Distance zero value data processing method and system under measurement, control and data transmission integrated system

Abstract

The invention provides a distance zero value data processing method under a measurement, control and data transmission integrated system, and belongs to the field of satellite measurement, control and communication. The method comprises the following steps: S1, generating an analog downlink high-bit-rate signal by using an uplink high-bit-rate modulation module; performing zero clearing on a main channel cyclic frame count in a data transmission frame structure; configuring a downlink demodulation module into a zero calibration mode, and determining an uplink frame phase input source of the receiver; triggering a reset pulse per second to stop outputting uplink measurement and uplink data transmission signals; s2, outputting uplink measurement and uplink data transmission signals at the same time; s3, a downlink demodulation module receives and demodulates the downlink data transmission signal, carries out frame synchronization, and samples an uplink frame phase to obtain pseudo-range information; s4, calculating a ground sampling frame phase difference value; s5, correcting a ground sampling frame phase difference value; and S6, calculating a distance zero value. According to the method, the analog source is used for generating the analog downlink high-bit-rate signal, and the problem that the distance zero value of a measurement, control and data transmission integrated system is difficult to calibrate due to asymmetry of uplink and downlink modulation systems is solved.

Description

Technical Field

[0001] The present invention relates to the field of satellite measurement, control and communication technology, and in particular to a method and system for processing distance zero value data under a measurement, control and data transmission integrated system. Background Art

[0002] As the number of satellites in orbit in my country continues to increase, the demand for measurement and control equipment to manage multiple satellites at the same time is becoming more and more urgent, and the existing measurement and control working mode of ground equipment will not be able to meet the requirements. Therefore, in recent years, in order to comply with the development trend of high-bitrate data transmission of spacecraft, an integrated measurement and control digital transmission system has been proposed based on the incoherent spread spectrum measurement and control system. This system adopts the principle of incoherent measurement, uses uplink spread spectrum measurement signals and downlink digital transmission signals to complete spacecraft measurement and high-bitrate data transmission, and realizes the unification of measurement and control and data transmission.

[0003] The uplink of the integrated measurement, control and data transmission system adopts a non-coherent spread spectrum measurement signal with a modulation system of PCM-CDMA-BPSK. The downlink adopts the AOS data transmission frame format recommended by CCSDS with a modulation system of PCM-BPSK. Due to the asymmetry of the modulation systems of the uplink and downlink links, a loop cannot be formed directly between the uplink modulation unit and the downlink demodulation unit, making it impossible for ground equipment to perform ranging zero value calibration through traditional methods such as zeroing the frequency converter.

[0004] The publication number is CN107797098A, which discloses a distance zero value calibration method and system based on the integration of measurement, control and digital transmission. The method determines the reset second pulse according to the system clock, the spread spectrum pseudo code frequency of the non-coherent spread spectrum system and the symbol rate after the high-speed transmission frame encoding of the measurement, control and digital transmission integrated system; according to the reset second pulse, the uplink time gate pulse of the non-coherent spread spectrum system and the uplink time gate pulse of the high-speed transmission frame are determined; the uplink time gate pulse of the non-coherent spread spectrum system and the uplink time gate pulse of the high-speed transmission frame are accurately aligned, so that the transmission delay of the ground station equipment is precisely equal, and the zero-calibration frequency converter is used to realize the distance zero value separation of the transponder, which solves the problem that the distance zero value of the transponder cannot be directly separated when the uplink and downlink radio frequency characteristics are different. However, it still has the following problems: it needs to switch between the mission mode and the calibration mode to determine the distance zero value of the integrated transponder, which is complicated to operate; it does not consider the frame phase delay deviation between the spread spectrum signal and the digital transmission signal in actual situations, which may lead to the lack of accuracy of the solution result. Summary of the invention

[0005] The technical problem to be solved by the present invention is how to simply and reliably solve the problem that the ranging zero value cannot be calibrated by traditional methods such as zeroing frequency converter due to the asymmetry of the uplink and downlink modulation systems in the current integrated measurement, control and data transmission system.

[0006] In order to solve the above technical problems, the present invention provides the following technical solutions: a data processing method of distance zero value under the integrated measurement, control and data transmission system, comprising the following steps:

[0007] S1: Use an uplink high code rate modulation module as an analog source to generate an analog downlink high code rate signal, that is, an uplink data transmission signal;

[0008] Clearing the main channel cycle frame count in the frame structure of the data transmission frame;

[0009] The downlink demodulation module is configured to be in a zero calibration mode to determine the input source of the uplink frame phase of the receiver;

[0010] The reset second pulses of the uplink measurement modulation module and the uplink high code rate modulation module are triggered respectively, and the uplink measurement signal and the uplink data transmission signal stop being output;

[0011] S2: triggers the start second pulse of the uplink measurement modulation module and the uplink high code rate modulation module, and outputs the uplink measurement signal and the uplink data transmission signal at the same time;

[0012] S3: The downlink demodulation module receives the downlink digital transmission signal returned by the zero-calibration frequency converter. After the downlink digital transmission signal is demodulated and frame synchronized, the uplink frame phase is sampled using the restored downlink frame synchronization trailing edge to obtain pseudorange information.

[0013] S4: performing frame phase conversion processing on the frame phase included in the pseudorange information, and calculating the ground sampling frame phase difference;

[0014] S5: Correcting the ground sampling frame phase difference according to the frame phase delay deviation between the uplink measurement signal and the uplink data transmission signal;

[0015] S6: Calculate the distance zero value of the measurement and control equipment calibration.

[0016] Before triggering the start second pulse of the uplink measurement modulation module and the uplink high code rate modulation module, the present invention uses an uplink high code rate modulation module as an analog source to generate an analog downlink high code rate signal, so that the modulation systems of the uplink and downlink links are symmetrical; the main channel cycle frame count in the frame structure of the data transmission frame is cleared to zero, and it is determined that the main channel cycle frame count starts from 0 when the uplink data transmission signal is transmitted, so that the downlink demodulation module can sample the uplink frame phase according to the downlink sampling pulse.

[0017] Preferably, in step S1, the uplink data transmission signal is a PCM-BPSK signal.

[0018] Preferably, the uplink frame phase in step S1 includes an uplink measurement frame phase and an uplink data transmission frame phase.

[0019] Preferably, the pseudorange information in step S3 includes transmitted frame phase information and received frame phase information, wherein the transmitted frame phase is also called an uplink frame phase, and the received frame phase is also called a downlink frame phase.

[0020] Preferably, in step S4, frame phase conversion processing is performed on the uplink frame phase and the downlink frame phase:

[0021] The formula for performing frame phase conversion on the uplink frame phase is: Wherein, SymCnt is the symbol count in each frame of the uplink frame phase, PNPrdCnt is the code period count, PNChipCnt is the chip count, ChipPhase represents the chip phase, ChipN represents the pseudo code rate multiplier, P represents the bit width of the chip count, and M represents the bit width of the chip phase;

[0022] The formula for performing frame phase conversion on the downlink frame phase is: Where FrameCnt represents the frame count, SymCnt represents the symbol count in each frame, SymPhase represents the symbol phase, FrameLen represents the encoded frame length, Q represents the bit width of the symbol phase, R sym Indicates the symbol rate.

[0023] Preferably, in step S4, the calculation formula of the ground sampling frame phase difference is: It is expressed as: if the converted uplink frame phase is greater than the converted downlink frame phase, then the ground sampling frame phase difference ΔT = T chip_ft -T sym_bk ,on the contrary Wherein f represents the frequency frame of the uplink measurement signal.

[0024] Preferably, in step S5, the frame phase delay deviation between the uplink measurement signal and the uplink data transmission signal is: T A =T au1 -T au2 =4(T sym -T chip )+(L1-L2)*T s , where T au1 Indicates the uplink data transmission frame phase, T au2 Indicates the uplink measurement frame phase, L1 indicates the high bit rate module logic processing pipeline delay, L2 is the measurement module logic processing pipeline delay, T sym Represents the symbol period, T chip represents the chip period, T s Indicates the system clock period.

[0025] Preferably, in step S5, the formula for correcting the ground sampling frame phase difference is: ΔT2 = ΔT-TA , where ΔT is the ground sampling frame phase difference, T A It is the frame phase delay deviation between the uplink measurement signal and the uplink data transmission signal.

[0026] Preferably, in step S6, the distance zero value calculation formula calibrated by the measurement and control equipment is: Where τ is the transmission delay caused by the zero value of the measurement and control equipment calibration distance, ΔT2 is the corrected ground sampling frame phase difference, ΔT1 is the on-board sampling information, and c is the speed of light.

[0027] Corresponding to the above method, the present invention also provides a data processing system for distance zero value under the integrated measurement, control and data transmission system, comprising the following modules:

[0028] Uplink measurement modulation module, uplink high code rate modulation module, downlink demodulation module, preset module, output module, pseudo-range information acquisition module, ground sampling frame phase difference acquisition module, ground sampling frame phase difference correction module and distance zero acquisition module;

[0029] The presetting module is used to first use an uplink high code rate modulation module as an analog source to generate an analog downlink high code rate signal, that is, an uplink data transmission signal, and then clear the main channel cycle frame count in the frame structure of the data transmission frame, and then configure the downlink demodulation module to a zero calibration mode, determine the input source of the uplink frame phase of the receiver, and finally trigger the reset second pulse of the uplink measurement modulation module and the uplink high code rate modulation module, and the uplink measurement signal and the uplink data transmission signal stop outputting;

[0030] The output module is used to trigger the start second pulse of the uplink measurement modulation module and the uplink high code rate modulation module, and output the uplink measurement signal and the uplink data transmission signal at the same time;

[0031] The downlink demodulation module is used to receive the downlink digital transmission signal returned by the zero-calibration frequency converter, and perform demodulation and frame synchronization processing;

[0032] The module for acquiring pseudorange information is used to sample the uplink frame phase using the recovered downlink frame synchronization trailing edge to acquire pseudorange information;

[0033] The module for obtaining the ground sampling frame phase difference is used to perform frame phase conversion processing on the frame phase included in the pseudorange information and calculate the ground sampling frame phase difference;

[0034] The ground sampling frame phase difference correction module is used to correct the ground sampling frame phase difference according to the frame phase delay deviation of the uplink measurement signal and the uplink digital transmission signal;

[0035] The module for obtaining the distance zero value is used to calculate the distance zero value calibrated by the measurement and control equipment.

[0036] The advantages of the present invention are:

[0037] (1) An uplink high code rate modulation module is used as the simulation source instead of an uplink high code rate module and a downlink high code rate module to form a loop. When obtaining the distance zero value, there is no need to switch between the mission mode and the calibration mode. The calculation can be done directly in the calibration mode. The operation is simple and can solve the distance zero value calibration problem caused by the asymmetry of the uplink and downlink links of the measurement, control and digital transmission integrated system.

[0038] (2) By simultaneously outputting the uplink measurement signal and the uplink data transmission signal, the sampling value of the downlink to the uplink frame is extracted. Finally, through simple mathematical conversion processing, considering the frame phase delay deviation between the uplink measurement signal and the uplink data transmission signal in actual situations, the signal processing delay correction is performed, and the distance zero value of the measurement and control equipment can be accurately calculated. The accuracy is reliable and easy to implement, and less FPGA resources are occupied;

[0039] (3) There is no need to calculate different zero distance values ​​under different pseudo code rate and high code rate combinations and then calibrate each combination. The accurate zero distance values ​​under various combinations can be directly calculated according to the calculation formula. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 This is a flow chart of Embodiment 1 of the present invention;

[0041] Figure 2 Schematic diagram of frame phases of an ideal uplink measurement signal and an uplink data transmission signal in Embodiment 1 of the present invention;

[0042] Figure 3 It is a schematic diagram of the frame phase of an actual uplink measurement signal and an uplink data transmission signal in Embodiment 1 of the present invention. DETAILED DESCRIPTION

[0043] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in combination with the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0044] Example 1

[0045] like Figure 1 This embodiment provides a method for processing data of distance zero value under the integrated measurement, control and data transmission system, and the specific steps are as follows:

[0046] Step 1: Perform pre-settings, including the following steps:

[0047] S101: using an uplink high code rate modulation module as an analog source to generate a downlink PCM-BPSK signal, that is, an uplink digital transmission signal, which can also be called an analog downlink high code rate signal;

[0048] S102: clearing the main channel cycle frame count in the frame structure of the data transmission frame to ensure that the main channel cycle frame count starts from 0 when the uplink data transmission signal is transmitted, so that the downlink demodulation module can sample the uplink frame phase according to the downlink measurement sampling pulse;

[0049] In this embodiment, the data transmission frame structure of 1 / 3 Turbo channel coding is shown in the following table:

[0050] 96bit W1~W2 W9~W1018 W1019~W1020 Frame Sync Word Leading head Insert and data fields CRC

[0051] In the data transmission frame structure, W1 to W1020 represent 1020 words, each of which has 10 bits.

[0052] S103: configuring the downlink demodulation module to a zero calibration mode to determine an input source of an uplink frame phase of a receiver;

[0053] The downlink demodulation module is composed of a capture and tracking unit, a demodulation and decoding unit, a frame synchronization unit and a ranging information generation unit;

[0054] The input source of the uplink frame phase of the receiver is divided into an uplink data transmission frame phase and an uplink measurement frame phase. In this embodiment, the input source of the uplink frame phase of the downlink demodulation module selects the uplink measurement frame phase;

[0055] The uplink measurement frame phase is defined as the distance between the frame phase of the uplink measurement baseband output signal and the frame header of the uplink measurement frame at a certain moment. The difference between the two is the physical layer delay generated by the signal.

[0056] S104: triggering the reset second pulses of the uplink measurement modulation module and the uplink high code rate modulation module respectively, and the uplink measurement signal and the uplink data transmission signal stop being output.

[0057] Step 2: Trigger the start second pulse of the uplink measurement modulation module and the uplink high code rate modulation module, and output the uplink measurement signal and the uplink data transmission signal at the same time. It is assumed that the uplink measurement signal and the uplink data transmission signal have exactly the same signal transmission delay. The purpose of outputting the uplink measurement signal is to generate an uplink measurement frame phase signal.

[0058] Step 3: The downlink demodulation module receives the downlink digital transmission signal returned by the zero-calibration frequency converter, demodulates the downlink digital transmission signal, performs frame synchronization processing, and uses the recovered downlink frame synchronization trailing edge to sample the uplink frame phase to obtain pseudorange information;

[0059] The pseudorange information includes the transmitted frame phase information and the received frame phase information, wherein the transmitted frame phase is also called the uplink frame phase, and the received frame phase is also called the downlink frame phase;

[0060] In this embodiment, the uplink frame phase format is shown in the following table:

[0061] SymCnt PNPrdCnt PNChipCnt ChipPhase Symbol Count Code cycle count Chip Count Chip Phase

[0062] The downlink frame phase format is shown in the following table:

[0063] FrameCnt SymCnt SymPhase Frame Count Symbol Count Symbol Phase

[0064] Step 4: Perform frame phase conversion processing on the frame phase included in the pseudorange information and calculate the ground sampling frame phase difference, specifically:

[0065] S401: Convert the uplink frame phase into a value in Tchip (unit: ms). The conversion formula is as follows:

[0066] Wherein, SymCnt is the symbol count in each frame of the uplink frame phase, PNPrdCnt is the code period count, PNChipCnt is the chip count, ChipPhase represents the chip phase, ChipN represents the pseudo code rate multiplier, P represents the bit width of the chip count, and M represents the bit width of the chip phase;

[0067] In this embodiment, the bit width of the chip count P=10, and the bit width of the chip phase M=16. At this time, the conversion formula is:

[0068] S402: Convert the downlink frame phase into a value in units of Tsym (unit: ms), and the conversion formula is as follows:

[0069] Where FrameCnt represents the frame count, SymCnt represents the symbol count in each frame, SymPhase represents the symbol phase, FrameLen represents the encoded frame length, N represents the bit width of the symbol phase, R sym Indicates the symbol rate;

[0070] In this embodiment, the bit width Q of the symbol phase is set to 14, and the conversion formula at this time is: In this embodiment, the frame length after 1 / 3 Turbo encoding FrameLen=(8160+4)*3+96=24588 bits;

[0071] S403: Calculate the ground sampling frame phase difference according to the converted transmission frame phase (uplink frame phase) and the reception frame phase (downlink frame phase), and the calculation formula is: It is expressed as: if the converted uplink frame phase is greater than the converted downlink frame phase, then the ground sampling frame phase difference ΔT = T chip_ft -T sym_bk ,on the contrary Wherein f represents the frequency frame of the uplink measurement signal;

[0072] In this embodiment, f=2 Hz / s, that is, the ground sampling frame phase difference calculation formula is: ΔT=(T chip_ft >T sym_bk )? (T chip_ft -T sym_bk );(T chip_ft +500-T sym_bk ).

[0073] like Figure 2 As shown in Figure 1, in an ideal state, there is no delay deviation between the uplink measurement frame phase and the uplink data transmission frame phase. However, in actual situations, due to the different signal processing delays of spread spectrum modulation and non-spread spectrum modulation units, there will be a delay deviation between the uplink measurement signal and the uplink data transmission signal in actual transmission, such as Figure 3 shown.

[0074] Step 5: According to the frame phase delay deviation between the uplink measurement signal and the uplink data transmission signal, correct the ground sampling frame phase difference. The specific process is as follows:

[0075] S501: The specific calculation formula for the delay deviation is: T A =T au1 -T au2 =4(T sym -T chip )+(L1-L2)*T s , where T au1 Indicates the uplink data transmission frame phase, T au2 Indicates the uplink measurement frame phase, L1 indicates the high bit rate module logic processing pipeline delay, L2 is the measurement module logic processing pipeline delay, T sym Represents the symbol period, T chip represents the chip period, T s Represents the system clock period, T A Indicates the delay time of the high code rate signal (uplink data transmission signal) relative to the spread spectrum signal (uplink measurement signal);

[0076] In this embodiment, the baseband export data of the high bit rate module and the measurement module are sampled simultaneously, and the positions of the frame headers in the two waveforms are compared in Matlab. A certain sampling depth can improve the accuracy of delay detection. It is measured that L1=L2=22. Therefore, the specific delay deviation T in this embodiment is A =T au1 -Tau2 =4(T sym -T chip );

[0077] S502: Calculate the corrected ground sampling phase difference value, the calculation formula is: ΔT2 = ΔT-T A , where ΔT is the ground sampling frame phase difference, T A It is the frame phase delay deviation between the uplink measurement signal and the uplink data transmission signal.

[0078] Step 6: Calculate the zero distance value R for the measurement and control equipment calibration zero , the calculation formula is: Where τ is the transmission delay caused by the zero value of the measurement and control equipment calibration distance, ΔT2 is the corrected ground sampling frame phase difference, ΔT1 is the on-board sampling information, and c is the speed of light;

[0079] In this embodiment, when the measurement and control equipment performs distance zero value calibration, there is no satellite sampling information, so ΔT1=0 is processed, and the distance zero value calibrated by the measurement and control equipment is

[0080] In this embodiment, the frame phase conversion of steps 4-6 and the subsequent solution process are placed in the embedded data processing software to reduce the use of FPGA resources.

[0081] This embodiment uses an uplink high code rate modulation module as an analog source to solve the distance zero value calibration problem caused by the asymmetry of the uplink and downlink modulation systems of the integrated measurement, control and digital transmission system; based on the assumption that the non-coherent spread spectrum measurement signal and the data transmission frame signal have the same signal transmission delay, a method of simultaneously outputting the uplink measurement signal and the uplink digital transmission signal is used to extract the sampling value of the downlink to the uplink frame, and through simple mathematical conversion processing, the signal processing delay is corrected taking into account the actual situation, so that the calculated distance zero value is accurate and reliable.

[0082] Example 2

[0083] Corresponding to Example 1, this embodiment provides a data processing system for distance zero value under the integrated measurement, control and data transmission system, including an uplink measurement modulation module, an uplink high code rate modulation module, a downlink demodulation module, a preset module, an output module, a pseudorange information acquisition module, a ground sampling frame phase difference acquisition module, a ground sampling frame phase difference correction module and a distance zero value acquisition module;

[0084] The pre-setting module is used to first use an uplink high code rate modulation module as an analog source to generate an analog downlink high code rate signal, that is, an uplink data transmission signal, and then clear the main channel cycle frame count in the frame structure of the data transmission frame, and then configure the downlink demodulation module to the zero calibration mode, determine the input source of the uplink frame phase of the receiver, and finally trigger the reset second pulse of the uplink measurement modulation module and the uplink high code rate modulation module, and the uplink measurement signal and the uplink data transmission signal stop outputting.

[0085] The output module is used to trigger the start second pulse of the uplink measurement modulation module and the uplink high code rate modulation module, and output the uplink measurement signal and the uplink data transmission signal at the same time.

[0086] The downlink demodulation module is used to receive the downlink digital transmission signal returned by the zero-calibration frequency converter, and perform demodulation and frame synchronization processing.

[0087] The module for acquiring pseudorange information is used to sample the uplink frame phase using the recovered downlink frame synchronization trailing edge to acquire pseudorange information; the pseudorange information includes the transmitted frame phase information and the received frame phase information, wherein the transmitted frame phase is the uplink frame phase and the received frame phase is the downlink frame phase.

[0088] The module for obtaining the ground sampling frame phase difference is used to perform frame phase conversion processing on the frame phase included in the pseudorange information and calculate the ground sampling frame phase difference, and specifically includes the following units:

[0089] Uplink frame phase conversion unit: used to convert the uplink frame phase into a value in Tchip (unit: ms). The conversion formula is as follows:

[0090] Wherein, SymCnt is the symbol count in each frame of the uplink frame phase, PNPrdCnt is the code period count, PNChipCnt is the chip count, ChipPhase represents the chip phase, ChipN represents the pseudo code rate multiplier, P represents the bit width of the chip count, and M represents the bit width of the chip phase;

[0091] Downlink frame phase conversion unit: used to convert the downlink frame phase into a value in Tsym (unit: ms). The conversion formula is as follows:

[0092] Where FrameCnt represents the frame count, SymCnt represents the symbol count in each frame, SymPhase represents the symbol phase, FrameLen represents the encoded frame length, N represents the bit width of the symbol phase, R sym Indicates the symbol rate.

[0093] The ground sampling frame phase difference acquisition unit is used to calculate the ground sampling frame phase difference according to the converted transmission frame phase (uplink frame phase) and the receiving frame phase (downlink frame phase). The calculation formula is: It is expressed as: if the converted uplink frame phase is greater than the converted downlink frame phase, then the ground sampling frame phase difference ΔT = T chip_ft -T sym_bk ,on the contrary Wherein f represents the frequency frame of the uplink measurement signal.

[0094] The ground sampling frame phase difference correction module is used to correct the ground sampling frame phase difference according to the frame phase delay deviation of the uplink measurement signal and the uplink data transmission signal, and specifically includes the following units:

[0095] Delay deviation calculation unit: used to calculate the specific delay deviation of the uplink measurement signal and the uplink data transmission signal. The calculation formula is: T A =T au1 -T au2 =4(T sym -T chip )+(L1-L2)*T s , where T au1 Indicates the uplink data transmission frame phase, T au2 Indicates the uplink measurement frame phase, L1 indicates the high bit rate module logic processing pipeline delay, L2 is the measurement module logic processing pipeline delay, T sym Represents the symbol period, T chip represents the chip period, T s Represents the system clock period, T A Indicates the delay time of the high code rate signal (uplink data transmission signal) relative to the spread spectrum signal (uplink measurement signal);

[0096] Calculation unit for corrected ground sampling phase difference: used to calculate the corrected ground sampling phase difference according to the specific delay deviation of the uplink measurement signal and the uplink data transmission signal and the ground sampling frame phase difference. The calculation formula is: ΔT2 = ΔT-T A , where ΔT is the ground sampling frame phase difference, T A It is the frame phase delay deviation between the uplink measurement signal and the uplink data transmission signal.

[0097] The module for obtaining the distance zero value is used to calculate the distance zero value calibrated by the measurement and control equipment. The calculation formula is: Where τ is the transmission delay caused by the zero value of the measurement and control equipment calibration distance, ΔT2 is the corrected ground sampling frame phase difference, ΔT1 is the on-board sampling information, and c is the speed of light.

[0098] The data processing system for distance zero value under the integrated measurement, control and digital transmission system of the present embodiment first uses the preset module to do the preliminary work of solving the distance zero value to ensure the accuracy of the solution, and uses an uplink high code rate modulation module as an analog source to generate an uplink digital transmission signal, which solves the problem of distance zero value calibration of the integrated system caused by the asymmetry of the uplink and downlink modulation systems; then uses the output module to simultaneously output the uplink measurement signal and the uplink digital transmission signal; uses the downlink demodulation module to receive the downlink digital transmission signal returned by the zero calibration converter, and performs demodulation and frame synchronization processing, and then uses the pseudo-range information acquisition module to sample the uplink frame phase to obtain the pseudo-range information; after obtaining the pseudo-range information, uses the ground sampling frame phase difference acquisition module to perform a simple frame phase mathematical conversion processing on the frame phase included in the pseudo-range information, calculates the ground sampling frame phase difference, and then uses the positive ground sampling frame phase difference module to correct the ground sampling frame phase difference in combination with the actual situation, and finally uses the distance zero value acquisition module to solve the distance zero value calibrated by the measurement and control equipment. This system is simple and easy to implement.

[0099] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A data processing method for distance zero value under the integrated measurement, control and data transmission system, characterized in that: The following steps are involved: S1: Use an uplink high code rate modulation module as an analog source to generate an analog downlink high code rate signal, that is, an uplink data transmission signal; Clearing the main channel cycle frame count in the frame structure of the data transmission frame; The downlink demodulation module is configured to be in a zero calibration mode to determine the input source of the uplink frame phase of the receiver; The reset second pulses of the uplink measurement modulation module and the uplink high code rate modulation module are triggered respectively, and the uplink measurement signal and the uplink data transmission signal stop being output; S2: triggers the start second pulse of the uplink measurement modulation module and the uplink high code rate modulation module, and outputs the uplink measurement signal and the uplink data transmission signal at the same time; S3: The downlink demodulation module receives the downlink digital transmission signal returned by the zero-calibration frequency converter. After the downlink digital transmission signal is demodulated and frame synchronized, the uplink frame phase is sampled using the restored downlink frame synchronization trailing edge to obtain pseudorange information. S4: performing frame phase conversion processing on the frame phase included in the pseudorange information, and calculating the ground sampling frame phase difference; S5: Correcting the ground sampling frame phase difference according to the frame phase delay deviation between the uplink measurement signal and the uplink data transmission signal; S6: Calculate the distance zero value of the measurement and control equipment calibration.

2. The method for processing distance zero value data under the integrated measurement, control and data transmission system according to claim 1 is characterized in that: In step S1, the uplink data transmission signal is a PCM-BPSK signal.

3. The method for processing distance zero value data under the integrated measurement, control and data transmission system according to claim 1 is characterized in that: The uplink frame phase in step S1 includes an uplink measurement frame phase and an uplink data transmission frame phase.

4. The method for processing distance zero value data under the integrated measurement, control and data transmission system according to claim 1 is characterized in that: The pseudorange information in step S3 includes transmitted frame phase information and received frame phase information, wherein the transmitted frame phase is also called an uplink frame phase, and the received frame phase is also called a downlink frame phase.

5. The method for processing distance zero value data under the integrated measurement, control and data transmission system according to claim 4 is characterized in that: In step S4, frame phase conversion processing is performed on the uplink frame phase and the downlink frame phase: The formula for performing frame phase conversion on the uplink frame phase is: Wherein, SymCnt is the symbol count in each frame of the uplink frame phase, PNPrdCnt is the code period count, PNChipCnt is the chip count, ChipPhase represents the chip phase, ChipN represents the pseudo code rate multiplier, P represents the bit width of the chip count, and M represents the bit width of the chip phase; The formula for performing frame phase conversion on the downlink frame phase is: Where FrameCnt represents the frame count, SymCnt represents the symbol count in each frame, SymPhase represents the symbol phase, FrameLen represents the encoded frame length, Q represents the bit width of the symbol phase, R sym Indicates the symbol rate.

6. The method for processing distance zero value data under the integrated measurement, control and data transmission system according to claim 1 is characterized in that: In step S4, the formula for calculating the ground sampling frame phase difference is: It is expressed as: if the converted uplink frame phase is greater than the converted downlink frame phase, then the ground sampling frame phase difference ΔT = T chip_ft -T sym_bk ,on the contrary Wherein f represents the frequency frame of the uplink measurement signal.

7. The method for processing distance zero value data under the integrated measurement, control and data transmission system according to claim 1 is characterized in that: In step S5, the frame phase delay deviation between the uplink measurement signal and the uplink data transmission signal is: T A =T au1 -T au2 =4(T sym -T chip )+(L1-L2)*T s , where T au1 Indicates the uplink data transmission frame phase, T au2 Indicates the uplink measurement frame phase, L1 indicates the high bit rate module logic processing pipeline delay, L2 is the measurement module logic processing pipeline delay, T sym Represents the symbol period, T chip represents the chip period, T s Indicates the system clock period.

8. The method for processing distance zero value data under the integrated measurement, control and data transmission system according to claim 7 is characterized in that: In step S5, the formula for correcting the ground sampling frame phase difference is: ΔT2 = ΔT-T A , where ΔT is the ground sampling frame phase difference, T A It is the frame phase delay deviation between the uplink measurement signal and the uplink data transmission signal.

9. The method for processing distance zero value data under the integrated measurement, control and data transmission system according to claim 1 is characterized in that: In step S6, the distance zero value calculation formula of the measurement and control equipment calibration is: Where τ is the transmission delay caused by the zero value of the measurement and control equipment calibration distance, ΔT2 is the corrected ground sampling frame phase difference, ΔT1 is the on-board sampling information, and c is the speed of light.

10. A data processing system for distance zero value under the integrated measurement, control and data transmission system, characterized in that: It includes an uplink measurement modulation module, an uplink high code rate modulation module, a downlink demodulation module, a preset module, an output module, a pseudo-range information acquisition module, a ground sampling frame phase difference acquisition module, a ground sampling frame phase difference correction module and a distance zero value acquisition module; The presetting module is used to first use an uplink high code rate modulation module as an analog source to generate an analog downlink high code rate signal, that is, an uplink data transmission signal, and then clear the main channel cycle frame count in the frame structure of the data transmission frame, and then configure the downlink demodulation module to a zero calibration mode, determine the input source of the uplink frame phase of the receiver, and finally trigger the reset second pulse of the uplink measurement modulation module and the uplink high code rate modulation module, and the uplink measurement signal and the uplink data transmission signal stop outputting; The output module is used to trigger the start second pulse of the uplink measurement modulation module and the uplink high code rate modulation module, and output the uplink measurement signal and the uplink data transmission signal at the same time; The downlink demodulation module is used to receive the downlink digital transmission signal returned by the zero-calibration frequency converter, and perform demodulation and frame synchronization processing; The module for acquiring pseudorange information is used to sample the uplink frame phase using the recovered downlink frame synchronization trailing edge to acquire pseudorange information; The module for obtaining the ground sampling frame phase difference is used to perform frame phase conversion processing on the frame phase included in the pseudorange information and calculate the ground sampling frame phase difference; The ground sampling frame phase difference correction module is used to correct the ground sampling frame phase difference according to the frame phase delay deviation of the uplink measurement signal and the uplink digital transmission signal; The module for obtaining the distance zero value is used to calculate the distance zero value calibrated by the measurement and control equipment.

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