New Chirp Sequence Radar Waveform
New Chirp Sequence Radar Waveform
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DOI：
10.1109/taes.2014.120813
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发表时间：
2014-10-01
影响因子：
4.4
通讯作者：
Rohling, Hermann
中科院分区：
文献类型：
--
作者：
Kronauge, Matthias;Rohling, Hermann
汽车雷达应用的一般要求是，即使在多目标情况下，也要同时、明确、高精度、高分辨率地测量目标距离R和径向速度nu(R)，这是一个适当的波形设计问题。基于单一连续波啁啾发射信号，目标距离R和径向速度nu(R)无法明确测量。为此，提出了一种多频移键控（MFSK）发射信号，用于同时测量目标距离和径向速度。在这种情况下，雷达测量基于频率和相位测量，与纯频率测量相比，其估计精度较低。因此，这种MFSK波形可以通过啁啾序列波形进行改进和超越。在这种情况下，每个啁啾信号都具有非常短的持续时间t啁啾。因此，测量到的拍频f(B)主要受目标距离R的影响，而受径向速度nu(R)的影响较小。距离和径向速度估计基于两个独立的频率测量，在这两种情况下都具有很高的精度。经典的啁啾序列波形在速度测量中可能存在歧义。本文的目的是对经典的啁啾序列进行修正，使其在多目标情况下也能得到清晰的速度测量结果。
The general requirement in the automotive radar application is to measure the target range R and radial velocity nu(r) simultaneously and unambiguously with high accuracy and resolution even in multitarget situations, which is a matter of the appropriate waveform design. Based on a single continuous wave chirp transmit signal, target range R and radial velocity nu(r) cannot be measured in an unambiguous way. Therefore a so-called multiple frequency shift keying (MFSK) transmit signal was developed, which is applied to measure target range and radial velocity separately and simultaneously. In this case the radar measurement is based on a frequency and additionally on a phase measurement, which suffers from a lower estimation accuracy compared with a pure frequency measurement. This MFSK waveform can therefore be improved and outperformed by a chirp sequences waveform. Each chirp signal has in this case very short time duration T-chirp. Therefore the measured beat frequency f(B) is dominated by target range R and is less influenced by the radial velocity nu(r). The range and radial velocity estimation is based on two separate frequency measurements with high accuracy in both cases. Classical chirp sequence waveforms suffer from possible ambiguities in the velocity measurement. It is the objective of this paper to modify the classical chirp sequence to get an unambiguous velocity measurement even in multitarget situations.