Maintenance method of signal coherence in lidar and experimental validation

Abstract

According to the self-heterodyne signal obtained by lidar under different fiber delay times, the model of the local oscillator signal was established, and the maintenance method of signal coherence in lidar based on the digital delay was improved by using multiple sinusoidal frequency modulation components. An imaging detection experiment was carried out at a distance of 5.4 km. The coherence of the lidar signal was maintained by combining the transmitting reference channel correction method and the local oscillator reference channel compensation method, accompanied by the use of a phase spectrum to analyze the improvement effect. The processing results of the echo signal showed that the method could remove the high-order phase errors that cannot be compensated by the phase gradient autofocus algorithm and improve the signal coherence, which could be used for the detection and imaging of long-range targets.

Imaging and detection method for low signal-to-noise ratio airborne synthetic aperture ladar signals

“…The matched filter is constructed with the transmitted reference signal and matched with the echo signal in the fast-frequency domain to realize the correction of nonlinear phase in the echo signal 11 , 12 . Since the single-pulse SNR of the echo signal after correction is still low, the time–frequency analysis method can be used for data browsing, and the signal duration and time segment can be estimated from the time–frequency analysis results.…”