Ultra-wideband radar system and method for realizing single-channel multi-frequency-point simultaneous transmission and reception

Abstract

The invention discloses an ultra-wideband radar system and a method for realizing single-channel multi-frequency-point simultaneous transmission and reception. The ultra-wideband radar system comprises a control processing module, a transceiving antenna, a transmitter branch circuit and a receiver branch circuit, wherein the transmitter branch circuit and the receiver branch circuit are arranged between the control processing module and the transceiving antenna; the transmitter branch circuit receives a control command of the control processing module and generates a required multi-frequency-point digital baseband signal, carries out mixing, digital-to-analog conversion and quadrature up-conversion in sequence, outputs the required multi-frequency-point digital baseband signal and transmits the required multi-frequency-point digital baseband signal by means of the transceiving antenna; and the receiver branch circuit receives a multi-frequency-point analog echo signal from the transceiving antenna, carries out quadrature down-conversion, analog-to-digital conversion and mixing in sequence, and then outputs a multi-frequency-point baseband signal to the control processing module. The method is a method for realizing single-channel multi-frequency-point simultaneous transmission and reception. The ultra-wideband radar system and the method can realize simultaneous transmission and reception of single-channel multi-frequency-point signals, and have the advantages of small frequency interval of stepping frequency, long 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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