Method and device for measuring speed and distance based on OFDM signal

Abstract

The embodiment of the invention provides a method and device for measuring the speed and distance based on an OFDM signal. The method comprises the steps that a radio frequency signal obtained after the OFDM time domain baseband signal is converted is transmitted, wherein the OFDM time domain baseband signal comprises a transmission time frequency resource element matrix; at the transmission position of transmitting the radio frequency signal, an echo signal formed in the mode that the radio frequency signal is scattered and overlaid through all to-be-detected objects is received; a receivingtime frequency resource element matrix is extracted from the echo signal; based on the transmission time frequency resource element matrix and the receiving time frequency resource element matrix, anenvironment state sensing matrix is calculated; based on time domain discrete Fourier transform and frequency domain inverse discrete Fourier transform, the environment state sensing matrix is transformed, and a target matrix is obtained; based on a two-dimensional speed distance sensing graph expressed by a modular matrix of the target matrix, the relative speeds and relative distances of all theto-be-detected objects are determined. By adopting the scheme, the resolution ratio of measuring the speed and distance by using the OFDM signal is increased.

Description

Technical field [0001] The invention relates to the technical field of wireless signal processing, in particular to a method and device for measuring speed and distance based on OFDM signals. Background technique [0002] As the OFDM (Orthogonal Frequency Division Multiplexing) technology has multiple advantages such as high spectrum resource utilization efficiency, anti-fading and anti-multipath propagation effects, the OFDM-based large-capacity wireless communication system has developed rapidly. In addition, because OFDM signal has the advantage of high tolerance to Doppler frequency shift, OFDM technology is widely used in radar detection systems. Moreover, since the fusion of wireless communication and radar systems can bring large performance gains to radar systems, the fusion of wireless communication and radar systems based on OFDM signals has become a new development trend. [0003] Existing methods for measuring speed and distance based on OFDM signals mainly design phas...

AI Technical Summary

Problems solved by technology

[0004] However, the existing correlation processing methods based on baseband sampling points and OFDM symbols have insufficient utilization of the information carried by the time-frequency resource elements of OFDM signals, and there are limitations in the multi-filter design in OFDM signal processing, which limits the use of Resolution of OFDM Signal Measurement Distance and Velocity

Moreover, the multi-filter design also leads to high computational complexity

In addition, the phase encoding design used in the existing methods for measuring speed and distance based on OFDM signals is not conducive to the application of OFDM signals in communication systems, and hinders the integration of wireless communication and radar systems based on OFDM signals.

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