Fig. 1. Structural diagram of spot position detection system

Fig. 2. Detection principle of four quadrant detector

Fig. 3. Absolute errors of solution results of second-order error compensation algorithm and correction algorithm

Fig. 4. Absolute errors of solution results of improved algorithm and second-order error compensation algorithm

Fig. 5. Hardware principle block diagram of signal synchronous acquisition and processing of four quadrant detector

Fig. 6. Hardware physical diagramof multi-channel synchronous acquisition circuit of high repetition frequency narrow pulse signal

Fig. 7. Physical diagram of test platform

Fig. 8. Comparison of absolute error of spot position detection between second-order error compensation algorithm and second-order extended error compensation algorithm