Doppler frequency difference direction-finding method based on mobile platform
A Doppler frequency difference, mobile platform technology, applied in the field of radio measurement, can solve problems such as large amount of calculation
Active Publication Date: 2013-07-31
CHINESE AERONAUTICAL RADIO ELECTRONICS RES INST
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Problems solved by technology
In actual use, the method of combining long and short baselines has limitations. For the multi-baseline defuzzification method, due to the need for multi-dimensional integer search, there is a problem that the amount of calculation is relatively large
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[0057] A method of direction finding for mobile platforms based only on Doppler frequency difference measurements. figure 1 An L-shaped Doppler passive direction-finding array is given; figure 2 The relative error at different baseline lengths is given; image 3 Relative errors are given for different radial distances.
[0058] Using the direction finding system on the mobile platform, and through the movement of the platform, the same radiation source on the ground can be detected at different observation points on the flight path, and a set of direction measurement information can be obtained. According to such a set of direction information and according to a certain Algorithms, such as triangulation algorithms, are processed to obtain an estimate of the location of the radiation source.
[0059] At present, the main methods that can be used for direction finding of mobile platforms are: amplitude ratio direction finding method and phase interference direction finding me...
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The invention relates to a Doppler frequency difference direction-finding method based on a mobile platform. The method assumes that an object is still or moves at a low speed; and in the direction-finding plane, three antennae are used to construct one L-shaped array of which two baselines are mutually perpendicular to each other, wherein one baseline is parallel to the longitudinal axis of the mobile platform, and the other baseline is perpendicular to the longitudinal axis of the mobile platform. On one hand, by using Doppler frequency difference received by two antenna arrays parallel to the longitudinal axis, the sine angle of an incident wave is obtained based on a direction cosine change rate; and on the other hand, by using Doppler frequency difference received by two antenna arrays perpendicular to the longitudinal axis, the cosine angle of the incident wave is obtained based on the direction cosine change rate. Then, based on the ratio of the both, the unknown wavelength andangular speed contained in a trigonometric expression can be eliminated, thereby ensuring that the resulting direction tangent angle is only related to the known Doppler frequency difference and baseline length. The implementation method provided by the invention is simple, and is applicable to wide-band work and multi-target detection.
Description
technical field [0001] The invention belongs to the technical field of radio measurement, and in particular relates to a method for realizing unambiguous and high-precision direction finding on a mobile platform by only using the Doppler frequency difference measurement technology. Background technique [0002] With the wide application of radio spectrum resources and the increasing popularity of radio communications, in order to use limited spectrum resources in an orderly and reliable manner and to ensure the smooth flow of radio communications, radio monitoring and radio direction finding have become indispensable, and their status and role are still will increase over time. [0003] In fact, with the commercialization of 3G, the maturity of Wi-Fi and WiMAX technology, mobile digital TV. With the wide use of broadband wireless access systems, etc., the number of radio stations and various radio transmission equipment will increase sharply, which also makes traditional ra...
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IPC IPC(8): G01S3/52
Inventor 郁涛
Owner CHINESE AERONAUTICAL RADIO ELECTRONICS RES INST