CN107797098B - Distance zero value calibration method and system based on measurement, control and data transmission integration - Google Patents
Distance zero value calibration method and system based on measurement, control and data transmission integration Download PDFInfo
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Abstract
The invention discloses a distance zero value calibration method and a distance zero value calibration system based on measurement, control and data transmission integration, wherein the method comprises the following steps: determining reset second pulse according to a system clock, the frequency of a spread spectrum pseudo code of a non-coherent spread spectrum system and the symbol rate after the high-speed transmission frame coding of a measurement and control data transmission integrated system; determining an uplink time door opening pulse of an incoherent spread spectrum system and an uplink time door opening pulse of a high-speed transmission frame according to the reset second pulse; the method has the advantages that the time door opening pulse of the uplink of the incoherent spread spectrum system and the time door opening pulse of the uplink of the high-speed transmission frame are accurately aligned, so that the transmission time delay of ground station equipment is accurately equal, the distance zero value separation of the transponders is realized by utilizing the zero calibration frequency converter, the problem that the distance zero values of the transponders cannot be directly separated when the uplink and downlink radio frequency characteristics are different is solved, and the task requirements of effectiveness, simplification and reliability of the distance zero value separation method are met.
Description
Technical Field
The invention belongs to the technical field of satellite measurement and control and communication, and particularly relates to a measurement and control data transmission integration-based distance zero value calibration method and system.
Background
The measurement and control data transmission integrated transponder is compatible with two measurement and control systems of incoherent spread spectrum and measurement and control data transmission integration, and the incoherent spread spectrum system and the measurement and control data transmission integration system are reliably switched according to an uplink remote control command and work in a time-sharing mode. The measurement and control data transmission integrated system is mainly used for a measurement and control subsystem to establish reliable and stable remote measurement, remote control, distance measurement and speed measurement and high-speed data transmission links between satellites and the ground.
When the responder works in a measurement and control data transmission integrated system, 1-path remote control and 3-path distance measurement signals transmitted by the ground station are received in an uplink mode, the modulation mode is PCM-DS-BPSK, and the format and the characteristics are the same as those of an incoherent spread spectrum system. The downlink adopts isochronous insertion service according to Advanced Orbital Systems (AOS) protocol, performs framing coding on high-speed data transmission data and ranging and speed measuring information, then adopts special truncation 1/3 or 1/6 channel Turbo coding, performs PCM-BPSK modulation on carrier phase, and transmits the power amplified and out-of-band filtered data to a ground station through a measurement and control antenna.
It can be seen that, in the measurement and control data transmission integrated transponder, the uplink is an incoherent spread spectrum measurement frame, the downlink is a coded high-speed transmission frame, and the uplink and downlink radio frequency modulation characteristics (such as different measurement and control systems, different frequency points, different modulation modes, different symbol rates, different signal bandwidths, and the like) are different, so that the distance zero value of the integrated transponder cannot be directly separated by the traditional methods such as a zero calibration frequency converter and the like.
Disclosure of Invention
The technical problem of the invention is solved: the method and the system for calibrating the distance zero value based on measurement, control and data transmission integration are provided, and the problem that the distance zero values of integrated transponders cannot be directly separated when uplink and downlink radio frequency characteristics are different at present is solved.
In order to solve the technical problem, the invention discloses a distance zero value calibration method based on measurement, control and data transmission integration, which comprises the following steps:
determining reset second pulse according to a system clock, the frequency of a spread spectrum pseudo code of a non-coherent spread spectrum system and the symbol rate after the high-speed transmission frame coding of a measurement and control data transmission integrated system; the system clock, the spread spectrum pseudo code frequency and the symbol rate are respectively integral multiples of the reset second pulse, and the reset second pulse is integral multiples of the incoherent second pulse;
determining an uplink time door opening pulse of an incoherent spread spectrum system and an uplink time door opening pulse of a high-speed transmission frame according to the reset second pulse;
aligning the uplink time gating pulse of the incoherent spread spectrum system with the uplink time gating pulse of the high-speed transmission frame;
respectively determining a distance absolute value in a task mode and a distance absolute value in a calibration mode according to an aligned uplink time door opening pulse of an incoherent spread spectrum system and an uplink time door opening pulse of a high-speed transmission frame;
and determining the distance zero value of the integrated transponder according to the difference value between the distance absolute value in the task mode and the distance absolute value in the calibration mode.
In the above measurement, control, and data transmission integration-based distance zero value calibration method, determining the uplink time gate-on pulse of the incoherent spread spectrum system and the uplink time gate-on pulse of the high-speed transmission frame according to the reset pulse per second includes:
aligning the reset second pulse, the incoherent second pulse and the high-speed frame second pulse to obtain an aligned measurement frame, a spread spectrum pseudo code and a high-speed transmission frame;
and respectively obtaining the uplink time door opening pulse of the incoherent spread spectrum system and the uplink time door opening pulse of the high-speed transmission frame according to the aligned measurement frame, the spread spectrum pseudo code and the high-speed transmission frame.
In the above measurement, control and data transmission integration-based distance zero value calibration method, aligning the reset second pulse, the incoherent second pulse and the high-speed frame second pulse to obtain an aligned measurement frame, a spread spectrum pseudo code and a high-speed transmission frame, including:
resetting the first numerically-controlled oscillator under the incoherent spread spectrum system according to the second pulse to eliminate accumulated time errors caused by control word truncation, so that the initial phase front edge of the 1 st pseudo code period in the incoherent second pulse and the N pseudo code periods and the 1 st information bit front edge of the frame synchronization word of the measurement frame are strictly aligned, and the aligned measurement frame and the spread spectrum pseudo code are obtained;
and resetting the second numerically-controlled oscillator under the measurement and control data transmission integrated system according to the reset second pulse periodicity, eliminating accumulated time errors caused by control word truncation, and strictly aligning the incoherent second pulse, the high-speed frame second pulse and the leading edge of the 1 st bit of the frame head of the 1 st frame of the high-speed transmission frame to obtain the aligned high-speed transmission frame.
In the above distance zero value calibration method based on measurement, control and data transmission integration,
the starting phase of the pseudo code period refers to: measuring the 1 st pseudo code phase of the 1 st code period in N pseudo code periods contained in the 1 st information bit of the frame;
the measurement frame refers to: a data frame appointed for transmitting the measurement information;
the high-speed transmission frame is as follows: and uniformly framing the ranging/speed measuring information and the high-speed data transmission data and encoding the data frames.
In the above measurement, control, and data transmission integration-based distance zero value calibration method, obtaining the uplink time gating pulse of the incoherent spread spectrum system and the uplink time gating pulse of the high-speed transmission frame according to the aligned measurement frame, the spread spectrum pseudo code, and the high-speed transmission frame, respectively, includes:
performing exclusive-or operation on the aligned measurement frame and the spread spectrum pseudo code to obtain a transmission baseband signal, and recording the last 1 information bit trailing edge of a frame synchronization word of the measurement frame before radio frequency modulation as an uplink time gate-opening pulse of the incoherent spread spectrum system;
performing logic processing on the aligned high-speed transmission frames to be used as a transmission baseband signal, and recording the last 1 sign bit back edge of a 1 st frame synchronization head in each 64 transmission frames before radio frequency modulation as an uplink time door opening pulse of the high-speed transmission frames; wherein the logic processing comprises: frame tail check, ping-pong buffer, Turbo coding and data scrambling.
In the above measurement, control and data transmission integration-based distance zero value calibration method, the method further includes:
generating a spread spectrum pseudo code frequency of the incoherent spread spectrum system through a first numerical control oscillator according to the system clock; wherein, the pseudo code frequency of spread spectrum includes: carrying out 1/M frequency division on the frequency of the spread spectrum pseudo code to obtain the periodic frequency of the uplink spread spectrum pseudo code, and carrying out 1/N-time frequency division on the periodic frequency of the uplink spread spectrum pseudo code obtained after 1/M frequency division to obtain the information rate when an uplink measurement frame is framed;
generating a symbol rate after coding and encoding of the high-speed transmission frame of the measurement and control data transmission integrated system by a second numerical control oscillator according to the system clock; wherein the symbol rate comprises: the information rate of the transmission frame framing obtained by dividing the symbol rate by 1/3 or 1/6, and the effective byte rate of the transmission frame framing obtained by dividing the information rate of the transmission frame framing obtained by dividing the transmission frame framing obtained by 1/3 or 1/6 by 1/8.
In the above measurement, control, and data transmission integration-based distance zero value calibration method, the determining, according to the aligned uplink time gate-on pulse of the incoherent spread spectrum system and the uplink time gate-on pulse of the high-speed transmission frame, a distance absolute value in a task mode and a distance absolute value in a calibration mode, respectively, includes:
taking an uplink time door opening pulse of the aligned incoherent spread spectrum system as an initial time, taking the trailing edge of the last 1 sign bit of the frame synchronization head of the 1 st frame in 64 transmission frames demodulated by a downlink as a stopping time, and taking the time delay determined according to the initial time and the stopping time as an absolute value of the distance under a task mode;
and taking the uplink time door opening pulse of the aligned high-speed transmission frame as the starting time, taking the trailing edge of the last 1 sign bit of the 1 st frame synchronization head in each 64 transmission frames demodulated by the downlink as the stopping time, and taking the time delay determined according to the starting time and the stopping time as the absolute value of the distance in the calibration mode.
In the above measurement, control, data and transmission integration-based distance zero value calibration method, determining a distance zero value of an integrated transponder according to a difference between a distance absolute value in a task mode and a distance absolute value in a calibration mode includes:
Rr＝R01-R02+Rb
wherein, R01 represents the absolute value of the distance in the task mode, R02 represents the absolute value of the distance in the calibration mode, Rr represents the distance zero value of the integrated transponder, and Rb represents the time delay of the zero calibration frequency converter calibrated by the logic analyzer.
In the above distance zero value calibration method based on measurement, control and data transmission integration,
the incoherent second pulse is 2Hz for the star.
Correspondingly, the invention also discloses a distance zero value calibration system based on measurement, control and data transmission integration, which comprises:
the first determining module is used for determining reset second pulse according to a system clock, the frequency of a spread spectrum pseudo code of an incoherent spread spectrum system and the symbol rate after the high-speed transmission frame coding of a measurement and control data transmission integrated system; the system clock, the spread spectrum pseudo code frequency and the symbol rate are respectively integral multiples of the reset second pulse, and the reset second pulse is integral multiples of the incoherent second pulse;
the second determining module is used for determining an uplink time door opening pulse of an incoherent spread spectrum system and an uplink time door opening pulse of a high-speed transmission frame according to the reset second pulse;
the alignment module is used for aligning the uplink time gating pulse of the incoherent spread spectrum system with the uplink time gating pulse of the high-speed transmission frame;
a third determining module, configured to determine, according to the aligned uplink time door-opening pulse of the incoherent spread spectrum system and the uplink time door-opening pulse of the high-speed transmission frame, a distance absolute value in the task mode and a distance absolute value in the calibration mode, respectively;
and the fourth determining module is used for determining the distance zero value of the integrated transponder according to the difference value between the distance absolute value in the task mode and the distance absolute value in the calibration mode.
The invention has the following advantages:
the invention discloses a distance zero value calibration method based on measurement and control data transmission integration, which determines reset second pulse according to a system clock, the frequency of a spread spectrum pseudo code of an incoherent spread spectrum system and the symbol rate after coding a high-speed transmission frame of the measurement and control data transmission integration system; determining an uplink time door opening pulse of an incoherent spread spectrum system and an uplink time door opening pulse of a high-speed transmission frame according to the reset second pulse; the method has the advantages that the time door opening pulse of the uplink of the incoherent spread spectrum system and the time door opening pulse of the uplink of the high-speed transmission frame are accurately aligned, so that the transmission time delay of ground station equipment is accurately equal, the distance zero value separation of the transponders is realized by utilizing the zero calibration frequency converter, and the problem that the distance zero values of the transponders cannot be directly separated when the uplink and downlink radio frequency characteristics are different is solved. Therefore, the invention provides a design idea of strict alignment of time door opening pulses of an uplink of a ground station against model backgrounds with different uplink and downlink radio frequency modulation characteristics, provides a realization method for ensuring accurate and equal transmission time delay, can solve the problem that distance zeros of integrated transponders cannot be directly separated when the uplink and downlink radio frequency characteristics are different by only adopting a zero calibration frequency converter, and meets the task requirements of effectiveness, simplification and reliability of the distance zero value separation method.
Drawings
FIG. 1 is a flowchart illustrating steps of a measurement, control and data transmission integration-based distance zero value calibration method according to an embodiment of the present invention;
FIG. 2 is a block diagram of a zero value separation system in an embodiment of the invention;
FIG. 3 is a block diagram of a system for separating zero values during far-field wireless testing according to an embodiment of the present invention;
FIG. 4 is a block diagram of clock domain management according to an embodiment of the present invention;
FIG. 5 is a schematic diagram of clock domains before delay alignment according to an embodiment of the present invention;
fig. 6 is a schematic diagram of a delay-aligned clock domain according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, common embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.
The invention discloses a distance zero value calibration method based on measurement and control data transmission integration, which compares two systems of measurement and control and data transmission, firstly provides a design idea of strict alignment of time door opening pulses of an uplink of a ground station, and provides an implementation method for ensuring accurate and equal transmission time delay. The distance zero value calibration method based on measurement, control and data transmission integration only adopts a zero calibration frequency converter, solves the technical problem of transponder zero value separation with different uplink and downlink radio frequency characteristics, and is mainly used on measurement, control and communication platforms of various orbit satellites.
Wherein:
the measurement and control data transmission integrated system is as follows: the uplink adopts a non-coherent spread spectrum system, the downlink utilizes the same radio frequency link, adopts isochronous insertion service, frames and codes the ranging/speed measurement information and high-speed data transmission unified data, and realizes a novel measurement and control system integrating measurement and control with a data transmission channel. Therefore, the measurement and control data transmission integrated system has basic functions of remote control, remote measurement and the like, also has a downlink high-speed data transmission function, supports ground multi-station distance measurement/speed measurement, and is widely applied to the field of satellite measurement and control. Under the measurement and control data transmission integrated system, because the uplink adopts an incoherent measurement frame and the downlink adopts a high-speed transmission frame, and the radio frequency characteristics of the uplink and the downlink are completely different, the distance zero value separation of the responder can not be directly finished by using traditional methods such as a zero calibration frequency converter and the like.
The ground station needs to have two working modes: a task mode and a calibration mode. The ground station sends an incoherent spread spectrum measurement signal in a task mode, and sends a high-speed transmission frame which is the same as the downlink of the measurement and control data transmission integrated system in a calibration mode.
The incoherent spread spectrum system is as follows: the uplink and downlink signals adopt a measurement and control system of a measurement frame structure, the phase and the rate of uplink and downlink pseudo codes do not need to be coherent, the information transmitted in the measurement frame is ranging information, the uplink measurement frame is only used for resolving range ambiguity, and the downlink measurement frame modulates the measurement information such as pseudo range, Doppler and the like of the transponder.
Referring to fig. 1, a flowchart of steps of a measurement, control and data transmission integration-based distance zero value calibration method in an embodiment of the present invention is shown. In this embodiment, the measurement, control and data transmission integration-based distance zero value calibration method includes:
In this embodiment, the system clock, the spreading pseudo code frequency and the symbol rate are respectively integer multiples of the reset second pulse, and the reset second pulse is an integer multiple of the incoherent second pulse. For example, note: the system clock is fs, the spread spectrum pseudo code frequency is fg, the symbol rate is ft, the reset second pulse is fi, the incoherent second pulse is Clk2pps, then: fs-K1 xfi, ft-K2 xfi, fg-K3 xfi, fi-K4 xclk 2 pps. Wherein, K1, K2, K3 and K4 are natural numbers, in other words, fi can be the greatest common divisor of fs, fg and ft. Preferably, the incoherent second pulse Clk2pps may be 2Hz for star.
In a preferred embodiment of the present invention, the spreading pseudo code frequency fg of the incoherent spreading system may be generated by a first numerically controlled oscillator (denoted as NCO1) according to the system clock. Wherein, the spread spectrum pseudo code frequency fg includes: the period frequency fg1 of the uplink spread spectrum pseudo code obtained by dividing the frequency fg of the spread spectrum pseudo code by 1/M (M can be but not limited to 1023), and the information rate fg2 when framing the uplink measurement frame obtained by dividing the frequency fg1 by 1/N (N can be but not limited to 10). Among them, (Numerically Controlled Oscillator, NCO).
In a preferred embodiment of the present invention, a symbol rate ft (about 3Mbps and about 1Mbps, two shifts in total) after high-speed transmission frame coding can be generated by a second numerically controlled oscillator (denoted as NCO2) according to the system clock. Wherein, the symbol rate ft, includes: an information rate ft1 (about 1Mbps and about 256Kbps) of a transmission frame framing obtained by dividing the symbol rate ft by 1/3 or 1/6, and an effective byte rate ft2 of a transmission frame framing obtained by dividing the symbol rate ft by 1/8.
And step 102, determining an uplink time door opening pulse of an incoherent spread spectrum system and an uplink time door opening pulse of a high-speed transmission frame according to the reset pulse per second.
In this embodiment, one way to determine the uplink time gating pulse of the incoherent spreading system and the uplink time gating pulse of the high-speed transmission frame may be as follows:
and a substep S1, aligning the reset second pulse fi, the incoherent second pulse Clk2pps and the high-speed frame second pulse to obtain an aligned measurement frame, a spread spectrum pseudo code and a high-speed transmission frame.
In this embodiment, the aligned measurement frame and the spreading pseudo code may be obtained as follows:
and resetting the first numerically-controlled oscillator NCO1 under the incoherent spread spectrum system periodically according to the reset second pulse fi, eliminating accumulated time errors caused by control word truncation, strictly aligning the initial phase front edge of the 1 st pseudo code period in the incoherent second pulse Clk2pps, the initial phase front edge of the 1 st pseudo code period in the N pseudo code periods and the 1 st information bit front edge of the frame synchronization word of the measurement frame, and obtaining the aligned measurement frame and the spread spectrum pseudo code.
Preferably, the starting phase of the pseudo code period is: the 1 st pseudo code phase in the 1 st (e.g., 10) code period (e.g., 1023 code length) of the N (e.g., 10) pseudo code periods in the 1 st information bit of the frame is measured. The measurement frame refers to: a data frame agreed for transmission of measurement information. The frame rate of the data frame appointed for transmitting the measurement information may be 2 frames/s, and each frame may be 500 bits long.
In this embodiment, the aligned high-speed transmission frame can be obtained as follows:
and periodically resetting a second numerically controlled oscillator NCO2 under the measurement and control data transmission integrated system according to the reset second pulse fi, eliminating accumulated time errors caused by control word truncation, and strictly aligning the incoherent second pulse Clk2pps, the high-speed frame second pulse and the leading edge of the 1 st bit of the frame head of the 1 st frame of the high-speed transmission frame to obtain the aligned high-speed transmission frame.
Preferably, the high-speed transmission frame is: and uniformly framing the ranging/speed measuring information and the high-speed data transmission data and encoding the data frames. The high-speed frame second pulse means: under a measurement and control data transmission integrated system, for example, the rate is 3Mbps, the frame frequency of a high-speed transmission frame is 128 frames/s, a high-speed frame second pulse is generated every 64 frames (0.5s), 8-bit measurement information is inserted into each frame of the 64 transmission frames, and the 64 frames complete the transmission of 1 complete measurement frame (500 bits).
In this embodiment, through the above steps, the ground station device implements synchronous management of the clock domain, and the reset pulse-per-second fi, the incoherent pulse-per-second Clk2pps, and the high-speed frame pulse-per-second are strictly aligned, and completes framing of the measurement frame and the transmission frame.
Preferably, the frame structure of the measurement frame is shown in table 1, and specifically may be: the uplink measurement frame under the measurement and control data transmission integrated system is the same as the incoherent spread spectrum uplink measurement frame, the uplink measurement frame consists of 50 words, and each word has 10 bits. Frame rate 2 frames/s, information rate: 500 bits/frame 2 frame/s 1000 bps.
| W1 | W2 | W3～W7 | W8～W46 | W47～W48 | W49～W50 |
| Frame counting | Ground station code | Time T of ground station | Retention | CRC | Frame synchronization DE20 |
Table 1, schematic table of frame structure of uplink measurement frame under integrated system of measurement and control and data transmission
Preferably, the frame structure of the high-speed transmission frame is shown in table 2, and specifically may be: taking the high speed 3Mbps mode as an example, the frame rate is 128 frames/s, and the information rate: the symbol rate after 1024 bytes/frame 8 bits/byte 128 frames/s 1048576bps 1/3Turbo channel coding is about 3 Mbps. The insertion area is used for inserting the measurement frame, and the data field is used for filling high-speed data transmission data.
| W1～W4 | W5～W12 | W13～W30 | W31～W1022 | W47～W48 |
| Frame sync word | Main guide head | Measuring the insertion area | Data field | CRC |
Table 2, downlink high-speed transmission frame structure under measurement and control integrated system
And a substep S2, obtaining an uplink time gate-opening pulse of the incoherent spread spectrum system and an uplink time gate-opening pulse of the high-speed transmission frame respectively according to the aligned measurement frame, the spread spectrum pseudo code and the high-speed transmission frame.
In this embodiment, the uplink time gating pulse of the incoherent spreading spectrum system may be obtained as follows:
and performing exclusive-or operation on the aligned measurement frame and the spread spectrum pseudo code to obtain a transmission baseband signal, and recording the last 1 information bit trailing edge of a frame synchronization word of the measurement frame before radio frequency modulation as the uplink time door opening pulse of the incoherent spread spectrum system.
In this embodiment, the uplink time open pulse of the high speed transmission frame may be obtained by:
performing logic processing on the aligned high-speed transmission frames to be used as a transmission baseband signal, and recording the last 1 sign bit back edge of a 1 st frame synchronization head in each 64 transmission frames before radio frequency modulation as an uplink time door opening pulse of the high-speed transmission frames; wherein the logic processing comprises: frame tail check, ping-pong buffer, Turbo coding and data scrambling.
And 103, aligning the uplink time gating pulse of the incoherent spread spectrum system with the uplink time gating pulse of the high-speed transmission frame.
In this embodiment, code adjustment, timing simulation, and high-speed oscilloscope test confirmation may be performed on the uplink time door-opening pulse of the incoherent spread spectrum system and the uplink time door-opening pulse of the high-speed transmission frame, so as to ensure that the uplink time door-opening pulse of the incoherent spread spectrum system and the uplink time door-opening pulse of the high-speed transmission frame are accurately aligned, so as to meet the purpose of accurately equalizing transmission delays. Therefore, the transmission time delay of the ground station of the incoherent spread spectrum and the high-speed transmission frame is the same, and the transmission frame format received by the ground station under the task mode and the calibration mode is the same, so the receiving time delay is equal, and therefore, the total receiving and transmitting processing time delay of the ground station is equal under the task mode and the calibration mode.
And step 104, respectively determining a distance absolute value in a task mode and a distance absolute value in a calibration mode according to the aligned uplink time door opening pulse of the incoherent spread spectrum system and the uplink time door opening pulse of the high-speed transmission frame.
In this embodiment, the ground station selects the mission mode, i.e. the system rf cable is connected to the transponder, the uplink uses non-coherent spreading, and the downlink uses high-speed transmission frames. Preferably, the absolute value of the distance in the mission mode can be determined as follows:
and taking the aligned uplink time door-opening pulse of the incoherent spread spectrum system as the starting time, taking the trailing edge of the last 1 sign bit of the frame synchronization head of the 1 st frame in 64 transmission frames demodulated by the downlink as the stopping time, and taking the time delay determined according to the starting time and the stopping time as the absolute value of the distance (recorded as R01) in the task mode.
In this embodiment, the ground station selects the calibration mode, that is, the system rf cable is connected to the zero calibration frequency converter (Rb), and both the uplink and the downlink adopt high-speed transmission frames. Preferably, the absolute value of the distance in the calibration mode (denoted as R02) can be determined as follows:
and taking the uplink time door-opening pulse of the aligned high-speed transmission frame as the starting time, taking the trailing edge of the last 1 sign bit of the 1 st frame synchronization head in each 64 transmission frames demodulated by the downlink as the stopping time, and taking the time delay determined according to the starting time and the stopping time as the absolute value R02 of the distance in the calibration mode.
And 105, determining a distance zero value of the integrated responder according to the difference value between the distance absolute value in the task mode and the distance absolute value in the calibration mode.
In this embodiment, the distance zero value (denoted as Rr) of the integrated transponder may be calculated as follows: rr ═ R01-R02+ Rb. As previously mentioned, Rb represents the time delay of the zero calibration frequency converter calibrated by the logic analyzer.
On the basis of the above embodiments, the following will briefly describe the implementation flow of the measurement, control and data transmission integration-based distance zero value calibration method according to the present invention with reference to fig. 2 to 6.
Referring to fig. 2, a block diagram of a zero value separation system in an embodiment of the invention is shown. The zero-value separation system can realize the distance zero-value calibration method based on measurement, control and data transmission integration, which comprises the following steps: when the switch K1 and the switch K2 are both arranged on the side of the spread spectrum responder, the system can obtain the absolute value R01 of the distance in the duty mode, and when the switch K1 and the switch K2 are both arranged on the side of the zero calibration frequency converter, the system can obtain the absolute value R02 of the distance in the calibration mode. When the time delay of the zero calibration frequency converter is Rb, the distance value Rr of the transponder in the integration mode can be obtained, and the Rr is R01-R02+ Rb.
Referring to fig. 3, a block diagram of a far-field wireless test zero-value separation system in an embodiment of the present invention is shown. As shown in fig. 3, the spread spectrum transponder and the zero calibration frequency converter can be disposed in the calibration tower, and the up-down switch matrix, the up-down converter and the 70Mhz baseband processing device can be disposed in the ground measurement and control station.
Referring to fig. 4, a block diagram of clock domain management in an embodiment of the invention is shown. In the embodiment, a system clock fs utilizes a numerically controlled oscillator NCO1 to generate a pseudo code rate fg, and utilizes a reset second pulse fi to periodically reset an NCO1, so as to obtain a periodic frequency fg1 of a spread spectrum pseudo code and an uplink measurement frame information rate fg2 through frequency division. The system clock fs utilizes a numerically controlled oscillator NCO2 to generate a symbol rate ft after the high-speed transmission frame coding of the measurement and control data transmission integrated system, utilizes a reset second pulse fi to periodically reset NCO2, and obtains an information rate ft1 and an effective byte rate ft2 of a high-speed transmission frame through frequency division.
Referring to fig. 5, a schematic diagram of a clock domain before delay alignment in an embodiment of the present invention is shown. In this embodiment, under the incoherent system, the incoherent second pulse Clk2pps of the uplink spread spectrum, the leading edge of the start phase of the 1 st pseudo code period in the N pseudo code periods, and the leading edge of the 1 st information bit of the measurement frame synchronization word are strictly aligned. Under the integrated system of measurement and control and data transmission, the incoherent second pulse Clk2pps of the high-speed uplink, the second pulse of the high-speed frame, and the leading edge of the 1 st bit of the frame head of the 1 st frame of the high-speed transmission frame are strictly aligned.
Referring to fig. 6, a schematic diagram of a delay-aligned clock domain in an embodiment of the present invention is shown. In this embodiment, in the incoherent system, the measurement frame information and the spread spectrum pseudo code are subjected to exclusive or operation to be used as a transmission baseband signal. Under the integrated system, the high-speed transmission frame is subjected to logical processing such as frame tail check, ping-pong cache, Turbo coding, data scrambling and the like and then is used as a transmission baseband signal. Through code adjustment and time sequence simulation, the high-speed oscilloscope is assisted to test and confirm, and the accurate alignment of the uplink time door opening pulse after the 2-mode logic processing is ensured so as to meet the aim of accurate and equal transmission time delay.
In summary, the distance zero value calibration method based on measurement and control data transmission integration determines the reset pulse per second according to the system clock, the spread spectrum pseudo code frequency of the incoherent spread spectrum system and the symbol rate after the high-speed transmission frame coding of the measurement and control data transmission integration system; determining an uplink time door opening pulse of an incoherent spread spectrum system and an uplink time door opening pulse of a high-speed transmission frame according to the reset second pulse; the method has the advantages that the time door opening pulse of the uplink of the incoherent spread spectrum system and the time door opening pulse of the uplink of the high-speed transmission frame are accurately aligned, so that the transmission time delay of ground station equipment is accurately equal, the distance zero value separation of the transponders is realized by utilizing the zero calibration frequency converter, and the problem that the distance zero values of the transponders cannot be directly separated when the uplink and downlink radio frequency characteristics are different is solved. Therefore, the invention provides a design idea of strict alignment of time door opening pulses of an uplink of a ground station against model backgrounds with different uplink and downlink radio frequency modulation characteristics, provides a realization method for ensuring accurate and equal transmission time delay, can solve the problem that distance zeros of integrated transponders cannot be directly separated when the uplink and downlink radio frequency characteristics are different by only adopting a zero calibration frequency converter, and meets the task requirements of effectiveness, simplification and reliability of the distance zero value separation method.
Secondly, the distance zero value calibration method based on the measurement, control and data transmission integration overcomes the accumulated time error of the numerical control oscillator caused by the truncation effect and avoids the zero value jump of the distance value.
Thirdly, the distance zero value calibration method based on the measurement, control and data transmission integration uses the frame synchronization head back edge hidden in the high-speed transmission frame and the measurement spread spectrum frame and before the final radio frequency modulation as the door opening pulse, so that the consistency of the modulation and transmission time delay of the ground station is realized.
In addition, the method of the invention is applied to the transmitted type satellite at present, through whole satellite performance test and ground station wireless docking, the error between the distance between the ground station and the calibration tower measured by the method of the invention and the actual real distance is less than 0.3m and far superior to the technical index of 3m required by the system, and the effectiveness, the feasibility and the reliability of the method are fully verified.
On the basis of the embodiment of the method, the invention also discloses a system for calibrating the distance zero value based on the measurement, control and data transmission integration, which comprises the following steps: the first determining module is used for determining reset second pulse according to a system clock, the frequency of a spread spectrum pseudo code of an incoherent spread spectrum system and the symbol rate after the high-speed transmission frame coding of a measurement and control data transmission integrated system; the system clock, the spread spectrum pseudo code frequency and the symbol rate are respectively integral multiples of the reset second pulse, and the reset second pulse is integral multiples of the incoherent second pulse; the second determining module is used for determining an uplink time door opening pulse of an incoherent spread spectrum system and an uplink time door opening pulse of a high-speed transmission frame according to the reset second pulse; the alignment module is used for aligning the uplink time gating pulse of the incoherent spread spectrum system with the uplink time gating pulse of the high-speed transmission frame; a third determining module, configured to determine, according to the aligned uplink time door-opening pulse of the incoherent spread spectrum system and the uplink time door-opening pulse of the high-speed transmission frame, a distance absolute value in the task mode and a distance absolute value in the calibration mode, respectively; and the fourth determining module is used for determining the distance zero value of the integrated transponder according to the difference value between the distance absolute value in the task mode and the distance absolute value in the calibration mode.
For the system embodiment, since it corresponds to the method embodiment, the description is relatively simple, and for the relevant points, refer to the description of the method embodiment section.
The embodiments in the present description are all described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
The above description is only for the best mode of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention.
Those skilled in the art will appreciate that the invention may be practiced without these specific details.
Claims (8)
1. A distance zero value calibration method based on measurement, control and data transmission integration is characterized by comprising the following steps:
determining reset second pulse according to a system clock, the frequency of a spread spectrum pseudo code of a non-coherent spread spectrum system and the symbol rate after the high-speed transmission frame coding of a measurement and control data transmission integrated system; the system clock, the spread spectrum pseudo code frequency and the symbol rate are respectively integral multiples of the reset second pulse, and the reset second pulse is integral multiples of the incoherent second pulse;
determining an uplink time door opening pulse of an incoherent spread spectrum system and an uplink time door opening pulse of a high-speed transmission frame according to the reset second pulse;
aligning the uplink time gating pulse of the incoherent spread spectrum system with the uplink time gating pulse of the high-speed transmission frame;
respectively determining a distance absolute value in a task mode and a distance absolute value in a calibration mode according to an aligned uplink time door opening pulse of an incoherent spread spectrum system and an uplink time door opening pulse of a high-speed transmission frame;
determining a distance zero value of the integrated transponder according to a difference value between the distance absolute value in the task mode and the distance absolute value in the calibration mode;
wherein, the determining the distance absolute value in the task mode and the distance absolute value in the calibration mode according to the aligned uplink time door opening pulse of the incoherent spread spectrum system and the uplink time door opening pulse of the high-speed transmission frame respectively comprises:
taking an uplink time door opening pulse of the aligned incoherent spread spectrum system as an initial time, taking the trailing edge of the last 1 sign bit of the frame synchronization head of the 1 st frame in 64 transmission frames demodulated by a downlink as a stopping time, and taking the time delay determined according to the initial time and the stopping time as an absolute value of the distance under a task mode;
and taking the uplink time door opening pulse of the aligned high-speed transmission frame as the starting time, taking the trailing edge of the last 1 sign bit of the 1 st frame synchronization head in each 64 transmission frames demodulated by the downlink as the stopping time, and taking the time delay determined according to the starting time and the stopping time as the absolute value of the distance in the calibration mode.
2. The measurement, control and data transmission integration-based distance zero value calibration method according to claim 1, wherein the determining of the uplink time gate-on pulse of the incoherent spread spectrum system and the uplink time gate-on pulse of the high-speed transmission frame according to the reset second pulse comprises:
aligning the reset second pulse, the incoherent second pulse and the high-speed frame second pulse to obtain an aligned measurement frame, a spread spectrum pseudo code and a high-speed transmission frame;
and respectively obtaining the uplink time door opening pulse of the incoherent spread spectrum system and the uplink time door opening pulse of the high-speed transmission frame according to the aligned measurement frame, the spread spectrum pseudo code and the high-speed transmission frame.
3. The measurement, control and data transmission integration-based distance zero value calibration method according to claim 2, wherein the aligning the reset second pulse, the incoherent second pulse and the high-speed frame second pulse to obtain an aligned measurement frame, a spread spectrum pseudo code and a high-speed transmission frame comprises:
resetting the first numerically-controlled oscillator under the incoherent spread spectrum system according to the second pulse to eliminate accumulated time errors caused by control word truncation, so that the initial phase front edge of the 1 st pseudo code period in the incoherent second pulse and the N pseudo code periods and the 1 st information bit front edge of the frame synchronization word of the measurement frame are strictly aligned, and the aligned measurement frame and the spread spectrum pseudo code are obtained;
and resetting the second numerically-controlled oscillator under the measurement and control data transmission integrated system according to the reset second pulse periodicity, eliminating accumulated time errors caused by control word truncation, and strictly aligning the incoherent second pulse, the high-speed frame second pulse and the leading edge of the 1 st bit of the frame head of the 1 st frame of the high-speed transmission frame to obtain the aligned high-speed transmission frame.
4. The measurement, control and data transmission integration-based distance zero value calibration method according to claim 3,
the starting phase of the pseudo code period refers to: measuring the 1 st pseudo code phase of the 1 st code period in N pseudo code periods contained in the 1 st information bit of the frame;
the measurement frame refers to: a data frame appointed for transmitting the measurement information;
the high-speed transmission frame is as follows: and uniformly framing the ranging/speed measuring information and the high-speed data transmission data and encoding the data frames.
5. The measurement, control and data transmission integration-based distance zero value calibration method according to claim 2, wherein the obtaining of the uplink time gate-on pulse of the incoherent spread spectrum system and the uplink time gate-on pulse of the high-speed transmission frame according to the aligned measurement frame, the spread spectrum pseudo code and the high-speed transmission frame respectively comprises:
performing exclusive-or operation on the aligned measurement frame and the spread spectrum pseudo code to obtain a transmission baseband signal, and recording the last 1 information bit trailing edge of a frame synchronization word of the measurement frame before radio frequency modulation as an uplink time gate-opening pulse of the incoherent spread spectrum system;
performing logic processing on the aligned high-speed transmission frames to be used as a transmission baseband signal, and recording the last 1 sign bit back edge of a 1 st frame synchronization head in each 64 transmission frames before radio frequency modulation as an uplink time door opening pulse of the high-speed transmission frames; wherein the logic processing comprises: frame tail check, ping-pong buffer, Turbo coding and data scrambling.
6. The measurement, control and data transmission integration-based distance zero value calibration method according to claim 1, further comprising:
generating a spread spectrum pseudo code frequency of the incoherent spread spectrum system through a first numerical control oscillator according to the system clock; wherein, the pseudo code frequency of spread spectrum includes: carrying out 1/M frequency division on the frequency of the spread spectrum pseudo code to obtain the periodic frequency of the uplink spread spectrum pseudo code, and carrying out 1/N-time frequency division on the periodic frequency of the uplink spread spectrum pseudo code obtained after 1/M frequency division to obtain the information rate when an uplink measurement frame is framed;
generating a symbol rate after coding and encoding of the high-speed transmission frame of the measurement and control data transmission integrated system by a second numerical control oscillator according to the system clock; wherein the symbol rate comprises: the information rate of the transmission frame framing obtained by dividing the symbol rate by 1/3 or 1/6, and the effective byte rate of the transmission frame framing obtained by dividing the information rate of the transmission frame framing obtained by dividing the transmission frame framing obtained by 1/3 or 1/6 by 1/8.
7. The measurement, control and data transmission integration-based distance zero value calibration method according to claim 8, wherein the determining a distance zero value of an integrated transponder according to the difference between the absolute distance value in the mission mode and the absolute distance value in the calibration mode comprises:
Rr＝R01-R02+Rb
wherein, R01 represents the absolute value of the distance in the task mode, R02 represents the absolute value of the distance in the calibration mode, Rr represents the distance zero value of the integrated transponder, and Rb represents the time delay of the zero calibration frequency converter calibrated by the logic analyzer.
8. The measurement, control and data transmission integration-based distance zero value calibration method according to claim 1,
the incoherent second pulse is 2Hz for the star.
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| CN109150287B (en) * | 2018-08-28 | 2020-11-10 | 西安空间无线电技术研究所 | Incoherent clock domain management method based on equal frame frequency transmission |
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| CN110824412B (en) * | 2019-10-21 | 2022-05-24 | 西安空间无线电技术研究所 | Non-coherent spread spectrum transponder distance zero value high-precision measurement system |
| CN113794502B (en) * | 2021-09-02 | 2023-05-05 | 上海卫星工程研究所 | Mars surrounding device measurement and control data transmission integrated system and method |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0304890A2 (en) * | 1987-08-24 | 1989-03-01 | Nec Corporation | Earth station capable of effectively using a frequency band of a satellite |
| CN101789859A (en) * | 2010-01-29 | 2010-07-28 | 中国科学院空间科学与应用研究中心 | Noncoherent distance measurement/time synchronism system of cluster link two-way asynchronous communication channel |
| CN104143997A (en) * | 2014-07-23 | 2014-11-12 | 西安空间无线电技术研究所 | Multi-access interference false locking resistance judgment method based on spread spectrum mechanism |
| CN104202116A (en) * | 2014-07-23 | 2014-12-10 | 西安空间无线电技术研究所 | Integrative method of measurement, control and data transmission based on Turbo coding |
| CN104459682A (en) * | 2014-11-18 | 2015-03-25 | 中国电子科技集团公司第十研究所 | Distance measurement method for automatically eliminating dynamic distance zero value |
| CN105897392A (en) * | 2014-12-15 | 2016-08-24 | 中国空间技术研究院 | Satellite-ground time synchronization system and method |
-
2017
- 2017-09-07 CN CN201710800938.5A patent/CN107797098B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0304890A2 (en) * | 1987-08-24 | 1989-03-01 | Nec Corporation | Earth station capable of effectively using a frequency band of a satellite |
| CN101789859A (en) * | 2010-01-29 | 2010-07-28 | 中国科学院空间科学与应用研究中心 | Noncoherent distance measurement/time synchronism system of cluster link two-way asynchronous communication channel |
| CN104143997A (en) * | 2014-07-23 | 2014-11-12 | 西安空间无线电技术研究所 | Multi-access interference false locking resistance judgment method based on spread spectrum mechanism |
| CN104202116A (en) * | 2014-07-23 | 2014-12-10 | 西安空间无线电技术研究所 | Integrative method of measurement, control and data transmission based on Turbo coding |
| CN104459682A (en) * | 2014-11-18 | 2015-03-25 | 中国电子科技集团公司第十研究所 | Distance measurement method for automatically eliminating dynamic distance zero value |
| CN105897392A (en) * | 2014-12-15 | 2016-08-24 | 中国空间技术研究院 | Satellite-ground time synchronization system and method |
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