A short-range high-resolution detection imaging method and device

Abstract

The invention discloses a short-range high-resolution detection imaging method and a device for implementing the same. A linear frequency modulation source 7 outputs wideband linear frequency modulation signals to a transmitting antenna array 6 as transmitting signals, and also outputs the signals to a mixer array 3 as local oscillator signals; and target echo signals are amplified by an LAN array 4 and output to the mixer array 3 after being received by a receiving antenna array 5. The target echo signals are mixed with the local oscillator signals into medium-frequency signals by the mixer array 3, and the medium-frequency signals are subjected to AD conversion by multi-channel data acquisition modules 2 and then output to a signal processing and imaging module 1. The wideband linear frequency modulation signals are used as detection signals, the remote detection is implemented by delaying the local oscillator signals to further complete frequency mixing, so that imaging resolution of the whole detected zone is guaranteed, and limitation of maximum unambiguous distance to the detection range is eliminated. Only the medium-frequency signals are needed to be acquired, a wideband high-speed sampling system is omitted, and accordingly data acquisition implementing difficulty is lowered.

Description

technical field [0001] The invention relates to a detection and imaging method and device, in particular to a short-range high-resolution detection and imaging method and device. Background technique [0002] The short-range detection imaging device can be used for target tracking and positioning through obstacles, ground exploration, search and rescue of ruins, security checks and other purposes. Improving its imaging resolution and imaging speed, increasing its detection range, reducing its cost and implementation difficulty have always been the main difficulties in the design. The imaging resolution of the device depends on the effective bandwidth of the detection signal, the larger the effective bandwidth, the higher the resolution. Therefore, a higher resolution can be obtained by using the broadband signal as the detection signal for imaging. At present, domestic and foreign scholars have put forward the implementation schemes mainly in the following ways: [0003] ...

AI Technical Summary

Problems solved by technology

The distance resolution required by short-range imaging devices is usually higher, and the instantaneous bandwidth at the receiving end will be larger, even up to several GHz. If this solution is directly adopted, it will be more difficult to implement and the cost will be higher

Images