Resolving distance-velocity ambiguity method on basis of changing signal rate

Abstract

The invention relates to a resolving distance-velocity ambiguity method on a basis of changing signal rate, comprising the following steps of selecting different signal time widths to design N pulse signals on the premise of invariable pulse signal bandwidth and pulse repetition frequency; transmitting the pulse signals according to timing sequence and receiving echo signals of the pulse signals through a radar; performing matched filtering and judging whether to realize effective pulse pressure or not by utilization of a designed matched filter, and obtaining the distance ambiguity number and calculating an unambiguous distance and an unambiguous velocity.

Description

technical field

[0001] The invention belongs to the field of radar signal processing, in particular to a method for solving distance-velocity ambiguity based on changing signal modulation frequency. Background technique

[0002] For high-speed moving targets, pulse Doppler radar has the problem of ambiguity in distance-velocity measurement. To ensure that the distance is not ambiguous, the pulse repetition frequency needs to be reduced; and in order to avoid ambiguity in the velocity, the pulse repetition frequency needs to be increased as much as possible.

[0003] Pulse radar generally designs radar pulse waveforms according to the principle of unambiguous distance, while the problem of velocity ambiguity is solved by using methods such as distance differential, multi-carrier frequency, and multiple frequencies (no ambiguity in distance, ambiguity in velocity). The distance differential method is mostly used in the measurement of isolated point targets. When the distance m...

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