JP2019074396A - Jitter pulse train analyzer and method for analyzing jitter pulse train - Google Patents

Abstract

To provide a jitter pulse train analyzer that can detect a pulse skip regardless of the set value of the pulse interval set by the transmitter of the pulse train.SOLUTION: When a change amount R, calculated on the basis of the pulse interval PI of each pulse of the pulse train acquired by detecting pulse signals received by a reception antenna, becomes out of the range of a threshold value (lower limit Rand upper limit R), calculated on the basis of a change width Hw with respect to the average value of a pulse interval PI, there is determined generation of a pulse skip meaning that a pulse signal cannot be received after a pulse signal with the change amount R.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a jitter pulse train analysis device and a jitter pulse train analysis method.

  The jitter pulse train analysis device receives a pulse signal from the transmission antenna and obtains a pulse train by detecting the received pulse signal.

  Since the number of pulses of the pulse signal constituting this pulse train is enormous, the analysis apparatus uses automatic analysis to calculate the specifications (for example, characteristics) of the pulse train. However, automatic analysis of this pulse train may be difficult.

  As one of the causes, there is a pulse drop which causes a time zone in which a pulse train can not be received during observation.

  Pulse missing is a phenomenon in which a pulse signal can not be received for a certain period of time, and the pulse train is missing in that certain period. Such a phenomenon occurs because, for example, a rotational scan of a transmitting antenna generates a time zone in which the main lobe transmitted by the transmitting antenna does not face the receiver.

  As a result, a long period from when the pulse signal is not received until when the pulse signal is received again is recorded as a pulse interval, and the value becomes very large compared to the original pulse interval, and It interferes with proper analysis of features.

  In the prior art, automatic analysis was performed while leaving a large pulse interval generated by such missing pulses, so calculation of specifications of the pulse signal was a factor of misanalysis.

JP, 2008-281517, A

  In order to prevent the erroneous analysis, in many cases, a threshold is set in advance for the pulse interval, and a pulse signal having a pulse interval exceeding the threshold is excluded as an outlier before automatic analysis is performed.

  However, when performing automatic analysis of a pulse train on the receiving side, the threshold value is often set to an arbitrary value, and thus, when an unknown pulse train is received and analyzed, the above-described arbitrary setting is performed. There was a problem that the threshold was not always appropriate.

  This is because the transmitter can freely set the pulse interval, and the pulse interval representing the feature of the pulse train may exceed the threshold arbitrarily set on the receiving side.

  As described above, when the threshold value set on the receiver side is not an appropriate value, it is not possible to classify the pulse interval generated due to the missing pulse and the pulse interval representing the feature of the pulse train, and misanalysis Or I was unable to analyze.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a jitter pulse train analysis apparatus and jitter pulse train analysis method capable of detecting pulse dropout regardless of the setting value of pulse interval by the transmitter.

  In the jitter pulse train analysis device according to the embodiment, a pulse train specification measurement processing unit that detects an interval of pulse signals forming the received pulse train, a variation amount of the interval of the pulse signal detected by the pulse train specification measurement processing unit, A pulse interval change amount calculation processing unit that calculates the lower limit value and the upper limit value of the change amount based on a change width with respect to the interval of the pulse signal and the average value of the interval of the pulse signal; When the change amount of the interval of the pulse signal detected by the unit is out of the lower limit value and the upper limit value of the change amount calculated by the pulse interval change amount calculation processing unit, the upper limit value of the change amount is exceeded. A pulse drop detection processing unit that determines that the pulse signal can not be received after the pulse signal, and a pulse train detected by the pulse train specification measurement processing unit; The pulse train division processing unit divides the pulse train into a plurality of pulse groups, and divides the pulse train into a plurality of pulse groups, and divides the pulse train into a plurality of pulse groups for each of the plurality of pulse groups divided by the pulse train division processing unit. And a pulse train automatic analysis processing unit that analyzes specifications.

FIG. 2 is a block diagram showing each functional unit of the jitter pulse train analysis device 10 according to the embodiment. FIG. 6 is a diagram showing that a pulse drop has occurred in a pulse train received by a receiving antenna 11 in the jitter pulse train analysis device 10; FIG. 6 is a diagram showing a series of flows until specifying the specifications of the received pulse train by analyzing the pulse train received by the receiving antenna 11;

  Hereinafter, a jitter pulse train analyzer and a jitter pulse train analysis method according to the embodiment will be described with reference to the drawings.

  FIG. 1 is a block diagram showing each functional unit constituting the jitter pulse train analyzer 10. As shown in FIG.

  The jitter pulse train analysis apparatus 10 includes a receiving antenna 11, a pulse train specification measurement processing unit 12, a pulse interval change amount calculation processing unit 13, a pulse drop detection processing unit 14, a pulse train division processing unit 15, and a pulse train automatic analysis processing unit 16. .

  The jitter pulse train analysis device 10 includes a CPU (computer) that controls the device 10 according to a device control program stored in advance in a storage unit (not shown) such as a ROM. A CPU operating according to the device control program functions as the pulse interval change amount calculation processing unit 13, the pulse drop detection processing unit 14, the pulse train division processing unit 15, and the pulse train automatic analysis processing unit 16.

  That is, when the pulse train specification measurement processing unit 12 detects the pulse signal received by the receiving antenna 11 and acquires a pulse train, the pulse interval change amount calculation processing unit 13 and the pulse loss detection processing unit 14 according to the device control program. The following processes are executed by the CPU functioning as the pulse train division processing unit 15 and the pulse train automatic analysis processing unit 16. The processing by the pulse train specification measurement processing unit 12 to the pulse train automatic analysis processing unit 16 will be described with reference to FIGS. 2 and 3.

  FIG. 2 is a diagram showing that one pulse drop occurs in the received pulse train.

  FIG. 3 is a diagram showing a series of flows until the specifications of the received pulse train are identified by analyzing the received pulse train.

Specifically, FIG. 3 (a) is a diagram showing a state where two pulse omissions (hereinafter, first pulse omission and second pulse omission) occur in the received pulse train, and FIG. 3 (b) Is a diagram showing a pulse interval PI for each pulse signal arranged in accordance with a number given in the order of arrival, and (c) of the figure shows the variation of each pulse signal calculated from the pulse interval PI shown in (b) of the same It is the figure which showed R and the threshold value (lower limit R _L , upper limit R _U ) for deriving the said 1st, 2nd pulse omission, and the figure (d)-the figure (f) are It is a figure which shows the mode of analysis of an averaging process etc. about each of the pulse train 1-pulse train 3 obtained by dividing | segmenting a pulse train in front of and behind the detected 1st and 2nd pulse omission.

  The receiving antenna 11 receives the pulse signal transmitted by the transmitting antenna, and outputs the received pulse signal to the pulse train specification measurement processing unit 12 in the subsequent stage.

  The pulse train specification measurement processing unit 12 performs detection of pulse signals received by the receiving antenna 11, and adds a pulse number to each of the pulse signals in the order of arrival time of each pulse signal constituting the pulse train, as well as adjacent Function to measure an interval PI (hereinafter referred to as a pulse interval PI) with respect to the pulse signal to be transmitted.

  First, FIG. 2A shows how pulse numbers 1, 2, 3, 4... Are assigned to the pulse signals detected by the pulse train specification measurement processing unit 12 in the order of arrival time.

  Furthermore, after the pulse train specification measurement processing unit 12 assigns a pulse number to each pulse signal, the pulse interval PI (1), PI (2), PI (3), PI (4),. ), ..., PI (n) are sequentially measured (n: natural number).

  FIG. 2B is a diagram in which the pulse number is set on the vertical axis and the pulse interval PI is set on the horizontal axis, and the pulse signals shown in FIG. 2A are arranged in the order of pulse numbers. It is.

  Here, each value (measurement result) of the pulse interval PI (1), PI (2), PI (3), PI (4), ..., PI (25), ..., PI (n) is T1, , T25,..., Tn. Among them, T25 is, for example, 7 times as long as T1, and T1 = T2 = T3 = T4 = T4 other than this T25.

The pulse interval change amount calculation processing unit 13 calculates the change amount (hereinafter referred to as change amount R (n)) of the pulse interval PI between adjacent pulse signals, and also obtains the possible width of this change amount R (n) It has a function of calculating the lower limit value R _L and the upper limit value R _U ).
First, the following equation (1) is used to calculate the change amount R (n) by the pulse interval change amount calculation processing unit 13.
R (n) = PI (n) / PI (n-1) (1)
According to the equation (1), the change amount R (n) is calculated using the pulse interval PI (n) measured by the pulse train specification measurement processing unit 12. Therefore, according to the measurement result, the amount of change R (1) = R (2) = R (3) = R (4) = R (n) = 1.

  However, since T25 in the pulse interval PI (25) is, for example, 7 × T1, it is calculated from equation (1) that the variation R (25) = 7, and it is assumed that PI (26) = 1 Change amount R (26) = 0.14 = (1/7), and the change amounts R (25) and (26) are values “1” of the change amounts R (1) to R (4). The value is out of the

  As described above, the amount of change R before and after the pulse signal in which the pulse drop has occurred is continuous with an extremely large value and a small value as compared with the amount of change R obtained by the normally received pulse signal.

Next, the pulse interval change amount calculation processing unit 13 calculates possible values (lower limit value R _L and upper limit value R _U ) of the change amount R (n) of the pulse signal.
Here, the case where the pulse interval PI changes due to pulse modulation is considered.
In this case, the change width Hw of the pulse interval PI due to the pulse modulation changes with a width w [%] (hereinafter, change rate w [%]) with respect to the average value PI _avr of the pulse interval PI appearing in the pulse train Suppose that.

Then, the pulse interval PI changes in a range of ± w / 2 [%] of the average value PI _avr of the pulse interval PI.

  As a result, the amount of change R (n) obtained by the ratio of the pulse interval PI between the n-th and (n-1) -th adjacent pulse signals in a pulse train without pulse loss, for example, is represented by Take a range of values.

Here, PRI _mean represents the average value of the incoming pulse interval PI. The following equation (3) can be obtained by arranging the equation (2).

As shown in the equation (3), when the equation (2) is rearranged, it is not necessary to take into consideration the PRI _mean , and the pulse interval PI is concerned only with the changing width (rate of change w [%]) of the changing width Hw. The lower limit value R _L and the upper limit value R _U of the amount of change R (n) can be obtained.

The pulse interval change amount calculation processing unit 13 uses the change amount R (the lower limit value R _L and the upper limit value R _U ) obtained by the equation (3) as a threshold value of the change amount R (n) of the pulse signal. It is output to the pulse loss detection processing unit 14 in the subsequent stage.

Here, the lower limit value R _L and the upper limit value R _U are represented by the following formulas (4) and (5).

The pulse dropout detection processing unit 14 generates the pulse dropout location based on the threshold value (lower limit value R _L and upper limit value R _U ) of the change amount R of the pulse signal received from the pulse interval change amount calculation processing unit 13. The first pulse missing, second pulse missing, see FIG. 3 (a) are detected, and the pulse signal immediately before the detected pulse missing occurs is divided into pulse trains in the latter stage using the number given to that pulse signal. Output to the processing unit 15.

For example, when w = 2% in the above equation (4) and equation (5), the lower limit R _L = 99/101 = 0.98 and the upper limit R _U = 101/99 = 1.02.

Therefore, as shown in FIG. 3C, the pulse loss detection processing unit 14 determines that the variation R (n) of each received pulse signal has a lower limit R _L (= 0.98) and an upper limit R _U It is determined whether the value deviates from 1.02). Here, it is assumed that the pulse interval PI has a large value, for example, (T1 × 7) for the n = 22nd and n = 44th pulse signals that have arrived.

  In this case, R (22) = R (44) = 7 is calculated, and R (23) = R (45) = 0.14 = (1/7).

For this reason, in the pulse dropout detection processing unit 14, for example, the n = 22nd and n = 44th pulse signals are out of the upper limit value R _U (= 1.02), and the next (n + 1) = 23rd and (n + 1) Since it detects that the 45th pulse signal has deviated from the lower limit value R _L (= 0.98), the pulse train division processing section processes the numbers given to the pulse signal (here, the 22nd and 44th). Output to 15.

  As shown in FIG. 3 (d) to FIG. 3 (f), the pulse train division processing unit 15 determines the 22nd based on the pulse numbers (n = 2nd, 44th) received from the pulse missing detection processing unit 14. And the 44th pulse signal, the pulse train received by the receiving antenna 11 is divided into a pulse train 1, a pulse train 2 and a pulse train 3.

  The pulse train automatic analysis processing unit 16 executes analysis processing on the pulse trains 1 to 3 shown in FIG. 3 (d) to FIG. 3 (f). Specifically, after deleting the largest pulse signal (pulse signal at the end of pulse train 1 to pulse train 3) given in pulse train 1 to pulse train 3 and then dividing the pulse train for each pulse train The averaging process of the interval PI is performed to determine the identity of the pulse signal.

  For example, as a result of performing the averaging process, when the average value of the pulse intervals PI of the pulse train 1 and the pulse train 2 is the same and the pulse train 3 is different from the average value, the pulse train 1 and the pulse train It is determined that the transmission source that transmitted 2 and the transmission source that transmitted pulse train 3 are different.

Therefore, according to the jitter pulse train analysis device 10 having the above configuration, the variation R calculated based on the pulse interval PI of each pulse signal constituting the pulse train obtained by detecting and acquiring the pulse signal received by the receiving antenna 11 is a pulse A pulse that can not receive a pulse signal after a pulse signal having the change amount R when the threshold (lower limit value R _L and upper limit value R _U ) calculated based on the change width Hw with respect to the average value of the interval PI is deviated It is determined that a dropout has occurred.

Thus, the possible value of change amount R (n) obtained by the ratio of pulse interval PI between adjacent pulse signals is calculated using a value corresponding to change width Hw relative to average value PI _avr of pulse interval PI. By setting the threshold values (lower limit value R _L and upper limit value R _U ) as in the equation (4) and the equation (5) based on the equation (2), even the unknown pulse train can be transmitted by the sender The pulse dropout can be detected regardless of the setting value of the pulse interval PI of the pulse train due to the pulse interval PI, and the pulse interval PI generated by the pulse dropout can be classified into the pulse interval PI representing the feature of the pulse train. Can solve such problems. This is because the change amount R (n) of the adjacent pulse interval PI is used instead of setting the absolute value as the threshold value for the pulse interval PI.

  Furthermore, according to the jitter pulse train analysis device 10 having the above configuration, the pulse train received by the receiving antenna 11 is divided by a pulse signal having a variation R outside the threshold value, and the divided pulse trains (first pulse group The average value process of the variation R is performed every third pulse group), and for example, the analysis of the identity is performed on the averaging process.

  Thereby, when calculating the specifications of the divided pulse trains, for example, when the average value of pulse train 1 and pulse train 2 is different from the average value of pulse train 3, the pulse train 1 and the pulse train 2 are transmitted from the same transmission source Thus, it can be determined that the pulse train 3 is a pulse train transmitted from a different source.

  The present invention is not limited to the above embodiment, and can be variously modified in the implementation stage without departing from the scope of the invention. Furthermore, the above embodiments include inventions of various stages, and various inventions can be extracted by appropriate combinations of a plurality of disclosed configuration requirements. For example, even if some structural requirements are deleted from all the structural requirements shown in the embodiment or some structural requirements are combined in different forms, the problems described in the section of the problems to be solved by the invention are If the problem can be solved and the effects described in the column of the effects of the invention can be obtained, a configuration in which the components are eliminated or combined can be extracted as the invention.

DESCRIPTION OF SYMBOLS 10 Jitter pulse train analysis apparatus 11 Reception antenna 12 Pulse train specification measurement processing part 13 Pulse interval change calculation processing part 14 Pulse missing detection processing part 15 Pulse train division processing part 16 Pulse train automatic processing Analysis processing unit, PI: pulse interval, R: change amount, PI _avr : average value.

Claims (5)

A pulse train specification measurement processing unit that detects an interval of pulse signals constituting the received pulse train;
The change amount of the interval of the pulse signal detected by the pulse train specification measurement processing unit and the lower limit value and the upper limit value of the change amount are the change width of the interval of the pulse signal and the average value of the interval of the pulse signal. A pulse interval change amount calculation processing unit which is calculated based on
When the change amount of the interval of the pulse signal detected by the pulse train specification measurement processing unit is out of the lower limit value and the upper limit value of the change amount calculated by the pulse interval change amount calculation processing unit, the change A pulse drop detection processing unit that determines that the pulse signal can not be received after the pulse signal that has exceeded the upper limit of the amount;
A pulse train division processing unit which divides the pulse train detected by the pulse train specification measurement processing unit by a pulse signal exceeding the upper limit value of the change amount and divides the pulse train into a plurality of pulse groups;
A pulse train automatic analysis processing unit that analyzes specifications of each of the plurality of pulse groups divided by the pulse train division processing unit;
Jitter pulse train analyzer comprising:   The jitter pulse train analysis device according to claim 1, wherein the change width of the pulse signal interval with respect to the average value changes in a range of a percentage of a value obtained by dividing a preset value by 2 with respect to the average value of the interval. . The change amount of the interval of the pulse signal is calculated based on a ratio of pulse intervals of adjacent pulse signals detected by the pulse train specification measurement processing unit,
The lower limit value and the upper limit value indicating the possible range of the change amount of the interval of the pulse signal are, where R is the change amount and w is the preset value.
The jitter pulse train analysis device according to claim 2, wherein   The pulse train automatic analysis processing unit analyzes, for each of the plurality of divided pulse groups, an average value of intervals of pulse signals constituting a pulse train excluding the last pulse signal in the pulse group. The jitter pulse train analyzer according to any one of claims 3 to 10. A method of analyzing a jitter pulse train by a computer,
Detecting an interval of pulse signals constituting a received pulse train;
Calculating a lower limit value and an upper limit value of the change amount of the detected pulse signal interval based on the change width of the received pulse signal interval;
When the amount of change in the interval of the detected pulse signal is out of the calculated lower limit value and the upper limit value, the pulse signal can be received after the pulse signal exceeding the upper limit value of the amount of change. To judge that it was not
Dividing the detected pulse train by a pulse signal exceeding the upper limit of the change amount, and dividing the pulse train into a plurality of pulse groups;
Analyzing specifications of each of the plurality of divided pulse groups for each of the divided pulse groups;
Jitter pulse train analysis method comprising: