Broadband correlation processing
Broadband correlation processing
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DOI：
10.1109/icassp.1983.1172261
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发表时间：
1983-04
期刊：
影响因子：
--
通讯作者：
G. Johnson;D. Ohlms;M. Hampton
中科院分区：
文献类型：
--
作者：
G. Johnson;D. Ohlms;M. Hampton
理论分析表明，与真实的（带通）相关器相比，复（包络）相关器有显著的损耗。这些损耗是由于载波相位信息的消除而引起的。检测损失可能超过5分贝。一种新的基带实现的真实的相关器减少了处理要求相对于经典的带通实现。当不存在延迟误差时，真实的和复相关器的多普勒损失是幅度相等的。多普勒损失强烈地依赖于信号中心频率、传感器间距和场景，而它们仅弱地依赖于信号带宽。通过在延迟空间中平移相关器输出以考虑延迟点在短相关器时间间隔上的运动，可以有效地补偿真实的相关器的多普勒。与前相关器多普勒响应相比，使用后相关器分段多普勒补偿之后进行相干积分节省了处理中的数量级（即，二维延迟/多普勒相关器）。
Theoretical analyses indicate significant losses for the complex (envelope) correlator versus the real (bandpass) correlator. These losses result from the elimination of carrier phase information. Detection losses can exceed 5 db. A novel baseband implementation of the real correlator reduces processing requirements relative to the classical bandpass realization. Doppler losses for the real and complex correlator are magnitude equivalent when there are no delay errors. Doppler losses depend strongly on signal center frequency, sensor spacing, and scenario, whereas, they are only weakly dependent on signal bandwidth. The real correlator can be effectively compensated for Doppler by translating the correlator outputs in delay space to account for the motion of the delay point over short correlator time intervals. Use of post-correlator piecewise Doppler compensation followed by coherent integration saves orders of magnitude in processing as compared to pre-correlator Doppler resampling (i.e., a 2- dimensional delay/Doppler correlator).