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首页> 外文会议>14th Coherent Laser Radar Conference >Chirped Amplitude Modulation Continuous Wave (AM-CW) Ladar for 3D Imaging and Doppler Tracking
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Chirped Amplitude Modulation Continuous Wave (AM-CW) Ladar for 3D Imaging and Doppler Tracking

机译：3调幅连续波（AM-CW）激光雷达，用于3D成像和多普勒跟踪

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摘要

Radars have used the frequency modulation -continuous wave (FM-CW) waveform for range and Doppler measurements for about 60 years. With the advent of narrow line width lasers in the 1960's, the FM-CW waveform has been used for coherent laser radar for over 40 years. The first and still the most widely used FM-CW waveform is the linear FM-CW waveform for which the frequency of the carrier is swept from a low (high) frequency to a high (low) frequency linearly with time to form a waveform known as an up-(down-) chirp. Both coherent detection and direct detection ladars utilizing amplitude modulation - continuous wave (AM-CW) waveforms with the modulation being at a single frequency (aka a single tone) or at a number of discrete frequencies (aka multi-tone) had been employed prior to and during the 1990's. When used with direct detection, the single frequency AM-CW waveform is generally used with a receiver that measures the phase difference between the outgoing waveform and the received return waveform to determine the range to a target. This measurement can produce excellent range precision, but produces erroneous results for two or more targets at different ranges within a single pixel. The use of multiple frequencies helps to distinguish between multiple targets, but is limited in the number and spacing of the targets that can be distinguished.
机译：大约60年以来，雷达一直使用调频连续波（FM-CW）波形进行距离和多普勒测量。随着1960年代窄线宽激光器的问世，FM-CW波形用于相干激光雷达已有40多年的历史了。 FM-CW波形是第一个也是使用最广泛的波形，线性FM-CW波形的载波频率随时间从低频（高频）扫描到高频（低频），形成已知的波形作为向上（向下）chi。利用幅度调制-连续波（AM-CW）波形的相干检测雷达和直接检测激光雷达，其调制是在单个频率（也称为单音）或在多个离散频率（也称为多音）上进行的，直到1990年代。当与直接检测一起使用时，单频AM-CW波形通常与接收器一起使用，该接收器测量输出波形和接收的返回波形之间的相位差以确定目标范围。此测量可以产生出色的范围精度，但对于单个像素内不同范围的两个或多个目标，会产生错误的结果。使用多个频率有助于在多个目标之间进行区分，但是可以区分的目标数量和间隔受到限制。

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