NT-QISN Dither process time domain data

High-precision, high-resolution ultra-deep field astronomical observations are essential for detecting special celestial bodies and extremely rare astronomical events. Space astronomical telescopes can achieve this by employing the fine image stabilization system (FISS) to generate line-of-sight (LOS) dithering, enabling scientific instruments to obtain higher-resolution astronomical images through resampling and fusion algorithms. To meet the requirement for sub-pixel dithering control in the FISS of space telescopes, an adaptive control algorithm based on a single neuron is proposed. This algorithm dynamically adjusts controller parameters in response to complex environmental disturbances. It enhances low-frequency disturbance suppression while avoiding the amplification of disturbance amplitudes at the resonant frequency, thereby addressing a critical challenge in the design of fine image stabilization systems. The design ensures that the telescope's LOS stability meets the requirement of 5.43 µm (3σ) while achieving high-precision pointing. Additionally, to mitigate overshoot and oscillation issues caused by dithering control, a nonlinear tracker is introduced to achieve rapid tracking without overshoot. The ground test results demonstrate that after four ditheringstabilization, the FISS achieves a composite mean error of two-dimensional pointing better than 0.005 µm, a LOS stability better than 4.41 µm (3σ) within the 0–8 Hz frequency range, and a disturbance suppression ratio exceeding 96%.