JP2011237340A - Apd measurement instrument - Google Patents

Abstract

PROBLEM TO BE SOLVED: To display whole measurement result data on a graph display screen.SOLUTION: An APD measurement instrument includes a level detection part 200; an APD part 300; a storage part 400; a display part 600; an operation part 700, and a display control part 500. The display control part 500 allows the display part 600 to display a graph where one from a frequency, amplitude, amplitude probability, and time is defined as a parameter in a coordinate where two or three from them are defined as dimensions, based on a latest storage content of the storage part 400, which is obtained by performing access to the storage part 400 at a prescribed timing. In this case, whole APD measurement results of the measurement channels or measurement time are displayed in the display part 600 as a graph which is limited by the number of display points of the display part 600 by averaging or thinning the APD measurement results by the predetermined number of measurement channels or measurement time.

Description

  The present invention analyzes the frequency component of a signal, and the probability that the magnitude of each frequency component exceeds a predetermined threshold value during a predetermined time (referred to as amplitude probability distribution or simply a time rate, hereinafter referred to as “APD”). ).

  An APD measurement technique has been conventionally used. For example, there is a technique of Patent Document 1 that measures APD with high amplitude resolution and time resolution. As an example of applying various techniques to a spectrum analyzer or the like, various displays have been proposed. There is technology.

  On the other hand, recently, there is a demand for the simultaneous measurement of APDs having a predetermined plurality of frequency components in parallel by a communication method. For example, as described in Non-Patent Document 1, a standard for digital terrestrial broadcasting is defined as an ARIB standard by the Radio Industries Association (ARIB), and a modulation method based on OFDM (Orthogonal Frequency Division Multiplex Operation Mode) is defined. In this OFDM system, transmission data is divided into thousands of low-speed data in a predetermined band, and digital modulation is performed. For example, the predetermined band is about 5.6 MHz, and the transmission data is divided into carrier units of about 1 kHz, and is digitally modulated into a total of 5,600 lines.

  Therefore, it is desired that the APD measurement in the OFDM system is performed by analyzing the frequency of the signal component about every 1 kHz and measuring the APD of each frequency component in parallel. Moreover, it can measure in parallel with the APD described in Patent Documents 1 and 2.

  Regarding the display of the APD, in Patent Document 2, the probability distribution is displayed in a band for each probability range, so that the distribution is identified and displayed so as to be easily visible.

Japanese Patent No. 3156152 Japanese Patent No. 3374154

Toshiba Review VOL. 58 No. 12 (2003), p. 2-6

  By the way, in a measurement under a communication environment having a huge number of channels over a dense frequency band as in the OFDM method described above, amplitude changes in a large number of communication channels are measured at the same time, and the phenomenon is crushed over a wide level range. Multi-channel simultaneous APD measurement to grasp is an effective means.

  In this multi-channel simultaneous APD measurement, in order to effectively analyze the statistical tendency of the measurement signal, APD measurement results of the measurement channels (measurement frequency components) being simultaneously measured are displayed simultaneously as much as possible, and the measurement time is measured. It is desirable to be able to display the APD time variation for the whole.

  Multi-channel simultaneous APD measurement results easily analyze the causal relationship between each attribute of the measurement signal by displaying multiple types of graphs combining the four attributes of frequency / occurrence time / amplitude level / APD of the signal to be measured can do.

  However, as the measurement channel and measurement time increase, it becomes difficult to display all measurement result data due to restrictions on the number of display points (number of display pixels) on the screen (graph display area) for displaying the measurement results in a graph. The problem of coming.

  Therefore, the present invention has been made in view of the above problems, and an object thereof is to provide an APD measuring apparatus capable of displaying all measurement result data on a graph display screen.

In order to achieve the above object, an APD measuring apparatus according to claim 1 of the present invention includes a frequency analysis unit 100 that analyzes a frequency component of a signal under measurement, and a level at which the amplitude of each analyzed frequency component is detected. The detection unit 200, the APD unit 300 that obtains the amplitude probability per unit time for each detected amplitude of each frequency component, and the amplitude probability of each frequency component output by the APD unit corresponding to the passage of time The storage unit 400, the display unit 600, the operation unit 700, and the latest storage contents of the storage unit obtained by accessing the storage unit at a predetermined timing, the frequency, the amplitude, A display control unit 500 for displaying on the display unit a graph having two or three of the amplitude probabilities and the time as a dimension and the remaining one as a parameter; An APD measuring device,
The display control unit limits all the APD measurement results of the measurement channel or measurement time to the number of display points of the display unit by averaging or thinning out the APD measurement result for each preset measurement channel number or measurement time. The graph is displayed on the display unit as a graph.

The APD measuring device according to claim 2 is the APD measuring device according to claim 1,
The display control unit 500 assigns APD average values obtained by averaging the APD measurement results corresponding to the number of measurement channels or the measurement time corresponding to the total number of measurement channels divided by the number of display points to display on the display unit 600. It is characterized by doing.

The APD measuring device according to claim 3 is the APD measuring device according to claim 1,
The display control unit 500 assigns APD measurement results for each measurement channel or measurement time obtained by dividing the total number of measurement channels by the number of display points to each display point and displays the result on the display unit 600. .

The APD measuring device according to claim 4 is the APD measuring device according to claim 1,
The display control unit 500 measures the number of measurement channels corresponding to the total number of measurement channels divided by the number of display points, or the measurement channel with the maximum or minimum threshold level for the designated APD value from the APD measurement results for the measurement time. Alternatively, the APD measurement result of the measurement time is selected, assigned to each display point, and displayed on the display unit 600.

An APD measuring device according to claim 5 is the APD measuring device according to claim 1,
The display control unit 500 is configured to select a measurement channel having a maximum or minimum APD value at a specified threshold level from among APD measurement results corresponding to a number of measurement channels or measurement times obtained by dividing the total number of measurement channels by the number of display points. The APD measurement result of the measurement time is selected, assigned to each display point, and displayed on the display unit 600.

The APD measuring device according to claim 6 is the APD measuring device according to claim 1,
The display control unit 500 determines the APD of the measurement channel or measurement time at which the peak value level is maximum or minimum from the APD measurement results of the measurement channels or measurement times corresponding to the total number of measurement channels divided by the number of display points. A measurement result is selected, assigned to each display point, and displayed on the display unit 600.

The APD measuring device according to claim 7 is the APD measuring device according to claim 1,
The display control unit 500 determines the measurement channel or measurement time at which the instantaneous power average value is maximum or minimum from the APD measurement results of the measurement channels or measurement times corresponding to the total number of measurement channels divided by the number of display points. An APD measurement result is selected, assigned to each display point, and displayed on the display unit 600.

An APD measuring device according to claim 8 is the APD measuring device according to claim 1,
The display control unit 500 determines the measurement channel or measurement time at which the instantaneous voltage average value is maximum or minimum from the APD measurement results of the measurement channels or measurement times corresponding to the total number of measurement channels divided by the number of display points. An APD measurement result is selected, assigned to each display point, and displayed on the display unit 600.

The APD measuring device according to claim 9 is the APD measuring device according to claim 1,
The display control unit 500 measures the measurement channel or measurement time at which the peak-to-average power ratio is maximum or minimum from the APD measurement results of the measurement channels or measurement times corresponding to the total number of measurement channels divided by the number of display points. The APD measurement result is selected, assigned to each display point, and displayed on the display unit 600.

The APD measuring device according to claim 10 is the APD measuring device according to any one of claims 1 to 9,
A designated marker generating unit 520 that displays a designated marker that designates either a specific value or a specific range in two dimensions or parameters on the graph displayed on the display unit 600 as a specific value;
The display control unit 500 displays the APD measurement result at the location indicated by the designated marker displayed by the designated marker generation unit on the display unit as a numerical value.

  According to the present invention, all the measurement result data is displayed on the graph display screen using the condition items (for example, average value, arbitrary APD value, peak level value, etc.) to be noted from all the measurement result data. The number can be limited and displayed.

  In addition, since all the acquired measurement result data is held in the storage unit, it is displayed in a limited manner on the graph display, but the APD measurement at the location indicated by the designated marker displayed by the designated marker generation unit Since the result is numerically displayed on the display unit, all the APD measurement results at the location indicated by the designated marker can be visually confirmed.

It is a figure which shows the function structure of embodiment of the APD measuring apparatus which concerns on this invention. It is a figure for demonstrating the aspect of the graph displayed in this embodiment, and its switching aspect. It is a figure which shows the example of a graph which uses the amplitude (level) range as a parameter on the coordinate where time is fixed to a specific value, and frequency is abscissa and amplitude probability (APD) is ordinate. It is a figure which shows the example of a display of which a time is fixed to a specific value, and an amplitude probability (APD) range is a parameter on the coordinate which uses a frequency as a horizontal axis and a level as a vertical axis. It is a figure which shows the example of a graph which uses an amplitude probability (APD) range as a parameter on the coordinate which an amplitude (level) range is fixed to a specific value, a frequency is a horizontal axis and time is a vertical axis | shaft. It is a figure which shows the example of a graph which uses an amplitude (level) range as a parameter on the coordinate which makes an amplitude probability (APD) range fixed to a specific value, uses a frequency as a horizontal axis and time as a vertical axis. It is a figure which shows the example of a display of the graph of the coordinate which has a level range fixed to a specific value for every frequency (a frequency is a parameter), time is set as a horizontal axis, and an amplitude probability (APD) is set as a vertical axis | shaft. It is a figure which shows the example of a display of the graph of the coordinate which makes an amplitude probability (APD) range fixed to a specific value for every frequency (a frequency is a parameter), sets time as a horizontal axis and makes an amplitude (level) a vertical axis | shaft. It is a figure which shows the example of a display of the graph of the Rayleigh scale which uses a frequency as a parameter on the coordinate which makes an amplitude (level) a horizontal axis and uses APD as a vertical axis | shaft. It is a figure which shows the example of a display of the logarithmic graph which uses a frequency as a parameter on the coordinate which makes an amplitude (level) a horizontal axis and APD is a vertical axis | shaft. A display example of a graph using a frequency as a parameter on a three-dimensional coordinate with an amplitude (level) range fixed at a specific value, a frequency as a horizontal axis, an amplitude probability (APD) as a vertical axis, and time as an axis in the depth direction is shown. FIG. The figure which shows the example of a graph which uses a frequency as a parameter on the three-dimensional coordinate which fixes an amplitude (level) range to a specific value, uses a frequency as a horizontal axis, an amplitude (level) as a vertical axis, and time as an axis of the depth direction. It is. It is a figure for demonstrating a peak marker. It is a figure for demonstrating full span, a zone marker, and expansion / contraction. It is a figure which shows the example of a display of the average process method in the case of _Nmeas > _Ndisp . It is a figure which shows the example of a display of the average processing method in the case of _Nmeas <= _Ndisp . It is a figure which shows the example of a display of a thinning-out processing method. It is a figure which shows the other example of a display of a thinning-out processing method.

  DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments for carrying out the present invention will be specifically described with reference to the drawings.

Based on FIG. 1, a structure and operation | movement are demonstrated in order of operation | movement.
In FIG. 1, a frequency analysis unit 100 selects an input signal in a desired frequency band (broadband) to be measured, and further selects a desired signal in a narrower desired frequency band (narrowband). It comprises means 110, A / D conversion means 120, and frequency selection means 130. As band selection means 110, for example, if it is intended to measure noise in a high-frequency communication frequency band, a so-called heterodyne system as disclosed in Patent Document 2 can be adopted. That is, the input signal (noise) is mixed by a local oscillator and converted to a low frequency signal, and is limited to a frequency component in a necessary frequency band by using a band pass filter of a desired frequency band (δF). If the frequency band of the signal to be measured is low and the frequency band that can be directly used by the A / D conversion unit 120, the band selection unit 110 is not necessarily required.

  The A / D conversion means 120 receives the frequency component (signal) of the low frequency band-limited by the band selection means 110, and is fine with an amplitude (level) width ΔL by a clock of a period from a clock generator (not shown). (There is a threshold corresponding to this fineness.) Sampling (sampling) and converting to digital data. The amplitude probability (APD) to be obtained later is obtained for each fineness of the level width ΔL at the time of sampling.

  The frequency selection unit 130 receives a low-frequency signal over a frequency band of δF, and further includes a band-pass filter group of n (hereinafter also referred to as n (numerical value) channels or n (numerical value) CH). The frequency band is divided into fine frequency bands (δF / n). For example, if the channel of the communication line is every 1 kHz, n band-pass filters BPF1 to BPFn having a center frequency shifted by 1 kHz and a frequency band of approximately 1 kHz are provided. For example, the frequency selection unit 130 can perform a FFT process by software using a CPU as a filter bank.

  The level detection unit 200 includes detectors DET1 to DETn that detect amplitudes corresponding to the respective outputs of the bandpass filter of the frequency selection means 130, that is, amplitudes of the respective channels. The amplitude (level) of the center frequency) is detected.

  The APD unit 300 includes APD1 to APDn which are APD detectors that measure amplitude probabilities corresponding to the detectors DET1 to DETn, a clock generation unit 310, and a range classification unit 320. The configurations and operations of the APD1 to APDn are the same, and the amplitude probability is measured by logarithmically converting the outputs of the detectors DET1 to DETn with a LOG converter and converting the unit of amplitude to “dB”. Here, a conventional APD can be adopted as an APD that is an APD detector for measuring the amplitude probability. For example, the APD described in Patent Document 2 or the APD described in Japanese Patent Application No. 2006-253889 can be used.

  APD1 to APDn measure amplitude probability (distribution). The amplitude probability represents the number of times (the number of occurrences) that an input signal of the same magnitude is received within a predetermined time range (period: Δt). The fineness for discriminating the magnitude of the input signal is the same as the fineness ΔL of the A / D conversion means 120 in this example. The time range Δt for measuring the probability follows the control from the clock generator 310. The clock generator 310 uses a pulse generator and a timer, for example, as a time range Δt, such as 1 sec interval, 10 sec interval, or 1 min interval (both may be pulses of these time periods). Amplitude probability is measured by generating a signal and causing APD1 to APDn to measure the frequency of the magnitude of the input signal received within those time ranges. A configuration in which the time range Δt can be changed by changing the count time of the timer through the control unit 800 in accordance with an instruction from the operation unit 700 may be adopted.

  The range classification means 320 classifies into a certain range according to the value of the amplitude probability obtained by calculating each of APD1 to APDn. This is a function provided in order to classify into a range suitable for the survey with a resolution according to the survey purpose, although the survey may be performed with a resolution of 1%, for example. In this embodiment, according to an instruction from the operation unit 700, the amplitude probability is classified into four levels, 0 to 1%, 1% to 10%, 10% to 50%, and 50% to 100%. As a method of classification, for example, the value of the amplitude probability obtained by APD1 to APDn is compared with a plurality of threshold values corresponding to the classified range, and a probability classification identification tag in the range to which the comparison result belongs is attached. The classification range may be changed by changing to a desired threshold value through the control unit 800 in accordance with an instruction from the operation unit 700. In addition, from APD1 to APDn, updated amplitude probability values are aggregated and output for each time range Δt if it is fast. Further, the range classification means 320 classifies each amplitude detected by the level detection unit 200 into 20 dB intervals if the entire range of the level measurement range is, for example, 0 dBm to -100 dBm. Is attached.

  The storage unit 400 stores the amplitude values output from the APD1 to APDn and their amplitude probability values as measurement result data (APD measurement results) for all the measurement channels (measurement frequencies) over time. The time passage is stored at least for each time range Δt when the amplitude probability is measured. Further, the storage unit 400 corresponds to the amplitude classification value corresponding to the probability classification identification tag when the range classification means 320 classifies, corresponds to the amplitude value corresponding to the amplitude classification tag, and corresponds to the measured frequency. And remember. In addition, the aging information obtained from the amplitude value and the amplitude probability value is also received from the clock generator 310 and stored. Note that the above range classification means 320 is not on the input side (APD unit 300 side) of the storage unit 400 but on the output side (display control unit 500 side), and stored amplitude probability value or amplitude value. It is also possible to determine which class the amplitude probability value or amplitude value belongs to, and output the determined classification identification tag with the classification attached. The storage unit 400 is accessed from the display control unit 500 and can read the latest stored contents.

  The display control unit 500 is a means for executing display, and roughly includes the following elements (I) to (IV). That is, (I) the amplitude probability value, the amplitude value, the frequency, and the time information from the storage unit 400 are received at a predetermined timing, and the number of display points (the number of display pixels) of the display unit 600 according to the display mode selected by the operation unit 700 The graph generation unit 510 and the full span control unit 512 that perform data processing (average processing or thinning-out processing described later) and generate a graph to be displayed on the display unit 600 are provided. (II) a designated marker generation unit 520, a peak search unit and peak marker generation unit 550, a zone marker generation unit 560 and an enlargement / reduction control unit 511, which are means for setting a marker on the displayed graph; A numerical control unit 513 is provided. (III) A screen control unit 530 is provided as means for displaying a desired graph or the like along the instruction on the display unit 600 based on an instruction from the operation unit 700. And (IV) a common coordinate information storage unit 580 and a display format storage unit 590 for performing each display. The display control unit 500 includes a program that represents the functions (I) to (IV), a storage unit, and a CPU that executes the program and realizes the functions. Note that the coordinate information stored in the coordinate information storage unit 580 is information necessary for specifying the position of the display screen such as a graph to be displayed, a scale, and each display column, and the display format storage unit 590 stores the coordinate information. The format that is displayed is the layout and graphics of the graphs, markers, scales, display fields, etc. that are displayed, and each main part of the display control unit 500 specifies the display position when trying to display it. Used to display in a format corresponding to the specified position. In the following description of each element, description of the coordinates and format is omitted.

  The graph generator 510 stores the stored frequency, amplitude, amplitude probability, and amplitude based on the latest stored content obtained by accessing the storage unit 400 at a predetermined timing, for example, at intervals of the time range Δt described above. A first graph is displayed on the display unit 600 with coordinates having at least any two of the dimensions as time and other one as a parameter. Then, as data to be watched by the operator, when either a specific value or a specific range in two dimensions or parameters on the displayed graph is specified as a specific value by the specified marker, the operation unit 700 In response to the switching instruction from, the two dimensions or parameters designated by the designated marker are generated by switching to a graph for the dimensions and parameters of the new combination that has been designated when the two dimensions or parameters are fixed to the specific values.

  When generating a two-dimensional graph, the graph generation unit 510 is specified (or specified) by a specified marker or peak marker described later, or as a default among the dimensions of frequency, amplitude, amplitude probability, and time. The specific value in any dimension is set as a fixed value, and the data of the remaining dimension in which the specific value is involved is read from the storage unit 400. Then, the horizontal axis (hereinafter referred to as “X-axis”) and the vertical axis (hereinafter referred to as “Y-axis”) of the desired graph requested from the operation unit 700 for data of two of the remaining dimensions. And a graph using the remaining one-dimensional data as a parameter is generated and displayed on the display unit 600, and is updated and displayed at each predetermined timing. In the case of generating a three-dimensional graph, the remaining dimensions other than the dimension for which the specific value is designated are allocated and generated as three dimensions. In addition, when the display unit 600 selects the display mode when displaying the above-described two-dimensional or three-dimensional graph on the display unit 600, the graph generation unit 510 performs data processing according to the number of display points on the display unit 600. (Average processing, thinning-out processing) is performed, and a graph to be displayed on the display unit 600 is generated. The display mode and data processing will be described in detail later.

  Specific graph examples generated by the graph generation unit 510 will be described in the following (a) to (e), and graph switching will be described in (f) and (g). Note that the processing for each dimension of frequency, amplitude, amplitude probability, and time is the same as that of the above-described two-dimensional or three-dimensional graph generation, and the description of each graph is omitted.

FIG. 2 shows a graph for display divided into a plurality of groups and switching between the graphs. As shown in FIG. 2, the graph group is divided into a spectrum display graph, a spectrogram display graph, a chart display graph, a function display graph, and a 3D display graph.
In addition, each numerical value appearing in the following description is an example for explanation.
(A) Graph of spectrum display The graph of this group is suitable for observing the change of amplitude or amplitude probability with respect to frequency, and includes the following (a-1) APD spectrum and (a-2) level spectrum.
(A-1) APD spectrum: a graph in which time (t) is fixed to a specific value, the X axis is frequency (f), the Y axis is amplitude probability (APD), and the amplitude range (Lv: level) is a parameter ( For display examples, see FIG. FIG. 3 shows data when the measurement time is observed at 79 sec (when the measurement time is fixed), and values of the amplitude range as parameters at that time are −20 dBm ≦ amplitude (level) and −40 dBm ≦ amplitude <−20 dBm. -60 dBm≤amplitude <-40 dBm and -80 dBm≤amplitude <-60 dBm. Five markers (MKR) are provided as multi-markers (“▲” in FIG. 3), and all of them are generated and displayed by the designated marker generation unit 520. In FIG. 3, one of the multi-markers (MKR), that is, MKR5 is displayed as an active marker MKR5 that is a marker that has just been operated from the operation unit 700 at present, and its frequency is just below the left side of the graph. It is displayed. The amplitude (level) and amplitude probability (APD) at each marker are shown in the lower table. The designated marker is set in the range of 10% <APD ≦ 50% of the Y axis.
(A-2) Level spectrum: graph in which time (t) is fixed to a specific value, the X axis is frequency (f), the Y axis is amplitude (Lv), and the amplitude probability range (APD) is a parameter (display example) (See FIG. 4). FIG. 4 shows data when the measurement time is observed at 79 sec as in FIG. 3, and the value of the amplitude probability as a parameter at that time is 50% <APD, 10% <APD ≦ 50%, 1% <APD. ≦ 10%, 0% <APD ≦ 1%, and displayed in different colors. The designated marker is set in the range of −60 dBm ≦ amplitude <−40 dBm on the Y axis.

(B) Graph of spectrogram display The graph of this group is suitable for observing the change of amplitude or amplitude probability with respect to frequency and time, and the following (a-1) APD spectrogram and (a-2) level spectrogram are is there.
(B-1) APD spectrogram: a graph in which the amplitude (Lv; level) is fixed to a specific value, the X axis is frequency (f), the Y axis is time, and the amplitude probability range is a parameter (the display example is shown in FIG. 5). See). FIG. 5 shows data when the amplitude range is observed within a range of −60 dBm ≦ amplitude <−40 dBm (when fixed), and the value of the amplitude probability as a parameter at that time is 50% <APD, 10% < APD ≦ 50%, 1% <APD ≦ 10%, 0% <APD ≦ 1% are displayed in different colors. The designated marker is set at time t = 79 sec on the vertical axis.
(B-2) Level spectrogram: graph in which the amplitude probability range (APD) is fixed to a specific value, the X axis is frequency (f), the Y axis is amplitude (Lv; level), and the amplitude range is a parameter (display example) (See FIG. 6). FIG. 6 shows data when the amplitude probability range is observed at 10% <APD ≦ 50% (when fixed), and the value of the amplitude range as a parameter at that time is −20 dBm ≦ amplitude (level), − 40 dBm ≦ amplitude <−20 dBm, −60 dBm ≦ amplitude <−40 dBm, and −80 dBm ≦ amplitude <−60 dBm. Also in this case, the designated marker is set at time t = 79 sec on the vertical axis.

(C) Chart display graphs This group of graphs is suitable for observing the time course of amplitude or amplitude probability for each frequency. The following (c-1) APD chart and (c-2) level chart There is.
(C-1) APD chart: Amplitude range (Lv; level) is fixed to a specific value, X axis is time (t) and Y axis is amplitude probability (APD) for each frequency (f) (that is, frequency is a parameter). ) (See FIG. 7 for a display example). In FIG. 7, the values of the amplitude range are displayed in different colors by −20 dBm ≦ amplitude (level), −40 dBm ≦ amplitude <−20 dBm, −60 dBm ≦ amplitude <−40 dBm, and −80 dBm ≦ amplitude <−60 dBm. The designated marker is set at time t = 79 sec on the vertical axis.
(C-2) Level chart: The amplitude probability range (APD) is fixed to a specific value, the X axis is time (t) and the Y axis is amplitude (Lv) for each frequency (f) (that is, the frequency is a parameter). (See FIG. 8 for a display example). FIG. 8 shows the values of the amplitude probability range in 50% <APD, 10% <APD ≦ 50%, 1% <APD ≦ 10%, and 0% <APD ≦ 1%. The designated marker is set at time t = 79 sec on the vertical axis.

(D) Function Scale Graph This graph is suitable for observing the relationship between amplitude and probability directly. In general, linear coordinates or one of them is often displayed on a logarithmic scale, but when measuring the noise amplitude probability, there is a graph represented by a Rayleigh function scale as a way of looking at the phenomenon of noise generation. If the signal to be measured is noise, it is convenient to have a function scale such as a Rayleigh distribution, a normal distribution, an exponential distribution, or a χ2 distribution. Regarding the function scale, there is a technique described in Japanese Patent No. 3374154, which is a technique related to the present applicant.

  Here, explanation is made assuming that a logarithmic scale and a Rayleigh function scale are prepared. That is, a graph in which time is fixed to a specific value, the X axis is amplitude (Lv), the Y axis is amplitude probability (APD), and the frequency (f) is a parameter, and at least one is a logarithmic function, A graph having at least one of the Rayleigh functions is generated (see the Rayleigh scale graph of FIG. 9 and the logarithmic scale graph of FIG. 10 for display examples). FIG. 9 shows an example in which the horizontal axis represents the Rayleigh scale amplitude probability at time t = 79 sec, and the vertical axis represents the amplitude linearly in dB. The designated marker is in the range of amplitude probability−60 dBm ≦ amplitude <−40 dBm. In position. FIG. 10 is an example in which time is t = 79 sec, the horizontal axis is linear (dB) logarithm, and the vertical axis is logarithmic scale, and the amplitude probability is expressed in logarithmic scale. It is in a position within the range.

(E) 3D graphs This group of graphs is suitable for observing the overall trend in as many dimensions as possible, with the following (e-1) 3D-APD and (e-2) 3D-amplitude.
(E-1) 3D-APD graph: The amplitude range (Lv; level) is fixed to a specific value, and among the three axes, the X axis is time (t), the Y axis is frequency, and the axis in the depth direction (hereinafter, “ A graph in which the amplitude probability (APD) is referred to as “Z-axis” (see FIG. 11 for a display example). FIG. 11 shows data when the amplitude range is observed at −60 dBm ≦ amplitude <−40 dBm (when fixed), and the designated marker is set at time t = 79 sec on the vertical axis.
(E-2) 3D-level graph: The amplitude probability range (APD) is fixed to a specific value, and among the three axes, the X axis is time (t), the Y axis is frequency (f), and the Z axis is amplitude (Lv). ; Level) (see FIG. 12 for a display example). FIG. 12 shows data when the amplitude probability range is observed at 10% <APD ≦ 50% (when fixed), and the designated marker is set at time t = 79 sec on the vertical axis.

  The following can be said when the above (a) and (b) are summarized. In other words, the graph generation unit 510 uses the other one as a parameter in the coordinate with at least any two of the frequency, the amplitude, the amplitude probability, and the time as the previous graph on the display unit 600. When the graph (first graph) is displayed, the specified marker generation unit 520 uses a specific value or a specific range in the two dimensions or parameters on the first graph as a specific value. In some cases, a second graph for a new combination of dimensions and parameters is generated and displayed when the two dimensions or parameter specific values designated by the designated marker from the operation unit 700 are fixed. As the second graph of the switching destination at that time, the frequency, amplitude, amplitude probability, and time, except for one designated as a specified value or parameter, a dimension is any two of the three. A new graph with the remaining one as a parameter on the coordinates is generated.

(F) Switching of graphs between groups FIG. 2 is a diagram illustrating switching between graphs. In switching, a specific value of a desired switching destination graph is specified with a specified marker on the switching source graph, and switching is performed by designating the corresponding graph.

  In other words, the graph displayed on the display unit 600 is switched by the screen control unit 530 instructing the graph generation unit 510 according to a graph request instruction from the operation unit 700. At that time, the screen control unit 530 operates in a state where a specific value (or a specific range) in two dimensions or parameters is specified as a specific value by a specified marker on the graph displayed on the display unit 600. When receiving the switching instruction from the unit 700, the graph generation unit 510 displays a graph regarding the dimensions and parameters of a new desired combination when the two dimensions or parameters designated with the specific values are fixed to the specific values. Generate. An example is described next. Note that a desired graph to be displayed is performed by selecting and instructing the graph names (a) to (e) on the operation unit 700. Hereinafter, individual switching will be described with reference to FIGS. 2 and 3 to 12.

(F-1) Switching from spectrogram display to spectrum display First, the graph of FIG. 5 (or FIG. 6) is displayed, and the designated marker designates time t = 79 sec on the time axis as a specific value. When switched to FIG. 4), the graph generation unit 510 sets the frequency (f) on the X axis and the amplitude probability (or amplitude) on the Y axis and fixes time t = 79 sec as described in (a) above. Then, the amplitude and amplitude range (or amplitude probability and amplitude probability range) at time t = 79 sec are read from the storage unit 400, and a graph using the read amplitude and amplitude range (or amplitude probability and amplitude probability range) as parameters is obtained. Generate.

(F-2) Switching from spectrum display to spectrogram display First, the graph of FIG. 3 (or FIG. 4) is displayed, and the designated marker is amplitude probability range 10% <APD ≦ 50% (or amplitude range−60 dBm ≦ amplitude). <−40 dBm) is specified, and when switched to FIG. 5 (or FIG. 6), the graph generation unit 510 sets the X axis to the frequency (f), Y, as described in (a) above. The axis is time, and the amplitude range in the amplitude probability range 10% <APD ≦ 50% (or the amplitude probability range in amplitude−60 dBm ≦ amplitude <−40 dBm) is read from the storage unit 400, and the read amplitude range (or amplitude probability range) ) As a parameter. At this time, in FIG. 5 (FIG. 6), a designation marker is attached at a position corresponding to the specific value t = 79 sec in FIG. 3 (or FIG. 4).

(F-3) Switching between chart display and spectrum display For example, it is possible to switch from the graph of FIG. 7 (or FIG. 8) to the graph of FIG. 3 (or FIG. 4) by specifying a specific value t = 79 sec. In FIG. 3 (or FIG. 4), the frequency can be specified as a specific value to switch the graph to FIG. 7 (or FIG. 8).

(F-4) Switching between chart display and spectrogram display Similarly, for example, switching between the graph of FIG. 5 (or FIG. 6) and the graph of FIG. Switching is possible by changing the two-dimensional and parameters of each graph while keeping the same amplitude range in the range of 10% <APD ≦ 50% (or amplitude probability range in the range of −60 dBm ≦ amplitude <−40 dBm). is there.

(F-5) Switching between function scale display and spectrum display For example, switching between the graph of FIG. 9 and the graph of FIG. 3 (or FIG. 4) is performed by keeping the specific value the same, for example, at time t = 79 sec. It is possible to switch by changing the two dimensions and parameters of each graph.

(F-6) Switching between function scale display and spectrogram display or chart display The specific value in the graph of FIG. 9, for example, the amplitude range in the amplitude probability range 10% <APD ≦ 50% (or −60 dBm ≦ amplitude <−40 dBm) Amplitude probability range) is designated, and the graph is switched to the graph of FIG. 5 (FIG. 6) or FIG. 7 (FIG. 8). Conversely, it is possible to set the time t = 79 sec as a specific value in the graph of FIG. 5 (FIG. 6) or FIG. 7 (FIG. 8) and switch to the graph of FIG. 9.

(F-7) Switching between 3D graphs (FIGS. 11 and 12) and other graphs FIG. 11 and FIG. 12 show that the specific value by the designated marker is time t = 79 sec in the Z axis (depth direction), Switching from this state to FIG. 3 (FIG. 4) is possible. By specifying a specific value of X axis = frequency or Y axis = amplitude probability (amplitude) with a designated marker, switching to FIGS. 5 to 10 is possible. These reverse switching is also possible.

  By switching the graph as described above, the operator can observe the graph developed around each gazing point. The same observation can be made by changing the point of gaze.

(G) Switching of graphs within a group Switching within the same group in the graphs within the spectrum display group (FIGS. 3 and 4) and the graphs within the spectrogram display group (FIGS. 5 and 6) of FIG. 530 is an instruction from the operation unit 700, and can be achieved by switching the parameter to either the amplitude range or the amplitude probability range. Switching within the same group in the graph within the chart display group (FIGS. 7 and 8) and the graph within the 3D display group (FIGS. 11 and 12) is achieved by switching the Y axis to either amplitude or amplitude probability. it can. Switching between graphs in a function display group can be achieved by switching the function type.

  The designation marker generation unit 520 can designate each dimension constituting the coordinates of each graph by an instruction from the operation unit 700 on the graph displayed as described above (see, for example, FIG. 5). The specific value is fixed to a fixed value in the next switching destination graph, and a graph developed around the fixed value can be obtained.

  The designation marker generation unit 520 can also designate a parameter (or its scale) as well as designation of each dimension constituting the coordinates of each graph by an instruction from the operation unit 700. Then, the specific value is fixed to the next fixed graph fixed value, and a graph developed around the fixed value can be obtained. For example, it is specified by placing a sub marker (as one type of specified marker) at the “amplitude probability range identification display” position, which is the parameter scale in FIG. 5, and the amplitude probability range specified by this sub marker is set as a specific value. You can also expand the following graph. Although the sub marker is set at the parameter scale in FIG. 5, it may be set at a position that directly points to the parameter in the graph (in the coordinates).

  The designated marker generation unit 520 can generate and display a single marker (MKR) or a plurality of multimarkers (MKR) in addition to the designated marker. FIG. 5 shows an example in which five markers are set on the X axis (frequency axis). In the case of FIG. 5, the numerical control unit 513 reads the frequency, amplitude (level), and amplitude probability (APD) at the multimarker point and at the specific value t = 79 sec from the storage unit 400, and in the lower part of FIG. 5. Display. That is, the single or multi-marker is for reading the data at the marker point numerically, and at the same time, can read and display data values other than the values displayed in the graph. An example of a single marker is shown in FIG.

When a predetermined graph is displayed, the peak search unit 540 receives a specification of a range for searching for a peak from the operation unit 700 via the screen control unit 530 and obtains a peak position in the range. And the peak marker production | generation part 550 produces | generates the marker which shows a peak position on the displayed graph, and displays it on the display part 600. FIG. For example, when there is a peak marker display request in a range of 10% <APD ≦ 50% on a level chart (amplitude is Y axis, time is horizontal axis) as shown in FIG. 540 accesses the storage unit 400 and searches for the X-axis and Y-axis positions where the amplitude (level) at each frequency peaks within a range of 10% <APD ≦ 50%, and at the same time, the amplitude and Read the amplitude probability. Then, the peak marker generation unit 550 generates and displays a marker indicating the peak position at the peak position, and the numerical control unit 513 displays the amplitude and the amplitude probability at the peak position (see white display in FIG. 13). .
Since the peak marker indicates the maximum value of the parameter, the specific value of the parameter specified by the peak marker is specified as the specific value using the value specified by the peak marker instead of the specified marker, It is also possible to switch graphs as in (f) above.

  For example, when the graph of the level chart shown in FIG. 14A displays the change in amplitude from 5 minutes before the right end is the current time position (current time position), the full span control unit 512 performs measurement. When the request to observe the level change from the start is made, the full span control unit 512 that has received the request via the screen control unit 530 sends the request to the graph generation unit 510 from the measurement start time (time 0). For example, a graph shown in FIG. 14B is generated and displayed on the display unit 600 as a level chart showing level changes up to the current time (full span). The full span control has been described with the graph of the level chart, but it can be executed with the other graphs.

  The zone marker generation unit 560 generates and displays a marker indicating the zone at the position and width indicated by the operation unit 700 on the displayed graph. See the zone marker in FIG. When the zone is displayed on the graph, the enlargement / reduction control unit 511 that receives an enlargement instruction from the operation unit 700 via the screen control unit 530 enlarges the specified range of the graph (enlarges the image). The generated graph is generated by the graph generation unit 510 and enlarged and displayed on the display unit 600. Refer to FIG. 14C, when the enlargement / reduction control unit 511 receives the reduction instruction next time, the graph generation unit 510 receives a graph obtained by reducing the specified range of the graph (image reduction). It is generated and displayed enlarged on the display unit 600 as shown in FIG. The zone marker and the enlargement / reduction control have been described with the graph of the level chart, but can be executed with other types of graphs.

  The screen control unit 530 controls each unit in the display control unit 500 in response to an instruction from the operation unit 700 as already described when describing each unit.

  The display control unit 500 includes a program that describes the functions and operations described above and a CPU that executes the program. 1 does not necessarily have to be as shown in FIG. 1, and moreover, when executing the above functions / operations or when designing them. Reasonably reclassified and changed. The present invention is within the scope of the present invention as long as it is configured to execute the above functions and operations.

  In the APD measuring apparatus of this example, when any one of spectrum display, spectrogram display, chart display, function scale display, and 3D display shown in FIG. 2 is selected and displayed, it is displayed on the display screen of the display unit 600. When one display mode is selected by depressing the soft key (operation unit 700), a graph allocated on the graph display screen by limiting the measurement result data of all measurement channels to the number of display points (number of display pixels) Has a function to generate and display. Hereinafter, the processing content for each display mode shown in (1) to (8) will be described.

(1) Band average display mode When “band average display mode” is selected as the display mode by operating the operation unit 700, the number N _meas of all measurement channels (measurement frequencies) is divided by the number N _disp of display points (frequency axes). The average value of the APD measurement values of the measurement channels (measurement frequencies) corresponding to the number D = N _meas / N _disp is averaged, and a graph in which the APD average value obtained by the average processing is assigned to each display point of the display unit 600 is generated. To do.

The APD average value APD _k [i] of each threshold level L [i] at the display point CH _disp [k] is calculated by the following equation (1).

For example, the total number of measurement channels: N _meas = 4096, measurement channels CH _meas [n]: CH _meas [1] to CH _meas [4096], the number of display points: N _disp = 1024, the display points CH _disp [k] _{: CH disp [1] ~CH disp} [1024], D = 4, the number of threshold levels: if 1024 is inputted in advance by operating the operation unit 700, as shown in table 1, 4-channel (D = 4) Averaging data is averaged, and an APD average value for one display point on the display unit 600 is calculated. Table 1 below shows average processing results of the measurement channels CH _disp [1] to CH _disp [4].

  Next, a display processing method when displaying the graph obtained by the above-described averaging process on the display unit 600 will be described with a specific example.

As described above, the “band average display mode” is selected as the display mode by the operation of the operation unit 700, and the APD measurement values of the measurement channels (measurement frequencies) for the average number of measurement channels D set by the operation unit 700 are averaged. Then, a graph in which the APD average value obtained by the averaging process is assigned to each display point of the display unit 600 is generated and displayed. That is, using the display point n _disp = D × (N _disp / N _meas ), one data (APD average value for D channels) is displayed on the display unit 600. In this “band average display mode”, as described below, the processing contents differ depending on the relationship between N _meas and N _disp .

When N _meas > N _disp FIG. 15 shows an APD spectrum display (horizontal axis: frequency, vertical axis: level, parameter: APD), the total number of measurement channels: N _meas = 4096, measurement channels CH _meas [n]: CH _meas [1] to CH _meas [4096], number of display points: N _disp = 1024, display point CH _disp [k] = CH _disp [1] to CH _disp [1024], average number of measurement channels: D = 4 (D ≧ An example of display processing when N _meas > N _disp ) is used. In this case, one data (an average value for 4 channels) is displayed on one display point of the display unit 600. In the example of FIG. 15, one data of an average value for 4 channels of the measurement channels CH _meas [1] to CH _meas [4] is displayed on the display point CH _disp [1] of the display unit 600. Similarly, on the display point CH _disp [2] of the display unit 600, 1 data of the average value for 4ch of the next measurement channels CH _meas [5] to CH _meas [8] is displayed.

When N _meas ≦ N _disp FIG. 16 shows an APD spectrum display (horizontal axis: frequency, vertical axis: level, parameter: APD), the number of all measurement channels: N _meas = 256, measurement channels CH _meas [n]: CH _meas [1] to CH _meas [256], number of display points: N _disp = 1024, display point CH _disp [k] = CH _disp [1] to CH _disp [1024], average number of measurement channels: D = 4 An example of display processing in the case of having been performed is shown. In this case, one data (average value for 4 channels) is displayed on 16 display points of the display unit 600. In the example shown in FIG. 15, on the display point _{CH disp [1] ~CH disp [} 16] of the display unit 600, displays the first data of the average value of 4ch amount measurement channel _{CH meas [1] ~CH meas [} 4] To do. Similarly, on the display point CH _disp [17] of the display unit 600 ~CH _disp [32], for displaying one data of the average value of 4ch fraction of the next measurement channel _{CH meas [5] ~CH meas [} 8] .

  In the example of FIGS. 15 and 16, the range of the APD that is a parameter is 0 <APD ≦ 1%, 1% <APD ≦ 10%, 10% <APD ≦ 50%, and 50% <APD.

  In the above description, the number of display channels divided by the number of display points is an integer, or the number of display points divided by the number of all measurement channels is an integer. If a remainder occurs without satisfying the above, the APD measurement results are averaged so that the remainder is eliminated, and the APD measurement results for all the measurement channels are displayed on the graph according to the number of display points. To do.

  Furthermore, although an example in which the APD measurement result is averaged in the frequency axis direction and the APD data on each display point is calculated and displayed on the graph has been described, the APD measurement result is averaged in the time axis direction, APD data can be calculated on each display point and displayed on the graph.

(2) Fixed point selection display mode (frequency axis data)
Number of all measurement channels (measurement frequencies) N _meas divided by the number of display points (frequency axis) N _disp D = N _meas / N Select the APD measurement result of each measurement channel (measurement frequency) for each _disp and select this The APD measurement result is displayed on each display point of the display unit 600. That is, the measurement result CH _meas [n] of the measurement channel at the fixed point D interval is displayed on each display point CH _disp [k] of the display unit 600. CH _disp [k] = CH _meas [(k−1) D + 1]

For example, the total number of measurement channels: N _meas = 4096, measurement channels CH _meas [n]: CH _meas [1] to CH _meas [4096], the number of display points: N _disp = 1024, the display points CH _disp [k] _{: CH disp [1] ~CH disp} [1024], when D = 4 are input in advance by the operation of the operation unit 700, as shown in table 2, the data for each 4-channel (D = 4) Is displayed on each display point of the display unit 600.

(Time axis data)
In each measurement channel (measurement frequency), and select the APD measurement result of the total measurement time T _meas a display point (time axis) number T _disp number divided by D = T _meas / T measurement time per _disp, and this selection The APD measurement result is displayed on each display point of the display unit 600. That is, the measurement result APD_T _meas [t] of the measurement time of the fixed point D interval in each measurement channel is displayed on each display point APD_T _disp [k] of the display unit 600. APD_T _disp [k] = APD_T _meas [(k−1) D + 1]

For example, the total measurement time (measurement cycle: 1 second) in each measurement channel: T _meas = 4096, the measurement results APD_T _meas [t]: APD_T _meas [1] to APD_T in each measurement time (measurement cycle: 1 second) _meas [4096], number of display points: T _disp = 1024, display point APD_T _disp [k]: APD_T _disp [1] to APD_T _disp [1024], D = 4 is input in advance by operation of the operation unit 700 As shown in Table 3 below, data for each measurement time of 4 seconds (D = 4) is displayed on each display point of the display unit 600.

(3) Specified APD value point selection display mode (frequency axis data)
Total number of measurement channels (measurement frequency) N _meas divided by display point (frequency axis) number N _disp D = N _meas / N _disp APD measurement result of measurement channel (measurement frequency) of specified APD The APD measurement result of the measurement channel whose threshold level is “maximum” or “minimum” is selected, and the selected APD measurement result is displayed on each display point of the display unit 600.

For example, the total number of measurement channels: N _meas = 4096, measurement channels CH _meas [n]: CH _meas [1] to CH _meas [4096], the number of display points: N _disp = 1024, the display points CH _disp [k] _{: CH disp [1] ~CH disp} [1024], D = 4, designated APD value: if the APD> 0.01 are input in advance by the operation of the operation unit 700, as shown in table 4, From the four channels (D = 4), the APD measurement data of the measurement channel that maximizes the threshold level corresponding to the designated APD value is selected, and the selected APD measurement data is displayed on each display point of the display unit 600. To do.

(Time axis data)
In each measurement channel (measurement frequency), the specified APD is selected from the APD measurement results of the measurement time of D = T _meas / T _disp by dividing the total measurement time T _meas by the number of display points (time axis) T _disp The APD measurement result of the measurement time when the threshold level as the value is “maximum” or “minimum” is selected, and the selected APD measurement result is displayed on each display point of the display unit 600.

For example, the total measurement time (measurement cycle: 1 second) in each measurement channel: T _meas = 4096, the measurement results APD_T _meas [t]: APD_T _meas [1] to APD_T in each measurement time (measurement cycle: 1 second) _meas [4096], number of display points: T _disp = 1024, display point APD_T _disp [k]: APD_T _disp [1] to APD_T _disp [1024], D = 4, designated APD value: APD> 0.01 In the case where it is input in advance by the operation of 700, as shown in Table 5 below, the threshold value level corresponding to the designated APD value is maximized from the data for the measurement time of 4 seconds (D = 4). The time APD measurement data is selected, and the selected APD measurement data is displayed on each display point of the display unit 600.

(4) Command level value point selection display mode (frequency axis data)
Number of all measurement channels (measurement frequencies) N _meas divided by the number of display points (frequency axis) N _disp D = N _meas / N _disp A threshold value specified from the APD measurement results of measurement channels (measurement frequencies) for _disp The APD measurement result of the measurement channel whose APD value at the level is “maximum” or “minimum” is selected, and the selected APD measurement result is displayed on each display point of the display unit 600.

For example, the total number of measurement channels: N _meas = 4096, measurement channels CH _meas [n]: CH _meas [1] to CH _meas [4096], the number of display points: N _disp = 1024, the display points CH _disp [k] _{: CH disp [1] ~CH disp} [1024], D = 4, specified threshold level: if over 40dBm is inputted in advance by operating the operation unit 700, as shown in table 6, 4 channels ( The APD measurement data of the measurement channel that maximizes the APD value at the designated threshold level is selected from D = 4), and the selected APD measurement data is displayed on each display point of the display unit 600.

(Time axis data)
In each measurement channel (measurement frequency), the specified threshold value is selected from the APD measurement results of the measurement time corresponding to the total measurement time T _meas divided by the number of display points (time axis) T _disp D = T _meas / T _disp The APD measurement result of the measurement time at which the APD value at the level is “maximum” or “minimum” is selected, and the selected APD measurement result is displayed on each display point of the display unit 600.

For example, the total measurement time (measurement cycle: 1 second) in each measurement channel: T _meas = 4096, the measurement results APD_T _meas [t]: APD_T _meas [1] to APD_T in each measurement time (measurement cycle: 1 second) _meas [4096], number of display points: T _disp = 1024, display point APD_T _disp [k]: APD_T _disp [1] to APD_T _disp [1024], D = 4, specified threshold level: −40 dBm is the operation of the operation unit 700 As shown in Table 7 below, the APD measurement of the measurement time at which the APD value at the specified threshold level is maximum is selected from the data for the measurement time of 4 seconds (D = 4), as shown in Table 7 below. Data is selected, and the selected APD measurement data is displayed on each display point of the display unit 600.

(5) Peak value point selection display mode (frequency axis data)
Number of all measurement channels (measurement frequency) N _meas divided by display point (frequency axis) number N _disp D = N _meas / N _{disp A} peak measurement level from the APD measurement results of measurement channels (measurement frequency) The APD measurement result of the measurement channel that becomes “maximum” or “minimum” is selected, and the selected APD measurement result is displayed on each display point of the display unit 600.

For example, the total number of measurement channels: N _meas = 4096, measurement channels CH _meas [n]: CH _meas [1] to CH _meas [4096], the number of display points: N _disp = 1024, the display points CH _disp [k] _{: CH disp [1] ~CH disp} [1024], when D = 4 are input in advance by the operation of the operation unit 700, as shown in table 8, among the 4-channel (D = 4) The APD measurement data of the measurement channel with the maximum peak value level is selected, and the selected APD measurement data is displayed on each display point of the display unit 600.

(Time axis data)
For each measurement channel (measurement frequency), the peak value level from the APD measurement result of the measurement time corresponding to the total measurement time T _meas divided by the number of display points (time axis) T _disp D = T _meas / T _disp The APD measurement result of the measurement time when becomes “maximum” or “minimum” is selected, and the selected APD measurement result is displayed on each display point of the display unit 600.

For example, the total measurement time (measurement cycle: 1 second) in each measurement channel: T _meas = 4096, the measurement results APD_T _meas [t]: APD_T _meas [1] to APD_T in each measurement time (measurement cycle: 1 second) _meas [4096], number of display points: T _disp = 1024, display point APD_T _disp [k]: APD_T _disp [1] to APD_T _disp [1024], D = 4 is input in advance by operation of the operation unit 700 As shown in Table 9 below, APD measurement data of the measurement time at which the peak value level is maximum is selected from the data for the measurement time of 4 seconds (D = 4), and the selected APD measurement data is selected. Is displayed on each display point of the display unit 600.

(6) Instantaneous power average value point selection display mode (frequency axis data)
Total number of measurement channels (measurement frequency) N _meas divided by the number of display points (frequency axis) N _disp D = N _meas / N _disp APD measurement value from the APD measurement results of measurement channels (measurement frequency) The APD measurement result of the measurement channel having the instantaneous power average value calculated from “Max” or “Minimum” is selected, and the selected APD measurement result is displayed on each display point of the display unit 600.
The average instantaneous power value of each measurement channel is calculated from the threshold level x _i [mW] and the APD value APD (x _i ) of each threshold level (number of levels X) by the following equation (2).

For example, the total number of measurement channels: N _meas = 4096, measurement channels CH _meas [n]: CH _meas [1] to CH _meas [4096], the number of display points: N _disp = 1024, the display points CH _disp [k] _{: CH disp [1] ~CH disp} [1024], D = 4, the number of threshold levels: if X = 1024 is inputted in advance by operating the operation unit 700, as shown in table 10 below, 4-channel The APD measurement data of the measurement channel with the maximum instantaneous power average value is selected from (D = 4), and the selected APD measurement data is displayed on each display point of the display unit 600.

(Time axis data)
For each measurement channel (measurement frequency), the APD measurement value is obtained from the APD measurement result of the measurement time of D = T _meas / T _disp by dividing the total measurement time T _meas by the number of display points (time axis) T _disp The APD measurement result of the measurement time when the instantaneous power average value calculated from the above is “maximum” or “minimum” is selected, and the selected APD measurement result is displayed on each display point of the display unit 600.

For example, the total measurement time (measurement cycle: 1 second) in each measurement channel: T _meas = 4096, the measurement results APD_T _meas [t]: APD_T _meas [1] to APD_T in each measurement time (measurement cycle: 1 second) _meas [4096], number of display points: T _disp = 1024, display point APD_T _disp [k]: APD_T _disp [1] to APD_T _disp [1024], D = 4, number of threshold levels: X = 1024 If input in advance by operation, as shown in Table 11 below, the APD measurement data of the measurement time at which the instantaneous voltage average value is maximum is selected from the data for the measurement time of 4 seconds (D = 4). The selected APD measurement data is displayed on each display point of the display unit 600.

(7) Instantaneous voltage average point selection display mode (frequency axis data)
Total number of measurement channels (measurement frequency) N _meas divided by the number of display points (frequency axis) N _disp D = N _meas / N _disp APD measurement value from the APD measurement results of measurement channels (measurement frequency) The APD measurement result of the measurement channel having the instantaneous voltage average value calculated from “maximum” or “minimum” is selected, and the selected APD measurement result is displayed on each display point of the display unit 600.
Note that the instantaneous voltage average value of each measurement channel is calculated from the threshold level x _i [μV] and the APD value APD (x _i ) of each threshold level (number of levels X) by the following equation (3).

For example, the total number of measurement channels: N _meas = 4096, measurement channels CH _meas [n]: CH _meas [1] to CH _meas [4096], the number of display points: N _disp = 1024, the display points CH _disp [k] _{: CH disp [1] ~CH disp} [1024], D = 4, the number of threshold levels: if X = 1024 is inputted in advance by operating the operation unit 700, as shown in table 12 below, 4-channel The APD measurement data of the measurement channel having the maximum instantaneous voltage average value is selected from (D = 4), and the selected APD measurement data is displayed on each display point of the display unit 600.

(Time axis data)
For each measurement channel (measurement frequency), the APD measurement value is obtained from the APD measurement result of the measurement time of D = T _meas / T _disp by dividing the total measurement time T _meas by the number of display points (time axis) T _disp The APD measurement result of the measurement time at which the instantaneous voltage average value calculated from the above is “maximum” or “minimum” is selected, and the selected APD measurement result is displayed on each display point of the display unit 600.

For example, the total measurement time (measurement cycle: 1 second) in each measurement channel: T _meas = 4096, the measurement results APD_T _meas [t]: APD_T _meas [1] to APD_T in each measurement time (measurement cycle: 1 second) _meas [4096], number of display points: T _disp = 1024, display point APD_T _disp [k]: APD_T _disp [1] to APD_T _disp [1024], D = 4, number of threshold levels: X = 1024 If input in advance by operation, as shown in Table 13 below, the APD measurement data of the measurement time at which the instantaneous voltage average value is maximum is selected from the data for the measurement time of 4 seconds (D = 4). The selected APD measurement data is displayed on each display point of the display unit 600.

(8) Peak-to-average power ratio (PAPR) point selection display mode (frequency axis data)
Total number of measurement channels (measurement frequency) N _meas divided by the number of display points (frequency axis) N _disp D = N _meas / N _disp APD measurement value from the APD measurement results of measurement channels (measurement frequency) The APD measurement result of the measurement channel having the peak-to-average power ratio (PAPR) calculated from “maximum” or “minimum” is selected, and the selected APD measurement result is displayed on each display point of the display unit 600.
The peak-to-average power ratio (PAPR) of each measurement channel is calculated by PAPR [dB] = peak power [dBm] −instantaneous power average value [dBm].

For example, the total number of measurement channels: N _meas = 4096, measurement channels CH _meas [n]: CH _meas [1] to CH _meas [4096], the number of display points: N _disp = 1024, the display points CH _disp [k] _{: CH disp [1] ~CH disp} [1024], when D = 4 are input in advance by the operation of the operation unit 700, as shown in the following table 14, among the 4-channel (D = 4) The APD measurement data of the measurement channel that maximizes the peak-to-average power ratio (PAPR) is selected, and the selected APD measurement data is displayed on each display point of the display unit 600.

(Time axis data)
For each measurement channel (measurement frequency), the APD measurement value is obtained from the APD measurement result of the measurement time of D = T _meas / T _disp by dividing the total measurement time T _meas by the number of display points (time axis) T _disp The APD measurement result of the measurement time when the peak-to-average power ratio (PAPR) calculated from the above is “maximum” or “minimum” is selected, and the selected APD measurement result is displayed on each display point of the display unit 600.

For example, the total measurement time (measurement cycle: 1 second) in each measurement channel: T _meas = 4096, the measurement results APD_T _meas [t]: APD_T _meas [1] to APD_T in each measurement time (measurement cycle: 1 second) _meas [4096], number of display points: T _disp = 1024, display point APD_T _disp [k]: APD_T _disp [1] to APD_T _disp [1024], D = 4 is input in advance by operation of the operation unit 700 As shown in Table 15 below, APD measurement data of the measurement time at which the peak-to-average power ratio (PAPR) is maximized is selected from the data for the measurement time of 4 seconds (D = 4). The selected APD measurement data is displayed on each display point of the display unit 600.

  Here, the thinning processing method when any one of the display modes (2) to (8) described above is selected will be described in more detail with a specific example.

  When any one of the display modes (2) to (8) is selected by the operation of the operation unit 700, the APD measurement result corresponding to the thinning number D set by the operation unit 700 is selected according to the selected display mode. The selected APD measurement result is displayed on each display point of the display unit 600.

Specifically, FIG. 17 shows an APD spectrum display (horizontal axis: frequency, vertical axis: level, parameter: APD), display mode: designated APD value point selection display mode, total number of measurement channels: N _meas = 256, measurement channel _{CH meas [n]: CH meas} [1] ~CH meas [4096], display the number of points: n _disp = 1024, a display point _{CH disp [k] = CH disp} [1] ~CH disp [1024], thinning stars A display example is shown in which D = 4 and designated APD value: APD> 1%. In this case, the APD measurement data of the measurement channel that maximizes the threshold level corresponding to the designated APD value is selected from the four channels (D = 4), and the selected APD measurement data is displayed on each display point of the display unit 600. Display above. In the example of FIG. 17, of the four channels _{CH meas [1] ~CH meas [} 4], the specified APD value: APD> 1% and becomes the threshold level APD measuring measurement channels having the maximum data CH _meas [3 ] Is displayed at the display point CH _disp [1]. Similarly, from the following four channels _{CH meas [5] ~CH meas [} 8], specifies APD value: APD> APD measured data CH _meas measurement channels 1% and becomes the threshold level is maximum [6] Is displayed at the display point CH _disp [2].

18 shows an APD chart display (horizontal axis: time, vertical axis: level, parameter: APD), display mode: designated APD value point selection display mode, total measurement time in each measurement channel (measurement cycle: 1 second). : T _meas = 4096, measurement result APD_T _{meas at} each measurement time (measurement cycle: 1 second): APD_T _meas [1] to APD_T _meas [4096], number of display points: T _disp = 1024, display point APD_T _disp [k] = APD_T _disp [1] to APD_T _disp [1024], thinning number: D = 4, designated APD value: APD> 1%. In this case, the APD measurement data of the measurement time at which the threshold level corresponding to the designated APD value is maximized is selected from the measurement time of 4 seconds (D = 4), and the selected APD measurement data is displayed on each display unit 600. Display on the display point. In the example of FIG. 18, measurement with the maximum threshold level at which the designated APD value: APD> 1% is obtained from the data APD_T _meas [1] to APD_T _meas [4] for the measurement time of 4 seconds (D = 4). The time APD measurement data APD_T _meas [3] is displayed at the display point APD_T _disp [1]. Similarly, from the data APD_T _meas [5] to APD_T _meas [8] for the next measurement time of 4 seconds (D = 4), the measurement time at which the threshold level at which the designated APD value: APD> 1% becomes maximum is obtained. APD measurement data APD_T _meas [6] is displayed at the display point APD_T _disp [2].

  As described above, according to the APD measurement apparatus of this example, the above-described APD measurement result screen display processing function allows the condition items (for example, average value, arbitrary APD value, peak level) to be noticed from all measurement result data. Value, etc.), the total measurement result data can be limited to the number of display points on the graph display screen.

  In addition, since all the acquired measurement result data is stored in the storage unit 400, it is displayed in a limited manner on the graph display, but the location of the location indicated by the designated marker displayed by the designated marker generation unit 520 is displayed. Since the APD measurement result is numerically displayed on the display unit 600, all the APD measurement results at the location indicated by the designated marker can be visually confirmed.

DESCRIPTION OF SYMBOLS 100 Frequency analysis part 110 Band selection means 120 A / D conversion means 130 Frequency selection means 200 Level detection part 300 APD part 310 Clock generation part 320 Range classification means 400 Storage part 500 Display control part 510 Graph generation part 511 Expansion / reduction control part 512 Full Span Control Unit 513 Numerical Control Unit 520 Designated Marker Generation Unit 530 Screen Control Unit 540 Peak Search Unit 550 Peak Marker Generation Unit 560 Zone Marker Generation Unit 580 Coordinate Information Storage Unit 590 Display Format Storage Unit 600 Display Unit 700 Operation Unit 800 Control Unit

Claims (10)

A frequency analysis unit (100) for analyzing the frequency component of the signal under measurement, a level detection unit (200) for detecting the amplitude of each analyzed frequency component, and the amplitude of each detected frequency component per unit time An APD unit (300) for obtaining an amplitude probability for each passage of time, a storage unit (400) for storing the amplitude probability of each frequency component output by the APD unit corresponding to the passage of time, and a display unit (600) And the operation unit (700) and the latest stored contents of the storage unit obtained by accessing the storage unit at a predetermined timing, among the frequency, the amplitude, the amplitude probability, and the time. A display control unit (500) for displaying on the display unit a graph having one or three coordinates as a parameter and the remaining one as a parameter,
The display control unit limits all the APD measurement results of the measurement channel or measurement time to the number of display points of the display unit by averaging or thinning out the APD measurement result for each preset measurement channel number or measurement time. The APD measurement apparatus according to claim 1, wherein the APD measurement apparatus displays the graph on the display unit as a graph. The display control unit (500) assigns to each display point an APD average value obtained by averaging APD measurement results corresponding to the number of measurement channels or measurement times obtained by dividing the total number of measurement channels by the number of display points. 600). The APD measuring apparatus according to claim 1, wherein the APD measuring apparatus is displayed. The display control unit (500) allocates APD measurement results for each measurement channel or measurement time by dividing the total number of measurement channels by the number of display points, and displays the result on the display unit (600). The APD measuring apparatus according to claim 1. The display control unit (500) has a maximum or minimum threshold level for a designated APD value from among APD measurement results corresponding to the number of measurement channels or measurement times obtained by dividing the total number of measurement channels by the number of display points. The APD measurement apparatus according to claim 1, wherein an APD measurement result of a measurement channel or a measurement time is selected, assigned to each display point, and displayed on the display unit (600). The display control unit (500) measures a maximum or minimum APD value at a specified threshold level from among APD measurement results corresponding to the number of measurement channels or measurement times obtained by dividing the total number of measurement channels by the number of display points. The APD measurement apparatus according to claim 1, wherein an APD measurement result of a channel or a measurement time is selected, assigned to each display point, and displayed on the display unit (600). The display control unit (500) has a maximum or minimum peak value level among the APD measurement results corresponding to the number of measurement channels or measurement times obtained by dividing the total number of measurement channels by the number of display points. The APD measurement apparatus according to claim 1, wherein the APD measurement result is selected, assigned to each display point, and displayed on the display unit (600). The display control unit (500) is a measurement channel or measurement in which the average instantaneous power value is maximized or minimized among the APD measurement results corresponding to the number of measurement channels or measurement times obtained by dividing the total number of measurement channels by the number of display points. The APD measuring apparatus according to claim 1, wherein a time APD measurement result is selected, assigned to each display point, and displayed on the display unit (600). The display control unit (500) is a measurement channel or measurement in which the instantaneous voltage average value is maximized or minimized among APD measurement results corresponding to the number of measurement channels or measurement times obtained by dividing the total number of measurement channels by the number of display points. The APD measuring apparatus according to claim 1, wherein a time APD measurement result is selected, assigned to each display point, and displayed on the display unit (600). The display control unit (500) includes a measurement channel having a maximum or minimum peak-to-average power ratio among APD measurement results corresponding to a number of measurement channels or measurement times corresponding to the number of display channels divided by the number of display points The APD measurement apparatus according to claim 1, wherein an APD measurement result of a measurement time is selected, assigned to each display point, and displayed on the display unit (600). A designation marker generation unit (520) that displays a designation marker that designates either a specific value or a specific range in two dimensions or parameters on the graph displayed on the display unit (600) as a specific value. ,
The display control unit (500) numerically displays an APD measurement result at a location indicated by the designated marker displayed by the designated marker generation unit on the display unit. An APD measuring apparatus according to the above.