JPH03259754A - Frequency measuring device - Google Patents

Abstract

PURPOSE:To remove an information of erroneous measuring frequencies at the time when more than two waves are inputted simultaneously, by giving a level difference forcedly to two waves inputted at the same time and utilizing the fact that the frequency measuring value is different from a value in the case the level difference is not given. CONSTITUTION:Input signals are distributed by a distribution device 1 and one of the outputs is inputted to an IFM(instantaneous frequency measurement) receiver 3a direct. A second output is inputted to an IFM receiver 3b passing through a filter 2. By the filter 2 at this time, the level difference is given to the inputs having different frequencies by making forcedly to have frequency characteristics. By a third output, the signal input is detected with a trigger circuit 4 to supply a measurement timing to two receivers 3a, 3b at the same time. The measured data of two receivers 3a, 3b are compared by the timing from a comparator 5 for frequency measuring values, and when the values are different, two waves are considered as inputting at the same time, then the data are disregarded.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a frequency measuring device, and in particular to an IFM (Instantaneous device) that monitors frequencies over a wide band.
(Frequency Measurement) This relates to the removal of frequency measurement errors when two waves are simultaneously input in a receiver.

[Conventional technology]

FIG.
MES BAO-YEN TSUI ”MTCROWA
VE RECEIVER3WITI(ELE(1,T
RICWARFARE APPLICAT1ONS''
185), in which 1 is a distributor, 6 is a delay line, 7 is a phase discriminator, 8 is a detector, and 9 is a differential amplifier.

Next, the operation will be explained. One of the high-frequency signals distributed by the distributor 1 is sent as is, and the other is sent to the delay line 6.
through the phase discriminator 7. A phase difference is detected by a detector 8 and a differential amplifier 9. Since the detected phase difference is a function of frequency, the frequency can be measured by performing calculations on the phase difference.

[Problem to be solved by the invention]

Since the conventional frequency measuring device is configured as described above, there is a problem in that when two or more signals are input at the same time, the phase difference information becomes abnormal, resulting in erroneous measurements.

The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide a frequency measuring device that can remove erroneously measured frequency information when two or more waves are simultaneously input.

[Means to solve the problem]

The frequency measurement device according to the present invention forcibly increases the level difference between two waves input at the same time, and removes erroneous measurement values by utilizing the fact that the frequency measurement value is different from the frequency measurement value when the level difference is not increased. It was designed to do so.

[Effect]

In this invention, the filtering means acts to forcibly add a signal level frequency characteristic to the signal within the measurement frequency bandwidth.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings.

In Figure 1, 1 is a distributor, 2 is a filter, 3a 3
b is an IFM receiver, 4 is a trigger circuit, and 5 is a frequency measurement value comparator.

Next, the operation will be explained. The input signal is divided by the distributor 1, and one output is directly input to the IFM receiver 3a. The second output passes through the filter 2 and is input to the IFM receiver 3b. Here, this filter 2 is forcibly given a frequency characteristic as shown in FIG. 2, and a level difference is created for inputs of different frequencies.

The third output detects the signal input in the trigger circuit 4, and simultaneously provides measurement timing to the two IFM receivers i3a and 3b. The measurement data of the two IFM receivers are compared at the timing from the frequency measurement value comparator 5, and if the values are different, it is regarded as simultaneous two-wave input and the data is ignored.

In the above embodiment, two IFM receivers are used, but as shown in FIG. 7
It may be configured such that the human power applied to the IFM receiver 3 is changed at , and the frequency is measured twice, once passing through the filter 2 and once not passing through the filter 2, and the same effect as in the above embodiment can be obtained.

〔Effect of the invention〕

As described above, according to the present invention, by forcibly creating a level difference for two waves that are input at the same time, and by utilizing the fact that the frequency measurement value is different from the frequency measurement value when no level difference is created, the simultaneous Since the structure is configured to remove erroneous measurement values when inputting two waves, a frequency measuring device without erroneous measurements can be obtained.

[Brief explanation of drawings]

Fig. 1 is a diagram showing a frequency measuring device according to an embodiment of the present invention, Fig. 2 is a diagram showing the frequency characteristics of the wave generator according to the above embodiment, and Fig. 3 is a diagram showing frequency measurement according to another embodiment of the invention. FIG. 4 is a diagram showing a conventional frequency measuring device, but does not show the conventional frequency measuring device. 1 is a distributor, 2 is a filter, 3 is an IFM receiver, 4 is a trigger circuit, 5 is a frequency measurement value comparator, 6 is a delay line, 7 is a phase discriminator, 8 is a wave detector, 9 is a differential amplifier It is. Note that the same reference numerals in the figures indicate the same or equivalent parts. Procedural Order Postal Code E ((spontaneous) Indication of the case 5, column for detailed explanation of the invention in the specification subject to amendment, and drawings (Figures 1 and 3) 6. Contents of the amendment (1) Description Delete "Timing from" on page 4, line 13. (2) Correct the figures 1 and 3 as shown in the attached sheet. Relationship with the case involving the person who filed the patent application Address: 2-2-3 Marunouchi, Chiyoda-ku, Tokyo Name (601) Moriya Shiki, Representative of Mitsubishi Electric Corporation

Claims (1)

[Claims] (1) A device for measuring the frequency of a high-frequency signal, which includes means for distributing an input signal, a filtering means for creating a level difference in frequency with respect to one output of the distributing means, and the filtering means and the distributing means. A frequency measuring device comprising: means for measuring the frequency of each of the other outputs; means for comparing the measurement results of these frequency measuring means; and means for giving measurement timing to the frequency measuring means. .