Abstract:
The present invention relates to a forward-looking imaging radar and, more specifically, to a method for improving image quality of a forward-looking imaging radar, which is capable of improving azimuth resolution in the forward-looking imaging radar and simultaneously suppressing side robes. According to the present invention, azimuth resolution can be improved without a repeated process while improving a side robe level.
Abstract:
PURPOSE: A failure position detecting device for a cable is provided to detect the length and position of a failure of a cable regardless of the balance, the buried state, and the shape of the cable. CONSTITUTION: A failure position detecting device comprises: a pulse generator(110), a transceiver(130), a pulse mixer(150), and a signal processor(190). The pulse generator generates the first pulse signal. The transceiver transmits the first pulse signal generated by the pulse generator to a cable and receives the second pulse signal reflected by and returning from the cable. The pulse mixer outputs the third pulse signal by using the first and the second pulse signals. The signal processor processes the power and the length of the cable by using the third pulse signal and detects failure positions of the cable by using the length and the power of the cable. [Reference numerals] (110) Pulse generator; (130) Transceiver; (150) Pulse mixer; (190) Signal processor; (200) Cable
Abstract:
PURPOSE: Detection tracing radar, a high-speed moving object defending system including the same, and a high-speed moving object tracing method of the detection tracing radar are provided to maintain the continuity of information about a high-speed moving object passing through plural detection tracing sectors. CONSTITUTION: A danger area(400) includes a fixed radius with a main body(100) as the center. Radar is installed to the main body. A plurality of detection tracing sectors(110a~110c) divides the danger area into detection areas(410a~410f) based on azimuth. The detection tracing sectors detects high-speed moving object(500) approaching the main body in the detection areas. A control unit recognizes the high-speed moving object as a target based on signals received from the detection tracing sectors. The control unit traces the high-speed moving object.
Abstract:
The present invention relates to a compensation apparatus of an array antenna in a radar system and a method thereof capable of performing compensation of the array antenna in the radar system installed at an arbitrary location, and preventing a transmitting and receiving beam to be distorted. The compensation method of the array antenna therein according to an embodiment of the present invention comprises the steps of: transmitting a transmission signal from a transmission array antenna; receiving the transmission signal as four reference reception antennas among a received array antenna; and compensating the transmission array antenna as a result of a difference value of an initial compensation data and the transmission signal which are received as four reference reception antennas.
Abstract:
PURPOSE: A wall penetration radar imaging method and apparatus are provided to obtain a three-dimensional image of a subject including a product or a man located behind a shelter. CONSTITUTION: An imaging apparatus comprises a transmitter(10), a receiver(20), and a signal processing unit(30). The transmitter transmits a transmission signal which is created based on a noises signal. The receiver arranges one or more antenna elements in a first direction. The signal processing unit calculates correlation of a reception signal and a sending and receiving signal. The signal processing unit calculates distance information of a subject based on the correlation. The signal processing unit calculates angular information of the subject based on phase information of the reception signal received through each antenna element. The signal processing unit obtains imaging information for the subject based on the distance information and the angular information. [Reference numerals] (10) Transmitter; (20) Receiver; (30) Signal processing unit; (40) Transmission antenna; (50) Receiving antenna
Abstract:
본 발명은 주파수 변조 연속파(FMCW) 레이다에서 간섭 제거를 위한 시스템간 동기화 방법에 관한 것으로, (a) 2대의 레이더가 동시에 운용될 경우 간섭유무를 판단하기 위해 시간 영역에서 셀 평균-일정오경보확률(CA-CFAR) 알고리즘을 사용하여, 기준 레이다에 동기를 맞추고자 레이다로부터 동기화 명령이 발생하면, 연속파-선형 주파수 변조(CW-LFM) 파형으로 변경하고, 레이다 신호를 획득하여 레이다에 수신된 신호를 시간 영역 CA-CFAR를 사용하여 간섭 유무를 판단하는 단계; (b) 연속파(CW) 구간에서 간섭이 발생했을 경우, 레이더 시스템간 동기화하는 단계; (c) 주파수 변조(LFM) 구간에서 간섭이 발생했을 경우, 레이더 시스템간 동기화하는 단계; (d) 간섭 발생이 탐지되지 않았을 경우, 동기화하는 단계; 및 (e) 동일한 타입 레이다간 동기화가 완료되면, 파형 발생기를 제어하여 원래 파형으로 복귀하는 단계를 포함한다. 본 발명은 주파수 변조 연속파(FMCW) 신호를 이용한 레이다에서 간섭 신호를 인지하고, 강제 시간 지연 및 주파수 호핑을 통해 장비간 비동기 시간을 계산하여 보정함으로써 레이다 장비간 동기를 맞추고 동기화 작업이 완료되면 전원을 끌 때까지 레이다간 간섭 신호를 제거하며, 장비의 동시 운용성을 높여준다.
Abstract:
PURPOSE: An apparatus for detecting a FMCW(Frequency Modulated Continuous Wave) radar and a detecting method thereof are provided to accurately detect the target of a long distance and miniature and the target of a long distance and low speed by controlling a waveform according to the distance of, the speed, and the size of an approaching target. CONSTITUTION: An FMCW radar detecting apparatus(100) comprises a CW(Continuous Wave) signal generator(110), a RF(Radio Frequnecy) transmitter(120), a RF receiver(130), a target detecting part(140), a modulation controller(150), and an CW-LFM(Continuous Wave-Linear Frequency Modulation) signal generator(160). The CW signal generator generates a preset CW signal and transmits a CW signal through the RF transmitter. The target detecting part receives the CW signal through the RF receiver. The approaching target is detected using a beat frequency which corresponds to the frequency difference of a received CW signal and a transmitted CW signal. The modulation controller produces the speed and the distance of the approaching target. A modulation bandwidth is set according to calculated speed and distance. The CW-LFM signal generator generates a CW-LFM signal which a preset modulation bandwidth is applied to. A generated CW-LFM signal is transmitted through the RF transmitter.
Abstract:
A radar interferometer and a method for estimating a target position are provided to estimate a target distance and a target incident angle from a radar to the target by using phase information of a signal received at an antenna. An antenna unit(200) includes a first antenna combination(110), a second antenna combination(120), a third antenna combination(130) and a fourth antenna combination(140). The first antenna combination and the second antenna combination are arranged with different intervals by using two antennas in an x axis in a three dimensional space. The third antenna combination and the fourth antenna combination are arranged in parallel with different intervals by using two antennas in a y axis in a three dimensional space. A position estimating unit is connected to the antenna unit. The position estimating unit estimates respective incident angles of the x axis and the y axis and the target distance.