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Ground penetrating radar distributed filtering method based on FPGA
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A ground-penetrating radar and distributed technology, applied to radio wave measurement systems, instruments, etc., can solve the problems of low signal processing efficiency, achieve the effects of reduced logic delay, low solution efficiency, and suppressed noise
Active Publication Date: 2019-07-12
DALIAN ZHONGRUI SCI & TECH DEV
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[0003] The purpose of the present invention is to solve the low problem of signal processing efficiency that exists when the existing filter method is realized in FPGA
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specific Embodiment approach 1
[0020] Specific implementation mode one: as figure 1 As shown, a kind of FPGA-based ground penetrating radardistributed filtering method described in this embodiment, the method comprises the following steps:
[0021] Step 1, obtain filter related parameters and data word length of GPR filtering; Said filter related parameters include cut-off frequency, sampling frequency, filter order number and filter coefficient; Described data word length includes impulse responseword length and the word length of the input data;
[0022] Step 2, adding the filter coefficient and the binary address combination to obtain a partial product, and storing the obtained partial product and the corresponding binary address into a lookup table;
[0023] Step 3: Simplify the input data by adding in advance to obtain the simplified input data;
[0024] Step 4. Carry out a bit-by-bit right shift operation on the simplified input data to splicing into a search address, and obtain a partial product ...
specific Embodiment approach 2
[0027] Embodiment 2: This embodiment differs from Embodiment 1 in that: the order of the filter is 2N, the word length of the input data is T, and the word length of the filter coefficient is also T.
specific Embodiment approach 3
[0028] Specific implementation mode three: the difference between this implementation mode and specific implementation mode two is: the specific process of said step two is:
[0029] For an FIR filter with an order of 2N, the N groups of symmetrical filter coefficients of the FIR filter are C 0 、C 1 、C 2 ,...,C N-1 , where: C 0 、C 1 、C 2 ,...,C N-1 Represent the first group, the second group, the third group, ..., the Nth group of symmetrical filter coefficients;
[0030] The filter coefficient of the FIR filter with order 2N is C 0 、C 1 ,...,C N-1 ,...,C 2N-1 , that is, a total of 2N, because the 2N coefficients of the FIR filter are symmetrically equal from the beginning to the end, that is, C 0 =C 2N-1 、C 1 =C 2N-2 , ..., so 2N coefficients can be written as N sets of symmetrical filter coefficients, respectively: C 0 、C 1 、C 2 ,...,C N-1 ;
[0031] The input address of the lookup table is an N-bit binary address {B 0 , B 1 , B 2 ,...,B N-1}, B 0 , B...
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Abstract
The invention discloses a ground penetrating radardistributed filtering method based on an FPGA, and belongs to the technical field of signalprocessing of ground penetrating radars. The problem thatthe signalprocessing efficiency is low when an existing filtering method is achieved in an FPGA is solved. According to the invention, a distributed algorithm is applied to realize digital filteringin the FPGA; the distributed structure utilizes the characteristic that binary data can be processed bit by bit. The same bit of the input data is taken as an address to search a pre-addition resultpre-stored in advance; shifting operation is carried out on the partial product output by the lookup table; according to the method, rich memory resources are used for replacing limited hardware multiplier resources, and quick table look-up operation and shifting operation are used for replacing slow multiplication operation, so that the problem that the signalprocessing speed is low in the existing method is solved. The method can be applied to the technical field of signal processing of ground penetrating radars.
Description
technical field [0001] The invention belongs to the technical field of signal processing of ground penetrating radar, and in particular relates to a distributed filtering method of ground penetrating radar. Background technique [0002] Ground penetrating radar is a non-destructive testing instrument used for shallow surface geophysical research. Using the different characteristics of electromagnetic properties of underground materials, inspectors can collect and process high-speed and high-frequency ground-penetrating radar echo data through FPGA to understand the underground situation. In actual operation, since ground penetrating radar is often used to perform road layer detection, water depth and ice thickness detection and other tasks, underground metal and floating objects in water will introduce clutter interference, so it is necessary to filter echoes during detection construction. appears to be very important. However, when the existing filtering method is impleme...
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