In order to simplify the system hardware and reduce the connection between DSP chips, the four DSPs of the system should be linked in a loosely coupled way. (3) Adaptive sidelobe cancellation and sidelobe blankingįour pieces of ADSP-TS101S are needed to realize the above two algorithms.
Because the system will convert the sampled signals to 1, 0, – 1, 0, 1 Such a digital sequence, so after demodulating the sampled signal, it will turn into zero IF signal, and then do FIR low-pass filtering on it. 1 shows if demodulation schematic diagram of the system. In this system, ep1k100 produced by Altera company is selected as FPGA. This function is used to complete quadrature demodulation and low-pass filtering in FPGA. (2) Orthogonal demodulation and low pass filtering The ADC of this system uses the 12 bit, 40 MSPs conversion rate high-performance analog-to-digital converter produced by American ADI company to convert I-channel and Q-channel analog signal into digital signal at a certain sampling rate. If sampling is mainly to read if data through ADC. The main functions of the anti-jamming board include if acquisition, orthogonal demodulation and low-pass filtering, adaptive sidelobe cancellation and sidelobe blanking. At the same time, it can also be used as a signal transmission bridge between boards to send the processed video data to the display. The motherboard is mainly used to provide power for the other three boards. There are 4 circuit boards in total, which are divided into motherboard, anti-jamming board, pulse compression board and MTD board. The system is the signal processor of a radar. Realization of system components and signal processing algorithm This paper introduces in detail the realization of a radar signal processing system based on ADI’s high performance dsp-adsp-ts101. Therefore, DSP is very suitable for the realization of radar digital signal processing algorithm. DSP can use hardware arithmetic unit, chip memory, Harvard bus structure, special addressing unit, pipelining technology and other special hardware structures to complete FFT, fir, complex multiplication and addition, correlation, trigonometric function and matrix operation at high speed. The main technologies involved in radar signal processing system include data resampling, parameter estimation, adaptive filtering, CFAR processing, pulse compression, adaptive beamforming and sidelobe cancellation, etc. As a programmable embedded processor for digital signal processing, DSP has the characteristics of high speed, flexibility, reliability, programmability, low power consumption, rich interfaces, fast processing speed and good real-time performance.
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