JP2610473B2 - Radar equipment - Google Patents

Description

The present invention relates to a radar device capable of off-center display.

FIG. 6 shows a conventional radar device. The radar signal from the input terminal 11 is supplied to an AD converter 12 and is converted into a digital signal. The digital signal is written to the buffer memory 13, and the digital signal of the buffer memory 13 is stored in the main memory.
Transferred to 14. On the other hand, the reference clock from the reference clock generator 15 is frequency-divided by the frequency divider 16 to generate clocks having frequencies corresponding to various detection ranges. One of these clocks is selected according to the range code set by the clock selector 17, and the selected clock causes the AD converter
Twelve samplings are performed. The selected clock is supplied to a sampler / transfer controller 18, and its output controls a buffer memory address counter 19 to control the writing of the output of the AD converter 12 to the buffer memory 13, Transfer control to the main memory 14 is performed. The output of the sample / transfer control unit 18 is also input to an XY conversion circuit 21, where the polar coordinates of the radar signal are converted into rectangular coordinates, and a transfer address for the main memory 14 is generated from the main memory address counter 22. The XY conversion circuit 21 receives from the angle counter 23 data indicating the detected azimuth of the radar.

The digital signal written in the buffer memory 13 is transferred to the main memory 14 in a predetermined number of bits, for example, 256 bits, which is a transfer section. The number of transfer bits at this time is 256 bits at any angle of 360 ° regardless of the angle data. When the radar center is displayed shifted from the center of the display screen, for example, when the center is off-centered by 1.5 times, the number of transfer bits is increased to 256 bits × 1.5. That is, as shown in FIG. 7, a 0.5 times extra storage area 25 is provided around the storage area 24 corresponding to the display screen, and in the case of off-center display, the center address is shifted, and
As shown in the figure, the upper memory is read out and displayed. Therefore, if the center is 1.5 times off center, a memory capacity four times as large as a memory capacity required for normal display is required.

It is an object of the present invention to provide a radar device capable of off-center display without increasing the capacity of a main memory.

"Means for Solving the Problems" According to the present invention, a transfer amount control unit is provided, and offset position data with respect to the display center and detection azimuth data are input, and the input offset position data is used to adjust the display center with respect to the display center. Calculates the distance from the offset position to the outer periphery of the radar image display in the direction corresponding to the input detection direction data, and controls the amount of data transferred from the buffer memory to the main memory for each angle according to the distance I do.

"Embodiment" FIG. 1 shows an embodiment of the present invention, and portions corresponding to FIG. 6 are denoted by the same reference numerals. In the present invention, a transfer amount control unit 31 is provided. Offset data and azimuth data from the angle counter 23 are input to the transfer amount control unit 31, and the amount of data transferred from the buffer memory 13 to the main memory 14 for each angle is controlled according to these data.

That is, for example, in off-center display as shown in FIG. ₂ , the transfer is performed by an amount corresponding to the lengths l ₁ , l ₂ , l ₃ ... From each angle from the radar center 32 to the display outer periphery 33. That is, as shown in FIG. 3, when the offset amount from the display center 34 to the radar center 32 is Δa, the radius from the display center 34 to the display outer periphery 33 is r, and the azimuth angle is θ, the transfer amount x is Ask by The XY conversion circuit 21 also shifts the coordinates according to the offset amount. In this manner, the main memory 14 only needs to have the minimum capacity required for the display.

In the case where a full display is performed on the rectangular display screen as shown in FIG. 4, x ₁ = Y / cos θ _{1 in} the area and x ₂ = in the area according to the offset positions X and Y as shown in FIG. X / cos
the theta ₂ may be set each transfer amount.

[Effects of the Invention] As described above, according to the present invention, the offset display can be performed with only the minimum capacity of the main memory 14 required for display.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an example of a radar device according to the present invention, FIG. 2 is a diagram showing a transfer amount for each angle, FIG. 3 is a diagram showing a method for obtaining a transfer amount for each angle, and FIG. Is a diagram showing a transfer amount for each angle when displaying a full display surface, FIG. 5 is a diagram showing a method of obtaining a transfer amount in the case of FIG. 4, and FIG. 6 is a block diagram showing a conventional radar device. FIG. 7 is a diagram showing storage in a main memory of a conventional radar device, and FIG. 8 is a diagram showing an area of offset display in the main memory of the conventional radar device.

Claims (1)

(57) [Claims] 1. A radar signal is converted into a digital signal by an AD converter, the digital signal is written in a buffer memory, the digital signal in the buffer memory is converted into a polar coordinate system and written into a main memory, and the main memory is read. In a radar apparatus for displaying a radar image on a display device by inputting offset position data with respect to a display center and detection azimuth data, from the position offset with respect to the display center by the input offset position data, Transfer amount control for calculating the distance to the radar image display outer periphery in the direction corresponding to the input detection direction data and controlling the amount of data transferred from the buffer memory to the main memory for each angle in accordance with the distance. A radar device characterized by including a part.