CN103986535A - Device for testing acceptable frequency offset of receiver - Google Patents
Device for testing acceptable frequency offset of receiver Download PDFInfo
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- CN103986535A CN103986535A CN201410233763.0A CN201410233763A CN103986535A CN 103986535 A CN103986535 A CN 103986535A CN 201410233763 A CN201410233763 A CN 201410233763A CN 103986535 A CN103986535 A CN 103986535A
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Abstract
The invention discloses a device for testing the acceptable frequency offset of a receiver. The device is characterized in the device comprises a band-pass filter with the input end connected with a transmitter, the output end of the band-pass filter is connected with an AD converter, the AD converter is connected with a memory, the memory is connected with a variable-frequency playback module with the output frequency variable, the variable-frequency playback module comprises a DA converter and a direct digital frequency synthesizer, the input end of the DA converter is respectively connected with the memory and the output end of the direct digital frequency synthesizer, the output end of the DA converter is connected with the input end of the receiver through a signal conditioning circuit, and the input end of the direct digital frequency synthesizer is connected with the output end of the receiver through a numerical value comparator. The device is simple in structure, and the acceptable frequency offset index of the receiver can be measured conveniently without intervening in an original circuit of the receiver.
Description
Technical field
The present invention relates to a kind of test receiver and can accept the device of frequency shift (FS).
Background technology
Receiver generally comprises antenna, filter, and amplifier, A/D converters etc. need measuring receiver can accept the technical indicators such as frequency shift (FS) in receiver performance index test.Because the centre frequency of various communication modules, modulation system etc. are different, and the message frame form of communication also has very big-difference, and the simulation that realizes transmitter signal is difficulty comparatively.In the performance parameter test process of the transceiver communication modules such as carrier wave, small wireless, often can run into the centre carrier frequency that test side cannot change transmitter, and cause receiver can accept frequency shift (FS) index, cannot test.By changing the circuit parameter of transmitter, change the frequency shift (FS) receptivity that its tranmitting frequency detects receiver, this mode often needs the technical support of communication equipment producer, needs broken ring and gets involved communication module, and it is complicated and do not have a versatility that test process becomes.
Summary of the invention
For the problems referred to above, the invention provides the device that a kind of test receiver can be accepted frequency shift (FS), simple in structure, in the situation that staying out of the original circuit of receiver, be convenient for measuring the frequency shift (FS) the accepted index of receiver.
For realizing above-mentioned technical purpose, reach above-mentioned technique effect, the present invention is achieved through the following technical solutions:
A kind of test receiver can be accepted the device of frequency shift (FS), it is characterized in that, comprise the band pass filter that input is connected with transmitter, the output of described band pass filter is connected with AD converter, described AD converter is connected with a memory, described memory is connected with the variable frequency playback module that can change output frequency, described variable frequency playback module comprises DA transducer and Direct Digital Synthesizer, described DA transducer input respectively with memory, the output of Direct Digital Synthesizer is connected, DA converter output end is connected with receiver inlet by signal conditioning circuit, the input of described Direct Digital Synthesizer is connected with the output of receiver by numerical value comparative device.
The modulation signal with modulation intelligence that transmitter sends is sent to band pass filter, can be for different channels bandwidth and carrier frequency, pass band width and the centre frequency of band pass filter are set, the signal receiving is carried out to bandpass filtering, improve signal to noise ratio, improve the anti-aliasing ability of follow-up AD converter.AD converter is carried out high-speed sampling to band pass filter output signal, the analog-to-digital conversion of settling signal, preferably more than the twice of sample frequency higher than modulation signal bandwidth, the feature that can keep original signal, the digital signal of sampling is stored in high-capacity and high-speed memory, complete the digitized process of transmitter output signal sampling.
Variable frequency playback module completes the digital-to-analogue conversion process of transmitter output signal, during due to sampling, signal characteristic is included in data, the data of mass memory stores are exactly the data that comprise signal useful component of sampling, and these data are exported by DA transducer, complete digital to analog conversion.The analog carrier signal that variable frequency playback module produces is sent into signal conditioning circuit, carries out signal smoothing filtering processing, and signal is carried out to amplitude arrangement, makes it to meet the requirement of receiver test to signal level.Variable frequency playback module inside is except high-speed D/A converters, also has a Direct Digital Synthesizer, adopt Direct Digital, produce the refresh clock of high-speed D/A converters, the Data Comparison error signal that Direct Digital Synthesizer can be exported by numerical value comparative device, change its output frequency, thereby change the refresh rate of the built-in DA transducer of variable frequency playback module.
Numerical value comparative device word for word contrasts the demodulating data of input and the normal data of original storage, thereby judgement receives correctness and the error rate of data.Numerical value comparative device output error signal, to Direct Digital Synthesizer, changes the output frequency of Direct Digital Synthesizer.
When the playback frequency of variable frequency playback module DA transducer equals sample frequency, the frequency of output signal is not done to change; When changing the playback frequency of variable frequency playback module DA transducer, the frequency of output signal changes.If playback frequency is higher than sample frequency, output signal frequency uprises, on the contrary output signal frequency reduce, thereby realize the change of playback frequency.
Can the signal of judgement variable frequency playback module meet the requirement that receiver effective frequency range detects, first the playback frequency of setting variable frequency playback module equals the sample frequency of high-speed sampling AD converter module, the receivable center frequency signal of signal conditioning circuit output receiver, can the result that the judgement of numerical value comparative device receives meet the demands, increase or reduce again the playback frequency of variable frequency playback module, the signal that the receivable centre frequency of signal conditioning circuit output receiver departs from, can the result that numerical value comparative device continues judgement reception meet the demands, until receiver cannot normally receive, the frequency that is upwards offset and offsets downward of variable frequency playback module is subtracted each other, tested receiver can be obtained and frequency shift (FS) index can be accepted.
The invention has the beneficial effects as follows: simple in structure, in the situation that staying out of the original circuit of receiver, be convenient for measuring the frequency shift (FS) the accepted index of receiver.
Accompanying drawing explanation
Fig. 1 is the structured flowchart that a kind of test receiver of the present invention can be accepted the device of frequency shift (FS).
Embodiment
Below in conjunction with accompanying drawing and specific embodiment, technical solution of the present invention is described in further detail, so that those skilled in the art can better understand the present invention also, can be implemented, but illustrated embodiment is not as a limitation of the invention.
As shown in Figure 1, a kind of test receiver can be accepted the device of frequency shift (FS), comprises the band pass filter that input is connected with transmitter, and the output of described band pass filter is connected with AD converter, and wherein preferably AD converter is AD9235, realizes high sampling rate.Described AD converter is connected with a memory, and described memory is connected with the variable frequency playback module that can change output frequency, and preferably memory is high-capacity and high-speed memory, and such as FLASH, DRAM etc., capacity is generally greater than 2G.Described variable frequency playback module comprises DA transducer and Direct Digital Synthesizer, and DA transducer can be AD9754.Described DA transducer input is connected with the output of memory, Direct Digital Synthesizer respectively, DA converter output end is connected with receiver inlet by signal conditioning circuit, and the input of described Direct Digital Synthesizer is connected with the output of receiver by numerical value comparative device.Wherein, Direct Digital Synthesizer and numerical value comparative device can have been bought on market, belong to prior art.
The modulation signal with modulation intelligence that transmitter sends is sent to band pass filter, can be for different channels bandwidth and carrier frequency, pass band width and the centre frequency of band pass filter are set, the signal receiving is carried out to bandpass filtering, improve signal to noise ratio, improve the anti-aliasing ability of follow-up AD converter.AD converter is carried out high-speed sampling to band pass filter output signal, the analog-to-digital conversion of settling signal, preferably more than the twice of sample frequency higher than modulation signal bandwidth, the feature that can keep original signal, the digital signal of sampling is stored in high-capacity and high-speed memory, complete the digitized process of transmitter output signal sampling.
Variable frequency playback module completes the digital-to-analogue conversion process of transmitter output signal, during due to sampling, signal characteristic is included in data, the data of mass memory stores are exactly the data that comprise signal useful component of sampling, and these data are exported by DA transducer, complete digital to analog conversion.The analog carrier signal that DA transducer produces is sent into signal conditioning circuit, carries out signal smoothing filtering processing, and signal is carried out to amplitude arrangement, makes it to meet the requirement of receiver test to signal level.Variable frequency playback module inside is except high-speed D/A converters, also has a Direct Digital Synthesizer, adopt Direct Digital, produce the refresh clock of high-speed D/A converters, the Data Comparison error signal that Direct Digital Synthesizer can be exported by numerical value comparative device, change its output frequency, thereby change the refresh rate of the built-in DA transducer of variable frequency playback module.
Numerical value comparative device word for word contrasts the demodulating data of input and the normal data of original storage, thereby judgement receives correctness and the error rate of data.Numerical value comparative device output error signal, to Direct Digital Synthesizer, changes the output frequency of Direct Digital Synthesizer.
When the playback frequency of variable frequency playback module DA transducer equals sample frequency, the frequency of output signal is not done to change; When changing the playback frequency of variable frequency playback module DA transducer, the frequency of output signal changes.If playback frequency is higher than sample frequency, output signal frequency uprises, on the contrary output signal frequency reduce, thereby realize the change of playback frequency.
Can the signal of judgement variable frequency playback module meet the requirement that receiver effective frequency range detects, first the playback frequency of setting variable frequency playback module equals the sample frequency of high-speed sampling AD converter module, the receivable center frequency signal of signal conditioning circuit output receiver, can the result that the judgement of numerical value comparative device receives meet the demands, increase or reduce again the playback frequency of variable frequency playback module, the signal that the receivable centre frequency of signal conditioning circuit output receiver departs from, can the result that numerical value comparative device continues judgement reception meet the demands, until receiver cannot normally receive, the frequency that is upwards offset and offsets downward of variable frequency playback module is subtracted each other, tested receiver can be obtained and frequency shift (FS) index can be accepted.
In the situation that staying out of the original circuit of receiver, realize the effective measurement that can accept frequency shift (FS) index to the receiver of different carrier frequencies and modulation system, be particularly suitable for the detection of the communication module performance that the communication frequencys such as power line carrier are lower.
These are only the preferred embodiments of the present invention; not thereby limit the scope of the claims of the present invention; every equivalent structure or conversion of equivalent flow process that utilizes specification of the present invention and accompanying drawing content to do; or be directly or indirectly used in other relevant technical fields, be all in like manner included in scope of patent protection of the present invention.
Claims (6)
1. a test receiver can be accepted the device of frequency shift (FS), it is characterized in that, comprise the band pass filter that input is connected with transmitter, the output of described band pass filter is connected with AD converter, described AD converter is connected with a memory, described memory is connected with the variable frequency playback module that can change output frequency, described variable frequency playback module comprises DA transducer and Direct Digital Synthesizer, described DA transducer input respectively with memory, the output of Direct Digital Synthesizer is connected, DA converter output end is connected with receiver inlet by signal conditioning circuit, the input of described Direct Digital Synthesizer is connected with the output of receiver by numerical value comparative device.
2. a kind of test receiver according to claim 1 can be accepted the device of frequency shift (FS), it is characterized in that, described memory is FLASH.
3. a kind of test receiver according to claim 1 can be accepted the device of frequency shift (FS), it is characterized in that, described memory is DRAM.
4. according to a kind of test receiver described in claim 2 or 3, can accept the device of frequency shift (FS), it is characterized in that, described AD converter is AD9235.
5. a kind of test receiver according to claim 4 can be accepted the device of frequency shift (FS), it is characterized in that, described memory span is greater than 2G.
6. a kind of test receiver according to claim 5 can be accepted the device of frequency shift (FS), it is characterized in that, described DA transducer is AD9754.
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| CN103986535B CN103986535B (en) | 2015-12-30 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109683513A (en) * | 2018-12-11 | 2019-04-26 | 天津津航计算技术研究所 | 100,000,000 1553B of one kind hair control simulated-bus front end |
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| CN1217839A (en) * | 1997-03-04 | 1999-05-26 | 三菱电机株式会社 | Receiver with frequency-deviation correcting function |
| CN101087159A (en) * | 2006-06-05 | 2007-12-12 | 中兴通讯股份有限公司 | A method for frequency deviation estimation |
| CN101729082A (en) * | 2008-10-31 | 2010-06-09 | 原相科技股份有限公司 | Centre frequency adjusting device for communication receiver and related method thereof |
| CN102986292A (en) * | 2010-01-26 | 2013-03-20 | 新加坡科技研究局 | Method and device for estimating carrier frequency offset |
| US20130225110A1 (en) * | 2012-02-23 | 2013-08-29 | Agilent Technologies, Inc. | Downconversion of comb spectrum |
| CN203851150U (en) * | 2014-05-29 | 2014-09-24 | 国家电网公司 | Apparatus for testing acceptable frequency offset of receiver |
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2014
- 2014-05-29 CN CN201410233763.0A patent/CN103986535B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1217839A (en) * | 1997-03-04 | 1999-05-26 | 三菱电机株式会社 | Receiver with frequency-deviation correcting function |
| CN101087159A (en) * | 2006-06-05 | 2007-12-12 | 中兴通讯股份有限公司 | A method for frequency deviation estimation |
| CN101729082A (en) * | 2008-10-31 | 2010-06-09 | 原相科技股份有限公司 | Centre frequency adjusting device for communication receiver and related method thereof |
| CN102986292A (en) * | 2010-01-26 | 2013-03-20 | 新加坡科技研究局 | Method and device for estimating carrier frequency offset |
| US20130225110A1 (en) * | 2012-02-23 | 2013-08-29 | Agilent Technologies, Inc. | Downconversion of comb spectrum |
| CN203851150U (en) * | 2014-05-29 | 2014-09-24 | 国家电网公司 | Apparatus for testing acceptable frequency offset of receiver |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109683513A (en) * | 2018-12-11 | 2019-04-26 | 天津津航计算技术研究所 | 100,000,000 1553B of one kind hair control simulated-bus front end |
| CN109683513B (en) * | 2018-12-11 | 2020-02-14 | 天津津航计算技术研究所 | Hundred-million 1553B launch control bus analog front end |
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| CN103986535B (en) | 2015-12-30 |
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