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Bistatic measurement method for mobile radiation source centre frequency

A technology of center frequency and measurement method, applied in transmission monitoring, electrical components, transmission systems, etc., can solve the problems of unknown velocity parameters of Doppler frequency shift equation and finding moving targets, etc.

Inactive Publication Date: 2010-12-15
CHINESE AERONAUTICAL RADIO ELECTRONICS RES INST
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Problems solved by technology

[0004] However, for a fixed single-station positioning system, since the velocity parameter included in the Doppler frequency shift equation is also unknown, it is difficult to directly use the same derivation idea as the motion detection platform to obtain the center frequency of the signal radiated by the moving target

Method used

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  • Bistatic measurement method for mobile radiation source centre frequency
  • Bistatic measurement method for mobile radiation source centre frequency
  • Bistatic measurement method for mobile radiation source centre frequency

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Embodiment

[0029] figure 1 A schematic diagram of the detection of mobile radiation sources by fixed dual stations is given; Figure 2-5 The wavelength-relative error curves are given at different inter-station distances, different flight distances, different initial azimuth angles and different flight speeds.

[0030] 1. Geometric motion relationship

[0031] The plane geometric relationship of the detection target of the fixed dual-station positioning array is as follows: figure 1 shown. Assuming that the moving target moves approximately along a straight line from node 1 to node 3 through node 2, the receivers of each monitoring station measure the frequency of the radiated signal of the moving target synchronously and in real time.

[0032] 2. Formula derivation

[0033] (1) The ratio of the Doppler rate of change of adjacent nodes

[0034] According to the definition of Doppler frequency shift rate of change, the following equations can be listed at each measurement site:

[0...

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Abstract

The invention discloses a bistatic measurement method for mobile radiation source centre frequency. The method comprises the following steps of: supposing a measured target to move uniformly; synchronously measuring the frequency of a mobile target radiation signal in real time by using two monitoring station receivers; respectively obtaining a ratio of tangential velocities between adjacent nodes according to Doppler frequency excursion change rate equations; approximately expressing the ratio of the tangential velocities between the adjacent nodes by the ratio of frequency differences between the adjacent nodes according to the definition of Doppler change rate; after substituting the ratio relationship of the tangential velocities into a velocity identical relational expression between the adjacent nodes, respectively obtaining a function equation about wavelength-velocity by using the two measuring stations; and simultaneously solving for eliminating unknown target velocity to obtain an analytical formula of the target signal centre wavelength. The method can realize the measurement of the radiation source signal centre frequency of the unknown movement velocity only on the basis of the real-time frequency measurement technology. Moreover, the method can realize the detection of the frequency of the mobile ration source by adopting a short baseline, and is suitable to be used in various carriers such as vehicles, ships and warships, aircrafts and the like.

Description

technical field [0001] The invention belongs to the field of radio management and monitoring, and in particular relates to a method for determining the center frequency of a mobile radiation source in the air by using two fixed receiving stations based on real-time frequency measurement technology. Background technique [0002] The radio monitoring and management of mobile radiation sources whose signal center frequency is unknown generally must first measure the Doppler frequency shift of the mobile radiation signal according to the Doppler principle, and then calculate the center frequency of the signal from the measured frequency value. However, the existing Doppler frequency shift equation itself also includes the central wavelength (frequency) parameter of the measured radiation source signal. [0003] The latest research shows that for a single-station measurement system with known motion velocity of the platform itself, by comprehensively using the velocity vector equ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B17/00
Inventor 郁涛
Owner CHINESE AERONAUTICAL RADIO ELECTRONICS RES INST
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