A digital processing module for shortwave two-dimensional direction of arrival estimation

Abstract

The invention provides a digital processing module for short-wave two-dimension direction-of-arrival estimation. The digital processing module includes ten A / D conversion chips, three digital down-conversion chips, an FPGA chip and an OMAP chip. The A / D conversion chips convert acquired analog signals into digital signals and send the converted digital signals to the three digital down-conversion chips. The three digital down-conversion chips carry out digital down-conversion processing on the received digital signals and send processed 10 paths of frequency conversion signals to the FPGA chip. The FPGA chip carries out filtering and a two-dimension direction-of-arrival estimation operation on the received 10 paths of frequency conversion signals and sends pitch angle information of two-dimension arrival, obtained through the estimation, to the OMAP chip. The OMAP chip converts the pitch angle and azimuth angle data of the two-dimension arrival, sent by an FPGA high-speed serial port into parallel bus data and sends the parallel bus data to a CPCI interface chip. The digital processing module adopts the OMAP chip and the FPGA chip, which are higher in processing capability, to realize two-dimension direction-of-arrival estimation on short-wave signals and is excellent in software transplantability; and the digital processing module adopts a CPCI bus and is high in universality.

Description

technical field [0001] The invention belongs to the design of electronic circuits, in particular to a short-wave two-dimensional direction-of-arrival estimation digital processing module. Background technique [0002] As the core technology in the mobile communication system, the smart antenna can effectively resist the interference signal and improve the communication quality and reliability. Due to the time-varying fading and many interference signals in short-wave communication, the receiving signal-to-noise ratio is often low and the communication effect is poor. Applying smart antenna technology to short-wave communication can improve the communication effect. Direction of arrival estimation is a key technology in smart antennas. By judging the incoming wave direction of the signal, it automatically adjusts the transmitting and receiving pattern, so that it forms a null in the interference direction, cancels the interference signal, and forms the main beam in the direc...

AI Technical Summary

Problems solved by technology

[0003] In the past, digital processing modules often used the circuit combination of DSP+CPLD or DSP+FPGA. There are many types of DSP chips, and the languages ​​of each chip are also different, which brings a lot of inconvenience to software transplantation.

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