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Wind profiler radar phase encoding method and circuit based on Frank codes

A wind profile radar and phase encoding technology, applied in the field of frequency synthesis circuits, can solve the problems that the number of two complementary code sub-pulses cannot be flexibly selected, and the number of radar cycles cannot be flexibly selected, so as to meet the requirements of reducing bandwidth, reduce bandwidth, and transmit The effect of spectral satisfaction

Active Publication Date: 2015-09-16
BEIJING INST OF RADIO MEASUREMENT
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0020] Aiming at the deficiencies of the prior art, the present invention discloses a wind profile radar phase encoding method and circuit based on Franck codes, so that the method and circuit of the present invention have better anti-radio spot frequency compared with the prior art. The ability to interfere with signals can solve the problem that the number of two-complementary code sub-pulses cannot be flexibly selected, and the number of radar cycles of the Walsh code in the radar coding cycle cannot be flexibly selected, so that it can be used more widely

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  • Wind profiler radar phase encoding method and circuit based on Frank codes
  • Wind profiler radar phase encoding method and circuit based on Frank codes
  • Wind profiler radar phase encoding method and circuit based on Frank codes

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Embodiment 1

[0171] A portable L-band boundary layer wind profiler radar, operating at f 0 =1320MHz, the maximum detection height R max =3km, the wind speed measurement range is 0~60m / s (maximum wind speed V max =60m / s), the high mode distance resolution is D=120m, the high mode adopts phase encoding, the maximum duty cycle of the transmitted pulse Duty_cycle=10%, and the oblique beam inclination angle α=14.8°.

[0172] Range delay τ Rmax According to the maximum detection height R max Calculated, τ Rmax = 2R max / C=20μS, C is the speed of light, the radar period T of the designed wind profiler radar r =50μS, which can meet the needs of the distance range, and T r >>τ Rmax , the total width of the transmitted pulse τ PulseAll If the allowable value is large, a pulse train waveform can be used, and the sub-pulse interval is twice the sub-pulse width. see figure 1 and its description, figure 1 Indicates the total width τ of the transmitted pulse in a radar cycle PulseAll , range de...

Embodiment 2

[0198] A stationary L-band boundary layer wind profiler radar, operating at f 0 =1320MHz, the maximum detection height R max = 6km, the wind speed measurement range is 0 ~ 60m / s (maximum wind speed V max =60m / s), the distance resolution of the high mode is D=120m, the high mode adopts phase encoding, the maximum duty cycle of the transmitted pulse Duty_cycle=10%, and the oblique beam inclination angle α=14.8°.

[0199] Range delay τ Rmax According to the maximum detection height R max Calculated, τ Rmax = 2R max / C=40μS, C is the speed of light, and the radar cycle T of the designed wind profiler radar r =80μS, can meet the needs of distance range delay, T r >>τ Rmax , the total width of the transmitted pulse τ PulseAll A larger value is allowed, and a pulse train waveform can be used, and the sub-pulse interval is twice the sub-pulse width. see figure 1 and its description, figure 1 Indicates the total width τ of the transmitted pulse in a radar cycle PulseAll , r...

Embodiment 3

[0225] A stationary L-band boundary layer wind profiler radar, operating at f 0 =1320MHz, the maximum detection height R max =10km, the wind speed measurement range is 0-80m / s (maximum wind speed V max =80m / s), the high mode distance resolution is D=240m, the high mode adopts phase encoding, the maximum duty cycle of the transmitted pulse Duty_cycle=10%, and the oblique beam inclination angle α=14.8°.

[0226] Range delay τ Rmax According to the maximum detection height R max Calculated, τ Rmax = 2R max / C=66.7μS, C is the speed of light, the radar period T of the designed wind profiler radar r =100μS, which can meet the needs of the distance range, T r >>τ Rmax , the total width of the transmitted pulse τ PulseAll The maximum value is 33.3μS, and the emission pulse can adopt pulse waveform. see figure 1 and its description, figure 1 Indicates the total width τ of the transmitted pulse in a radar cycle PulseAll , range delay τ Rmax and the radar period T r Relati...

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Abstract

The invention relates to the technical field of wind profiler radar waveform design, signal processing, waveform generation method and frequency synthesizer circuit. The invention first provides a wind profiler radar phase encoding method and circuit based on Frank codes. The method comprises the steps that the number M of encoding sub-pulses is calculated; a time domain accumulation number Nc is calculated; an encoding cycle number N is selected; the time domain accumulation number Nc and the encoding cycle number N are adjusted to form an encoding matrix FN'*M; and the encoding matrix FN'*M is used to carry out phase encoding of transmitted pulses of an encoding cycle. A wind profiler radar is used for detecting wind direction, wind speed, echo intensity and other meteorological information of an atmospheric wind field. In the prior art, two-phase complementary codes, Walsh function codes or other phase encoding technologies are used to realize width pulse energy and narrow pulse resolution at the same time. The encoding method and circuit, which are provided by the invention, use ordinary pulse or pulse burst waveform, have the advantages of low distance sidelobe and flexible selection of the number of the sub-pulses, can be used to prevent point frequency radio interference, and are suitable for a variety of wind profiler radars.

Description

technical field [0001] The invention discloses a phase encoding method and circuit of a wind profile radar based on Franck codes, and relates to the technical fields of waveform design, signal processing, waveform generation method and frequency synthesis circuit of wind profile radar. Background technique [0002] Wind profiler radar is mainly used to detect clear-air turbulence and is a kind of weather radar. Wind profile radar mainly uses the scattering of electromagnetic waves (Bragg scattering) by atmospheric turbulence to detect physical quantities such as atmospheric wind field and obtain wind profile and other data. Compared with the traditional spherical wind measurement, the wind profiler radar can obtain continuous real-time basic data with high temporal and spatial resolution. [0003] Wind profiler radar generally adopts the working system of phased array fully coherent pulse radar, adopts five beams to detect in turn, measures the radial wind speed of each bea...

Claims

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Application Information

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IPC IPC(8): G01S13/95G01S7/282
CPCG01S7/282G01S13/95Y02A90/10
Inventor 沈江林任迎新孙祥史永辉郭维克
Owner BEIJING INST OF RADIO MEASUREMENT
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