CN113791402A - Hybrid data conversion tracking method aiming at weight balance Dow code - Google Patents
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Abstract
The invention relates to a mixed data conversion tracking method aiming at weight balance Dow's codes, belonging to the technical field of deep space pseudo code ranging; when the tracking state is in an unlocked state during code clock tracking, the phase discrimination of the phase-locked loop is respectively discriminated with the related integral input loops of the in-phase branch and the middle-phase branch by using a C1 code sequence; when the tracking state is in a pre-locking state during code clock tracking, using an incompletely synchronous pseudo code sequence to simultaneously discriminate with the relevant integral input loops of the in-phase branch circuit and the middle-phase branch circuit; finally, the conversion tracking of the mixed data is realized, and the high-precision and high-sensitivity signal regeneration of the weight balance Douglas code can be completed according to the method; the invention greatly improves the tracking performance of the regenerated pseudo code loop, thereby effectively improving the ranging precision in deep space and low signal-to-noise ratio, greatly reducing the ranging jitter and simultaneously enhancing the ranging reliability.
Description
Technical Field
The invention belongs to the technical field of deep space pseudo code ranging, and relates to a hybrid data conversion tracking method for a weight balance Dow's code.
Background
With the success of Mars probe I in China landing on Mars Utober plain, the pace of human exploration in deep space is deeper and farther. The ranging in the space measurement and control is mainly based on bidirectional coherent forwarding ranging, such as sequential tone ranging, tone-code mixed ranging, sidetone ranging and the like. For the deep space detection at a longer distance, the ranging accuracy of some common ranging modes cannot meet the requirements, for example, the side tone ranging is performed, in order to ensure the sufficient ambiguity resolution capability of the side tone, the number and the modulation degree of the side tone to be transmitted are increased, and the problem of ambiguity resolution capability and ranging accuracy is effectively solved by the regenerated pseudo code. In deep space ranging, due to the fact that an aircraft is far away from the earth, when an uplink signal transmitted by a deep space ground station reaches the aircraft, the signal-to-noise ratio of the signal is extremely low, and ranging signals are usually submerged in noise. When the aircraft transponder coherently forwards the ranging signal, a wider forwarding bandwidth is needed, and the noise power in the forwarding bandwidth and the ranging signal are forwarded to a ranging downlink together, so that the ranging signal received by the ground station is seriously degraded, and even ranging failure may be caused; when the regenerative ranging is adopted, the aircraft transponder synchronously tracks the ranging signals going upwards and regenerates the ranging signals going downwards. Under the condition that the uplink ranging signal power and the downlink ranging modulation degree are the same, the coherent regeneration ranging can obtain a larger downlink ranging signal-to-noise ratio compared with the coherent forwarding ranging, and therefore higher ranging accuracy can be achieved; or when the same ranging accuracy is achieved, the regenerative ranging can adopt a smaller downlink ranging modulation degree, so that more signal power can be distributed to the telemetry signal. The traditional lateral tone distance measurement needs a more complex distance capture process. By adopting a regenerative ranging mode, the pseudo code ranging and distance capturing process is simple, the distance capturing is simpler and more concise, and the ranging process of the ground station is greatly simplified. Therefore, the regenerative pseudo code ranging will become the mainstream method of deep space ranging. For regenerative pseudo-code ranging, the pseudo-code phase tracking loop is directly related to the ranging performance. As the human beings become deeper and farther from the space detection range, the signal-to-noise ratio is further deteriorated due to the harsh space environment, the pseudo-code loop proposed in CCSDS will become less reliable, and thus the performance of the pseudo-code phase tracking loop will need to be further improved.
Disclosure of Invention
The technical problem solved by the invention is as follows: the method overcomes the defects of the prior art, provides a mixed data conversion tracking method aiming at the weight balance Dow-Chives code, and greatly improves the tracking performance of a regenerated pseudo code loop, thereby effectively improving the ranging precision under the deep space and low signal-to-noise ratio, greatly reducing the ranging jitter and simultaneously enhancing the ranging reliability.
The technical scheme of the invention is as follows:
a mixed data conversion tracking method aiming at weight balance Dow's codes comprises the following steps:
step one, receiving a pseudo code ranging signal transmitted from the outside; setting 2 states of a reference sequence, namely a State1 State and a State2 State; when the tracking loop is in an unlocked State, selecting the State1 State for the reference sequence;
step two, carrying out correlation integration on each chip in the pseudo code ranging signal in sequence according to the in-phase clock to obtain an in-phase integral value A of each chipi(ii) a Sequentially carrying out correlation integration on each chip in the pseudo code ranging signal according to the middle phase clock to obtain a middle phase integral value B of each chipi(ii) a i is the serial number of each code piece in the pseudo code ranging signal;
step three, integrating the in-phase value A of each chipiPerforming correlation calculation with the reference sequence of State1 State to obtain in-phase Sum value SumIn phase(ii) a The middle phase integral value B of each chipiPerforming correlation calculation with the reference sequence of State1 State to obtain a Sum of the phases SumMiddle phase；
Step four, the same phase Sum value Sum is pairedIn phaseSum of the Sum phaseMiddle phasePerforming loop phase discrimination to obtain a loop phase discrimination result D;
inputting a loop phase discrimination result D into a loop filter, and outputting a frequency control word;
modulating the phase of a reference sequence in the State1 State according to the frequency control word; step seven, repeating the step three to the step six until the tracking loop reaches a preset locking threshold, and at the moment, the tracking loop enters a pre-locking state;
step eight, after entering a pre-locking state, respectively searching code phases of C2-C6 code sequences in the weight balance Dow's code; unifying code phases of the C2-C6 code sequence; synthesizing the C1-C6 code sequence to obtain an incompletely synchronous pseudo-code sequence;
step nine, after the incompletely synchronous pseudo-code sequence is obtained, switching the reference sequence to a State2 State;
step ten, repeating the step three to the step six until the incompletely synchronized pseudo code sequence is gradually adjusted into a completely synchronized pseudo code sequence under the loop traction; meanwhile, the tracking loop reaches a locking threshold, a regenerated pseudo code sequence is output, mixed data conversion tracking is completed, and high-precision and high-sensitivity signal regeneration of the weight balance Douglas Waals code is completed.
In the hybrid data conversion tracking method for the weight-balanced Dow-Chi code, in the first step, in the State1 State, the reference sequence adopts the C1 code sequence in the weight-balanced Dow-Chi code; the code sequence of C1 is +1, -1, +1, -1, … …, +1, -1.
In the hybrid data conversion tracking method for the weight-balanced Dow-Walsh code, under the State2 State, the reference sequence adopts the incompletely synchronized pseudo-code sequence.
In the hybrid data conversion tracking method for the weight-balanced ashorts code, the pseudo code sequence is a synthesized sequence of a sequence from a C1 code sequence to a C6 code sequence in the weight-balanced ashorts code.
In the above-mentioned hybrid data conversion tracking method for weight-balanced Dow-Chi code, in the third step, since the reference sequence of State1 State is C1 code sequence, the Sum of the same phase and Sum is SumIn phaseThe calculation method comprises the following steps:
Sumin phase＝A1·(+1)+A2·(-1)+A3·(+1)+A4·(-1)+……+An-1·(+1)+An·(-1)
Wherein n is the total number of chips of the pseudo code ranging signal.
In the above-mentioned hybrid data conversion tracking method for weight-balanced Dow's code, in the third step, the Sum of the sums SumMiddle phaseIs calculated by：
SumMiddle phase＝B1·(+1)+B2·(-1)+B3·(+1)+B4·(-1)+……+Bn-1·(+1)+Bn·(-1)。
In the above method for tracking mixed data conversion of weight-balanced douceros code, in the fourth step, the calculation method of the loop phase discrimination result D is as follows:
D＝arctan(Summiddle phase/SumIn phase)。
In the aforementioned hybrid data conversion tracking method for weight-balanced ashorts codes, in the step eight, a specific method for unifying code phases of C2-C6 code sequences is as follows: under the tracking code clock, the code phases of the C2-C6 code sequences are respectively integrated, and the maximum integrated value is selected as the unified code phase of the C2-C6 code sequences.
In the above hybrid data conversion tracking method for weight-balanced Dow-Walsh codes, in the eighth step, when the incompletely synchronized pseudo-code sequences are synthesized, the C1-C6 code sequences are synthesized according to the synthesis formula of T4B/T2B.
In the above mixed data conversion tracking method for the weight balance Dow-Chi code, the mixed data conversion tracking method realizes that the T2B regenerated pseudo code realizes quick acquisition and tracking under the condition of input power of-140 dBm, the phase discrimination error is reduced by 3.5dB, and the ranging jitter is reduced by 3 dB.
Compared with the prior art, the invention has the beneficial effects that:
(1) when the tracking state is in an unlocked state during code clock tracking, the phase discrimination method uses the C1 code sequence to simultaneously discriminate the phase with the related integral input loop of the in-phase branch and the middle-phase branch; when the tracking state is in a pre-locking state during code clock tracking, using an incompletely synchronous pseudo code sequence to simultaneously discriminate with the relevant integral input loops of the in-phase branch circuit and the middle-phase branch circuit; the conversion tracking of the mixed data is realized, and the high-precision and high-sensitivity signal regeneration of the weight balance Douglas codes can be completed according to the method;
(2) the invention provides a method for improving the stability of a pre-locking state by using a C1 code sequence and the correlation integral of an in-phase branch and a middle-phase branch in an initial state, thereby accelerating the convergence speed of a loop and improving the stability of the pre-locking state;
(3) the invention provides a method for using a pseudo code sequence to replace a C1 code sequence and related integrals of an in-phase branch and a middle-phase branch in a locking state, and introducing the related integrals of the in-phase branch into a tracking loop to assist in phase discrimination, thereby reducing the phase discrimination error of the loop, increasing the stability of the loop and reducing the jitter of the loop.
Drawings
FIG. 1 is a flow chart of hybrid data transformation tracking according to the present invention.
Detailed Description
The invention is further illustrated by the following examples.
The invention provides a mixed data conversion tracking method aiming at weight balance Dow's codes, which can greatly improve the tracking performance of a regenerated pseudo code loop, thereby effectively improving the ranging precision under deep space and low signal-to-noise ratio, greatly reducing ranging jitter and simultaneously enhancing the ranging reliability. The invention can be suitable for the environment with bad signal-to-noise ratio, the complex electromagnetic compatibility environment, the electrostatic discharge environment and the random interference environment, and is also suitable for the complex space environment.
The hybrid data conversion tracking method, as shown in fig. 1, specifically includes the following steps:
step one, receiving a pseudo code ranging signal transmitted from the outside; setting 2 states of a reference sequence, namely a State1 State and a State2 State; when the tracking loop is in an unlocked State, selecting the State1 State for the reference sequence; in the State1 State, the reference sequence adopts a C1 code sequence in weight balance Dow code; the code sequence of C1 is +1, -1, +1, -1, … …, +1, -1. In State2 State, the reference sequence employs a not fully synchronized pseudo-code sequence. The pseudo-code sequence is a synthetic sequence of weight balancing the C1 code sequence to the C6 code sequence in the stoichio stolonifera code.
Step two, carrying out correlation integration on each chip in the pseudo code ranging signal in sequence according to the in-phase clock to obtain an in-phase integral value A of each chipi(ii) a Sequentially carrying out correlation integration on each chip in the pseudo code ranging signal according to the middle phase clock to obtain a middle phase integral value B of each chipi(ii) a Ranging with i as pseudo codeThe sequence number of each chip in the signal.
Step three, integrating the in-phase value A of each chipiPerforming correlation calculation with the reference sequence of State1 State to obtain in-phase Sum value SumIn phase(ii) a The middle phase integral value B of each chipiPerforming correlation calculation with the reference sequence of State1 State to obtain a Sum of the phases SumMiddle phase(ii) a Since the reference sequence of State1 State is C1 code sequence at this time, Sum of same phase is SumIn phaseThe calculation method comprises the following steps:
Sumin phase＝A1·(+1)+A2·(-1)+A3·(+1)+A4·(-1)+……+An-1·(+1)+An·(-1)
Wherein n is the total number of chips of the pseudo code ranging signal.
Sum of the phases SumMiddle phaseThe calculation method comprises the following steps:
Summiddle phase＝B1·(+1)+B2·(-1)+B3·(+1)+B4·(-1)+……+Bn-1·(+1)+Bn·(-1)。
Step four, the same phase Sum value Sum is pairedIn phaseSum of the Sum phaseMiddle phasePerforming loop phase discrimination to obtain a loop phase discrimination result D; the calculation method of the loop phase discrimination result D comprises the following steps:
D＝arctan(Summiddle phase/SumIn phase)。
And step five, inputting the loop phase discrimination result D into a loop filter and outputting a frequency control word.
Modulating the phase of a reference sequence in the State1 State according to the frequency control word; i.e. the phase of the C1 code sequence is modulated according to the frequency control word.
And step seven, repeating the step three to the step six until the tracking loop reaches a preset locking threshold, and at the moment, the tracking loop enters a pre-locking state.
Step eight, after entering a pre-locking state, respectively searching code phases of C2-C6 code sequences in the weight balance Dow's code; unifying code phases of the C2-C6 code sequence; the specific method for unifying the code phases of the C2-C6 code sequences is as follows: under the tracking code clock, the code phases of the C2-C6 code sequences are respectively integrated, and the maximum integrated value is selected as the unified code phase of the C2-C6 code sequences. Synthesizing the C1-C6 code sequence to obtain an incompletely synchronous pseudo-code sequence; when the incompletely synchronized pseudo-code sequences are synthesized, the C1-C6 code sequences are synthesized according to the synthesis formula of T4B/T2B.
And step nine, after the incompletely synchronized pseudo-code sequence is obtained, switching the reference sequence to a State2 State.
Step ten, repeating the step three to the step six until the incompletely synchronized pseudo code sequence is gradually adjusted into a completely synchronized pseudo code sequence under the loop traction; meanwhile, the tracking loop reaches a locking threshold, a regenerated pseudo code sequence is output, mixed data conversion tracking is completed, and high-precision and high-sensitivity signal regeneration of the weight balance Douglas Waals code is completed.
Example (b):
in the development process of a certain parameterized baseband processing chip adopting a hybrid data conversion tracking method, after the method is applied, the T2B regenerated pseudo code is realized under the input power of-140 dBm, the rapid acquisition tracking is realized, the phase discrimination error is reduced by 3.5dB, and the ranging jitter is reduced by 3 dB.
When the tracking state is in an unlocked state during code clock tracking, the phase discrimination method uses the C1 code sequence to simultaneously discriminate the phase with the related integral input loop of the in-phase branch and the middle-phase branch; when the tracking state is in a pre-locking state during code clock tracking, using an incompletely synchronous pseudo code sequence to simultaneously discriminate with the relevant integral input loops of the in-phase branch circuit and the middle-phase branch circuit; the C1 code sequence and the in-phase and middle-phase branches are used for correlation integration in the initial state, so that the loop convergence speed is increased, and the stability of the pre-locking state is improved; the pseudo code sequence is used for replacing the correlation integral of the C1 code sequence and the in-phase and middle-phase branches in the locking state, and the correlation integral of the in-phase branch is introduced into the tracking loop to assist in phase discrimination, so that the phase discrimination error of the loop is reduced, the stability of the loop is increased, and the jitter of the loop is reduced.
Although the present invention has been described with reference to the preferred embodiments, it is not intended to limit the present invention, and those skilled in the art can make variations and modifications of the present invention without departing from the spirit and scope of the present invention by using the methods and technical contents disclosed above.
Claims (10)
1. A mixed data conversion tracking method aiming at weight balance Dow's codes is characterized in that: the method comprises the following steps:
step one, receiving a pseudo code ranging signal transmitted from the outside; setting 2 states of a reference sequence, namely a State1 State and a State2 State; when the tracking loop is in an unlocked State, selecting the State1 State for the reference sequence;
step two, carrying out correlation integration on each chip in the pseudo code ranging signal in sequence according to the in-phase clock to obtain an in-phase integral value A of each chipi(ii) a Sequentially carrying out correlation integration on each chip in the pseudo code ranging signal according to the middle phase clock to obtain a middle phase integral value B of each chipi(ii) a i is the serial number of each code piece in the pseudo code ranging signal;
step three, integrating the in-phase value A of each chipiPerforming correlation calculation with the reference sequence of State1 State to obtain in-phase Sum value SumIn phase(ii) a The middle phase integral value B of each chipiPerforming correlation calculation with the reference sequence of State1 State to obtain a Sum of the phases SumMiddle phase；
Step four, the same phase Sum value Sum is pairedIn phaseSum of the Sum phaseMiddle phasePerforming loop phase discrimination to obtain a loop phase discrimination result D;
inputting a loop phase discrimination result D into a loop filter, and outputting a frequency control word;
modulating the phase of a reference sequence in the State1 State according to the frequency control word;
step seven, repeating the step three to the step six until the tracking loop reaches a preset locking threshold, and at the moment, the tracking loop enters a pre-locking state;
step eight, after entering a pre-locking state, respectively searching code phases of C2-C6 code sequences in the weight balance Dow's code; unifying code phases of the C2-C6 code sequence; synthesizing the C1-C6 code sequence to obtain an incompletely synchronous pseudo-code sequence;
step nine, after the incompletely synchronous pseudo-code sequence is obtained, switching the reference sequence to a State2 State;
step ten, repeating the step three to the step six until the incompletely synchronized pseudo code sequence is gradually adjusted into a completely synchronized pseudo code sequence under the loop traction; meanwhile, the tracking loop reaches a locking threshold, a regenerated pseudo code sequence is output, mixed data conversion tracking is completed, and high-precision and high-sensitivity signal regeneration of the weight balance Douglas Waals code is completed.
2. The hybrid data transition tracking method for weight balanced Dow-Walsh codes as claimed in claim 1, wherein: in the first step, in the State1 State, the reference sequence adopts a C1 code sequence in weight balance Dow's code; the code sequence of C1 is +1, -1, +1, -1, … …, +1, -1.
3. The hybrid data transition tracking method for weight balanced Dow-Walsh codes as claimed in claim 2, wherein: in State2 State, the reference sequence employs a not fully synchronized pseudo-code sequence.
4. The hybrid data transition tracking method for weight balanced Dow-Walsh codes as claimed in claim 3, wherein: the pseudo code sequence is a synthetic sequence of a C1 code sequence to a C6 code sequence in the weight balance Dow's code.
5. The hybrid data transition tracking method for weight balanced Dow-Walsh codes as claimed in claim 2, wherein: in step three, since the reference sequence of State1 State is the C1 code sequence, the Sum of the same phase is SumIn phaseThe calculation method comprises the following steps:
Sumin phase＝A1·(+1)+A2·(-1)+A3·(+1)+A4·(-1)+……+An-1·(+1)+An·(-1)
Wherein n is the total number of chips of the pseudo code ranging signal.
6. The hybrid data transition tracking method for weight balanced Dow-Walsh codes as claimed in claim 5, wherein: in the third step, the Sum of the phases is SumMiddle phaseThe calculation method comprises the following steps:
Summiddle phase＝B1·(+1)+B2·(-1)+B3·(+1)+B4·(-1)+……+Bn-1·(+1)+Bn·(-1)。
7. The hybrid data transition tracking method for weight balanced Dow-Walsh codes as claimed in claim 1, wherein: in the fourth step, the calculation method of the loop phase discrimination result D comprises the following steps:
D＝arctan(Summiddle phase/SumIn phase)。
8. The hybrid data transition tracking method for weight balanced Dow-Walsh codes as claimed in claim 1, wherein: in the step eight, the specific method for unifying the code phases of the C2-C6 code sequences is as follows: under the tracking code clock, the code phases of the C2-C6 code sequences are respectively integrated, and the maximum integrated value is selected as the unified code phase of the C2-C6 code sequences.
9. The hybrid data transition tracking method for weight balanced Dow-Walsh codes as claimed in claim 8, wherein: in the eighth step, when the pseudo code sequence is not synthesized completely synchronously, the code sequences C1-C6 are synthesized according to the synthesis formula T4B/T2B.
10. A hybrid data transition tracking method for weight balanced ashews codes as claimed in one of claims 1-9, wherein: the hybrid data conversion tracking method realizes that the T2B regenerated pseudo code realizes quick acquisition tracking, the phase discrimination error is reduced by 3.5dB, and the ranging jitter is reduced by 3dB under the condition of input power of-140 dBm.
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