CN206945960U

CN206945960U - A kind of phased array weather radar signal processor mid frequency acquisition equipment

Info

Publication number: CN206945960U
Application number: CN201720668630.5U
Authority: CN
Inventors: 郭强
Original assignee: CHENGDU YUANWANG TECHNOLOGY Co Ltd
Current assignee: CHENGDU YUANWANG TECHNOLOGY Co Ltd
Priority date: 2017-06-09
Filing date: 2017-06-09
Publication date: 2018-01-30
Anticipated expiration: 2027-06-09

Abstract

The utility model discloses a kind of phased array weather radar signal processor mid frequency acquisition equipment, including power distribution module, signal attenuation module, signal amplification module, analog-to-digital conversion module, fpga chip, clock module and signal transmission module, two output ends of power distribution module electrically connect with the signal input part of signal attenuation module and the signal input part of signal amplification module respectively, the signal output part of signal attenuation module and the signal output part of signal amplification module electrically connect with the signal output part of analog-to-digital conversion module, the signal output part of analog-to-digital conversion module electrically connects with the signal input part of fpga chip, the signal output part of clock module electrically connects with the clock signal terminal of fpga chip.The utility model ensure that the balance of two channel signals using the double channels acquisition of analog-to-digital conversion module, and high accuracy, the signal acquisition of high sampling rate, improve intermediate-freuqncy signal analog-to-digital conversion quality and provide more accurately data source for back end signal processing and Radar Products generation.

Description

A kind of phased array weather radar signal processor mid frequency acquisition equipment

Technical field

It the utility model is related to weather radar, more particularly to a kind of phased array weather radar signal processor intermediate frequency collection dress Put.

Background technology

The China New Generation Weather Radar that China has arranged net at present can effectively monitor diastrous weather and send early warning letter in time Breath, but because China New Generation Weather Radar is limited by mechanical scanning system, cause sweep time is long, the sampling number of plies is very few, The defects of spatial and temporal resolution is relatively low.The temporal resolution of detection data can be improved using the weather radar of phased-array technique, profit The sweep time that can make weather radar with the weather radar of phased-array technique was reduced to tens seconds from 6 minutes, can also be right Multiple regions are observed simultaneously, so as to greatly increase the pre-alerting ability to diastrous weathers such as cyclone, heavy rains, and are shortened It is pre- to call time.

An important component of the mid frequency acquisition equipment as radar receiver, digital letter is converted into by analog signal Number, most effective data source is provided for Digital Signal Processing, wherein ADC analog-to-digital conversions are particularly important.

Two kinds of acquisition modes at this stage be present, carried out one is entering after directly being gathered by ADC inside FPGA at signal Reason, its shortcoming is SFDR<92dBc, it is impossible to meet the requirement to Larger Dynamic scope in weather radar；It is the second is logical To cross power splitter and intermediate-freuqncy signal work(is divided into two-way by Larger Dynamic scope, all the way signal fixed attenuation, another way signal fixes amplification, Two paths of signals is sampled through two-way ADC modulus conversion chips respectively, and sampled signal carries out signal transacting inside FPGA, and it is lacked Point is that every ADC chip has different othernesses, and the signal after collection can have uncontrollable factor in signal transacting, influence to lead to Road balance, later stage signal transacting difficulty are big.

Utility model content

The purpose of this utility model is that to solve the above problems and provided at a kind of phased array weather radar signal Manage device mid frequency acquisition equipment.

The utility model is achieved through the following technical solutions above-mentioned purpose：

A kind of phased array weather radar signal processor mid frequency acquisition equipment, including power distribution module, signal attenuation mould Block, signal amplification module, analog-to-digital conversion module, fpga chip, clock module and signal transmission module, the power distribution module Input input intermediate-freuqncy signal, two output ends of power distribution module signal with the signal attenuation module respectively The signal input part of input and the signal amplification module electrically connects, the signal output part of the signal attenuation module and described Signal output part of the signal output part of signal amplification module with the analog-to-digital conversion module electrically connects, the analog-to-digital conversion mould The signal output part of block electrically connects with the signal input part of the fpga chip, the signal output part of the clock module with it is described The clock signal terminal electrical connection of fpga chip, the signal end of the signal end of the fpga chip and the signal transmission module are electrically connected Connect.

Specifically, the model ADP-2-1 of the power distribution module, the model LAT-15 of the signal attenuation module +, the model HMC580ST89 of the signal amplification module, the model AD9650, the FPGA of the analog-to-digital conversion module The model xc7z020clg400 of chip, the model AD9516 of the clock module, the signal transmission module include RJ45 Network interface and SFP optical fiber.

The beneficial effects of the utility model are：

A kind of phased array weather radar signal processor mid frequency acquisition equipment of the utility model utilizes analog-to-digital conversion module Double channels acquisition ensure that the balance of two channel signals, and high accuracy, the signal acquisition of high sampling rate, improve intermediate frequency letter Number analog-to-digital conversion quality provides more accurately data source for back end signal processing and Radar Products generation, reduces product cost, Improve product integrated level.

Brief description of the drawings

Fig. 1 is a kind of structural frames of phased array weather radar signal processor mid frequency acquisition equipment described in the utility model Figure.

Embodiment

The utility model is described in further detail below in conjunction with the accompanying drawings：

As shown in figure 1, a kind of phased array weather radar signal processor mid frequency acquisition equipment of the utility model, including power Distribute module, signal attenuation module, signal amplification module, analog-to-digital conversion module, fpga chip, clock module and signal transmission mould Block, the input input intermediate-freuqncy signal of power distribution module, two output ends of power distribution module respectively with signal attenuation mould The signal input part electrical connection of the signal input part and signal amplification module of block, the signal output part and signal of signal attenuation module The signal output part of amplification module electrically connects with the signal output part of analog-to-digital conversion module, the signal output of analog-to-digital conversion module End electrically connects with the signal input part of fpga chip, and the signal output part of clock module and the clock signal terminal of fpga chip are electrically connected Connect, the signal end of fpga chip electrically connects with the signal end of signal transmission module.

Intermediate-freuqncy signal exports two paths of signals through power distribution module, and signal passes through after signal attenuation module all the way AD9650 passages 1 carry out signal acquisition, and another way signal carries out signal after signal amplification module, by AD9650 passages 2 and adopted Collection, signal transacting is carried out inside fpga chip after two paths of signals collection, i/q signal is obtained after processing and carries out rear end through optical fiber transmission Processing.

ADC selects the low-power consumption of Analog Devices companies, high precision converter AD9650BCPZ-105 in the present apparatus, AD9650 is a binary channels, 16,25MSPS/65MSPS/80MSPS/105MSPS analog-digital converters (ADC), aims at numeral Change high frequency, wide dynamic range signals and design, support that incoming frequency is up to 300MHz, using multistage, differential pipeline framework, and Output error correction logic is integrated with, each ADC is respectively provided with wide bandwidth, difference sampling keeps simulation input amplifier and shared integrated base Reference voltage source, design consideration can be simplified.

Stable duty ratio device can be used to compensate the fluctuation of ADC clock duty cycles, converter is kept outstanding performance.ADC Output data can be fed directly to two output ports of outside 16, or be multiplexed on single 16 BITBUS network.In integration slice Reference voltage source, high input impedance buffer, adjustable simulation input range and output clock simplify data acquisition.Set and control The programming of system is completed using three-wire type SPI compatible types serial line interface.

AD9650 maximums SFDR can reach 90dBc, it is impossible to meet that 120dBc is without miscellaneous in phased array weather radar Dissipate the requirement of dynamic range.In order to extend SFDR, two paths of signals, fpga chip will be divided into by intermediate-freuqncy signal work(all the way By watt level come selection signal after the signal transacting of internal receipt two-way AD9650 collections, when detection power is more than setting value When select the signal of attenuation path ADC collection to realize big signal acquisition, when detecting power and being less than setting value selection decay lead to The signal of road ADC collection realizes Collection.Balance wherein in two channel signal splicings to two channel signals It is required that it is high, so ensure that the balance of two passages is enough from AD9650 double-channel analog/digitals conversion chip in the present invention It is high.

Clock module AD9516 loading mode is that serial ports synchronously loads, and Serial Control end allows to all deposits of AD9516 The configuration of device carries out read/write, and AD9516 Serial Controls are configurable to single double I/O pins (SDIO) or two unidirectional pins (SDIO/SDO) pattern, under default mode, AD9516 is both-end pattern.The system selects both-end configuration mode, and serial line interface is Simple SPI interface, used control line are：Reading and writing data line SDIO, loading clock line SCLK, serial line interface chip select line CSB。

Zynq7000 Series FPGAs chip (xc7z020clg400) in the present invention from Xilinx companies is used as the system Controller.Chip is divided into two parts：PS (processing system) and PL (FPGA) part, have high-speed bus can between PS and PL Realize that data quickly interact, faster more efficient platform is provided for signal transacting.

Network and optic module are data interaction passage, by the I/Q data transfers after signal transacting to computer, with And receive the instruction that computer is sent and transmit to fpga chip the control for being acquired device.

The technical solution of the utility model is not limited to the limitation of above-mentioned specific embodiment, every according to skill of the present utility model The technology deformation that art scheme is made, each falls within the scope of protection of the utility model.

Claims

A kind of 1. phased array weather radar signal processor mid frequency acquisition equipment, it is characterised in that：Including power distribution module, letter Number attenuation module, signal amplification module, analog-to-digital conversion module, fpga chip, clock module and signal transmission module, the power The input input intermediate-freuqncy signal of distribute module, two output ends of the power distribution module respectively with the signal attenuation mould The signal input part of the signal input part of block and the signal amplification module electrically connects, the signal output of the signal attenuation module Signal output part of the signal output part of end and the signal amplification module with the analog-to-digital conversion module electrically connects, the mould The signal output part of number modular converter electrically connects with the signal input part of the fpga chip, the signal output of the clock module End electrically connects with the clock signal terminal of the fpga chip, the letter of the signal end of the fpga chip and the signal transmission module Number end electrical connection.
A kind of 2. phased array weather radar signal processor mid frequency acquisition equipment according to claim 1, it is characterised in that： The model ADP-2-1 of the power distribution module, the model LAT-15+ of the signal attenuation module, the signal amplification The model HMC580ST89 of module, the model AD9650 of the analog-to-digital conversion module, the model of the fpga chip Xc7z020clg400, the model AD9516 of the clock module, the signal transmission module include RJ45 network interfaces and SFP light It is fine.