JPH02150133A - Supervisory receiver - Google Patents

Abstract

PURPOSE:To make a supervisory area into a wide band area, high speed, and high resolution by providing a sweep receiver operated in the wide band area and at high speed, and a narrow-band receiver having the high resolution. CONSTITUTION:A supervisory receiver is constituted by providing the sweep receiver 14 whose frequency is swept, and the narrow-band receiver 15 in parallel. A filter 4 is selected in the wide band area at the sweep receiver 14, and a local oscillator 7 performs frequency sweep at high speed, however, no high resolution is obtained, therefore, when a frequency analyzer 8 detects an unrequired signal, the local oscillator 13 of the narrow-band receiver 15 is operated corresponding to the signal. And the oscillation signal is mixed with a reception signal from a pre-amplifier 2 at a mixer 9, and is frequency-converted, then, it is inputted to a narrow-band filter bank 10, and a desired wave signal which exists in the neighborhood of the unrequired signal is extracted, and furthermore, after it is detected by a detector group 11, identification at every frequency is performed at a frequency identifier 12. In such a way, since supervision by the narrow-band receiver is always performed only in the neighborhood of a prescribed frequency, it is possible to easily attain the high resolution in the wide band area and fast supervision.

Description

[Detailed description of the invention] [Industrial application field]

The present invention relates to a monitoring/receiving device that monitors radio waves by performing frequency sweeps.

[Conventional technology]

FIG. 3 is a block diagram showing a conventional monitoring and receiving device.
In the figure, 1 is an input terminal for a received signal containing radio waves of various frequencies received by an antenna (not shown), 2 is a preamplifier that amplifies the received signal from input terminal 1, and 7 is a frequency swept signal. A local oscillator 3 is a mixer that mixes the amplified received signal from the preamplifier 2 and the oscillation signal from the local oscillator 7 and converts the received signal to a frequency that is the difference between the two;
4 is a filter through which the frequency-converted reception signal from the mixer 3 passes; 5 is a detector for detecting the output signal of the filter 4; 6 is a frequency detector for detecting the detected output of the detector 5 based on the signal from the local oscillator 7. - A frequency analyzer that performs level analysis; 8 is an output terminal to which the frequency-level analysis results are output; Next, the operation will be explained. The received signal input to the input terminal 1 is amplified by the preamplifier 2, and the amplified received signal and the frequency-swept signal from the local oscillator 7 are mixed by the mixer 3 to undergo frequency conversion. Ru. This frequency-converted received signal is passed through filter 4,
After the band is limited, the wave is detected by the wave detector 5. The frequency analyzer 6 performs frequency-level analysis based on the level of the detection output and the timing of the frequency sweep, and outputs the analysis result to the output terminal 8.

[Problem to be solved by the invention]

Conventional monitoring/receiving equipment is configured as described above.
In order to increase the frequency resolution, it is necessary to either make the sweep time of the monitoring band extremely long or narrow the monitoring band, which causes problems such as difficulty in high-resolution and high-speed monitoring over a wide band. was there. The present invention was made to solve the above-mentioned problems, and an object of the present invention is to obtain a monitoring/receiving device that can perform high-resolution and high-speed monitoring over a wide band.

[Means to solve the problem]

The monitoring/receiving device according to the present invention is provided with a frequency-swept sweep receiver and a narrowband receiver in parallel.

[Effect]

The monitoring/receiving device according to the present invention uses a sweep receiver to monitor radio waves at high speed and in a wide band, and based on detection information of a predetermined frequency such as an unnecessary wave signal obtained from the return receiver, only the vicinity of the predetermined frequency is continuously narrowed. A band receiver monitors at high speed and distinguishes between desired wave signals and unnecessary wave signals.

【Example】

An embodiment of the present invention will be described below with reference to the drawings. 1st
In the figure, parts corresponding to those in FIG. 3 are denoted by the same reference numerals, and explanations thereof will be omitted. Reference numeral 13 denotes a local oscillator that oscillates a signal of a predetermined frequency, and when the frequency analyzer 6 detects an unnecessary wave signal consisting of unnecessary waves of a predetermined frequency, it is operated according to the detected signal. , 9 is a mixer that performs frequency conversion by mixing the amplified reception signal from the preamplifier 2 and the oscillation signal of the local oscillator 13, and 10 is a plurality of narrowband filters through which the frequency-converted reception signal is passed. 11 is a group of detectors that detect the output signal of the narrowband filter bank 10; 12 is a frequency that performs frequency identification for each detection output of the detector group 11 and outputs the identification result to the output terminal 8; It is a discriminator. Reference numeral 14 is a sweep receiver which is composed of circuits 3 to 7 and performs monitoring by high-speed sweeping in a wide band. Reference numeral 15 is a narrowband receiver which is composed of circuits 9 to 13 and which performs monitoring in a narrow band. . Next, the operation will be explained. In the sweep receiver 14,
The filter 4 is selected to have a wide band, and the local oscillator 7 sweeps the frequency at high speed. This high-speed sweep does not provide high resolution. That is, in the frequency analyzer 6, for example, if a desired wave signal consisting of a signal of a desired frequency exists in the vicinity of an unnecessary wave signal consisting of a signal of a predetermined frequency in the received radio waves, a high-speed sweep is performed. , it becomes difficult to identify the desired wave signal. When an unnecessary wave signal is detected in the frequency analyzer 6, the local oscillator 13 of the narrowband receiver 15 is operated in response to this detection signal. This oscillation signal and the received signal from the preamplifier 2 are mixed in the mixer 9, thereby converting the frequency of the received signal. By passing this frequency-converted reception signal through the narrowband filter bank 10, a desired wave signal existing near the unnecessary wave signal is extracted.After being detected by the detector group 11, the frequency discriminator 12 identified by each. This identification result is output from the output terminal 8 together with the frequency-level analysis result obtained by the frequency analyzer 6 in a wide band and high speed sweep. In the above embodiment, the case where there is only one unnecessary wave signal has been explained, but by using a plurality of narrowband receivers 15 as shown in FIG. A broadband, high-resolution, and high-speed monitoring and receiving device can be obtained. In FIG. 2, first, the sweep receiver 14 monitors at high speed and over a wide band, and detects a plurality of unnecessary wave signals therein. Based on this detection information, multiple narrowband receivers 1
5, the desired wave signal is monitored with high resolution. In addition, by replacing the local oscillator 13 with a high-speed synthesizer that switches frequencies at high speed, the sweep receiver 14
By switching the frequency for a plurality of unnecessary wave signals within the sweep time of , it is possible to monitor desired wave signals existing in the vicinity of the plurality of unnecessary wave signals.

【Effect of the invention】

As described above, according to the present invention, the configuration includes a sweep receiver that operates in a wide band and at high speed, and a narrow band receiver that has high resolution. In addition, there is no need to configure the device using multiple expensive wideband sweepers, and by using it in conjunction with an inexpensive narrowband receiver, the device can be made inexpensive and
This has the effect of being able to be made smaller.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing a monitoring and receiving device according to an embodiment of the present invention, FIG. 2 is a block diagram showing a monitoring and receiving device according to another embodiment of the invention, and FIG. 3 is a block diagram showing a conventional monitoring and receiving device. It is a block diagram. 3 is a mixer, 4 is a filter, 5 is a detector, 6 is a frequency analyzer, 7 is a local oscillator, 9 is a mixer, 10 is a narrow band filter bank, 11 is a detector group, 12 is a frequency discriminator, 1
3 is a local oscillator, 14 is a sweep receiver, and 15 is a narrowband receiver. In addition, in the figures, the same reference numerals indicate the same or equivalent parts. (2 others) Figure 3

Claims (1)

[Claims] It is configured to detect a signal in a predetermined band from a mixed signal of the received signal and the frequency swept signal, and to detect a signal in a predetermined frequency based on the signal in the predetermined band and the frequency swept signal. a sweep receiver; and a narrowband receiver configured to detect a predetermined narrowband signal from a signal obtained by mixing the received signal with a predetermined frequency signal generated in response to the detection of the predetermined frequency signal. A monitoring and receiving device equipped with.