CN203950040U - A kind of fast Acquisition structure of spaceborne spread spectrum answering machine pseudo-code - Google Patents
A kind of fast Acquisition structure of spaceborne spread spectrum answering machine pseudo-code Download PDFInfo
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Abstract
A kind of fast Acquisition structure of spaceborne spread spectrum answering machine pseudo-code, low noise amplifier, a low-converter, local oscillator frequency multiplier, compensation crystal oscillator, a crystal oscillator amplify shunt, intermediate frequency amplifier, AGC detector amplefier, secondary mixing device, secondary intermediate frequency amplifier, secondary local oscillator frequency multiplier, if sampling module, clock generation control module, single-frequency interference detection module, carrier wave demodulation module, acquisition control module, acquiring pseudo code module, threshold judgement module; Single-frequency interference detection module comprises again signal transform domain modular converter, Interference Detection cancellation module, time domain modular converter.The utility model can complete the inhibition that input signal single-frequency is disturbed at the front end of signal capture; In the time of acquiring pseudo code, the switching of detection threshold is dynamically combined with pseudo-code positive sequence, backward, make unit can bear larger Doppler shift scope and have acquisition speed faster.
Description
Technical field
The utility model relates to a kind of fast Acquisition structure of spaceborne spread spectrum answering machine pseudo-code, belongs to spaceborne measurement and control area.
Background technology
At Aerospace Tracking & Control, spread spectrum answering machine is the unique carrier that connects satellite and ground, and spaceborne spread spectrum answering machine is the complicated on-board equipment that integrated receiving cable, digital processing, transmission channel are integrated.The various functions such as it has that pseudo-random code ranging, carrier doppler test the speed concurrently, processing data information and transmission, are the carriers of realizing the ground integrated observing and controlling of star, in star ground observing and controlling, occupy irreplaceable effect.
Along with the development of space observation and control technology, aspect the fast Acquisition of existing spaceborne spread spectrum answering machine pseudo-code in the time tackling some strong jammings of space, new requirement is proposed.The functional module of the utility model integrated single-frequency Interference Detection and elimination in existing spaceborne spread spectrum answering machine acquisition equipment, increases the ability that unit opposing arrowband disturbs.In addition, in this application, the switching of detection threshold is combined with pseudo-code positive sequence, backward Dynamical capture, larger Doppler shift tolerance and acquisition speed are faster provided, and compared with traditional acquisition equipment, acquisition speed can improve 2 or the higher order of magnitude.
Utility model content
Technology of the present utility model is dealt with problems and is: for the deficiencies in the prior art, a kind of fast Acquisition structure of spaceborne spread spectrum answering machine pseudo-code is provided, solve the spaceborne spread spectrum answering machine problem that acquisition probability reduces in the time that the large dynamically lower single-frequency interference of carrier doppler exists, in acquisition procedure, increase single-frequency Interference Detection filtering module elimination single-frequency and disturb the impact bringing, increase acquisition control module local pseudo-code is carried out to dynamic mobile control, realized the fast Acquisition of spaceborne spread spectrum answering machine pseudo-code in complex environment.
Technical solution of the present utility model is:
The fast Acquisition structure of spaceborne spread spectrum answering machine pseudo-code comprises: low noise amplifier, a low-converter, local oscillator frequency multiplier, compensation crystal oscillator, a crystal oscillator amplify shunt, intermediate frequency amplifier, AGC detector amplefier, secondary mixing device, secondary intermediate frequency amplifier, secondary local oscillator frequency multiplier, if sampling module, clock generation control module, single-frequency interference detection module, a carrier wave demodulation module, acquisition control module, acquiring pseudo code module, threshold judgement module; Single-frequency interference detection module comprises again signal transform domain modular converter, Interference Detection cancellation module, time domain modular converter;
Receive the radiofrequency signal of outside input for the input end of the low noise amplifier that amplifies of radiofrequency signal to input, output terminal connects a low-converter for input radio frequency signal and local oscillator being carried out to down coversion;
No. one time low-converter has two input ports, and one of them input end connects low noise amplifier, and another input end connects the output terminal of a local oscillator frequency multiplier, and the output terminal of a low-converter connects the input end of intermediate frequency amplifier;
One time local oscillator frequency multiplier has two input ports, and an input port connects the local oscillation signal that receives local oscillator output, and another one input port connects the output terminal of crystal amplification shunt; There are two output terminals for the signal after a down coversion being amplified with the intermediate frequency amplifier of filtering, one of them input end connects the output terminal of a low-converter, another one input end connects the output terminal of AGC detector amplefier, the input end of the output terminal connecting secondary frequency mixer of intermediate frequency amplifier, the output level of intermediate frequency amplifier is controlled according to the damping capacity of AGC Control of Voltage electric bridge;
Secondary mixing device has two input ends, and one of them input end connects the output terminal of intermediate frequency amplifier, the input end of another input end connecting secondary local oscillator frequency multiplier, the input end of the output terminal connecting secondary intermediate frequency amplifier of secondary mixing device;
Secondary intermediate frequency amplifier has two input ends and output terminal, the input end of one of them input end connecting secondary frequency mixer, another one input end connects the output terminal of AGC detector amplefier, one of them output terminal of secondary intermediate frequency amplifier connects the input end of AGC detector amplefier, and another one output terminal connects if sampling module and is used for exporting down coversion;
Secondary local oscillator frequency multiplier has two input ends, and one of them input end connects the output terminal that receives local oscillator for amplifying the local oscillation signal that receives local oscillator output, and another one input end connects crystal and amplifies shunt; Secondary local oscillator frequency multiplier output terminal connecting secondary frequency mixer is used to secondary mixing device that secondary down coversion local oscillation signal is provided;
The output terminal of compensation crystal oscillator connects the input end of crystal oscillator amplifier, the output terminal of crystal amplifier connects crystal oscillator and amplifies the input end of shunt, connects respectively the input end of local oscillator frequency multiplier, secondary local oscillator frequency multiplier, clock generation control module for the crystal of different frequency output being amplified to two output terminals of shunt;
There are two input ends for the if sampling module of carrying out if signal sampling, the output terminal of one of them input end connecting secondary intermediate frequency amplifier, another one input end connects the output terminal of clock generation control module for receive clock sampling control signal; The output terminal of if sampling module connects the input end of single-frequency interference detection module;
The output terminal of single-frequency interference detection module connects the input end of carrier wave demodulation module; Be used for if sampling signal to carry out the input end of the output terminal connection acquiring pseudo code module of the carrier wave demodulation module of demodulation;
Acquiring pseudo code module has three input ends, and one of them input end connects carrier wave demodulation module, and another input end connects the output terminal of acquisition control module, and the output terminal of the 3rd input end connection clock generation control module is for receive clock signal; Acquiring pseudo code module has two output terminals, and one of them output terminal connects the input end of thresholding judging module, and another one output terminal connects acquisition control module;
The output terminal of threshold judgement module connects the input end of acquisition control module;
Acquisition control module has two input ends, and one of them input end connects the output terminal of thresholding judging module, and another one input end connects the output terminal of acquiring pseudo code module;
The input end of the transform domain modular converter in single-frequency interference detection module connects the output terminal of if sampling module; The output terminal of transform domain modular converter connects the input end of Interference Detection cancellation module;
The output terminal of Interference Detection cancellation module connects the input end of time domain modular converter;
The output terminal of time domain modular converter connects the input end of carrier wave demodulation module;
Described compensation crystal oscillator adopts overtone crystal oscillator; Crystal amplifies shunt and adopts broadband integrated amplifier.
Described low noise amplifier adopts low-noise tube; A described low-converter and secondary mixing device employing microwave integrated circuit respectively; Described intermediate frequency amplifier adopts hydrid integrated circuit to realize; Described reception local oscillator, local oscillator frequency multiplier, a secondary local oscillator frequency multiplier all adopt phase-locking frequency multiplication circuit.
Described if sampling module adopts modulus conversion chip AD10200; Described clock generation control module adopts programmable clock generator; Described carrier wave demodulation module, acquisition control module and acquiring pseudo code module adopt XC2V1000; Described threshold judgement module adopts digital comparator; Described signal transform domain modular converter, Interference Detection cancellation module, time domain modular converter adopt TMS320C6416 chip.
The utility model beneficial effect is compared with prior art:
(1) the utility model has increased the acquisition probability of spaceborne spread spectrum answering machine in the time that the large dynamically lower single-frequency interference of carrier doppler exists, and in acquisition procedure, increase single-frequency interference detection module, can detect in real time also filtering disturbs from the single-frequency of spaceborne answering machine outside, increased the accuracy of catching, reliability is higher.
(2) the utility model has increased acquisition control module local pseudo-code has been carried out to dynamic mobile control, has realized, and can under complex environment, carry out the fast Acquisition of spaceborne spread spectrum answering machine pseudo-code, and catching speed increases.
Brief description of the drawings
Fig. 1 the utility model structural representation;
Fig. 2 the utility model single-frequency interference filtering module;
Fig. 3 the utility model acquiring pseudo code control flow chart.
Embodiment
Below in conjunction with accompanying drawing, embodiment of the present utility model is further described in detail.
As shown in Figure 1, 2, the fast Acquisition structure of spaceborne spread spectrum answering machine pseudo-code comprises: low noise amplifier, low-converter, local oscillator frequency multiplier, compensation crystal oscillator, a crystal oscillator amplify shunt, intermediate frequency amplifier, AGC detector amplefier, secondary mixing device, secondary intermediate frequency amplifier,, secondary local oscillator frequency multiplier, if sampling module, clock generation control module, single-frequency interference detection module, a carrier wave demodulation module, acquisition control module, acquiring pseudo code module, threshold judgement module; Single-frequency interference detection module comprises again signal transform domain modular converter, Interference Detection cancellation module, time domain modular converter;
Receive the radiofrequency signal of outside input for the input end of the low noise amplifier that amplifies of radiofrequency signal to input, output terminal connects a low-converter for input radio frequency signal and local oscillator being carried out to down coversion;
No. one time low-converter has two input ports, and one of them input end connects low noise amplifier, and another input end connects the output terminal of a local oscillator frequency multiplier, and the output terminal of a low-converter connects the input end of intermediate frequency amplifier;
One time local oscillator frequency multiplier has two input ports, and an input port connects the local oscillation signal that receives local oscillator output, and another one input port connects the output terminal of crystal amplification shunt;
There are two output terminals for the signal after a down coversion being amplified with the intermediate frequency amplifier of filtering, one of them input end connects the output terminal of a low-converter, another one input end connects the output terminal of AGC detector amplefier, the input end of the output terminal connecting secondary frequency mixer of intermediate frequency amplifier, the output level of intermediate frequency amplifier is controlled according to the damping capacity of AGC Control of Voltage electric bridge;
Secondary mixing device has two input ends, and one of them input end connects the output terminal of intermediate frequency amplifier, the input end of another input end connecting secondary local oscillator frequency multiplier, the input end of the output terminal connecting secondary intermediate frequency amplifier of secondary mixing device;
Secondary intermediate frequency amplifier has two input ends and output terminal, the input end of one of them input end connecting secondary frequency mixer, another one input end connects the output terminal of AGC detector amplefier, one of them output terminal of secondary intermediate frequency amplifier connects the input end of AGC detector amplefier, and another one output terminal connects if sampling module and is used for exporting down coversion;
Secondary local oscillator frequency multiplier has two input ends, and one of them input end connects the output terminal that receives local oscillator for amplifying the local oscillation signal that receives local oscillator output, and another one input end connects crystal and amplifies shunt; Secondary local oscillator frequency multiplier output terminal connecting secondary frequency mixer is used to secondary mixing device that secondary down coversion local oscillation signal is provided;
The output terminal of compensation crystal oscillator connects the input end of crystal oscillator amplifier, the output terminal of crystal amplifier connects crystal oscillator and amplifies the input end of shunt, connects respectively the input end of local oscillator frequency multiplier, secondary local oscillator frequency multiplier, clock generation control module for the crystal of different frequency output being amplified to two output terminals of shunt;
There are two input ends for the if sampling module of carrying out if signal sampling, the output terminal of one of them input end connecting secondary intermediate frequency amplifier, another one input end connects the output terminal of clock generation control module for receive clock sampling control signal; The output terminal of if sampling module connects the input end of single-frequency interference detection module;
The output terminal of single-frequency interference detection module connects the input end of carrier wave demodulation module; Be used for if sampling signal to carry out the input end (carrier wave demodulation module makes if sampling signal and the local carrier of input carry out mixing by multiplier, realizes the demodulation to intermediate-freuqncy signal) of the output terminal connection acquiring pseudo code module of the carrier wave demodulation module of demodulation;
Acquiring pseudo code module has three input ends, and one of them input end connects carrier wave demodulation module, and another input end connects the output terminal of acquisition control module, and the output terminal of the 3rd input end connection clock generation control module is for receive clock signal; Acquiring pseudo code module has two output terminals, one of them output terminal connects the input end (acquiring pseudo code module export the pseudo-code peak value that captures and detection threshold to threshold judgement module) of thresholding judging module, another one output terminal connection acquisition control module;
The output terminal of threshold judgement module connects the input end of acquisition control module;
Acquisition control module has two input ends, (threshold judgement module is by the pseudo-code peak value and the threshold value that receive for the output terminal of one of them input end connection thresholding judging module, and export court verdict to acquisition control module), another one input end connects the output terminal of acquiring pseudo code module (acquisition control module output is caught and enabled, detection threshold control, catch current code phase used to acquiring pseudo code module);
The input end of the transform domain modular converter in single-frequency interference detection module connects the output terminal (transform domain modular converter is for being transformed to frequency-region signal time domain digital intermediate frequency signal frequency domain) of if sampling module; The output terminal of transform domain modular converter connects the input end of Interference Detection cancellation module;
(whether the power to peak signal in interference detection module and the average power of logical inband signaling compare the input end of the output terminal connection time domain modular converter of Interference Detection cancellation module, exist to judge that single-frequency is disturbed.After testing, disturb while existence (1), and interference cancellation module will be counted rear output to disturbing the frequency band existing to put; (2) disturb while existence, interference cancellation module will directly be exported the signal of input);
The output terminal of time domain modular converter connects the input end (time domain that the output signal of interference cancellation module is directly carried out of time domain modular converter is changed rear output) of carrier wave demodulation module;
Compensation crystal oscillator adopts overtone crystal oscillator; Crystal amplifies shunt and adopts broadband integrated amplifier.
Low noise amplifier adopts low-noise tube; A described low-converter and secondary mixing device employing microwave integrated circuit respectively; Intermediate frequency amplifier adopts hydrid integrated circuit to realize; Described reception local oscillator, local oscillator frequency multiplier, a secondary local oscillator frequency multiplier all adopt phase-locking frequency multiplication circuit.
If sampling module adopts modulus conversion chip AD10200; Clock generation control module adopts programmable clock generator; Carrier wave demodulation module, acquisition control module and acquiring pseudo code module adopt XC2V1000; Threshold judgement module adopts digital comparator; Signal transform domain modular converter, Interference Detection cancellation module, time domain modular converter adopt TMS320C6416 chip.
The utility model principle of work is as follows:
While catching for the first time, trapping module detection threshold coefficient is set to height, and local pseudo-code be set start to catch from ' 0 ' phase place, if afterwards when catch at every turn do not have acquisition success will on current acquisition phase, add 0.5 chip phase place after finishing after continuation high threshold catch.When the acquisition success not also after all having traveled through of all pseudo-code phase under high threshold, arrange local pseudo-code from ' N-1 ' (pseudo-code phase length is N) phase place starts catching of a new round, after finishing if catch at every turn, catch unsuccessfully to continue to catch by high threshold deduct 0.5 chip phase place on current acquisition phase after.If backward is caught one of traversal whole pseudo-code week, after date is caught unsuccessfully, falls detection threshold coefficient and is set to low above-mentioned pseudo-code positive sequence, the backward acquisition procedure of repeating, until acquisition success.
The unspecified part of the utility model belongs to general knowledge as well known to those skilled in the art.
Claims (4)
1. the fast Acquisition structure of a spaceborne spread spectrum answering machine pseudo-code, it is characterized in that comprising: low noise amplifier, a low-converter, local oscillator frequency multiplier, compensation crystal oscillator, a crystal oscillator amplify shunt, intermediate frequency amplifier, AGC detector amplefier, secondary mixing device, secondary intermediate frequency amplifier, secondary local oscillator frequency multiplier, if sampling module, clock generation control module, single-frequency interference detection module, carrier wave demodulation module, acquisition control module, acquiring pseudo code module, threshold judgement module; Single-frequency interference detection module comprises again signal transform domain modular converter, Interference Detection cancellation module, time domain modular converter;
Receive the radiofrequency signal of outside input for the input end of the low noise amplifier that amplifies of radiofrequency signal to input, output terminal connects a low-converter for input radio frequency signal and local oscillator being carried out to down coversion;
No. one time low-converter has two input ports, and one of them input end connects low noise amplifier, and another input end connects the output terminal of a local oscillator frequency multiplier, and the output terminal of a low-converter connects the input end of intermediate frequency amplifier;
One time local oscillator frequency multiplier has two input ports, and an input port connects the local oscillation signal that receives local oscillator output, and another one input port connects the output terminal of crystal amplification shunt; There are two output terminals for the signal after a down coversion being amplified with the intermediate frequency amplifier of filtering, one of them input end connects the output terminal of a low-converter, another one input end connects the output terminal of AGC detector amplefier, the input end of the output terminal connecting secondary frequency mixer of intermediate frequency amplifier, the output level of intermediate frequency amplifier is controlled according to the damping capacity of AGC Control of Voltage electric bridge;
Secondary mixing device has two input ends, and one of them input end connects the output terminal of intermediate frequency amplifier, the input end of another input end connecting secondary local oscillator frequency multiplier, the input end of the output terminal connecting secondary intermediate frequency amplifier of secondary mixing device;
Secondary intermediate frequency amplifier has two input ends and output terminal, the input end of one of them input end connecting secondary frequency mixer, another one input end connects the output terminal of AGC detector amplefier, one of them output terminal of secondary intermediate frequency amplifier connects the input end of AGC detector amplefier, and another one output terminal connects if sampling module and is used for exporting down coversion;
Secondary local oscillator frequency multiplier has two input ends, and one of them input end connects the output terminal that receives local oscillator for amplifying the local oscillation signal that receives local oscillator output, and another one input end connects crystal and amplifies shunt; Secondary local oscillator frequency multiplier output terminal connecting secondary frequency mixer is used to secondary mixing device that secondary down coversion local oscillation signal is provided;
The output terminal of compensation crystal oscillator connects the input end of crystal oscillator amplifier, the output terminal of crystal amplifier connects crystal oscillator and amplifies the input end of shunt, connects respectively the input end of local oscillator frequency multiplier, secondary local oscillator frequency multiplier, clock generation control module for the crystal of different frequency output being amplified to two output terminals of shunt;
There are two input ends for the if sampling module of carrying out if signal sampling, the output terminal of one of them input end connecting secondary intermediate frequency amplifier, another one input end connects the output terminal of clock generation control module for receive clock sampling control signal; The output terminal of if sampling module connects the input end of single-frequency interference detection module;
The output terminal of single-frequency interference detection module connects the input end of carrier wave demodulation module; Be used for if sampling signal to carry out the input end of the output terminal connection acquiring pseudo code module of the carrier wave demodulation module of demodulation;
Acquiring pseudo code module has three input ends, and one of them input end connects carrier wave demodulation module, and another input end connects the output terminal of acquisition control module, and the output terminal of the 3rd input end connection clock generation control module is for receive clock signal; Acquiring pseudo code module has two output terminals, and one of them output terminal connects the input end of thresholding judging module, and another one output terminal connects acquisition control module;
The output terminal of threshold judgement module connects the input end of acquisition control module;
Acquisition control module has two input ends, and one of them input end connects the output terminal of thresholding judging module, and another one input end connects the output terminal of acquiring pseudo code module;
The input end of the transform domain modular converter in single-frequency interference detection module connects the output terminal of if sampling module; The output terminal of transform domain modular converter connects the input end of Interference Detection cancellation module;
The output terminal of Interference Detection cancellation module connects the input end of time domain modular converter;
The output terminal of time domain modular converter connects the input end of carrier wave demodulation module.
2. according to the fast Acquisition structure of a kind of spaceborne spread spectrum answering machine pseudo-code shown in claim 1, it is characterized in that: described compensation crystal oscillator adopts overtone crystal oscillator; Crystal amplifies shunt and adopts broadband integrated amplifier.
3. according to the fast Acquisition structure of a kind of spaceborne spread spectrum answering machine pseudo-code shown in claim 1, it is characterized in that: described low noise amplifier adopts low-noise tube; A described low-converter and secondary mixing device employing microwave integrated circuit respectively; Described intermediate frequency amplifier adopts hydrid integrated circuit to realize; Described reception local oscillator, local oscillator frequency multiplier, a secondary local oscillator frequency multiplier all adopt phase-locking frequency multiplication circuit.
4. according to the fast Acquisition structure of a kind of spaceborne spread spectrum answering machine pseudo-code shown in claim 1, it is characterized in that: described if sampling module adopts modulus conversion chip AD10200; Described clock generation control module adopts programmable clock generator; Described carrier wave demodulation module, acquisition control module and acquiring pseudo code module adopt XC2V1000; Described threshold judgement module adopts digital comparator; Described signal transform domain modular converter, Interference Detection cancellation module, time domain modular converter adopt TMS320C6416 chip.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104601187A (en) * | 2015-02-04 | 2015-05-06 | 上海航天测控通信研究所 | Spaceborne automatic gain switching phase-locked receiver |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104601187A (en) * | 2015-02-04 | 2015-05-06 | 上海航天测控通信研究所 | Spaceborne automatic gain switching phase-locked receiver |
| CN104601187B (en) * | 2015-02-04 | 2017-07-04 | 上海航天测控通信研究所 | A kind of phase-locked receive of spaceborne automatic switchover gain |
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