CN202929213U - Compatible RF (Radio Frequency) receiving device for BD2 first stage and BD2 second stage - Google Patents
Compatible RF (Radio Frequency) receiving device for BD2 first stage and BD2 second stage Download PDFInfo
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- CN202929213U CN202929213U CN 201220514801 CN201220514801U CN202929213U CN 202929213 U CN202929213 U CN 202929213U CN 201220514801 CN201220514801 CN 201220514801 CN 201220514801 U CN201220514801 U CN 201220514801U CN 202929213 U CN202929213 U CN 202929213U
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Abstract
The utility model discloses a compatible RF receiving device for BD2 first stage and BD2 second stage, mainly composed of a power supply module, and an antenna, a low-noise amplification module, an RF module and a baseband processing module connected with the power supply module. The low-noise amplification module comprises an anti-interference filter, a first-stage amplifier, a power divider, two narrow-band filters and two second-stage amplifiers; and the RF module comprises two down converters, two band pass filters, two automatic gain controllers, two intermediate-frequency demultiplexers, four intermediate-frequency filters, a frequency synthesizer and an analog-to-digital converter. The compatible RF receiving device for BD2 first stage and BD2 second stage can solve compatibility problems generated in the transition process from being regional to global of the BD system, wherein compatible reception of first-stage and second-stage signals of BD2 is an effective approach to achieve smooth transition.
Description
Technical field
The utility model relates to the Satellite Navigation Technique field, particularly the compatible receiving trap of a kind of Big Dipper first phase and Big Dipper second phase radio frequency.
Background technology
China's Beidou satellite navigation system (BD) is after GPS of America, GLONASS, European Galileo, global the fourth-largest satellite navigation system.China's Beidou satellite navigation system will cover in 2012 the Asia-Pacific region, be Big Dipper region satellite navigation system (BD2 first phase), the year two thousand twenty will form by 30 multi-satellite networkings has ability covering the whole world, i.e. Big Dipper GPS (Global Position System) (BD2 second phase).BD is Chinese independent satellite navigation system, has both possessed the function of high precision PNT (location, navigation, time service), possesses again the short message communication function.BD will be applied to all trades and professions, and its application will be only limited to people's imagination.No matter in centre frequency, modulation system, and the aspects such as the spreading code that adopts, text all exist very large difference due to BD2 first phase signal and BD2 second phase signal.Therefore the research and development of BD receiver must consider that region satellite navigation system is to transition and the compatibility of global system, otherwise, receiver for district system just can not be used in global system, and this will not only make troubles to the user, also will increase the production cost of receiver.
The utility model content
Technical problem to be solved in the utility model is to provide a kind of Big Dipper first phase and the compatible receiving trap of Big Dipper second phase radio frequency, it can solve the compatibility issue that dipper system produces from the zone to global transient process, realizes that it is the effective way that solves smooth transition that BD2 first phase signal and BD2 second phase signal compatibility receives.
For addressing the above problem, the utility model is realized by following scheme:
A kind of Big Dipper first phase and the compatible receiving trap of Big Dipper second phase radio frequency mainly are comprised of power module and the antenna that is connected with power module, low noise amplification module, radio-frequency module and baseband signal processing module.Wherein:
Described low noise amplification module comprises anti-interference filter, first order amplifier, power splitter, 2 narrow band filters and 2 second level amplifiers; Antenna is connected on the input end of anti-interference filter, and the output terminal of anti-interference filter is connected with the input end of power splitter through first order amplifier; On 2 output terminals of power splitter, each is connected to 1 narrow band filter and 1 second level amplifier successively.
Described radio-frequency module comprises 2 low-converters, 2 bandpass filter, 2 automatic gain controllers, 2 intermediate frequency shunts, 4 intermediate-frequency filters, frequency synthesizer and analog to digital converters.Each is connected the output terminal of each second level amplifier of above-mentioned low noise amplification module through 1 low-converter, 1 bandpass filter and the input end of an automatic gain controller with 1 intermediate frequency shunt of being connected successively.Respectively be connected to 2 intermediate-frequency filters on 2 output terminals of each intermediate frequency shunt.The output terminal of above-mentioned 4 intermediate-frequency filters all is connected to the input end of analog to digital converter.The output terminal of analog to digital converter is connected with baseband signal processing module.Frequency synthesizer is connection mode number converter and 2 low-converters respectively.
In such scheme, the high stable 10MHz crystal oscillator of frequency synthesizer employing homology comprehensively goes out the required various frequencies of radio-frequency module as a reference.
In such scheme, the local frequency that frequency synthesizer provides for 2 low-converters is respectively 1490MHz and 1120MHz, and the local frequency that provides to analog to digital converter is 62MHz.
In such scheme, antenna is pasted sheet type antenna.
In such scheme, 2 automatic gain controllers all adopt analog control mode.
In such scheme, 4 intermediate-frequency filters are Surface Acoustic Wave Filter.
Compared with prior art, the utility model namely by the distribution of figuration and gain, is realized broadband, miniaturization and the anti-multipath design of antenna by the appropriate design to antenna, LNA, down-converter unit and base band.For the dirigibility of installing, low noise amplifier (LNA) and antenna independent design, LNA mainly is made of anti-interference filter, first order amplifier, narrow band filter, second level amplifier.Radio-frequency module adopts the single-conversion structure, and the selection of its frequency scheme does not produce combination frequency interference, intermodulation, Intermodulation Interference.The high stable 10MHz crystal oscillator of frequency synthesizer employing homology as a reference.For the compatibility of completing Big Dipper first phase and Big Dipper second phase signal receives, 4 intermediate-frequency filters are realized adopting Surface Acoustic Wave Filter, can guarantee stable phase and magnitude characteristic.Analog control mode is adopted in the control of AGC.Therefore the utility model can be under the prerequisite that does not increase design complexities and volume, can compatiblely receive Big Dipper first phase and Big Dipper second phase signal, realize the smooth transition of Big Dipper district system to global system, reduced the extra cost that user segment brings at system upgrade.
Description of drawings
Fig. 1 is the principle schematic of a kind of preferred Big Dipper first phase and the compatible receiving trap of Big Dipper second phase radio frequency.
Embodiment
Referring to Fig. 1, a kind of preferred Big Dipper first phase of the utility model and the compatible receiving trap of Big Dipper second phase radio frequency mainly are comprised of power module and the antenna that is connected with power module, low noise amplification module, radio-frequency module and baseband signal processing module.At work, receiver is from the antenna reception Big Dipper satellite signal, to completing positioning calculation, to pass through radio-frequency module settling signal down coversion, A/D is converted to digital intermediate frequency signal, decoded message, pseudorange extraction and the PVT of the synchronous and navigation information of baseband signal processing module settling signal calculate, and the locating information serial ports are exported at last again.
In the utility model, antenna is used for receiving Big Dipper navigation signal, then gives the low noise amplification module and amplifies.The performance quality of antenna and LNA directly has influence on receiver sensitivity, anti-multipath, the index such as anti-interference.For the compatibility of completing Big Dipper first phase and Big Dipper second phase signal receives, require the antenna broadband.In the utility model preferred embodiment, the antenna index request is as shown in table 1.
Table 1 antenna technology index
Described antenna can adopt the existing antenna structure of prior art, but for the miniaturization that realizes antenna and the figuration of wave beam, antenna of the present utility model need to use the zone according to satellite distribution and user, and antenna radiation pattern is carried out Shape design, the reasonable distribution antenna gain; And according to antenna installing space, antenna radiation pattern and performance index requirement, antenna is carried out type selecting, and carry out theoretical analysis and demonstration, calculate the antenna basic parameter.In addition, note controlling the characteristic of antenna pattern during Antenna Design, increase the anti-multipath interference performance.
In view of the requirement of antenna miniaturization, the utility model can select paster antenna to realize, paster antenna has that volume is little, and lobe is wide, is easy to the advantages such as conformal.And in order further to dwindle antenna volume, the utility model can also further adopt high dielectric constant material as antenna substrate.In addition, can expand paster antenna bandwidth (both having increased by a paster parasitic element) by double-layer paster, avoid the narrow shortcoming of paster antenna frequency band.
For the dirigibility of installing, in the utility model, low noise amplification module and antenna be independent design respectively, and as shown in table 2 for the index request of low noise amplification module:
Table 2LNA index request
In the utility model, described low noise amplification module comprises anti-interference filter, first order amplifier, power splitter, 2 narrow band filters and 2 second level amplifiers.Antenna is connected on the input end of anti-interference filter, and the output terminal of anti-interference filter is connected with the input end of power splitter through first order amplifier.On 2 output terminals of power splitter, each is connected with the input end of 1 second level amplifier by 1 narrow band filter.The power supply of low noise amplification module is by the radio-frequency cable feed-in of output.The effect of anti-interference filter is the outer undesired signal of filtering band, and for the noise objective that obtains, its Insertion Loss should be as far as possible little.First order amplifier is low noise levels, and the noise figure of LNA module is played a major role, and available microwave FET is realized.Power splitter is that two-way B1 and B2 signal are separated, and the Insertion Loss index can be loosened.The effect of narrow band filter is the limit noise bandwidth, and the Insertion Loss index can be loosened.Second level amplifier is used for providing certain gain.Its index is distributed as shown in table 3.
Table 3 LNA module indexs at different levels are distributed
In the utility model, the function of radio-frequency module is mainly carrying out down coversion, filtering, amplification from the radiofrequency signal of LNA output, being transformed into suitable intermediate-freuqncy signal to baseband signal processing module.Radio-frequency module should comprise following major function: signal amplifies, and radio frequency is to frequency conversion and the filtering of intermediate frequency, local frequency synthesis, the power supply of LNA, AGC, AD conversion.
Described radio-frequency module comprises 2 low-converters, 2 bandpass filter, 2 automatic gain controllers, 2 intermediate frequency shunts, 4 intermediate-frequency filters, frequency synthesizer and analog to digital converters.Each is connected the output terminal of each second level amplifier of above-mentioned low noise amplification module through 1 low-converter, 1 bandpass filter and the input end of an automatic gain controller with 1 intermediate frequency shunt of being connected successively.1 intermediate frequency shunt in 2 intermediate frequency shunts has 2 output terminals, respectively is connected to 1 intermediate-frequency filter on these 2 output terminals, and another 1 intermediate frequency shunt also has 2 output terminals, respectively is connected to 1 intermediate-frequency filter on these 2 output terminals.The output terminal of above-mentioned 4 intermediate-frequency filters all is connected to the input end of analog to digital converter.The output terminal of analog to digital converter is connected with baseband signal processing module.Frequency synthesizer is connection mode number converter and 2 low-converters respectively.
Adopt the single-conversion structure, to filtering and the amplification of signal, at first the selection of frequency scheme considers not produce combination frequency interference, intermodulation, Intermodulation Interference.The high stable 10MHz crystal oscillator that frequency synthesizer adopts homology comprehensively goes out the required various frequencies of module as a reference, and the frequency-multiplication phase-locked loop road is operated in the integral frequency divisioil pattern, reduces phase noise.The pass-band performance of radio-frequency module mainly is placed on the intermediate frequency filtering level and realizes, namely 5 intermediate-frequency filters all adopt Surface Acoustic Wave Filter, can guarantee stable phase and magnitude characteristic.Analog control mode is adopted in the control of AGC.
1. signal flow
Radio-frequency module carries out process LNA module amplifying signal to give baseband signal processing unit after down coversion, filtering, amplification, and provides the 62MHz clock signal to use to intermediate frequency process.Its median filter is used for limiting the Out-of-band rejection characteristic of radio-frequency channel.
2. frequency is distributed
Reasonably frequency is distributed, can make the designs simplification of circuit, obtain simultaneously noiseproof feature preferably, reference frequency is 10MHz, main combined interference, image frequency interference, intermodulation and the Intermodulation Interference of considering to reduce signal and local oscillator in frequency configuration, near nominal frequency, facilitate device to select simultaneously.Concrete frequency flow process such as table 4.
Table 4 frequency flow process
| Frequency range | Radio frequency (MHz) | Radio-frequency (RF) local oscillator (MHz) | Intermediate frequency (MHz) |
| The B1 of BD2 first phase | 1561.098 | 1490 | 71.098 |
| The B2 of BD2 first phase | 1207.14 | 1120 | 87.14 |
| The B1 of BD2 second phase | 1575.42 | 1490 | 85.42 |
| The B2 of BD2 second phase | 1191.795 | 1120 | 31.795 |
As seen, frequency synthesizer is 1490MHz to the local frequency that the low-converter of treatments B 1 frequency range radiofrequency signal provides, and frequency synthesizer is 1120MHz to the local frequency that the low-converter of treatments B 2 frequency range radiofrequency signals provides; The local frequency that frequency synthesizer provides to analog to digital converter is 62MHz.
The utility model is when carrying out the design of frequency synthesizer, and main consideration receives signal and disturbs with the combination frequency that receives local oscillator, the combination frequency interference between local oscillator, low order combination frequency interference calculation method and result such as table 5.
Table 5 low order combination frequency interference calculation method and result
| ? | F1 | 2F1 | 3F1 |
| F2 | F2-F1 | F2-2F1 | F2-3F1 |
| 2F2 | 2F2-F1 | 2F2-2F1 | 2F2-3F1 |
| 3F2 | 3F2-F1 | 3F2-2F1 | 3F2-3F1 |
| ? | 1490 | 2980 | 4470 |
| 1561.098 | 71.098 | -1418.902 | -2908.902 |
| 3122.196 | 1632.196 | 142.196 | -1347.804 |
| 4683.294 | 3193.294 | 1703.294 | 213.294 |
| ? | 1140 | 2280 | 3420 |
| 1207.14 | 67.14 | -1072.86 | -2242.86 |
| 2352.9 | 1212.9 | 72.9 | -1097.1 |
| 3529.35 | 2389.35 | 1249.35 | 109.35 |
| ? | 1490 | 2980 | 4470 |
| 1575.42 | 85.42 | -1464.58 | -2894.58 |
| 3150.84 | 1660.84 | 170.84 | -1319.16 |
| 4726.26 | 3236.26 | 1746.26 | 256.26 |
[0043]?
| ? | 1140 | 2280 | 3420 |
| 1191.795 | 51.795 | -1088.205 | -2228.205 |
| 2383.59 | 1243.59 | 108.59 | -1036.41 |
| 3575.385 | 2435.385 | 1265.385 | 155.385 |
By the calculating of every combination frequency and protection bandwidth, can find out that the frequency planning of said frequencies synthesizer can avoid the aliasing that each combination frequency component is introduced to disturb.
And in the utility model, the bandpass sampling of 4 intermediate-frequency filters need to be avoided the image spectra aliasing, forms self-interference, the computing method of bandpass sampling frequency alias and result such as table 6.
Computing method and the result of table 6 bandpass sampling spectral aliasing
| ? | 224 | 112 | 0 | -112 | -224 |
| 71.098 | 152.902 | 40.098 | 71.098 | 143.098 | 215.098 |
| 57.14 | 166.86 | 56.86 | 57.14 | 159.14 | 261.14 |
| 85.42 | 138.58 | 26.58 | 85.42 | 197.42 | 309.42 |
| 41.795 | 182.205 | 70.205 | 41.795 | 153.795 | 265.795 |
As can be seen from the above table, the second stage of B1 frequency of BD2 first phase B1 frequency and BD2 is respectively 40.098MHz and the 56.86MHz bandwidth is 4.092MHz, there is not the phenomenon of spectral aliasing in this band, in like manner, BD2 first phase B2 frequency and BD2 second phase B2 frequency are respectively 26.58MHz and 70.205MHz, and bandwidth is the phenomenon that there is not spectral aliasing in 51.15MHz.
3. index is distributed
Radio-frequency module also should keep good linear working state when completing down coversion, filtering, enlarging function.At first need to calculate the required gain of radio-frequency module, because satellite-signal is submerged in noise fully, so only consider noise level when gain is calculated.Its gain distributes as shown in Table 7 and 8.
Table 7 first phase B1 and the gain of the second stage of B1 radio-frequency module are calculated
| The noise power spectral density KT of antenna input | -174dBm/Hz |
| The antenna low elevation gain | -3dBi |
| The LNA gain | 35dB |
| System noise factor | 1.3dB |
| Channel bandwidth | 5MHz |
| Noise power in the radio-frequency module carry input terminal | -73.7dBm |
| Radio-frequency module output terminal in-band noise power | -2dBm |
| The AGC scope | 30dB |
| The radio-frequency module gain | 74.7dB(variation range ± 15dB) |
Table 8 first phase B2 and the gain of the second stage of B2 radio-frequency module are calculated
| The noise power spectral density KT of antenna input | -174dBm/Hz |
| The antenna low elevation gain | -3dBi |
[0056]?
| The LNA gain | 35dB |
| System noise factor | 1.3dB |
| Channel bandwidth | 52MHz |
| Noise power in the radio-frequency module carry input terminal | -63.54dBm |
| Radio-frequency module output terminal in-band noise power | -2dBm |
| The AGC scope | 30dB |
| The radio-frequency module gain | 63.54dB(variation range ± 15dB) |
Claims (6)
1. the compatible receiving trap of Big Dipper first phase and Big Dipper second phase radio frequency, mainly be comprised of power module and the antenna that is connected with power module, low noise amplification module, radio-frequency module and baseband signal processing module, it is characterized in that:
Described low noise amplification module comprises anti-interference filter, first order amplifier, power splitter, 2 narrow band filters and 2 second level amplifiers; Antenna is connected on the input end of anti-interference filter, and the output terminal of anti-interference filter is connected with the input end of power splitter through first order amplifier; On 2 output terminals of power splitter, each is connected to 1 narrow band filter and 1 second level amplifier successively;
Described radio-frequency module comprises 2 low-converters, 2 bandpass filter, 2 automatic gain controllers, 2 intermediate frequency shunts, 4 intermediate-frequency filters, frequency synthesizer and analog to digital converters; Each is connected the output terminal of each second level amplifier of above-mentioned low noise amplification module through 1 low-converter, 1 bandpass filter and the input end of an automatic gain controller with 1 intermediate frequency shunt of being connected successively; Respectively be connected to 2 intermediate-frequency filters on 2 output terminals of each intermediate frequency shunt; The output terminal of above-mentioned 4 intermediate-frequency filters all is connected to the input end of analog to digital converter; The output terminal of analog to digital converter is connected with baseband signal processing module; Frequency synthesizer is connection mode number converter and 2 low-converters respectively.
2. the compatible receiving trap of Big Dipper first phase and Big Dipper second phase radio frequency according to claim 1, it is characterized in that: frequency synthesizer adopts the stable 10MHz crystal oscillator of homology as a reference, comprehensively goes out the required various frequencies of radio-frequency module.
3. the compatible receiving trap of Big Dipper first phase according to claim 1 and 2 and Big Dipper second phase radio frequency, it is characterized in that: frequency synthesizer is respectively 1490MHz and 1120MHz to the local frequency that 2 low-converters provide, and the local frequency that provides to analog to digital converter is 62MHz.
4. the compatible receiving trap of Big Dipper first phase and Big Dipper second phase radio frequency according to claim 1, it is characterized in that: antenna is pasted sheet type antenna.
5. the compatible receiving trap of Big Dipper first phase and Big Dipper second phase radio frequency according to claim 1, it is characterized in that: 2 automatic gain controllers all adopt analog control mode.
6. the compatible receiving trap of Big Dipper first phase and Big Dipper second phase radio frequency according to claim 1, it is characterized in that: 4 intermediate-frequency filters are Surface Acoustic Wave Filter.
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| Application Number | Priority Date | Filing Date | Title |
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| CN 201220514801 CN202929213U (en) | 2012-10-09 | 2012-10-09 | Compatible RF (Radio Frequency) receiving device for BD2 first stage and BD2 second stage |
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| CN 201220514801 CN202929213U (en) | 2012-10-09 | 2012-10-09 | Compatible RF (Radio Frequency) receiving device for BD2 first stage and BD2 second stage |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102937715A (en) * | 2012-10-09 | 2013-02-20 | 桂林电子科技大学 | BD1 (Beidou 1) and BD2 radio frequency compatible receiving method and device |
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- 2012-10-09 CN CN 201220514801 patent/CN202929213U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102937715A (en) * | 2012-10-09 | 2013-02-20 | 桂林电子科技大学 | BD1 (Beidou 1) and BD2 radio frequency compatible receiving method and device |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130508 Termination date: 20141009 |
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| EXPY | Termination of patent right or utility model |