JPS6142802B2 - - Google Patents

Description

[Detailed Description of the Invention] (a) Technical Field This invention measures the navigational position using a navigation device such as a Loran receiver, an Omega receiver, or an NNSS receiver, and uses the measurement results to determine the position of the own ship. The present invention relates to a device that displays a track record on a display such as a cathode ray tube.

(b) Prior Art and Its Disadvantages Conventionally, various devices have been proposed as track recording devices that record tracks on a nautical chart using an XY-axis recorder. However, with this type of device, it is necessary to adjust the amount of movement of the recording pen each time the scale of the chart changes, and it is necessary to set a reference point on the chart in advance to record the position change on the track. The handling of the device was extremely complicated.

Furthermore, as disclosed in Japanese Patent Application Laid-Open No. 141662/1984, map information is provided using microfilm, etc., the moving direction and moving speed are detected using a sensor, and based on this information, information is displayed on the screen. A device has been proposed that displays a map overlaid on a moving track.
This device has the following drawbacks.

(1) The position information detected by the sensor is not absolute position information, but only relative position information with respect to a certain reference position (start position, etc.). For this reason, the storage memory circuit only records movement trajectories relative to the reference position, and if you want to display markers (latitude, longitude lines, etc.) on the screen to know the current position or any position, the information must be included in the map information, and if the map information is not provided or if the map information does not have marker information (latitude, longitude lines, etc.), the movement trajectory can be seen on the screen, but the current position ( Absolute position expressed in latitude, longitude, etc.) or past position (absolute position expressed in latitude, longitude, etc.) cannot be immediately known.

(2) If the map information is provided using microfilm, etc., even if marker information is included in the map information, if the trajectory of the moving object becomes long, the microfilm, etc. must be replaced midway. If the reference position is not known at the time of replacement (which is likely to be the case in many cases), the operation becomes complicated and the scale ratio and reference position must be adjusted each time the replacement is performed. adjustment becomes almost impossible.

(3) If the current absolute position (reference position) is not given by some means before movement, there will be no correspondence between the movement trajectory on the screen and the map, and the displayed movement trajectory will be completely meaningless. Become something.
For this reason, when turning on the power of the device at any time while the moving body is moving, not only can the locus of movement not be matched with the map, but the current position cannot be known at all.

As mentioned above, the device described in JP-A No. 52-141662 can display the movement trajectory on the screen, but the data stored in the memory is relative position data. , it is not possible to display a trajectory that is valuable as information unless marker information is provided by other means, and even if marker information is included in the map information, it may be difficult to display the trajectory depending on the length of the movement trajectory. In the end, it became necessary to replace the microfilm, etc. that provides map information midway through the process, making the operation complicated and making adjustments after replacement almost impossible.

(c) Purpose of the Invention The present invention solves the above-mentioned drawbacks, is very convenient to operate, and allows the current and past absolute positions to be immediately known on the screen without providing additional marker information. Another object of the present invention is to provide a track recorder that can easily and smoothly grasp the amount of displacement of a track.

(d) Structure of the invention This invention is constructed as follows.

An accumulation and storage circuit is provided to accumulate and store the current absolute navigation position as track data based on the measurement results of a navigation device that measures the navigation position of Loran and the like. Further, means is provided for generating data of marker display elements for recognizing navigation positions such as latitude and longitude lines on a map based on the track data stored in this circuit. Since the absolute navigation position is stored in the storage and recording circuit, the data of the marker display element can be immediately generated from the data. That is,
Latitude, longitude lines, etc. can be generated using only the data stored in the storage circuit.

A display memory circuit is provided for storing the track data stored in the storage memory circuit and the data of the marker display element generated by the track data. This display storage circuit has a storage section that geometrically corresponds to each display position on the display screen, and stores the track data and the data of the marker display element in the storage section corresponding to the display position on the display screen. do. Further, a display device is provided to display the data stored in this display storage circuit. Further, an operation switch is provided for instructing to change the storage state of the display memory circuit in order to move the data stored in the display memory circuit in any direction or to enlarge or reduce the display data. The operation switches include a screen movement switch and a screen reduction/enlargement switch.

With the above configuration, marker display elements such as latitude and longitude lines can be generated based on track data without using sensors other than a navigation device or without providing map information through another input means. , those data are displayed on the display. Further, the display state can be set to a desired state using an operation switch.

(e) Embodiment FIG. 1 shows a display state on a cathode ray tube display of a track recorder according to an embodiment of the present invention, and FIG. 2 shows an operating switch.

In FIG. 1, numeral 1 indicates a cathode ray tube display surface on which a map is displayed and a track is recorded. Note that the display device is not limited to a cathode ray tube as in this embodiment, and other well-known display devices such as a plasma display, an electroluminescence display, or a liquid crystal display may be used.

On the display surface 1, a track 2, latitude and longitude lines 3 and 4, which are marker display elements, cursor lines 5 and 6, which are also marker display elements, an event mark 7, and latitude and longitude display values 8 and 9 are displayed. , the current position 2' on the display screen 1 also moves according to the displacement of the navigation position of the own ship.

In this state, if you want to know the exact latitude and longitude of your current location, move the cursor lines 5 and 6 in the up, down, left, and right directions using the operation switch described later, and move the intersection point to 2'. All 5 cursors,
The numbers 8 and 9 displayed on 6 are designed to represent the latitude and longitude at which the cursor line is located, respectively, so by aligning the intersection of the cursor lines with the current position 2', the latitude and longitude of the current position can be determined. can be known. Further, since the latitude and longitude lines 3 and 5 displayed on the screen can be determined by the cursor lines 6 and 9, the current position can be roughly known from these latitude and longitude lines.

The event mark 7 is a small rectangular mark that is displayed at the intersection of the cursor lines 5 and 6 by the operation switch, and by placing the current position 2' within this mark, it can be easily matched with the intersection of the cursor lines. I can do it. Note that since the cursor lines 5 and 6 can be moved completely freely within the display surface 1, latitude and longitude information can be easily obtained at any point within the display surface 1.

Next, the correspondence between changes in the display state of the display surface 1 and the operation switches will be explained with reference to FIG. 2.

The screen movement switch 10 moves the entire display content on the display surface 1, and is composed of four switches that move the screen in the up, down, left and right directions. Similarly, the cursor movement switch 11, which is composed of four switches, is a switch that moves the cursor lines 5 and 6 displayed on the display surface 1 in the X-axis and Y-axis directions in the vertical and horizontal directions.

The reduction/enlargement switch 12 changes the trajectory 2 on the display surface 1.
Switch to reduce or enlarge the display.
Two switches determine the reduction rate and enlargement rate, respectively. The mark switch 13 is a switch that displays a small rectangular mark 7 at the intersection of the cursor lines 5 and 6 on the display surface 1.

The time setting switch 14 is a switch for setting the time interval for writing from the accumulation memory circuit to the display memory circuit, as will be described later.If it is set to a short time, the track changes at short time intervals, and if it is set to a long time, the time interval is set. Track changes at long time intervals can be grasped on the display screen 1.

With the functions of the operation switch described above, the operator can easily and accurately analyze the track of his own ship on the display screen 1 by scaling or enlarging it or moving the cursor lines 5 and 6. be able to.

(Description of Configuration) Next, with reference to FIG. 3, the overall configuration of the above-mentioned track recording device will be described.

This figure shows a block diagram of a track recorder in which the display contents of FIG. 1 are displayed on a cathode ray tube display and the operation switch of FIG. 2 is provided as an input section.

In the figure, the navigation device 20 is, for example, a Loran receiver, an Omega receiver, an NNSS receiver, etc., and its output data is constantly supplied to an interface 21. In order to use navigation equipment such as Loran receiver, Omega receiver, NNSS receiver, etc.
The output data itself includes absolute navigation position information.

Each operation switch shown in FIG. 2 is connected to a code generator (not shown), and the operation contents are converted into a predetermined code and supplied to the interface 22. The interfaces 21 and 22 are composed of a plurality of I/O interface LSIs that are compatible with a microprocessor that is the core of a control section to be described later.

The control unit consists of a CPU 23 microprocessor, for example, a Texas Instruments microprocessor.
A 16-bit microprocessor TMS9900 is used.

The above-mentioned interfaces 21, 22, and the ROM and RAM described later are connected to the above-mentioned CPU 23 via a data bus Dn for sending and receiving data, and an address bus for specifying memory addresses and selecting chips.
An, and a control bus Cn.

The ROM 24 is a memory that stores control procedures and character pattern codes for the CPU 23, and has a capacity of 16 Kbytes in this embodiment. Further, the storage memory circuit 25 and the display memory circuit 26 each record a change in the navigation position within a predetermined time based on the measurement result from the navigation device 20, that is, an absolute navigation position based on the measurement result from the navigation device 20. A RAM that stores and stores data, and another RAM that reads the memory contents of the storage circuit and stores the data of marker display elements for recognizing navigation positions such as latitude, longitude lines, and cursor lines on the map. It is structured as follows.

The storage contents of the display memory circuit 26, which is the latter RAM, are made to correspond geometrically to the display position of the cathode ray tube display 27, and the display data is transferred from the display memory circuit 26 to the cathode ray tube display via the shift register 23. 27.

As mentioned above, since the storage contents of the display memory circuit 26 correspond geometrically to the display position of the cathode ray tube display 27, in other words, the display memory circuit 26 has the same number of pixels as the number of pixels displayed on the cathode ray tube display 27. Since it has a capacity made up of storage elements, display data is transferred to the shift register 28 in synchronization with the scanning signal of the cathode ray tube display 27.

Next, a section for controlling the output of display data to the cathode ray tube display 27 will be explained.

A horizontal and vertical scanning circuit 29 performs horizontal and vertical scanning of the electron beam of the cathode ray tube display 27. This horizontal and vertical scanning is performed in synchronization with the counting operations of the horizontal scanning counter 30 and the vertical scanning counter 31.

Horizontal scan counter 30 is connected to clock pulse source 32.
One horizontal scan is performed between the start of counting and the sending of a carry pulse. The carry pulse of the horizontal scanning counter 30 is further counted by the vertical scanning counter 31, and the vertical scanning is completed between the time when counting starts and the time when the carry pulse is sent out. At this time, one raster is drawn on the cathode ray tube display 27.

As is clear from the above, CRT display 2
The scanning position of the electron beam at step 7 is determined by the count value of the vertical scanning counter 31 of the horizontal scanning counter 30.

Horizontal scanning counter 30 and vertical scanning counter 31
Each count value is sent to the display memory circuit 26, and the storage contents of the memory element corresponding to the count value are read out. The display memory circuit 26 has a storage capacity equal to the number of pixels displayed on the cathode ray tube display 27, and the storage contents of the memory elements corresponding to the scanning positions of the cathode ray tube display 27 are stored in the horizontal scanning counter 30 and the vertical scanning counter 30. The count value of the counter 31 is read out. The read storage output is sent to the shift register 28. The shift register 28 converts the sequentially read out storage signals into a time series using a clock pulse train from the clock pulse source 32 and sends them to the luminance terminal of the cathode ray tube display 27.

With the above configuration, the data stored in the display storage circuit 26 is constantly scanned by the counters 30 and 31, and the display state of the cathode ray tube display 27 is continuously refreshed.

From the configuration of this device described above, the main control contents of the CPU 23 are: importing measurement data from the navigation device 20, processing and writing the imported measurement data to the storage circuit 25, importing input data from the operation switch, The main control is to update or change the storage contents of the display storage circuit 26 based on this input data, and to generate marker display elements such as latitude and longitude lines.

(Description of Operation) The above-mentioned control contents by the CPU 23 will be explained below in relation to the operation switch.

(Intake of measurement data and storage memory circuit 2
Write to 5. ) The measurement data from the navigation device 20 is almost continuously
The data is captured by the CPU 23, and changes in the navigation position within a certain period of time are written into the storage circuit 25 based on the measured data. in this case,
The CPU 23 first calculates and obtains the latitude and longitude of the navigation position from the measured data, and writes them together with the results. In this way, since the measurement data from the navigation device 20 is continuously taken in by the CPU 23,
Changes in the navigation position in the accumulation storage circuit 25 are performed while being updated sequentially.

(Fetching input data from the operation switch, and updating and changing the memory contents of the display memory circuit.) First, depending on the time setting position of the time setting switch 14, the CPU 23 moves the trajectory from the storage memory circuit 25 to the display memory circuit 26. Define the recording writing time interval. In this case, as described above, when the time interval is set to a short time, tracks are recorded at short intervals, and when set to a long time, tracks are recorded at long intervals. Furthermore, writing to the display memory circuit 26 is performed by writing to a predetermined memory element according to the latitude and longitude information stored in the storage memory circuit 25, that is, by making the display screen and the memory state correspond geometrically. , display control on the cathode ray tube display 27 is made relatively simple.

Next, the reduction/enlargement control of the display screen size by the reduction/enlargement switch 12 is performed by writing all the track records in the storage memory circuit 25 into the display memory circuit 26;
Alternatively, write while thinning out. Therefore, in the case of the maximum enlargement ratio, the CPU 23 writes all the stored contents of the accumulation memory circuit 25 into the display memory circuit 26, and on the other hand, writes them while thinning out the contents when reduction is instructed. In this case, reduction and enlargement are performed with reference to the center point of the screen of the cathode ray tube display 27, but they can also be performed with reference to the current position 2' of the wake 2 using a switch (not shown). When enlarging or reducing the current position 2' as a reference, the current position of the own ship is read out from the storage circuit 25, and the cathode ray tube display 27
Control is performed so that the current position of the ship is written in the storage element of the display storage circuit corresponding to the center point of the ship.

Movement of the display surface 1 in the vertical and horizontal directions by the screen movement switch 10 is performed by rewriting the memory contents of the display memory circuit 26 into memory elements that are entirely shifted in a designated direction.

(Generation of Marker Display Element Data) When the track record is written to the display storage circuit 26, the CPU 23 determines the latitude and longitude lines within a certain range including the track to be displayed on the cathode ray tube display 27. The latitude and longitude lines are written in the corresponding memory elements of the display memory circuit 26. The reason why the latitude and longitude lines can be generated only based on the track data stored in the storage circuit 25 is because each navigation position data stored in the storage circuit 25 is absolute navigation position data. For example, if navigation position data of 135° east longitude and 30° north latitude is stored, a longitude line of 135° east longitude passing through that position can be immediately generated. Similarly to the latitude and longitude lines, the CPU 23 also independently generates display data for the cursor lines 5 and 6 and writes them into the storage circuit 26.

The movement of the cursor lines 5 and 6 by the cursor movement switch 11 rewrites the cursor line data in the display memory circuit 26 to the memory element shifted in the direction of movement of the switch, as in the case of screen movement. I'll pull over and do it.

At this time, the CPU 23 calculates and obtains the latitude and longitude of the new position of the cursor line, reads the pattern signal of the numerical value from the ROM that stores pattern signals of various devices in advance, and writes the contents to the cursor line. Write processing is performed to a storage element adjacent to a position where line data is stored.

As a result, as shown in FIG.
6, the latitude and longitude at which the cursor line is located are displayed on the display surface 1 as numerical values 8 and 9, and the numerical values also change as the cursor line moves.

The display of the small rectangle 7 by the mark switch 13 is as follows.
The CPU 23 determines the intersection of the cursor lines 5 and 6 when the mark switch 13 is operated, and performs processing to write small rectangular display data around the memory element of the display memory circuit 26 corresponding to the intersection position. Then it will come true.

The control and processing contents of the CPU 23 have been explained above based on each operation switch, but these can be specifically programmed according to the instruction set of the microprocessor to be used. Of course, the control section may be configured with a minicomputer or may be configured with discrete circuit elements.

Further, the same applies to the control and processing when the track is recorded in the storage circuit 25 based on the measurement results from the navigation device 20.

4A and 4B are flowcharts showing the operation of the CPU 23 described above. A in the figure shows the operation executed when the operation switch is operated, and B in the same figure shows the operation executed when data is input from the navigation device 20.

When there is an input from the operation switch, the step
In step n1, the input data of the operated switch is generated and stored in a RAM area (not shown).When data is input from the navigation device, the absolute navigation position is determined based on the data input from the navigation device in step n2. is determined and its position is stored in the accumulation storage circuit 25. In addition, n3 generates data for marker display elements such as latitude, longitude lines, and cursor line based on the data of the absolute navigation position. Furthermore, in step n4, a display memory circuit writes absolute navigation position data and marker display element data based on the input data of the operation switch input in step n1 (or based on predetermined data if there is no input of the operation switch). Find the address of and store it at that location. Furthermore, in step n5, the data stored in the display storage circuit 26 is moved or updated based on the input data of the operation switch, and the process returns.

(f) Effect of the Invention As described above, according to the present invention, a track record can be obtained as a software screen using a cathode ray tube display, etc., and a track record generated based on the track data is displayed on the screen together with the track. Since the marker display elements are displayed, the current position and past position can be immediately and accurately known on the screen only by the data from the navigation device, without providing the marker display elements or map information by other means. I can do things. In addition, the data for marker display elements is not generated independently, but is generated based on the track data, so markers such as latitude and longitude lines are always displayed on the screen no matter where the track data is. elements can be displayed. Furthermore, since it is equipped with an operation switch input section including a screen movement switch and a screen reduction/enlargement switch, the display screen can be easily moved, reduced or enlarged, and the track data and markers can be easily moved, reduced or enlarged. Since the data of display elements is stored in a display memory circuit that geometrically corresponds to the display screen, by changing the storage state, it is extremely easy to move, reduce, or enlarge the screen, which simplifies the circuit configuration. There are advantages.

[Brief explanation of the drawing]

Figure 1 shows the display state on the cathode ray tube display of a track recorder that is an embodiment of the present invention, Figure 2 shows the operation switch section of the track recorder, and Figure 3 shows the overall configuration of the track recorder. Figure 4.
Figures A and B are flowcharts showing the general operation of the track recorder. 1 - CRT display surface, 2 - Track, 3, 4 - Latitude and longitude lines, 5, 6 - Cursor line, 10 to 14 -
Operation switch, 20-navigation device, 23-CPU,
25-accumulation memory circuit, 26-display recording circuit.

Claims (1)

[Scope of Claims] 1. An accumulation memory circuit that accumulates and stores an absolute navigation position as track data based on the measurement result of a navigation device that measures the navigation position; and a map based on the track data stored in the accumulation memory circuit. marker display element data generation means for generating data of marker display elements for recognizing navigation positions such as latitude and longitude lines; The data generated by the marker display element data generation means and the track data stored in the storage storage circuit are stored in the storage unit which is a display position on the display screen of the display device. a display memory circuit, which includes a screen movement switch and a screen reduction/enlargement switch, and is capable of changing the storage state of the display memory circuit, such as moving data stored in the display memory circuit in an arbitrary direction. A track recorder comprising: an operation switch input section for instructing to set the display state on the display to a desired state.