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

A speed ambiguity and distance solution technology, applied in the field of distance-velocity ambiguity, can solve the problems of prolonged pulse radar cycle, complex system implementation, affecting radar data update rate indicators, etc., to achieve the effect of improving data update rate and improving tolerance

Active Publication Date: 2014-12-24
XIAN INSTITUE OF SPACE RADIO TECH
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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

Method used

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

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Embodiment

[0061] Adopt the method of the present invention to carry out the distance-velocity ambiguity calculation to Ka frequency band radar, wherein the number M of coherent accumulation is set to 512, and the received echo data length U=667, setting has only one target, and measured target and radar The distance is 1.55km, and the moving speed of the target is 110m / s. The specific distance-speed fuzzy calculation is as follows:

[0062] (1) Initialize the radar system parameters, where the farthest operating distance R max = 2km, target maximum speed V max=220m / s, the shortest operating distance R min =1.5km, distance resolution Δτ=0.75m, Doppler resolution Δf=16Hz, system signal wavelength λ=8mm;

[0063] (2) Calculate the number of pulse signals N=round(8R max V max / (cλ)), N=2 is obtained by calculation, that is, the method needs two kinds of pulse signals to realize the distance-velocity fuzzy calculation;

[0064] (3) Calculate the pulse signal bandwidth B=c / (2Δτ), and cal...

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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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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F19/00
Inventor 宋大伟尚社孙文锋范晓彦李栋罗熹
Owner XIAN INSTITUE OF SPACE RADIO TECH
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