JPH0341766B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] This invention relates to a true bearing unit that uses signals from a gyro repeater to rotate a cursor for indicating the true bearing in a radar or direction finder;
Alternatively, the present invention relates to a gyro interface used to supply the output of a gyro repeater to a north-up circuit for displaying a display so that the directly above the indicator always points to the true north direction.

``Prior art'' In conventional radars and direction finders, the indicated direction is generally set to the bow direction of the ship on which the radar or direction finder is installed, for example, as the reference direction, and the azimuth angle of the object detected by the radar is determined relative to that reference direction. It was read from the angle scale and indicated the direction to be detected by the direction finder. Therefore, the direction of the detected object and the detection direction when north is the reference direction are unknown. For this purpose, the true bearing unit places a true bearing cursor on the display screen and mechanically rotates the true bearing dial using the output from the gyro repeater, controlling the direction of the true bearing cursor so that it points north on the display screen. Alternatively, the output of the gyro repeater was supplied to the north-up circuit, and the display was rotated by the angle of the bow direction relative to true north, so that true north on the display surface always faced upward.

By the way, conventional synchro repeaters are divided into synchronized type and step type, depending on the gyro compass.
The coupling ratio differs depending on the repeater, with some repeaters rotating 360 degrees, some rotating 180 degrees, and some rotating 90 degrees or 36 degrees. Therefore, it is necessary to change the gear ratio of the gear that connects the true direction indicating cursor and the gyro repeater depending on the gyro compass and repeater used, which have different combination ratios, which is very inconvenient.

An object of the present invention is to enable the stepping motor that drives the true direction indicating cursor simply by switching a switch even if the type of gyro compass used or the coupling ratio of the gyro repeater is different; The object of the present invention is to provide a gyro interface capable of providing a gyro repeater output to a north-up circuit.

"Means for Solving the Problems" According to the present invention, the three-phase outputs from the synchro repeater are each converted into square waves by the waveform conversion circuit. The output of this waveform conversion circuit and the output of the step repeater are selected depending on whether a synchro repeater or a step repeater is used in the selector. When the state of one of the three selected outputs (three-phase outputs) from the selector changes, a pulse is generated by the state change detector.
One pulse from this state change detector is output as either 10 pulses, 20 pulses, or 100 pulses by the multiplication means. The multiplication means is provided with a first switch means, and the first switch means is set according to the coupling ratio of the gyro repeater using the first switch means to output one of the 10 times pulse, 20 times pulse, and 100 times pulse. . The output pulse of this multiplication means is divided into 1/6 or 1/3 by the frequency dividing means and outputted. The frequency dividing means also includes a second switch, which is set by the coupling ratio of the gyro repeater. The output pulse of the frequency dividing means is supplied, for example, to a driving circuit of a stepping motor for rotating the true direction indicating cursor, and the true direction indicating cursor is rotationally driven.

If the polarity of the rotation is also controlled, the direction of the gyro compass can be increased by comparing the changing states of the three outputs of the selector, that is, the states of the three outputs before and after the one output changes. The rotation direction of the stepping motor of the true direction indicating cursor is controlled in accordance with the result of this determination. Alternatively, the output pulse of the frequency dividing means and the polarity signal for changing the azimuth are supplied to the north-up circuit, thereby making it possible to display the north-up display by shifting the display by, for example, an angle relative to the north of the heading of the ship.

Embodiment FIG. 1 shows an example of a location where the gyro interface according to the present invention is used. That is, the gyro repeater 12 is driven by the gyro compass 11,
The output of the gyro repeater 12 is supplied to a gyro interface 13 according to the invention. The output of the gyro interface 13 is the true direction unit 1.
4 to rotate the true azimuth indicating cursor, or supplied to the northup circuit 15 to always display with north pointing directly upward.

Although not shown in the diagram, the gyro interface 13
are provided with switches, and these switches are selectively controlled according to the type of gyro compass 11 and the coupling ratio of the gyro repeater 12, and are selectively controlled according to the type of gyro compass 11 and the coupling ratio of the gyro repeater 12. Gyro interface 1 can also be used with
It is possible to drive the true azimuth unit 14 with the output of 3 and operate the northup circuit 15 correctly.

FIG. 2 shows an embodiment of the gyro interface 13 according to the present invention. Synchro repeater input terminal section 21 and step repeater input terminal section 22
The synchro repeater input terminal 21 is supplied with three-phase output signals (stay outputs) S ₁ , S ₂ , S ₃ and rotor output signals (rotor outputs) R ₁ , R ₂ of the synchro repeater. Ru. The three-phase outputs S ₁ , S ₂ , S ₃ of the synchronized repeater are converted into square waves by a waveform conversion circuit 23 . That is, due to the rotation of the rotor of the synchro repeater, the three-phase signals S ₁ , S ₂ , and S ₃ become sine waves whose phases are sequentially shifted by 120°, as shown in FIGS. 3A, B, and C, respectively. Between signals S ₁ and S ₂ ,
If the voltage is compared between S ₂ and S ₃ and between S ₃ and S ₁ and the output is high level or low level, it will be a square wave waveform conversion output.
W ₁ , W ₂ , W ₃ are obtained. Or signals S ₁ , S ₂ , S ₃
It is also possible to obtain waveform conversion outputs W ₁ , W ₂ , and W ₃ by converting the signal into a high level or a low level depending on whether it is above or below the 0 level.

The converted three-phase square wave outputs from the waveform conversion circuit 23 are latched by a latch circuit 24. This latch may be effected, for example, by the output of the monostable multivibrator 25 at each peak of the rotor signals R ₁ and R ₂ . The output of latch circuit 24 is supplied to selector 26.

On the other hand, three-phase square wave signals S ₁ ′, S ₂ ′, and S ₃ ′ whose phases are shifted by 120° from the step repeater are input to the input terminal section 22 for the step repeater, and a common potential signal C is also input. is input. This square wave signal
S ₁ ′, S ₂ ′, and S ₃ ′ are connected to the level conversion circuit 27 as necessary.
The level of the signal is converted into a signal at the operating level at the selector 26, and the blit component is removed, and the signal is supplied to the selector 26. The selector 26 selects and outputs the output of the latch circuit 24 or the output of the level conversion circuit 27 depending on whether the switch 28 is turned on or off.

The three outputs (three-phase square wave output) selected by the selector 26 are controlled by the state change detector 29 so that one pulse is output to the output terminal 30 each time the state of one of the three outputs changes. be done. For example, when the signal _W1 is the least significant bit, _W2 is the second bit from the least significant, and _W3 is the most significant bit, and the high and low levels correspond to binary numbers 1 and 0, respectively, the three bits are The binary number (state) is decoded by the decoder 29a, and its output is supplied to the encoder 29b. Encoder 29b
, the input is rearranged as a decimal number, and the value is converted to a binary number and output. That is, for example, in the example of FIG. 3, this is a state in which the gyro is rotating in the forward direction, and
As mentioned earlier, the square wave signals W ₁ , W ₂ , W ₃ are at 120°
There is _a phase difference of When converted into a base number, 5, 1, 3, 2, 6, 4 are repeated as shown in FIG. 3D. One of the six states is decoded by decoder 29a, which is then decoded by encoder 29b.
As shown in Figure 3E, 5, 1, 3, 2,
Decimal numbers 1, 2, 3, 4, 5, 6 for 6, 4
Encode so that it is output as a binary number. The least significant bit of the binary output of encoder 29b is output to terminal 31, which becomes a signal _X1 as shown in FIG. 3F. Also, the second encoder 29b
Bit output and 3rd bit output are respectively connected to terminal 3.
2 and 33, and these become signals X ₂ and X ₃ as shown in FIG. 3G and H, respectively.

The output _X1 of the terminal 31 is supplied to the pulse generator 34, and a pulse is sent to the terminal 3 at each rising and falling edge.
Output to 0. Therefore, one pulse is output from the terminal 30 each time the state of one of the three outputs of the selector 26 changes. The pulses at terminal 30 are fed to multiplier means 35 . The multiplication means 35 operates the switch means 36 to calculate the
Outputs 10 pulses, 20 pulses, or 100 pulses. In this example, the pulse at terminal 30 is transmitted to multiplier 37.
For each input pulse, the pulses from the reference pulse generator 38 are multiplied by 10, 20, and 100 times by the multiplier 3.
7 output terminals 37a, 37b, and 37c, respectively. By means of the switch means 36, the terminals 37a,
One of 37b and 37c is switched and used as the output of the multiplication means 35.

The output of the multiplication means 35 is supplied to the frequency division means 39. The frequency dividing means 39 converts the input pulse to 1/6 or 1/3 according to the setting of the switch 41 and outputs it.
For example, the frequency divider 42 divides the input pulse into 1/6,
A frequency divider 43 divides the input pulse into 1/3, and one of the outputs of the frequency dividers 42 and 43 is selected by a switch 41 and output from a terminal 44 as a pulse output.

On the other hand, in this example, in order to detect the polarity of rotation of the gyro compass, the outputs of the terminals 31, 32, and 33 of the encoder 29b in the state change detector 29 are latched by the latch circuit 46 every time the state changes.
In other words, a latch command is applied to the latch circuit 46 by the output of the pulse generator 34 with a slight delay from the change in the output state of the terminals 31, 32, 33. The output of the latch circuit 46 and the inverted output of the encoder 29b are added in a full adder 47, and the addition result is latched in a latch circuit 48. This latch occurs slightly later than the latch for latch circuit 46. The direction of rotation is indicated depending on whether the output of the latch circuit 48 is at a high level or a low level. In other words, if the rotation is in the forward direction, the latch circuit 4
The value of 6 is always 1 smaller than the output value of the encoder 29b, and the most significant bit of the adder 47 (the 3rd bit from the lowest) is always "1". On the other hand, when the rotation is in the opposite direction, the latch circuit 46 The output of the encoder 29b is always 1 greater than the output of the encoder 29b, and the most significant bit of the adder 47 is always "0". The most significant bit output of adder 47 is latched into latch circuit 48.

With this configuration, the pulse output of the terminal 44 and the pulse output of the terminal 49 can be adjusted for any type of gyro compass and coupling ratio by the settings of the switch 28 of the selector 26 and the settings of the switches 36 and 41.
The polarity output can be supplied to a true orientation unit or a northup circuit for proper operation.

That is, the repeater coupling ratio is 360 times, 180 times, 90 times, 36
There are multiples, and the indicated value of the gyro compass changes by 1°, 2°, 4°, and 10° for each repeater rotation.

Therefore, if the repeater coupling ratio is 360 times, set the switch 36 to the terminal 37a, that is, 10 times,
Furthermore, the switch 41 is set to the frequency divider 42 side. As mentioned above, the pulses supplied to the multiplication means 35 are generated for each change in state, and
This occurs six times in one rotation of the gyro repeater. Therefore, in one rotation of the gyro repeater, 6 is applied to the terminal 37a.
×10=60 pulses are generated, which are divided into 1/6 by the frequency divider 42 and output as 10 pulses.
For example, as shown in FIG. 4, the true direction unit 14 receives pulse and polarity outputs from the terminals 44 and 49 of the gyro interface, respectively, to the motor drive circuit 51.
is input, and the stepping motor 52 is rotated by the input number of pulses in the rotation direction according to the input polarity by the motor drive circuit 51. The rotation of the stepping motor 52 is transmitted to a true direction indicating cursor 54 via a gear coupler 53. If the gear ratio of this gear coupler 53 is 1/10, the switch 36 is connected to the terminal 37a, and the switch 41 is connected to the frequency divider 4.
When set on the 2nd side, the 10 pulses output to the terminal 44 are equivalently reduced to 1/10 by the gear ratio, and the true direction indicating cursor 54 rotates by 1°. In this way, the true direction indicating cursor 54 is rotated by 1 degree in one rotation of the gyro repeater with a coupling ratio of 360 times.

If the repeater coupling ratio is 180 times, switch 36
is set to the terminal 37a, and the switch 41 is set to the frequency divider 43 side. At this time, 6×10=60 pulses are obtained at the terminal 37a with one rotation of the gyro repeater, and this is divided by 1/3 by the frequency divider 43 to make 20 pulses and output to the terminal 44. Since these 20 pulses are equivalently 1/10 at the gear ratio, the true direction indicating cursor 54 is rotated by 2 degrees in one rotation of the gyro repeater. When the repeater coupling ratio is 180 times, switch 36 is connected to terminal 37b and switch 41 is connected to terminal 37b.
may be set in the frequency divider 42.

If the repeater coupling ratio is 90 times, switch 36 is set to terminal 37b, and switch 41 is set to frequency divider 43.
Set to . At this time, 40 pulses are output to the terminal 44 in one rotation of the gyro repeater, which is equivalently reduced to 1/10 by the gear ratio, and the true direction indicating cursor 54 rotates 4 degrees with one rotation of the gyro repeater. do. If the repeater coupling ratio is 36 times, switch 36
is set to the terminal 37c, and the switch 41 is set to the frequency divider 4.
Set to the 2nd side. At this time, one rotation of the gyro repeater generates 600 pulses at the terminal 37c, and this pulse is divided into 1/6, which is equivalently reduced to 1/10 by the gear ratio. Therefore, the true direction indicating cursor 54 will be rotated by 10 degrees in one rotation of the gyro repeater.

By setting the switches 36 and 41 according to the repeater coupling ratio of the gyro repeater used in this way, the output of the synchro repeater can be adjusted to the true direction through the gyro interface 13 of the present invention for any coupling ratio. The unit 14 can be supplied and driven. Furthermore, by setting the switch 28 depending on whether the type of repeater is synchro or step, this gyro interface can be used regardless of the type of gyro compass.

To supply the output of the gyro interface 13 to the north-up circuit 15, for example, the outputs of terminals 45 and 49 are supplied to a reversible counter 56 as shown in FIG. Terminal 4 depending on the polarity of terminal 49.
The pulses are added or subtracted by a reversible counter 56 starting from 5. For example, in a radar, the contents of the reversible counter 56 are preset to the angle counter 57 by a preset command from the terminal 58 every time the pointing direction and the bow direction coincide. The angle counter 57 is supplied with pulses from a terminal 59 that are generated every time the pointing direction of the radar rotates by a certain angle, and the angle counter 57 is incremented. The counted value of the angle counter 57 is converted into a sine value and a cosine value according to the angle by a sine cosine generator 61, and then output as an analog signal, and these analog signals are integrated by integrators 62 and 63, respectively. These integral outputs control the vertical and horizontal deflections of the radar display. Adjustment is made in advance so that the content of the reversible counter 56 becomes 0 when the bow direction becomes due north.

Another specific example of the multiplication means 35 and the frequency division means 39 is shown in FIG. A pulse from terminal 30 resets D-type flip-flop 65, and its output opens gate 66 and enables counter 67 to count. When the counter 67 counts a set value, it generates an output and is reset. The counter 67 counts the pulses of the reference pulse generator 38, and in this example the count value is
Generates output when it reaches 10. The output is supplied to the counter 68 as a counting pulse and is also supplied to the trigger terminal of the flip-flop 65 through the switch 36a. The counter 68 also generates an output when it counts a set value and is reset; in this case, it generates an output when the count reaches 10. Further, when the count value of the counter 68 reaches 2, the output is outputted to the AND circuit 69.
The AND circuit 69 is controlled to open and close by the switch 36c. The output of the AND circuit 69 causes the counter 6 to
8 is reset and supplied to the trigger terminal of flip-flop 65 through switch 36b.

Switch 36a has a repeater coupling ratio of 360 times and 180 times.
Switch 36b is turned on when the repeater coupling ratio is 36 times, and switch 36c is turned on when the repeater coupling ratio is 90 times. Therefore, each time one pulse is applied from the terminal 30, the pulses of the reference pulse generator 38 are counted 10, 20, or 100 depending on the repeater coupling ratio.
Flip-flop 65 is triggered and its output goes low and gate 66 closes. terminal 3
Gate 66 opens for every pulse of 0, 10 or 20
Alternatively, 100 pulses are output from the multiplication means 35.
The switches 36a, 36b, and 36c constitute a first switch means 36.

In the frequency dividing means 39, the pulses from the gate 66 are counted by a counter 71, and when the counter counts a set value, it generates an output. In this example, counter 71 supplies an output to gate 72 when counting 3, and supplies an output to gate 73 when counting 6. The outputs of gates 72 and 73 reset counter 71 through OR gate 74 and drive monostable multivibrator 75. switch 4
+V is applied to the gate 72 through the inverter 1 and to the gate 73 through the inverter 76.
If the repeater coupling ratio is 360 times or 36 times, switch 41 is turned off, gate 73 is opened, and counter 7
Takes out the 1 to 1/6 frequency division output. Repeater coupling ratio
In the case of 180 times or 90 times, the switch 41 is turned on, the gate 72 is opened, and the 1/3 frequency divided output is taken out from the counter 71.

"Effects of the Invention" As described above, by setting the switch in the gyro interface of the present invention according to the type of gyro and the coupling ratio of the gyro repeater, it is possible to However, the output of this gyro interface can be supplied to the same true direction unit or northup circuit, which is much more convenient than changing the gear coupling ratio according to the gyro or repeater coupling ratio used in the past. It is.

[Brief explanation of the drawing]

Fig. 1 is a block diagram showing an example of the application of the gyro interface of the present invention, Fig. 2 is a block diagram showing an example of the gyro interface of the invention, and Fig. 3 is for explaining its operation. 4 is a block diagram showing an example of a true direction unit, FIG. 5 is a block diagram showing an example of a north-up circuit, and FIG. 6 is a diagram showing a specific example of the multiplication means 35 and the frequency division means 39. be. 21: Synchro input terminal, 22: Step input terminal, 23: Waveform conversion circuit, 24, 46, 4
8: latch circuit, 26: selector, 27: level conversion circuit, 29: state change detector, 35: multiplication means, 39: frequency division means, 44: pulse output terminal, 4
9: Polarity output terminal.

Claims (1)

[Claims] 1. A waveform conversion circuit that inputs the three-phase output of a synchronized repeater and converts each into a square wave, a selector that selects either the output of the waveform conversion circuit or the output of the stepping repeater, and the three-phase output of the selector. a state change detector that generates one pulse each time one state changes, and a first switch means, and when the first switch means is set to 10 pulses, 20 pulses, and 100 pulses, It includes a multiplier that outputs 10 pulses, 20 pulses, or 100 pulses for each output pulse of the state change detector, and a second switch, which divides the output pulse from the multiplier by 1/2 according to the setting state of the second switch.
A gyro interface comprising frequency dividing means for dividing the frequency into 6 or 1/3 and outputting the divided frequency.