A research on synthesis processing of Orthogonal Array Radar based on Non-linear Frequency Modulated signals

Orthogonal array radar OAR is a new radar system. This paper introduces the principles of the OAR. Since the array elements of the OAR transmit orthogonal signals in the omni-direction at the same time, after the signals in different channels are received, the signal synthesis can form the transmitting beam and obtain a narrow pulse. If each transmitting signals are single frequency signals and the multiplied product of the time width T of the transmitted signals and the frequency interval Deltaf between each signal is larger than 1, the distance grating lobe will occur after the signal synthesis. To reduce sidelobe level, increase the ratio of mainlobe and sidelobe (RMS) and eliminate the distance grating lobe effectively, the method using the non-linear frequency modulated (NLFM) signal as the transmitting signal is presented in this paper. The analysis result shows that this method is effective to solve these problems.