Design And Realization Of Weak Signal Detection System Based On Long-time Integration

In radar signals detection system, an efficient method to improve detection performance is to enhance available energy from returned targets by integration. During long time integration, the energy and detection performance were influenced badly by range migration and time varying Doppler frequency, which were brought by moving targets. The traditional method using FFT has become inapplicability. Based on radar signals detection theory, a long time integration algorithm based on coherent integration within segment and noncoherent integration among segment are proposed in this paper. Range migration and compensation from this algorithm are also discussed.Furthermore, based on the experience of developing generic parallel signal processing machine and the estimation to the quantity of operations and communication in the system, a universal hardware system based on hybrid framework of high-performance DSP+FPGA is designed. Besides, the software design of this integration algorithm is implemented on this hardware flat. At last, on data transfers technology, link ports of DSP, Ethernet high speed interface, serial interface and PCI-bus protocol are discussed amply.