CN116961786A - Device and method for self-calibrating time delay of transmission channel of long-wave transmitter - Google Patents
Device and method for self-calibrating time delay of transmission channel of long-wave transmitter Download PDFInfo
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- H—ELECTRICITY
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- H04B17/00—Monitoring; Testing
- H04B17/10—Monitoring; Testing of transmitters
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Abstract
The invention discloses a device and a method for self-calibrating time delay of a transmitting channel of a long-wave transmitter, wherein the device comprises a transmitting control unit, a transmitting host, a tuning network, a current sampling ring and a signal monitoring unit; the emission control unit adjusts the time delay of the PWM driving signal relative to the MPT trigger signal according to the emission channel time delay correction amount, so as to adjust the emission channel time delay value; the transmitting host outputs a synthesized excitation voltage signal according to the PWM signal; the tuning network generates a transmit current signal radiated by the transmit antenna according to the synthesized excitation voltage signal; the current sampling ring collects the emission current signal and converts the same proportion into a low-level signal to be output; and the signal monitoring unit obtains the time delay correction of the transmitting channel according to the MPT trigger signal and the output of the current sampling loop. The invention is realized by transmitting the time delay of the channel is controlled in a closed loop, eliminating long-term drift, so that the drift is not influenced by environmental factors; by self-calibrating the transmit channel delay, a fixed delay is maintained, eliminating long-term drift.
Description
Technical Field
The invention belongs to the technical field of electronic information and low-frequency electromagnetic transmission, and particularly relates to a device and a method for self-calibrating time delay of a transmission channel of a Roland transmitter, which can be applied to the application occasions such as Roland C radio navigation, high-precision long-wave time service and the like.
Background
The long Polaroid navigation time service system is a ground-based remote radio navigation time service system, is widely used by countries around the world before the space-based satellite navigation system is brought out, and is built into a plurality of large navigation station chains covering the main sea area of the world. The system transmits a Roland C pulse signal, and the signal is an international standard radio signal widely adopted by a modern long-wave radio positioning, navigation and time service system by using phase modulation pulse with the central frequency of 100kHz and an envelope line of exponential.
The rowland C radio navigation system was the mainstream remote navigation and time service system in the 80 s ago, and is very widely used. With the wide application of GPS and Beidou navigation, the attention of the Roland C system is reduced. But the roc C system is still reserved in countries such as europe and america. The related research report in the united states shows that: if the GPS satellite navigation system is used as the sole navigation means, the GPS satellite navigation system mainly depends on the space-based satellite, so that the damage is difficult to repair, the satellite signals transmitted to the ground are easy to be shielded and attenuated, the signal quality is poor in some complex terrains and tropical rain forest areas, and the satellite signals are also easy to be interfered. The Roland C radio wave in the long wave band has the characteristics of stable transmission, small propagation loss, strong anti-interference capability and the like, and the Roland C system becomes the best supplement and enhancement for the space-based satellite navigation system, and is focused again, thus showing more and more important strategic values.
Entering the 21 st century, the new generation of enhanced Roland C navigation technology is further developed for constructing an elastic PNT system abroad. The Roland signal is used as a differential GPS correction value, the pulse time shift modulation is used for additionally modulating the Roland signal, the data communication and differential correction functions are added, the precision of the ground-based radio navigation time service can be effectively improved, and the method becomes a main development direction of a new generation of ground-based radio PNT and is recently paid attention to at home and abroad. The new generation of enhanced Roland navigation technology improves the positioning precision to within 20m, and the time service precision to the order of hundred nanoseconds, so that the performance of the ground-based Roland navigation technology is greatly improved, and the requirements of navigation, aviation and land motor operations and the time/frequency of key facilities can be effectively met.
The Roland transmitter is a core link of the Roland navigation system, and defines the absolute time of transmission by using the third week zero crossing point moment of the Roland pulse carrier. The trigger pulse MPT of the third-week zero crossing point relative to the Roland exciter is the time delay of a transmitting channel of the transmitter, and the control precision of the time delay of the transmitting channel is related to the time service precision of the whole system. The new generation of enhanced Roland communication system has higher requirements on the delay jitter precision of a transmitting channel, and the transmitting precision is less than 10 ns. The delay of the transmitting channel is affected by the delay of each link of the transmitter, such as the frequency stability of crystal oscillator, the rising and falling time of the switching process of a power amplifier switching tube, the drift of antenna electrical parameters and the like, which cause the delay of the transmitting channel to be slowly changed along with the change of the working environment factors, and the delay of the transmitting channel is necessary to be self-calibrated and kept as a fixed delay.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide a self-calibration device and method for the time delay of a transmitting channel of a Roland transmitter, and aims to solve the problems of drift and fluctuation of the transmitting time of the existing Roland transmitter.
The invention provides a self-calibration device for the time delay of a transmitting channel of a long-wave transmitter, which is arranged between an excitation unit and a transmitting antenna and comprises a transmitting control unit, a transmitting host, a tuning network, a current sampling ring and a signal monitoring unit; the first input end of the emission control unit is connected to the output end of the excitation unit, the second input end of the emission control unit is connected to the output end of the signal monitoring unit, and the emission control unit is used for adjusting the time delay of the PWM driving signal relative to the MPT trigger signal according to the emission channel time delay correction amount so as to adjust the emission channel time delay value Td; the input end of the transmitting host is connected to the output end of the transmitting control unit and is used for outputting a synthesized excitation voltage signal according to the PWM signal; the input end of the tuning network is connected to the output end of the transmitting host, and the tuning network is used for generating a transmitting current signal radiated by the transmitting antenna according to the synthesized excitation voltage signal; the input end of the current sampling ring is connected to the output end of the tuning network, and the current sampling ring is used for collecting the emission current signal and converting the emission current signal into a low-level signal in an equal proportion and then outputting the low-level signal; the first input end of the signal monitoring unit is connected to the output end of the current sampling ring, the second input end of the signal monitoring unit is connected to the output end of the excitation unit, and the signal monitoring unit is used for obtaining the time delay correction amount of the transmitting channel according to the MPT trigger signal and the output of the current sampling ring.
Further, the emission control unit comprises a time delay adjustment module, an excitation signal generation module and a PWM driving module which are sequentially connected; the time delay adjustment module is used for realizing high-precision time delay calibration in a coarse time delay and fine time delay two-stage adjustment mode; the excitation signal generation module is used for generating a step wave voltage reference waveform required by an excitation tuning network; the PWM driving module is used for decomposing the step wave voltage reference waveform into driving signals required by the transmitting host, and then distributing the driving signals to each power amplifier of the transmitting host to drive the transmitting host to amplify power and synthesize high-power step wave voltage waveforms.
Further still the ground is used to determine the position of the ground, the time delay adjustment module comprises: a time delay adjustment amount distribution unit, a coarse adjustment timing counting unit and a fine adjustment delay unit; the input end of the delay adjustment quantity distribution unit is used for receiving the delay correction quantity, and the delay adjustment quantity distribution unit is used for outputting a coarse adjustment count value and a fine adjustment count value according to the delay correction quantity; the first input end of the coarse timing counting unit is used for receiving the MPT trigger signal, the second input end is used for receiving the clock signal, the third input end is connected to the first output end of the time delay adjustment amount distribution unit, and the coarse timing counting unit is used for delaying according to the MPT trigger signal and the coarse adjustment count value in a timing counting mode; the first input end of the fine adjustment delay unit is connected to the second output end of the delay adjustment amount distribution unit, the second input end of the fine adjustment delay unit is connected to the output end of the coarse adjustment timing counting unit, and the fine adjustment delay unit is used for obtaining PWM driving signals according to the fine adjustment count value and the output of the coarse adjustment timing counting unit in a mode of programming a fixed delay line.
Further, the signal monitoring unit comprises an FPGA signal processing unit and an AD sampling unit which are sequentially connected; the AD sampling unit is used for carrying out analog-to-digital conversion on the emission current signals acquired by the current sampling ring; the FPGA signal processing unit is used for identifying the third-week zero-crossing point of the current signal carrier according to the MPT trigger signal and the current signal after analog-to-digital conversion, calculating the time delay Td from the MPT trigger signal to the third-week zero-crossing point by taking the MPT trigger signal as the starting moment, and comparing the time delay of the test transmitting channel with the set time delay value to output the time delay correction quantity of the transmitting channel.
Further, the adjusting the PWM driving signal delay Td1 by the emission control unit according to the emission channel delay correction amount specifically includes: when the correction amount Deltat is positive, which means that the emission channel delay Td is too large, the PWM driving signal delay is reduced to (Td 1-Deltat); when the correction amount Δt is negative, which means that the transmission channel delay Td is too small, the PWM driving signal delay is increased to (td1+|Δt|).
The invention also provides a self-calibration method for the time delay of the transmitting channel of the long-wave transmitter, which comprises the following steps:
s1: when the transmitter transmits a high-power Roland signal, acquiring a transmitting current signal;
s2: obtaining a transmission channel delay correction amount according to the transmission current signal and the MPT trigger signal;
s3: decomposing the transmission channel delay correction into a coarse adjustment count value and a fine adjustment count value;
s4: outputting the MPT trigger signal subjected to coarse adjustment delay according to the MPT trigger signal and the coarse adjustment count value;
s5: and carrying out fine adjustment delay on the MPT trigger signal subjected to coarse adjustment delay according to the fine adjustment count value, thereby realizing the closed loop calibration of the time delay of the transmitting channel.
Wherein, according to the formulaObtaining the coarse adjustment count value; wherein D is a reference zero crossing offset error in ns, []To round down the symbol, N is a coarse count value.
Wherein, according to the formulaObtaining the fine adjustment count value; wherein D is a reference zero crossing offset error in ns, []To round down the symbol, M is a fine-tuning count value.
Further, the step S4 specifically includes: the counter starts to count N times when the MPT trigger signal is input, and outputs the MPT trigger signal subjected to coarse adjustment delay after delay by 5N nanoseconds.
Further, step S5 specifically includes: and (3) distributing M-order delay lines according to the fine adjustment count value, and completing the closed-loop calibration of the delay of the transmitting channel after the MPT trigger signal subjected to coarse adjustment delay is subjected to delay of 100M picoseconds.
Compared with the prior art, the method and the device for detecting the zero crossing point of the third cycle of the emission Roland current test the time delay of the emission channel, and perform coarse and fine adjustment on the time delay of the emission control unit, so that the time delay of the emission channel is self-calibrated and kept to be a fixed time delay value; the following beneficial effects can be achieved:
(1) And the time delay of the transmitting channel is controlled in a closed loop manner, so that long-term drift is eliminated, and the transmitting channel is not influenced by environmental factors. The time delay of the transmitting channel is influenced by the time delay of each link of the transmitter, such as the frequency stability of crystal oscillator, the rising and falling time of the switching process of a power amplifier switching tube, the drift of antenna electrical parameters and the like, which cause the time delay of the transmitting channel to change slowly along with the change of the working environment factors, and the long-term drift is eliminated by self-calibrating the time delay of the transmitting channel, keeping the fixed time delay.
(2) The time delay control precision of the transmitting channel is high, and the time delay control precision of the transmitting channel is within 1ns through setting the theoretical time delay threshold range of the transmitting channel and two-stage closed-loop calibration of the coarse and fine time delay modules.
Drawings
Fig. 1 is a schematic block diagram of a transmit channel delay self-calibration device of a rowland transmitter according to an embodiment of the present invention;
fig. 2 is a block diagram of a transmission control unit in a transmission channel delay self-calibration device of a rowland transmitter according to an embodiment of the present invention;
fig. 3 is a block diagram of a delay adjustment module in a transmission control unit in a transmission channel delay self-calibration device of a rowland transmitter according to an embodiment of the present invention;
fig. 4 is a schematic diagram of a transmission channel delay in a self calibration device for a transmission channel delay of a rowland transmitter according to an embodiment of the present invention;
fig. 5 is a schematic diagram of a transmission channel delay waveform in a transmission channel delay self-calibration device of a rowland transmitter according to an embodiment of the present invention;
fig. 6 is a flowchart of an implementation of a method for self-calibrating a delay of a transmit channel of a rowland transmitter according to an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
In order to meet the requirement of a new generation of enhanced Roland emission system on the control of the emission precision, the invention provides a self-calibration method of the emission channel time delay of a Roland emitter.
Fig. 1 shows a schematic block diagram of a transmit channel delay self-calibration device of a rowland transmitter according to an embodiment of the present invention, and for convenience of explanation, only the parts related to the embodiment of the present invention are shown, which is described in detail below:
the device for self-calibrating the time delay of the transmission channel of the long-wave transmitter is arranged between the excitation unit 1 and the transmission antenna 5 and comprises a transmission control unit 2, a transmission host 3, a tuning network 4, a current sampling ring 6 and a signal monitoring unit 7; the first input end of the emission control unit 2 is connected to the output end of the excitation unit 1, the second input end of the emission control unit 2 is connected to the output end of the signal monitoring unit 7, and the emission control unit 2 is used for adjusting the delay of the PWM driving signal relative to the MPT trigger signal according to the emission channel delay correction amount so as to adjust the emission channel delay value Td; the input end of the transmitting host 3 is connected to the output end of the transmitting control unit 2 and is used for outputting a synthesized excitation voltage signal according to the PWM signal; the input end of the tuning network 4 is connected to the output end of the transmitting host 3, and the tuning network 4 is used for generating a transmitting current signal radiated through the transmitting antenna 5 according to the synthesized exciting voltage signal; the input end of the current sampling ring 6 is connected to the output end of the tuning network 4, and the current sampling ring 6 is used for collecting the emission current signal and converting the emission current signal into a low-level signal in an equal proportion and then outputting the low-level signal; the first input end of the signal monitoring unit 7 is connected to the output end of the current sampling loop 6, the second input end of the signal monitoring unit 7 is connected to the output end of the excitation unit 1, and the signal monitoring unit 7 is used for obtaining the transmission channel delay correction amount according to the MPT trigger signal and the output of the current sampling loop 6.
When the power synthesis system works, the excitation unit 1 sends MPT trigger signals to the emission control unit 2, the emission control unit 2 generates PWM driving signals required by the emission host 3 and distributes the PWM driving signals to each power amplification module to drive the power amplification units, and the power synthesis network output end synthesizes digitized step excitation voltage waveforms conforming to the excitation waveform functions. This high power excitation voltage is directly input to the tuning network 4. The antenna tuning network 4 is configured to fully compensate the reactance of the transmitting antenna 5, and the predistorted excitation voltage generates a rowland current waveform in the antenna loop, and radiates a rowland signal meeting the broadcasting requirement from the transmitting antenna.
The invention eliminates long-term drift through the time delay closed-loop control of the transmitting channel, so that the transmitting channel is not influenced by environmental factors. The time delay of the transmitting channel is influenced by the time delay of each link of the transmitter, such as the frequency stability of crystal oscillator, the rising and falling time of the switching process of a power amplifier switching tube, the drift of antenna electrical parameters and the like, which cause the time delay of the transmitting channel to change slowly along with the change of the working environment factors, and the long-term drift is eliminated by self-calibrating the time delay of the transmitting channel, keeping the fixed time delay.
As shown in fig. 2, the emission control unit 2 includes a delay adjustment module 21, an excitation signal generation module 22, and a PWM driving module 23, which are sequentially connected; the delay adjustment module 21 is used for realizing high-precision delay calibration by a coarse delay and fine delay two-stage adjustment mode; the excitation signal generation module 22 is used for generating a step wave voltage reference waveform required by the excitation tuning network; the PWM driving module 23 is configured to decompose the step wave voltage reference waveform into driving signals required by the transmitting host, and then allocate the driving signals to each power amplifier of the transmitting host, so as to drive the transmitting host to perform power amplification, and synthesize a high-power step wave voltage waveform.
In the embodiment of the invention, in order to accurately control the time delay of the transmitting channel, the transmitting control unit 2 is designed into two-stage delay, and high-precision time delay calibration is realized by a mode of two-stage adjustment of coarse time delay and fine time delay; according to different timing adjustment precision of the thickness timing adjustment unit, two-stage calculation and division are carried out on the input timing adjustment correction quantity, the first stage adopts a timing counter mode to carry out time delay, and the control precision can reach 5ns; the second stage adopts a programmed fixed delay line to carry out time delay, and the control precision can reach hundred picoseconds.
As shown in fig. 3, the delay adjustment module 21 includes: a delay adjustment amount distribution unit 211, a coarse timing counting unit 212, and a fine delay unit 213; the input end of the delay adjustment amount distribution unit 211 is used for receiving the delay correction amount, and the delay adjustment amount distribution unit 211 is used for outputting a coarse adjustment count value and a fine adjustment count value according to the delay correction amount; the first input end of the coarse tuning timing counting unit 212 is used for receiving the MPT trigger signal, the second input end is used for receiving the clock signal, the third input end is connected to the first output end of the time delay adjustment amount distributing unit 211, and the coarse tuning timing counting unit 212 is used for delaying according to the MPT trigger signal and the coarse tuning count value in a timing counting mode; the first input end of the fine tuning delay unit 213 is connected to the second output end of the delay adjustment amount distribution unit 211, the second input end of the fine tuning delay unit 213 is connected to the output end of the coarse tuning timing counting unit 212, and the fine tuning delay unit 213 is configured to obtain a PWM driving signal according to the fine tuning count value and the output of the coarse tuning timing counting unit 212 by programming a fixed delay line.
In the embodiment of the present invention, the coarse adjustment count value N and the fine adjustment count value M may be calculated according to the following formulas,wherein D is the reference zero crossing offset error output by the monitoring system, and the unit is ns [ []To round down the symbol, N is a coarse count value and M is a fine count value.
As one embodiment of the invention, the coarse tuning timing counting unit can adopt 200MHz clock counting in an FPGA chip, and realize large dynamic range delay adjustment by a method of counting delay time by a counter. The delay correction from the Roland signal monitoring unit is firstly written into the delay adjustment amount distribution unit, and the pulse signal is counted and delayed for N times according to the coarse adjustment count value N calculated by the delay adjustment amount distribution unit, the delay time is N multiplied by 5ns, and then the pulse signal after coarse adjustment delay is directly transmitted to the fine adjustment programmable fixed delay line unit.
As an embodiment of the invention, the fine-tuning programmable fixed delay line unit can be realized by adopting a programmable fixed delay line in an FPGA high-performance IO module, and the typical programmable fixed delay unit consists of a 32-step tap delay line and a 5-bit delay counter, and the control precision of the 200MHz clock calibration can reach 100 picoseconds, and the dynamic range is 0-5 ns. And the fine-tuning programmable fixed delay line unit distributes M-stage delay lines according to the fine-tuning count value M calculated by the delay adjustment quantity distribution unit, and outputs the pulse signal after fine-tuning delay to the PWM driving module of the emission control unit after carrying out fixed delay of M multiplied by 100 ps.
According to the embodiment of the invention, the emission control unit realizes the automatic calibration of the time delay closed loop of the emission channel in a mode of coarse timing adjustment and fine timing adjustment, and the control precision is within 1 ns.
In the embodiment of the invention, the self-calibration function of the time delay of the transmitting channel is completed by a time delay adjustment module of the transmitting control unit, a signal monitoring unit and a current sampling ring; as shown in fig. 4, the transmission channel delay Td includes a two-part MPT (Multiple Pulse Trigger, multi-pulse trigger signal) to PWM drive signal delay Td1 and a PWM drive signal to rowland pulse reference zero crossing, that is, a third-cycle zero crossing of the pulse carrier (standard "gb_t14379-1993 rowland C system general technical condition" defines a reference zero crossing, that is, a reference time point when the rowland signal is time-shared) delay Td2.
In the embodiment of the invention, the signal monitoring unit 7 comprises an FPGA signal processing unit and an AD sampling unit which are sequentially connected; the AD sampling unit is used for carrying out analog-to-digital conversion on the emission current signals acquired by the current sampling ring 6; and the FPGA signal processing unit is used for identifying the third-week zero crossing point of the current signal carrier according to the MPT trigger signal and the current signal after analog-to-digital conversion, calculating the time delay Td from the MPT trigger signal to the third-week zero crossing point by taking the MPT trigger signal as the starting moment, comparing the time delay of the test transmitting channel with a set time delay value, and outputting the time delay correction quantity of the transmitting channel.
The signal monitoring unit mainly comprises a high-speed AD sampling circuit and an FPGA signal processing circuit, and is used for completing the sampling of the Rogowski signal and the detection of the zero crossing point moment of the Rogowski pulse carrier. The Roland signal monitoring unit receives an MPT trigger signal sent by the Roland exciter and a Roland current signal sampled by a current loop, identifies a third cycle zero crossing point of a carrier wave of the Roland current signal, calculates the time delay from the MPT to the third cycle zero crossing point by taking the MPT trigger signal as a starting time, and compares the time delay of a test transmitting channel with a set time delay value (a fixed time delay index distributed to a transmitter by a long wave navigation time service system) as shown in fig. 5, and corrects the time delay according to the fixed time delay at a receiving end.
The signal monitoring unit feeds back the transmission channel delay correction quantity delta t to the transmission control unit delay module for closed loop calibration, generates PWM driving signals, drives the transmission host to carry out power amplification, and outputs Rogowski pulse signals. The output Roland pulse time depends on the power amplification time of the transmitting host, namely the PWM driving time, and the time delay of the output Roland pulse time relative to the PWM driving time is the time delay from the PWM driving signal to the power amplifier switch action, generally, the fixed time delay of 1-2ns level is determined by the hardware of the driving circuit. The emission control unit adjusts the delay Td1 of the PWM driving signal relative to the MPT trigger signal through the delay module, so as to adjust the delay value of the output Roland pulse signal relative to the MPT trigger signal, namely the emission channel delay value Td.
As an embodiment of the present invention, the adjustment of the PWM driving signal delay Td1 by the emission control unit 2 according to the emission channel delay correction amount specifically includes: when the correction amount Deltat is positive, which means that the emission channel delay Td is too large, the PWM driving signal delay is reduced to (Td 1-Deltat); when the correction amount Δt is negative, which means that the transmission channel delay Td is too small, the PWM driving signal delay is increased to (td1+|Δt|).
The invention eliminates long-term drift by performing closed-loop control on the time delay of the transmitting channel, so that the transmitting channel is not influenced by environmental factors. The time delay of the transmitting channel is influenced by the time delay of each link of the transmitter, such as the frequency stability of crystal oscillator, the rising and falling time of the switching process of a power amplifier switching tube, the drift of antenna electrical parameters and the like, which cause the time delay of the transmitting channel to change slowly along with the change of the working environment factors, and the long-term drift is eliminated by self-calibrating the time delay of the transmitting channel, keeping the fixed time delay. In addition, the time delay control precision of the transmitting channel is high, and the time delay control precision of the transmitting channel is within 1ns through setting the theoretical time delay threshold range of the transmitting channel and two-stage closed-loop calibration of the coarse and fine time delay modules.
As shown in fig. 6, the present invention further provides a method for self-calibrating a delay of a transmission channel of a long-wave transmitter, which includes the following steps:
s1: when the transmitter transmits a high-power Roland signal, acquiring a transmitting current signal;
s2: obtaining a transmission channel delay correction amount according to the transmission current signal and the MPT trigger signal;
s3: decomposing the time delay correction quantity of the transmitting channel into a coarse adjustment count value and a fine adjustment count value;
s4: outputting the MPT trigger signal subjected to coarse adjustment delay according to the MPT trigger signal and the coarse adjustment count value;
s5: and carrying out fine adjustment delay on the MPT trigger signal subjected to coarse adjustment delay according to the fine adjustment count value, thereby realizing the closed loop calibration of the time delay of the transmitting channel.
As one embodiment of the invention, the formula may be based onObtaining the coarse adjustment count value; wherein D is a reference zero crossing offset error in ns, []To round down the symbol, N is a coarse count value. Can be according to the formulaObtaining the fine adjustment count value; wherein D is a reference zero crossing offset error in ns, []To round down the symbol, M is a fine-tuning count value.
In the embodiment of the present invention, step S4 specifically includes: the counter starts to count N times when the MPT trigger signal is input, and outputs the MPT trigger signal subjected to coarse adjustment delay after delay by 5N nanoseconds.
In the embodiment of the present invention, step S5 specifically includes: and (3) distributing M-order delay lines according to the fine adjustment count value, and completing the closed-loop calibration of the delay of the transmitting channel after the MPT trigger signal subjected to coarse adjustment delay is subjected to delay of 100M picoseconds.
The self-calibration method provided by the invention solves the problems that the time delay of the transmitting channel of the existing Roland transmitter cannot be adjusted in a closed loop and long-term drift and short-term fluctuation exist. And long-term drift is eliminated through the time delay closed-loop calibration control of the transmitting channel, so that the transmitting channel is not influenced by environmental factors. Through coarse adjustment and fine adjustment time delay two-stage closed loop calibration, the time delay control precision of a transmitting channel is within 1ns, so that the requirement of a new generation of enhanced Roland navigation time service system on high-precision transmitting control of a transmitter is met.
In the embodiment of the invention, the self-calibration method is realized based on the self-calibration device of the time delay of the transmission channel of the long-wave transmitter, and specifically comprises the following steps:
(1) The transmitter transmits the Roland signal with high power, and the current sampling ring collects current waveforms to the signal monitoring module.
(2) The signal monitoring module detects and identifies the Roland waveform reference zero crossing point to obtain a transmission channel time delay measurement value, subtracts the time delay measurement value from a set fixed time delay value to obtain a transmission channel time delay correction quantity Deltat, and transmits the transmission channel time delay correction quantity Deltat to the transmission control unit. The signal monitoring unit is mainly used for sampling the Roland signals and detecting zero crossing points of the Roland pulse carrier waves; the signal monitoring unit receives an MPT trigger signal sent by the Roland exciter and a Roland current signal sampled by a current loop, identifies a third-week zero-crossing point of a carrier wave of the Roland current signal, takes the MPT trigger signal as a starting moment, and calculates a time delay Td from the MPT to the third-week zero-crossing point; the signal monitoring unit compares the time delay of the test transmitting channel with the set time delay value to obtain the time delay correction quantity of the transmitting channel.
(3) The emission control unit adjusts the PWM driving signal delay Td1 according to the emission channel delay correction amount. When the correction amount Deltat is positive, which means that the emission channel delay Td is too large, the PWM driving signal delay is reduced to (Td 1-Deltat). When the correction amount Δt is negative, which means that the transmission channel delay Td is too small, the PWM driving signal delay is increased to (td1+|Δt|).
(4) The time delay adjustment process is completed by a time delay adjustment module of the emission control unit. The delay correction amount Deltat is fed to the timing adjustment amount distribution unit, and is decomposed into a coarse timing adjustment count N and a fine adjustment count M according to formulas (1) and (2).
(5) The timing adjustment quantity distribution unit sends the coarse adjustment timing adjustment count N to the coarse adjustment timing count unit, and the fine adjustment count M to the fine adjustment programmable fixed delay line unit
(6) The coarse timing counting unit completes the coarse adjustment of the time delay. The rising edge of the input MPT trigger signal triggers the coarse adjustment counter, and under the drive of a 200MHz system clock, the coarse adjustment counter starts to count N times, delays for N multiplied by 5ns, and outputs the MPT trigger signal with coarse adjustment delay.
(7) Fine-tuning the programmable fixed delay line unit completes the fine-tuning of the delay. The fine-tuning programmable fixed delay line unit receives the fine-tuning count value M, distributes M-order delay lines, and outputs the fine-tuning delayed MPT trigger signal to the PWM driving module of the emission control unit after the input coarse-tuning delayed MPT trigger signal passes through the configured delay lines to carry out fixed delay of M multiplied by 100ps, so that the time delay closed-loop calibration of the emission channel is completed.
In the embodiment of the invention, the coarse adjustment timing counting unit is used for carrying out coarse adjustment on the part exceeding ns magnitude in the time delay in a large range, and the control precision can reach 5ns; the small-range adjustment of high precision is carried out on the part with the time delay smaller than ns magnitude by the fine-tuning programmable fixed delay unit, and the control precision can reach hundred picoseconds.
It will be readily appreciated by those skilled in the art that the foregoing description is merely a preferred embodiment of the invention and is not intended to limit the invention, but any modifications, equivalents, improvements or alternatives falling within the spirit and principles of the invention are intended to be included within the scope of the invention.
Claims (10)
1. The self-calibration device for the time delay of the transmission channel of the long-wave transmitter is arranged between an excitation unit (1) and a transmission antenna (5), and is characterized by comprising a transmission control unit (2), a transmission host (3), a tuning network (4), a current sampling ring (6) and a signal monitoring unit (7);
the first input end of the emission control unit (2) is connected to the output end of the excitation unit (1), the second input end of the emission control unit (2) is connected to the output end of the signal monitoring unit (7), and the emission control unit (2) is used for adjusting the time delay of the PWM driving signal relative to the MPT trigger signal according to the time delay correction amount of the emission channel so as to adjust the time delay value Td of the emission channel;
the input end of the transmitting host (3) is connected to the output end of the transmitting control unit (2) and is used for outputting a synthesized excitation voltage signal according to a PWM signal;
-an input of the tuning network (4) is connected to an output of the transmitting host (3), the tuning network (4) being adapted to generate a transmit current signal radiated by the transmitting antenna (5) from the composite excitation voltage signal;
the input end of the current sampling ring (6) is connected to the output end of the tuning network (4), and the current sampling ring (6) is used for collecting the emission current signal and converting the emission current signal into a low-level signal in an equal proportion and then outputting the low-level signal;
the first input end of the signal monitoring unit (7) is connected to the output end of the current sampling ring (6), the second input end of the signal monitoring unit (7) is connected to the output end of the excitation unit (1), and the signal monitoring unit (7) is used for obtaining the emission channel delay correction amount according to an MPT trigger signal and the output of the current sampling ring (6).
2. The transmission channel delay self-calibration device according to claim 1, wherein the transmission control unit (2) comprises a delay adjustment module (21), an excitation signal generation module (22) and a PWM driving module (23) which are connected in sequence;
the time delay adjustment module (21) is used for realizing high-precision time delay calibration in a coarse time delay and fine time delay two-stage adjustment mode;
the excitation signal generation module (22) is used for generating a step wave voltage reference waveform required by an excitation tuning network;
the PWM driving module (23) is used for decomposing the step wave voltage reference waveform into driving signals required by the transmitting host, and then distributing the driving signals to each power amplifier of the transmitting host to drive the transmitting host to amplify power so as to synthesize a high-power step wave voltage waveform.
3. The transmit channel delay self-calibration device according to claim 2, characterized in that the delay adjustment module (21) comprises: a time delay adjustment amount distribution unit (211), a coarse adjustment timing counting unit (212), and a fine adjustment delay unit (213);
the input end of the delay adjustment quantity distribution unit (211) is used for receiving a delay correction quantity, and the delay adjustment quantity distribution unit (211) is used for outputting a coarse adjustment count value and a fine adjustment count value according to the delay correction quantity;
a first input end of the coarse timing counting unit (212) is used for receiving an MPT trigger signal, a second input end is used for receiving a clock signal, a third input end is connected to a first output end of the time delay adjustment quantity distribution unit (211), and the coarse timing counting unit (212) is used for delaying in a timing counting mode according to the MPT trigger signal and the coarse adjustment count value;
the first input end of the fine adjustment delay unit (213) is connected to the second output end of the delay adjustment amount distribution unit (211), the second input end of the fine adjustment delay unit (213) is connected to the output end of the coarse adjustment timing counting unit (212), and the fine adjustment delay unit (213) is used for obtaining a PWM driving signal according to the fine adjustment count value and the output of the coarse adjustment timing counting unit (212) in a manner of programming a fixed delay line.
4. A transmission channel delay self-calibration device according to any one of claims 1-3, characterized in that the signal monitoring unit (7) comprises an FPGA signal processing unit and an AD sampling unit connected in sequence;
the AD sampling unit is used for carrying out analog-to-digital conversion on the emission current signals acquired by the current sampling ring (6);
the FPGA signal processing unit is used for identifying a third-week zero-crossing point of the current signal carrier according to the MPT trigger signal and the current signal after analog-to-digital conversion, calculating the time delay Td from the MPT trigger signal to the third-week zero-crossing point by taking the MPT trigger signal as the starting moment, and comparing the time delay of the test transmitting channel with a set time delay value to output the time delay correction quantity of the transmitting channel.
5. The transmission channel delay self-calibration device according to claim 1, wherein the transmission control unit (2) adjusts the PWM driving signal delay Td1 according to the transmission channel delay correction amount specifically includes:
when the correction amount Deltat is positive, which means that the emission channel delay Td is too large, the PWM driving signal delay is reduced to (Td 1-Deltat);
when the correction amount Δt is negative, which means that the transmission channel delay Td is too small, the PWM driving signal delay is increased to (td1+|Δt|).
6. The method for self-calibrating the time delay of the transmission channel of the long-wave transmitter is characterized by comprising the following steps:
s1: when the transmitter transmits a high-power Roland signal, acquiring a transmitting current signal;
s2: obtaining a transmission channel delay correction amount according to the transmission current signal and the MPT trigger signal;
s3: decomposing the transmission channel delay correction into a coarse adjustment count value and a fine adjustment count value;
s4: outputting the MPT trigger signal subjected to coarse adjustment delay according to the MPT trigger signal and the coarse adjustment count value;
s5: and carrying out fine adjustment delay on the MPT trigger signal subjected to coarse adjustment delay according to the fine adjustment count value, thereby realizing the closed loop calibration of the time delay of the transmitting channel.
7. The method of transmit channel delay self-calibration of claim 6, wherein the equation is based onObtaining the coarse adjustment count value; wherein D is a reference zero crossing offset error in ns, []To round down the symbol, N is a coarse count value.
8. The method of transmit channel delay self-calibration of claim 6 or 7, wherein the method is based on the formulaObtaining the fine adjustment count value; wherein D is a reference zero crossing offset error in ns, []To round down the symbol, M is a fine-tuning count value.
9. The method for self-calibration of transmission channel delay as claimed in claim 6, wherein step S4 is specifically: the counter starts to count N times when the MPT trigger signal is input, and outputs the MPT trigger signal subjected to coarse adjustment delay after delay by 5N nanoseconds.
10. The method for self-calibration of transmission channel delay according to claim 6 or 9, wherein step S5 is specifically: and (3) distributing M-order delay lines according to the fine adjustment count value, and completing the closed-loop calibration of the delay of the transmitting channel after the MPT trigger signal subjected to coarse adjustment delay is subjected to delay of 100M picoseconds.
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| CN202310952946.7A CN116961786A (en) | 2023-07-31 | 2023-07-31 | Device and method for self-calibrating time delay of transmission channel of long-wave transmitter |
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| CN202310952946.7A CN116961786A (en) | 2023-07-31 | 2023-07-31 | Device and method for self-calibrating time delay of transmission channel of long-wave transmitter |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117156544A (en) * | 2023-10-30 | 2023-12-01 | 为准（北京）电子科技有限公司 | Circuit capable of adjusting radio frequency signal time delay and communication device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117156544A (en) * | 2023-10-30 | 2023-12-01 | 为准（北京）电子科技有限公司 | Circuit capable of adjusting radio frequency signal time delay and communication device |
| CN117156544B (en) * | 2023-10-30 | 2023-12-29 | 为准（北京）电子科技有限公司 | Circuit capable of adjusting radio frequency signal time delay and communication device |
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