JPS6078361A - Pulse signal measuring device - Google Patents

Abstract

PURPOSE:To measure accurately a pulse width and a frequency by providing counters which measure high and low levels of an input waveform individually. CONSTITUTION:When the input waveform is in the high level, the number of clocks from a reference oscillator 1 is counted by a counter (CT)8a, and the value of the CT8a is loaded to a register (RG)10a when the operation of a CT8b is started. When the input waveform is in the low level, the number of clocks is counted by the CT8b, and the value of the CT8b is loaded to an RG10b when the CR8a is operated. A central operation processing part 12 sends high-level data from the RG10a to a memory part 13 during measurement of the low level and sends low-level data from the RG10b to the memory part 13 during measurement of the high level.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a pulse signal measuring device for random signals for measuring the pulse width and frequency of irregularly changing pulse signals.

[Prior Art] A pulse Doppler radar device determines the optimum pulse width of two periods of the transmission output depending on the distance to the target.

Therefore, when the distance to the target changes, the pulse width of the transmission output (9 cycles) also changes. Such a pulse
In order to evaluate the performance of the Doppler radar system, it was necessary to know how to change the nine-cycle pulse width of the transmission output.

Conventionally, there has been an instrument shown in FIG. 1 for measuring this type of signal.

In the figure, (1) is the reference oscillator that generates the basic clock, and (2) is the reference oscillator + 11 basic clock frequency divider, which opens and closes gates of 10 seconds, 1 second, 0.1 seconds, etc. (3) is a gate control unit that controls the measurement period; (4) is a main gate that passes only signals within the reference time from the waveform-shaped input signal; (5)
is an attenuator that adjusts the level of the input signal waveform, (6
) is a pulse shaping circuit for input signal waveform.

(7) is a measurement/display unit that calculates and displays 9 pulse widths and 9 frequencies of the gated waveform of the signal waveform-shaped by the pulse shaping circuit (6) at the main gate (4).

Next, the operation will be explained using FIG. 2 showing the states of each point (a) to (d). The waveform in Fig. 2(a) is.

This shows the basic clock generated from the reference clock (Tatsuki (1)).

FIG. 4B shows a waveform obtained by shaping the input waveform.

In addition, (C) in the same figure is a gate signal at the time specified by the reference time generator (2), and (d) is a measurement in which the waveform-shaped pulse waveform (b) is gated with the gate signal (c). It is a waveform.

Is the measured waveform (a) a total? 1lt1 - Count the number of pulses n of the measurement waveform (d) on the display section (7) and use the gate width t of the gate signal (Q) at the reference time.

f=0/l ・・・・・・・・・・・・・・・ (1)
The frequency obtained is displayed on the measurement/display section.

The conventional pulse signal measurement device has the following equation, as shown in equation (1):
Since it is averaged over the reference time (1), even if the pulse width changes in 9 cycles within the reference time (t), the change is measured. Even if the input waveform changes randomly, by adding a separate circuit to measure the pulse width and a circuit to measure the time until the secondary pulse width rises, and reading those data with a computer, The present invention provides a pulse signal measuring device that accurately measures pulse width and nine frequencies.

[Embodiment of the Invention] An embodiment of the invention will be described in detail below with reference to nine drawings. 3 is a pulse signal measuring device of the present invention, and FIG. 4 is a timing diagram at each point in FIG. 9.
In the figure, (1) is a reference oscillator that generates a basic clock, (8a) to (8b) are input waveform Hlgh,
A counter that measures the period of low level.

(9a) to (9c) are Hlgh, a measurement control circuit that generates a LOW level measurement period end timing;
(10a) to (1ab) are counters (8a) to (8
The value measured in step b) is loaded and held at the timing of the measurement end circuits (9a) to (9b), and 0υ is the program memory section where the measurement program is stored.
2 is a central processing unit that calculates and controls frequencies etc. from the data in registers (10a) to (10b); (+3 is a data memory unit (14a) that holds data measured and calculated by the central processing unit f+3; ) ~('+4b) is
A buffer for reading data held in registers (I Da) to (10b) into the central processing unit a;
I+5m, which buffers (14a) to (14
b) is a decoder that controls whether to read the data into the central processing unit (12).

Next, regarding the operation, timing waveforms (A) to (G) at each point in the block diagram shown in FIG. 3 are shown in FIGS.
Explain in detail. The waveform (a) in FIG. 4 is the basic clock generated by the basic oscillator +11. The waveform (b) is the input waveform that has been shaped, and when the input waveform is at T (high level), the number of clocks indicated by the waveform (c) is counted by the counter (8a).
When the counter (8b) starts operating.

At the rising edge of the waveform (G), the value of the counter (8a) is loaded into the register (9a), and at the same time the counter (8a)
"θ" is loaded into the central processing unit +12 to notify the end of input waveform H1gh level measurement.

Next, in order to measure the LOW level of the input waveform, the measurement/control circuit (9C) measures the number of clocks of the H1gh level of the inverted waveform (E). During this LOW level determination, the central processing unit r112, which is controlled by the program memory unit (lυ), transfers the H1gh level data to the decoder ttS.
The contents of the register (IQa) are transferred to the buffer (1
4a), the data is stored in the data memory part 113.

As in the measurement of the H1gh level, in the measurement of the Low level, as shown in (f), the counter (8b) counts the number of clocks at the H1gh level in (e), and then the counter (8a) starts operating. When the waveform of (in) is loaded, the 1st shift of the counter (8b) is loaded into the register (10b), "0" is loaded into the counter (10b) to measure the IJOW level of the 9th order input waveform, and the central processing unit 112 is notified of the end of input waveform low level measurement.

Similar to the H1gh level measurement data, this Lovr level measurement data is processed by processing the Low level measurement data during the High level measurement using a central processing unit (one unit is a decoder) controlled by the program memory unit (11). Then, the contents of the register (1ob) are stored in the data memory section (13) from the buffer (14b).

Furthermore, by changing the program in the program memory section, it is possible to easily change whether all input waveform characteristics are to be stored or whether only a different pulse width, one frequency, etc. are to be stored.

[Effects of the Invention] As described above, in the IC and the pulse signal measuring device according to the present invention, while measuring the H1gh level of the input waveform, processing the Low level data and measuring the Low level.

By processing the H1gh level data, it is possible to measure the pulse width and frequency even if the input waveform changes randomly.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing a conventional pulse signal measuring device, FIG. 2 is a timing diagram at each point in FIG. 1, FIG. 3 is a block diagram showing a pulse signal measuring device of the present invention, and FIG. The figure is a timing diagram at each point in FIG. 3. In the figure, (1) is a reference oscillator, (2) is a reference time generator, (3) is a gate control unit, (4) is a main gate,
(5) is an attenuator, (6) is a pulse shaping circuit, (7
) is the measurement/display unit 1 (8a), (8b) is the counter (9a), (9b), (9c) is the measurement control circuit, (10a), (10b) is the register, (n
) is a program memory section, (12 is a central processing unit, opposite is a data memory section, (14a) and (14b) are buffers, and (1 is a decoder.) Note that the same or equivalent parts in Figure 9 are the same. It is indicated with a code. Agent Masuo Oiwa

Claims (1)

[Claims] A reference oscillator as a basic time, a reference time generator that generates a predetermined measurement time, a pulse shaping circuit that converts the input waveform into pulses, a main gate that passes the pulse waveform only during the measurement time, and the main gate. Measurement and display that measure and display the pulse width and 9 frequencies of the input waveform from the passed pulses.
In the pulse signal measuring device that measures the pulse width and one frequency of the input waveform, the pulse signal measuring device is configured to include a display section and a counter that separately measures the high and low levels of the input waveform, thereby: A pulse signal measuring device characterized in that the pulse width and frequency of the input waveform can be measured even if the input waveform changes randomly.