Sar Single And Double Based Large-capacity Data Real-time Storage Technology Research And Implementation

Synthetic aperture radar (SAR) is an active microwave remote sensor.The high speed data acquisition and storage system,which is an important part of SAR system, must meets high sampling speed, large capacity, high speed Storage speed requirements because of SAR's high data rate, the volume of data, long time Storage.In order to satisfy imaging requirements, Data Acquisition and Storage System must acquire echoes data with high speed and store data in real-time. Because of the limitation of hardware, only the available echoes can be stored.In this paper, a method was used to detect the radar echoes by slide-window, the system which uses the mothod ensure the integrality and validity of data.Thers is a great deal of difference in SNR of echoes which come from different carrier. In view of different SNR situation, three kinds of algorithm for signal detecting were designed and realized in this paper.The slide-window detecting algorithm based on Neyman-Pearson rule was suitable for signal detecting wihich SNR is more than 6dB, and was used in Air Borne SAR data acquisition and storage system. The slide-window detecting algorithm based on wavelet transform was suitable for signal detecting wihich SNR is more than -10dB, he slide-window detecting algorithm based on pulse compression was suitable for signal detecting wihich SNR is more than -20dB, and both of them were used in satellite signal data acquisition and storage system. The data acquisition and storage system in airborne single and bistatic SAR designed and realized in this paper was validated in the car's and plane's experiments.The primary work in this dissertation:Three kinds of slide-window detecting algorithm were proposed in this paper,which were respective based on Neyman-Pearson rule,wavelet transform and pulse compression, and were suitable for signal with different SNR.They were proved both by theory and experiment result.The construction and design proposal of data acquisition and storage system in airborne single and bistatic SAR was introduced detailedly. The implement of each part of storage system and storage scheme for different scene was mainly elaborated. The development of storage module was completed, valid echoes detecting, FAT32 format conversion, high speed data transmission with SHB and controlling of SATA disk was realized.Each module of storage system was test, and the data acquisition and storage system in airborne single and bistatic SAR was successful in car's and plane's experiments. The result of imaging shows system is feasible in practice.