JPS5920874A - Ppi-scope - Google Patents

Abstract

PURPOSE:To achieve an easy and accurate reading of the azimuth of a bearing line off-centered in a polar coordinate deflector by numerically displaying a set digital azimuth converted into a display code. CONSTITUTION:Any one of a digital azimuth outputted from an electronic digital azimuth generator 12 and an antenna azimuth digital valve from digital converter 11 is selected with a digital signal switch device 13 to control diflection coils 19a and 19b through sine/cosine generator 14 or the like and a bearing line 9 of the set azimuth is displayed off-centered on a polar coordinate deflection PPI-scope 7. The output of the generator 12 is converted into a code with a binary/BC converter 20 and the aximuth of the bearing line 9 is displayed in digital number on an LED angle indicator 22 thereby enabling an easy and accurate reading of the azimuth.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a PPI display device that displays images on a screen by sweeping an electron beam using a polar coordinate deflection method (PPI method).

Conventionally, P P used to display information on radar, sonar, etc.
As the I display device M, there is one shown in FIG. 1, for example.

In Fig. 1, ■ is an antenna angle transmitter, which usually uses a resolver etc. to generate a sine (
Generates sin θ1) and cosine (cos θ1) signals a). 2 is an electronic azimuth transmitter that transmits a setting azimuth signal for the force position line displayed on the C) t 1' screen, and a sine (
sin θ, ) and cosine (cos θ2), usually
A resolver or a sine/cosine function generating potentiometer is used.

The respective outputs of the antenna angle transmitter 1 and the electronic direction transmitter 2 are input to the signal switch 3. The sine and cosine signals of either one of the azimuth transmitters 2 are selected and supplied to the sweep signal generator 4.

A sweep signal generator 4 integrates each of the sine and cosine signals as DC voltage signals supplied from the signal switch 3 and converts them into a sweep signal that changes in a sawtooth shape, and converts the signal into a sweep signal that changes in a sawtooth shape.
The deflection current amplified by the sweep current amplifier 5 is passed through the orthogonal deflection coils 6a and 6b of the C-T, and the image of radar, sonar, etc. or the set azimuth line is displayed in PPI by polar coordinate deflection of the electron beam. .

On the other hand, the sweep signal generator 4 receives an off-center control signal in the X-axis direction (horizontal direction) and an off-center control signal in the Y-axis direction (vertical direction) from the outside.
An off-center control signal is provided, and an off-center function is provided in which each sweep starting point of the antenna angle sweep signal or the azimuth line sweep signal can be independently moved to any position on the crt'r screen. In other words, the antenna information and The sweep starting point of the azimuth line can be determined independently and arbitrarily.

By the way, in such a conventional PPI display device, in order to be able to see the directional angle θ2 of the azimuth line displayed in an arbitrary direction based on the output signal of the electronic azimuth transmitter 2, for example, as shown in FIG. Al+C As shown, a scale plate 8 indicating the azimuth angle is provided around the C117 screen 7, so that the azimuth angle θ2 can be easily determined from the indicated position of the azimuth line 9.

However, if the off-center control signal to the sweep signal generator 4 causes the off-center display to be displayed at 5 as shown in Figure 2 (13), the angle seen from the center of the scale & 8 or CIt i'' screen 7 and the origin 0. To scale (・to measure,
The scale indication by point yiiiB ahead of the azimuth line 9 from the off-centered point P will no longer indicate the correct azimuth angle.

Therefore, in the conventional I) P1 display device, an azimuth line 9' shown by a broken line parallel to the azimuth line 9 from the off-center point P is generated from the origin 0 in a pseudo manner, and a point A, which is the tip of the azimuth line 9', is generated in a pseudo manner from the origin 0. The azimuth angle of the azimuth line 9 is read when the azimuth line is off-centered from the scale indication, and reading the azimuth angle of the azimuth line when the azimuth line is off-center is complicated, and the azimuth line 9' is displayed in a pseudo manner in order to read the azimuth angle. CR from doing
This was extremely inconvenient because visibility of the T-image was obstructed.

The present invention has been made in view of these conventional problems, and uses a polar coordinate deflection method to sweep an electron beam across a round CR'l' screen to display information. By digitally generating an azimuth signal for displaying the line and converting the digital azimuth signal into a display code, the azimuth angle of the azimuth line set on or near the t'r screen is numerically displayed. This makes it possible to easily and easily read the angle of the azimuth line in the case of an off-center position.
1 display device.

The present invention will be explained below based on the drawings.

Figure 3 is a 70 block diagram showing an embodiment of the present invention.

First, the configuration will be explained. Reference numeral 10 denotes an antenna angle transmitter, and a transmitter such as a synchro transmitter or a shaft encoder (angle encoder) is used, for example. 11 is a digital converter that converts the signal corresponding to the antenna angle from the antenna angle transmitter into a binary digital angle signal. If the antenna angle estrus device 10 is a synchro oscillator, a synchro digital converter is used, and if the antenna angle estrus device 10 is an incremental type/yaft encoder, a pulse counter is used. The antenna power is obtained as a binary digital data.

As an example, when the digital angle signal of the antenna angle converted by this digital converter 11 is displayed using 12 signal bits, the binary angle bit and the BCD angle correspond to each other as shown in Table 1 below. have a relationship.

Table-1 As is clear from Table 1, the most significant bit a.

represents 180°, and the weight of the second bit a is reduced by half to 90'', and the 12th and least significant bit corresponds to 0.087890625°♂ In this way, the digital converter 11 The digital angle θ1 converted into a binary code is supplied to one input of the digital signal switch 13. On the other hand, 12 is an electronic converter that digitally generates the set azimuth angle of the azimuth line to be displayed on the CRT screen. This is an azimuth angle digital generator, which can be configured with a binary addition/subtraction counter, etc., and generates the desired azimuth angle by increasing or subtracting a clock pulse using an addition operation signal or a subtraction operation signal based on the azimuth power setting operation. A digital azimuth representing θ is generated as an 81 value of an addition/subtraction counter.

The digital data of the azimuth angle θ generated by the electronic azimuth angle digital generator 120 is also input to the digital converter 11 which outputs the digital angle signal of the antenna angle.
Similarly to digital data, for example, 1 shown in Table 1 above.
This becomes 2-bit binary digital data.

The output of the electronic azimuth angle digital generator 12 is simultaneously supplied to the other power of the digital signal switch 13.
A binary BCD converter 2 provided to numerically display the azimuth angle θ2 set in the electronic azimuth angle digital generator J2.
0 is also supplied.

The binary BCI) converter 20 can be configured, for example, from a F ROM memory, and uses digital data representing the set azimuth angle θ2 from the electronic azimuth angle digital generator 12 as an address signal of the PROM memory, and converts the azimuth angle The BCIJ code stored in advance at an address corresponding to digital data representing . The BCI) code representing the set azimuth angle θ2 read out from the binary/BCD converter 20 is latched at fixed time intervals by the latch circuit 21, and the L E IJ angle indicator 22 displays the angle in units of 0.1°, for example. Zunawachiooo,
The set azimuth angle θ is numerically displayed by driving display segments using LEDs, such as 359.9° from oo.

In this way, the set azimuth angle θ2 of the azimuth line is numerically displayed in real time on the angle display 22 based on the binary data from the electronic azimuth angle digital generator 12, so the operator can It becomes possible to set an arbitrary azimuth angle θ2 while looking at the display on the D angle display 22.

On the other hand, the digital data representing the antenna angle θ1 and the digital data representing the azimuth angle θ2 of the azimuth set supplied to the digital signal switch 1; Either the shift or shift of the input data is read out and supplied to the sine/cosine generator 14. The sine/cosine generator 14, as well as the binary/BCD converter 20, e.g.
The digital data of the antenna angle θ1 or the digital data of the azimuth angle θ, which are supplied from the digital signal switch 13, are stored as address data l~ in advance in correspondence with the PROMK address data. Each digital data of sine and cosine is read out by address designation using digital data from the digital signal switch 13, and sine digital data and cosine digital data are output.

Each of the sine and cosine digital data from the sine/cosine generator J4 is transferred to a digital/analog converter 15.
16, and is converted into an azolog voltage signal by digital/analog converters 15 and 16, and then supplied to a sweep signal generator 17. The sweep signal generator 17 generates a sweep signal that varies in a sawtooth manner by integrating the signal voltages proportional to the sine and cosine supplied from the digital-to-analog transformers 15 and 16, and after amplifying the current with the sweep current amplifier 1B, it A deflection current is supplied to each of the orthogonal deflection coils 19a and 19b of C11'I'', and information based on the antenna angle θ or an azimuth line based on the set azimuth angle θ2 is displayed by sweeping the deflection of the electron beam on the C11'I'' screen.

Furthermore, an off-center control signal in the X-axis direction (horizontal direction) and an off-sensor control signal in the Y-axis direction (vertical direction) are simultaneously supplied to the sweep signal generator 17 from the outside. Allows each of the signal origin points to be moved independently to any position
There is.

Next, the present invention will be described in detail with reference to FIG.

As the antenna of a radar, sonar, etc. rotates, the antenna angle transmitter 10 transmits an antenna angle signal that changes according to the antenna rotation angle, and based on the antenna angle signal, the digital converter 11 converts binary digital data a.
, ~a12 are output to the digital signal switch 13.

On the other hand, in response to the setting operation by the operator to set the azimuth line in an arbitrary direction, the addition operation signal or subtraction signal to the electronic azimuth angle digital generator 12, and the operation signal change the numerical value of The binary digital data of the azimuth angle θ2 set in the electronic azimuth angle digital generator 12 is given to the binary/BCD converter 20 as an address take,
The BCl) code corresponding to the address take is read out, latched in the latch circuit 21 at regular intervals, and numerically displayed on the LED angle display 22.
Set any azimuth angle by looking at the numerical display.

The set azimuth angle θ of the azimuth line set in the electronic azimuth angle digital generator 12 in this way is supplied to the digital signal switch 13 as binary digital data, and the digital signal switch 13 is switched to the digital signal switch 13 according to a switching control signal supplied from the outside. The digital azimuth signal from the -electronic azimuth angle digital generator 12 is supplied to the sine/cosine generator 14, and the digital data from the digital signal switch is written into the Pit OM as address data. Sine data and cosine data corresponding to the antenna angle θ1 or azimuth angle θ2 are read out, converted into analog voltage signals by digital/analog converters 15 and 16, and supplied to the sweep signal generator 17. At this time, the X-axis and Y-axis off-center control signals supplied from the outside to the sweep signal generator 17 are transmitted to the CRT II! ! i
Assuming that the control signal has the origin 1, which is the center of the surface, as the sweep reference point, the sweep signal generator 517 provides a sweep signal that changes in a sawtooth shape by integrating sine and cosine voltage signals, etc. to the sweep current amplifier 8. By current amplifying each sweep signal and passing a deflection current through the orthogonal deflection coils 19a and 19b, information starting from the center of the CK1 screen 7 can be displayed, for example, as shown in FIG. Azimuth angle θ2 of the azimuth line set in the azimuth angle digital generator 12
2299.9°, this set azimuth angle θ.

A direction line 9 is displayed from the origin 0 in the direction of , and CltT
L E Ll angle indicator 22 provided near the screen 7
The set force angle θ, =299.9° is displayed numerically.

Next, the X-axis and Y-axis are input to the sweep signal generator 17 from the outside.
If the axis is centered at point P as shown in Figure 4 (Bl) by the axis off-center control signal, the off-center
From the point, draw the azimuth line 9 in the direction of the set azimuth angle θ, = 299.9°
is displayed, and L near the display screen of the CRT screen 7 is displayed.
The azimuth angle θ of the azimuth line 9 is numerically displayed on the ED angle display 22.

Therefore, as shown in Fig. 4 () 3), in the case of off-center, it becomes impossible to read the correct azimuth θ2 depending on the scale plate 8 provided on the outer periphery of the CR1 screen 7, but the CK
1) Since the azimuth angle θ22299.9° of the azimuth line 9 is numerically displayed on the L E l) angle display 22 provided near the screen 7, by looking at this angle display 22, you can easily determine if the position is off-center. The azimuth angle of the azimuth line 9 at .

FIG. 5 is a block diagram showing another embodiment of the present invention. The only differences between this embodiment and the embodiment of FIG. 3 are the digital sweep signal generator at 23 and the digital-to-analog converters at 24 and 25.

In FIG. 5, the digital sweep signal generator 23 is a sine/
The cosine generator 14 also has a function of digitally integrating the output digital data of the antenna angle θ or the sine digital data and cosine digital data corresponding to the digital cheater of the digital azimuth θ2. That is, the input sine digital cheater and cosine digital data are multiplied by $ at regular intervals and outputted. As a concrete explanation, ℃・-1l
'First, at the timing of ゛1゛1, sine digital cheetah
, this value is memorized and Xl is output as it is. At the next 'l゛2 timing, the difference between the data input this time (Xl = Xl) and the previous stored value X is calculated. Phase x
2+X,=2·Xl (Xt =X+) and outputs this value.

At the next timing of 1゛, the data input this time
(However, Xs ”X2”Xl) Previous memory value X
, 10X, +X, ==3・X, and outputs this value.

Repeat this action below. The same applies to the cosine digital data Y.

Furthermore, since X-axis and YN on-center control signals are externally applied to this digital sweep signal generator 23,
In the case of an off-center display as shown in Figure 4 (FB), digital data values corresponding to the X-axis and Y-axis off-center are algebraically added to each of the cumulative addition values of the sine and cosine digital cheaters mentioned above, and this total value is calculated. I am trying to output it.

The next digital-to-analog converters 24 and 25 convert the cumulative additive values of the sine and cosine digital data, which are the two outputs of the digital sweep signal generator 230, including the offset value, into analog voltages, and output the offset. A value-added sawtooth voltage is obtained. These two outputs are respectively applied to a sweep current amplifier 8 and the output signals of the sine/cosine generators 14 are each first converted to an analog signal and then integrated in an analog manner to produce a sawtooth signal. In contrast, in the embodiment of FIG. 5, the output signal of the sine/cosine generator 14 is first digitally integrated and then converted into an analog signal. The advantage of the embodiment shown in FIG. 5 is that factors that degrade accuracy, such as nonlinear distortion and temperature drift, which normally occur in the analog integrator of the embodiment shown in FIG. 3, can be eliminated. In other words, in the digital integration word-1 calculation, if the number of bits of the digital decoupling is provided as much as necessary for the division accuracy, theoretically non-linear distortion, temperature drift, etc. cannot occur. It is from. The embodiment shown in FIG. 5 has functions with higher precision and stability (with respect to temperature) than the embodiment shown in FIG. 3 even though the operation is the same.

Further, in the PPI display device of the present invention, generation of an antenna angle signal, setting of an azimuth pure angle signal for displaying an azimuth line, and furthermore, generation of an antenna angle signal, setting of an azimuth pure angle signal for displaying an azimuth line angle signal, and furthermore, The sine and cosine signals are all generated by digital processing and filtered by °C, and extremely high accuracy can be achieved by setting the number of binary bits of each angle data to 12 bits, for example, as shown in Table 1 above. Furthermore, compared to the conventional analog processing shown in FIG. 1, the performance is stable because it is not affected by temperature, and the cost can be reduced. Further, in the above embodiment, the FROM memory was used to perform BCD conversion and sine/cosine data generation, but the digital processing of the present invention is not limited to this, and may include program calculation control by a microprocessor and other digital operations. Of course, you may also use a container.

Furthermore, in the above embodiment, the numerical display of the setting angle of the azimuth line is C.
Although the angle table provided near the RT screen is clumsily displayed (Z), as another example, the set angle of the azimuth line may be displayed numerically in the empty space on both sides of C1. good.

As explained above, according to the present invention, information is displayed by sweeping the deuteron beam across one screen of the round CLT using the polar coordinate deflection method. In addition to digitally generating the set azimuth angle signal for the azimuth angle, the digital azimuth angle signal is converted into a display code and the set azimuth angle of the azimuth line is displayed numerically on or near the CIt 1 screen. The setting of the azimuth line (111 degrees) when displaying information off-center can be easily and easily determined by setting the azimuth line of 111 degrees on the angle display.
When setting the azimuth line by zooming to the T screen, the setting angle of the azimuth line is numerically displayed in real time, so the effect of making the azimuth line setting operation extremely easy can be obtained. In addition, in the PPI display device of the present invention, since the sine and cosine signals for generating the antenna angle azimuth line setting angle and the sweep signal are realized by digital processing, the number of pits in the binary daisicle data can be reduced. By increasing the signal processing accuracy, the accuracy of signal processing can be greatly improved compared to conventional analog processing methods. Also, unlike conventional analog methods, stability can be improved as it is not affected by temperature. Since it is possible to utilize digital arithmetic elements, it is also possible to achieve the effect that costs can be significantly reduced.

[Brief explanation of the drawing]

Fig. 1 is a block diagram showing an example of a conventional device, Fig. 2 is an explanatory diagram showing direction line display by the conventional device, Fig. 3 is a prosock diagram showing an embodiment of the present invention, and Fig. 4 is An explanatory diagram showing a direction line display and a direction line angle display according to the present invention,
FIG. 5 is a block diagram showing another embodiment of the present invention. 7...CRT screen 8...Scale plate 9...Azimuth line 10...Antenna angle transmitter 11...Digital converter 12...Electronic azimuth angle digital generator 13...Digital signal switch 14... Sine/sine generator 15.16, 24.25... Digital/analog converter 17... Sweep signal generator 18... Sweep current amplifier 19a, 19b... Deflection coil 20 ...Binary/BCD converter 21...Latch circuit 22...LED angle indicator 23...Digital sweep signal generator (A) Diagram (B) Procedure Sleeve correction (spontaneous)
5. August 27, 1981 Kazuo Wakasugi, Director General of the Special JT Agency 1, Display of ■) 6
・1981 Patent Gen'1 No. 131711 2, Name of the invention PP Engineering Indication Shameful 3 Relationship with the person making the amendment 12th Street 16 or 46 Name (3
38) Tokyo Gen 1 Co., Ltd.? , ■4 Deputy Director Address: 105 II Address: 3-15 Nishishinzai, Minato-ku, Tokyo No. 8 Nishishin 4-
Le Chuo Building 4; 1 ``1Moni 1i03 (432) 1007 Claims of the specification to be amended and detailed explanation of the invention 6 Contents of the amendment (1) Patent iT of the specification !Correct the description of the desired range according to the printing part. (2) Correct the "previous memory value" in the fourth line of page 18 of the specification to "sum of previous record 11mX2+Xt". Attachment 1 2. Claims In a PP■ display device that displays information by sweeping an electron beam across a round CRT screen using the horizontal i+=direction method, displaying information on the CR1 screen in response to an arbitrary azimuth setting operation. A digital azimuth signal that digitally generates the set azimuth angle of the azimuth line to be set, and a digital azimuth signal generated by the digital azimuth transmitter are converted into display 21 ~ signals and displayed as numerical values on or near the CR1 screen. An azimuth angle display means for displaying; an antenna angle transmitter that generates an antenna angle signal; a digital angle converter that converts the antenna angle signal from the antenna angle transmitter into a digital angle signal; and the digital azimuth angle transmitter. A signal switch that selects the output of the digital angle converter according to the set timing, and a sine corresponding to the digital angle signal or idigital angle I selected by the signal switch. and a sine/cosine generator that generates an output signal of sine/cosine and a sweep signal for the angle of the angle proportional to the output signal of the sine/cosine generator. a sweep signal generator that varies the origin position of the CRT using an external signal; and a current amplifier that supplies a deflection current to the orthogonal deflection coil of the CRT by current amplification proportional to the output signal of the sweep signal generator. 1] P1 display device.

Claims (1)

[Claims] In a PPI display device that displays information by sweeping an electron beam across a round CR'I' screen using a polar coordinate deflection method, information is displayed on the CRT screen in response to an arbitrary azimuth setting operation. A digital azimuth angle transmitter that digitally generates the set azimuth angle of the azimuth line, and a digital azimuth angle signal generated by the digital azimuth angle transmitter that is converted into a display code signal and then IM CI't T
An azimuth angle display means for displaying numerical values on or near the screen; an antenna angle speaker for generating an antenna angle signal; and a digital angle converter for converting the antenna angle No. 46 from the antenna angle transmitter into a digital angle signal. and a signal switch that selects the output of the digital azimuth transmitter and the output of the digital angle converter according to a set timing, and a sine signal corresponding to the digital angle signal or digital azimuth signal selected by the signal switch. and a sine/cosine generator that generates a signal voltage of cosine and a sine/cosine generator, and generates an antenna angle sweep signal or azimuth line sweep signal proportional to the output signal of the sine/cosine generator, and externally determines the origin position of each sweep signal. A PPI comprising: a sweep signal generator that is variable depending on a signal; and a current amplifier that supplies a deflection current to the orthogonal deflection coil of the CI-LT by amplifying a current proportional to the output signal of the sweep signal generator. Display device.