Simultaneous multi-frequency networking MIMO full-digital receiver for high-frequency ground wave radar

Abstract

The invention provides a simultaneous multi-frequency networking MIMO full-digital receiver of a high-frequency ground wave radar. With the receiver adopted, the problems of poor anti-interference capability, unbalance between detection distance and detection precision during ocean kinetic parameter detection and high possibility of being detected of detection targets can be solved. The receiver comprises an analog front-end unit, a programmable logic device (FPGA), a high-speed digital-to-analog converter and a Beidou / GPS clock synchronization networking module; the the Beidou / GPS clock synchronization networking module enters a taming mode after receiving and locking a Beidou / GPS satellite signal, outputs a radar initial synchronization signal to the programmable logic device (FPGA) after finishing taming, and outputs a clock signal to drive the programmable logic device (FPGA) and the analog front-end unit; the analog front-end unit works under the driving of the clock signal, converts an analog echo signal into an LVDS digital signal, and transmits the digital signal to the FPGA, wherein the analog echo signal is scattered back by a sea surface and received by a receiving antenna; and the programmable logic device (FPGA) mixes the LVDS digital signal with a COS digital signal and an SIN signal which are generated by a digital DDS local oscillator in the programmable logic device (FPGA); after an obtained mixed signal is processed by a digital filter, an IQ signal can be obtained, and the IQ signal is transmitted to a PC through a gigabit network.

Description

technical field [0001] The invention relates to a simultaneous multi-frequency networking MIMO all-digital receiver for high-frequency ground wave radar, belonging to the field of radar receivers. Background technique [0002] At present, high-frequency ground wave radar generally only has one operating frequency, and its radar signal receiver has a narrow operating bandwidth and weak anti-interference ability. From the results of high-frequency ground wave radar detection of dynamic parameters of the ocean surface, compared with high and low frequencies under the same power of the transmitter, the advantage of the low frequency band (3-15MHz) is that the detection distance is long and the maximum wave height that can be detected is relatively large. The disadvantage is that the accuracy of the detection data is low; the advantage of the high frequency band (15-40MHz) is that the accuracy of the detection data is high, but the disadvantage is that the detection distance is r...

AI Technical Summary

Problems solved by technology

Moreover, the existing high-frequency ground wave radars all work at a single station, not only cannot receive signals from adjacent radar stations in the same frequency band, but also the signals emitted by the two radar stations are likely to interfere with each other, affecting the detection effect; if it can work in a network, That is, radar MIMO technology, which transmits and receives at the same time, can not only avoid interference, but also receive the echoes of the electromagnetic waves emitted by the other party and improve the detection performance of high-frequency ground wave radar.

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