To Resolve The Doppler-sensitive Prc-cw Transceiver Front-end Research

Pseudo-Random Code CW (PRC-CW) radar process unique advantages on LPI and antijamming.But it is Doppler sensitive while The ambiguity function resembles more of a thumbtack shape . When the target speed increased, the correlation detection shows sidelobe problem Increased , resulting in performance degradation of the target detection, even for hard-to-detect high-speed targets, thereby limiting the radar target detection in high-speed applications.To suppress the Doppler sensitivity of pseudo random code continuous wave (PRC-CW) radar signal,this thesis analyzes the impact of doppler tolerance of the various factors and presente a novel method. The novel hybrid transmitted waveform used in this radar combining single frequency pulse with pseudo random binary phase-coded signal is presented which makes consequent target detection through pulse compression independent of Doppler frequency. Doppler frequencies of targets are firstly estimated based on interpolated FFT in the time span of single frequency pulse and the Doppler compensated signal can be constructed. The effect of Doppler mismatch on the correlation detection can be eliminated by processing the compensated signal using conventional pulse compression-FFT, which makes the radar capable of short-range high-speed target detection.The theoretical analysis and simulation result demonstrate the validity of this technique. The use of hardware design code generator to generate the new waveform, indicating that this method can be feasible .According to the principles,the paper design a phase modulation which works at 1.03GHz,the final results of the test are given.