Data processing method and system for distance zero value in integrated measurement, control and data transmission system

Abstract

The present invention provides a data processing method for distance zero value under the integrated measurement, control and data transmission system, which belongs to the field of satellite measurement, control and communication. The steps are as follows: S1: Use an uplink high code rate modulation module to generate a simulated downlink high code rate signal; clear the main channel cycle frame count in the data transmission frame structure; configure the downlink demodulation module to zero calibration mode, determine the uplink frame phase input source of the receiver; trigger the reset second pulse to stop the output of the uplink measurement and uplink data transmission signal; S2: output the uplink measurement and uplink data transmission signal at the same time; S3: The downlink demodulation module receives the downlink data transmission signal and demodulates and synchronizes the frame, samples the uplink frame phase, and obtains pseudo-range information; S4: calculates the ground sampling frame phase difference; S5: corrects the ground sampling frame phase difference; S6: resolves the distance zero value. The present invention uses an analog source to generate an analog downlink high code rate signal, which solves the problem that the distance zero value is difficult to calibrate due to the asymmetry of the uplink and downlink modulation system in the integrated measurement, control and data transmission system.

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 in a measurement, control and data transmission integrated system. Background Art

[0002] As the number of satellites in orbit continues to grow in my country, the need for measurement and control equipment to simultaneously manage multiple satellites is becoming increasingly urgent. The existing measurement and control model for ground-based equipment is no longer sufficient. Therefore, in recent years, to meet the trend toward high-rate data transmission for spacecraft, an integrated measurement, control, and data transmission system has been proposed, based on the incoherent spread spectrum measurement system. This system utilizes the principle of incoherent measurement, utilizing uplink spread spectrum measurement signals and downlink data transmission signals to perform spacecraft measurement and high-rate data transmission, thus unifying measurement and control with data transmission.

[0003] The uplink of the integrated measurement, control and data transmission system uses a non-coherent spread spectrum measurement signal with a PCM-CDMA-BPSK modulation system, and the downlink uses the AOS data transmission frame format recommended by CCSDS with a PCM-BPSK modulation system. Due to the asymmetry of the uplink and downlink modulation systems, a loop cannot be directly formed 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] Publication number CN107797098A 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 based on 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; based on 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 to make the transmission delay of the ground station equipment exactly equal, and the zero value separation of the transponder is achieved by using a zero-calibration frequency converter, solving the problem that the zero value of the transponder distance cannot be directly separated when the uplink and downlink radio frequency characteristics are different. However, the method still has the following problems: it needs to switch between mission mode and calibration mode to determine the distance zero value of the integrated transponder, which is complicated to operate; it does not take into account the frame phase delay deviation between the spread spectrum signal and the digital transmission signal in actual situations, which may lead to inaccurate solution results. Summary of the Invention

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

[0006] To solve the above technical problems, the present invention provides the following technical solution: a data processing method for distance zero value in an 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] Configure the downlink demodulation module to zero calibration mode to determine the input source of the uplink frame phase of the receiver;

[0010] Trigger the reset pulses of the uplink measurement modulation module and the uplink high code rate modulation module respectively, and stop outputting the uplink measurement signal and the uplink data transmission signal;

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

[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 recovered 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: Correct 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 for measurement and control equipment calibration.

[0016] The present invention uses an uplink high code rate modulation module as an analog source to generate an analog downlink high code rate signal before triggering the start second pulse of the uplink measurement modulation module and the uplink high code rate modulation module, so that the modulation systems of the uplink and downlink links are symmetrical; it also clears the main channel cyclic frame count in the frame structure of the data transmission frame to ensure that the main channel cyclic 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: Where SymCnt is the symbol count per frame in 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: 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-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.

[0026] Preferably, 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.

[0027] Corresponding to the above method, the present invention also provides a data processing system for distance zero value in an 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, pseudorange information acquisition module, ground sampling frame phase difference acquisition module, ground sampling frame phase difference correction module and distance zero value 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, then clear the main channel cycle frame count within the frame structure of the data transmission frame, 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, so that the uplink measurement signal and the uplink data transmission signal stop being output;

[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 simultaneously output the uplink measurement signal and the uplink data transmission signal;

[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 for calibration of 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 the uplink high-code rate module and the downlink high-code rate module to form a loop. When obtaining the zero distance value, there is no need to switch between the mission mode and the calibration mode. The calculation can be performed directly in the calibration mode. The operation is simple and can solve the zero distance calibration problem caused by the asymmetry of the uplink and downlink links of the integrated measurement, control and digital transmission 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, easy to implement, and occupies less FPGA resources.

[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 for 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 Example 1 of the present invention;

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

[0042] Figure 3 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] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0044] Example 1

[0045] like Figure 1 The flowchart of this embodiment is shown in FIG. This embodiment provides a method for processing data from zero value in an integrated measurement, control and data transmission system, and the specific steps are as follows:

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

[0047] S101: Using an uplink high bit rate modulation module as an analog source to generate a downlink PCM-BPSK signal, also known as an uplink data transmission signal, also known as an analog downlink high bit rate signal;

[0048] S102: Clearing the main channel cyclic frame count in the frame structure of the data transmission frame to ensure that the main channel cyclic 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 synchronization word Leading head Insert and data fields CRC

[0051] In the data transmission frame structure, W1 to W1020 represent 1020 words, where each word 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 the 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 the uplink data transmission frame phase and the 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 pulses of the uplink measurement modulation module and the uplink high code rate modulation module respectively, and stopping the output of the uplink measurement signal and the uplink data transmission signal.

[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 transmitted frame phase information and received frame phase information, wherein the transmitted frame phase is also called uplink frame phase and the received frame phase is also called 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 to a value in Tchip (unit: ms). The conversion formula is as follows:

[0066] Where SymCnt is the symbol count per frame in 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 is 10, and the bit width of the chip phase M is 16. In this case, the conversion formula is:

[0068] S402: Convert the downlink frame phase to a value in units of Tsym (unit: ms). 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 is FrameLen=(8160+4)*3+96=24588 bits;

[0071] S403: Calculate the ground sampling frame phase difference based on the converted transmission frame phase (uplink frame phase) and the received frame phase (downlink frame phase). The calculation formula is: 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 Where f represents the frequency frame of the uplink measurement signal;

[0072] In this embodiment, f=2Hz / 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 ), which means that 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 , otherwise ΔT=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 the 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, as shown in Figure 1. Figure 3 shown.

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

[0075] S501: The specific calculation formula for 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 AIndicates 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. Ensuring 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 -T au2 =4(T sym -T chip );

[0077] S502: Calculate the corrected ground sampling 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.

[0078] Step 6: Calculate the zero distance value R for 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 is calibrating the distance zero value, 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 utilizes an uplink high-code-rate modulation module as an analog source to resolve the distance zero value calibration problem caused by the asymmetry of the uplink and downlink modulation systems of the integrated measurement, control, and data 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 data transmission signal is used to extract the sampling value of the downlink to the uplink frame. Through simple mathematical conversion processing and taking into account the actual situation to correct the signal processing delay, 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 zero-distance value in a measurement, control, and data transmission integrated 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 zero-distance value acquisition module;

[0084] The preset 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 to 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 output.

[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 transmitted frame phase information and 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 value 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 value, 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] Where SymCnt is the symbol count per frame in 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 reception frame phase (downlink frame phase). The calculation formula is: 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 between 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 values ​​in an integrated measurement, control, and data transmission system of this embodiment first uses a preset module to perform preliminary work on distance zero value calculation to ensure accuracy. An uplink high-code-rate modulation module is used as an analog source to generate an uplink data transmission signal, solving the distance zero value calibration problem of the integrated system caused by asymmetric uplink and downlink modulation systems. Then, an output module is used to simultaneously output an uplink measurement signal and an uplink data transmission signal. A downlink demodulation module receives the downlink data transmission signal returned by the zeroing frequency converter and performs demodulation and frame synchronization processing. Then, a pseudorange information acquisition module is used to sample the uplink frame phase to obtain pseudorange information. After obtaining the pseudorange information, a ground sampling frame phase difference acquisition module is used to perform a simple frame phase mathematical conversion on the frame phase included in the pseudorange information to calculate the ground sampling frame phase difference. Then, a ground sampling frame phase difference correction module is used to correct the ground sampling frame phase difference based on actual conditions. Finally, a distance zero value acquisition module is used to calculate 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 they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. 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 various embodiments of the present invention.

Claims

1. A method for processing distance zero value data under an 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; Configure the downlink demodulation module to zero calibration mode to determine the input source of the uplink frame phase of the receiver; Trigger the reset pulses of the uplink measurement modulation module and the uplink high code rate modulation module respectively, and stop outputting the uplink measurement signal and the uplink data transmission signal; S2: Triggers the start second pulse of the uplink measurement modulation module and the uplink high code rate modulation module, and simultaneously outputs the uplink measurement signal and the uplink data transmission signal; 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 recovered 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: Correct 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 for 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, the uplink frame phase and the downlink frame phase are subjected to frame phase conversion processing: The formula for performing frame phase conversion on the uplink frame phase is: ,in SymCnt is the symbol count per frame in the uplink frame phase, PNPrdCnt is the code cycle count, PNChipCnt is the chip count, ChipPhase represents the chip phase, ChipN Indicates the pseudo code rate multiplier, P The bit width representing the chip count, M The bit width representing the chip phase; The formula for performing frame phase conversion on the downlink frame phase is: ,in FrameCnt Indicates the frame count, SymCnt Indicates the symbol count in each frame, SymPhase represents the symbol phase, FrameLen Indicates the frame length after encoding, Q The bit width representing the symbol phase, R sym Indicates the symbol rate.

6. The method for processing distance zero value data in the integrated measurement, control and data transmission system according to claim 5, characterized in that: In step S4, the formula for calculating the ground sampling frame phase difference is: , which means that if the converted uplink frame phase is greater than the converted downlink frame phase, the ground sampling frame phase difference at this time is ,on the contrary ,in f Indicates the frequency frame of the uplink measurement signal.

7. The method for processing distance zero value data in the integrated measurement, control and data transmission system according to claim 1, characterized in that: In step S5, the frame phase delay deviation between the uplink measurement signal and the uplink data transmission signal is: ,in T au1 Indicates the uplink data transmission frame phase, T au2 Indicates the uplink measurement frame phase, L 1 indicates the high bit rate module logic processing pipeline delay, L 2 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 in 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: ,in 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 in the integrated measurement, control and data transmission system according to claim 1, characterized in that: In step S6, the distance zero value calculation formula of the measurement and control equipment calibration is: ,in To calibrate the transmission delay caused by the zero distance of the measurement and control equipment, is the corrected ground sampling frame phase difference, is the on-board sampling information, c The speed of light.

10. A data processing system for distance zero value in an 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, then clear the main channel cycle frame count within the frame structure of the data transmission frame, 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, so that the uplink measurement signal and the uplink data transmission signal stop being output; 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 simultaneously output the uplink measurement signal and the uplink data transmission signal; 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 for calibration of the measurement and control equipment.

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