Phase characteristic measuring instrument, signal generating device and signal analyzing device including the same, and phase characteristic measuring method

Abstract

To provide a phase characteristics measuring instrument and the like that uses a voltmeter and a wave detector not requiring a high-speed trigger operation to avoid increase in the scale of an apparatus used for phase measurement, and thereby can achieve phase measurement at a relatively low price.SOLUTION: A phase characteristics measuring instrument comprises: a first wave detector 11 that receives and detects two patterns of three-tone signals, a first three-tone signal obtained by combining the three waves of angular frequencies ω1,ω2,ω3 (wherein ω2-ω1=ω3-ω2=Δω) and a second three-tone signal obtained by changing the phase of one tone of the first three-tone signal; a BPF 12 that allows only a beat component of an angular frequency difference Δω of adjacent waves of the three-tone signal from the signal output from the first wave detector to pass therethrough; a second wave detector 13 that detects power of the beat component that has passed through the BPF 12; a voltmeter 14 that measures the voltage of the signal output from the second wave detector; and a phase calculator 15 that calculates the phase on the basis of the measured voltage value.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] The present invention relates to a phase characteristic measuring device, a signal generating device and a signal analyzing device including the same, and a phase characteristic measuring method.

Background Art

[0002] In order to improve the transmission speed of wireless communication, a communication method using a broadband modulation signal in a millimeter wave band, a sub-millimeter wave band, or a terahertz wave band having a higher carrier frequency than before has been studied. Hereinafter, the millimeter wave band, the sub-millimeter wave band, the terahertz wave band, etc. are collectively referred to as a high frequency band, and signals in the high frequency band are collectively referred to as high frequency signals.

[0003] Generally, when the frequency is high and the bandwidth is wide, the frequency characteristics of the phase of the frequency conversion unit (upconverter or downconverter) of a high frequency band signal generator or a high frequency band signal measuring device cannot be ignored, so it is important to calibrate the phase characteristics of the frequency conversion unit. In addition, in a multi-value quadrature amplitude modulation method with high frequency utilization efficiency, a small phase error causes deterioration of transmission characteristics, so accurate calibration of phase characteristics is required.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0005] The prior art described in Patent Document 1 inputs two tone signals in a high-frequency band such as millimeter waves into an envelope detector (simply called a detector), measures the beat between the tones with the detector, detects the phase difference between the tones, and measures the frequency characteristics of the phase (simply called the phase characteristics). However, in this method, it is necessary to obtain the initial phase of the beat between the tone signals. To obtain the initial phase, a trigger must be applied to an analog-to-digital converter (ADC) that acquires the time waveform of the detector output signal, and synchronization with the tone signal generator must be achieved. To perform such a high-speed trigger operation, there is a problem that high-cost components are required.

[0006] To solve the above problems, there is a method of acquiring the time waveforms of three tone signals in a high-frequency band such as millimeter waves and calculating the phase characteristics. By using three tone signals, it becomes possible to measure the phase characteristics even when the ADC trigger is absent and the initial phase is unknown. Examples of measurements using three tone signals include the electro-optic sampling method (see, for example, Patent Document 2) and the method of down-converting high-frequency signals such as millimeter waves. In particular, when the electro-optic sampling method is used, the phase characteristics at very high frequencies can be accurately obtained. However, on the other hand, an optical system such as a femtosecond laser is required, and there is a problem that the device becomes large-scale. In the down-conversion method, a local signal in a high-frequency band such as millimeter waves is required, and there is a problem that the device becomes large-scale.

[0007] The present invention has been made to solve the above-described problems, and an object thereof is to provide a phase characteristic measuring device that can avoid the enlargement of the device used for phase measurement and realize phase measurement at a relatively low cost, a signal generation device and a signal analysis device including the same, and a phase characteristic measuring method.

Means for Solving the Problems

[0008] In order to achieve the above object, the phase characteristic measuring device according to the present invention includes a first detector (11) that receives and detects a first three-tone signal obtained by combining three waves e1, e2, and e3 represented by the following formula (1) and a second three-tone signal obtained by combining three waves e′1, e′2, and e′3 represented by the following formula (2), respectively; among the signals output from the first detector, a band-pass filter (12) that passes frequency components of an angular frequency difference Δω between waves adjacent in frequency of each of the first and second three-tone signals and blocks frequency components of twice the angular frequency difference Δω and a DC component; a second detector (13) that detects the signal that has passed through the band-pass filter; a voltmeter (14) that measures the voltage of the signal output from the second detector; and a phase calculator (15) that calculates a phase φ2″ represented by the following formula (3). It is characterized by comprising these components.

Number

Number

Number

[0009] With this configuration, for two patterns of three-tone signals, namely the first three-tone signal represented by the above formula (1) and the second three-tone signal represented by the above formula (2) in which the phase of one of the tones is changed, by measuring the power of the beat component of the angular frequency Δω with the second detector, the phase relationship (second derivative value) of the three tones represented by the above formula (3) can be calculated. As a result, by using a voltmeter or detector that does not require a high-speed trigger operation, it is possible to provide a phase characteristic measuring device that can avoid the enlargement of the device and realize phase measurement at a relatively low cost.

[0010] Further, the phase characteristic measuring device according to the present invention, for achieving the above object, includes a first detector (11) that receives and detects a three-tone signal obtained by combining three waves e1, e2, and e3 represented by the following formula (4), and among the signals output from the first detector, a band-pass filter (12) that passes the frequency component of the angular frequency difference Δω between waves adjacent to the frequencies of the three-tone signal and blocks the frequency component twice the angular frequency difference Δω and the DC component, a second detector (13) that detects the signal that has passed through the band-pass filter, a voltmeter (14) that measures the voltage of the signal output from the second detector, and a phase calculator (15) that calculates a phase φ2″ represented by the following formula (5).

Number

Number

[0011] With this configuration, for the three-tone signals of the three patterns (ψ = 0, π / 2, π) represented by the above formula (4), by measuring the power of the beat component of the angular frequency Δω with the second detector, even when the amplitudes a1, a2, a3 of the three-tone signals are unknown and not equal to each other, the phase relationship (second derivative value) of the three tones represented by the above formula (5) can be calculated. As a result, by using a voltmeter and a detector that do not require a high-speed trigger operation, it is possible to provide a phase characteristic measuring device that can avoid the enlargement of the device and realize phase measurement at a relatively low cost. Also, E beat It is not affected by the offset generated during the measurement of (ψ).

[0012] The phase characteristic measuring device according to the present invention includes, for achieving the above object, a first detector (11) that receives and detects a three-tone signal obtained by combining three waves e1, e2, e3 represented by the following formula (6), and among the signals output from the first detector, a band-pass filter (12) that passes the frequency component of the angular frequency difference Δω between adjacent waves of the three-tone signal and blocks the frequency component twice the angular frequency difference Δω and the DC component, a second detector (13) that detects the signal that has passed through the band-pass filter, a voltmeter (14) that measures the voltage of the signal output from the second detector, and a phase calculator (15) that calculates a phase φ2″ represented by the following formula (7).

Equation

Number

[0013] With this configuration, for the three-tone signals of the three patterns (ψ = 0, π / 2, π) represented by the above formula (6), by measuring the power of the beat component of the angular frequency Δω with the second detector, even when the amplitudes a1, a2, and a3 of the three-tone signals are unknown and not equal to each other, the phase relationship (second derivative value) of the three tones represented by the above formula (11) can be calculated. By using the atan2 function in the above formula (7), compared with the case of using the tan -1 function in the above formula (5), the phase measurement range becomes wider. As a result, by using a voltmeter and a detector that do not require a high-speed trigger operation, it is possible to provide a phase characteristic measuring device that can avoid the enlargement of the device and realize phase measurement at a relatively low cost. Also, E beat (ψ) is not affected by the influence of the offset generated during measurement.)

[0014] The signal generation device according to the present invention includes a high-frequency signal generation unit (2) that generates a high-frequency signal and a three-tone signal, a coupler (3) that branches the signal output from the high-frequency signal generation unit and outputs one of the signals as an output signal, and when the high-frequency signal generation unit generates the three-tone signal, the other signal branched by the coupler is input, and the phase characteristic of the high-frequency signal generation unit is measured by measuring the phase of the input three-tone signal, and the phase characteristic measuring device (1) according to any one of the above, and when the high-frequency signal generation unit generates the high-frequency signal, the phase characteristic of the high-frequency signal is corrected based on the phase characteristic of the high-frequency signal generation unit measured by the phase characteristic measuring device.

[0015] With this configuration, an effect similar to the effect described above for the phase characteristic measuring device can be obtained, and since the phase characteristic of the high-frequency signal generation unit can be corrected based on the phase characteristic of the high-frequency signal generation unit measured by the phase characteristic measuring device, it becomes possible to generate a high-frequency signal with good phase characteristics.

[0016] The signal analysis device according to the present invention includes a reference signal generation unit (20) that generates a reference signal and a three-tone signal, a coupler (3) that branches the signal output from the reference signal generation unit, and when the reference signal generation unit generates the three-tone signal, one signal branched by the coupler is input, and the phase characteristic of the reference signal generation unit is measured by measuring the phase of the input three-tone signal, the phase characteristic measuring device (1) according to any one of the above, a switch (4) that selects either the other signal branched by the coupler or the input signal, and a high-frequency signal analysis unit (5) that analyzes the signal selected by the switch. When the reference signal generation unit generates the reference signal and the other signal branched by the coupler is selected by the switch, the phase characteristic of the reference signal measured by the high-frequency signal analysis unit and the phase characteristic of the reference signal generation unit measured by the phase characteristic measuring device are used to calculate the phase characteristic of the high-frequency signal analysis unit. When the input signal is selected by the switch, based on the calculated phase characteristic of the high-frequency signal analysis unit, the phase characteristic when the high-frequency signal analysis unit analyzes the input signal is corrected, and signal analysis of the input signal with the corrected phase characteristic is performed.

[0017] As described above, the phase characteristic of the reference signal generation unit is measured by the phase characteristic measuring device, and by inputting a signal having a known phase characteristic from the reference signal generation unit to the high-frequency signal analysis unit, the phase characteristic of the high-frequency signal analysis unit is measured. Based on the measured phase characteristic of the high-frequency signal analysis unit, the phase characteristic of the high-frequency signal analysis unit is corrected, and signal analysis of the input signal is performed by the high-frequency signal analysis unit with the corrected phase characteristic. As a result, an effect similar to the effect described above for the phase characteristic measuring device can be obtained, and since signal analysis with the corrected phase characteristic can be performed, it is possible to improve the quality of the analysis.

[0018] The phase characteristic measurement method according to the present invention includes, in order to achieve the above object, a first three-tone signal generation step of generating a first three-tone signal obtained by combining three waves e1, e2, and e3 represented by the following formula (8), a first detection step of detecting the first three-tone signal, a first band-pass filter step of passing a frequency component of an angular frequency difference Δω between waves adjacent to the frequency of the first three-tone signal among the signals obtained by the first detection step and blocking a frequency component twice the angular frequency difference Δω and a DC component, a second detection step of detecting the signal passed through the first band-pass filter step, a first voltage measurement step of measuring the voltage of the signal obtained by the second detection step, a second three-tone signal generation step of generating a second three-tone signal obtained by combining three waves e′1, e′2, and e′3 represented by the following formula (9), a third detection step of detecting the second three-tone signal, a second band-pass filter step of passing a frequency component of an angular frequency difference Δω between waves adjacent to the frequency of the second three-tone signal among the signals obtained by the third detection step and blocking a frequency component twice the angular frequency difference Δω and a DC component, a fourth detection step of detecting the signal passed through the second band-pass filter step, a second voltage measurement step of measuring the voltage of the signal obtained by the fourth detection step, and a phase calculation step of calculating a phase φ2″ represented by the following formula (10) from the voltage value measured in the first voltage measurement step and the voltage value measured in the second voltage measurement step. (However, ω represents the angular frequency, φ represents the phase, t represents time, and ω2 - ω1 = ω3 - ω2 = Δω.)

Number

Number

Number

[0019] With this configuration, for the two - pattern three - tone signals, namely the first three - tone signal represented by the above formula (8) and the second three - tone signal represented by the above formula (9) in which the phase of one of the tones is changed, by measuring the power of the beat component of the angular frequency Δω, the three - tone phase relationship (second - order differential value) represented by the above formula (10) can be calculated. As a result, by using a voltmeter or a detector that does not require a high - speed trigger operation, a phase - characteristic measurement method capable of realizing phase measurement at a relatively low cost without using a large - scale device can be provided.

[0020] The phase - characteristic measurement method according to the present invention, for achieving the above object, includes a three - tone signal generation step of generating a three - tone signal obtained by combining three waves e1, e2, e3 represented by the following formula (11), a first detection step of detecting the three - tone signal, a band - pass filter step of passing the frequency component of the angular frequency difference Δω between the waves adjacent to the frequency of the three - tone signal among the signals obtained by the first detection step and blocking the frequency component twice the angular frequency difference Δω and the DC component, a second detection step of detecting the signal that has passed through the band - pass filter step, a voltage measurement step of measuring the voltage of the signal obtained by the second detection step, and a phase calculation step of setting the phase ψ of the following formula (11) to 0 and π / 2 and π, respectively, and calculating the phase φ2″ represented by the following formula (12) from the respective voltage values measured by executing the three - tone signal generation step, the first detection step, the band - pass filter step, the second detection step, and the voltage measurement step. It is characterized by including the above steps.

Equation

[0021] With this configuration, for the three - tone signals of the three patterns (ψ = 0, π / 2, π) represented by the above formula (11), by measuring the power of the beat component of the angular frequency Δω, even when the amplitudes a1, a2, a3 of the three - tone signal are unknown and not equal to each other, the phase relationship (second - derivative value) of the three - tone represented by the above formula (12) can be calculated. As a result, by using a voltmeter or detector that does not require a high - speed trigger operation, a phase - characteristic measurement method that can realize phase measurement relatively inexpensively without using a large - scale device can be provided. Also, E beat it is not affected by the offset generated during the measurement of E(ψ).

[0022] In order to achieve the above object, the phase characteristic measurement method according to the present invention includes a three-tone signal generation step of generating a three-tone signal obtained by combining three waves e1, e2, and e3 represented by the following formula (13), a first detection step of detecting the three-tone signal, and among the signals obtained by the first detection step, a band-pass filter step of passing a frequency component of an angular frequency difference Δω between waves adjacent to the frequency of the three-tone signal and blocking a frequency component twice the angular frequency difference Δω and a DC component, a second detection step of detecting the signal passed through in the band-pass filter step, a voltage measurement step of measuring the voltage of the signal obtained by the second detection step, and setting the phase ψ in the following formula (13) to 0, π / 2, and π, and respectively executing the three-tone signal generation step, the first detection step, the band-pass filter step, the second detection step, and the voltage measurement step, and calculating a phase φ2″ represented by the following formula (14) from each measured voltage value. [Number] (However, a1, a2, and a3 represent amplitudes, ω1, ω2, and ω3 represent angular frequencies, φ1, φ2, φ3, and ψ represent phases, t represents time, ψ = 0, π / 2, π, and ω2 - ω1 = ω3 - ω2 = Δω.) [Number] (However, E beat (0) represents a value proportional to the power of the signal passed through in the band-pass filter step obtained from the voltage value measured in the voltage measurement step when ψ = 0, and E beat (π / 2) represents a value proportional to the power of the signal passed through in the band-pass filter step obtained from the voltage value measured in the voltage measurement step when ψ = π / 2, and E beat (π) represents a value proportional to the power of the signal passed through in the band-pass filter step obtained from the voltage value measured in the voltage measurement step when ψ = π.)

[0023] With this configuration, for the three-tone signals of the three patterns (ψ = 0, π / 2, π) represented by the above formula (13), by measuring the power of the beat component of the angular frequency Δω, even when the amplitudes a1, a2, and a3 of the three-tone signals are unknown and not equal to each other, the phase relationship (second derivative value) of the three tones represented by the above formula (14) can be calculated. By using the atan2 function in the above formula (14), the phase measurement range becomes wider compared to the case of using the tan function in the above formula (12). -1 As a result, by using a voltmeter or a detector that does not require a high-speed trigger operation, a phase characteristic measurement method capable of realizing phase measurement at a relatively low cost without using a large-scale device can be provided. Also, it is not affected by the offset generated during the measurement of E beat (ψ).

[0024] The signal generation method according to the present invention includes a three-tone signal generation step of generating a three-tone signal using a high-frequency signal generation unit, a phase characteristic measurement method according to any one of the above, which measures the phase characteristic of the high-frequency signal generation unit by measuring the phase of the three-tone signal generated in the three-tone signal generation step, and a high-frequency signal generation step of generating a high-frequency signal using the high-frequency signal generation unit and outputting it as an output signal, and is characterized in that the phase characteristic of the high-frequency signal is corrected based on the phase characteristic of the high-frequency signal generation unit measured by the phase characteristic measurement method.

[0025] With this configuration, an effect similar to the effect described above for the phase characteristic measurement method can be obtained, and since the phase characteristic of the high-frequency signal can be corrected based on the phase characteristic of the high-frequency signal generation unit measured by the phase characteristic measurement method, it becomes possible to generate a high-frequency signal with good phase characteristics.

[0026] In order to achieve the above object, the signal analysis method according to the present invention includes a three-tone signal generation step of generating a three-tone signal using a reference signal generation unit, a phase characteristic measurement method of measuring the phase characteristic of the reference signal generation unit by measuring the phase characteristic of the three-tone signal generated in the three-tone signal generation step, a reference signal generation step of generating a reference signal using the reference signal generation unit, a reference signal analysis step of measuring the phase characteristic of the reference signal using a high-frequency signal analysis unit, and a high-frequency signal analysis step of analyzing an input signal using the high-frequency signal analysis unit. The phase characteristic of the high-frequency signal analysis unit is calculated from the phase characteristic of the reference signal generation unit measured by the phase characteristic measurement method and the phase characteristic of the reference signal measured by the reference signal analysis step. Based on the calculated phase characteristic of the high-frequency signal analysis unit, the phase characteristic when analyzing the input signal in the high-frequency signal analysis step is corrected, and signal analysis of the input signal with the corrected phase characteristic is performed.

[0027] As described above, the phase characteristic of the reference signal generation unit is measured by the phase characteristic measurement method, and the phase characteristic of the high-frequency signal analysis unit is measured by analyzing a reference signal having a known phase characteristic in the high-frequency signal analysis step. Based on the measured phase characteristic of the high-frequency signal analysis unit, the phase characteristic when analyzing the input signal is corrected. Thereby, the same effect as the effect described above for the phase characteristic measurement method can be obtained, and signal analysis with the corrected phase characteristic can be performed, so that the quality of the analysis can be improved.

Advantages of the Invention

[0028] According to the present invention, it is possible to provide a phase characteristic measuring device capable of avoiding the enlargement of the device used for phase measurement and realizing phase measurement at a relatively low cost, a signal generation device and a signal analysis device equipped with the same, and a phase characteristic measurement method.

Brief Description of the Drawings

[0029]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Embodiments for Carrying Out the Invention

[0030] Hereinafter, embodiments of the present invention will be described with reference to the drawings.

[0031] First, the measurement principle of the phase characteristic measurement system using a detector, which is used in the embodiments of the present invention, will be described. FIG. 1 shows a schematic configuration of a phase characteristic measurement system 10 according to an embodiment of the present invention. First, a three-tone signal in which three waves (frequencies f1, f2, f3) in the high-frequency band are combined is input to a first detector 11. The frequencies of each tone of the three-tone signal are equally spaced (f2 - f1 = f3 - f2). The first detector 11 performs square-law detection on the input three-tone signal and outputs a detection result at a frequency lower than the frequencies of the three-tone signal. Therefore, a DC component proportional to the average power of the three-tone signal and beats between each tone are generated from the first detector 11. The frequency of the beat between the wave of frequency f1 and the wave of frequency f2 is f2 - f1, the frequency of the beat between the wave of frequency f2 and the wave of frequency f3 is f3 - f2, and the frequency of the beat between the wave of frequency f1 and the wave of frequency f3 is f3 - f1. Therefore, from the first detector 11, a DC component, a frequency component with a frequency interval Δf (= f2 - f1 = f3 - f2) between adjacent waves, and a frequency component with a frequency interval 2Δf (= f3 - f1) between the waves at both ends are output. A band-pass filter (BPF) 12 removes the DC component and the frequency component that is twice the tone interval Δf (= f2 - f1 = f3 - f2), and allows only the tone interval frequency component to pass through. That is, the beat components with frequencies f2 - f1 and f3 - f2 are extracted by the BPF 12. The beat component output from the BPF 12 is input to a second detector 13. The second detector 13 performs square-law detection on the input beat component and outputs a detection result at a frequency lower than the frequency of the beat component. Since the beat component input to the second detector 13 is a sine wave with a constant amplitude, a DC voltage proportional to the power of the beat component is output from the second detector 13. That is, the power of the sum signal of the two beat components extracted by the BPF 12 is detected by the second detector 13, and its magnitude is measured by a voltmeter 14. Although the phase of the beat component output from the first detector 11 changes according to the phase of the three-tone signal, since the two beat components of f2 - f1 and f3 - f2 have the same frequency, they interfere with each other, and the power of the beat component with frequency Δf changes according to the phase of the beat component.By changing the phase of any one of the three tones of the three-tone signal and measuring the change in the power of the beat component of the frequency Δf at that time with the second detector 13 and the voltmeter 14, the phase relationship (second derivative value) of the three tones can be calculated using the calculation formula described later. By step-sweeping the frequencies of the three-tone signal, the phase characteristics in an arbitrary frequency range can be obtained.

[0032] As the second detector 13, not only a detector that outputs a voltage proportional to the power of the input signal but also a detector that outputs a voltage proportional to the logarithm of the power of the input signal can be used. When using a detector with logarithmic output, the output voltage of the detector is converted into the input power of the detector by the following formula (15). However, P in is the input power of the detector, V out is the output voltage of the detector, α is the sensitivity of the detector (unit: V / dB), and P interc is the input power (logarithmic intercept) corresponding to the output voltage being zero.

Equation

[0033] (First Embodiment) FIG. 2 and FIG. 3 are diagrams showing the configuration of a phase characteristic measuring device according to the first embodiment of the present invention. As shown in FIGS. 2 and 3, the phase characteristic measuring device 1 of the first embodiment includes a first detector 11, a BPF 12, a second detector 13, a voltmeter 14, and a phase calculator 15.

[0034] Specifically, the first detector 11 receives a three-tone signal obtained by combining three waves in a high-frequency band and detects the power of the three-tone signal. The BPF 12 passes the frequency component of the signal output from the first detector 11, which has an angular frequency difference Δω (= ω2 - ω1 = ω3 - ω2) between adjacent waves of the three-tone signal, and blocks the frequency component that is twice the angular frequency difference Δω and the DC component. Note that the first detector 11 may be composed of, for example, a detector using a diode, as long as it has the characteristic of detecting a three-tone signal obtained by combining three waves e1, e2, and e3 and outputting a beat component with an angular frequency Δω. The second detector 13 detects the power of the beat component that has passed through the BPF 12. Note that the second detector 13 may be composed of, for example, a detector using a diode, as long as it has the characteristic of detecting the tone interval angular frequency Δω of the three-tone signal. The voltmeter 14 measures the voltage of the signal output from the second detector 13. Note that the voltmeter only needs to be able to measure the voltage corresponding to the output of the detector 13. For example, either the anode or the cathode of a detector using a diode is connected to one end of the voltmeter, and the other end is connected to a reference potential such as ground. Note that if the reference potential is stable, the other end of the voltmeter does not necessarily have to be ground. The phase calculator 15 calculates the phase relationship and calculates the phase characteristics as will be described later. The voltmeter 14 in the figure may also be an ammeter. Note that the ammeter only needs to be able to measure the current corresponding to the output of the detector 13. For example, either the anode or the cathode of a detector using a diode is connected to one end of the ammeter. The other end of the ammeter is connected to the reference potential, and a predetermined bias voltage may be applied to the diode. Note that in the calculation formula described later, in order to calculate the ratio of the power of the beat component, it is sufficient to obtain a value proportional to the power of the signal that has passed through the BPF 12. When the second detector 13 outputs a voltage or current proportional to the input power, the measured voltage value or current value may be used as it is.

[0035] Here, a method for generating a three-tone signal input to the first detector 11 and a method for calculating the phase in the phase calculator 15 will be described. Two methods will be described: a simple method that can be used when all three tones have equal amplitudes, and a method that can be used even when the amplitudes of the three tones are unknown and unequal.

[0036] <When all three tones have equal amplitudes> First, with reference to FIG. 2, the case where all three tones have equal amplitudes will be described. The three-tone signals are respectively

Equation

[0037] Only the beat component having an angular frequency of Δω is extracted from this signal by the BPF 12. Defining the operator for extracting only the component with an angular frequency of Δω by the BPF Δω [] as, the beat component extracted by the BPF 12 is expressed as in the following equation (17).

Equation

[0038] Therefore, when the power E beat of this beat component is detected by the second detector 13 and measured by the voltmeter 14

Equation

[0039] Similarly, the first detector 11 detects the second three-tone signal (pattern 2) obtained by combining the three waves e′1, e′2, e′3 represented by the following formula (19). ω in formula (19) i , φ i , i = 1, 2, 3 are respectively ω in formula (16) i , φ i , i = 1, 2, 3 and are the same.

Number

[0040] The beat component extracted by the BPF12 at this time is the BPF Δω [(e′1 + e′2 + e′3) 2 , and its power E′ beat is detected by the second detector 13 and measured by the voltmeter 14, then

Number

[0041] Therefore, the second-order differential φ2″ of the phase at the angular frequency ω2 is represented by the following formula (21) and is calculated by the phase calculator 15. The phase calculation method in formula (21) is based on the division of E′ beat / E beat . Since the result does not change even if E′ beat and E beat are multiplied by a constant multiple, E′ beat and E beat may be values proportional to the power of the beat component extracted by the BPF12.

Number

[0042] If the frequency of the three-tone signal is swept and the second derivative value of the phase within the band to be measured is obtained by the above formula (21), the frequency characteristic of the phase can be obtained by integrating the second derivative value of the phase twice according to the following formula (22). This frequency characteristic of the phase is calculated by, for example, the phase calculator 15. θ0 and θ0' in formula (22) are the initial phase and the initial phase slope, respectively, and are arbitrary integration constants.

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[0043] Here, the sign of the argument in formula (21) becomes indefinite. That is, it is difficult to distinguish between positive and negative in the measurement where φ2″ is near zero. Therefore, a known phase difference is given to the three-tone signal (pattern 1) and the second three-tone signal (pattern 2), for example, φ2″Δω 2 =π / 2 as the center and measure so that 0 < φ2″Δω 2 <π.

[0044] <When the amplitudes of the three tones are unknown> Next, the case where the amplitudes of the three tones are unknown and unequal amplitudes will be described. In the above description, the case where the amplitudes of the tone signals are all equal was considered, but actually there is a frequency characteristic of the amplitude, and the amplitudes of each tone signal are unknown and unequal. Let the three-tone signals be

Number

[0045] When the three-tone signal obtained by combining the three-tone signals e1, e2(ψ), and e3 is detected by the first detector 11 and the component of the angular frequency Δω is extracted by the BPF12, the BPF Δω [(e1 + e2(ψ) + e3) 2 is obtained, and its power is E beatDefine it as (ψ). Detect the output signal of BPF12 with the second detector 13, and measure the output voltage of the detector 13 with the voltmeter 14 to obtain E beat When (ψ) is obtained, especially when focusing on ψ = 0, π / 2, π and calculating the power, [Number] it becomes.

[0046] From this result, the second derivative of the phase is [Number] it becomes. Since the value range of the tan -1 function is from -π / 2 to +π / 2, for example, it is desirable to measure within the range of -π / 2 < φ2″Δω 2 < π / 2 centered around φ2″Δω 2 = 0.

[0047] Also, using the atan2 function, [Number] it becomes, and the phase measurement is possible for φ2″Δω 2 within the range of 2π. Since the value range of the atan2 function is from -π to +π, for example, it is desirable to measure within the range of -π < φ2″Δω 2 < π centered around φ2″Δω 2 = 0. The phase calculator 15 performs the calculation of Equation (25) or Equation (26) to obtain the second derivative value φ2″ of the phase at the angular frequency ω2. The phase calculation methods of Equation (25) and Equation (26) are such that even when a DC offset E beat is added during the measurement of (ψ) (E DC ), (E beat (0) + E DC ) - 2(E beat (π / 2) + E DC ) + (E beat (π) + E DC ) = E beat (0) - 2E beat(π / 2)+E beat (π), (E beat (0)+E DC )-(E beat (π)+E DC )=E beat (0)-E beat (π) becomes E DC Since all are canceled out, E beat It also has the effect of removing the DC offset during the measurement of (ψ). Also, the phase calculation methods of equations (25) and (26) are, E beat (0)-2E beat (π / 2)+E beat (π) and E beat (0)-E beat (π) is based on the ratio of, E beat Since the result does not change even if (ψ) is multiplied by a constant, E beat (ψ) may be a value proportional to the power of the beat component extracted by BPF12. Similarly to the above, by sweeping the frequencies of the three-tone signal and integrating the second derivative value of the phase twice by equation (22), the frequency characteristics of the phase can be calculated.

[0048] [Definition of atan2 function] atan2(y, x) is a function that returns the argument of the point (x, y) in the Cartesian coordinate system. The possible value range is -π < atan2 ≤ π.

[0049] Figure 3 shows a configuration example of the phase characteristic measuring device 1 when the amplitudes of the three tones are unknown. As shown in Figure 3, the first detector 11 receives three-tone signals obtained by combining the three waves represented by the above equation (23) in three patterns (ψ = 0, π / 2, π), and detects the power of each three-tone signal. BPF12 passes the frequency component of the angular frequency difference Δω (= ω2 - ω1 = ω3 - ω2) between adjacent waves of the three-tone signal among the signals output from the first detector 11, and blocks the frequency component twice the angular frequency difference Δω and the DC component. The second detector 13 and the voltmeter 14 are for the power E of the beat component that has passed through BPF12 beat(ψ) is to be measured. The phase calculator 15 is configured to calculate the phase relationship (second derivative value) represented by the above formula (25) or the above formula (26) and calculate the phase characteristics.

[0050] The phase characteristic measurement technique presented in this specification can be applied not only to an apparatus for measuring phase characteristics but also to a signal generator (SG) and a signal analyzer (SA) incorporating the same. As a result, an improvement in the demodulation quality of broadband signals is expected.

[0051] (Second Embodiment) Next, a signal generator equipped with a phase characteristic measuring device will be described.

[0052] FIG. 4 shows a schematic configuration of a signal generator 100 equipped with a phase characteristic measuring device 1, and FIG. 5 shows a detailed configuration. As shown in FIGS. 4 and 5, the signal generator 100 includes a phase characteristic measuring device 1, a high-frequency signal generation unit 2, and a coupler 3. The phase characteristics of the high-frequency signal generation unit 2 are corrected based on the phase characteristics of the high-frequency signal generation unit 2 measured by the phase characteristic measuring device 1.

[0053] Specifically, the high-frequency signal generation unit 2 includes a signal source 21, a frequency conversion unit 22, and a local signal generation unit 23. Using the local signal generation unit 23 that generates a CW local signal and a frequency conversion unit 22 such as a mixer, the signal generated by the signal source 21 is frequency-converted (up-converted) to a high-frequency band frequency to output a high-frequency signal. The coupler 3 branches the high-frequency signal output from the high-frequency signal generation unit 2, outputs one signal as an output signal, and outputs the other signal to the phase characteristic measuring device 1. The phase characteristic measuring device 1 receives the high-frequency signal branched by the coupler 3 and measures the phase characteristics of the input signal.

[0054] Specifically, as shown in FIG. 5, the high-frequency signal generation unit 2 includes intermediate frequency signal generators 24a to 24c, an adder 25, a switch 26, a frequency conversion unit 22, a local signal generation unit 23, a waveform memory 27, and a D / A converter 28.

[0055] When the switch 26 is set to contact A, the high-frequency signal generation unit 2 adds (combines) the sine-wave intermediate-frequency signals generated by the intermediate-frequency signal generators 24a to 24c with an adder 25, and frequency-converts (up-converts) them with a frequency conversion unit 22 and outputs them as a 3-tone signal in the high-frequency band. A part of the 3-tone signal output from the high-frequency signal generation unit 2 is sent to the phase characteristic measuring device 1 via the coupler 3, and the phase characteristic of the high-frequency signal generation unit 2 is measured.

[0056] In the waveform memory 27, the signal generated by the high-frequency signal generation unit 2 is generated in advance by digital operation and stored. When the switch is set to contact B, the data in the waveform memory 27 is input to a D / A converter 28, converted into an analog signal, and frequency-converted (up-converted) by the frequency conversion unit 22 and output as a high-frequency signal. At this time, by applying the inverse characteristic of the phase characteristic of the high-frequency signal generation unit 2 measured in advance to the waveform memory 27 of the high-frequency signal generation unit 2, a high-frequency signal with corrected phase characteristics is output, and the modulation quality of the high-frequency signal generation unit 2 can be improved. In FIG. 5, the inverse characteristic of the phase characteristic is applied to the signal recorded in the waveform memory 27, but it is also possible to correct the phase characteristic by applying a filter having the inverse phase characteristic of the phase characteristic to the digital signal output from the waveform memory 27.

[0057] Since this signal generator 100 can output a signal with corrected phase characteristics, it can be used as a reference signal for correcting the phase characteristics of an external high-frequency signal receiving device or the like. In that case, the switch 26 may be set to contact A to output a three-tone signal, or set to contact B to output a broadband signal (for example, a multi-tone signal of three or more waves). When the switch 26 is set to contact A, the inverse characteristic of the phase characteristic of the high-frequency signal generation unit 2 measured by the phase characteristic measuring device 1 may be set as the initial phase of the intermediate frequency signal generators 24a to 24c. When the switch 26 is set to contact B, the inverse characteristic of the phase characteristic of the high-frequency signal generation unit 2 measured by the phase characteristic measuring device 1 may be applied to the waveform memory 27 to output a broadband signal with corrected phase characteristics. Note that the coupler 3 may be, for example, a switch or the like. When the coupler 3 is replaced with a second switch, when the second switch is set to send a signal to the phase characteristic measuring device 1, it performs a calibration operation, while when the second switch is set to the output side, the switch 26 can be set to contact B and then perform an operation of generating a signal.

[0058] (Third Embodiment) Next, a signal analysis device provided with a phase characteristic measuring device will be described.

[0059] FIG. 6 shows a schematic configuration of a signal analysis device 200 provided with a phase characteristic measuring device 1, and FIG. 7 shows a detailed configuration. As shown in FIGS. 6 and 7, the signal analysis device 200 includes a phase characteristic measuring device 1, a reference signal generation unit 20, a coupler 3, a switch 4, and a high-frequency signal analysis unit 5. The phase characteristic of the reference signal generation unit 20 is measured by the phase characteristic measuring device 1, and by inputting a reference signal having a known phase characteristic from the reference signal generation unit 20 to the high-frequency signal analysis unit 5, the phase characteristic of the high-frequency signal analysis unit 5 is measured, and the phase characteristic of the high-frequency signal analysis unit 5 is corrected based on the measured phase characteristic of the high-frequency signal analysis unit 5. Then, the input signal is analyzed by the high-frequency signal analysis unit 5 with corrected phase characteristics.

[0060] Specifically, the reference signal generation unit 20 includes a signal source 21, a frequency conversion unit 22, and a local oscillation signal generation unit 23. Using the local oscillation signal generation unit 23 that generates a CW local oscillation signal and the frequency conversion unit 22 such as a mixer, the signal generated by the signal source 21 is frequency-converted (up-converted) to a high-frequency band frequency to output a reference signal. The coupler 3 branches the reference signal output from the reference signal generation unit 20 and outputs one signal to the phase characteristic measuring device 1. The switch 4 sends the other signal branched by the coupler 3 to the high-frequency signal analysis unit 5. The phase characteristic measuring device 1 receives the reference signal branched by the coupler 3 and measures the phase characteristic of the input signal. The switch 4 selects either the other signal of the reference signal branched by the coupler 3 or the input signal. The high-frequency signal analysis unit 5 includes a frequency conversion unit 51, a local oscillation signal generation unit 52, and a signal processing unit 53. The signal selected by the switch 4 is frequency-converted (down-converted) by the frequency conversion unit 51 and the local oscillation signal generation unit 52, and signal analysis is performed by the signal processing unit 53.

[0061] Specifically, as shown in FIG. 7, the reference signal generation unit 20 includes intermediate frequency signal generators 24a to 24c, an adder 25, a frequency conversion unit 22, and a local oscillation signal generation unit 23. The high-frequency signal analysis unit 5 includes a frequency conversion unit 51, a local oscillation signal generation unit 52, an A / D converter 54, a phase response correction unit 55, a waveform memory 56, a second switch 57, a reference signal phase measurement unit 58, and a phase response correction value calculation unit 59.

[0062] First, the phase characteristic of the reference signal generation unit 20 is measured by the phase characteristic measuring device 1. Specifically, the reference signal generation unit 20 adds (combines) the sine wave intermediate frequency signals generated by the intermediate frequency signal generators 24a to 24c using the adder 25, and frequency-converts (up-converts) them using the frequency conversion unit 22 to output a 3-tone signal in the high-frequency band. A part of the 3-tone signal output from the reference signal generation unit 20 is sent to the phase characteristic measuring device 1 via the coupler 3, and the phase characteristic of the reference signal generation unit 20 is measured.

[0063] Next, set switch 4 to contact point A and the second switch 57 to contact point B. By inputting a broadband signal with known phase characteristics (described as a 3-tone signal in FIG. 7, but may be, for example, a multi-tone signal of 4 waves or more) from the reference signal generation unit 20 as a reference signal to the high-frequency signal analysis unit 5, the phase characteristics of the high-frequency signal analysis unit 5 are measured. Specifically, the reference signal sent from the reference signal generation unit 20 via switch 4 is frequency-converted (down-converted) by the frequency conversion unit 51 and the local oscillation signal generation unit 52 in the high-frequency signal analysis unit 5, converted into a digital signal by the A / D converter 54, sent to the reference signal phase measurement unit 58 via the second switch 57, and the phase characteristics of the reference signal are measured in the reference signal phase measurement unit 58. In FIG. 7, the reference signal is a 3-tone signal. By obtaining the second derivative value of the phase of the 3-tone signal that has been frequency-converted and converted into a digital signal, and sweeping the frequency of the 3-tone signal and integrating the second derivative value of the phase twice, the phase characteristics of the reference signal can be obtained. When the reference signal is a multi-tone signal of 4 waves or more, the second derivative values of the phase at a plurality of frequencies are obtained at once, so the phase characteristics of the reference signal can be obtained with a small number of frequency sweep points. The phase response correction value calculation unit 59 calculates the phase characteristics of the high-frequency signal analysis unit 5 from the phase characteristics of the reference signal measured by the reference signal phase measurement unit 58 and the phase characteristics of the reference signal generation unit 20 measured by the phase characteristic measuring device 1. That is, the phase characteristics of the high-frequency signal analysis unit 5 are obtained by subtracting the phase characteristics of the reference signal generation unit 20 measured by the phase characteristic measuring device 1 from the phase characteristics of the reference signal measured by the reference signal phase measurement unit 58. Here, the phase characteristics of the high-frequency signal analysis unit 5 are calculated from the phase characteristics of the reference signal measured by the reference signal phase measurement unit 58 and the phase characteristics of the reference signal generation unit 20 measured by the phase characteristic measuring device 1. However, by setting the inverse characteristic of the phase characteristics of the reference signal generation unit 20 measured by the phase characteristic measuring device 1 to the initial phase of the intermediate frequency signal generators 24a to 24c, the phase of the reference signal generated by the reference signal generation unit 20 may be corrected. In this case, since the reference signal with corrected phase characteristics is input to the high-frequency signal analysis unit 5, the phase characteristics of the reference signal measured by the reference signal phase measurement unit 58 become the phase characteristics of the high-frequency signal analysis unit 5.

[0064] When the switch 4 is set to the contact point B and the second switch 57 is set to the contact point A, the input signal is frequency-converted (down-converted) by the frequency conversion unit 51 and the local signal generation unit 52, converted into a digital signal by the A / D converter 54, the phase characteristic of the high-frequency signal analysis unit 5 is corrected by the phase response correction unit 55, stored in the waveform memory 56, and output as analysis data. That is, by applying a digital filter having the inverse characteristic of the phase characteristic of the high-frequency signal analysis unit 5 to the phase response correction unit 55, signal analysis with the phase characteristic of the high-frequency signal analysis unit 5 corrected is performed, and the analysis quality (demodulation quality) can be improved.

[0065] In FIG. 7, a digital filter having the inverse characteristic of the phase characteristic of the high-frequency signal analysis unit 5 is applied to the digital signal output from the A / D converter 54 to correct the phase characteristic. However, the digital signal output from the A / D converter 54 may be temporarily stored in the waveform memory 56, and the phase characteristic may be corrected by applying the inverse characteristic of the phase characteristic to the waveform data in the waveform memory 56 by offline processing. Also, the coupler 3 in the figure may be a switch, for example, and the switch 4 may be a coupler or the like, for example.

Industrial Applicability

[0066] As described above, the present invention has the effect of avoiding the enlargement of the device used for phase measurement and realizing phase measurement at a relatively low cost by using a voltmeter or a detector that does not require a high-speed trigger operation, and is useful for the entire phase characteristic measuring instrument, a signal generation device and a signal analysis device equipped with the same, and a phase characteristic measuring method.

Explanation of Reference Numerals

[0067] 1 Phase characteristic measuring instrument 10 Phase characteristic measuring system 11 First detector 12 Band-pass filter (BPF) 13 Second detector 14 Voltmeter 15 Phase calculator 2 High-frequency signal generator 20 Reference signal generator 21 Signal source 22 Frequency conversion unit 23 Local signal generator 24a, 24b, 24c Intermediate frequency signal generator 25 Adder 26 Switch 27 Waveform memory 28 D / A converter 3 Coupler 4 Switch 5 High-frequency signal analysis unit 51 Frequency conversion unit 52 Local signal generator 53 Signal processing unit 54 A / D converter 55 Phase response correction unit 56 Waveform memory 57 Second switch 58 Reference signal phase measurement unit 59 Phase response correction value calculation unit 100 Signal generator 200 Signal analyzer

Claims

1. The first three-tone signal obtained by multiplexing three waves e １ , e ２ , e ３ according to the following formula (1) and three waves e' １ , e' ２ , e' ３ according to the following formula (2), and a first detector (11) that receives and detects the second three-tone signal obtained by multiplexing them respectively Among the signals output from the first detector, a band-pass filter (12) that passes the frequency components of the angular frequency difference Δω between waves adjacent in frequency of each of the first and second three-tone signals and blocks the frequency component that is twice the angular frequency difference Δω and the DC component; A second detector (13) that detects the signal that has passed through the band-pass filter; A voltmeter (14) that measures the voltage of the signal output from the second detector; The phase φ represented by the following formula (3) ２ ″ and a phase calculator (15) for calculating A phase characteristic measuring device comprising the above. 【Number 1】 (However, ω ｉ is the angular frequency, φ ｉ is the phase, t represents time, and ω ２ - ω １ = ω ３ - ω ２ = Δω.) 【Number 2】 【Number 3】 (However, E ｂｅａｔ represents a value proportional to the power of the signal that has passed through the band-pass filter obtained from the voltage value measured by the voltmeter when the first detector receives the first three-tone signal, and E' ｂｅａｔ represents a value proportional to the power of the signal that has passed through the band-pass filter obtained from the voltage value measured by the voltmeter when the first detector receives the second three-tone signal.)

2. A first detector (11) that receives and detects a three-tone signal obtained by multiplexing three waves e １ , e ２ , e ３ represented by the following formula (4); Among the signals output from the first detector, a band-pass filter (12) that passes the frequency components of the angular frequency difference Δω between waves adjacent in frequency of the three-tone signal and blocks the frequency component that is twice the angular frequency difference Δω and the DC component; A second detector (13) that detects the signal that has passed through the band-pass filter; A voltmeter (14) that measures the voltage of the signal output from the second detector; The phase φ represented by the following formula (5) ２ ″ and a phase calculator (15) for calculating A phase characteristic measuring device comprising the above. 【Number 4】 (However, a １ , a ２ , a ３ is the amplitude, ω １ , ω ２ , ω ３ is the angular frequency, φ １ , φ ２ , φ ３ , ψ is the phase, t is the time, ψ = 0, π / 2, π, and ω ２ - ω １ = ω ３ - ω ２ = Δω. ) 【Number 5】 (However, E ｂｅａｔ (0) represents a value proportional to the power of the signal that has passed through the band-pass filter, which is obtained from the voltage value measured by the voltmeter when the first detector receives the three-tone signal at ψ = 0, and E ｂｅａｔ (π / 2) represents a value proportional to the power of the signal that has passed through the band-pass filter, which is obtained from the voltage value measured by the voltmeter when the first detector receives the three-tone signal at ψ = π / 2, and E ｂｅａｔ (π) represents a value proportional to the power of the signal that has passed through the band-pass filter, which is obtained from the voltage value measured by the voltmeter when the first detector receives the three-tone signal at ψ = π.)

3. A first detector (11) that receives and detects a three-tone signal obtained by combining three waves e １ , e ２ , e ３ represented by the following formula (6); Among the signals output from the first detector, a band-pass filter (12) that passes the frequency components of the angular frequency difference Δω between waves adjacent in frequency of the three-tone signal and blocks the frequency component that is twice the angular frequency difference Δω and the DC component; A second detector (13) that detects the signal that has passed through the band-pass filter; A voltmeter (14) that measures the voltage of the signal output from the second detector; The phase φ represented by the following formula (7) ２ ″ and a phase calculator (15) for calculating A phase characteristic measuring device comprising the above. 【Number 6】 (However, a １ , a ２ , a ３ is the amplitude, ω １ , ω ２ , ω ３ is the angular frequency, φ １ , φ ２ , φ ３ , ψ is the phase, t is the time, ψ = 0, π / 2, π, and ω ２ - ω １ = ω ３ - ω ２ = Δω. ) 【Number 7】 (However, E ｂｅａｔ (0) represents a value proportional to the power of the signal that has passed through the band-pass filter, which is obtained from the voltage value measured by the voltmeter when the first detector receives the three-tone signal at ψ = 0, and E ｂｅａｔ (π / 2) represents a value proportional to the power of the signal that has passed through the band-pass filter, which is obtained from the voltage value measured by the voltmeter when the first detector receives the three-tone signal at ψ = π / 2, and E ｂｅａｔ (π) represents a value proportional to the power of the signal that has passed through the band-pass filter, which is obtained from the voltage value measured by the voltmeter when the first detector receives the three-tone signal at ψ = π.)

4. A high-frequency signal generation unit (2) that generates a high-frequency signal and a three-tone signal; A coupler (3) that branches the signal output from the high-frequency signal generation unit and outputs one of the signals as an output signal; When the high-frequency signal generation unit generates the three-tone signal, the other signal branched by the coupler is input, and the phase characteristic of the high-frequency signal generation unit is measured by measuring the phase of the input three-tone signal. The phase characteristic measuring device (1) according to any one of claims 1 to 3; A signal generation device comprising the above, wherein when the high-frequency signal generation unit generates the high-frequency signal, the phase characteristic of the high-frequency signal is corrected based on the phase characteristic of the high-frequency signal generation unit measured by the phase characteristic measuring device.

5. A reference signal generation unit (20) that generates a reference signal and a three-tone signal; A coupler (3) that branches the signal output from the reference signal generation unit; When the reference signal generation unit generates the three-tone signal, one of the signals branched by the coupler is input, and the phase characteristic of the reference signal generation unit is measured by measuring the phase of the input three-tone signal. The phase characteristic measuring device (1) according to any one of claims 1 to 3, A switch (4) for selecting either one of the other signal branched by the coupler and the input signal; A high-frequency signal analysis unit (5) for analyzing the signal selected by the switch; Comprising: when the reference signal generation unit generates the reference signal and the other signal branched by the coupler is selected by the switch, the phase characteristic of the reference signal measured by the high-frequency signal analysis unit and the phase characteristic of the reference signal generation unit measured by the phase characteristic measuring device, the phase characteristic of the high-frequency signal analysis unit is calculated, and when the input signal is selected by the switch, based on the calculated phase characteristic of the high-frequency signal analysis unit, the phase characteristic when the high-frequency signal analysis unit analyzes the input signal is corrected, and signal analysis of the input signal with the corrected phase characteristic is performed. A signal analysis device characterized by that.

6. A first three-tone signal generation step of generating a first three-tone signal obtained by multiplexing three waves e １ , e ２ , e ３ ; A first detection step of detecting the first three-tone signal; Among the signals obtained by the first detection step, a first band-pass filter step of passing a frequency component of an angular frequency difference Δω between waves adjacent to the frequency of the first three-tone signal and blocking a frequency component twice the angular frequency difference Δω and a DC component; A second detection step of detecting the signal passed through in the first band-pass filter step; A first voltage measurement step of measuring the voltage of the signal obtained by the second detection step; The second three-tone signal generating step of generating a second three-tone signal obtained by multiplexing three waves e′, e′, and e′ represented by the following formula (9): １ , e′ ２ , e′ ３ ​ A third detection step of detecting the second three-tone signal; Among the signals obtained by the third detection step, a second band-pass filter step of passing a frequency component of an angular frequency difference Δω between waves adjacent to the frequency of the second three-tone signal and blocking a frequency component twice the angular frequency difference Δω and a DC component; A fourth detection step of detecting the signal passed through in the second band-pass filter step; A second voltage measurement step of measuring the voltage of the signal obtained by the fourth detection step; A phase calculation step of calculating a phase φ represented by the following formula (10) from the voltage value measured in the first voltage measurement step and the voltage value measured in the second voltage measurement step ２ ″; and A phase characteristic measurement method including that. 【Number 8】 (where ω ｉ is the angular frequency, φ ｉ is the phase, t is the time, ω ２ - ω １ = ω ３ - ω ２ = Δω.) 【Number 9】 【Number 10】 (However, E ｂｅａｔ represents a value proportional to the power of the signal that has passed through the first band-pass filter step obtained from the voltage value measured in the first voltage measurement step, and E' ｂｅａｔ represents a value proportional to the power of the signal that has passed through the second band-pass filter step obtained from the voltage value measured in the second voltage measurement step.)

7. A three-tone signal generation step of generating a three-tone signal obtained by multiplexing three waves e １ , e ２ , e ３ ; and A first detection step of detecting the three-tone signal; Among the signals obtained by the first detection step, a band-pass filter step of passing a frequency component of an angular frequency difference Δω between waves adjacent in frequency of the three-tone signal and blocking a frequency component twice the angular frequency difference Δω and a DC component; A second detection step of detecting the signal that has passed through the band-pass filter step; A voltage measurement step of measuring the voltage of the signal obtained by the second detection step; Set the phase ψ of the following formula (11) to 0, π / 2, and π, and perform the three-tone signal generation step, the first detection step, the band-pass filter step, the second detection step, and the voltage measurement step respectively, and calculate the phase φ represented by the following formula (12) from each voltage value measured. ２ ″ A phase calculation step for calculating; A phase characteristic measurement method including the above. 【Number 11】 (However, a １ , a ２ , a ３ is the amplitude, ω １ , ω ２ , ω ３ is the angular frequency, φ １ , φ ２ , φ ３ , ψ is the phase, t is the time, ψ = 0, π / 2, π, and ω ２ - ω １ = ω ３ - ω ２ = Δω. ) 【Number 12】 (However, E ｂｅａｔ (0) represents a value proportional to the power of the signal that has passed through the band-pass filter step obtained from the voltage value measured in the voltage measurement step when ψ = 0, and E ｂｅａｔ (π / 2) represents a value proportional to the power of the signal that has passed through the band-pass filter step obtained from the voltage value measured in the voltage measurement step when ψ = π / 2, and E ｂｅａｔ (π) represents a value proportional to the power of the signal that has passed through the band-pass filter step obtained from the voltage value measured in the voltage measurement step when ψ = π.)

8. A three-tone signal generation step of generating a three-tone signal obtained by combining three waves e １ , e ２ , e ３ represented by the following formula (13); A first detection step of detecting the three-tone signal; Among the signals obtained by the first detection step, a band-pass filter step of passing a frequency component of an angular frequency difference Δω between waves adjacent in frequency of the three-tone signal and blocking a frequency component twice the angular frequency difference Δω and a DC component; A second detection step of detecting the signal that has passed through the band-pass filter step; A voltage measurement step of measuring the voltage of the signal obtained by the second detection step; Set the phase ψ of the following formula (13) to 0, π / 2, and π, and respectively execute the three-tone signal generation step, the first detection step, the band-pass filter step, the second detection step, and the voltage measurement step, and from each voltage value measured, calculate the phase φ ２ ″ by the following formula (14) in a phase calculation step, A phase characteristic measurement method including the above. 【Number 13】 (However, a １ , a ２ , a ３ is the amplitude, ω １ , ω ２ , ω ３ is the angular frequency, φ １ , φ ２ , φ ３ , ψ is the phase, t is the time, ψ = 0, π / 2, π, and ω ２ - ω １ = ω ３ - ω ２ = Δω. ) 【Number 14】 (However, E ｂｅａｔ (0) represents a value proportional to the power of the signal that has passed through the band-pass filter step obtained from the voltage value measured in the voltage measurement step when ψ = 0, and E ｂｅａｔ (π / 2) represents a value proportional to the power of the signal that has passed through the band-pass filter step obtained from the voltage value measured in the voltage measurement step when ψ = π / 2, and E ｂｅａｔ (π) represents a value proportional to the power of the signal that has passed through the band-pass filter step obtained from the voltage value measured in the voltage measurement step when ψ = π.)

9. A three-tone signal generation step of generating a three-tone signal using a high-frequency signal generation unit; The phase characteristic measurement method according to any one of claims 6 to 8, wherein the phase characteristic of the high-frequency signal generation unit is measured by measuring the phase of the three-tone signal generated by the three-tone signal generation step; A high-frequency signal generation step of generating a high-frequency signal using the high-frequency signal generation unit and outputting it as an output signal; A signal generation method, characterized in that the phase characteristic of the high-frequency signal is corrected based on the phase characteristic of the high-frequency signal generation unit measured by the phase characteristic measurement method.

10. A three-tone signal generation step of generating a three-tone signal using a reference signal generation unit; The phase characteristic measurement method according to any one of claims 6 to 8, wherein the phase characteristic of the reference signal generation unit is measured by measuring the phase characteristic of the three-tone signal generated by the three-tone signal generation step; A reference signal generation step of generating a reference signal using the reference signal generation unit; A reference signal analysis step of measuring the phase characteristic of the reference signal using a high-frequency signal analysis unit; A high-frequency signal analysis step of analyzing an input signal using the high-frequency signal analysis unit; including calculating the phase characteristic of the high-frequency signal analysis unit from the phase characteristic of the reference signal generation unit measured by the phase characteristic measurement method and the phase characteristic of the reference signal measured by the reference signal analysis step, correcting the phase characteristic when analyzing the input signal by the high-frequency signal analysis step based on the calculated phase characteristic of the high-frequency signal analysis unit, and performing signal analysis of the input signal with the corrected phase characteristic. A signal analysis method characterized by this is provided.

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