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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Problems solved by technology

[0004] 1) There are many types of pulse repetition frequencies required by the algorithm, and unified coherent accumulation cannot be performed, and different pulse repetition frequencies need to be accumulated separately, and the system implementation is more complicated;

[0005] 2) When using the remainder theorem to solve the fuzzy times, due to the influence of factors such as changes in the target line of sight and platform shaking, the remainder theorem sometimes cannot obtain a convergent solution;

[0006] 3) Since there are many types of pulse repetition frequency, the cycle of pulse radar measurement target will be extended, which will affect the data update rate index of radar

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