Method and device for moving target detection

Abstract

Embodiments of the present invention provide a method and device for detecting a moving object, which are used to improve the detection accuracy of the moving object and reduce the cost of software and hardware for detection. The method includes: receiving a digital signal transmitted by a radio frequency module, converting the digital signal into a time-domain digital baseband signal, wherein the digital signal is OTFS modulated on a preset delayed Doppler domain symbol, and then passed a one-dimensional After the inverse Fourier transform, the signal transmitted indoors through the radio frequency module after digital-to-analog conversion; the OTFS signal demodulation is performed on the time-domain digital baseband signal to obtain a channel estimate in the delayed Doppler domain; based on the channel estimate , to determine the number of moving targets.

Description

technical field [0001] The invention relates to the technical field of steel rolling, in particular to a method and a device for detecting moving objects. Background technique [0002] In the prior art, the non-contact detection of multiple indoor moving objects is realized through wireless signals, and a receiver based on the OFDM (Orthogonal Frequency Division Multiplexing, Orthogonal Frequency Division Multiplexing) technology is usually used to detect the RSSI (Reference Signal of the transmitted signal) Strength Indicator, reference signal strength) changes, and then determine whether there is a moving target. Since the RSSI value deviates greatly within a period of time, it is mainly affected by multiple factors such as target movement, channel fading, and occlusion. The differential method cannot be eliminated. The random jitter of the reference signal strength RSSI cannot accurately detect whether there are multiple moving targets. Therefore, this detection method ha...

AI Technical Summary

Problems solved by technology

[0002] In the prior art, wireless signals are used to realize the non-contact detection of multiple moving objects indoors, and a receiver based on OFDM (Orthogonal Frequency Division Multiplexing, Orthogonal Frequency Division Multiplexing) technology is usually used to detect the RSSI (Reference Signal Strength Indicator, reference signal strength) changes, and then determine whether there is a moving target. Since the RSSI value deviates greatly within a period of time, it is mainly affected by multiple factors such as target movement, channel fading, and occlusion, and the difference method cannot be eliminated. The random jitter of the reference signal strength RSSI cannot accurately detect whether there are multiple moving targets, so this detection method has a high false detection rate

[0003] In the prior art, active radar imaging technology can also be used to detect moving targets. The transmitter actively transmits radar signals, and the receiver detects the number of moving targets by receiving radar echoes reflected by moving objects and stationary objects. Due to the traditional The working carrier of the radar signal generally works in a dozen GHz or even tens of GHz, and the performance of penetrating walls is poor

Better wall penetration performance can be achieved by increasing the power or assembling multiple transmitting and receiving antennas, but the goal of miniaturization and low power consumption of the RF module cannot be achieved

In addition, radar signals need to be processed by a strong digital signal processor or FPGA, and the cost of hardware and software implementation is high

[0004] Therefore, there is a technical problem that the moving target detection method in the prior art cannot have both high detection accuracy and low hardware and software implementation cost.

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