Ultra-Wideband Radar System and Method for Simultaneously Transmitting and Receiving Single Channel Multi-Frequency Points

Abstract

The invention discloses an ultra-wideband radar system and method for simultaneously transmitting and receiving multiple frequency points of a single channel. The system includes a control processing module, a transmitting and receiving antenna, a transmitter branch, a receiver branch, a transmitter branch, and a receiver branch. Set between the control processing module and the transceiver antenna, the transmitter branch receives the control command from the control processing module and generates the required multi-frequency point digital baseband signal, and then performs frequency mixing, digital-to-analog conversion, and quadrature up-conversion in sequence to output The required multi-frequency point analog signal is transmitted through the transceiver antenna, and the receiver branch receives the multi-frequency point analog echo signal from the transceiver antenna, and outputs the multi-frequency point baseband after sequentially undergoing quadrature down-conversion, analog-to-digital conversion, and frequency mixing The signal is sent to the control processing module; this method is a method for realizing simultaneous transmission and reception of multiple frequency points in a single channel. The invention can realize the simultaneous sending and receiving of single-channel multi-frequency point signals, and has the advantages of small frequency interval of step frequency, large maximum operating distance, short scanning time and the like.

Description

technical field [0001] The invention relates to the technical field of ultra-wideband radar systems, in particular to an ultra-wideband radar system and method for realizing simultaneous transmission and reception of single channel and multiple frequency points. Background technique [0002] Modern radar technology is developing in the direction of ultra-wideband, super-resolution, multi-functional, software-based and intelligent. It has been widely used in the field of object recognition. Ultra-wideband signals have the advantages of high resolution, low intercept probability, large information content, and the ability to detect stealth targets, so they show great advantages in the fields of SAR imaging radar, ground-penetrating radar, and anti-stealth technology. , due to the ultra-wideband and high-resolution characteristics of ultra-wideband signals, the fine echo response of complex targets can be obtained, which is very beneficial to target identification. [0003] T...

AI Technical Summary

Problems solved by technology

Traditional SFCW generally generates frequency steps through phase-locked loop (PLL), direct digital synthesis (DDS) or a combination of the two methods. Due to the frequency jump generated by the phase-locked loop, its locking time is generally longer. Through DDS Although the method can achieve fast frequency switching, the bandwidth of the frequency hopping, that is, the bandwidth of the entire radar, is relatively narrow. Using the combination of the two methods can not only achieve fast frequency switching, but also ensure the narrow bandwidth of the radar. However, the above three This method can only transmit one frequency point at a time. For a radar system with a larger bandwidth and a smaller frequency step, the method of changing the frequency step point by point makes the radar receive very little data, that is, the radar data refresh The rate is very low, the time to detect the target will be longer, and the real-time performance is poor

[0004] At the same time, for SFCW, the maximum operating distance of the radar is the maximum unambiguous distance of the radar, and the maximum unambiguous distance is inversely proportional to the interval of the step frequency, that is, the smaller the step of the SFCW signal, the greater the maximum unambiguous distance, but when The bandwidth of the radar is relatively wide, such as hundreds of megabits and the number of channels reaches more than tens, the smaller frequency step will greatly increase the scanning time, and the larger the frequency step will shorten the operating distance, it is difficult to meet the requirements at the same time. Requirements for both working distance and stepping frequency

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