KR20180082149A - A digital radar system having arpa function - Google Patents

Abstract

The present invention relates to a 3D electronic navigational chart display system capable of being used in all possible platforms by performing a method of texturing an electronic navigational chart drawn in 2D on a 3D surface. The 3D electronic navigational chart display system comprises: a storage unit composed of an electronic navigational chart component for sailing which is operable in a platform based on a PC or a mobile device and a platform based on an embedded system, and storing an electronic navigational chart composed of a surface coordinate system corresponding to a global latitude and longitude coordinate system; a drawing unit configured to perform drawing of the electronic navigational chart on a model structure, convert a polygon into a triangular mesh on a 2D surface, and draw a 3D electronic navigational chart object; a display unit configured to display the electronic navigational chart and the drawing 3D electronic navigational chart object; and a control unit configured to control display of the electronic navigational chart and the drawn 3D electronic navigational chart object on the display unit according to a result of the drawing of the drawing unit.

Description

[0001] The present invention relates to a compact digital radar system having an ARPA function,

The present invention relates to a small-sized radar system, and more particularly, to a digital radar system having a low-cost RSC board capable of implementing an ARPA function in radar data of a pulse radar and an FMCW radar, will be.

ARPA radar stands for Auto Radar Plotting Aids and is called an automatic radar plotting device. The radar plotting is a method of calculating the true path and the true azimuth of the target by applying a subtraction operation (vector operation) to the main motion vector composed of the relative motion of the radar object and the motion vector constructed on the other side.

Prior to the development of the computer, as shown in Fig. 1, the vector operation was performed by displaying the position of the target table on the floating paper at intervals of a predetermined time (usually 6 minutes). During the voyage, To perform calculations.

On the other hand, after the computer has appeared, these vector operations can be performed automatically. The radar that includes this automatic floating function (vector operation) is called "ARPA radar".

Generally, most large ships are equipped with ARPA radar, which can be used to automatically and automatically check the information on the timetable and to predict danger vessels. Specifically, the ARPA radar automatically displays the floating information on the screen numerically and graphically for all the objects on the sea, so that the accurate movement of the opponent ship can be grasped immediately. Therefore, collision prediction and identification of dangerous vessels are possible, and large-sized vessels are capable of automatic steering using such ARPA radar.

In other words, large vessels can prevent accidents in the marine environment by using the ARPA radar 's ability to capture nearby vessels, track trail, track motion prediction, historical navigation, and collision risk warning .

However, 80% of marine accidents occur in small vessels and fishing vessels, and a fundamental solution is needed to reduce such marine accidents. Most of the accidents are caused by the complicated traffic volume port where large vessels are operated, complicated waterways, nighttime, ) Most of the factors due to external environment are due to sea.

As described above, the ARPA radar of a large ship can capture collision predictions by simultaneously capturing about 40 marks on the periphery. However, in the case of a small-sized ship radar, there is no tracking function for surrounding objects, Of the respondents.

Therefore, if the ARPA function is implemented using a radar mounted on a small ship, it will be possible to prevent accidents in the marine environment through the function of catching the target, tracking the target, tracking the target motion, . In this background, it is urgently required to develop a digital radar system that can be easily mounted on a small ship and implement ARPA.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a digital radar system for linking an FMCW radar with an inexpensive RSC board capable of implementing ARPA in a pulse radar.

According to an aspect of the present invention, there is provided a pulse radar and an FMCW radar installed in a small ship according to the present invention. An RSC (Radar Scan Converter) board for converting and storing image data low-scanned in the pulse radar into digital information; A smart mobile device operating in a ship network environment and expressing the radar information in a mobile environment; An ARPA function performing unit for performing ARPA processing by processing spoke information transmitted from the FMCW radar and digital information provided from the RSC board; And a display device for displaying the radar information provided by the RSC board and the ARPA function performing unit on the screen.

In the present invention, it is preferable that the RSC board samples analog image data (Raw Data) of the pulse radar at 60 MHz or more, digitizes an image according to azimuth data, and stores the digitized data in a storage unit.

Also, in the present invention, the ARPA function performing unit preferably includes a spoke information processing unit for analyzing spoke information composed of Trigger / Bearing / Heading / Video of the FMCW radar data to complete a radar image PPI (Plan Position Indicator).

In the present invention, it is preferable that the smart mobile device is provided with a mobile radar app for expressing radar information in a smart mobile device.

According to the digital radar system of the present invention, it is possible to supply a radar having a high-performance ARPA function at a low cost to a small fishing boat and a leisure boat, thereby preventing marine accidents such as a ship collision and assisting safe navigation. In addition, the digital radar system of the present invention can be used as an MFD in conjunction with an electronic chart and a fish finder, and can be operated in a smartphone or a tab as a mobile app.

Fig. 1 is an ARPA radar screen in which a conventional radar plotting shout and the orientation and orientation of a table are indicated.
2 is a block diagram of a compact digital radar system having an ARPA function according to an embodiment of the present invention.
3 is a diagram showing a configuration of an RSC board according to an embodiment of the present invention.
4 is a diagram illustrating a signal flow of an RSC board according to an embodiment of the present invention.
5 is a block diagram of an A / D converter according to an embodiment of the present invention.
6 is a timing chart of a Sync Burst SRAM according to an embodiment of the present invention.
7 is a logic diagram of a Sync Burst SRAM in accordance with an embodiment of the present invention.
Figure 8 is a logic diagram of a PCI 9054 in accordance with an embodiment of the invention.
9 is a block diagram showing a configuration of an ARPA function performing unit according to an embodiment of the present invention.
Fig. 10 is a view showing a configuration of a general radar spoke.
11 is a view of completing a PPI with a combination of radar spokes according to an embodiment of the present invention.
12 is a conceptual diagram of image processing steps according to an embodiment of the present invention.

Hereinafter, a specific embodiment of the present invention will be described in detail with reference to the accompanying drawings.

The small digital radar system having the ARPA function according to the present embodiment may include a pulse radar, an FMCW radar, an RSC board, an ARPA function performing unit, a display device, and a smart mobile device, as shown in FIG. .

First, the pulse radar and the FMCW radar are mounted on a small ship, and generally available products are commercially available, so a detailed description thereof will be omitted.

Next, the RSC board is a component for converting and storing image data low-scanned in the pulse radar into digital information. In this embodiment, the RSC (Radar Scan Converter) board may have a configuration as shown in FIG. Accordingly, the RSC board samples analog image data (Raw Data) of the pulse radar at 60 MHz or more, digitizes the image according to the azimuth angle data, and stores the digitized data in a memory. On the RSC (Radar Scan Converter) board, a radar data processor PCI board is used and radar images such as rain noise, sea clutter, and gain are adjusted to the surrounding environment by using an improved firmware for moving image extraction and observation functions Firmware can be installed which can accurately detect moving objects.

The operation of the RSC board is as shown in FIG. 4 and will be described in detail below.

First, as shown in FIG. 4, a video signal is set. When a video signal is input to the radar data processor, the signal level is appropriately adjusted to be within the A / D converter input range, where the gain applies the value transmitted from the radar data processor configuration program. When the gain setting is completed, the offset of the video signal is adjusted and finally input to the A / D converter.

Next, the A / D converter synchronizes the video signal to 25 MHz and converts it into a digital signal. The output port supports 14bit parallel processing and can sample up to 65MHz. The encoder signal uses a transformer to block noise. The configuration of the A / D converter in this embodiment is as shown in FIG.

Next, the Sync Burst SRAM has a logic diagram as shown in FIG. 7, and is an SRAM in which data input / output occurs based on Clock. Sync Burst SRAM for radar data processor There are several kinds of CYPRESS and MICRON SRAM, and data input / output is performed in 32 bit units.

In burst transfer of continuous high-speed transmission, only the data is transmitted in synchronization with the clock in a state in which the address does not increase after one address output. When the clock is 33 MHz, the maximum transfer rate is 132 MByte / sec since 32-bit data is transmitted synchronized with each clock. FIG. 6 is a timing chart of the Sync Burst SRAM. In this Timing Chart, data is output in a state in which the address does not increase after address output.

In addition, PCI devices that are designed to meet PCI bus specifications are divided into necessary pins and optional pins, and the complexity of the design is very high because there are many things to consider in designing the circuit considering all the requirements of the PCI bus specification . Therefore, in the radar data processor according to the present embodiment, the PCI9054 chipset provided by PLXTech as ASIC is used, and the chipset has a built-in DMA channel. The PCI 9054 has a logic diagram as shown in FIG. 8, and it is possible to set different hardware modes by combining the 157-pin and 156-pin, which are self-external pins, in hardware. The PCI9054 can be set to M, J, or C mode. The radar processor is configured in C mode to use the DMA function and controls it with the bus control signal.

Next, the ARPA function performing unit processes spoke information transmitted from the FMCW radar and digital information provided from the RSC board to perform an ARPA function. Specifically, in the present embodiment, the ARPA function performing unit may have a configuration as shown in FIG. The function setting software of the ARPA function performing unit is largely divided into three functions, which are Data Recorder, Oscilloscope, and Plan Position Indicator. Function setting software is configured to input and read GUI-based setting values. These commands are transmitted through the PCI interface as a predefined protocol.

That is, in the present embodiment, the ARPA function performing unit analyzes spoke information composed of Trigger / Bearing / Heading / Video of the FMCW radar data as shown in FIG. 10 and outputs the radar image PPI And a spoke information processor for completing the Plan Position Indicator.

Here, the Trigger Signal (or PRF: Pulse Repetition Frequency) starts from the center point of the PPI CRT, which is a radar display device, and sweeps in a clockwise direction. At each moment, a line is drawn from the center of the display to the outside, The point corresponding to the length of the line is the distance from the position of the observation point, the center point of the display is the starting point of the trigger, and the frequency of the trigger is usually PRF.

Next, Bearing Signal (or ACP: Azimuth Change Pulse) refers to a pulse corresponding to the direction of the actual antenna. In general, this is how much Resolution is required to display a mark on the display device. In order to display a table at every 0.1 degree, 3600 pieces of antenna direction information are required, and the corresponding position pulse is ACP. 1024 and 2048 are mainly used, and the unit quantity is the number of pulses per one rotation of the antenna.

Next, the Heading Signal (or ARP: Azimuth Reference (or Reset) Pulse) is also referred to as the Ship Heading Mark and refers to the starting point of the ACP. It corresponds to one time per rotation of the antenna and coincides with the bow direction of the ship.

Finally, the video signal is the most important signal in the radar and is an analog signal that must be processed at high speed by the radar data processor. This signal is transmitted in the Trigger signal (usually 8 to 12.5 GHz). That is, it is a carrier signal. When the transmitted signal is reflected by the object and the antenna is received, it includes signal noise such as sea clutter which is not needed at the time of ordinary navigation. However, by adjusting the gain and resolution, we can obtain radar image information Can be extracted. This video signal has a different voltage range depending on the radar manufacturer and model.

As shown in FIG. 12, the image processing step in the spoke information processing unit is subjected to steps such as grayscale conversion, Gaussian filter, binarization, labeling, and the like.

Next, in the present embodiment, the display device is a component for displaying the radar information provided by the RSC board and the ARPA function performing unit on the screen. The display device may be an Android-based 8-12 inch LCD display device.

As shown in FIG. 2, the smart mobile device operates in a shipboard network (SAN) environment and represents the radar information in a mobile environment. That is, the smart mobile device is provided with a mobile radar app for expressing radar information on a smart mobile device, so that radar image information can be received while the mobile device is on the move, so that radar data can be confirmed.

100: A compact digital radar system having an ARPA function according to an embodiment of the present invention
110: Pulse radar 120: FMCW radar
130: RSC board 140: display device
150: Smart mobile device

Claims (4)

Pulse radar and FMCW radar installed on small ships;
An RSC (Radar Scan Converter) board for converting and storing image data low-scanned in the pulse radar into digital information;
A smart mobile device operating in a ship network environment and expressing the radar information in a mobile environment;
An ARPA function performing unit for performing ARPA processing by processing spoke information transmitted from the FMCW radar and digital information provided from the RSC board;
And a display device for displaying the radar information provided by the RSC board and the ARPA function performing part on a screen. The RSC board according to claim 1,
Sampling the analog image data (Raw Data) of the pulse radar at 60 MHz or more, digitizing the image according to the azimuth angle data, and storing the digitized data in a storage unit. 3. The apparatus of claim 2, wherein the ARPA function performing unit comprises:
And a spoke information processor for analyzing spoke information composed of Trigger / Bearing / Heading / Video of the FMCW radar data to complete a radar image PPI (Plan Position Indicator). The smart mobile device of claim 1,
A small radar system having an ARPA function, characterized in that a mobile radar app for representing radar information on a smart mobile device is installed.

Images