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Electronic reconnaissance broadband digital receipt signal processing method based on under sampling

An electronic reconnaissance and digital receiving technology, applied in radio wave measurement systems, instruments, etc., can solve problems such as difficult work and limited processing bandwidth, and achieve the effect of increasing processing bandwidth, solving data "bottlenecks, and small amount of calculation."

Inactive Publication Date: 2012-09-05
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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Problems solved by technology

With the increasing requirements for receiver processing bandwidth, it is very difficult to use analog devices to convert broadband real signals into complex signals, and digital methods for orthogonal transformation are not suitable for complex engineering implementations. Therefore, in this case, the receiver can only process a single-channel real signal, and its processing bandwidth is restricted by the sampling frequency of the AD device, which can only reach half of the sampling frequency of the AD device.

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  • Electronic reconnaissance broadband digital receipt signal processing method based on under sampling
  • Electronic reconnaissance broadband digital receipt signal processing method based on under sampling
  • Electronic reconnaissance broadband digital receipt signal processing method based on under sampling

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Embodiment Construction

[0032] Below in conjunction with accompanying drawing, the technical scheme of invention is described in detail:

[0033] The present invention adopts two ADs with close sampling rates to sample the real signal respectively, assuming that their sampling rates are respectively f s1 and f s2 (f s1 > f s2 ), then the processing bandwidth of the wideband digital receiver can reach f s2 . Moreover, the received signal targeted by the algorithm of the present invention may be a sine wave signal with a single frequency component, or a multi-component signal including two frequencies.

[0034] Suppose the processing bandwidth of the receiver is f b , the input signal x(t) is M frequency in 0~f b The sine wave components between are superimposed, and the signal model is shown in (1) and (2), where x(t) is the input signal, x m (t) is the mth component, A m , f m and are the amplitude, frequency and initial phase of the mth component respectively, and 0≤f m b .

[0035] Wi...

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Abstract

The invention discloses an electronic reconnaissance broadband digital receipt signal processing method based on under sampling. The method of the invention includes that: system bandwidth of a receiver is determined, and two sampling ADs are selected; according to Winograd algorithm, FFT operation is respectively carried out on the two AD acquisition signals, so as to obtain a first frequency spectrum of a first sampling AD and a second frequency spectrum of a second sampling AD; modulus of the two frequency spectrums are obtained; maximum of modulus of the two frequency spectrums and position thereof in spectral line as well as sub-maximum of modulus and position thereof in spectral line are searched, and finally frequency value of primary sinusoid component is obtained. The invention can cause the processing bandwidth of the receiver to breakthrough half of sampling frequency of AD device without using complex signal and improves the processing bandwidth.

Description

technical field [0001] The invention relates to a digital processing method for radar signals in the field of electronic reconnaissance broadband digital reception. Background technique [0002] Wideband digital receiver technology is a hot topic in the field of electronic reconnaissance. With the increase of processing bandwidth, the requirements for AD sampling rate and subsequent digital signal processing capability also increase, which brings difficulties in engineering implementation. [0003] At present, the processing objects of electronic reconnaissance broadband digital receivers are usually complex signals (such as digital channelized receivers, see literature [1-4]), if the sampled signal is a complex signal with I and Q paths orthogonal to each other, then the receiving The system processing bandwidth of the computer is equal to the sampling rate of the two ADs. However, the received radar signal is a single-channel real signal. When the system processing bandwi...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S7/00G01S7/295
Inventor 胥嘉佳刘渝王旭东
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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