Wideband LFMCW system radar channel equalization method based on dominant scatterer
A channel equalization and special point technology, applied to radio wave measurement systems, instruments, etc., can solve the problems of amplitude and phase distortion, different echo broadening characteristics, and does not consider the problem of amplitude and phase distortion of transmitting and receiving channels, so as to achieve reduction The effect of developing costs, improving imaging quality, and reducing index requirements
Active Publication Date: 2016-11-09
CNGC INST NO 206 OF CHINA ARMS IND GRP
View PDF5 Cites 3 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
[0004] Method 1 can compensate the non-linearity problem of the broadband chirp signal source with relatively high precision, but the imaging quality cannot meet the ideal requirements because the amplitude and phase distortion problems existing in the transmitting and receiving channels are not considered;
[0005] The second method does not take into account the spatial variability of the target echo signal, that is, due to the amplitude and phase distortion of the transmitting and receiving channels, the echo broadening characteristics at different distances are different, resulting in imaging defocus
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
[0037] Now in conjunction with embodiment, accompanying drawing, the present invention will be further described:
[0038] figure 1 It is the realization flowchart of the present invention.
[0039] The realization steps of the present invention are as follows:
[0040] Step 1, see figure 2 , measurement of the in-band amplitude and phase characteristics of the transceiver channel
[0041] 1a) Site selection: choose an anechoic room, the interference echo around the anechoic room is at least 20dB smaller than the target echo;
[0042] 1b) Point target selection and placement: select a large-sized triangular corner reflector and place it at the minimum operating distance of the radar (when the radar far-field condition is met, the corner reflector distance R ref As close as possible to the radar), the angular anti-concave surface is aligned with the radar beam pointing. If it is a digital array radar, the target should be in the normal direction of the antenna array, and t...
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 discloses a wideband LFMCW system radar transmitting and receiving channel equalization algorithm, which can be widely applied to products such as a wideband LFMCW imaging radar and a wideband LFMCW digital array radar. The problem that the traditional wideband LFMCW system has harsh demands on in-band amplitude-phase design indexes of a transmitting and receiving channel can be solved, and transmitting and receiving channel equalization compensation is carried out in an echo domain through a software method. The algorithm makes full use of a dominant scatterer for a system transmitting and receiving channel in-band amplitude-phase feature test, multiple times of transformation are carried out in the echo data domain, channel equalization is carried out, and the system imaging quality is greatly improved. The method of the invention is characterized in that the transmitting and receiving channel in-band amplitude-phase design index demands are reduced; defects of hardware are compensated through the algorithm; the research cost can be effectively reduced; and the algorithm is totally based on FFT transformation, and thus, the calculation amount is small.
Description
technical field [0001] The invention relates to the field of wideband LFMCW (Linear Frequency Modulation Continuous Wave) radar signal processing, and proposes a new channel equalization method based on the in-band amplitude and phase characteristic test of the special point channel and the measured data skew and deskewing transformation, which can be widely used It is used in wideband LFMCW imaging radar, wideband LFMCW digital array radar and other products. Background technique [0002] Compared with the traditional wideband pulse Doppler (PD) system radar, the Linear Frequency Modulation Continuous Wave (LFMCW) system radar has outstanding advantages such as low transmission power, low intercept probability, small echo signal bandwidth, and low sampling rate. Ranging and imaging fields are widely used. Chirp signal is an earlier and simpler signal form. Linearity is an important index to measure the quality of chirp source. Its frequency linearity directly affects the i...
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 IPC IPC(8): G01S7/41
CPCG01S7/41
Inventor 罗丁利蔡兴雨王勇杨磊于迎春王亚军
Owner CNGC INST NO 206 OF CHINA ARMS IND GRP