Research On Sea Target Detection Using Spaceborne GNSS-Rtechnology

At present, the application range of the satellite navigation system is already beyond the traditional field of precise positioning, navigation, timing, and other functions, multipath signals through reflective surface carrying a large number of feature information ofthe reflection surface, which is a new technology to realize the characteristics of the measured medium elements.Navigation satellite signal as the non-cooperative external sources of passive radar detection model is realized as a kind of new technology by wide attention both at home and abroad.Compare with shore-based and airborne receiving platform,sea surface target detection technology based on LEO satellite receiving platform offer advantages such as not restricted by the geographical environment, antenna cover range, can be more star launch at the same time, good real-time performance and to detect multiple regions, the use of GNSS-R of the sea target detection technology is still in the initial exploration stage.This paper mainly analyzed from the angle of system principle and feasibility. First analyzed the GNSS-R system principle and mathematical model of sea surface target detection technology, proposes a sea surface target fuzzy elimination method.And then analyzedthe affect of the double-base angle on the surface of the target radar scattering cross-section(RCS) with the help of electromagnetic simulation software FEKO from the perspective of double-base radar target scattering intensity, Preliminary applications shows that radar target RCS can achieve maximum when the double-base Angle is about 180 degree.For the cover performance of LEO satellite platform of GNSS-R detection of sea target, this paper analyses the geometric relationships in the reflection events, single platform coverage, spaceborne platform detection time.8 star system and 16 star system were established based on the simulation software STK of the bohai sea region of China. the data were analyzed in detail.Processing results show that the different heights of LEO satellite platform can realize the detection of ships at sea within a certain time.Based on LEO satellite platform of network and the reasonable design of orbit, the global seamless monitoring technology for surface vessels can be achieved using GNSS-R.In addition, the paper finally gives the data processing of theLEO spaceborne GNSS-R platform in detail, and has carried on the simulation analysis of the whole system using MATLAB.Preliminary simulation results demonstrated the use of spaceborne receiving platform based on the GNSS-R feasibility of large sea surface target detection technology.