Detection and tracking radar, anti high speed mobile defense system having the same and high speed mobile tracking method of detection and tracking radar

• US 9,151,836 B2
• Filed: 07/29/2011
• Issued: 10/06/2015
• Est. Priority Date: 04/19/2011
• Status: Active Grant

• Current Assignee: Agency For Defense Development (Government of The Republic of China)
• Original Assignee: Agency For Defense Development (Government of The Republic of China)
• Inventors: Lee, Jong-Min, Sun, Sun-gu, Cho, Byunglae, Lee, Jungsoo, Park, Sangsoon, Kang, Youn Sik
• Primary Examiner(s): BYTHROW, PETER M
• Application Number:
  US13/579,149
• Publication Number:
  US 20130027242A1
• Time in Patent Office: 1,530 Days
• Field of Search: 342 13- 20, 342/22, 342/27, 342/28, 342 89- 97, 342/104, 342/107, 342/109, 342/113, 342/115, 342/118, 342/123, 342/140, 342/146, 342/147, 342/175
• US Class Current: 1/1
• CPC Class Codes: G01S 13/726 Multiple target tracking
• CPC Class Codes: G01S 13/87 Combinations of radar systems, e.g. primary radar and secondary radar
• CPC Class Codes: G01S 7/292 Extracting wanted echo-signals
• CPC Class Codes: G01S 7/295 Means for transforming co-ordinates or for evaluating data, e.g. using computers

Abstract

A detection and tracking radar includes a hazardous zone set within a preset radius based on a main body having a radar, a plurality of detection and tracking sectors configured to detect a high speed mobile approaching the main body within detection areas, the detection areas being defined by diving the hazardous zone based on an azimuth angle, and a controller configured to recognize the high speed mobile as a target based upon signals received from the detection and tracking sectors and track the target. Accordingly, rapid detection and tracking of the high speed mobile can be allowed. Also, since the detection and tracking sectors can be independently run, expansion of a radar system can be free by virtue of addition of the detection and tracking sectors.

Claims

1. A detection and tracking radar comprising:

a hazardous zone set within a preset radius based on a main body having a radar;

a plurality of detection and tracking sectors configured to detect a high speed mobile approaching the main body within detection areas, the detection areas being defined by diving the hazardous zone based on an azimuth angle; and

a controller configured to recognize the high speed mobile as a target based upon signals received from the detection and tracking sectors and track the target,

wherein each of the detection and tracking sectors comprises;

a transmit antenna unit and a transmitting unit configured to radiate a Continuous Wave (CW) or Linear Frequency Modulation (LFM) type waveform signal; and

a receive antenna unit and a receiving unit configured to receive the waveform signal reflected from the high speed mobile,

wherein the transmit antenna unit, the receive antenna unit, the transmitting unit and the receiving unit are integrally formed for each detection and tracking sector,

wherein the controller comprises;

a window module configured to generate burst data by multiplying a signal received from each detection and tracking sector by a preset window function;

a frequency conversion module configured to perform a Fast Fourier Transformation (FFT) with respect to the burst data;

a Constant False Alarm Rate (CFAR) module configured to detect a signal exceeding a preset threshold value, of signals input from the frequency conversion module, the threshold value set to have a specific false alarm rate;

a detection module configured to recognize the signal input from the CFAR module as a target high speed mobile when the signal input from the CFAR module meets a preset condition; and

a coordinate conversion module, wherein when the target high speed mobile moves from a first detection and tracking sector, in which the target high speed mobile has been recognized, into a second detection and tracking sector, the coordinate conversion module is configured to convert a polar coordinate system of the second detection and tracking sector into a polar coordinate system of the first detection and tracking sector and subsequently convert the polar coordinate system of the first detection and tracking sector into an orthogonal coordinate system of the detection and tracking radar, for continuity of the movement information relating to the high speed mobile.

2. The radar of claim 1, wherein the transmitting unit comprises:

a transmitter configured to generate the waveform signal; and

a transmit switch configured to switch on or off transmission of the waveform signal with respect to each elevation angle section, defined by dividing an elevation angle into at least two elevation angle sections within each detection area.

3. The radar of claim 2, wherein the transmit antenna unit comprises transmit antennas configured to radiate the waveform signal with respect to each of the divided elevation angle sections.

4. The radar of claim 2, wherein the receiving unit comprises:

a receiver configured to amplify or convert a signal received from the receive antenna unit; and

a receive switch configured to switch on or off an operation of each receive antenna constructing the receive antenna unit, in correspondence with the switching of the transmit switch.

5. The radar of claim 4, wherein the receive antenna unit comprises:

a first antenna group and a second antenna group, configured to acquire information relating to movement of the high speed mobile in an elevation angle direction and information relating to movement of the high speed mobile in an azimuth angle direction, respectively, by receiving the waveform signal reflected from the high speed mobile.

6. The radar of claim 4, wherein the receive antenna unit comprises:

a first antenna group configured to receive the waveform signal reflected from the high speed mobile upon transmission of the waveform signal in a first direction; and

a second antenna group configured to receive the waveform signal reflected from the high speed mobile upon transmission of the waveform signal in a second direction, the second direction different from the first direction.

7. The radar of claim 5, wherein each of the antenna groups comprises a plurality of antennas disposed by being spaced apart from one another and configured to acquire information relating to movement of the high speed mobile in an elevation angle direction or an azimuth angle direction according to the principle of a radio interferometer system.

8. The radar of claim 1, wherein the controller further comprises a tracking module configured to operate signals input from the detection module to extract movement information relating to the target high speed mobile when the detection module recognizes the target high speed mobile.

12. The radar of claim 6, wherein each of the antenna groups comprises a plurality of antennas disposed by being spaced apart from one another and configured to acquire information relating to movement of the high speed mobile in an elevation angle direction or an azimuth angle direction according to the principle of a radio interferometer system.

9. A method for tracking a high speed mobile in a detection and tracking radar comprising:

receiving a Continuous Wave (CW) or Linear Frequency Modulation (LFM) type reflection signal for each of detection and tracking sectors, divided in plurality;

generating burst data by multiplying the received signal by a preset window function;

generating a frequency conversion data by performing a Fast Fourier Transformation (FFT) with respect to the burst data;

detecting data exceeding a preset threshold value from the frequency conversion data, the threshold value set to have a specific false alarm rate;

recognizing the detected data as a target when the detected data meets a preset condition; and

when the target high speed mobile moves from a first detection and tracking sector, in which the target high speed mobile has been recognized, into a second detection and tracking sector, converting a polar coordinate system of the second detection and tracking sector into a polar coordinate system of the first detection and tracking sector and subsequently converting the polar coordinate system of the first detection and tracking sector into an orthogonal coordinate system of the detection and tracking radar, for continuity of the movement information relating to the high speed mobile.

10. The method of claim 9, further comprising multiplying a preset function by signals input from the target high speed mobile, performing a frequency conversion and extracting movement information relating to the high speed mobile.

11. A high speed mobile defense system comprising:

a main body;

a hazardous zone defined within a preset radius based upon the main body;

a plurality of detection and tracking sectors configured to detect a high speed mobile approaching the main body within detection areas, the detection areas being defined by diving the hazardous zone based on an azimuth angle; and

a controller configured to recognize the high speed mobile as a target based upon signals received from the detection and tracking sectors and track the target,

wherein the controller comprises a coordinate conversion module, wherein when the target high speed mobile moves from a first detection and tracking sector, in which the target high speed mobile has been recognized, into a second detection and tracking sector, the coordinate conversion module is configured to convert a polar coordinate system of the second detection and tracking sector into a polar coordinate system of the first detection and tracking sector and subsequently convert the polar coordinate system of the first detection and tracking sector into an orthogonal coordinate system of the detection and tracking radar, for continuity of the movement information relating to the high speed mobile.