedure 70 is repeatedly performed.

If the error score of the frame is less than the threshold value (S720:N), it is difficult to determine whether synchronization is successful because the counter value is not known. Therefore, in this case, time correction and comparison are performed based on the information of the next frame (S723).

On the other hand, if the correction time of the preliminary signal is not included in the expected time synchronization period (S718:N), it is determined whether the frame time of the preliminary signal is later than the end time of the expected synchronization period (S721). If the frame time of the preliminary signal does not exceed the synchronization period (S721:N), time correction and comparison are repeated based on the next frame information of the selected preliminary signal (S723), but the frame time of the preliminary signal is synchronized. If the interval has been exceeded (S721:Y), it is determined that synchronization for the preliminary signal has failed and is recorded (S724).

8 is a flowchart for briefly explaining a signal processing method according to an embodiment of the present invention.

First, a plurality of telemetry signals having a frame structure are received (S810).

Thereafter, an event frame in which a random event has occurred is detected from the plurality of received telemetry signals (S820).

Thereafter, a time difference between the reception time of the event frame detected from the remaining telemetry signals is calculated based on the reception time of the event frame detected from any one telemetry signal (S830).

In this case, when it is determined that any one of the event frames included in the plurality of telemetry signals has an error, the reception time of the event frame in which the error exists may be estimated based on a counter included in the frame in which the error does not exist. .

Here, a weight sum is calculated based on at least one of a frame boundary pattern, continuity of auxiliary information included in each frame, and error detection code information, and each frame included in a plurality of telemetry signals based on the calculated weight sum. It is possible to determine whether there is an error.

Thereafter, the calculated parallax is corrected to synchronize the plurality of telemetry signals based on the event frame (S840).

Thereafter, an optimal path for fusion of a plurality of synchronized telemetry signals is searched (S850).

In this case, an error score of each frame is calculated based on the calculated weight sum, and based on the calculated error score, any one frame among frames included in a plurality of synchronized telemetry signals is selected and fused. It is possible to search for an optimal path for fusion of a plurality of synchronized telemetry signals.

Also, based on the time difference corrected in the first synchronization period and the frame time of the telemetry signal currently being searched, each expected section including the frame time to be corrected in the second synchronization period is calculated, and correction of the selected other telemetry signal Synchronization can be maintained by detecting whether the calculated frame time is included in the calculated expected interval and the counter value coincides to determine whether to synchronize.

According to various embodiments of the present invention as described above, it is possible to process a plurality of telemetry signals as optimal single telemetry data. Therefore, the overall telemetry data processing time can be drastically reduced.

In addition, errors in the fusion-processed telemetry data are greatly reduced, so that the data transmitted from the target to be measured can be accurately analyzed, and the situation can be determined clearly.

The signal processing method according to the various embodiments described above may be implemented as a program and stored in various recording media. That is, a computer program that is processed by various processors and capable of executing the various signal processing methods described above may be used in a state stored in a recording medium. For example, i) receiving a plurality of telemetry signals composed of a frame structure, ii) detecting an event frame in which an event has occurred from the plurality of received telemetry signals, iii) any one telemetry signal Calculating a parallax of the reception time of the event frame detected from the remaining telemetry signals based on the reception time of the event frame detected from the event frame, iv) correcting the calculated parallax to convert a plurality of telemetry signals into the event frame. A non-transitory computer readable medium storing a program that performs the step of synchronizing based on and iv) searching for an optimal path for fusion of a plurality of synchronized telemetry signals may be provided. have.

The non-transitory readable medium refers to a medium that stores data semi-permanently and can be read by a device, not a medium that stores data for a short moment, such as a register, cache, or memory. Specifically, the above-described various applications or programs may be provided by being stored in a non-transitory readable medium such as a CD, DVD, hard disk, Blu-ray disk, USB, memory card, and ROM.

On the other hand, although the preferred embodiments of the present invention have been illustrated and described above, the present invention is not limited to the specific embodiments described above, and the technical field to which the present invention belongs without departing from the gist of the present invention claimed in the claims. In addition, various modifications may be possible by those of ordinary skill in the art, and these modifications should not be individually understood from the technical spirit or prospect of the present invention.

100: signal processing device 110: receiver
120: processor

Claims (10)

In the signal processing device,
A receiver configured to receive a plurality of telemetry signals in a frame structure; And
Detecting an event frame in which an event has occurred from the plurality of received telemetry signals, and the remaining telemetry signals based on the reception time of the event frame detected from any one of the plurality of telemetry signals Each time difference of the reception time of the event frame detected from is calculated, the plurality of telemetry signals are synchronized based on the event frame by correcting the calculated time difference, and the plurality of synchronized telemetry signals are A signal processing apparatus comprising a; processor for searching a path for fusion. The method of claim 1,
The processor,
When it is determined that there is an error in any one of the event frames included in the plurality of telemetry signals, estimating the reception time of the event frame in which the error exists based on a counter included in the frame in which the error does not exist. Signal processing device characterized by. The method of claim 2,
The processor,
A weight sum is calculated based on at least one of a frame boundary pattern, continuity of auxiliary information included in each frame, and error detection code information, and each frame included in the plurality of telemetry signals based on the calculated weight sum. Signal processing apparatus, characterized in that to determine whether or not an error. The method of claim 3,
The processor,
A method of calculating an error state score of each frame based on the calculated sum of weights, and selecting and fusing any one frame among the frames included in the plurality of synchronized telemetry signals based on the calculated error state score And searching for a path for fusion of the plurality of synchronized telemetry signals. The method of claim 4,
The processor,
Based on the time difference corrected in the first synchronization period and the frame time of the telemetry signal currently being searched, each expected section including the frame time to be corrected in the second synchronization period is calculated, and the corrected frame of the selected other telemetry signal And determining whether to synchronize by detecting whether the time is included within the calculated expected interval and the counter values coincide. As a signal processing method performed by a signal processing device,
Receiving a plurality of telemetry signals having a frame structure;
Detecting an event frame in which a random event has occurred from the plurality of received telemetry signals;
Calculating a parallax of a reception time of the event frame detected from the remaining telemetry signals based on a reception time of the event frame detected from any one of the plurality of telemetry signals;
Synchronizing the plurality of telemetry signals based on the event frame by correcting the calculated parallax; And
And searching a path for fusing the plurality of synchronized telemetry signals. The method of claim 6,
The calculating step,
When it is determined that there is an error in any one of the event frames included in the plurality of telemetry signals, estimating the reception time of the event frame in which the error exists based on a counter included in the frame in which the error does not exist. Signal processing method characterized by. The method of claim 7,
The calculating step,
A weight sum is calculated based on at least one of a frame boundary pattern, continuity of auxiliary information included in each frame, and error detection code information, and each frame included in the plurality of telemetry signals based on the calculated weight sum. Signal processing method, characterized in that to determine whether or not an error. The method of claim 8,
The searching step,
A method of calculating an error state score of each frame based on the calculated sum of weights, and selecting and fusing any one frame among the frames included in the plurality of synchronized telemetry signals based on the calculated error state score And searching for a path for fusion of the plurality of synchronized telemetry signals. The method of claim 9,
The searching step,
Based on the time difference corrected in the first synchronization period and the frame time of the telemetry signal currently being searched, each expected section including the frame time to be corrected in the second synchronization period is calculated, and the corrected frame of the selected other telemetry signal And determining whether to synchronize by detecting whether the time is included in the calculated expected interval and the counter values coincide.

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