A Method of Constant Frequency Wave Radar Ranging

Abstract

The invention discloses a constant frequency wave radar range finding method, comprising steps of obtaining target speed and an angle of a current Nth cycle, determining whether N-1th cycle has data, if yes, skipping to a step 3, if not, continuing to collect the data of a next cycle and skipping to the step 1, comparing an angle value of the Nth cycle with the angle value of the N-1 th cycle, taking the distance measured during the N-1 th cycle as a current target distance if the angle values are identical, skipping to the step 4 of the angle values are different, and adopting a recurrence method to calculate the target distance of the Nth cycle. The invention utilizes two consecutive cycles to detect the change of the distance and the angle, provides the distance information of the object, the distance which is obtained through current calculation is irrelevant with the distance obtained through calculation of the other cycle, and the accuracy of range finding is improved.

Description

technical field [0001] The invention belongs to the field of lane change assistance, in particular to a method for measuring distance with a constant frequency wave radar. Background technique [0002] At present, when processing the speed signal of the locomotive, a special test distance measuring device is required to process the information from multiple sensors, so as to obtain the speed and distance information of the locomotive running. This not only takes up limited space inside the locomotive, but also increases the difficulty of wiring inside the locomotive, thereby causing inconvenience in use and maintenance. At present, there are various radar ranging products on the market. FMCW is frequency-modulated wave radar. Frequency-modulated wave radar ranging is different from conventional pulse wave radar. Most of them use digital signal analysis such as Fourier transform, wavelet analysis, and instantaneous autocorrelation algorithm. method implementation. The advan...

AI Technical Summary

Problems solved by technology

The advantage is that the circuit structure is simple and clear, and the scheme is relatively mature; the disadvantage is that the calculation amount is large, which requires high computing power of the processor. At the same time, the calculation amount will affect the power consumption of the chip, and the time accuracy and amplitude accuracy of signal sampling are high. , the cost is also higher

In the prior art, constant-frequency wave radar is often used for speed measurement, but rarely for distance measurement

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