CN202631729U

CN202631729U - Synchronous control system for double/multi-base radars based on global positioning system (GPS)

Info

Publication number: CN202631729U
Application number: CN 201220296548
Authority: CN
Inventors: 陈泽宗; 李雨钟; 陈曦; 赵晨
Original assignee: Wuhan University WHU
Current assignee: Wuhan University WHU
Priority date: 2012-06-25
Filing date: 2012-06-25
Publication date: 2012-12-26
Anticipated expiration: 2022-06-25

Abstract

The utility model provides a synchronous control system for double/multi-base radars based on a global positioning system (GPS). The system is applied to double/multi-base high-frequency ground wave radars and can output a radar synchronous pulse signal, so that the synchronism in a single-base-radar system can be guaranteed, and the synchronism between different base radars can be guaranteed through a GPS satellite signal. The synchronous control system comprises a GPS antenna, a personal computer (PC), a synchronous controller, a GPS clock source and an LXI protocol interface, wherein the GPS antenna is connected with the GPS clock source; the output of the GPS clock source is connected with the PC and the synchronous controller respectively; and the LXI protocol interface is connected with the PC and the synchronous controller respectively. By adopting LXI protocol communication, the synchronous control system is conveniently and remotely controlled; based on clock synchronism of a GPS satellite, the synchronous control system is low in cost and high in synchronism precision; and the working parameters of the radars can be set flexibly.

Description

Two multistatic radar synchronous control systems based on GPS

Technical field

The utility model belongs to radar synchronous control technique field, particularly a kind of two multistatic radar synchronous control systems based on GPS.

Background technology

High-frequency ground wave radar has original advantage on marine environmental monitoring, can implement, large tracts of land remote to the ocean and round-the-clock real-time monitoring, marine physics key elements such as probe wind, wave, stream simultaneously; Its measuring accuracy is high, monitoring area is big, and than other hi-tech monitoring equipment small investments; In addition, high-frequency ground wave radar can be surveyed the aircraft of low-latitude flying when surveying sea-surface target, thereby important use and great potential are militarily also arranged.

The double/multiple base high-frequency ground wave radar is on the basis of traditional high-frequency ground wave radar; Utilize existing radar website or increase one or more receiving and sending equipments, on a large scale, form radar netting, can overcome the detection blind area of single station high-frequency ground wave radar; Enlarge common overlay area; Improve the measurement performance of single portion system for high-frequency earth wave radar, enrich the measurement data of ocean surface parameter, and can improve multiobject detection in sea and tracking accuracy.The signal of a cell site can be received by a plurality of receiving stations simultaneously; Same receiving station also can obtain the signal from different cell sites different frequency simultaneously; Made full use of limited electromagnetic-energy; Realize multiple-input and multiple-output (MIMO) mode of operation, the work schedule that therefore requires to be between the high-frequency ground wave radar of diverse geographic location must keep strict synchronism.

At present, the synchronous main method of double/multiple base radar system has: based on the time synchronized of Ethernet, based on radio navigation system synchronously, utilize the microwave number transmit realization time and phase-locking, based on the method for synchronous of satellite TV signal; Wherein the method for synchronizing time based on Ethernet needs the network facilities; Method for synchronous based on radio navigation system has required distance, outside the radio navigation system service area, then can't work; Microwave is very fast at the propagation attenuation on sea, and rectilinear propagation is apart from number 10km, and the double/multiple base high-frequency ground wave radar is general at a distance of about 100km, so the method for synchronization that passes based on the microwave number also is not suitable in the double/multiple base high-frequency ground wave radar, using; Though simple based on the method for synchronous of satellite TV signal, temporal information can not be provided, be not truly synchronously.

The utility model content

To the problem that background technology exists, the utility model provides a kind of two multistatic radar synchronous control systems based on GPS.

For solving the problems of the technologies described above, the utility model adopts following technical scheme.

A kind of two multistatic radar synchronous control systems based on GPS comprise gps antenna, PC, isochronous controller, gps clock source, LXI protocol interface; Gps antenna links to each other with the gps clock source; The output in gps clock source links to each other with PC, isochronous controller respectively; The LXI protocol interface links to each other with PC, isochronous controller respectively.

Said isochronous controller comprises that level transferring chip, dual port RAM, ATmega128 single-chip microcomputer, delayed startup module, parameter are provided with module, synchronizing pulse generation module, DDS chip communication module; Wherein, Gps clock source, level transferring chip, ATmega128 single-chip microcomputer link to each other successively; LXI protocol interface, dual port RAM, ATmega128 single-chip microcomputer link to each other successively; The output that the I/O mouth of ATmega128 single-chip microcomputer, gps clock source, parameter are provided with module links to each other with the input of delayed startup module respectively; The data port of ATmega128 single-chip microcomputer links to each other with the input that parameter is provided with module, and parameter is provided with the output of module, the output of synchronizing pulse generation module links to each other with the input of DDS chip communication module respectively, and the output of delayed startup module links to each other with the input of synchronizing pulse generation module.

The model in described gps clock source is HJ5436A-IV.

During use, the synchronizing pulse generation module in the isochronous controller connects respectively at radar system, DDS frequency synthesizer, and DDS chip communication module is connected with the DDS frequency synthesizer; Radar system is two many bases high-frequency ground wave radars, and the DDS frequency synthesizer adopts the AD9910 chip as its core.

Compared with prior art, the utlity model has following advantage and beneficial effect:

1, the utility model adopts the LXI agreement based on network interface to transmit the radar system parameter instruction that PC is assigned, and can realize the remote control on the network, and convenient and reliable, adaptability is strong.

2, the radar running parameter in the utility model is like transponder pulse cycle, dutycycle, pressure earthwave, frequency of operation, that bandwidth of operation can be provided with and generate precision flexibly is very high, in radar running and debugging, has very strong operability and extendability.

3, this clock information that uses novel employing gps satellite is as the synchronous time reference of radar, and cost is low, and exploitation is convenient, and synchronization accuracy is high, can reach 50ns.

Description of drawings

Fig. 1 is the simple structure synoptic diagram of the utility model.

Fig. 2 is the concrete structure synoptic diagram of the utility model.

Wherein, 1-gps antenna, 2-gps clock source, 3-PC; 4-LXI protocol interface, 5-isochronous controller, 6-level transferring chip, 7-dual port RAM; 8-ATmega128 single-chip microcomputer, 9-FPGA, 10-delayed startup module, 11-synchronizing pulse generation module; 12-parameter is provided with module, 13-DDS chip communication module, 14-radar system, 15-DDS frequency synthesizer.

Embodiment

Below in conjunction with embodiment shown in the drawings the utility model is described further.

Shown in accompanying drawing, the utility model comprises gps antenna 1, PC 3, isochronous controller 5, gps clock source 2, LXI protocol interface 4; Gps antenna 1 links to each other with gps clock source 2; The output in gps clock source 2 links to each other with PC 3, isochronous controller 5 respectively; LXI protocol interface 4 links to each other with PC 3, isochronous controller 5 respectively.

Isochronous controller 5 comprises that level transferring chip 6, dual port RAM 7, ATmega128 single-chip microcomputer 8, delayed startup module 10, parameter are provided with module 12, synchronizing pulse generation module 11, DDS chip communication module 13; Wherein, Gps clock source 2, level transferring chip 6, ATmega128 single-chip microcomputer 8 link to each other successively; LXI protocol interface 4, dual port RAM 7, ATmega128 single-chip microcomputer 8 link to each other successively; The output that the I/O mouth of ATmega128 single-chip microcomputer 8, gps clock source 2, parameter are provided with module 12 links to each other with the input of delayed startup module 10 respectively; The data port of ATmega128 single-chip microcomputer 8 links to each other with the input that parameter is provided with module 12, and parameter is provided with the output of module 12, the output of synchronizing pulse generation module 11 links to each other with the input of DDS chip communication module 13 respectively, and the output of delayed startup module 10 links to each other with the input of synchronizing pulse generation module 11; The model in gps clock source 2 is HJ5436A-IV in the present embodiment.

During use, the synchronizing pulse generation module 11 in the isochronous controller 5 is connected with radar system 14, DDS frequency synthesizer 15 respectively, and DDS chip communication module 13 is connected with DDS frequency synthesizer 15; Radar system is two many bases high-frequency ground wave radars, and the DDS frequency synthesizer adopts the AD9910 chip as its core.

Each associated components of monostatic radar systems 14 inside under the synchronizing pulse work wave that isochronous controller 5 produces in the present embodiment will be transferred to; Guarantee the synchronous operation of radar system 14 inside; Can pass to radar transmitter like transponder pulse, press ground wave impulse meeting to pass to radar receiver etc.

The job step of the utility model is following:

1. PC 3 is assigned initialization directive, subsidiary corresponding work parameter in the instruction, and LXI protocol interface 4 is passed to ATmega128 single-chip microcomputer 8 with initialization directive and corresponding work parameter through dual port RAM 7.

2. ATmega128 is provided with module 12 through the 8-bit data port with the parameter that running parameter deposits FPGA9 in.

3. PC 3 is assigned enabled instruction according to the current UTC time that receives from serial ports, in the instruction subsidiary start-up time parameter, LXI protocol interface (4) with enabled instruction and corresponding start-up time parameter pass to ATmega128 single-chip microcomputer 8 through dual port RAM 7.

4. ATmega128 single-chip microcomputer 8 receives the UTC time of transmitting from gps clock source 2 through serial ports; And make comparisons with the start-up time of the start-up time that receives from PC 3 parameter; When the UTC time mated with preset start-up time, assign enabled instruction and the parameter that the delayed startup parameter in the start-up time parameter is imported FPGA9 into is provided with module 12 to delayed startup module 10.

5. after delayed startup module 10 is received enabled instruction; Begin to wait for the triggering of next PPS pulse per second (PPS); When PPS pulse per second (PPS) rising edge arrives; The delayed startup parameter that is provided with in the module 12 according to parameter starts time-delay accordingly, and is starting time-delay end back to the 11 transmission enabled instructions of synchronizing pulse generation module.

6. after synchronizing pulse generation module 11 was received enabled instruction, the running parameter that is provided with in the module 12 according to parameter generated the corresponding synchronous pulse.

7. DDS chip communication module 13 is received the synchronizing sub-frame pulse that synchronizing pulse generation module 11 produces; And DDS frequency synthesizer 15 is controlled according to the DDS controlled variable that parameter is provided with in the module 12; Make DDS frequency synthesizer 15 produce corresponding analog fm signal; So far, radar is started working.

8. PC 3 is assigned halt instruction; LXI protocol interface 4 is passed to ATmega128 single-chip microcomputer 8 with halt instruction through dual port RAM 7, and ATmega128 single-chip microcomputer 8 is assigned halt instruction through the I/O mouth to delayed startup module 10, after delayed startup module 10 is received halt instruction; Assign halt instruction to synchronizing pulse generation module 11; Synchronizing pulse stops to produce, and then 13 pairs of DDS frequency synthesizers 15 of DDS chip communication module assign reset instruction, and analog fm signal also stops thereupon.

Claims

1. the two multistatic radar synchronous control systems based on GPS comprise gps antenna, PC, isochronous controller, it is characterized in that: also comprise gps clock source, LXI protocol interface; Gps antenna links to each other with the gps clock source; The output in gps clock source links to each other with PC, isochronous controller respectively; The LXI protocol interface links to each other with PC, isochronous controller respectively.

2. the two multistatic radar synchronous control systems based on GPS according to claim 1 is characterized in that: said isochronous controller comprises that level transferring chip, dual port RAM, ATmega128 single-chip microcomputer, delayed startup module, parameter are provided with module, synchronizing pulse generation module, DDS chip communication module; Wherein, Gps clock source, level transferring chip, ATmega128 single-chip microcomputer link to each other successively; LXI protocol interface, dual port RAM, ATmega128 single-chip microcomputer link to each other successively; The output that the I/O mouth of ATmega128 single-chip microcomputer, gps clock source, parameter are provided with module links to each other with the input of delayed startup module respectively; The data port of ATmega128 single-chip microcomputer links to each other with the input that parameter is provided with module, and parameter is provided with the output of module, the output of synchronizing pulse generation module links to each other with the input of DDS chip communication module respectively, and the output of delayed startup module links to each other with the input of synchronizing pulse generation module.

3. the two multistatic radar synchronous control systems based on GPS according to claim 1 and 2, it is characterized in that: the model in described gps clock source is HJ5436A-IV.