Abstract:
PURPOSE: A method and a device for recognizing a pulse repetition interval (PRI) modulation form using a support vector machine (SVM) are provided to minimize an error rate in pattern recognition. CONSTITUTION: A receiving part (10) senses a radar signal to process and deliver to a control part (20). The control part is classified into an SVM training module (22), an input data characteristic vector extracting module (24), a classification result value check module by SVM (26), and a PRI modulation form discrimination module (28) in order to implement a PRI modulation form recognizing method. The SVM training module extracts a feature vector to input to an SVM from training data and includes the extracted feature vector and a PRI modulation form value. The SVM training module classifies the input data to input to SVM and trains the SVM by modulation forms using the input data. The classification result value check module by SVM puts the feature vector into the SVM by modulation forms implemented by the SVM training module. The PRI modulation form discrimination module selects a SVM with the greatest value among discrimination result values, produces a result code according to the selected SVM number, and recognizes the PRI modulation form using the result code. [Reference numerals] (10) Receiving unit; (20) Control unit; (22) SVM training module; (24) Input data characteristic vector extraction module; (26) SVM classification result check module; (28) PRI modulation type classifying module
Abstract:
본 발명은 다채널 디지털 수신 방법 및 장치에 관한 것으로, 다수 개의 안테나로부터 수신되는 N(N은 4 이상의 자연수)개 이상의 RF 신호를 A/D변환하여 디지털 신호로 변환하는 AD 변환기(ADC); AD 변환기로부터 N개 채널에서 디지털 신호를 입력받아 채널별 신호의 전력(power) 측정 후, 그 정보를 이용한 수신 신호의 세기가 가장 큰 채널(Max 채널)과 2번째, 3번째 채널(Max 채널의 좌, 우 채널)의 수신 채널을 선택하는 Power 측정 및 채널 선택부; Power 측정 및 채널 선택부에 의해 선택된 Max 채널의 신호에서 내부 또는 외부 고정밀 시각정보를 이용하여 수신신호의 세기가 가장 큰 신호에 대해 수 ns 해상도를 갖는 TOA를 측정하는 고해상도 TOA 측정부; Power 측정 및 채널 선택부에 의해 선택된 Max, 2nd, 3rd 채널에서 channelizer 필터를 사용하여 신호의 주파수, 신호 세기, 펄스폭을 측정하고, phase detector로 신호의 위상을 측정하는 채널라이저/위상 검출기; 채널라이저/위상 검출기로부터 제공된 각 채널별 동일한 주파수에 해당하는 신호의 위상과 세기를 동시에 이용하여 AOA를 측정하는 AOA 측정부; 및 고해상도 TOA 측정부, 채널라이저/위상 검출기, 및 AOA 측정부에서 각각 측정된 결과를 조합하여 펄스 단위로 PDW를 생성하는 PDW 생성부를 포함하고, 4개 이상의 수신 안테나 신호로부터 고해상도 TOA 측정이 가능하고, 동시에 펄스단위로 신호의 PDW 생성이 가능하다.
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