CN106443711A - Method for adjusting transmission channel time delay of satellite navigation digital multi-beam system - Google Patents

Method for adjusting transmission channel time delay of satellite navigation digital multi-beam system Download PDF

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CN106443711A
CN106443711A CN201611079831.8A CN201611079831A CN106443711A CN 106443711 A CN106443711 A CN 106443711A CN 201611079831 A CN201611079831 A CN 201611079831A CN 106443711 A CN106443711 A CN 106443711A
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time delay
transmission channel
adjustment
pseudo
adjustment amount
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CN106443711B (en
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韩双林
尹继凯
李刚
董立桥
王跃
翟江鹏
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CETC 54 Research Institute
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S19/00—Satellite radio beacon positioning systems; Determining position, velocity or attitude using signals transmitted by such systems
    • G01S19/01—Satellite radio beacon positioning systems transmitting time-stamped messages, e.g. GPS [Global Positioning System], GLONASS [Global Orbiting Navigation Satellite System] or GALILEO
    • G01S19/02—Details of the space or ground control segments

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  • Engineering & Computer Science (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Remote Sensing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Stabilization Of Oscillater, Synchronisation, Frequency Synthesizers (AREA)
  • Variable-Direction Aerials And Aerial Arrays (AREA)

Abstract

The invention discloses a method for adjusting the transmission channel time delay of a satellite navigation digital multi-beam system. The method comprises the following steps: measuring a transmission channel time delay value; calculating a time delay error; judging whether adjustment is needed according to the time delay error; if adjustment is finished or not needed, preparing for time delay adjustment of the next channel; otherwise, calculating the time delay adjustment amount according to the time delay error; performing coarse adjustment of the time delay; and performing fine adjustment of the time delay and preparing for time delay adjustment of the next channel. High-precision adjustment of a pseudo code clock and a second synchronization pulse is realized by controlling the phase control word of the internal DDS of a transmission terminal so as to quickly and accurately adjust the transmission channel time delay of the multi-beam system, and automatic adjustment of the time delay of multiple transmission channels can be realized under software control.

Description

The method of adjustment of satellite navigation digital multiple beam system transmission channel time delay
Technical field
The present invention relates to the time delay adjusting method of transmission channel.Satellite navigation digital multiple beam emission system has simultaneously Up function of injecting is carried out to multi-satellite.
Background technology
Digital multiple beam emission system combines array antenna and Digital Signal Processing, has simultaneously to multi-satellite Carry out up function of injecting.The baseband signal of digital multiple beam system produces and Beam synthesis are all realized in numeric field, after synthesis Digital signal become analog radio-frequency signal through D/A and up-conversion, through bay radiation, form corresponding ripple in the air Bundle.
Because whole emission system needs multiple transmission channel collaborative works it is desirable to all transmission channel time delays are identical.But In practical application, different interchannel software and hardwares can not possibly completely the same, thus cause interchannel signal time delay inconsistent, continue And affect to synthesize the pointing accuracy of wave beam.Need in engineer applied to control interchannel delay inequality within indication range, because This needs takes steps to transmission channel time delay is adjusted.
Content of the invention
It is an object of the invention to provide a kind of method of adjustment of satellite navigation digital multiple beam system transmission channel time delay； When the method adjusts pulse per second (PPS) and the pseudo-code of inside by the phase control words controlling the internal DDS of digital multiple beam launch terminal Clock, realizes the adjustment of transmission channel time delay；The time delay that this method can be automatically obtained under software to multiple transmission channels is entered Row adjustment.
The technical solution used in the present invention is：
The method of adjustment of satellite navigation digital multiple beam system transmission channel time delay, by controlling digital multiple beam transmitting eventually Pulse per second (PPS) and pseudo-code clock to adjust inside for the phase control words of the internal DDS in end, realizes the adjustment of transmission channel time delay；It is special Levy and be, comprise the following steps：
(101) measure the first of the pseudo-code signal that the pulse per second (PPS) rising edge that in current transmission channel, outside provides is produced with inside The time interval of beginning phase place rising edge, this time interval is the time delay value of current transmission channel；
(102) time delay value according to current transmission channel and benchmark time delay value calculate the time delay error of current transmission channel；
(103) absolute value judging time delay error whether within the error of system requirements, if so, then execution step (104), otherwise execution step (105)；
(104) using next transmission channel as current transmission channel, proceed to step (101)；
(105) preset delay compensation parameter, actually required time delay is calculated according to time delay error and delay compensation parameter and adjusts Whole amount；
(106) coarse adjustment：According to time delay adjustment amount calculation delay coarse adjustment amount and coarse adjustment phase control words, according to coarse adjustment phase place control Word processed synthesizes pulse per second (PPS), using this pulse per second (PPS) as current transmission channel within pulse per second (PPS)；
(107) accurate adjustment：Accurate adjustment phase control words are calculated according to time delay adjustment amount and time delay coarse adjustment amount, according to accurate adjustment phase place control Word processed synthesizes pseudo-code clock, using this pseudo-code clock as current launch terminal within pseudo-code clock；
(108) using next transmission channel as current transmission channel, proceed to step (101), until digital multiple beam transmitting In system, the time delay error of all transmission channels meets system requirements.
Wherein, step (106) is specially：
According to time delay adjustment amount calculation delay coarse adjustment amount t2a：
t2a=t2-mod(t2,Tp),
In formula, t2For actually required time delay adjustment amount, TpFor pseudo-code clock cycle, i.e. minimum chip width, operator Mod represents complementation；
Coarse adjustment phase control words STW_A are calculated according to time delay coarse adjustment amount：
Operator [] represents rounding operation；
With pseudo-code clock as beat, pulse per second (PPS) is synthesized according to coarse adjustment frequency control word and coarse adjustment phase control words, by this second Pulse is as the pulse per second (PPS) within current transmission channel.
Wherein, step (107) is specially：
According to time delay adjustment amount and time delay coarse adjustment amount calculation delay accurate adjustment amount t2b：
t2b=t2-t2a=mod (t2,Tp),
Wherein operator mod represents complementation, TpFor pseudo-code clock cycle, t2For actually required time delay adjustment amount, t2aFor time delay coarse adjustment amount；
According to time delay accurate adjustment amount t2bCalculate accurate adjustment phase control words STW_B；
Wherein NsBit wide for accurate adjustment phase control words STW_B；
With system clock as beat, pseudo-code clock is synthesized according to accurate adjustment frequency control word and accurate adjustment phase control words, should Pseudo-code clock is as the pseudo-code clock within current transmission channel.
Advantage compared with background for the present invention is：
The present invention has the characteristics that Adjustment precision is high.Phase control words bit wide is wider, and Adjustment precision is higher.In code clock frequency For 10,23MHz, when phase control words bit wide is 16bit, Adjustment precision is up to 0.0015ns.
The present invention has the characteristics that adjust automatically.The time delay adjustment of all passages can be automatically performed under the control of the computer, Need not be manually on duty.
Brief description
Fig. 1 is the flow chart of the transmission channel time delay adjusting method of the present invention.
Fig. 2 is the latency measurement principle schematic of the present invention.
Fig. 3 is the time delay coarse adjustment module frame chart of the present invention.
Fig. 4 is the time delay accurate adjustment module frame chart of the present invention.
Specific embodiment
Satellite navigation digital multiple beam system transmission channel time delay adjusting method applicating flow chart of the present invention as shown in figure 1, When the method adjusts pulse per second (PPS) and the pseudo-code of inside by the phase control words controlling the internal DDS of digital multiple beam launch terminal Clock, realizes the adjustment of transmission channel time delay；The time delay that this method can be automatically obtained under software to multiple transmission channels is entered Row adjustment.
Specifically include step as follows：
(101) measure the first of the pseudo-code signal that the pulse per second (PPS) rising edge that in current transmission channel, outside provides is produced with inside The time interval of beginning phase place rising edge, this time interval is the time delay value t of current transmission channel1；Digital multiple beam transmitting is eventually End produces navigation spread-spectrum signal, and navigation spread-spectrum signal includes pseudo-code signal and text, and receiving device receives the navigation spread spectrum of transmitting Signal.Latency measurement principle is as shown in Figure 2.
SYS_1PPS is the pps pulse per second signal that outside time-frequency equipment provides, and is mainly used to internal system equipment be carried out together Step；ACTIVE_PPS is the pps pulse per second signal producing inside launch terminal, ACTIVE_PPS and SYS_ during system worked well 1PPS has fixing phase relation；PN_CLK is pseudo-code clock signal, for driving pseudo-code module to produce pseudo-code signal；PN is Pseudo-code signal；PN initial phase rising edge, PN_CLK rising edge and ACTIVE_PPS rising edge three remain alignment；Currently It to be exactly time interval between SYS_1PPS rising edge and PN initial phase rising edge that the time delay value of transmission channel is actual.
(102) the time delay value t of the current transmission channel according to measurement1With benchmark time delay value t0Calculate current transmission channel Time delay error Δ t；
Time delay error Δ t=t0-t1.Satellite navigation digital multiple beam emission system has multiple transmission channels, and each transmitting is logical The time delay value in road may be different from before adjustment, and the value of benchmark time delay value is considered as making the time delay error of each passage absolute Value is as far as possible little, so that the time delay adjustment of all passages can be completed as early as possible.
(103) absolute value judging time delay error Δ t whether within the error of system requirements, if so, then execution step (104), otherwise execution step (105)；
Time delay alignment error is related to the time delay Adjustment precision of launch terminal and the range accuracy of receiving terminal, by both One side of higher value determines.Typically require in satellite navigation digital multiple beam emission system.
(104) using next transmission channel as current transmission channel, proceed to step (101)；
(105) preset delay compensation parameter, actually required time delay is calculated according to time delay error and delay compensation parameter and adjusts Whole amount t2；
Calculate actually required setting to the time delay adjustment amount t of program2=Δ t+Tb, wherein TbRepresent delay compensation parameter. Receiving terminal measurement pseudorange is to find pseudo-code first phase with outside pulse per second (PPS) SYS_PPS rising edge backward for time reference.If when no Prolong compensation, time delay adjustment amount may be for negative it is meant that pseudo-code first phase rising edge need to shift to an earlier date, and that is, the PN position in Fig. 2 needs to the left Mobile.Pseudo-code first phase rising edge after adjustment is possible to the advanced SYS_PPS rising edge of meeting, the time delay value of such receiving terminal measurement Record on the basis of the SYS_PPS rising edge of really above a second, the time delay value after leading to adjust not only does not reduce, on the contrary Can increase.Therefore increase delay compensation parameter it is ensured that the time delay value of actual setting is always positive number.
(106) the time delay adjustment of chip-level, i.e. coarse adjustment is completed according to time delay adjustment amount；Coarse adjustment is with the code clock cycle as minimum Unit carries out time delay adjustment.Coarse adjustment module diagram is as shown in Figure 3.
Coarse adjustment module essence is DDS (Digital Frequency Synthesize), with pseudo-code clock PN_CLK as beat, according to frequency control word VTW_A, phase control words STW_A synthesis ACTIVE_PPS.Because pseudo-code initial phase rising edge is sent out with ACTIVE_PPS all the time Penetrate the pps pulse per second signal rising edge alignment of terminal inner generation, after ACTIVE_PPS changes, pseudo-code first phase also can accordingly change.Slightly Adjust is exactly to be reached by changing the relativeness between the pps pulse per second signal SYS_1PPS of ACTIVE_PPS and outside time-frequency equipment offer To adjustment pseudo-code initial phase thus changing the purpose of time delay.
Coarse tuning process is as follows：
According to time delay adjustment amount calculation delay coarse adjustment amount t2a：
t2a=t2-mod(t2,Tp),
In formula, t2For actually required time delay adjustment amount, TpFor pseudo-code clock cycle, i.e. minimum chip width, operator Mod represents complementation；
Coarse adjustment phase control words STW_A are calculated according to time delay coarse adjustment amount：
Operator [] represents rounding operation；
With pseudo-code clock as beat, pulse per second (PPS) is synthesized according to coarse adjustment frequency control word and coarse adjustment phase control words, by this second Pulse is as the pulse per second (PPS) within current transmission channel.
(107) accurate adjustment：Accurate adjustment phase control words are calculated according to actually required time delay adjustment amount and time delay coarse adjustment amount, according to Accurate adjustment phase control words synthesize pseudo-code clock, using this pseudo-code clock as current launch terminal within pseudo-code clock；
Complete the time delay adjustment in chip, i.e. accurate adjustment according to time delay adjustment amount, accurate adjustment is to be less than pseudo-code to time delay adjustment amount The part in cycle is adjusted.Accurate adjustment module diagram is as shown in Figure 4.
Accurate adjustment module essence is DDS (Digital Frequency Synthesize), with system clock SYS_CLK as beat, according to accurate adjustment frequency Control word VTW_B, accurate adjustment phase control words STW_B synthesis pseudo-code clock PN_CLK.Because pseudo-code is alignd with code clock, code clock phase place Change pseudo-code phase also can accordingly change.Accurate adjustment is exactly to adjust a yard clock phase place by changing phase control words STW_B, thus arriving Reach the purpose of adjustment pseudo-code first phase.
Accurate adjustment process is as follows：
According to time delay adjustment amount and time delay coarse adjustment amount calculation delay accurate adjustment amount t2b：
t2b=t2-t2a=mod (t2,Tp),
Wherein operator mod represents complementation, TpFor pseudo-code clock cycle, t2For actually required time delay adjustment amount, t2aFor time delay coarse adjustment amount；
According to time delay accurate adjustment amount t2bCalculate accurate adjustment phase control words STW_B；
Wherein NsBit wide for accurate adjustment phase control words STW_B；
With system clock as beat, pseudo-code clock is synthesized according to accurate adjustment frequency control word and accurate adjustment phase control words, should Pseudo-code clock is as the pseudo-code clock within current transmission channel.
Assume that phase control words STW_B bit wide is 16, code clock frequency is 10.23MHz, then time delay Adjustment precision is
STW_B bit wide can require to be adjusted according to time delay Adjustment precision.Bit wide is wider, and Adjustment precision is higher.
(108) using next transmission channel as current transmission channel, proceed to step (101), until digital multiple beam transmitting In terminal, the pulse per second (PPS) of all transmission channels and the adjustment of pseudo-code clock complete.
In addition to the implementation, the present invention can also have other embodiment.All employing equivalents or equivalent transformation shape The technical scheme of formula, all falls within the protection domain of application claims.

Claims (3)

1. the method for adjustment of satellite navigation digital multiple beam system transmission channel time delay, by controlling digital multiple beam launch terminal The phase control words of internal DDS, to adjust pulse per second (PPS) and the pseudo-code clock of inside, realize the adjustment of transmission channel time delay；Its feature It is, comprise the following steps：
(101) measure the initial phase of the pseudo-code signal that the outside pulse per second (PPS) rising edge providing is produced in current transmission channel with inside The time interval of position rising edge, this time interval is the time delay value of current transmission channel；
(102) time delay value according to current transmission channel and benchmark time delay value calculate the time delay error of current transmission channel；
(103) absolute value judging time delay error whether within the error of system requirements, if so, then execution step (104), no Then execution step (105)；
(104) using next transmission channel as current transmission channel, proceed to step (101)；
(105) preset delay compensation parameter, actually required time delay adjustment amount is calculated according to time delay error and delay compensation parameter；
(106) coarse adjustment：According to time delay adjustment amount calculation delay coarse adjustment amount and coarse adjustment phase control words, according to coarse adjustment phase control words Synthesis pulse per second (PPS), using this pulse per second (PPS) as current transmission channel within pulse per second (PPS)；
(107) accurate adjustment：Accurate adjustment phase control words are calculated according to time delay adjustment amount and time delay coarse adjustment amount, according to accurate adjustment phase control words Synthesis pseudo-code clock, using this pseudo-code clock as current launch terminal within pseudo-code clock；
(108) using next transmission channel as current transmission channel, proceed to step (101), until digital multiple beam emission system In the time delay error of all transmission channels meet system requirements.
2. the method for adjustment of satellite navigation digital multiple beam system transmission channel time delay according to claim 1, its feature It is, step (106) is specially：
According to time delay adjustment amount calculation delay coarse adjustment amount t2a：
t2a=t2-mod(t2,Tp),
In formula, t2For actually required time delay adjustment amount, TpFor pseudo-code clock cycle, i.e. minimum chip width, operator mod table Show complementation；
Coarse adjustment phase control words STW_A are calculated according to time delay coarse adjustment amount：
S T W _ A = [ t 2 a T p ] ,
Operator [] represents rounding operation；
With pseudo-code clock as beat, pulse per second (PPS) is synthesized according to coarse adjustment frequency control word and coarse adjustment phase control words, by this pulse per second (PPS) As the pulse per second (PPS) within current transmission channel.
3. the method for adjustment of satellite navigation digital multiple beam system transmission channel time delay according to claim 1, its feature It is, step (107) is specially：
According to time delay adjustment amount and time delay coarse adjustment amount calculation delay accurate adjustment amount t2b：
t2b=t2-t2a=mod (t2,Tp),
Wherein operator mod represents complementation, TpFor pseudo-code clock cycle, t2For actually required time delay adjustment amount, t2aFor when Prolong coarse adjustment amount；
According to time delay accurate adjustment amount t2bCalculate accurate adjustment phase control words STW_B；
S T W _ B = t 2 b × 2 N s ,
Wherein NsBit wide for accurate adjustment phase control words STW_B；
With system clock as beat, pseudo-code clock is synthesized according to accurate adjustment frequency control word and accurate adjustment phase control words, by this pseudo-code Clock is as the pseudo-code clock within current transmission channel.
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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109581310A (en) * 2018-12-14 2019-04-05 湖南华诺星空电子技术有限公司 A kind of time domain impulse radar equivalent sampling time delay calibration method
CN111064533A (en) * 2019-12-25 2020-04-24 上海科梁信息工程股份有限公司 Time delay measurement system, time delay measurement method, electronic device, and storage medium
CN111447031A (en) * 2020-04-02 2020-07-24 桂林电子科技大学 Network-on-chip router structure with clock synchronization function

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103293534A (en) * 2013-05-10 2013-09-11 西安空间无线电技术研究所 Satellite navigation signal generation zero calibration method
US20130293415A1 (en) * 2010-11-18 2013-11-07 The Boeing Company Correcting for time delay variation in a satellite for positioning, navigation or timing applications
JP2014020814A (en) * 2012-07-13 2014-02-03 Lighthouse Technology & Consulting Co Ltd Satellite positioning system and positioning reinforcement signal generation method
CN103592660A (en) * 2013-11-27 2014-02-19 北京无线电计量测试研究所 Satellite navigation signal simulator calibration and timing type receiver delay device and method
CN103916199A (en) * 2014-03-18 2014-07-09 中国科学院国家天文台 Device and method for time delay and phase adjustment of antenna signal
CN105024745A (en) * 2015-05-31 2015-11-04 中国电子科技集团公司第十研究所 Method for adjusting time delays of multiple broadband receiving signals
US9209963B1 (en) * 2014-09-10 2015-12-08 Hughes Network Systems, Llc Numerically controlled oscillator with fine timing adjustment

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20130293415A1 (en) * 2010-11-18 2013-11-07 The Boeing Company Correcting for time delay variation in a satellite for positioning, navigation or timing applications
JP2014020814A (en) * 2012-07-13 2014-02-03 Lighthouse Technology & Consulting Co Ltd Satellite positioning system and positioning reinforcement signal generation method
CN103293534A (en) * 2013-05-10 2013-09-11 西安空间无线电技术研究所 Satellite navigation signal generation zero calibration method
CN103592660A (en) * 2013-11-27 2014-02-19 北京无线电计量测试研究所 Satellite navigation signal simulator calibration and timing type receiver delay device and method
CN103916199A (en) * 2014-03-18 2014-07-09 中国科学院国家天文台 Device and method for time delay and phase adjustment of antenna signal
US9209963B1 (en) * 2014-09-10 2015-12-08 Hughes Network Systems, Llc Numerically controlled oscillator with fine timing adjustment
CN105024745A (en) * 2015-05-31 2015-11-04 中国电子科技集团公司第十研究所 Method for adjusting time delays of multiple broadband receiving signals

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
韩双林等: "数字多波束发射终端的通道一致性研究", 《无线电工程》 *

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109581310A (en) * 2018-12-14 2019-04-05 湖南华诺星空电子技术有限公司 A kind of time domain impulse radar equivalent sampling time delay calibration method
CN109581310B (en) * 2018-12-14 2022-07-01 湖南华诺星空电子技术有限公司 Time domain pulse radar equivalent sampling delay calibration method
CN111064533A (en) * 2019-12-25 2020-04-24 上海科梁信息工程股份有限公司 Time delay measurement system, time delay measurement method, electronic device, and storage medium
CN111064533B (en) * 2019-12-25 2022-04-05 上海科梁信息科技股份有限公司 Time delay measurement system, time delay measurement method, electronic device, and storage medium
CN111447031A (en) * 2020-04-02 2020-07-24 桂林电子科技大学 Network-on-chip router structure with clock synchronization function

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