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A single-frequency and multi-frequency gnss signal narrowband interference suppression device, system and method

A narrow-band interference and suppression device technology, which is applied in the field of satellite navigation digital signal processing, can solve problems such as large signal attenuation, output signal signal-to-noise ratio loss, and spectrum leakage, and achieve hardware cost reduction, independence, and narrow-band interference suppression. Effect

Active Publication Date: 2017-08-08
WUHAN MENGXIN TECH CO LTD
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Problems solved by technology

[0006] The first method is a simple interference suppression technology based on FFT / IFFT. The GNSS signal is output after windowing processing, FFT calculation, NBI filtering processing and IFFT calculation. Although this method can remove narrow-band interference, the windowing processing is reducing Spectrum leakage during FFT prevents interference from spreading to other frequency points, and at the same time causes distortion of the input signal, resulting in a loss of the signal-to-noise ratio of the output signal.
[0007] The second method is based on the interference suppression technology of OFFT (Overlapped Fast Fourier Transform, superimposed Fast Fourier Transform). On the basis of the first method, the GNSS signal is divided into two channels, which are respectively delayed by 1 / 2FFT block length And without delay, windowing, FFT, interference frequency removal, and IFFT are performed independently, and then combined according to a certain algorithm. This method has the advantages of easy design and can filter out multiple narrowband interferences at the same time, but it requires 4 FFTs (2 FFT modules and 2 IFFT modules) engine, the hardware implementation complexity is high, and the frequency resolution is low, and the signal attenuation is large
[0010] In order to solve the above problems, an FFT structure design method with reverse input and sequential output is proposed, which solves the additional storage requirements and pipeline delay problems brought by IFFT. However, GNSS input intermediate frequency signals are input sequentially in the time domain. If this method is used, it must be After windowing processing and before FFT calculation, the input data sequence is processed in "inverted order", so that the data input to FFT is in the order of FFT butterfly operation, and at the same time, the delay M / 2 processing module and windowing processing module are processed in time domain order , however, the "reversal order" processing needs to increase the memory for storage, which consumes a lot of hardware resources

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  • A single-frequency and multi-frequency gnss signal narrowband interference suppression device, system and method

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Embodiment 1

[0044] Embodiment 1. A single-frequency GNSS signal narrowband interference suppression device. Combine below figure 1 The device provided in this embodiment will be described in detail.

[0045] see figure 1 , The device provided in this embodiment includes a delay module, a windowing processing module, an FFT calculation module, an NBI filter processing module, an IFFT calculation module, and a superposition processing module.

[0046] The delay module is used to receive one GNSS signal, and delay it by M / 2 sampling points and output it to the windowing processing module, where M is the length of an FFT block, specifically an exponent power of 2.

[0047] The windowing processing module is used to receive one GNSS signal and the GNSS signal delayed by M / 2 sampling points sent by the delay module, and perform windowing processing on the two time domain GNSS signals respectively.

[0048] Specifically, the windowing processing module is used to receive one GNSS signal, and ...

Embodiment 2

[0056] Embodiment 2. A method for suppressing narrow-band interference of single-frequency GNSS signals. Combine below figure 2 The method provided in this embodiment will be described in detail.

[0057] see figure 1 and figure 2 , S301. Divide the single-frequency time-domain GNSS signal into two paths, wherein one path signal is delayed by M / 2 sampling points, and the other path signal is not delayed, and the delayed and undelayed two-path GNSS signals are respectively windowed deal with.

[0058] Specifically, the single-frequency time-domain GNSS signal is divided into two paths, and the delay module receives one of the signals and delays it by M / 2 sampling points, and sends the delayed GNSS signal to the windowing processing module, so The windowing processing module receives another GNSS signal and the delayed GNSS signal of M / 2 sampling points sent by the delay module, and multiplies it by the same windowing coefficient obtained by searching in the windowing functi...

Embodiment 3

[0064] Embodiment 3, a multi-frequency GNSS signal narrowband interference suppression system. Combine below figure 1 as well as image 3 The system provided in this embodiment will be described in detail.

[0065] see figure 1 and image 3 , the system provided by this embodiment includes a single-frequency GNSS signal narrowband interference suppression device and at least one preprocessing module, at least one cache processing module, at least one cache control module, multiplexing module, demultiplexing module and time division multiplexing control module .

[0066] The preprocessing module includes a format conversion unit and a signal detection unit for receiving unprocessed GNSS signals, and the format conversion unit converts GNSS signals of different bit widths and different encoding formats into the same GNSS signal in the RF clock domain Bit width and encoding format, the signal detection unit performs interference signal detection on the format-converted GNSS ...

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Abstract

The invention discloses a device, a system and a method for narrowband interference suppression of single-frequency and multi-frequency GNSS signals, wherein the system for the narrowband interference suppression of the multi-frequency GNSS signals comprises at least one pre-processing module, at least one buffer-processing module, at least one buffer-control module, at least one delay module, a multiplexing module, a windowing processing module, an FFT calculation module, an NBI filtering processing module, an IFFI calculation module, a de-multiplexing module, at least one superposition processing module and a time-division multiplexing control module. The device, the system and the method for the narrowband interference suppression of the single-frequency and multi-frequency GNSS signals disclosed by the invention can realize the narrowband interference suppression of the single-frequency and multi-frequency GNSS signals, realize good interference effects, can also reduce hardware resource cost and system power consumption, and have strong practicability.

Description

technical field [0001] The invention relates to the technical field of satellite navigation digital signal processing, in particular to a single-frequency and multi-frequency GNSS signal narrowband interference suppression device, system and method thereof. Background technique [0002] Global Navigation Satellite System (GNSS) signals provide all-weather, real-time, continuous high-precision position information, speed and time information around the world, and play an increasingly important role in people's lives. [0003] GNSS signals adopt spread spectrum communication technology, which has strong anti-interference ability, and its anti-interference ability is determined by the spread spectrum processing gain and bandwidth. However, in actual communication, the anti-interference ability of spread spectrum communication is limited due to the limitation of signal transmission power, equipment implementation cost and the cost of increasing bandwidth. The GNSS signal arrivi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S19/21G01S19/37H04B1/71
CPCG01S19/21G01S19/37H04B1/7102
Inventor 肖永田马百良王志国李廷王庆海莫钧屠恩源
Owner WUHAN MENGXIN TECH CO LTD
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