CN116381739A - AltBOC signal processing method and system and satellite signal receiver - Google Patents
AltBOC signal processing method and system and satellite signal receiver Download PDFInfo
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Abstract
The embodiment of the application discloses a processing method and a processing system of an AltBOC signal. The method comprises the following steps: receiving an AltBOC signal with complete frequency spectrum width, and processing the AltBOC signal by using a local carrier wave to obtain a baseband signal; generating local modulation pseudo codes and subcarrier codes of branches at different delay moments of the baseband signal according to pseudo code control information, and generating local pilot frequency composite pseudo codes of the branches at different delay moments according to the local modulation pseudo codes and subcarrier codes; and obtaining correlation and coherence accumulation values of branches at different delay moments according to the local pilot frequency composite pseudo codes of the branches at different delay moments and the baseband signals, and updating the local carrier and the pseudo code control information by using the correlation and coherence accumulation values of the branches at different delay moments.
Description
Technical Field
The embodiment of the application relates to the field of satellite navigation, in particular to a method and a system for processing AltBOC signals.
Background
In order to fully utilize frequency point resources in a limited frequency band and realize coexistence of navigation signals and no mutual interference, the three GNSS systems of GALILEO, GPS and BDS adopt methods of binary offset carrier (Binary Offset Carrier, BOC) modulation, multiplexed Binary Offset Carrier (MBOC) modulation derived from BOC modulation, alternate binary offset carrier (AltBOC) modulation and the like for partial frequency division, so as to achieve the aim of code division spectrum modulation and realize signal spectrum movement. For example, the GALILEO system E5 band signal is a composite signal with a center frequency point of 1195.795MHz, and is formed by two E5a frequency bands (center frequency point 1176.45 MHz) and E5b frequency bands (center frequency point 1207.14 MHz) by adopting a constant envelope AltBOC (15, 10) modulation technology; for example, the B2 band signal of the BDS also adopts the modulation technique, and is a composite signal with a center frequency point of 1195.795MHz, which is formed by two frequency bands of a B2a frequency band (center frequency point 1176.45 MHz) and a B2B frequency band (center frequency point 1207.14 MHz); the modulation technology adopts composite subcarrier, and the upper sideband and the lower sideband can respectively modulate different navigation messages and pseudo-random codes, so that the modulation technology has the characteristics of high frequency band utilization rate and strong anti-interference performance.
However, the signal receiving of the current AltBOC modulation technology cannot fully exert the advantages of the AltBOC modulation mode, and the modulation effect is to be improved.
Disclosure of Invention
The embodiment of the application provides a processing method and system of an AltBOC signal and a satellite signal receiver, which can exert the advantages of the AltBOC modulation mode and improve the modulation effect.
In one aspect, an embodiment of the present application provides a method for processing an AltBOC signal, including:
receiving an AltBOC signal with complete frequency spectrum width, and processing the AltBOC signal by using a local carrier wave to obtain a baseband signal;
generating local modulation pseudo codes and subcarrier codes of branches at different delay moments of the baseband signal according to pseudo code control information, and generating local pilot frequency composite pseudo codes of the branches at different delay moments according to the local modulation pseudo codes and subcarrier codes;
and obtaining correlation and coherence accumulation values of branches at different delay moments according to the local pilot frequency composite pseudo codes of the branches at different delay moments and the baseband signals, and updating the local carrier and the pseudo code control information by using the correlation and coherence accumulation values of the branches at different delay moments.
On the other hand, the embodiment of the application also provides a processing system of the AltBOC signal, which comprises:
the signal processing device is used for receiving the AltBOC signal with complete frequency spectrum width, and processing the AltBOC signal by utilizing a local carrier wave to obtain a baseband signal;
the pilot frequency generating device is used for generating local modulation pseudo codes and subcarrier codes of branches of different delay moments of the baseband signal according to the pseudo code control information;
the pilot frequency processing device generates local pilot frequency composite pseudo codes of branches at different delay moments according to the local modulation pseudo codes and the subcarrier codes;
and the signal computing device is used for obtaining the correlation and coherent accumulation values of the branches at different delay moments according to the local pilot frequency composite pseudo codes of the branches at different delay moments and the baseband signals, and updating the local carrier and the pseudo code control information by using the correlation and coherent accumulation values of the branches at different delay moments.
In yet another aspect, embodiments of the present application also provide a satellite signal receiver comprising a processor and a memory storing a computer program executable on the processor for implementing the method described above.
One of the above technical solutions has the following advantages or beneficial effects:
the local pilot frequency composite pseudo code with the complete frequency spectrum width is obtained, then the baseband signal with the complete frequency spectrum width is calculated by utilizing the local pilot frequency composite pseudo code, the coherent signal of the whole signal broadband and the broadband AltBOC can be tracked, the tracking state of the double sidebands is obtained, the calculation of the data information of the double sidebands is facilitated, the purpose of fully playing the advantages of the AltBOC modulation mode is achieved, and the modulation effect is improved.
Additional features and advantages of embodiments of the application will be set forth in the description which follows, and in part will be apparent from the description, or may be learned by practice of embodiments of the application. The objectives and other advantages of the embodiments of the present application will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
Drawings
The accompanying drawings are included to provide a further understanding of the technical solutions of the embodiments of the present application, and are incorporated in and constitute a part of this specification, illustrate the technical solutions of the embodiments of the present application and not constitute a limitation to the technical solutions of the embodiments of the present application.
Fig. 1 is a flow chart of a processing method of an AltBOC signal according to an embodiment of the present application;
fig. 2 is a schematic diagram of a generation manner of a local pilot frequency composite pseudo code of an instant leg according to an embodiment of the present application;
fig. 3 is a schematic structural diagram of an AltBOC signal processing system according to an embodiment of the present application;
fig. 4 is another schematic diagram of the system shown in fig. 3.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present application more apparent, the embodiments of the present application will be described in detail hereinafter with reference to the accompanying drawings. It should be noted that, without conflict, the embodiments of the present application and features of the embodiments may be arbitrarily combined with each other.
The receiver-type AltBOC modulation technology mainly receives an upper sideband or a lower sideband signal at a receiving end, for example, separates an E5 frequency point of a GALILEO system into an E5a frequency point or an E5B frequency point, or separates a B2 frequency point of a Beidou system into a B2a frequency point or a B2B frequency point, and adopts a binary phase shift keying (Binary Phase Shift Keying, BPSK) or quadrature phase shift keying (Quadrature Phase Shift Keying, QPSK) mode to receive the signal independently, wherein the front-end bandwidth of the receiver is narrower, but the advantages of the AltBOC modulation technology are ignored; the other method is to receive the double-sideband whole frequency band, but still adopts a down-conversion module to divide the whole frequency band into an upper sideband and a lower sideband for processing, adopts two paths of correlators to be respectively related with the upper sideband phase signal and the lower sideband phase signal, and finally carries out weighted combination processing on the upper sideband result and the lower sideband result.
To this end, an embodiment of the present application provides a method for processing an AltBOC signal, as shown in fig. 1, where the method includes:
the AltBOC signal is composed of two frequency bands, which are defined as an A frequency point and a B frequency point, and correspond to a lower sideband and an upper sideband frequency point of the AltBOC signal respectively, for example, an E5a frequency point and an E5B frequency point of an E5 signal of a Galileo (GALILEO) system or a B2a frequency point and a B2B frequency point of a B2 signal of a Beidou system.
In this step, since the received signal is an AltBOC signal with a complete spectrum width, the AltBOC signal includes an upper sideband frequency point and a lower sideband frequency point, and correspondingly, the baseband signal also includes an upper sideband frequency point and a lower sideband frequency point.
in this step, since the baseband signal includes an upper sideband frequency point and a lower sideband frequency point, the obtained local modulation pseudo code and subcarrier code are obtained based on the baseband signal including the upper sideband frequency point and the lower sideband frequency point, and the generated local pilot frequency composite pseudo code includes pilot frequency information of the upper sideband frequency point and the lower sideband frequency point.
Specifically, the local pilot frequency composite pseudo code of the delay time branch is generated by acquiring the local modulation pseudo code and the subcarrier code of the same delay time branch and then according to the local modulation pseudo code and the subcarrier code of the delay time branch;
the delay time (also called as delay time) comprises instant time, lead time and lag time, and the branches with different delay time comprise instant branches corresponding to the instant time, lead branches corresponding to the lead time and lag branches corresponding to the lag time; wherein:
the method comprises the steps of obtaining a local modulation pseudo code and a subcarrier code of an instant branch, and generating a local pilot frequency composite pseudo code of the instant branch according to the local modulation pseudo code and the subcarrier code of the instant branch;
the local pilot frequency composite pseudo code of the advanced branch is generated by acquiring the local modulation pseudo code and the subcarrier code of the advanced branch and then according to the local modulation pseudo code and the subcarrier code of the advanced branch;
the local pilot frequency composite pseudo code of the delay branch is generated by acquiring the local modulation pseudo code and the subcarrier code of the delay branch and then according to the local modulation pseudo code and the subcarrier code of the delay branch.
And 103, obtaining correlation and coherence accumulation values of branches at different delay moments according to the local pilot frequency composite pseudo codes of the branches at different delay moments and the baseband signals, and updating the local carrier wave and the pseudo code control information by using the correlation and coherence accumulation values of the branches at different delay moments.
In this step, the local pilot frequency composite pseudo code includes pilot frequency information of the upper sideband frequency point and the lower sideband frequency point, and then the local pilot frequency composite pseudo code is utilized to calculate baseband signals including the upper sideband frequency point and the lower sideband frequency point, so that the whole signal broadband can be processed, and the coherent signals of the broadband can be tracked, so as to obtain the tracking state of the double sidebands, and the method is favorable for resolving data information of the double sidebands, so that the purpose of fully playing the advantages of the AltBOC modulation mode is achieved, and the modulation effect is improved.
Specifically, a baseband signal and a local pilot frequency composite pseudo code of an instant branch are utilized to obtain a correlation and a coherent accumulation value of the instant branch, and a new local carrier is obtained by utilizing the correlation and the coherent accumulation value of the instant branch, wherein the new local carrier is used for obtaining a baseband signal corresponding to a next AltBOC signal, so that a carrier loop is formed.
Obtaining the correlation and coherent accumulation value of the advanced branch by using the baseband signal and the local pilot frequency composite pseudo code of the advanced branch; and obtaining a new pseudo code control information by utilizing the local pilot frequency composite pseudo code of the baseband signal and the lagging branch to obtain a correlation and a coherent accumulation value of the lagging branch and utilizing the correlation and the coherent accumulation value corresponding to the leading branch and the lagging branch, wherein the new pseudo code control information is used for obtaining a local modulation pseudo code and a subcarrier code corresponding to the next baseband signal, thereby forming a pseudo code loop.
According to the method provided by the embodiment of the application, the local pilot frequency composite pseudo code with the complete frequency spectrum width is obtained, the baseband signal with the complete frequency spectrum width is calculated by utilizing the local pilot frequency composite pseudo code, the whole signal broadband can be processed, the coherent signal of the broadband AltBOC can be tracked, the tracking state of the double sidebands can be obtained, the calculation of the data information of the double sidebands is facilitated, the purpose of fully playing the advantages of the AltBOC modulation mode is achieved, and the modulation effect is improved.
In an exemplary embodiment, the receiving the AltBOC signal with a complete spectrum width, and processing the AltBOC signal by using a local carrier to obtain a baseband signal includes:
receiving an AltBOC signal with complete frequency spectrum width, wherein the AltBOC signal with complete frequency spectrum width comprises an upper sideband frequency point and a lower sideband frequency point, an in-phase branch signal and a quadrature branch signal are obtained through frequency mixing down-conversion, the in-phase branch signal is used as a real part, and the quadrature branch signal is used as an imaginary part, so that an intermediate frequency signal in a complex form is obtained;
specifically, the AltBOC signal with the complete spectrum width is multiplied and mixed with sine wave and cosine wave of the local oscillation signal respectively, that is, in-phase/Quadrature (I/Q) mode is adopted, an intermediate frequency signal of an I branch and an intermediate frequency signal of a Q branch can be obtained respectively, an analog-to-digital converter (Analog to Digital Converter, ADC) is utilized to sample the signals on the two branches respectively, the mixed output on the I branch and the Q branch is regarded as a real part and an imaginary part respectively, and then the In-phase/Quadrature mixed mode can output an intermediate frequency signal In a complex form.
And carrying out carrier stripping on the complex intermediate frequency signals to obtain complex baseband signals.
Specifically, the sine carrier and cosine carrier signals are obtained using the local carrier information copied by the carrier digitally controlled oscillator, wherein the locally generated carrier is obtained by the carrier loop apparatus 50. Stripping carrier frequency of the intermediate frequency signal in the complex form of the received signal, multiplying the real part of the intermediate frequency signal by a cosine carrier, multiplying the imaginary part of the intermediate frequency signal by a sine carrier, and subtracting the real part of the intermediate frequency signal from the sine carrier to obtain the real part of the baseband signal; multiplying the real part of the intermediate frequency signal by a sine carrier, multiplying the imaginary part of the intermediate frequency signal by a cosine carrier, and adding the two to obtain the imaginary part of the baseband signal; thereby obtaining a baseband signal in complex form.
In an exemplary embodiment, the generating the local modulation pseudo code and the subcarrier code of the branches of different delay moments of the baseband signal according to the pseudo code control information includes:
and generating a local modulation pseudo code of an upper sideband frequency point and a local modulation pseudo code of a lower sideband frequency point of the AltBOC signal according to pseudo code control information, and generating an approximate subcarrier code by adopting symbol bits of subcarriers to obtain sine subcarrier codes and cosine subcarrier codes of branches at different delay moments.
Further, generating a local modulation pseudo code of an upper sideband frequency point and a local modulation pseudo code of a lower sideband frequency point of the AltBOC signal according to pseudo code control information includes:
for each delay time branch, generating a local pseudo code secondary code and a primary code of an upper sideband frequency point of the current delay time branch according to pseudo code control information, and carrying out exclusive or on the local pseudo code secondary code and the primary code to obtain a local modulation pseudo code of the upper sideband frequency point of the current delay time branch; and generating a local pseudo code secondary code and a primary code of the lower sideband frequency point of the current delay time branch according to the pseudo code control information, and carrying out exclusive or on the local pseudo code secondary code and the primary code to obtain a local modulation pseudo code of the lower sideband frequency point of the current delay time branch.
Further, the pseudo code control information comprises a local code phase and a local code offset;
generating secondary codes and primary codes of sideband frequency points on branches of the baseband signal at different delay moments according to the local code phase;
and generating secondary codes and primary codes of sideband frequency points under branches of different delay moments of the baseband signal according to the local code offset.
In an exemplary embodiment, the generating the local pilot composite pseudo code of different delay time branches according to the local modulation pseudo code and the subcarrier code includes:
for each delay time branch, calculating the difference between the local modulation pseudo code of the lower sideband frequency point and the local modulation pseudo code of the upper sideband frequency point of the current delay time branch, multiplying the obtained difference by the opposite number of the sine subcarrier codes of the current delay time branch, and obtaining the real part value of the local pilot frequency composite pseudo code of the current delay time branch; calculating the sum value between the local modulation pseudo code information of the lower sideband frequency point and the local modulation pseudo code information of the upper sideband frequency point of the current delay time branch, multiplying the obtained sum value with the opposite number of the cosine subcarrier codes of the current delay time branch, and obtaining the imaginary part value of the local pilot frequency compound pseudo code of the current delay time branch;
and generating the local pilot frequency composite pseudo code of the complex form current delay time branch according to the real part value of the local pilot frequency composite pseudo code and the imaginary part value of the local pilot frequency composite pseudo code.
In one exemplary embodiment, the sign bits of the subcarriers are employed to generate an approximated subcarrier code.
Further, the cosine subcarrier code of any delay time branch is determined by
The sine subcarrier code of any delay time branch is determined by the following method
Wherein f sub The frequency of the subcarrier is indicated, and t is the delay time.
In the above-described exemplary embodiments, the subcarrier code is determined in symbol bits, and the computational complexity of the subcarrier code can be reduced as compared with the subcarrier code obtained by using a four-level subcarrier function.
The method shown in fig. 1 is described below in connection with an application scenario:
taking an AltBOC modulation signal of a Galileo system E5 frequency point as an example, the execution process is described as follows:
step 1: performing frequency mixing down-conversion processing on the received AltBOC signal with complete frequency spectrum width, and outputting an intermediate frequency signal, wherein the frequency mixing down-conversion processing comprises the following steps:
step 101: and multiplying and mixing the AltBOC signal with the complete frequency spectrum width with sine wave and cosine wave of the local oscillation signal respectively, namely adopting an in-phase/quadrature mixing mode, and obtaining an intermediate frequency signal of the I branch and the Q branch respectively.
Step 102: the signals on the two branches are sampled respectively, and the mixed frequency output on the I and Q branches is regarded as a real part and an imaginary part respectively, so that an intermediate frequency signal in a complex form is obtained;
wherein the complex intermediate frequency signal is S IF (t)＝S IF,I (t)+jS IF,Q And (t) after the received signal is subjected to pre-filtering, the power intermodulation component in the signal is filtered, so that the intermediate frequency signal can be simplified into the following expression.
Wherein d AI (t)、d BI (t) data stream information of an upper sideband frequency point and a lower sideband frequency point respectively; c AI (t)、c AQ (t) is the same as the upper sideband frequency point respectivelyModulating pseudo code of phase branch and quadrature branch, c BI (t)、c BQ (t) the modulation pseudo codes of the in-phase branch and the quadrature branch of the upper sideband frequency point respectively; sc S Is a subcarrier function, T sub For the period of the subcarrier signal,
is carrier information.
Step 2: carrier stripping is carried out on the intermediate frequency signal to obtain a baseband signal, which comprises the following steps:
step 201: obtaining a sine carrier and a cosine carrier by utilizing a local carrier;
wherein the sine carrier wave and the cosine carrier wave signals are respectively
Wherein->
Is a local carrier; wherein the local carrier is obtained by step 6.
Step 202: carrying out carrier stripping on the complex intermediate frequency signals to obtain baseband signals;
multiplying the real part of the intermediate frequency signal by a cosine carrier, multiplying the imaginary part of the intermediate frequency signal by a sine carrier, and subtracting the imaginary part from the sine carrier to obtain the real part of the baseband signal; multiplying the real part of the intermediate frequency signal by a sine carrier, multiplying the imaginary part of the intermediate frequency signal by a cosine carrier, and adding the two to obtain the imaginary part of the baseband signal, thereby obtaining the baseband signal in a complex form;
wherein the real part S of the baseband signal base The expression of I (t) is as follows:
S base I(t)＝S IF,I (t)·U oc (t)-S IF,Q (t)·U os (t)
wherein the imaginary part S of the baseband signal base The expression of Q (t) is as follows:
S base Q(t)＝S IF,I (t)·U os (t)+S IF,Q (t)·U oc (t)；
the above processing can obtain complex baseband signal S base (t) wherein the baseband signal S base The expression of (t) is as follows:
S base (t)＝S base I(t)+jS base Q(t)。
step 3: generating the secondary code, the primary code and the subcarrier code of the E5A frequency point Q branch, and generating the secondary code, the primary code and the subcarrier code of the E5B frequency point Q branch comprises:
step 301: generating a secondary code and a primary code of an instant branch of an E5A frequency point Q branch by using the local code phase of the last AltBOC signal, performing exclusive OR calculation on the secondary code and the primary code of the instant branch, and obtaining an E5A frequency point Q branch local modulation pseudo code of the instant branch
Generating a secondary code and a primary code of an instant branch of an E5B frequency point Q branch by using the local code offset of the last AltBOC signal, performing exclusive OR calculation on the secondary code and the primary code, and obtaining an E5B frequency point Q branch local modulation pseudo code of the instant branch->
Wherein t is P Is the instant time.
Step 302: generating an approximate subcarrier code using symbol bits of the subcarrier;
specifically, unlike the four-level subcarrier function generation mode, the method for generating the local cosine subcarrier codes of the instant branch circuits is obtained for simplifying the algorithm
And local sinusoidal subcarrier codes for instant branches
Step 303: step 301 is the same as that of step 301, the local modulation pseudo code of the E5A frequency point Q branch of the advanced branch is obtained
And E5B frequency point Q branch local modulation pseudo code of leading branch +.>
Wherein t is E Is the lead time.
Step 304: step 301 is the same as that of step 301, the local modulation pseudo code of the E5A frequency point Q branch of the lag branch is obtained
And E5B frequency point Q branch local modulation pseudo code of hysteresis branch>
Wherein t is L Is the lag time.
Step 305: step 302 is followed to obtain the local cosine subcarrier code of the leading branch
And local sinusoidal subcarrier code of the leading branch +.>
Step 306: step 302 is followed to obtain the local cosine subcarrier code of the lagging leg
And hysteresis branch local sinusoidal subcarrier code +.>
Step 4: determining local pilot frequency composite pseudo codes of branches at different delay moments comprises the following steps:
step 401: acquisition of local pilot composite pseudo code PRN (t) for instant leg P ) Wherein:
local pilot frequency composite pseudo code PRN (t) of instant branch P ) By real part PRN I (t P ) And imaginary part PRN Q (t P ) StructureThe expression is as follows;
PRN(t P )＝PRN I (t P )+j·PRN Q (t P )；
wherein the real part
And imaginary part->
According to the local modulation pseudo code of the instant branch E5A frequency point Q branch obtained in the step 3 +.>
E5B frequency point Q branch local modulation pseudo code +.>
Local cosine subcarrier code->
And local sinusoidal subcarrier code +.>
) And (3) determining.
Fig. 2 is a schematic diagram of a generation manner of a local pilot frequency composite pseudo code of an instant leg according to an embodiment of the present application. As shown in fig. 2, the specific steps are as follows:
step 4011: the E5B frequency point of the instant branch and the local modulation pseudo code information of the Q branch of the E5A frequency point are subtracted to obtain a difference value;
step 4012: multiplying the difference value in step 4011 by the opposite number of the sine subcarrier codes of the instant branch to obtain the real part of the local pilot frequency composite pseudo code of the instant branch;
step 4013: the local modulation pseudo code information of the E5A frequency point of the instant branch and the local modulation pseudo code information of the Q branch of the E5B frequency point are added to obtain a sum value;
step 4014: multiplying the sum value in step 4013 by the opposite number of the cosine subcarrier codes of the instant branch to obtain the imaginary part of the local pilot frequency composite pseudo code of the instant branch;
the process formulas of step 4011 to step 4014 are as follows:
step 402: in the same step 401, a local pilot composite pseudo code PRN (t) of the advanced leg is acquired E )。
Step 403: in the same way as in step 401, a local pilot composite pseudo code PRN (t) of the lagging leg is obtained L )。
Step 5: performing correlation operation and coherent accumulation operation by using the local pilot frequency composite pseudo code and the baseband signal to obtain correlation coherent accumulation values of branches at different delay moments, wherein the method comprises the following steps:
step 501: local pilot frequency of instant branch is combined with pseudo code PRN (t P ) And baseband signal S base (t) performing correlation operation and coherent accumulation operation to obtain an integral result r of the instant branch P (t) wherein r P,I (t) is the integral result r P The real part of (t), r P,Q (t) is the integral result r P Imaginary part of (t), comprising:
step 5011: multiplying the real part of the local pilot frequency composite pseudo code of the instant branch with the real part of the baseband signal;
step 5012: multiplying the imaginary part of the local pilot frequency composite pseudo code of the instant branch with the imaginary part of the baseband signal;
step 5013: the product of the step 5011 and the step 5012 is differenced, and the integral result r of the instant branch is obtained by integral accumulation P The real part r of (t) P,I (t)；
Step 5014: multiplying the imaginary part of the local pilot frequency composite pseudo code of the instant branch with the real part of the baseband signal;
step 5015: multiplying the real part of the local pilot frequency composite pseudo code of the instant branch with the imaginary part of the baseband signal;
step 5016: product of step 5011 and step 5012The results are added, and the integral result r of the instant branch is obtained by integral accumulation P The real part r of (t) P,Q (t)；
The process formulas of the steps 5011 to 5016 are as follows:
wherein R is BQ (t P ) R is the coherent accumulation result of local modulation pseudo code correlation of the instant branch baseband signal and the E5B frequency point Q moment AQ (t P ) R is the coherent accumulation result of local modulation pseudo code correlation of the instant branch baseband signal and the E5A frequency point Q moment SCcos (t P ) For the coherent accumulation result of the real-time branch baseband signal and the local cosine subcarrier code,
is the difference between the baseband signal carrier and the local carrier.
Step 502: in the same way as in step 501, the integral result r of the leading branch can be obtained E (t)。
Step 503: in the same way as in step 501, the integral result r of the lagging leg can be obtained L (t)。
Step 6: integrating result r of instant branch P And (t) carrying out carrier phase discrimination and carrier loop filtering to obtain a local signal carrier control offset, and adjusting a carrier numerical control oscillator to generate a new local carrier.
Step 7: the integral result r of the leading branch E Integral result r of (t) sum-and-lag branch L And (t) performing code phase identification and code loop filtering to obtain a local code offset, adjusting a code loop digital control oscillator to generate a local code phase, and taking the obtained local code offset and the obtained local code phase as new pseudo code control information.
Fig. 3 is a schematic structural diagram of an AltBOC signal processing system according to an embodiment of the present application. As shown in fig. 3, the system includes:
the signal processing device 10 is configured to receive an AltBOC signal with a complete spectrum width, and process the AltBOC signal by using a local carrier to obtain a baseband signal;
pilot generating means 20 for generating a locally modulated pseudo code and a subcarrier code of the baseband signal based on pseudo code control information;
the pilot frequency processing device 30 generates local pilot frequency composite pseudo codes of branches at different delay moments according to the local modulation pseudo codes and the subcarrier codes;
and the signal computing device 40 is configured to obtain correlation and coherent accumulation values of branches at different delay moments according to the local pilot frequency composite pseudo codes of the branches at different delay moments and the baseband signal, and update the local carrier and the pseudo code control information by using the correlation and coherent accumulation values of the branches at different delay moments.
Fig. 4 is another schematic diagram of the system of fig. 3. The system shown in fig. 4 is described below:
in one exemplary embodiment, the signal processing apparatus 10 includes:
the in-phase/quadrature mixing module 10A is configured to receive an AltBOC signal with a complete spectrum width, where the AltBOC signal with a complete spectrum width includes an upper sideband frequency point and a lower sideband frequency point, obtain an in-phase branch signal and a quadrature branch signal through mixing down-conversion, and use the in-phase branch signal as a real part and the quadrature branch signal as an imaginary part to obtain an intermediate frequency signal in a complex form;
the carrier stripping module 10B is configured to perform carrier stripping on the complex intermediate frequency signal to obtain a complex baseband signal.
In one exemplary embodiment, the full spectral width AltBOC signal includes an upper sideband bin and a lower sideband bin;
the pseudo code control information comprises a local code phase and a local code offset;
the pilot generation device 20 includes:
the modulating pseudo code module 201 is configured to generate a local modulating pseudo code of an upper sideband frequency point and a local modulating pseudo code of a lower sideband frequency point of the AltBOC signal according to pseudo code control information;
the subcarrier code module 202 is configured to generate an approximate subcarrier code by using the sign bit of the subcarrier, and obtain sine subcarrier codes and cosine subcarrier codes of branches at different delay moments.
The modulating pseudo code module 201 is configured to generate, for each delay time branch, a local pseudo code secondary code and a primary code of an upper sideband frequency point of a current delay time branch according to pseudo code control information, and obtain, by exclusive-or, the local pseudo code of the upper sideband frequency point of the current delay time branch from the local pseudo code secondary code and the primary code; and generating a local pseudo code secondary code and a primary code of the lower sideband frequency point of the current delay time branch according to the pseudo code control information, and carrying out exclusive or on the local pseudo code secondary code and the primary code to obtain a local modulation pseudo code of the lower sideband frequency point of the current delay time branch.
Further, the pseudo-code modulating module 201 is configured to generate, according to the local code phase, a secondary code and a primary code of sideband frequency points on branches of the baseband signal at different delay moments; and generating a secondary code and a primary code of a sideband frequency point under branches of different delay moments of the baseband signal according to the local code offset.
Further, the pilot generating device 20 further includes:
a secondary code generating module 20A for generating a secondary code of the local pseudo code according to the pseudo code control information determined by the pseudo code loop module 43;
a primary code generating module 20B for generating a primary code of the local pseudo code according to the pseudo code control information determined by the pseudo code loop module 43;
a subcarrier code generating module 20C for generating a subcarrier code of the local pseudo code according to the pseudo code control information determined by the pseudo code loop module 43;
the subcarrier code module 202 is configured to generate, for each delay time branch, an approximate subcarrier code of the current delay time by using a symbol bit of a subcarrier, and obtain a sine subcarrier code and a cosine subcarrier code of the current delay time branch.
The pilot processing device 30 is configured to calculate, for each delay time branch, a difference between a local modulation pseudo code of a lower sideband frequency point and a local modulation pseudo code of an upper sideband frequency point of the current delay time branch, multiply the obtained difference with an opposite number of sinusoidal subcarrier codes of the current delay time branch, and obtain a real part value of a local pilot composite pseudo code of the current delay time branch; calculating the sum value between the local modulation pseudo code information of the lower sideband frequency point and the local modulation pseudo code information of the upper sideband frequency point of the current delay time branch, multiplying the obtained sum value with the opposite number of the cosine subcarrier codes of the current delay time branch, and obtaining the imaginary part value of the local pilot frequency compound pseudo code of the current delay time branch; and generating the local pilot frequency composite pseudo code of the complex form current delay time branch according to the real part value of the local pilot frequency composite pseudo code and the imaginary part value of the local pilot frequency composite pseudo code.
The subcarrier code module 202 is configured to determine a cosine subcarrier code of any delay time branch by
The subcarrier code module 202 is configured to determine a sinusoidal subcarrier code of any delay time branch by
Wherein f sub The frequency of the subcarrier is indicated, and t is the delay time.
In one exemplary embodiment, the signal computing device 40 includes:
the integrating module 41 is configured to obtain correlation and coherent accumulation values corresponding to the instant branch, the advanced branch and the delayed branch respectively;
a carrier loop module 42, connected to the integrating module 41 and the carrier stripping module 10B, for processing the calculation result of the instant branch to obtain a new local carrier, and sending the new carrier to the carrier stripping module 10B; correspondingly, the carrier stripping module 10B is configured to obtain a baseband signal corresponding to the next AltBOC signal by using the received local carrier;
a pseudo code loop module 43, connected to the integrating module and the pilot frequency generating device 20, for obtaining new pseudo code control information by using the calculation results corresponding to the advanced branch and the delayed branch, and sending the new pseudo code control information to the pilot frequency generating device 20; correspondingly, the pilot generating device 20 is configured to acquire the locally modulated pseudo code and the subcarrier code of the next AltBOC signal by using the received new pseudo code control information.
Further, the integrating module 41 includes an instant branch 41A, a leading branch 41B and a lagging branch 41C; wherein:
the instant branch 41A is configured to obtain a correlation and a coherent accumulation value of the instant branch by using the baseband signal and a local pilot frequency composite pseudo code of the instant branch;
the advanced branch 41B is configured to obtain correlation and coherent accumulation values of the advanced branch by using the baseband signal and a local pilot frequency composite pseudo code of the advanced branch;
the delay branch 41C is configured to obtain a correlation and a coherent accumulation value of the delay branch by using the baseband signal and a local pilot frequency composite pseudo code of the delay branch.
The AltBOC signal is a signal of an E5 frequency band of a Galileo system or a B2 frequency band of a Beidou system.
In summary, the method and system provided in the embodiments of the present application have the following advantages, including:
(1) The scheme for tracking the broadband AltBOC signal is provided, the complete full-band AltBOC signal can be received, and the characteristics of the AltBOC broadband signal can be fully obtained.
(2) The local pilot frequency composite pseudo code simultaneously comprises pilot frequency information of an upper sideband and a lower sideband, a complete double-sideband signal correlation accumulation mode can be adopted, and meanwhile, the tracking state of the double sidebands is obtained, so that the calculation of data information of the double sidebands is facilitated.
(3) The dual loop tracking method, namely the carrier loop and the pseudo code loop, is still used, so that the complexity of the system architecture is reduced.
(4) Although the subcarrier loop is omitted, subcarrier information is still integrated into the local pilot frequency composite information in the form of sign bits, so that the pseudo code tracking accuracy is improved.
The embodiment of the application provides a satellite signal receiver, which comprises a processor and a memory, wherein the memory stores a computer program capable of running on the processor, and the computer program is used for realizing the AltBOC signal processing method. The satellite signal receiver may comprise an AltBOC signal processing system as shown in FIG. 3, the operation of the various means in the AltBOC signal processing system being executable under the control of the processor.
Those of ordinary skill in the art will appreciate that all or some of the steps, systems, functional modules/units in the apparatus, and methods disclosed above may be implemented as software, firmware, hardware, and suitable combinations thereof. In a hardware implementation, the division between the functional modules/units mentioned in the above description does not necessarily correspond to the division of physical components; for example, one physical component may have multiple functions, or one function or step may be performed cooperatively by several physical components. Some or all of the components may be implemented as software executed by a processor, such as a digital signal processor or microprocessor, or as hardware, or as an integrated circuit, such as an application specific integrated circuit. Such software may be distributed on computer readable media, which may include computer storage media (or non-transitory media) and communication media (or transitory media). The term computer storage media includes both volatile and nonvolatile, removable and non-removable media implemented in any method or technology for storage of information such as computer readable instructions, data structures, program modules or other data, as known to those skilled in the art. Computer storage media includes, but is not limited to, RAM, ROM, EEPROM, flash memory or other memory technology, CD-ROM, digital Versatile Disks (DVD) or other optical disk storage, magnetic cassettes, magnetic tape, magnetic disk storage or other magnetic storage devices, or any other medium which can be used to store the desired information and which can be accessed by a computer. Furthermore, as is well known to those of ordinary skill in the art, communication media typically embodies computer readable instructions, data structures, program modules or other data in a modulated data signal such as a carrier wave or other transport mechanism and includes any information delivery media.
Claims (11)
1. A method for processing an AltBOC signal, comprising:
receiving an AltBOC signal with complete frequency spectrum width, and processing the AltBOC signal by using a local carrier wave to obtain a baseband signal;
generating local modulation pseudo codes and subcarrier codes of branches at different delay moments of the baseband signal according to pseudo code control information, and generating local pilot frequency composite pseudo codes of the branches at different delay moments according to the local modulation pseudo codes and subcarrier codes;
and obtaining correlation and coherence accumulation values of branches at different delay moments according to the local pilot frequency composite pseudo codes of the branches at different delay moments and the baseband signals, and updating the local carrier and the pseudo code control information by using the correlation and coherence accumulation values of the branches at different delay moments.
2. The method according to claim 1, characterized in that:
the AltBOC signal with the complete frequency spectrum width comprises an upper sideband frequency point and a lower sideband frequency point;
the generating the local modulation pseudo code and the subcarrier code of the branches of the baseband signal at different delay moments according to the pseudo code control information comprises the following steps:
and generating a local modulation pseudo code of an upper sideband frequency point and a local modulation pseudo code of a lower sideband frequency point of the AltBOC signal according to pseudo code control information, and generating an approximate subcarrier code by adopting symbol bits of subcarriers to obtain sine subcarrier codes and cosine subcarrier codes of branches at different delay moments.
3. The method according to claim 2, wherein generating the local modulation pseudocode of the upper sideband frequency point and the local modulation pseudocode of the lower sideband frequency point of the AltBOC signal according to the pseudocode control information comprises:
for each delay time branch, generating a local pseudo code secondary code and a primary code of an upper sideband frequency point of the current delay time branch according to pseudo code control information, and carrying out exclusive or on the local pseudo code secondary code and the primary code to obtain a local modulation pseudo code of the upper sideband frequency point of the current delay time branch; and generating a local pseudo code secondary code and a primary code of the lower sideband frequency point of the current delay time branch according to the pseudo code control information, and carrying out exclusive or on the local pseudo code secondary code and the primary code to obtain a local modulation pseudo code of the lower sideband frequency point of the current delay time branch.
4. A method according to claim 3, characterized in that:
the pseudo code control information comprises a local code phase and a local code offset;
the generating the local pseudo code secondary code and primary code of the upper sideband frequency point of the current delay time branch according to the pseudo code control information comprises the following steps:
generating secondary codes and primary codes of sideband frequency points on branches of the baseband signal at different delay moments according to the local code phase;
the generating the local pseudo code secondary code and primary code of the lower sideband frequency point of the current delay time branch according to the pseudo code control information comprises the following steps:
and generating secondary codes and primary codes of sideband frequency points under branches of different delay moments of the baseband signal according to the local code offset.
5. The method of claim 3, wherein generating the local pilot composite pseudocode for the different delay time branches from the local modulation pseudocode and subcarrier code comprises:
for each delay time branch, calculating the difference between the local modulation pseudo code of the lower sideband frequency point and the local modulation pseudo code of the upper sideband frequency point of the current delay time branch, multiplying the obtained difference by the opposite number of the sine subcarrier codes of the current delay time branch, and obtaining the real part value of the local pilot frequency composite pseudo code of the current delay time branch; calculating the sum value between the local modulation pseudo code information of the lower sideband frequency point and the local modulation pseudo code information of the upper sideband frequency point of the current delay time branch, multiplying the obtained sum value with the opposite number of the cosine subcarrier codes of the current delay time branch, and obtaining the imaginary part value of the local pilot frequency compound pseudo code of the current delay time branch;
and generating the local pilot frequency composite pseudo code of the complex form current delay time branch according to the real part value of the local pilot frequency composite pseudo code and the imaginary part value of the local pilot frequency composite pseudo code.
6. The method according to claim 2, wherein the generating the approximate subcarrier code using the sign bit of the subcarrier to obtain the sine subcarrier code and the cosine subcarrier code of the branches at different delay moments includes:
the cosine subcarrier code of any delay time branch is determined by the following method
The sine subcarrier code of any delay time branch is determined by the following method
Wherein f sub The frequency of the subcarrier is indicated, and t is the delay time.
7. The method of claim 3, wherein the obtaining correlation and coherent accumulation values for the branches at different delay time instants based on the local pilot composite pseudo code for the branches at different delay time instants and the baseband signal comprises:
for each delay time branch, the correlation and coherent accumulation values are obtained by:
calculating the product of the real part value of the local pilot frequency composite pseudo code of the branch at the current delay moment and the real part value of the baseband signal to obtain a first product result; calculating the product of the imaginary part value of the local pilot frequency composite pseudo code of the branch at the current delay moment and the imaginary part value of the baseband signal to obtain a second product result; integrating and accumulating the difference between the first product result and the second product result to obtain the real part value of the correlation and coherence accumulated value of the branch circuit at the current delay moment;
calculating the product of the imaginary part value of the local pilot frequency composite pseudo code of the branch at the current delay moment and the real part value of the baseband signal to obtain a third product result; calculating the product of the real part value of the local pilot frequency composite pseudo code of the branch at the current delay moment and the imaginary part value of the baseband signal to obtain a fourth product result; integrating and accumulating the sum value between the third multiplication result and the fourth multiplication result to obtain the imaginary part value of the correlation and coherence accumulation value of the current delay time branch;
and generating the correlation and coherence accumulation value of the current delay time branch in complex form according to the real part value of the correlation and coherence accumulation value of the current delay time branch and the imaginary part value of the correlation and coherence accumulation value of the current delay time branch.
8. The method of claim 1, wherein the receiving the full spectrum width AltBOC signal, and processing the AltBOC signal with a local carrier to obtain a baseband signal, comprises:
receiving an AltBOC signal with complete frequency spectrum width, wherein the AltBOC signal with complete frequency spectrum width comprises an upper sideband frequency point and a lower sideband frequency point, an in-phase branch signal and a quadrature branch signal are obtained through frequency mixing down-conversion, the in-phase branch signal is used as a real part, and the quadrature branch signal is used as an imaginary part, so that an intermediate frequency signal in a complex form is obtained;
and carrying out carrier stripping on the complex intermediate frequency signals to obtain complex baseband signals.
9. The method of claim 1, wherein the AltBOC signal is a signal in the E5 band of the galileo system or the B2 band of the beidou system.
10. A system for processing an AltBOC signal, comprising:
the signal processing device is used for receiving the AltBOC signal with complete frequency spectrum width, and processing the AltBOC signal by utilizing a local carrier wave to obtain a baseband signal;
the pilot frequency generating device is used for generating local modulation pseudo codes and subcarrier codes of branches of different delay moments of the baseband signal according to the pseudo code control information;
the pilot frequency processing device is used for generating local pilot frequency composite pseudo codes of branches at different delay moments according to the local modulation pseudo codes and the subcarrier codes;
and the signal computing device is used for obtaining the correlation and coherent accumulation values of the branches at different delay moments according to the local pilot frequency composite pseudo codes of the branches at different delay moments and the baseband signals, and updating the local carrier and the pseudo code control information by using the correlation and coherent accumulation values of the branches at different delay moments.
11. A satellite signal receiver comprising a processor and a memory, the memory storing a computer program executable on the processor for implementing the method of any one of claims 1 to 9.
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