Moving target detection method and device

Abstract

The embodiment of the invention provides a moving target detection method and device and is used for improving detection precision of moving targets and reducing the detection software and hardware cost. The method comprises the steps of receiving a digital signal transmitted by a radio frequency module and converting the digital signal into a time domain digital baseband signal, wherein the digital signal is the signal which is transmitted to a room by the radio frequency module after OTFS (Orthogonal Time Frequency Space) modulation, one-dimensional Fourier inverse transform and digital-to-analogue conversion are carried out on a preset delay Doppler domain symbol; carrying out the OTFS modulation on the time domain digital baseband signal to obtain delay Doppler domain channel estimation; and determining the number of the moving targets based on the channel estimation.

Description

technical field [0001] The invention relates to the technical field of steel rolling, in particular to a method and device for detecting a moving target. Background technique [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. [00...

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.

Images