JPH0622977U - Direction finder display - Google Patents

Abstract

(57) [Summary] (Corrected) [Purpose] Both the measurement direction from the direction finder and the compass direction from the gyro compass are on the same display surface and have a radial linear display line as an angle with respect to the reference direction. indicate. [Configuration] For example, 36 display lines are provided at equal angular intervals, and one of the display lines is selected and displayed according to a signal. The measured azimuth value from the direction finder and the compass azimuth value from the gyro compass are added by half the display angular resolution of the display unit, and the added azimuth value is supplied to the display unit as a display signal. Since the added value cannot be displayed below the resolution of the display, the value is truncated and supplied to the display if necessary. The direction value θ measured by the direction finder,
The azimuth value φ of the gyro compass is 1 against the reference value.
The book is displayed in radiation. One of them is displayed by blinking to distinguish the direction display of the direction finder and the gyro compass.

Description

[Detailed Description of the Invention] "Industrial Application Field" This invention is a direction finder that displays the compass direction of the gyro compass and the measurement direction of the direction finder in a moving body equipped with the gyro compass and the direction finder. Regarding display device. "Prior Art" In a mobile device equipped with a conventional direction finder and a gyro compass, the measured azimuth value from the direction finder 51 and the compass azimuth value from the gyro compass 52 are displayed as shown in FIG. Supply to the container 53. For example, the moving body is a vessel 54, the direction of arrival θ of the radio wave by the direction finder 51 is 60 ° with respect to the bow direction of the vessel 54, and the compass direction measured by the gyro compass 52, that is, true north. When the azimuth φ with respect to is 30 °, that is, when the arrival direction of the radio wave is 90 ° with respect to true north, the display 53 displays as shown in FIG. That is, the arrival direction of the radio wave is displayed on the display surface 53a of the display 53 as a display line 55 having an angle θ, for example, and the azimuth scale 56 for the reading angle is provided around the display surface 53a. The gyro scale 57 of the movable plate is provided on the outer side of the gyro scale 57, and the gyro scale 57 is rotated to rotate by φ with respect to the nose direction, and the azimuth with respect to true north in the nose direction φ. Was being displayed. As described above, in the related art, the gyro azimuth indication mechanically rotates the ring-shaped graduation 57, which easily wears out mechanically, easily causes a failure, and is relatively difficult to read. It was hard to read when I saw it. According to the present invention, the measurement direction from the direction finder and the compass azimuth from the gyro compass are both linearly displayed as an angle with respect to the reference azimuth on the same display surface. Display with lines. Therefore, a plurality of display lines, for example, 36 display lines are provided as an indicator at equiangular intervals, and one of the display lines is selected and displayed according to an input display signal. The measured azimuth value from the direction finder and the compass azimuth value from the gyro compass are added by half the display angular resolution of the display unit, and the added azimuth value is supplied to the display unit as a display signal. Of course, the added value cannot be displayed at a portion below the resolution of the display, so the value is truncated and supplied to the display if necessary. Therefore, on the display, both the measured azimuth value of the direction finder and the azimuth value of the gyro compass are displayed with one ray with respect to the reference value at an angle with respect to the reference azimuth, and both azimuth angles θ and φ can be immediately read. You can Moreover, in this case, in order to distinguish between the two displays, one of them is displayed by blinking. This distinguishes the orientation display of the direction finder and the orientation display of the gyro compass. In addition, by adding half the value of this resolution, the selective display is performed for any one of the directions in the middle position of the display line of that resolution. [Example] An example in which the direction of the direction finder display device according to the present invention is measured by a time-division type direction finder will be described. The time division type direction finder will be described first. FIG. 1 shows a conventional time division type direction finder. It is assumed that the two loop antennas 11 and 12 are arranged orthogonally, the direction of the loop antenna 11 is north-south, and the direction of the loop antenna 12 is east-west. The loop antennas 11 and 12 are connected to the antenna switching devices 13 and 14 which constitute the directional antenna output extracting means. The antenna selectors 13 and 14 are, for example, diode switch circuits, and these antenna selectors 13 and 14 are output from the timing signal generator 15 as shown in FIGS. The signals N-S and EW, which are switch-controlled and induced in the loop antennas 11 and 12, have their polarities switched, and the signals S-N and WE are taken out in a time division manner. That is, the four antenna outputs when the directivity directions of the 8-shaped directional antenna are directed in four directions different from each other by 90 degrees are taken out in a time division manner. On the other hand, the signal C induced in the omnidirectional sense antenna 16 is phase-shifted by 90 degrees in the phase shift circuit 17 to be in phase with the output signals of the loop antennas 11 and 12, and in the combining circuit 18 in a time division manner. It is combined with the signals of the loop antennas 11 and 12 taken out. Four kinds of voltages corresponding to V _N = C + (N−S), V _E = C + (E−W), V _S = C + (S−N), and V _W = C + (W−E) from the combining circuit 18. V _N , V _E , V _S , and V _W are obtained. The output voltage signals V _N , V _E , V _S , and V _W of the synthesizing circuit 18 are supplied to the high frequency circuit 21 in the receiver 19, the output of the high frequency circuit 21 is detected by the detection circuit 22, and the detection output is required. Accordingly, it is supplied to the speaker 24 through the low frequency amplifier 23, and the received signal can be heard as sound. The peak values of the time division signals V _N , V _E , V _S , and V _W obtained from the detection circuit 22 are held in the peak hold circuits 1 _N , 1 _E , 1 _S , and 1 _W , respectively, and the peak hold circuit 1 _N is held. , 1 _E , 1 _S , 1 _W to obtain a peak hold voltage having a stable value. The peak hold voltage is selectively taken out by the multiplexer 25, and the AD converter 26 digitally outputs the time division signals V _N , V _E , V _S , and V _W at the cycle of the clock CP ₁ (FIG. 2A). The digital signal is converted into a signal, and the digital signal is taken into the computing unit 27. In this example, the computing unit 27 is a microcomputer. As is well known, the microcomputer comprises a central processing unit 28, a read only memory 29, a writable / readable memory 31, an input port 32 and an output port 33, and these respective elements are connected by a bus line 34. Predetermined operations are performed by the central processing unit 28 sequentially reading and decoding the programs that are mutually connected and stored in the read-only memory 29. The timing generator 15 receives the supply of the clock signal CP ₂ from the output port 33 of the arithmetic unit 27 and produces the timing signals Pa to Pb (B to E in FIG. 2) and the clock CP ₁ (A in FIG. 2). Therefore, the operation of the arithmetic unit 27 and the digital signal input from the AD converter 26 are synchronized, and the arithmetic unit 27 discriminates and takes in the time division signals V _N , V _W , V _S , and V _E , respectively. be able to. The time-division signals V _N , V _W , V _S , and V _E captured via the input port 32 are stored in respective areas provided in the writable / readable memory 31. A cardioid characteristic 43 is obtained by combining the 8-shaped directional characteristic 41 of the loop antenna (FIG. 3A) and the omnidirectional characteristic 42 of the sense antenna. As shown in FIG. 3B, the output voltages V _N , V _E , V _S , and V _W of the combining circuit 18 correspond to the output voltages when the cardioid characteristics are directed to north, east, south, and west, respectively. The example shown in FIG. 2F is a time division signal when a radio wave arrives from the north as shown by an arrow 44. Because of this relationship, the quadrant of the arrival direction of the radio wave is determined as follows. _{V N -V S> 0, V} E -V W> first quadrant _V N _{-V S> 0} when 0, V E _-V W <second quadrant _V N _-V S <0 when 0, _{V E} fourth quadrant and when the -V _W <third quadrant _V N _-V S _<0 when 0, V E _-V W> 0 the vector operation of _{(V E -V W) / (} V N -V S) Run. The numerical value D obtained by this vector operation represents tan θ (θ corresponds to the arrival direction of the radio wave), and the angle θ is obtained from the value of K by referring to the conversion table stored in the memory 35. The direction of arrival of the radio wave is obtained from this angle θ and the previously obtained quadrant. That is, when it is determined to be the first quadrant, the arrival direction is 360 ° -θ °, when it is determined to be the second quadrant, the angle value θ ° is used as it is, and when it is determined to be the third quadrant, 180 ° -θ ° is set to 180 ° -θ °. The arrival direction is 180 ° + θ ° when it is determined to be in the fourth quadrant. The obtained radio wave arrival direction is displayed on the display 36 through the output port 33. The central processing unit 28 executes the above θ processing. Now, when the direction of arrival of the radio wave is in the θ direction to the north, the amplitude of the voltage obtained from the loop antenna 11 becomes V _Y = V _l cos θ as shown in FIG. 4A, and the amplitude of the voltage obtained by the loop antenna 12 is As shown in FIG. 4B, V _X = V _l sin θ. When the amplitude of the voltage obtained from the sense antenna 16 is V _S (V _l ≦ V _S ), the phase shift between the loop antenna output and the sense antenna output in the combining circuit 18 is φ, and the angular frequency of the incoming radio wave is ω. The output of the loop antenna 11 is V _l cos ωt · cos θ (1), and the output of the sense antenna is V _S cos (ωt + φ) (2). Equation (3) is obtained by adding Equation (1) and Equation (2). (V _l cos θ + V _S cos φ) cos ωt−V _S sin φ · sin ωt (3) The amplitude value of the equation (3) is Becomes Similarly, the signals V _E , V _S , and V _W are respectively expressed by the following equations. From this, the following equation is obtained and the azimuth θ is measured. In this example, a case is shown in which V _N ² , V _E ² , V _S ² , and V _W ² are obtained in order to calculate the radio wave arrival direction θ. In this way, the azimuth θ can be accurately obtained without being affected by the phase shift φ. FIG. 5 shows an example of the processing operation. The quadrant determination routine R ₁ may determine which _one of the first to fourth quadrants, that is, V _N , V _E , V _S , and V _{W according} to the above-mentioned items. The determination may also be performed by steps S _{1 to} S ₇ using V _N ² , V _E ² , V _S ² , and V _W ² . Step S ₄ to any of the quadrants determined in S ₇ is stored in the memory 31 can be reading and writing. Is calculated (step S ₈ ). Then refers to the conversion table, that is 'reads the memory 35 Te ^{tan -1} D as an address' determining the angle θ of the operation result D of the step _{S 8} (Step _S 9). Next, according to the result of the previously determined quadrant determination routine R ₁ , when it is in the first quadrant, 360 ° −θ, when it is the second quadrant, it is θ, and when it is the third quadrant, it is 180 ° −θ. In the fourth quadrant, θ + 180 ° is calculated to obtain the azimuth angle (step S ₁₀ ). The azimuth measurement is performed at regular intervals, and the azimuth measurement results for a plurality of times, for example, 20 times or 40 times, are stored in the readable / writable memory 31, and the oldest azimuth measurement result is obtained each time a new azimuth measurement result is obtained. Then, the average value of the latest 20 or 40 azimuth measurement results obtained at all times is calculated (step S ₁₁ ), and a fixed error caused by the antenna arrangement or the like is added to the averaged azimuth measurement results. performs correction (step _{S 12),} and displays on the display device 36 the corrected wave arrival direction (step _S 13). In this invention, for example, as shown in FIG. 6, the display surface 36a of the display 36 is provided with a ring-shaped angle scale 61, and the arrival direction of the radio wave is at an angle with respect to the reference direction (N direction in this example) passing through the center thereof. Is displayed as a display line 62, and the nose direction, that is, the bow direction is displayed as a display line 63. That is, the reference direction is the north N direction in this example, whereas the display of the bow direction 63 is displayed with the angle φ, and the display 62 of the arrival direction of the radio wave is displayed with the angle θ with respect to the bow direction display 63. It That is, the display 62 of the arrival direction of the radio wave is displayed as φ + θ with respect to the direction of the reference direction N. This display example displays the relationship shown in FIG. Further, in this case, in order to distinguish between the two display lines 62 and 63, the nose direction display 63 is a blinking display, and a broken line is shown to show the blinking state of the display line 63. Further, the angle scale 61 may be fixedly written, for example, by printing, or may be displayed as a fixed pattern on the display 36. Further, in this example, a digital display unit 65 is provided to display the arrival direction θ + φ of the radio wave with respect to the north direction. As such a display device 36, as shown in FIG. 7, for example, in a liquid crystal display device, a plurality of linear display electrodes 66, for example 36, are provided at equiangular intervals. The register 67 and the compass register 68 store the respective azimuth values as display signals, and the display signals input to these registers 67 and 68 are supplied to the decoder drivers 71 and 72, respectively. The output terminal is connected in parallel to each one of the 36 display electrodes 66. An output is generated at one of the output terminals according to the value of the display signal input to the decoder drivers 71 and 72. That is, the display 36 selectively displays one line on the display line provided at equiangular intervals according to the input display signal. Further, in this example, an oscillator 73 for blinking is connected to the decoder driver 72, so that the content of the decoder driver 72 is displayed as a blinking display line. Further, the display 36 is provided with a digital display register 74, and in this example, a value indicating the true direction of the arrival direction of the radio wave is stored in the register 74. The value stored in the register 74 is decoded by the decoder driver 75, and, for example, 7 segments are arranged in the shape of a letter and a display unit 76 for selecting these and displaying numbers 0 to 9 is provided in the decoder driver 75. The display is driven by the output and displayed on the digital display unit 65 in FIG. In order to perform such display, the display signals are stored in the registers 67, 68 and 74, for example, from the arithmetic unit 27 in FIG. 1 through the output port. Therefore, the compass direction φ from the gyro compass 52 is input to the computing unit 27 through the input port 32. To perform the angle display in step S ₁₃ in FIG. 5, measuring azimuth as shown in FIG. 8, that is, the addition operation on the operation value θ and the compass heading value φ is performed (step S _20). In this case, it is checked whether or not the compass display mode is selected (step S ₂₁ ). In this compass direction display mode, that is, when the compass display key (in the keyboard 37) is ON, the compass is displayed through the input port 32. The azimuth value φ is input, and φ = 0 is used as the compass azimuth value in the calculation of step S ₂₀ when not in the compass azimuth display mode (steps S ₂₂ and S ₂₃ ). To the added value θ + φ, ½ of the angular resolution Δθ of the display device 36, for example, 5 ° in the case of 36 lines is added (step S ₂₄ ). The part of the added value that is less than or equal to the azimuth resolution is discarded. In this example, the portion of 1 ° or less is cut off and the portion of 10 ° or more is cut out (step S ₂₅ ). Stores the truncated remaining values in azimuth registers 67 of FIG. 7 (step S _26). Similarly to the compass direction φ Addition is performed (step S ₂₇ ), the portion of the added value that is less than or equal to the azimuth resolution is truncated (step S ₂₈ ), and the remaining truncated value is a 2-digit gyro azimuth value in this example, which is the compass register in FIG. 7. It stores in 68 (step S ₂₉ ). In this way, the radio wave arrival direction and the compass direction are displayed on the display 36 as angles θ + φ, φ with respect to the reference direction. Meanwhile storing added value in step _{S 20} on the digital display register 74 in FIG. 7 (step _S 30). As a result, digital display is performed. Step _{S 24} to _{S 30} is performed in a suitable order in practice. In this way, when the measurement azimuth and the compass azimuth are displayed as angles with respect to the reference azimuth, both of them are not limited to the case where north is the azimuth, and for example, as shown in FIG. The north azimuth, that is, the measurement angle φ by the gyro may be displayed by the gyro display line 63, and the radio wave arrival azimuth θ with respect to the nose azimuth 78 may be displayed by the azimuth display line 62. In this case, rather than the sum of the step S orientation measurements phi + compass heading value calculation in ₂₄ phi in Figure 8, is performed to measure the azimuth value theta, In step S ₂₇ Good. Further, in this case, as shown in FIG. 9, a display showing the approximate shape of the moving body equipped with the direction finder, for example, in the case of a ship, a display 79 of the ship is displayed by printing at the center of the display surface 36a. If the direction of the aircraft display 79, that is, the nose direction is oriented toward the reference azimuth 78, it is possible to judge even from a distant point in the three directions of the nose azimuth of the moving body, the north azimuth, and the radio wave arrival azimuth. It will be easier. The machine body display 79 may be displayed as a fixed pattern at the same time as the angle scale 61, or may be displayed by printing or the like. [Advantage of Device] As described above, according to this device, both the radio wave arrival direction and the gyro direction are displayed on the same display surface and as an angle with respect to the reference direction. The true value is often located in the middle of the cover line because it can be determined and the display has a relatively coarse resolution. However, the true value is always displayed on the closer display line. Furthermore, since the display scale is not mechanically driven, there is no mechanical wear, and it is hard to break down and highly reliable. In the above description, the arithmetic operation is performed by the arithmetic unit 27, but the processing shown in FIG. 8 may be performed by hardware in the display, for example.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing a direction finder which can be used in the present invention, FIG. 2 is a time chart used for explaining its operation, and FIG. The figure which shows the example of a synthetic | combination of the directional direction with a directional antenna, FIG. 4 is a figure which shows the relationship between a directional antenna, a radio wave arrival direction, and its received amplitude, FIG. 5 is a flowchart which shows the operation process of FIG. FIG. 6 is a diagram showing a display example on the display device according to the present invention, and FIG.
FIG. 8 is a block diagram showing a main part of a display device according to the present invention, FIG. 8 is a flow chart showing an example of a display processing operation, FIG. 9 is a diagram showing another display example according to the present invention, and FIG. 10 is a direction finder. FIG. 11 is a block diagram showing a relationship between a gyro compass and a display, FIG. 11 is a view showing a relationship between a moving body and its nose direction, a gyro compass display direction, and a radio wave arrival direction. FIG. 12 is a view showing a conventional display device. Is.

Claims (1)

[Claims for utility model registration] (1) In a direction finder display device for displaying the direction of a direction finder attached to a moving body equipped with a gyro compass, the measured azimuth value of the direction finder is displayed in angular resolution. A second adding means for adding a half value of the display angular resolution to the compass azimuth value of the gyro compass, a second adding means for adding a half value of the gyro compass, and a second adding value of the first adding means and the second value. An added value of the addition means is input as a display signal, and a display device for selecting and displaying one of the display lines arranged at equal angular intervals with the above-described display angular resolution according to the input display signal, and a display thereof. Direction finder display device comprising: blinking means for blinking the display with respect to one of the display signals of the first and second adding means input to the vessel.