Broadband digital signal frequency real-time searching method and device
A digital signal, real-time search technology, applied in the field of signal processing, can solve the problems that do not meet the development requirements of digital receivers, and cannot receive multiple narrowband signals simultaneously.
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Embodiment 1
[0046] In this embodiment, a method for real-time searching of a broadband digital signal frequency is specifically provided, the method comprising:
[0047] 1. Run the search algorithm through the FPGA, which includes channelizing the high-speed broadband intermediate frequency signal to obtain the low-speed baseband signal and performing time-domain detection and frequency-domain detection on the low-speed baseband signal to obtain time-frequency information, and time-frequency The information is updated and output in real time, and the time-frequency information includes at least the time-domain amplitude, pulse width, spectral line position, and frequency-domain amplitude; in this embodiment, the FPGA undertakes the main search algorithm implementation, and according to the partial prior information of the high-speed broadband intermediate frequency signal , using multi-channel, narrowband, fixed carrier frequency parallel reception and digital filtering to obtain relevant ...
Embodiment 2
[0072] Specifically provide a kind of broadband digital signal frequency real-time search device in the present embodiment, this device adopts the cooperative work mode of FPGA+DSP, and this device comprises FPGA, DSP, peripheral clock and power supply, and described FPGA, DSP and peripheral clock are respectively be connected to and powered by a power source;
[0073] The FPGA is loaded with a search algorithm and outputs time-frequency information through the search algorithm. The Field Programmable Gate Array FPGA is used as the main implementation chip of the search algorithm. The performance of the FPGA has a direct impact on the search performance. Considering that the search process includes NCO, DDC , FIR, FFT and other massive calculations, so there is a certain demand for resources. Typical LUT resources are about 100,000 or more, and multiplier resources (DSP) are about 1,000 or more;
[0074] The DSP interacts with the FPGA data through the EMIF bus, and the DSP is...
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