JPS6375684A - Radio azimuth display apparatus - Google Patents

Abstract

PURPOSE:To prevent the disappearance of a desired radio wave and the collapse of a wave form and to rapidly alter the indication of an arrival azimuth, by applying change-over control to the gain of a receiver on the basis of the output of a comparator when an antenna azimuth through a goniometer is present in the set arrival azimuth range corresponding to the position of a cursor. CONSTITUTION:A radio wave arrival range is set to an arrival azimuth setting device 20 corresponding to the cursor position of an indicator 13 due to a cursor generator 15. When the antenna azimuth information from a goniometer 11b and a counter 18 is present in said range, a switch circuit 17 is changed over by the coincidence output from a comparator 19 and the gain of a receiver 12 is converted from the low gain based on a reference voltage generator 16 to become high by AGC through a detector 14 and the jamming due to the receiving radio wave from the outside of the set range is prevented and the disappearance of a desired azimuth radio wave or the collapse of a wave form is prevented. The alteration of the indication of an arrival azimuth is easily and rapidly performed by the alteration of the cursor position.

Description

[Detailed Description of the Invention] [Objective of the Invention] (Industrial Application Field) This invention provides a method for achieving a desired azimuth width with a constant azimuth width centered at a cursor position.
To make it possible to distinguish the desired radio wave from other arriving radio waves at the same frequency as the arrival range of the wave, to make it possible to clearly display the desired radio wave, and to roughly link the casa and the arrival range of the desired radio wave. The present invention relates to a wireless direction display device that can change the arrival range in synchronization with the movement of a casa.

(Prior Art) In a conventional wireless direction display device, a receiver receives incoming radio waves through an antenna system having rotational directivity, extracts a direction indicating pattern from the intermediate frequency stage, and sends it to a cathode ray tube type indicator. Using the azimuth indicating signal that receives the azimuth output from the same antenna system, that is, the 239 pulse and the azimuth count pulse, the indicator displays the azimuth indicating waveform as shown in FIG.

In Figure 3, the circumference is 360° per goniometer rotation.
In the figure, C is a cursor that indicates the direction of the desired incoming radio wave. In the instruction waveform, part a is the desired wave, and part b is the interference wave.

At this time, the cursor of the indicator is used simply to read the scale.

(Problem to be Solved by the Invention) However, in the conventional wireless direction display device as described above, signals in all directions are displayed at the same input signal level, so as shown in FIG. If there is a radio wave other than the desired incoming radio wave (jamming radio wave), this will also be displayed at the same time, and if the level of the interfering radio wave is high and the desired radio wave is weak, the automatic gain adjustment of receiver 1 will cause the radio wave to be displayed as indicated by the dotted line in the middle of Figure 3. This results in a waveform like the one shown below, making it difficult to identify. Furthermore, even if the radio waves are particularly weak, if there are radio waves coming from multiple directions, these will be displayed simultaneously, which not only distorts the displayed waveform and makes it difficult for children to see, but also increases azimuth errors.

This invention was made in order to improve the above-mentioned problems, and can prevent the disappearance of desired radio waves and the collapse of waveforms, thereby clearly displaying waveforms, and specifying the direction of arrival using a rough cursor. An object of the present invention is to provide a wireless direction display device that can quickly change the direction.

[Structure of the Invention (Means for Solving Problems) A wireless direction display device according to the present invention includes an antenna system having rotational directivity including a plurality of antennas and goniometers, and a signal output from the antenna system. a receiver that receives and outputs an azimuth indication pattern according to the rotation angle of the goniometer; a detector that detects the output of the receiver and generates an automatic gain control signal; and a criterion for minimizing the gain of the receiver 1. a reference voltage generator that generates a voltage, an arrival direction setting device that sets a predetermined azimuth range centered on the cursor position as an arrival range of a desired radio wave, and an azimuth display signal output from the goniometer and the arrival direction setting device. A comparator that generates an output when the direction of the direction display signal is within the set direction range by comparing the direction with the set range; gain control means for supplying the output of the wave detector to a receiver to control its gain; an indicator for indicating an azimuth indication pattern output from the receiver; and a cursor generator for generating a cursor in the indicator. It consists of a container.

<Function> The radio direction display device with the above configuration operates the automatic gain control of the receiving port in normal mode only within a predetermined width range centered on the displayed casa, and the receiver controls the radio waves outside of that range. The gain of the radio wave is minimized and attenuated, thereby preventing the desired radio wave from disappearing and preventing the waveform from being disturbed. Here, by changing the cursor position with the cursor generator, the set direction of the direction of arrival setter changes, and the designation of the direction of arrival is quickly changed.

(Embodiment) An embodiment of the present invention will be described below with reference to FIGS. 1 and 2.

FIG. 1 shows its configuration. An antenna system 11 of this radio direction display device is composed of a plurality of antennas 11a and a goniometer 11b, and has rotational directivity. The goniometer 11b sends an excitation signal by an incoming radio wave to the receiver 12 according to the rotation angle, and also generates a reference pulse P1 and an azimuth count pulse P2. Receiver 12 is antenna system 1
1 receives incoming radio waves, and applies AGC (
After applying automatic gain control (il), an azimuth instruction pattern (IF (intermediate frequency)) according to the rotation angle of the goniometer 11b is applied.
This direction indicating pattern is sent to the indicator 13 and also to the detector 14.

The indicator 13 displays an azimuth instruction waveform based on an azimuth instruction pattern based on the reference pulse P1 and the azimuth count pulse P2, and further displays a cursor based on a cursor position signal generated by the cursor generator 15.

The detector 14 level-detects the IF output of the receiver 12, and based on the detected level, the
It generates GCffi pressure. The AGC output of this detector 14 is selectively applied to the receiver 12 by a switch circuit 17 together with the reference voltage output from the reference N pressure generator 16.
supplied to The reference voltage generator 16 generates an AGC voltage that minimizes the gain of the receiver 12.

The reference pulse P1 and the azimuth pulses P1 to P2 are counted by a counter 18, and the count output is sent to a comparator 19. This comparator 19
The arrival direction setter 20 compares the arrival node number set based on the cursor position with the counter output, and provides a switching control signal to the controller 21 in accordance with the comparison result.

The operation of the above configuration will be explained below.

When the cursor generator 15 is adjusted to set the cursor position, the arrival direction setting device 20 reads this and sets the arrival range, and the count numbers (directions) at the start and end of that range are sent to the comparator 19. On the other hand, the reference pulse P1 and the azimuth count pulse P2 outputted from the antenna system 11 are counted by a counter 18, and the count value is sent to a comparator 19.

The comparator 19 constantly compares the arrival range and the count value of the counter 18, and outputs a switching control signal to the controller 17 at the start and end of the arrival range. The controller 21 switches the switch circuit 17 every time the switching control signal is input, and when it is out of the arrival range, the W! The output of the quasi-voltage generator 16 is sent to the receiver 12, and the output of the wave detector 14 is sent to the receiver 12 within the arrival range.
control to send to.

With this operation, the receiver 12 minimizes the gain for signals outside the arrival range, and performs gain adjustment by normal AGC for signals within the arrival range. Therefore, at the input of the indicator 13, the signal level within the arrival range centered on the cursor is high, the signal outside the arrival range is sufficiently attenuated, and the desired radio wave is clearly displayed on the display. Furthermore, when the position of the cursor generated from the cursor generator 15 is manually changed, the moved cursor position is instantaneously input to the direction of arrival setter 20, the arrival range is set, and the AGC of the receiver 12 is adjusted accordingly. A switch is made.

Therefore, you can freely specify the direction just by moving the casa, and you can clearly display radio waves in all directions without spending time on settings.

For example, as shown in FIG. 2, when the cursor is at position A on the display of the indicator 13, the C-A-D range is within the arrival range, normal AGC is performed, and C-F- B-E-D
is outside the arrival range, and the amount of attenuation is maximum. Also, if you move the casa to position B, F-B-E
Normal AGC is performed within the arrival range, and E-D-
The amount of attenuation is maximum when A-CF is outside the arrival range.

Therefore, the radio direction display device configured as described above can clearly display a desired radio wave even if there is a radio wave of the same frequency outside the arrival range of the desired radio wave by switching the AGC of the receiver 1. Furthermore, since the designation of the arrival range of a desired radio wave is linked to the cursor position, the arrival range can be easily changed in a short time, and is extremely effective in searching for radio waves whose direction of arrival is unknown.

[Effects of the Invention 1 As described above, according to the present invention, it is possible to prevent the disappearance of desired radio waves and the collapse of waveforms, thereby displaying the waveforms clearly and quickly specifying the direction of arrival using the rough cursor. A wireless orientation display device that can be changed can be provided.

[Brief explanation of the drawing]

Fig. 1 is a block circuit diagram showing an embodiment of the wireless direction display device according to the present invention, Fig. 2 is a diagram for explaining the arrival range due to a cursor change of the same embodiment, and Fig. 3 is an indication of the conventional device. It is a figure which shows the comparison with the example of a device display. 11... Antenna system, lla... Antenna, 11b
... Goniometer, 12... Receiving compensation, 13... Indicator, 14... Detector, 15... Cursor generator, 1
6... Reference voltage generator, 17... Switch circuit, 1
8...Counter, 19...Comparator, 20...
- Arrival direction setting device, 21... Controller, Pl... Reference pulse, ゛... Direction count pulse.

Claims (1)

[Claims] An antenna system comprising a plurality of antennas and goniometers and having rotational directivity; a receiver that receives signals output from the antenna system and outputs a direction indicating pattern according to the rotation angle of the goniometer; and an output of the receiver. a reference voltage generator that generates a reference voltage that minimizes the gain of the receiver; and a reference voltage generator that generates a reference voltage that minimizes the gain of the receiver; A direction display signal outputted from the goniometer is compared with a range set by the direction of arrival setter, and when the direction of the direction display signal is within the set direction range, the direction display signal is output. a gain control means for supplying the output of the detector to a receiver to control its gain when the output of the antenna system is within the arrival range based on the output of the comparator; and an output from the receiver. A wireless direction display device comprising: an indicator that indicates an azimuth instruction pattern to be displayed; and a cursor generator that generates a cursor on the indicator.