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为使星载激光高度计实现高空间分辨力、高距离精度,提出了联合采用调频光纤激光器和相干测距的方法。详细讨论了这种方法的实现方案,并对方案中的激光发射功率、望远镜口径以及脉冲宽度对距离精度及信噪比的影响进行数值模拟。对系统参量进行分析,得到了相关参量的关系和优化的参量。结果表明,当望远镜口径为400 mm时,啁啾调频速率为1 MHz/μs,脉冲时间宽度150~350μs,发射功率10 W左右时,基于相干测距的星载激光高度计可以实现距离精度小于15 cm的技术指标。
In order to realize high spatial resolution and high-range precision of spaceborne laser altimeter, a combined method of using frequency-modulated fiber laser and coherent distance measurement is proposed. The realization scheme of this method is discussed in detail, and the effects of laser transmitting power, aperture of telescope and pulse width on distance accuracy and signal-to-noise ratio are numerically simulated. The system parameters are analyzed, the relationship between the parameters and the parameters are optimized. The results show that when the telescope aperture is 400 mm, the chirp FM is 1 MHz / μs, the pulse duration is 150 ~ 350 μs and the transmit power is about 10 W. The spaceborne laser altimeter based on coherent distance measurement can achieve a distance accuracy less than 15 cm technical indicators.