CN104052524A - GPS-assisted fast frequency hopping synchronization method - Google Patents
GPS-assisted fast frequency hopping synchronization method Download PDFInfo
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- CN104052524A CN104052524A CN201410313891.6A CN201410313891A CN104052524A CN 104052524 A CN104052524 A CN 104052524A CN 201410313891 A CN201410313891 A CN 201410313891A CN 104052524 A CN104052524 A CN 104052524A
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Abstract
The invention discloses a GPS-assisted fast frequency hopping synchronization method. The method includes the steps of firstly building an accurate relation between frequency hopping sequences and time information; then fast calculating the state of the frequency hopping sequences at the current moment according to high-precision second pulses and other time information provided with a GPS, wherein the error range can be controlled to be within a quite small scope under the condition that the state of the frequency hopping sequences is controlled by the high-precision pulses per second; finally achieving accurate sequence synchronization with the self-synchronization method. By means of the GPS-assisted fast frequency hopping synchronization method, according to tactic and technological requirements of a frequency hopping communication system in practical application, rapid synchronization of a frequency hopping system is achieved for the long-period frequency hopping sequences, contradictions between the lengths of the frequency hopping sequences and synchronization time are effectively solved, and the synchronization time of frequency hopping signals is shortened on the premise that signal hidden performance is not damaged.
Description
Technical field
The present invention relates to the Fast synchronization of high-speed frequency-hopping (FH, Frequency-Hopping) system, the frequency hop sequences code cycle that especially adopted is very long, and needs again the tactics frequency-hopping system of Fast synchronization.The speed code that can be applicable to frequency-hopping system is synchronous.
Background technology
Frequency hop sequences be synchronously the key issue that frequency-hopping communication system need to solve.Conventional independent channel method, synchronous prefix method etc., have obvious signal characteristic, reliability and disguised poor.The lock in time that common self-synchronizing method needs is long.Under Complicated Electromagnetic Environment in Battlefield, the reliability of frequency-hopping system, Fast synchronization disguised and Frequency Hopping Signal are conflicts, frequency-hopping communication system should be synchronous fast, can have again higher reliability with disguised, and existing technological means is all difficult to meet this demand.From feature and the synchrone mechanism of Frequency Hopping Signal, meet this demand and be exactly will be when not increasing extra fixed signal, under the prerequisite of frequency domain character, obtain fast the state of current frequency hop sequences according to temporal information.Not yet retrieve at present the method for the above-mentioned difficult problem of comparatively general and effective solution.
Summary of the invention
The object of the invention is to design a kind of temporal information of utilizing and carry out fast the synchronous method of frequency hop sequences, the method can be taken into account the requirement of Fast synchronization and the signal highly concealed type of long period frequency hop sequences, reduces the synchronous time of frequency hopping under the condition of highly concealed type.
Technical scheme of the present invention is: 1, first frequency hop sequences and temporal information foundation are contacted accurately; 2, then utilize high-precision pulse per second (PPS) that gps system provides and information At All Other Times, calculate fast the state of the frequency hop sequences of current time, and the state of frequency hop sequences error range under the control of high-precision pulse per second (PPS) can be controlled in quite little scope; 3, finally recycle self-synchronizing method, realize accurate sequence synchronous.
Step 1: utilize GPS module B code to obtain the precise time information of current time
Time unite that the form with B code provides information by GPS module.The temporal information of having carried day Hour Minute Second in time frame of B code, the structure of frame head is two continuous index marker code elements, wherein the rising edge of second index marker code element is zero point second of entrained time of this frame.Final output precise time information and pps pulse per second signal.
Step 2: calculate pseudo random sequence number of state indexes corresponding to current time
Supposing zero is the initial condition of pseudo random sequence constantly, that is the 0th pseudo random sequence state, utilizes the mapping relations of time and pseudo random sequence state, can extrapolate the number of state indexes of the pseudo random sequence that current time is corresponding.First by temporal information
a sky Hour Minute Second value be converted to pseudo random sequence number of state indexes
(state of each m sequence is referred to as a chip).If
be expressed as
my god
time
minute
second:
（1）
Step 3: state value corresponding to current time that calculates pseudo random sequence
Object is the sequence number of the pseudo random sequence state that goes out according to previous calculations, extrapolates fast the state value of corresponding pseudo random sequence.The present invention, for reducing the time of calculating, adopts storage and calculates real-time the method combining.First by whole frequency hop sequences segmentation, the first state value of section corresponding to every section of sequence after a memory segment, recursion is out in real time fast by the first corresponding state value of this section of section for other state in each section.
In specific implementation, first calculate the pseudo random sequence number of state indexes that current time is corresponding
the sequence number of relativity shift in corresponding segment number S and section
after, suppose that the length of each section is
:
（2）
Then table look-up and obtain the state value of S section, then according to the state value of this section, the generation logic based on pseudo random sequence in FPGA, utilizes high-frequency clock to calculate fast relativity shift
pseudo random sequence state value corresponding to current time.
Step 4: adopt self-synchronizing method to realize the precise synchronization of Frequency Hopping Signal
After calculating the state value of the pseudo random sequence generator that current time is corresponding, take pps pulse per second signal as time reference, in certain scope of several milliseconds, adopt the self-synchronizing method of Frequency Hopping Signal routine to realize catching and following the tracks of of frequency hop sequences, to realize the precise synchronization of Frequency Hopping Signal.
Based on the present invention, can realize synchronous fast in ten milliseconds of frequency hop sequences, much smaller than the lock in time of the desired shortwave of GB, ultrashort wave radio set, and method provided by the invention do not need the necessary synchronizing frequency of conventional frequency hopping communications, strengthened the interference free performance of system.
Beneficial effect of the present invention is:
Utilize technical method provided by the invention, under complex electromagnetic environment, according to the frequency-hopping communication system tactics and technique demand of practical application, for macrocyclic frequency hop sequences, realized the Fast synchronization of frequency-hopping system, efficiently solve frequency hop sequences length and the contradiction between lock in time, do not destroying the lock in time of having reduced Frequency Hopping Signal under the concealed prerequisite of signal.
Accompanying drawing explanation
Fig. 1 is the cheap several flow charts of the current corresponding chip of time statistics according to GPS;
Fig. 2 is for calculating current frequency hop sequences state flow chart;
Fig. 3 is for calculating accurate local synchronization sequence flow figure.
Embodiment
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described in further detail.
The B code that Fig. 1 provides for first utilizing GPS module, calculates current precise time information
, and extract pps pulse per second signal, then calculate the chip sequence number corresponding to the relative initial time of frequency hop sequences of current time, i.e. the chip offset number of relative initial time
.
Fig. 2 is the chip sequence number corresponding according to current time
, the initial condition of calculating frequency hop sequences generation module.The cycle of frequency hop sequences is very long, is difficult to by memory cell pre-stored.The present invention, by whole frequency hop sequences segmentation, only stores every section of initial condition value that sequence paragraph header is corresponding.Obtain under the prerequisite of the initial condition value that paragraph header is corresponding tabling look-up, the state value constantly of each in section adopts high-frequency clock to calculate in real time.
Fig. 3 be calculate the frequency hop sequences state that current time is corresponding after, by self-synchronizing method precise search and the frequency hop sequences that receives signal and synchronize among a small circle.The size of scope of search and the accuracy of the temporal information that GPS provides, the two electricity ripple propagation delays of transmitting-receiving, and the inherent delay of transceiver is relevant.
Claims (2)
1. the auxiliary fast frequency-hopped synchronous method of GPS, is characterized in that, first frequency hop sequences and temporal information foundation is contacted accurately; Then utilize high-precision pulse per second (PPS) that gps system provides and information At All Other Times, calculate the state of the frequency hop sequences of current time; 3, finally recycle self-synchronizing method, realize accurate sequence synchronous; Concrete steps are as follows:
Step 1: utilize GPS module B code to obtain the precise time information of current time
Time unite that the form with B code provides information by GPS module, in time frame of B code, carried the temporal information of day Hour Minute Second, the structure of frame head is two continuous index marker code elements, wherein the rising edge of second index marker code element is zero point second of entrained time of this frame, finally exports precise time information and pps pulse per second signal;
Step 2: calculate pseudo random sequence number of state indexes corresponding to current time
Supposing zero is the initial condition of pseudo random sequence constantly, that is the 0th pseudo random sequence state, utilizes the mapping relations of time and pseudo random sequence state, can extrapolate the number of state indexes of the pseudo random sequence that current time is corresponding, first by temporal information
a sky Hour Minute Second value be converted to pseudo random sequence number of state indexes
, the state of each m sequence is referred to as a chip, establishes
be expressed as
my god
time
minute
second:
（1）
Step 3: state value corresponding to current time that calculates pseudo random sequence
The sequence number of the pseudo random sequence state going out according to previous calculations, extrapolate the state value of corresponding pseudo random sequence, adopt storage and calculate real-time the method combining, first by whole frequency hop sequences segmentation, the first state value of section corresponding to every section of sequence after memory segment, other state in each section is by the first corresponding real-time recursion of state value of this section of section out;
Step 4: adopt self-synchronizing method to realize the precise synchronization of Frequency Hopping Signal
After calculating the state value of the pseudo random sequence generator that current time is corresponding, take pps pulse per second signal as time reference, in the scope of several milliseconds, adopt Frequency Hopping Signal self-synchronizing method to realize catching and following the tracks of of frequency hop sequences, to realize the precise synchronization of Frequency Hopping Signal.
2. the auxiliary fast frequency-hopped synchronous method of a kind of GPS according to claim 1, is characterized in that, the state value corresponding to current time of described calculating pseudo random sequence, is specially:
First calculate the pseudo random sequence number of state indexes that current time is corresponding
the sequence number of relativity shift in corresponding segment number S and section
after, suppose that the length of each section is
:
（2）
Then table look-up and obtain the state value of S section, then according to the state value of this section, the generation logic based on pseudo random sequence in FPGA, utilizes high-frequency clock to calculate fast relativity shift
pseudo random sequence state value corresponding to current time.
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| CN104407529A (en) * | 2014-11-27 | 2015-03-11 | 江西洪都航空工业集团有限责任公司 | Method for realizing time system zero-clock |
| CN105897303A (en) * | 2016-03-23 | 2016-08-24 | 中国电子科技集团公司第十研究所 | Method for reducing synchronization time of frequency-hopping communication |
| CN109445272A (en) * | 2018-10-23 | 2019-03-08 | 全球能源互联网研究院有限公司 | The method and device of clock signal synchronization method, adjustment signal frequency |
| WO2023057845A1 (en) | 2021-10-06 | 2023-04-13 | Sat-Com (Pty) Ltd | Frequency hopping |
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| CN109445272A (en) * | 2018-10-23 | 2019-03-08 | 全球能源互联网研究院有限公司 | The method and device of clock signal synchronization method, adjustment signal frequency |
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| WO2023057845A1 (en) | 2021-10-06 | 2023-04-13 | Sat-Com (Pty) Ltd | Frequency hopping |
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Application publication date: 20140917 |