CN103149574A - Method and device for simulating link channel between navigation satellites - Google Patents
Method and device for simulating link channel between navigation satellites Download PDFInfo
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- CN103149574A CN103149574A CN2013100776662A CN201310077666A CN103149574A CN 103149574 A CN103149574 A CN 103149574A CN 2013100776662 A CN2013100776662 A CN 2013100776662A CN 201310077666 A CN201310077666 A CN 201310077666A CN 103149574 A CN103149574 A CN 103149574A
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Abstract
The invention discloses a method for simulating a link channel between navigation satellites, wherein the method at least comprises the following steps of: storing an original signal by utilizing a first frequency; reading the stored signal by utilizing a second frequency; carrying out carrier modulation on the stored signal; and carrying out power control on the stored signal after carrier modulation and then outputting. Simultaneously, the invention further discloses a device for simulating the channel, which comprises a signal reading-writing module, a signal modulation module and a power control module, wherein the signal reading-writing module is used for storing the original signal by utilizing the first frequency and reading the stored signal by utilizing the second frequency; the signal modulation module is used for carrying out carrier modulation on the stored signal; and the power control module is used for carrying out power control on the stored signal after carrier modulation. Through the application of the method and the device, time delay, Doppler shift and power attenuation can be added for the original signal, so that the transmission of the original signal in the channel can be simulated.
Description
Technical field
The invention belongs to the Satellite Navigation Technique field, relate to a kind of Navsat inter-satellite link channel simulation method and device.
Background technology
GPS (Global Position System) take GPS of America as representative increases inter-satellite link in the recent period successively, thereby realizes without the networking autonomous navigation of satellite in ground master station support situation.At present GPS brings up to 6m with the user's bearing accuracy in 180 days forecasting periods from 5000m by this technology, has significantly improved the availability of GPS in war and other particular surroundings.And the Beidou satellite navigation system of China carries out the design of big-dipper satellite inter-satellite link scheme at present, and Navsat inter-satellite link signal imitation method can be its ground design checking that this scheme is provided.
Between the satellite navigation constellation star, the link signal generation system is in order to solve the key equipment of Navsat satellite borne equipment ground validation problem.The radiofrequency signal simulation is according to the inter-satellite link mathematic simulated mode, and Reality simulation inter-satellite link signal generates the inter-satellite link radiofrequency signal in real time, can be for the research and development of inter-satellite link plan-validation and inter-satellite link receiver.
To the blockade of inter-satellite link technology, still can not find external inter-satellite link signal generating system pertinent literature due to abroad.And domesticly still be in the starting stage for Navsat inter-satellite link signal generation technique.And at present the simulation of inter-satellite link signal is adopted mostly the mode of software emulation, its simulate effect is near theoretical analysis result, and authenticity is relatively poor.Adopt the radiofrequency signal simulation will increase the authenticity of signal imitation for the Navsat inter-satellite link, can carry out ground validation to the Future Projects implementation in real time.
Summary of the invention
The technical matters that the present invention solves is: one aspect of the present invention provides a kind of Navsat inter-satellite link channel simulation method, can add time delay, Doppler shift and power attenuation for original signal by the method, thereby can simulate the transmission of original signal in channel.
The present invention simultaneously also provides a kind of channel simulation device, this device is by adopting different frequencies that original signal has been carried out implementing reading and writing to the time-delay of original signal and added Doppler frequency deviation, and utilizes signal modulation module and power control module to obtain and the matched simulating signal of characteristics of signals.
Technical solution of the present invention is:
A kind of Navsat inter-satellite link channel simulation method comprises the following steps at least:
Utilize first frequency with original signal and store;
Utilize second frequency to read the rear signal of storage, described second frequency can equate also can not wait with described first frequency;
Signal after described storage is carried out carrier modulation;
Described storage signal after carrier modulation is carried out exporting after power is controlled.
Described original signal is base-band spread-spectrum signal.
Described original signal is one-channel signal or the two-way signal of quadrature each other.
Described power is controlled to be the storage signal after described carrier modulation is added decay.
A kind of channel simulation device comprises:
Utilize first frequency that original signal is stored, and utilize second frequency to read the signal module for reading and writing of the rear signal of storage;
Signal after described storage is carried out the signal modulation module of carrier modulation;
Storage signal after carrier modulation is carried out the power control module that power is controlled.
Also comprise the signal demodulation module that obtains described original signal by demodulation; Described original signal is base-band spread-spectrum signal.
Described power control module is used to the storage signal after described carrier modulation to add decay.
The present invention compared with prior art has following advantage:
The present invention successively reads and stores original signal by first frequency and second frequency, thereby utilize two differences between frequency, completed operation from carrier doppler to original signal that add code Doppler and, simultaneously, after completing interpolation code Doppler and carrier doppler, further the signal after modulation is carried out power and control, thereby completed the simulation that signal is decayed in transmitting procedure.In the concrete engineering stage, can determine the parameter that first frequency used, second frequency and power are controlled according to the concrete condition of code Doppler, carrier doppler and signal attenuation to the simulation process of signal, therefore realize simply, and extensibility is strong.
Description of drawings
Fig. 1 is Doppler frequency deviation simulation process figure;
Fig. 2 is the signal imitation module frame chart;
Embodiment
Below just by reference to the accompanying drawings the present invention is described further.
Signal goes out middle transmission at channel can produce time delay, Doppler frequency deviation and power attenuation.In an embodiment of the present invention, in order to produce the simulating signal of Navsat, need to be according to the situation of Navsat channel, the simulation navigational satellite signal that is modulated to carrier wave that produces for this locality adds the simulation to channel, is this simulation navigational satellite signal and produces time delay, Doppler frequency deviation and power attenuation.
For achieving the above object, in this embodiment, the signal that original signal can obtain after demodulation for above-mentioned simulation navigational satellite signal, store according to first frequency, read signal after storage according to second frequency again after storage is completed, thereby add in this original signal by storage and the time delay that the mistiming conduct between reading is transmitted in channel.And this first frequency is not identical with second frequency, thereby can produce frequency shift (FS) in storage and the process that reads, and namely adds Doppler frequency deviation in original signal.
This time delay and Doppler frequency deviation can arrange according to channel situation to be simulated.In signals transmission, the Doppler of carrier wave and code is opposite frequency deviation (as in ionosphere) in some cases, therefore needs the Doppler's separation simulation with carrier wave and code.
Simulation process as shown in Figure 1, suppose that the original signal carrier frequency is fRF, bandwidth is B, it is v that signal transmits and receives the end relative velocity, the light velocity is c, its Doppler's Δ f=fRF*v/c, the signal bandwidth B ' that receiving end receives=B* (1+v/c), radio-frequency carrier is: fRF '=fRF+ Δ f=fRF* (1+v/c).
The Doppler simulation that this signal produces when propagating is simulated respectively on carrier wave and code, its all processes is that original signal first downconverts to intermediate frequency fc, after the phaselocked loop mixing and filtering was peeled off carrier wave, the baseband signal of acquisition was sampled with fw speed and is deposited in storer; With fr speed reading memory data, be modulated on the carrier wave that frequency is fc+ Δ f, being modulated to radio frequency through up-conversion, realize Doppler's function of channel simulation.This process is carried out Doppler simulation to carrier wave and code respectively.
● the carrier doppler simulation
On carrier wave, the carrier frequency of setting its rear end intermediate frequency output signal modulation is fc+ Δ f, and after upconverting to radio frequency, its carrier frequency is fRF+ Δ f, has realized the Doppler simulation of carrier wave.
● the code Doppler simulation
On code, it is fr/B`=fw/B with corresponding bandwidth relationship that clock is read in storage; When it read clock setting and is fr=fw* (1+v/c), its bandwidth was B`=B* (1+v/c), thus when with fw to signal storage, during to signal-obtaining, can realize the Doppler simulation of code with fr.
In said process, original signal can for being in the baseband signal of carrier wave after demodulation, also can be the spread-spectrum signal of simulation navigational satellite signal through the demodulation acquisition.
After the interpolation of completing above-mentioned time delay and Doppler frequency deviation, in carrier wave, this carrier modulation technology can be BPSK or QPSK etc. to recycling carrier modulation technology, thereby can produce corresponding one road one-channel signal or I/Q two paths of signals with this signal system.
For the signal after carrier modulation, further control by power signal is decayed, thereby settling signal is simulated through after whole channel.
In another embodiment of the invention, utilize channel simulation device can complete channel simulation to original signal, as Fig. 2, this channel simulation device comprises signal module for reading and writing, signal modulation module and power control module.
The signal module for reading and writing adopts two different frequencies that original signal is stored and read, can to one the road or parallel defeated as the two-way original signal process, its a kind of implementation is to comprise I/O FIFO, first frequency generator, second frequency generator, peripheral hardware RAM.
The first frequency generator is for generation of the frequency f w of storage original signal, and the second frequency generator is for generation of the frequency f r that reads original signal.At first input FIFO receives the original signal of input, the signal in input FIFO according to frequency f w storage in peripheral hardware RAM, after storage is completed, reading from this peripheral hardware RAM according to frequency f r, and again exporting through output FIFO.
The signal modulation module carries out carrier modulation to the signal of signal module for reading and writing output, the mode of carrier modulation can be modulated this signal according to the carrier modulation mode of the signal of analog transmission in channel, for example in navigation satellite applications, its carrier modulation adopts QPSK, therefore, its carrier modulation can adopt QPSK.
The signal of exporting after the signal modulation module carries out power at power control module and controls, and the signal degrade condition for the adaptive channel transmission in this module, multiplies each other the signal after carrier modulation and attenuation coefficient, thereby obtains the deamplification after power is controlled.
In said apparatus, for obtaining the original signal of input, device can also comprise the signal demodulation module, the signal demodulation can be removed the carrier wave of input signal, but the spreading code that keeps input signal, thereby obtain the original signal of spread spectrum, but also the carrier wave spreading code of input signal all can be removed, thereby obtain the original of non-spread spectrum.A kind of implementation of this module is, comprise local carrier generator, phase detector, the local carrier generator produces the local carrier that adapts with the input signal carrier wave, thereby the carrier wave of removing input signal by this local carrier can be modulated to base band with input signal, input signal after the removal carrier wave is in output, be input to phase detector, the carrier wave of local carrier generator output is adjusted according to the baseband signal of input by phase detector, thereby further produced the local carrier that adapts with the input signal carrier wave.In the another kind of implementation of this module, can further include the spreading code generator, for generation of spreading code, baseband signal is carried out spread spectrum.
The unspecified part of the present invention belongs to general knowledge as well known to those skilled in the art.
Claims (7)
1. Navsat inter-satellite link channel simulation method is characterized in that comprising the following steps at least:
Utilize first frequency with original signal and store;
Utilize second frequency to read the rear signal of storage;
Signal after described storage is carried out carrier modulation;
Described storage signal after carrier modulation is carried out exporting after power is controlled.
2. method as claimed in claim 1, is characterized in that, described original signal is base-band spread-spectrum signal.
3. method as claimed in claim 1 or 2, is characterized in that, described original signal is one-channel signal or the two-way signal of quadrature each other.
4. method as claimed in claim 1, is characterized in that, described power is controlled to be the storage signal after described carrier modulation is added decay.
5. a channel simulation device, is characterized in that, comprising:
Utilize first frequency that original signal is stored, and utilize second frequency to read the signal module for reading and writing of the rear signal of storage;
Signal after described storage is carried out the signal modulation module of carrier modulation;
Storage signal after carrier modulation is carried out the power control module that power is controlled.
6. channel simulation device as claimed in claim 5, is characterized in that, also comprises the signal demodulation module that obtains described original signal by demodulation; Described original signal is base-band spread-spectrum signal.
7. channel simulation device as claimed in claim 5, is characterized in that, described power control module is used to the storage signal after described carrier modulation to add decay.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105530043A (en) * | 2015-12-07 | 2016-04-27 | 中国电子科技集团公司第十研究所 | Airborne terminal compatible with dual-system satellite communication link work |
| CN107888281A (en) * | 2017-11-08 | 2018-04-06 | 西安电子科技大学 | A kind of high dynamic optic communication Simulation Doppler Frequency-Shift system |
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| CN101825699A (en) * | 2010-03-15 | 2010-09-08 | 中国电子科技集团公司第十研究所 | Method for simulating dynamic target signals with high accuracy |
| CN102759730A (en) * | 2012-07-16 | 2012-10-31 | 中国电子科技集团公司第十研究所 | Universal-type ultrahigh-accuracy dynamic simulator |
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| JPH0993210A (en) * | 1995-09-22 | 1997-04-04 | Fujitsu Ltd | Radio transmission channel simulator |
| EP1746747A1 (en) * | 2005-07-21 | 2007-01-24 | DLR Deutsches Zentrum für Luft- und Raumfahrt e.V. | Method for emulating a multi-path transmission channel |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105530043A (en) * | 2015-12-07 | 2016-04-27 | 中国电子科技集团公司第十研究所 | Airborne terminal compatible with dual-system satellite communication link work |
| CN107888281A (en) * | 2017-11-08 | 2018-04-06 | 西安电子科技大学 | A kind of high dynamic optic communication Simulation Doppler Frequency-Shift system |
| CN107888281B (en) * | 2017-11-08 | 2020-04-14 | 西安电子科技大学 | High-dynamic optical communication Doppler frequency shift simulation system |
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