双基地多载频FMCW雷达目标加速度和速度估计方法

Acceleration and Velocity Estimation of Targets in Bistatic Multi-Frequency FMCW Radar

双基地多载频FMCW雷达采用稀布阵发射多载频FMCW(Frequency Modulated Continuous Wave)信号,阵列接收目标回波。受速度和加速度的调制,机动目标回波多普勒频谱展宽,导致雷达检测性能下降。该文分析了双基地多载频FMCW雷达的信号模型,提出将多项相位变换和相位差法结合来实现目标加速度和速度高精度估计的方法。分析了该方法在不同数据分段情况下的性能。仿真结果表明,该方法能够以较小的运算量对目标加速度和速度进行高精度估计。

The bistatic multi-frequency FMCW radar uses sparse-array to transmit the FMCW signals of multiple carrier frequencies, and an array to receive the echoes. The Doppler spectrum is widened because the Doppler signals are modulated by acceleration and velocity of maneuvering target, which leads to the degeneration of radar＇s detection performance. The signal model of bistatic multi-frequency FMCW radar is analyzed in this paper. A method using Discrete Polynomial-phase Transform（DPT） and phase difference is presented to obtain the high-accuracy acceleration and velocity estimation of target. The performance of the proposed method is analyzed when the data is divided into different segments. The simulation indicates that the method can obtain a high-accuracy estimation of both acceleration and velocity with a small computational complexity.