Study on the Dual Camera Photogrammetry and Signal Process in Photoelectric Landing Guidance System

In this paper, we designed a photoelectric guidance system for helicopter landing and recovery. Two infrared CCD cameras were used to image the four beacons lighted by semiconductor lasers on both sides of the helicopter. The beacon position and attitude were extracted by image process and target identification. Using the dual camera photogrammetry(DCP) model established, the real-time helicopter coordinates were calculated relative to the landing point. Using the high performance DSP system, two channel of image signal were collected, detected and tracked in real time and the experimental results were displayed. The hardware-in-the-loop experiment shows that the measurement accuracy of distance can reach plusmn5 cm and the measurement accuracy of angle can reach plusmn3degin the guidance system. The errors meet the accuracy requirements of safe landing for helicopters.