CN207382314U

CN207382314U - A kind of number USB answering machines

Info

Publication number: CN207382314U
Application number: CN201721256837.8U
Authority: CN
Inventors: 康国栋; 周胜; 宁金枝; 窦骄; 李晓宁; 黄繁荣
Original assignee: Aerospace Dongfanghong Satellite Co Ltd
Current assignee: Aerospace Dongfanghong Satellite Co Ltd
Priority date: 2017-09-27
Filing date: 2017-09-27
Publication date: 2018-05-18
Anticipated expiration: 2027-09-27

Abstract

A kind of number USB answering machines of the utility model, including two pieces of veneers of rf board and baseband board；Rf board includes clock circuit, radiofrequency emitting module and Receiver Module；The baseband board includes power module, digital baseband, slave computer；Clock circuit is baseband board, Receiver Module, radiofrequency emitting module provide clock respectively；Radiofrequency emitting module and Receiver Module complete the transmitting and reception of USB answering machine signals by Microwave Net；Digital baseband is connected respectively with radiofrequency emitting module and Receiver Module；Power module is introduced from outside into primary power source busbar voltage and after power supply is converted, and required voltage is provided for each unit on rf board and baseband board；Slave computer completes the communication of satellite house keeping computer and other execution units.

Description

A kind of number USB answering machines

Technical field

The utility model is related to a kind of number USB answering machines.

Background technology

With the development of information technology, small satellite communication device miniaturization, Design of digital have become a kind of necessary trend. Traditional moonlet USB answering machines are designed using analog device, and production debugging is more difficult, and product weight and power consumption It is larger.Simulation USB answering machines itself do not possess slave computer function, and the telemetering of answering machine itself need to be carried out by external other equipment Telemetering assisted acquisition.

Miniature digital USB answering machines are also more rare at home at present.

Utility model content

The utility model solve the technical issues of be：A kind of number USB responses are overcome the deficiencies of the prior art and provide Machine, solves the digitized processing of USB answering machine intermediate-freuqncy signals and the slave computer of itself telemetering gathers.

The technical solution of the utility model is：A kind of number USB answering machines, only including two pieces of lists of rf board and baseband board Plate；

The rf board includes clock circuit, radiofrequency emitting module and Receiver Module；The baseband board includes power supply Module, digital baseband, slave computer；

Clock circuit is baseband board, Receiver Module, radiofrequency emitting module provide clock respectively；

Radiofrequency emitting module and Receiver Module complete the transmitting and reception of USB answering machine signals by Microwave Net；

Digital baseband is connected respectively with radiofrequency emitting module and Receiver Module；

Power module is introduced from outside into primary power source busbar voltage and after power supply is converted, and is each on rf board and baseband board Voltage needed for unit offer；

Slave computer completes the communication of satellite house keeping computer and other execution units.

The digital baseband includes FPGA, A/D module and D/A modules；A/D modules and D/A modules are connected respectively with FPGA.

The slave computer selects ARM chips LPC2292.

The A/D modules of the digital baseband select the AD9627 of ADI companies；

The D/A modules of the digital baseband select the AD9767 of ADI companies；

The digital baseband FPGA is FLASH types A3PE3000.

The utility model compared with prior art the advantages of be：

The utility model compared with prior art the advantages of：Equipment has been carried out digitlization, Miniaturization Design by system.With biography System simulation USB answering machines are compared：

1) Microwave Net is directly realized in radio-frequency channel, and design simplifies, weight saving；

2) original analog circuit is substituted using a piece of FPGA, completes AD samplings, PM demodulation, BPSK subcarrier demodulation PM tune A series of tasks such as system；

3) slave computer function is added, for gathering itself telemetering；

4) unit weight is reduced by 3.4kg to 400g；

5) unit size is reduced by 202mm × 90mm × 140mm to 96mm × 99.2mm × 1.57mm；

3) unit power consumption is reduced by 11W to 6W.

Description of the drawings

Fig. 1 answering machines form and interface framework；

Fig. 2 answering machine baseband board composition frame charts.

Specific embodiment

A kind of number USB answering machines, are made of two blocks of PC104 plates, are respectively rf board and baseband board.When rf board includes Clock circuit, Microwave Net, radiofrequency emitting module, Receiver Module.Baseband board includes power supply, digital baseband, slave computer module.

Clock circuit generates three road 20MHz clocks, is respectively supplied to Receiver Module, radiofrequency emitting module, digital base Band.Microwave Net is realized to simplify design directly in radio-frequency channel and mitigates weight.Baseband board digital baseband is by downlink intermediate frequency Signal send rf board transmitting module, and the radiofrequency signal generated after up-conversion, rf filtering, power amplification is sent to microwave network Network is transmitted to ground control station by antenna, forms downlink.Rf board receiving module penetrates the uplink from ground control station After frequency signal carries out bandpass filtering, low noise amplification, down coversion, intermediate frequency filtering, intermediate-freuqncy signal amplification and AGC controls, generation Intermediate-freuqncy signal send digital baseband to carry out A/D samplings.

Baseband board digital baseband core devices FPGA is a piece of 3,000,000 FLASH types A3PE3000.Baseband board digital baseband FPGA will complete a series of tasks such as PM demodulation, BPSK subcarrier demodulations PM modulation, while be also responsible for and each external interface Communication.If sampling input signal carries out a down coversion by receiving channel to upstream radio-frequency signal, believes through intermediate frequency filtering, intermediate frequency Number amplification and AGC control after obtain, it comprises uplink remote informations and range tone information.Intermediate-freuqncy signal after AD is sampled, The capture and tracking to carrier wave are realized into PM demodulation modules.Carrier frequency variation is tracked by frequency locking ring first, is corrected local Frequency control word, adjustment local carrier frequency to be consistent with input signal carrier frequency.Secondly, phaselocked loop tracking is remaining Frequency difference and phase place change, and pass through phase place and eliminate phase deviation.Afterwards, output remote control subcarrier after amplitude adjustment is passed through With range tone subcarrier.Remote control subcarrier is inputted to BPSK subcarrier demodulation modules, by carrying out bit synchronization after phaselocked loop, is obtained It is adjudicated the moment to optimal sampling, and judges whether subcarrier demodulation loop works normally by subcarrier locking decision module, it is defeated Go out pcm stream, synchronised clock and gate-control signal.Range tone subcarrier is inputted to downlink PM modulation modules and modulated by BPSK The subcarrier modulated together as PM of input telemetry, give transmission channel after DA is exported, one completed in transmission channel Secondary frequency conversion, it is achieved thereby that Design of digital.

The A/D modules of baseband board digital baseband select the AD9627 of ADI companies, and binary channels, 12, data input and clock Input using difference form, is supported to be up to the data-handling capacity of 150MSPS.With two kinds of works of CMOS patterns and LVDS mode Operation mode.

The D/A modules of baseband board digital baseband select the AD9767 of ADI companies, have two-way simulation output, turn of 14 Precision is changed, to meet output digit signals index request.

Power module after current limliting, the surge that disappears, electromagnetic interface filter, passes through with being introduced from outside into primary power source busbar voltage DC/DC carries out secondary power supply and is converted to voltage needed for the offers such as baseband board FPGA, ARM, DAC and ADC module；It is carried out by LDO Three secondary sources are converted to voltage needed for each module offer of rf board.

Baseband board slave computer selects ARM chip LPC2292, for gathering the analog telemetering amount of itself, is converted to digital shape State telemetering amount is sent by CAN bus or I2C buses to satellite house keeping computer, while is received from satellite house keeping computer Indirect instruction gives other units to perform.

Based on the design in miniaturized products, on the premise of improving reliability design as far as possible, the utility model design uses Reset mechanism, every time answering machine can all be completed once completely to reset after the power is turned on.

USB answering machine transmitters working condition includes coherent transmitting and noncoherent transmission, and uplink and downlink coherent forwarding frequency ratio is Uplink/downlink=221/240；When working under relevant and non-coherent mode, the frequency source of USB answering machine downlink carrier frequency by FPGA module provides, if coherent forwarding is judged by FPGA according to telecommand and answering machine working condition.

The content not being described in detail in the utility model specification belongs to the known technology of those skilled in the art.

Claims

1. a kind of number USB answering machines, it is characterised in that：Including two pieces of veneers of rf board and baseband board；

The rf board includes clock circuit, radiofrequency emitting module and Receiver Module；The baseband board include power module, Digital baseband, slave computer；

Power module is introduced from outside into primary power source busbar voltage and after power supply is converted, and is each unit on rf board and baseband board Voltage needed for offer；

Slave computer completes the communication of satellite house keeping computer and external execution unit.

2. a kind of number USB answering machines according to claim 1, it is characterised in that：The digital baseband includes FPGA, A/ D-module and D/A modules；A/D modules and D/A modules are connected respectively with FPGA.

3. a kind of number USB answering machines according to claim 1, it is characterised in that：The slave computer selects ARM chips LPC2292。

4. a kind of number USB answering machines according to claim 2, it is characterised in that：The A/D modules choosing of the digital baseband With the AD9627 of ADI companies.

5. a kind of number USB answering machines according to claim 2, it is characterised in that：The D/A modules choosing of the digital baseband With the AD9767 of ADI companies.

6. according to Claims 2 or 3 or a kind of 4 or 5 arbitrary number USB answering machines, it is characterised in that：The number base Band FPGA is FLASH types A3PE3000.