CN204721385U - Remote measurement FM/DPSK secondary modulation device - Google Patents
Remote measurement FM/DPSK secondary modulation device Download PDFInfo
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- CN204721385U CN204721385U CN201520450861.XU CN201520450861U CN204721385U CN 204721385 U CN204721385 U CN 204721385U CN 201520450861 U CN201520450861 U CN 201520450861U CN 204721385 U CN204721385 U CN 204721385U
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Abstract
Remote measurement FM/DPSK secondary modulation device, comprise DPSK modulating system, DPLL digital phase-locked loop, derived reference signal, band pass filter and frequency mixer, described DPSK modulating system comprises differential encoder, phase shifter, phasing switch and frequency synthesizer, described digital phase-locked loop comprises phase discriminator, loop filter and voltage controlled oscillator, an output of differential encoder is connected with an input of phasing switch, an output of frequency synthesizer is connected with an input of phasing switch, another output of frequency synthesizer is connected with the input of phasing switch by phase shifter, the output of phasing switch is connected with the input of voltage controlled oscillator, an output of voltage controlled oscillator is connected with the input of frequency mixer by band pass filter, another output of voltage controlled oscillator passes through phase discriminator, loop filter is connected with another input of voltage controlled oscillator.The utility model rate-adaptive pacemaker stability is high, and the availability of frequency spectrum is high, and structure is simple, implements and easy to maintenance.
Description
Technical field
The utility model relates to telemetry field, particularly a kind of remote measurement FM/DPSK secondary modulation device.
Background technology
In telemetry communication field, the main task of telemetering transmiter passes through antenna transmission after being carried out by actual signal encoding, modulate and amplify.At present, telemetering transmiter mainly adopts the mode of simulation Low Medium Frequency modulation, after effective base band data or telemetry are carried out chnnel coding process, be modulated at again on analog intermediate frequency, through the intermediate frequency process such as intermediate frequency filtering, amplification link, and then by after the link process such as up-conversion, radio-frequency power amplification and rf filtering, signal is delivered to transmitting antenna.But in telemetry communication receiver, due to the existence of Doppler effect, the frequency band of telemetered signal own is narrower, the Doppler frequency of signal, already beyond signal bandwidth scope, cannot carry out trace demodulation.Adopt this single modulation system, bring great difficulty can to the reception of signal.
In current remote measurement modulation communication, also part is had to adopt secondary modulation mode, this modulation system adopts PCM/FM modulation system, but because the LF-response characteristic of system is undesirable, debug difficulties, system underaction, and the availability of frequency spectrum is low, along with the continuous increase of telemetry, this modulation system cannot meet the demand of remote measurement.
Utility model content
Based on this, for the problems referred to above, be necessary to propose a kind of FM/DPSK secondary modulation device, this device adopts analog fm and differential phase keying (DPSK) to combine, and make rate-adaptive pacemaker stability high, the availability of frequency spectrum is high, frequency deviation is wide, and modulating device overall structure is simple, the module of use is few, implements and easy to maintenance.
The technical solution of the utility model is: remote measurement FM/DPSK secondary modulation device, comprise DPSK modulating system, DPLL digital phase-locked loop, derived reference signal, band pass filter and frequency mixer, described DPSK modulating system comprises differential encoder, phase shifter, phasing switch and frequency synthesizer, described digital phase-locked loop comprises phase discriminator, loop filter and voltage controlled oscillator, the output of differential encoder is connected with the input of phasing switch, an output of frequency synthesizer is connected with an input of phasing switch, another output of frequency synthesizer is connected with another input of phasing switch by phase shifter, the output of phasing switch is connected with the input of voltage controlled oscillator, an output of voltage controlled oscillator is connected with the input of frequency mixer by band pass filter, another output of voltage controlled oscillator passes through phase discriminator, loop filter is connected with another input of voltage controlled oscillator.
Wherein, DPSK modulation of the present utility model mainly adopts keying, be specially: baseband signal is obtained relocatable code after differential coding, the cosine signal of frequency synthesizer synthesis and the cosine signal after 180 ° of phase shifts are entered phasing switch with the relocatable code obtained simultaneously and carries out phase modulation, obtain DPSK modulation signal.
FM modulation of the present utility model, digital phase-locked loop is mainly utilized to carry out frequency modulation, the voltage that digital phase-locked loop is directly proportional by the phase difference taking out input reference signal frequency and modulated dpsk signal, this voltage is controlled frequency of oscillation as the control voltage of voltage controlled oscillator, making the frequency of output signal equal with the frequency of input signal, is namely that the DPSK modulation signal of input is carried out FM modulation.
Further, this modulating device also comprises local oscillation circuit, and local oscillation circuit output is connected with the input of frequency mixer.Export after the input frequency signal that frequency mixer utilizes local oscillation circuit to provide and FM/DPSK Multi-modulation signal carry out up-conversion.
The beneficial effects of the utility model are:
(1) this modulating device adopts FM modulation and DPSK to modulate the mode combined, and the availability of frequency spectrum is high, and output frequency has high stability, and frequency deviation is wider;
(2) this modulating device module used is few, and structure is simple, implements and easy to maintenance, is applicable to the needs of following telemetry.
Accompanying drawing explanation
Fig. 1 is structural schematic block diagram of the present utility model;
Fig. 2 is the differential coding circuit in the utility model embodiment;
Fig. 3 is the phase-locked loop FM circuit in the utility model embodiment;
In figure, 01-frequency synthesizer, 02-differential encoder, 03-loop filter, 04-phase discriminator, 05-derived reference signal, 06-local oscillation circuit, 07-phase shifter, 08-phasing switch, 09-voltage controlled oscillator, 10-band pass filter, 11-frequency mixer.
Embodiment
Be described in detail to embodiment of the present utility model below in conjunction with accompanying drawing, execution mode of the present utility model includes but not limited to the following example.
Embodiment:
As shown in Figure 1, remote measurement FM/DPSK secondary modulation device, comprise DPSK modulating system, DPLL digital phase-locked loop, derived reference signal 05, band pass filter 10 and frequency mixer 11, described DPSK modulating system comprises differential encoder 02, phase shifter 07, phasing switch 08 and frequency synthesizer 01, described digital phase-locked loop comprises phase discriminator 04, loop filter 03 and voltage controlled oscillator 09, the output of differential encoder 02 is connected with the input of phasing switch 08, an output of frequency synthesizer 01 is connected with an input of phasing switch 08, another output of frequency synthesizer 01 is connected with another input of phasing switch 08 by phase shifter 07, the output of phasing switch 08 is connected with the input of voltage controlled oscillator 09, an output of voltage controlled oscillator 09 is connected with the input of frequency mixer 11 by band pass filter 10, another output of voltage controlled oscillator 09 is by phase discriminator 04, loop filter 03 is connected with another input of voltage controlled oscillator 09.The output of derived reference signal 05 is connected with the input of phase discriminator 04.
Preferably, this modulating device also comprises local oscillation circuit 06, and the output of local oscillation circuit 06 is connected with the input of frequency mixer 11.
Further, overall work principle of the present utility model is as follows:
In this remote measurement FM/DPSK secondary modulation device, input signal obtains relocatable code after differential coding, frequency synthesizer 01 produces cosine signal, the cosine signal produced is passed through phase shifter 07 by cosine signal 180 ° of phase shifts, then the cosine signal after cosine signal relocatable code and frequency synthesizer 01 synthesized and phase shift enters phasing switch 08 pair of subcarrier simultaneously and carries out phase modulation, obtains DPSK modulation signal.
Then digital phase-locked loop is by taking out the phase difference of carrier wave and modulated dpsk signal, obtain the voltage be directly proportional, this voltage is controlled frequency of oscillation as the control voltage of voltage controlled oscillator 09, reach the object that the frequency of output signal is equal with frequency input signal, realize the FM frequency modulation to DPSK modulation signal.Finally the dpsk signal by FM frequency modulation is amplified to suitable power, exports after up-conversion to carrier frequency, complete this FM/DPSK secondary modulation.
Wherein, the effect of frequency synthesizer 01 produces cosine carrier, differential encoder 02 is for carrying out differential coding by baseband signal, thus obtain relocatable code, the effect of phase shifter 07 is by cosine signal 180 ° of phase shifts, the effect of phasing switch 08 connects phase place 0 when being input as digital information " 0 ", be meet phase place π, thus phase modulation exports DPSK modulation signal when input digital information is " 1 ".Dpsk signal after modulation enters DPLL digital phase-locked loop, and the output frequency of voltage controlled oscillator 09 is changed with the change of modulation signal, thus produces frequency-modulated wave.In DPLL digital phase-locked loop, the phase error voltage produced when the effect of loop filter 03 is and ensures voltage controlled oscillator 09 centre frequency and Carrier frequency lock passes through.The voltage export loop filter 03 and modulation signal enter voltage controlled oscillator 09 jointly, in order to control the frequency of voltage controlled oscillator 09, to obtain the frequency-modulated wave with carrier frequency with same frequency stability.
Further, be illustrated in figure 2 differential coding circuit 02, differential coding is the key of carrying out the modulation of DPSK keying, and the absolute code of input, from the input of IO1 mouth, is converted to relocatable code by integrated circuit 74HC76D, and exports from IO3 mouth by input signal.Relocatable code after conversion is used for carrier wave phase modulation, realizes modulating the DPSK of input signal.
Further, be illustrated in figure 3 phase-locked loop FM circuit, this circuit adopts CD4046 chip, and CD4046 is the phase-locked loop of band voltage controlled oscillator 09, is high-speed silicon canopy cmos device.This circuit comprises a linear voltage controlled oscillator (VCO) and two common signal input amplifiers, and public comparator (PC1, PC2), input signal can with large voltage signal direct-coupling, automatic biasing input circuit makes small voltage signal remain in the range of linearity of input amplifier, use a passive loop filter to make CD4046 chip form a second-order PLL, make the stability that the output of whole channel frequency reaches high.
The above embodiment only have expressed embodiment of the present utility model, and it describes comparatively concrete and detailed, but therefore can not be interpreted as the restriction to the utility model the scope of the claims.It should be pointed out that for the person of ordinary skill of the art, without departing from the concept of the premise utility, can also make some distortion and improvement, these all belong to protection range of the present utility model.
Claims (2)
1. remote measurement FM/DPSK secondary modulation device, it is characterized in that, comprise DPSK modulating system, DPLL digital phase-locked loop, derived reference signal, band pass filter and frequency mixer, described DPSK modulating system comprises differential encoder, phase shifter, phasing switch and frequency synthesizer, described digital phase-locked loop comprises phase discriminator, loop filter and voltage controlled oscillator, the output of differential encoder is connected with the input of phasing switch, an output of frequency synthesizer is connected with an input of phasing switch, another output of frequency synthesizer is connected with another input of phasing switch by phase shifter, the output of phasing switch is connected with the input of voltage controlled oscillator, an output of voltage controlled oscillator is connected with the input of frequency mixer by band pass filter, another output of voltage controlled oscillator passes through phase discriminator, loop filter is connected with another input of voltage controlled oscillator.
2. remote measurement FM/DPSK secondary modulation device according to claim 1, it is characterized in that, this modulating device also comprises local oscillation circuit, and the output of local oscillation circuit is connected with the input of frequency mixer.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201520450861.XU CN204721385U (en) | 2015-06-26 | 2015-06-26 | Remote measurement FM/DPSK secondary modulation device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201520450861.XU CN204721385U (en) | 2015-06-26 | 2015-06-26 | Remote measurement FM/DPSK secondary modulation device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106789787A (en) * | 2016-12-14 | 2017-05-31 | 南京理工大学 | A kind of PCM/DPSK/FM modulation /demodulation module and method |
| CN112737710A (en) * | 2020-12-24 | 2021-04-30 | 重庆航天火箭电子技术有限公司 | PCM-DPSK-FM safety control receiver index testing method |
-
2015
- 2015-06-26 CN CN201520450861.XU patent/CN204721385U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106789787A (en) * | 2016-12-14 | 2017-05-31 | 南京理工大学 | A kind of PCM/DPSK/FM modulation /demodulation module and method |
| CN106789787B (en) * | 2016-12-14 | 2019-08-30 | 南京理工大学 | A PCM/DPSK/FM modulation and demodulation module and method |
| CN112737710A (en) * | 2020-12-24 | 2021-04-30 | 重庆航天火箭电子技术有限公司 | PCM-DPSK-FM safety control receiver index testing method |
| CN112737710B (en) * | 2020-12-24 | 2023-02-17 | 重庆航天火箭电子技术有限公司 | PCM-DPSK-FM safety control receiver index testing method |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CB03 | Change of inventor or designer information |
Inventor after: Wu Wei Inventor after: Yang Huiying Inventor after: Wu Fan Inventor before: Wu Wei |
|
| COR | Change of bibliographic data | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20151021 Termination date: 20160626 |