Fractional order Fourier domain channelized receiving method
A fractional Fourier, receiving method technology, applied in the field of radar reconnaissance, can solve the problem of large signal-to-noise ratio in signal processing, and achieve the effect of improving the signal-to-noise ratio
Inactive Publication Date: 2010-11-10
BEIJING INSTITUTE OF TECHNOLOGYGY
View PDF2 Cites 13 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
[0005] Aiming at the problem that the energy of the broadband chirp signal overflows to multiple channels in the traditional Fourier domain channelization receiving method, the signal-to-noise ratio of the subsequent signal processing is too large, the present invention proposes a fractional Fourier domain channelization receiving method
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
Embodiment Construction
[0029] The implementation flow chart of the fractional Fourier domain channelized receiving method proposed by the present invention is as follows figure 1 As shown, the system structure diagram is as figure 2 Shown. First, according to the characteristics of the observed broadband signal, select the transform order p of the fractional Fourier domain channelization receiver and the counterclockwise rotation angle of the fractional Fourier domain relative to the Fourier domain α=pπ / 2 , Time domain sampling interval Δt, channel number K and decimation factor M, and K=MF, F is a positive integer, select the low-pass filter h with passband cutoff frequency π / K and stopband cutoff frequency 2π / K L (n) is the low-pass prototype filter for channelized reception, and h is obtained from equation (1) L (n) K multiphase components (g l (n)) l＝0，1，...，K-1 ;
[0030] On this basis, the specific implementation steps of the present invention are as follows:
[0031] (1) After passing the input ...
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More PUM
Login to View More Abstract
The invention relates to a fractional order Fourier domain channelized receiving method, which belongs to the technical field of radar reconnaissance. A fractional order Fourier domain filter is utilized to analyze input signals extracted in a delay mode on the basis of the focusing performance of fractional order Fourier transform on non-stationary signals, and then chirp modulation and inverse discrete Fourier transform are carried out on the output signals of the filter to obtain final system output signals. The fractional order Fourier domain channelized receiving method solves the problem of the existing channel receiving method that energy is overflowed to a plurality of channels when wideband LFM signals are processed, increases the signal-to-noise ratio of follow-up signal detection and parameter estimation, effectively keeps the wave shapes of the intercepted signals, has equivalent computation complexity with a conventional channelized receiving method, and provides an effective tool for the reconnaissance of wide-band radar signals under the environment with low signal-to-noise ratio.
Description
Technical field [0001] The invention relates to a channelized receiving method in the fractional Fourier transform domain, belonging to the technical field of radar reconnaissance. Background technique [0002] In modern warfare, radar confrontation plays an increasingly important role. Radar countermeasures are divided into two parts: radar reconnaissance and radar jamming. Radar reconnaissance is a technical measure that uses special electronic equipment on various platforms to obtain technical parameters and information such as location, type, and deployment by intercepting, measuring, analyzing, identifying and positioning enemy radar radiation signals. The information obtained by radar reconnaissance provides a basis for formulating electronic countermeasures and developing radar countermeasure equipment on the one hand. On the other hand, it also provides a basis for commanders to ascertain the status of threat radar or radar-controlled weapon systems and then make judgmen...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More Application Information
Patent Timeline
Login to View More Patent Type & Authority Applications(China)
IPC IPC(8): G01S7/285G01S7/295
Inventor 陶然孟祥意赵兴浩王越
Owner BEIJING INSTITUTE OF TECHNOLOGYGY