CN117915448A - High-precision time synchronization method for missile-borne networking data link and data link end machine - Google Patents
High-precision time synchronization method for missile-borne networking data link and data link end machine Download PDFInfo
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- CN117915448A CN117915448A CN202311786528.1A CN202311786528A CN117915448A CN 117915448 A CN117915448 A CN 117915448A CN 202311786528 A CN202311786528 A CN 202311786528A CN 117915448 A CN117915448 A CN 117915448A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Abstract
A high-precision time synchronization method for a missile-borne networking data chain system applies multi-node networking, frequency hopping communication and time synchronization to the missile-borne networking data chain system, improves the synchronization performance of the system by adopting a method combining round trip timing synchronization and frequency compensation, and has the characteristics of low complexity, high precision and low jitter. The method is simple and easy to realize, and is suitable for a low-cost and miniaturized multi-missile-borne node frequency hopping system.
Description
Technical Field
The invention relates to the technical field of data link communication, in particular to a high-precision time synchronization method for an missile-borne networking data link.
Background
The missile-borne networking data link is mainly used for helping missiles to complete the functions of communication, command and accurate guidance and is responsible for transmitting and exchanging target information, environment information and cooperative information. The time of all devices in the network needs to be precisely synchronized, and the time is the premise of consistency and cooperative work among missiles. Therefore, the missile-borne networking data link communication system has higher requirements on the synchronization precision and the jitter size. In particular to a TDMA-based missile-borne networking data link system, which has higher requirement on time synchronization.
A blind estimation algorithm pointed out by an anti-frequency offset timing synchronization method and performance analysis in the prior art comprises maximum likelihood timing estimation, non-decision-oriented timing estimation and the like, has the characteristics of high cost, low precision, large volume, difficult integration and the like, and is not suitable for the requirements of low cost and miniaturization of a missile-borne data chain.
In the second prior art, the tactical data chain high-precision time synchronization based on differential GPS indicates that the time reference of time synchronization is derived from GPS receiver time service of a platform, after GPS differential processing, more accurate time synchronization observables can be provided, and a time synchronization calculation algorithm model is constructed by utilizing Kalman filtering, so that high-precision time synchronization is realized. The technology improves the time synchronization precision to a certain extent, but has high algorithm complexity and high requirement on hardware by a time reference, and is not suitable for the requirements of low cost and miniaturization of a missile-borne data chain.
In the third prior art, a high-precision time synchronization algorithm of a very high frequency narrow band communication system indicates that a plurality of groups of repeated short training sequences are used as related sequences at a transmitting end by combining a packet training sequence method and a least square fitting method, and signals are transmitted in a specific frame format; and carrying out delay sliding correlation accumulation on the local training sequence and the sampling signal sequence at the receiving end to obtain initial synchronization time, correcting the initial synchronization time according to a linear equation obtained by least square fitting, and obtaining high-precision synchronization time. But the algorithm needs to be further optimized in engineering practice, which is unfavorable for engineering application.
Disclosure of Invention
The high-precision time synchronization method for the missile-borne networking data link can ensure the normal operation of a system in a multi-user use scene, and has the characteristics of low cost, miniaturization, low delay, quick networking, multi-user support and the like.
The specific technical scheme is as follows:
1. Compared with the traditional missile-borne data link communication system with fewer points or nodes, the method is suitable for the frequency hopping networking data links of multiple nodes, and each terminal node allocates a shared channel according to time slots by adopting a TDD system and a TMDA networking mode. Aiming at data exchange among missiles and between the missiles and the ground platform, the method realizes information transmission exchange and processing, and helps the missiles to complete functions of communication, command, accurate guidance and the like.
2. In the missile-borne data chain system, a round trip timing synchronization method is adopted to realize time information synchronization among nodes of a data chain, and a synchronization node (hereinafter referred to as a slave node) and a time reference node (hereinafter referred to as a master node) are in a stable synchronization state of a clock after fine synchronization;
in order to maintain accurate synchronization of system time, the phase difference estimation frequency deviation is further adopted to compensate the local clock, so that high-precision time synchronization of each node is realized, and time synchronization and frequency hopping synchronization based on the TDMA system are ensured.
The method improves the synchronization performance of the system, has the characteristics of low complexity, high precision and low jitter, and meets the requirements of low cost and miniaturization of the DZ data link.
Compared with the prior art, the beneficial effects of the present disclosure are: (1) The method is suitable for a frequency hopping system with multiple missile-borne nodes, and has high time synchronization precision and low algorithm complexity; (2) The time slot allocation is flexible, and the time slot allocation can be configured in real time according to actual use; (3) And the influence of clock drift on a system receiving and transmitting terminal is eliminated, and the time jitter error is reduced.
Drawings
The foregoing and other objects, features and advantages of the disclosure will be apparent from the following more particular descriptions of exemplary embodiments of the disclosure as illustrated in the accompanying drawings wherein like reference numbers generally represent like parts throughout the exemplary embodiments of the disclosure.
FIG. 1 is a schematic diagram of a data link end machine of a high precision time synchronization system for a missile-borne networking data link in accordance with the present disclosure;
fig. 2 is an exemplary communication slot allocation diagram, (a) system communication slot allocation diagram, (b) timing slot allocation diagram;
Fig. 3 is a single-node time synchronization flow diagram according to the present disclosure.
Detailed Description
Preferred embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While the preferred embodiments of the present disclosure are illustrated in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.
The present disclosure provides a high precision time synchronization method for a missile-borne networking data link system, which reasonably plans time slots, and adopts an algorithm of round trip time synchronization and clock frequency compensation to realize high precision time synchronization so as to ensure time synchronization and frequency hopping synchronization based on a TDMA system.
In an exemplary embodiment, the missile-borne networking data link adopting the method disclosed by the disclosure adopts a TDD system and a TMDA networking mode, and each terminal node allocates a shared channel according to the time slot. Taking 36 nodes with a communication distance of 15km as an example, the communication time slots are shown in fig. 2, wherein:
the 1 super frame contains 36 time elements, which respectively correspond to 36 nodes (without the ground end), and the 1 time elements are divided into 4 types of time slots, namely TF1 to TF4.TF1 completes time synchronization and network maintenance of appointed nodes; the TF2 time slot realizes the uploading of uplink control instructions; the TF3 time slot can bear 36 DZ end business data (uplink and downlink) at maximum; TF4 timeslots carry video traffic.
The transmission guard interval is suitably greater than twice the transmission delay (15 km transmission delay of 49.5 us) taking into account end-to-end transmission delay, including multipath and other factors.
Wherein the timing slot allocation is as shown in fig. 2 (b).
On this basis, the single-node time synchronization step is shown in fig. 3, and comprises the following steps:
Step1, adopting a fixed frequency hopping sequence, mainly sending synchronous information in a fixed time slot, wherein the synchronous information carries time information of a main node, and the time element carries out synchronous node numbers;
Step 2, receiving the synchronous information from the signal detection, analyzing the synchronous information, judging whether the local node is consistent with the synchronous node number, if so, then transmitting RTT (round trip delay) request information in the synchronous time slot, wherein the synchronous information carries the transmission time T1 of the request frame;
step 3, if the master receives the request information, records the receiving time T2, transmits RTT response in a specified time slot, and records the transmitting time T3;
and 4, receiving the RTT response, recording the receiving time T4, extracting the time T2 and the time T3 from the RTT response frame, calculating the clock difference according to the RTT information of the RTT response frame, compensating the local clock, and completing the time synchronization between the master and the slave according to the calculation formula.
△T＝(T2+T3-T1-T4)/2
In addition, in order to eliminate the influence of clock drift on the system receiving and transmitting terminal, the local clock can be compensated according to the phase difference estimation frequency deviation, so that the initial frequency drift and the drift are close to zero, and the time difference meets the precision requirement.
And updating the synchronous node number, and repeating the steps 1 to 4 to realize time synchronization of all nodes in the network.
Therefore, the time synchronization method of the low-overhead multi-node applies multi-node networking, frequency hopping communication and time synchronization to the missile-borne networking data link system, and improves the synchronization performance of the system by adopting a method of combining round trip timing synchronization and frequency compensation, and has the characteristics of low complexity, high precision and low jitter.
The high-precision time synchronization system data link end machine of the missile-borne networking data link applying the method comprises the following steps: an exemplary embodiment of an antenna unit, a radio frequency channel unit, and a baseband unit is shown in fig. 1. Wherein:
The antenna adopts an omnidirectional antenna, and adopts a wide-transmitting and wide-receiving mode to transmit and receive communication.
The radio frequency channel unit comprises 1 transmitting channel and 1 receiving channel, wherein the transmitting channel is used for amplifying output signals and outputting radio frequency signals meeting the transmission index requirements; the receiving channel is used for filtering and gain controlling the received signal.
The baseband unit includes: CX9261S agile transceiver and FPGA digital signal processor. CX9261S adopts a direct frequency conversion architecture, consists of a low noise amplifier, a mixer, a programmable gain amplifier, a bandwidth variable filter and a high-speed high-precision ADC, has rapid frequency hopping capability, and meets the frequency hopping design requirement of a data chain system; the FPGA processor is used for designing a transmitter, a receiver, frequency hopping synchronization and time synchronization, and realizing high-precision time synchronization of the missile-borne frequency hopping networking data chain.
The foregoing technical solutions are merely exemplary embodiments of the present invention, and various modifications and variations can be easily made by those skilled in the art based on the application methods and principles disclosed in the present invention, not limited to the methods described in the foregoing specific embodiments of the present invention, so that the foregoing description is only preferred and not in a limiting sense.
Claims (6)
1. A high-precision time synchronization method for a missile-borne networking data link comprises the following steps:
S1, time slot allocation is carried out on each terminal node to share a channel, wherein each time element comprises 1 time correction time slot which is used for carrying out rough synchronization on all nodes and carrying out fine synchronization on designated nodes, and the time correction time slots comprise: a synchronous information sending time slot, an RTT request sending time slot, an RTT response sending time slot and a protection time slot;
s2, a fixed frequency hopping sequence is adopted, a time reference node, namely a master node, sends synchronization information in a time correction time slot, the synchronization information carries master node time information, and slave node numbers of the time element are precisely synchronized;
s3, after receiving the synchronous information, the corresponding slave node sends RTT request information in the synchronous time slot, wherein the RTT request information comprises the sending time T1 of the request frame;
S4, the master node receives the request information, records the receiving time T2, transmits RTT response in a specified time slot, and records the transmitting time T3;
S5, receiving RTT response from the node, recording receiving time T4, extracting time T2 and time T3 from the RTT response frame, calculating clock difference according to T1-T4 to compensate local clock, and completing time synchronization between the master node and the slave node;
And S6, updating the number of the synchronous node, repeating the steps S2-S5, and completing time synchronization of all nodes in the network.
2. The method according to claim 1, wherein in the step S5, the formula for calculating the clock difference according to T1 to T4 is as follows:
△T＝(T2+T3-T1-T4)/2。
3. the method according to claim 1 or 2, wherein the method for slot allocation in step S1 comprises: the method comprises the steps that n nodes are arranged, a ground terminal is not contained, and 1 superframe comprises n time elements;
1 time element, namely 1 time slot period, wherein the time slot comprises at least 3 types of time slots which are respectively TF1 to TF3, and the time slots comprise:
TF1 is time-correcting time slot, and the time synchronization and network maintenance of the designated node are completed;
The TF2 time slot realizes the uploading of uplink control instructions;
the TF3 time slot can bear the service data of n missile-borne terminals at maximum;
Wherein, the timing time slot again includes: synchronization information transmission time slot, RTT request transmission time slot, RTT response transmission time slot, and protection time slot.
4. The method according to claim 1, wherein the step S5 further comprises:
The local clock is compensated according to the phase difference estimated frequency deviation, so that the initial frequency drift and the clock drift are close to zero.
5. An airborne networking data link high precision time synchronization system data link end machine employing the method of any one of claims 1-4, comprising: an antenna unit, a radio frequency channel unit and a baseband unit;
the antenna adopts an omnidirectional antenna and adopts a wide-transmitting and wide-receiving mode to transmit and receive communication;
The radio frequency channel unit comprises 1 transmitting channel and 1 receiving channel, wherein the transmitting channel is used for amplifying output signals and outputting radio frequency signals meeting the transmission index requirements; the receiving channel is used for filtering and gain controlling the received signal.
The baseband unit comprises a frequency agility transceiver and an FPGA digital signal processor, wherein the frequency agility transceiver has rapid frequency hopping capability and meets the frequency hopping design requirement of a data link system; the FPGA processor is used for designing a transmitter, a receiver, frequency hopping synchronization and time synchronization, and realizing high-precision time synchronization of the missile-borne frequency hopping networking data chain.
6. The data link end machine of claim 5, wherein the agile transceiver employs a direct conversion architecture comprising a low noise amplifier, a mixer, a programmable gain amplifier, a variable bandwidth filter, and a high speed high precision ADC.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202311786528.1A CN117915448A (en) | 2023-12-25 | 2023-12-25 | High-precision time synchronization method for missile-borne networking data link and data link end machine |
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| CN202311786528.1A CN117915448A (en) | 2023-12-25 | 2023-12-25 | High-precision time synchronization method for missile-borne networking data link and data link end machine |
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