Abstract：MANPACK DGPS System is a new product which was put into market in April, 1993 by French Sercel corporation. It was specially designed for quick 2D, 3D and slalom line seismic surveys. Its real time accuracy is better than 1m, and the postprocessing accuracy is 40~50cm. The system consists of①a portable ND5200 reference station for transmitting differential correction signals;②portable intellect differential&GPS integrated receiver,which has a single GPS/HF antenna, movahle memory card，built-in compass and QC function in real time;and③a PC486 computer for seismic layout design, postprocessing and quality control. Both the accuracy and the productivity of 3D seismic survey using this system have been proved in field work.
