CN105306080A - X-band satellite-borne phase-locked receiver - Google Patents
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Abstract
The invention provides an X-band satellite-borne phase-locked receiver. The X-band satellite-borne phase-locked receiver comprises a receiving link front end, a main phase discriminator, a loop filter and a voltage-controlled oscillator and further comprises a loop gain control device, wherein the receiving link front end is used for inputting a received signal, performing down-conversion of the received signal according to a frequency conversion reference signal output by the voltage-controlled oscillator, and outputting an intermediate-frequency signal; the main phase discriminator is used for receiving the intermediate-frequency signal and the frequency conversion reference signal, performing phase discrimination of the intermediate-frequency signal according to the frequency conversion reference signal, and outputting a direct-current voltage signal and an alternating-current difference beat signal to the loop filter; the loop filter is used for removing the alternating-current difference beat signal by filtration and outputting the direct-current voltage signal to the voltage-controlled oscillator; the voltage-controlled oscillator is used for outputting the frequency conversion reference signal under the control of the direct-current voltage signal; and the loop gain control device is used for performing phase discrimination of the phase-shift intermediate-frequency signal according to the frequency conversion reference signal, and controlling the direct-current gain of the loop filter to be increased when phases are same. By means of the X-band satellite-borne phase-locked receiver disclosed by the invention, the problems that the nondeterminacy of the selective static frequency of the X-band phase-locked receiver is relatively high and the scanning time of a ground measurement and control station is relatively long in the existing aerospace vehicle can be solved.
Description
Technical field
The invention belongs to the spaceborne phase-locked reception technique of satellite communication, particularly be the spaceborne phase-locked receive of X UHF band reception link.
Background technology
In earth-orbiting satellite, unified TT&C system answering machine is generally operational in S frequency range, and in the deep space instrumentation system (DSIS) such as the moon, Mars, according to Aerospace Data Systems consultative council suggestion, uplink and downlink signals all uses X frequency range.The all unified TT&C system answering machine of current China all adopts phase-locked receive structure, and carried out the scanning of frequency by ground station, signal carries out catching and following the tracks of by the answering machine in aerospace vehicle.Along with the fast development of space mission, to aerospace vehicle catch and tracking time requires more and more higher, need answering machine when not catching Received signal strength, reduce the frequency fluctuation scope of internal voltage controlled oscillator, corresponding reduction receiver static frequency is uncertain, guarantee that Received signal strength can lock within the scope of less determination, thus reduce ground station's frequency scan time, improve the real-time of communication.
In deep space instrumentation system (DSIS), the range of scanned frequencies of X frequency range phase-locked receive is wider, it is minimizing ground station sweep time simultaneously, require that receiver static frequency uncertain region is less than ± 50kHz, Received signal strength frequency is generally 749/4 with phase-locked receive internal voltage controlled oscillator output frequency ratio, equivalents voltage controlled oscillator output frequency fluctuation range is less than ± 0.3kHz, and accuracy is for being better than ± 5ppm.Aerospace model phase-locked receive needs to adapt to wider temperature range on the other hand, and temperature fluctuation range is greater than 80 DEG C.According to the existing components and parts level of production of China, in the environment that temperature fluctuation is so violent, the fluctuation of voltage controlled oscillator output frequency is much larger than ± 5ppm, and in aerospace applications, X frequency range phase-locked receive static frequency is uncertain generally at ± about 200kHz, has a certain distance from index request.
Summary of the invention
Object to be solved by this invention is to provide the spaceborne phase-locked receive of a kind of X frequency range, to solve longer problem uncertain comparatively large, the ground control station of X frequency range phase-locked receive selectivity static frequency in existing aerospace vehicle sweep time.
For solving the problem, the present invention proposes the spaceborne phase-locked receive of a kind of X frequency range, comprising: receiver front end, main phase discriminator, loop filter and voltage controlled oscillator; Described Received signal strength in order to input Received signal strength, and is carried out down-conversion according to the frequency conversion reference signal that described voltage controlled oscillator exports by described receiver front end, exports intermediate-freuqncy signal; Described main phase discriminator in order to receive described intermediate-freuqncy signal and frequency conversion reference signal, and carries out phase demodulation according to described frequency conversion reference signal to described intermediate-freuqncy signal, output dc voltage signal with exchange Beat Signal to described loop filter; Described loop filter exchanges Beat Signal in order to described in filtering, and exports described d. c. voltage signal to described voltage controlled oscillator; Described voltage controlled oscillator in order to export described frequency conversion reference signal under the control of described d. c. voltage signal; Also comprise loop gain control device, in order to carry out phase demodulation according to the described intermediate-freuqncy signal of described frequency conversion reference signal to phase shift, and the DC current gain controlling described loop filter when phase place is identical increases.
According to one embodiment of present invention, described loop filter comprises: operational amplifier; It is connected with filter part to form filter circuit; It is also connected with gain circuitry, and the closed and disconnection by switch control rule, when described phase place is identical, control switch closes described gain circuitry, otherwise control switch disconnects described gain circuitry.
According to one embodiment of present invention, described loop filter comprises:
Described operational amplifier, between its reverse input end and output, be in series with the first resistance and the first electric capacity, its output connects the input of described voltage controlled oscillator;
Second resistance, first end connects the output of described main phase discriminator, and the second end connects the reverse input end of described operational amplifier;
3rd resistance, first end connects the reverse input end of described operational amplifier, and the second end connects the output of described operational amplifier;
First switch, is connected in parallel on the two ends of described 3rd resistance;
4th resistance, first end connects the input in the same way of described operational amplifier, the second end ground connection;
5th resistance, first end connects the input in the same way of described operational amplifier;
6th resistance, first end connects the second end of described 5th resistance, and its second end connects supply voltage; And
Second switch, is connected in parallel on the two ends of described 5th resistance;
Wherein, described first switch all disconnects when described phase place is identical with second switch, otherwise closed.
According to one embodiment of present invention, described first switch and second switch are made up of double-pole double-throw switch.
According to one embodiment of present invention, described loop gain control device comprises:
Phase shifter, receives described intermediate-freuqncy signal and carries out phase shift to it, exports phase shift intermediate-freuqncy signal;
Secondary phase discriminator, receives described phase shift intermediate-freuqncy signal and described frequency conversion reference signal, carries out phase demodulation according to described frequency conversion reference signal to described phase shift intermediate-freuqncy signal, export a phase demodulation voltage when phase place is identical; And
Locking instruction generator, receives described phase demodulation voltage and corresponding generation one lock indication signal, controls described switch and close described gain circuitry.
According to one embodiment of present invention, also comprise two power splitters, output is divided in order to described intermediate-freuqncy signal to be carried out two tunnel merits, its input connects the output of described receiver front end, its first output connects the first input end of described main phase discriminator, and its second output connects the input of described phase shifter.
According to one embodiment of present invention, also comprise three power splitters, output is divided in order to described frequency conversion reference signal is carried out three tunnel merits, its input connects the output of described voltage controlled oscillator, its first output connects the second input of described main phase discriminator, its second output connects the second input of described receiver front end, and its 3rd output connects an input of described secondary phase discriminator.
According to one embodiment of present invention, the frequency range of described intermediate-freuqncy signal is 9MHz ~ 11MHz.
After adopting technique scheme, the present invention has following beneficial effect compared to existing technology: phase-locked receive is operated in X frequency range, complete the locking of Received signal strength, and can convert according to the loop gain of lock condition to phase-locked receive, according to described frequency conversion reference signal, phase demodulation is carried out to the intermediate-freuqncy signal of phase shift, and the DC current gain controlling loop filter when phase place identical (Received signal strength locking) increases, otherwise the DC current gain of (Received signal strength non-locking) control loop filter reduces, so, when Received signal strength non-locking, loop gain is little, the direct-current control voltage excursion of voltage controlled oscillator is very little, it is uncertain that phase-locked receive can have extremely low static frequency, when Received signal strength locks, loop gain is high, and phase-locked receive can have normal performance index, and compared with the phase-locked receive of routine, receiver static frequency uncertainty is lower, is conducive to fast Acquisition and the tracking of signal.
Accompanying drawing explanation
Fig. 1 is the structured flowchart of the spaceborne phase-locked receive of X frequency range of one embodiment of the invention;
Fig. 2 is the structural representation of the loop filter of one embodiment of the invention.
Embodiment
For enabling above-mentioned purpose of the present invention, feature and advantage become apparent more, are described in detail the specific embodiment of the present invention below in conjunction with accompanying drawing.
Set forth a lot of detail in the following description so that fully understand the present invention.But the present invention can be much different from alternate manner described here to implement, those skilled in the art can when without prejudice to doing similar popularization when intension of the present invention, therefore the present invention is by the restriction of following public concrete enforcement.
The spaceborne phase-locked receive of X frequency range of the present invention can comprise receiver front end N1, main phase discriminator N3, loop filter N4 and voltage controlled oscillator N6.The locking that this phase-locked receive can complete Received signal strength exports, and be operated in X frequency range, have employed twice down-conversion, the locking of Received signal strength is completed at two intermediate frequencies, be appreciated that phase-locked receive can also comprise other parts, to regulate the performance of phase-locked receive, be such as signal amplification, filtering etc., the present invention does not repeat.
Wherein, referring to Fig. 1, receiver front end N1 inputs Received signal strength and frequency conversion reference signal, and Received signal strength is for being used for into line-locked input signal, and frequency conversion reference signal is that voltage controlled oscillator N6 outputs signal, Received signal strength is carried out down-conversion according to frequency conversion reference signal by receiver front end N1, and export intermediate-freuqncy signal, preferably, the frequency range of intermediate-freuqncy signal is 9MHz ~ 11MHz, the concrete structure of receiver front end N1 can be existing receiver front end, does not repeat them here.
Main phase discriminator N3 receiving intermediate frequency signal and frequency conversion reference signal, and according to frequency conversion reference signal, phase demodulation is carried out to intermediate-freuqncy signal, output dc voltage signal with exchange Beat Signal to loop filter N4, d. c. voltage signal, for being outputed signal according to the main phase discriminator N3 voltage obtained that works by intermediate-freuqncy signal and frequency conversion reference signal two input signals, exchanges the phase difference output signal that Beat Signal is intermediate-freuqncy signal and frequency conversion reference signal two input signals.
Loop filter N4 exchanges Beat Signal in order to filtering, and output dc voltage signal is to voltage controlled oscillator N6, and this d. c. voltage signal is the voltage control signal of voltage controlled oscillator N6.
Voltage controlled oscillator N6 is under the control of d. c. voltage signal, and output frequency conversion reference signal, is supplied to receiver front end N1 and main phase discriminator N3, voltage controlled oscillator N6 are such as VCXOs.
Phase-locked receiving system of the present invention also comprises loop gain control device, the frequency conversion reference signal of voltage controlled oscillator N6 is also supplied to loop gain control device, it carries out phase demodulation according to frequency conversion reference signal to the intermediate-freuqncy signal of phase shift, and when frequency conversion reference signal is identical with the phase place of the intermediate-freuqncy signal of phase shift, the DC current gain of control loop filter N4 increases, otherwise the DC current gain of control loop filter N4 is less or without DC current gain, concrete size can be configured according to actual needs.
Loop filter N4 not only realizes the function that loop filtering exports, and also has the switchable function of gain.In one embodiment, loop filter N4 comprises: operational amplifier, operational amplifier is connected with filter part to form filter circuit, operational amplifier is also connected with gain circuitry, and the closed and disconnection by switch control rule, when frequency conversion reference signal is not identical with the phase place of the intermediate-freuqncy signal of phase shift, namely intermediate-freuqncy signal is not locked, loop gain control device control switch N7 turn-off gain circuit, now loop filter N4 DC current gain is very little, loop filter N4 output voltage fluctuation range equals fluctuation range and the input offset voltage of operational amplifier sum of main phase discriminator N3 output dc voltage signal, its value is less than 5mV, voltage controlled oscillator N6 output frequency is very stable, it is uncertain that phase-locked receive has extremely low static frequency, when frequency conversion reference signal is identical with the phase place of the intermediate-freuqncy signal of phase shift, namely intermediate-freuqncy signal is locked in phase-locked receive, loop gain control device control switch N7 closes gain circuitry, and now the DC current gain of loop filter N4 is very large, and phase-locked receive can normally work.
Concrete, referring to Fig. 2, loop filter N4 can comprise: operational amplifier A 1, is in series with the first resistance R3 and the first electric capacity C1 between its reverse input end (backward end) and output, and its output connects the input of voltage controlled oscillator N6; Second resistance R1, first end connects the output of main phase discriminator N3, the reverse input end of the second end concatenation operation amplifier A1; 3rd resistance R2, the reverse input end of first end concatenation operation amplifier A1, the output of the second end concatenation operation amplifier A1; First switch N7-1, is connected in parallel on the two ends of the 3rd resistance R2; 4th resistance R4, the input in the same way of first end concatenation operation amplifier A1, the second end ground connection; 5th resistance R5, the input in the same way of first end concatenation operation amplifier A1; 6th resistance R6, first end connects second end of the 5th resistance R5, and its second end connects supply voltage VCC, such as, be 5V; And second switch N7-2, be connected in parallel on the two ends of the 5th resistance R5; Wherein, the first switch N7-1 all disconnects when frequency conversion reference signal is identical with the phase place of the intermediate-freuqncy signal of phase shift with second switch N7-2, otherwise closed.In the present embodiment, a kind of execution mode of loop filter is only shown, but other forms of loop filter can also be had, such as operational amplifier is the situation of multilevel amplifiers, but loop filter only needs to have the switchable function of gain circuitry, the type of attachment of concrete parts is not as restriction.
Referring to Fig. 1 and Fig. 2, when intermediate-freuqncy signal non-locking, switch N7 closes, namely the first switch N7-1 and second switch N7-2 is all closed, now, the electric current of loop filter N4 is all by the first switch N7-1 and second switch N7-2, and loop DC gain is 0, and loop filter N4 realizes conventional filtering and exports; And when intermediate-freuqncy signal locks in this phase-locked receive, switch N7 all disconnects, loop DC gain is determined according to the ratio of the second resistance R1 and the 3rd resistance R2, can accomplish that gain is larger, and the output voltage of loop filter N4 is controlled by input in the same way, separate with gain circuitry, do not affect output voltage.
In one embodiment, switch N7 is double-point double-throw switch, be respectively the first switch N7-1 and second switch N7-2, wherein the first switch N7-1 is in parallel as the 3rd resistance R2 of DC feedback resistance with operational amplifier, and the 5th resistance R5 of second switch N7-2 and operational amplifier one of input (holding in the same way) divider resistance is in the same way in parallel.
In embodiment more specifically, the resistance of the second resistance R1 is 75k Ω, the resistance of the 3rd resistance R2 is 5.1M Ω, the resistance of the first resistance R3 is 2k Ω, the value of the first electric capacity C1 is 1 μ F, and the resistance of the 4th resistance R4 is 39 Ω, and the resistance of the 5th resistance R5 is 5.1k Ω, the resistance of the 6th resistance R6 is 36 Ω, VCC value is+5V.Operational amplifier A 1 selects model to be the amplifier of TLC4502, and its input offset voltage is less than 0.1mv.Be appreciated that each component value and model are all not restricted to this.
When intermediate-freuqncy signal locks in this phase-locked receive, switch N7 all disconnects, loop DC gain is R2/R1=68, operational amplifier A 1 in the same way input terminal voltage is R4 × 5 × (1+R2/R1)/(R5+R6)=2.62V, the d. c. voltage signal Absorbable organic halogens that loop filter N4 exports is at about 2.62V, and phase-locked receive can normally work.When intermediate-freuqncy signal non-locking, switch N7 closes, now loop DC gain is 0, the d. c. voltage signal that loop filter N4 exports is R4 × 5 × (1+R2/R1)/R6=2.60V, substantially identical with d. c. voltage signal during locking, do not affect the stable of loop, now the fluctuation range of loop filter N4 output dc voltage signal depends on the input offset voltage (being less than 0.1mV) of operational amplifier A 1 and fluctuation range (the being less than 3mV) sum of main phase discriminator N3 output dc voltage, the control voltage of voltage controlled oscillator N4 can not change substantially, its output frequency is very stable, phase-locked receive can realize extremely low static frequency uncertainty.
Continue referring to Fig. 1, loop gain control device specifically can comprise: phase shifter N8, secondary phase discriminator N9 and locking instruction generator N0.Wherein, phase shifter N8 receiving intermediate frequency signal also carries out phase shift to it, exports phase shift intermediate-freuqncy signal; Secondary phase discriminator N9, it receives phase shift intermediate-freuqncy signal and frequency conversion reference signal, and carry out phase demodulation according to frequency conversion reference signal to phase shift intermediate-freuqncy signal, when frequency conversion reference signal is identical with the phase place of the intermediate-freuqncy signal of phase shift, phase demodulation voltage reaches maximum, exports this phase demodulation voltage; Locking instruction generator N10 receives phase demodulation voltage and corresponding generation one lock indication signal, and be such as a high level, control switch N7 closes gain circuitry, increase DC current gain, otherwise locking instruction generator N10 generates low level signal, control switch N7 turn-off gain circuit.
In FIG, phase-locked receive also comprises two power splitter N2, intermediate-freuqncy signal in order to be exported by receiver front end N1 is carried out two tunnel merits and is divided output, intermediate-freuqncy signal is divided into identical two-way, the input of two power splitter N2 connects the output of receiver front end N1, first output connects the first input end of main phase discriminator N3, and its second output connects the input of phase shifter N8.
In FIG, phase-locked receive also comprises three power splitter N5, frequency conversion reference signal in order to be exported by voltage controlled oscillator N6 is carried out three tunnel merits and is divided output, frequency conversion reference signal is divided into three identical tunnels, its input connects the output of voltage controlled oscillator N6, its first output connects second input of main phase discriminator N3, its second output connects second input of receiver front end N1, the first input end input Received signal strength of receiver front end N1, one input of its 3rd output auxiliary connection phase discriminator N9, another input of secondary phase discriminator N9 receives the phase shift intermediate-freuqncy signal of phase shifter N8.
The spaceborne phase-locked receive of X frequency range of the present invention, when Received signal strength locks, its electrical performance indexes can be consistent with the phase-locked receive of routine, by conversion loop DC current gain, effectively can ensure that Received signal strength is when non-locking, the stability of voltage controlled oscillator output frequency, thus the static frequency reducing receiver is uncertain.
Preferably, the spaceborne phase-locked receive of X frequency range of the present invention can all adopt analogue device to realize, inner without programmable digital device, low in energy consumption, anti-radiation performance good, can be applied in all satellite receiver, be particularly suitable for the Doppler scanning such as the moon, mars exploration wider range, application scenario that VCXO frequency multiplication number of times is higher.
Although the present invention with preferred embodiment openly as above; but it is not for limiting claim; any those skilled in the art without departing from the spirit and scope of the present invention; can make possible variation and amendment, the scope that therefore protection scope of the present invention should define with the claims in the present invention is as the criterion.
Claims (8)
1. the spaceborne phase-locked receive of X frequency range, is characterized in that, comprising: receiver front end, main phase discriminator, loop filter and voltage controlled oscillator; Described Received signal strength in order to input Received signal strength, and is carried out down-conversion according to the frequency conversion reference signal that described voltage controlled oscillator exports by described receiver front end, exports intermediate-freuqncy signal; Described main phase discriminator in order to receive described intermediate-freuqncy signal and frequency conversion reference signal, and carries out phase demodulation according to described frequency conversion reference signal to described intermediate-freuqncy signal, output dc voltage signal with exchange Beat Signal to described loop filter; Described loop filter exchanges Beat Signal in order to described in filtering, and exports described d. c. voltage signal to described voltage controlled oscillator; Described voltage controlled oscillator in order to export described frequency conversion reference signal under the control of described d. c. voltage signal; Also comprise loop gain control device, in order to carry out phase demodulation according to the described intermediate-freuqncy signal of described frequency conversion reference signal to phase shift, and the DC current gain controlling described loop filter when phase place is identical increases.
2. the spaceborne phase-locked receive of X frequency range as claimed in claim 1, it is characterized in that, described loop filter comprises: operational amplifier; It is connected with filter part to form filter circuit; It is also connected with gain circuitry, and the closed and disconnection by switch control rule, when described phase place is identical, control switch closes described gain circuitry, otherwise control switch disconnects described gain circuitry.
3. the spaceborne phase-locked receive of X frequency range as claimed in claim 2, it is characterized in that, described loop filter comprises:
Described operational amplifier, between its reverse input end and output, be in series with the first resistance and the first electric capacity, its output connects the input of described voltage controlled oscillator;
Second resistance, first end connects the output of described main phase discriminator, and the second end connects the reverse input end of described operational amplifier;
3rd resistance, first end connects the reverse input end of described operational amplifier, and the second end connects the output of described operational amplifier;
First switch, is connected in parallel on the two ends of described 3rd resistance;
4th resistance, first end connects the in-phase input end of described operational amplifier, the second end ground connection;
5th resistance, first end connects the in-phase input end of described operational amplifier;
6th resistance, first end connects the second end of described 5th resistance, and its second end connects supply voltage; And
Second switch, is connected in parallel on the two ends of described 5th resistance;
Wherein, described first switch all disconnects when described phase place is identical with second switch, otherwise closed.
4. the spaceborne phase-locked receive of X frequency range as claimed in claim 3, it is characterized in that, described first switch and second switch are made up of double-pole double-throw switch.
5. the spaceborne phase-locked receive of X frequency range as claimed in claim 2, it is characterized in that, described loop gain control device comprises:
Phase shifter, receives described intermediate-freuqncy signal and carries out phase shift to it, exports phase shift intermediate-freuqncy signal;
Secondary phase discriminator, receives described phase shift intermediate-freuqncy signal and described frequency conversion reference signal, carries out phase demodulation according to described frequency conversion reference signal to described phase shift intermediate-freuqncy signal, export a phase demodulation voltage when phase place is identical; And
Locking instruction generator, receives described phase demodulation voltage and corresponding generation one lock indication signal, controls described switch and close described gain circuitry.
6. the spaceborne phase-locked receive of X frequency range as claimed in claim 5, it is characterized in that, also comprise two power splitters, output is divided in order to described intermediate-freuqncy signal to be carried out two tunnel merits, its input connects the output of described receiver front end, its first output connects the first input end of described main phase discriminator, and its second output connects the input of described phase shifter.
7. the spaceborne phase-locked receive of X frequency range as claimed in claim 5, it is characterized in that, also comprise three power splitters, output is divided in order to described frequency conversion reference signal is carried out three tunnel merits, its input connects the output of described voltage controlled oscillator, its first output connects the second input of described main phase discriminator, and its second output connects the second input of described receiver front end, and its 3rd output connects an input of described secondary phase discriminator.
8. the spaceborne phase-locked receive of X frequency range as claimed in claim 1, it is characterized in that, the frequency range of described intermediate-freuqncy signal is 9MHz ~ 11MHz.
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| 佘世刚等: "《用于接收脉冲射频调相信号的锁相接收机》", 《兰州大学学报（自然科学版）》 * |
| 陈翔,陈瑞龙: "《星载统一测控载波跟踪环相位噪声分析》", 《电讯技术》 * |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106921406A (en) * | 2017-04-06 | 2017-07-04 | 上海航天测控通信研究所 | A kind of twin crystal shakes and switches TT＆C Transponder and its changing method |
| CN106921406B (en) * | 2017-04-06 | 2019-05-14 | 上海航天测控通信研究所 | A kind of twin crystal vibration switching TT&C Transponder and its switching method |
| CN110233638A (en) * | 2019-06-24 | 2019-09-13 | 上海航天测控通信研究所 | A kind of VHF frequency range landing search Radio Beacon |
| CN110233638B (en) * | 2019-06-24 | 2021-10-08 | 上海航天测控通信研究所 | Very High Frequency (VHF) frequency band landing searching beacon machine |
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| Publication number | Publication date |
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