Abstract:
PURPOSE: A pulse repetition interval (PRI) modulation form recognizing method and a recognition apparatus applying the same are provided to easily automatize by simplifying an algorithm and to have low temporal complexity. CONSTITUTION: A PRI modulation form recognizing apparatus (200) comprises a chain code acquiring unit (210), a state transition probability matrix acquiring unit (220), a PRI modulation form separation factor acquiring unit (230), and a modulation form determining unit (240). The code acquiring unit obtains a chain code for an input pulse row. The state transition probability matrix acquiring unit obtains a state transition probability matrix based on the chain code. The PRI modulation form separation factor acquiring unit obtains a PRI modulation form separation factor based on the state transition probability matrix. The modulation form determining unit obtains an output result for a predetermined neural network based on the state transition probability matrix and the modulation form separation factor and determines a PRI modulation form based on the output result. [Reference numerals] (110) Signal receiving unit; (120) Signal processing unit; (200) Modulation form recognizing apparatus; (210) Chain code acquiring unit; (220) State transition probability matrix acquiring unit; (230) PRI modulation form separation factor acquiring unit; (240) Modulation form determining unit; (250) Nerve network discipline unit; (260) Nerve network processing unit
Abstract:
PURPOSE: A multi-channel digital reception method and an apparatus thereof are provided to be directly applicable to a TDOA based positioning system requiring a high definition TOA[Time of Arrival] measurement scalability. CONSTITUTION: An AD converter(100) converts four or more RF signals received from multiple antennas into digital signals. A power measurement and channel selection unit(200) selects a channel having a biggest reception signal and the reception channel of left and right thereof after receiving a multi-channel digital signal from the AD converter and measuring the power of the signal of each channel. A high definition TOA measuring unit(300) measures the TOA of the biggest reception signal by using the high precision visual data of inside or outside in the signal of the biggest reception signal. A channelizer/phase detector(400) measures a signal frequency, a signal strength, a pulse width, and a signal phase. An AOA(Angle of Arrival) measuring unit(500) measures an AOA by using the signal strength of each channel and a phase at the same time. A PDW generating unit(600) generates a PDW as a pulse unit by assembling the measured result and outputs the PDW to an external link device by storing in a fixed time or number. [Reference numerals] (200) Power measurement and channel selection unit; (300) High definition TOA measuring unit; (500) AOA measuring unit; (600) PDW generating unit
Abstract:
PURPOSE: A radar signal modulation type identification unit and a method thereof are provided to reliably identify NM, FSK, PSK, LFM and NLFM modulation types of a radar reception signal. CONSTITUTION: A generation unit(100) generates more than one I information and Q information by reading IQ from an analysis target PDW(Pulse Description Word) of a received radar signal. An identification unit(200) is connected with the generation unit and includes an NM identification unit(210), an FSK identification unit(230), a PSK identification unit(250) and an LFM identification unit(270). The identification unit identifies an NM modulation type of the received radar reception signal by applying FFT(Fast Fourier Transform) and STFT(Short Time Fourier Transform) to the generated I information and Q information. [Reference numerals] (100) Generation unit; (211) PBT calculation unit; (212) PBT dB calculation unit; (213) IQ processing unit; (214) Fc calculation unit; (215) NM identification unit; (231) G_C1 calculation unit; (232) G_C2 calculation unit; (233) FSK identification unit; (251) Kf calculation unit; (252) Pe setting unit; (253) Vt calculation unit; (254) PSK identification unit; (271) Noise processing unit; (272) Data generation unit; (273) Instantaneous phase difference calculation unit; (274) Instantaneous phase difference generation unit; (275) Maximum value index acquisition unit; (276) Minimum value index acquisition unit; (277) Pair calculation unit; (278) Template generation unit; (279) C_C12 calculation unit; (280) LFM identification unit
Abstract:
본 발명은 레이더 신호 탐지 기술에 관한 것으로서, 더 상세하게는 고밀도의 다중 레이더 신호 환경에서 그룹화된 각 그룹을 구성하는 펄스의 방위, 주파수 정보를 이용하여 입력데이터를 생성하고 마할라노비스 거리를 계산하여 이상치를 탐지하고 관리하는 방법에 대한 것이다. 본 발명에 따르면, 데이터의 분포 모양을 고려한 거리 척도인 마할라노비스 거리를 이용하여 레이더 신호에 대한 이상치 펄스를 탐지함으로써 이후 신호 분석 단계인 펄스열 분리의 성능을 향상시키는 것이 가능하다.