Accurate phase measurement method of multipath multi-target echo signal

Abstract

The present invention discloses an accurate phase measurement method of a multipath multi-target echo signal. The concrete steps of the method are that a sending terminal emits a narrow pulse signal, the initial phases of the front and back adjacent pulses keep a certain difference value, and the design of a pulse width guarantees that the echo signal possesses a certain distance resolution ratio; a receiving terminal selects a segment of received signal at the specific position in each pulse by taking a synchronization pulse provided by the sending terminal as reference, and splices the multiple segments into a continuous wave signal of a long cycle; the continuous wave signal of the long cycle is carried out the narrowband filtering to filter the noise outside the band and improve the signal to noise ratio of a to-be-processed signal; the phase value of the filtered signal is calculated by utilizing Fourier transform. Compared with other signal processing method, the beneficial effects of the method are that: the continuous wave signal of the long cycle is spliced by an effective method, thereby facilitating the filtering of a noise component; the contradiction between the pulse width and the signal width can be solved effectively; the signal to noise ratio of a measurement signal and the phase measurement precision of the multi-target echo signal can be improved remarkably.

Description

Technical field [0001] The invention involves the accurate phase measurement of multi -way and multi -target echo signals, which is suitable for occasions where high -precision phase measurement is performed under low signal -to -noise ratio.Can be applied in the field of multi -way multi -target high -precision phase measurement. Background technique [0002] Measurement and analysis of the target's echo signal requirements increase the signal -to -noise ratio of receiving signals and higher target distance resolution.The return signal of the target signal is low, and how to effectively improve the measurement accuracy of the multi -way and multi -target echo signal phase under lower signal -to -noise ratio and improve the resolution of the target.The focus of the field.Linear frequency regulatory signals can obtain high signal -to -noise ratio and high target distance resolution, but there is technical difficulty in the performance of multi -way signal parameters.The continuous...

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Problems solved by technology

In the measurement of multi-channel multi-target echo signals, the above two are contradictory, and the traditional linear frequency modulation signal is difficult to ensure the coherence of multi-channel signals. At present, a more general and effective solution to multi-channel multi-target echo signals has not been retrieved. A method for the difficult problem of high-precision phase measurement of signals

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