High-precision digital filter applicable to strapdown inertial navigation

A strapdown inertial navigation and digital filter technology, applied in directions such as navigation through speed/acceleration measurement, can solve problems such as difficult high-speed analog signal quantization

Inactive Publication Date: 2015-11-18
HARBIN ENG UNIV
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Problems solved by technology

Due to the limitation of the analog input bandwidth of a single ADC, this

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  • High-precision digital filter applicable to strapdown inertial navigation
  • High-precision digital filter applicable to strapdown inertial navigation
  • High-precision digital filter applicable to strapdown inertial navigation

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Embodiment Construction

[0027] The present invention is an FPGA-based data acquisition device, mainly because the high-speed serial data stream output by the sigma-delta analog-to-digital converter modulator needs to pass through a series of filtering and extraction to obtain the available acceleration data for the navigation computer. The implementation of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0028] Such as figure 1 As shown, the 8kHz data stream output by the Σ-△ modulator first passes through the CIC filter with a sampling rate of 10. This filter is the first stage. Its structure is simple and the downsampling rate is relatively high, but the attenuation in the passband is serious. Therefore, the CIC compensation filter is used as the post-stage filter of the CIC filter, and a 2-fold decimation is realized. The amplitude-frequency response of this stage filter is the reciprocal of the amplitude-frequency response of the C...

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Abstract

The invention discloses a high-precision acceleration DAC (digital-to-analogue conversion) digital filter applicable to strapdown inertial navigation and relates to the field of data acquisition. The filter comprises a sampling comb filter, an FIR double-extraction compensation filter and an FIR quadruple-extraction compensation filter, wherein the sampling comb filter adopts an efficient down-sampling filter structure put forward by Hogenauer and is used for realizing high-rate underclocking; the FIR double-extraction compensation filter is generated through a fir2 function in the matlab, the function can design a multi-band random response curve phase FIR filter, the filter is mainly used for compensating the pre-stage CIC (cascaded integrator comb) filter with attenuation on band margins and realizing double extraction; the FIR quadruple-extraction compensation filter calculates coefficients of the optimal filter with the Parks-McClellan algorithm, and the filter is low in pass band ripple, narrow in transition band, large in stop band attenuation and high in filter order. The high-precision digital filter meets the strapdown inertial navigation system data sampling requirement.

Description

1. Technical field [0001] The present invention relates to a strapdown inertial navigation system data acquisition device, more particularly, adopts FPGA with high performance and high flexibility, through the design of multi-stage filter bank, and realizes with complicated algorithm and is applicable to strapdown inertial navigation system High-precision data acquisition for navigation. 2. Background technology [0002] In view of the Field Programmable Gate Array (Field Programmable Gate Array, FPGA) has the characteristics of flexible design, high integration, high reliability, and hardware programming, and can be programmed through VHDL hardware description language. It has powerful functions, flexible design, fast computing speed, and real-time Strong performance, so it has the conditions and advantages of high-speed data processing. The way FPGA processes data is based on hardware parallel processing, and has great flexibility, and can develop a very specific hardware...

Claims

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Application Information

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IPC IPC(8): G01C21/16
CPCG01C21/16
Inventor 高伟王国臣张卓夏秀玮卢宝峰
Owner HARBIN ENG UNIV
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