CN-121984633-A - Radar time-frequency synchronization device and method

Abstract

The embodiment of the invention discloses a radar time-frequency synchronization device and a method. In a specific embodiment, the device comprises an electric signal unit, an optical transceiver unit and an optical transmission unit, wherein the electric signal unit is used for amplifying a first synchronous signal and a first reference signal to obtain a second synchronous signal and a second reference signal, amplifying a third synchronous signal to obtain a fourth synchronous signal, authenticating the third reference signal and the first reference signal to obtain a phase difference signal, the optical transceiver unit is used for converting and combining the second synchronous signal and the second reference signal to obtain a third optical signal, separating and converting the fourth optical signal to obtain the third reference signal and the third synchronous signal, and the optical transmission unit is used for transmitting the third optical signal and adjusting the third optical signal according to the phase difference signal to obtain the fourth optical signal.

Inventors

• ZHANG TENGYUE

Assignees

• 北京无线电测量研究所

Dates

Publication Date

20260505

Application Date

20260212

Claims (10)

1. 1. A radar time-frequency synchronization device, comprising: The electric signal unit is used for amplifying the first synchronous signal and the first reference signal to obtain a second synchronous signal and a second reference signal, amplifying the third synchronous signal to obtain a fourth synchronous signal, and carrying out phase discrimination on the third reference signal and the first reference signal to obtain a phase difference signal; the optical transceiver unit is used for converting and combining the second synchronous signal and the second reference signal to obtain a third optical signal, and separating and converting the fourth optical signal to obtain a third reference signal and a third synchronous signal; And the optical transmission unit is used for transmitting the third optical signal and adjusting the third optical signal according to the phase difference signal to obtain a fourth optical signal.
2. 2. The radar time-frequency synchronization device according to claim 1, wherein, A first input end of the electric signal unit receives the first synchronous signal; a second input end of the electric signal unit receives the first reference signal; a third input end of the electric signal unit receives the first reference signal; The fourth input end of the electric signal unit is connected with the first output end of the optical transceiver unit; The fifth input end of the electric signal unit is connected with the second output end of the optical transceiver unit; the first output end of the electric signal unit is connected with the first input end of the optical transceiver unit; the second output end of the electric signal unit is connected with the second input end of the optical transceiver unit; the third output end of the electric signal unit outputs the fourth synchronous signal; the fourth output end of the electric signal unit is connected with the first input end of the optical transmission unit; The third output end of the optical transceiver unit is connected with the second input end of the optical transmission unit; the third input end of the optical transceiver unit is connected with the output end of the optical transmission unit.
3. 3. The radar time-frequency synchronization device according to claim 2, wherein, The electric signal unit comprises a first signal amplifier, a second signal amplifier, a third signal amplifier and a phase discriminator; The first signal amplifier is used for carrying out power amplification on the first synchronous signal to obtain the second synchronous signal; The second signal amplifier is used for carrying out power amplification on the first reference signal to obtain the second reference signal; the third signal amplifier is configured to power amplify the third synchronization signal to obtain the fourth synchronization signal; the phase discriminator is configured to perform phase discrimination on the third reference signal and the first reference signal to obtain the phase difference signal.
4. 4. A radar time-frequency synchronization device according to claim 3, wherein, The optical transceiver unit comprises a first laser, a second laser, a first wavelength division multiplexer, a first detector, a second detector and a second wavelength division multiplexer; The first laser is used for converting the second synchronous signal into a first optical signal; the second laser is used for converting the second reference signal into a second optical signal; the first wavelength division multiplexer is configured to combine the first optical signal and the second optical signal into the third optical signal; the second wavelength division multiplexer is configured to divide the fourth optical signal into a fifth optical signal and a sixth optical signal; The first detector is used for converting the fifth optical signal into the third reference signal; The second detector is configured to convert the sixth optical signal into the third synchronization signal.
5. 5. The radar time-frequency synchronization device according to claim 4, wherein, The optical transmission unit comprises an optical fiber and an adjustable optical delay line; The optical fiber is used for transmitting the third optical signal; And the adjustable light delay line is used for carrying out phase adjustment on the third optical signal according to the phase difference signal to obtain the fourth optical signal.
6. 6. The radar time-frequency synchronization device according to claim 5, wherein, The input end of the first signal amplifier receives the first synchronous signal, and the output end of the first signal amplifier outputs the second synchronous signal; The input end of the second signal amplifier receives the first reference signal, and the output end of the second signal amplifier outputs the second reference signal; The input end of the third signal amplifier receives the third synchronous signal, and the output end of the third signal amplifier outputs the fourth synchronous signal; the first input end of the phase detector receives the first reference signal, the second input end of the phase detector receives the third reference signal, and the output end of the phase detector outputs the phase difference signal.
7. 7. The radar time-frequency synchronization device according to claim 6, wherein, The input end of the first laser receives the second synchronous signal, and the output end of the first laser outputs the first optical signal; the input end of the second laser receives the second reference signal, and the output end of the second laser outputs the second optical signal; A first input end of the first wavelength division multiplexer receives the first optical signal, a second input end of the first wavelength division multiplexer receives the second optical signal, and an output end of the first wavelength division multiplexer outputs the third optical signal; the input end of the second wavelength division multiplexer receives the fourth optical signal, the first output end of the second wavelength division multiplexer outputs the fifth optical signal, and the second output end of the second wavelength division multiplexer outputs the sixth optical signal; The input end of the first detector receives the fifth optical signal, and the output end of the first detector outputs the third reference signal; the input end of the second detector receives the sixth optical signal, and the output end of the second detector receives a third synchronous signal.
8. 8. The radar time-frequency synchronization device according to claim 7, wherein, The input end of the optical fiber receives the third optical signal, and the output end of the optical fiber outputs the third optical signal; The first input end of the adjustable light delay line receives the phase difference signal, the second input end of the adjustable light delay line receives the third optical signal, and the output end of the adjustable light delay line outputs the fourth optical signal.
9. 9. The radar time-frequency synchronization device according to claim 8, wherein, The length of the optical fiber is less than or equal to 10km.
10. 10. A method for time-frequency synchronization of a radar, comprising: Amplifying the first synchronous signal and the first reference signal by using an electric signal unit to obtain a second synchronous signal and a second reference signal, amplifying the third synchronous signal to obtain a fourth synchronous signal, and carrying out phase discrimination on the third reference signal and the first reference signal to obtain a phase difference signal; Converting and combining the second synchronous signal and the second reference signal by using an optical transceiver unit to obtain a third optical signal, and separating and converting the fourth optical signal to obtain a third reference signal and a third synchronous signal; And transmitting the third optical signal by using the optical transmission unit, and adjusting the third optical signal according to the phase difference signal to obtain a fourth optical signal.

Description

Radar time-frequency synchronization device and method Technical Field The present invention relates to the field of time-frequency signal synchronization. And more particularly, to a radar time-frequency synchronization apparatus and method. Background At present, compared with a single-base radar, the first technical difficulty of the distributed full-phase radar is the synchronization of time and phase among the unit radars. According to the report of the related literature, the realization of distributed transceiving coherent, the phase synchronization precision needs to reach ps magnitude, and the synchronization precision comprises two parts, wherein one part is the fixed delay of reference signal transmission between two stations, and the other part is the reference signal phase fluctuation in the transmission process. The fixed delay is related to the transmission distance, and can be calculated by a formula to correct; the invention mainly solves the phase fluctuation in the transmission process. Disclosure of Invention The invention aims to provide a radar time-frequency synchronization device and a method thereof, which are used for solving at least one of the problems existing in the prior art. In order to achieve the above purpose, the invention adopts the following technical scheme: the first aspect of the present invention provides a radar time-frequency synchronization device, comprising: The electric signal unit is used for amplifying the first synchronous signal and the first reference signal to obtain a second synchronous signal and a second reference signal, amplifying the third synchronous signal to obtain a fourth synchronous signal, and carrying out phase discrimination on the third reference signal and the first reference signal to obtain a phase difference signal; the optical transceiver unit is used for converting and combining the second synchronous signal and the second reference signal to obtain a third optical signal, and separating and converting the fourth optical signal to obtain a third reference signal and a third synchronous signal; And the optical transmission unit is used for transmitting the third optical signal and adjusting the third optical signal according to the phase difference signal to obtain a fourth optical signal. Optionally, the first input end of the electric signal unit receives the first synchronization signal; a second input end of the electric signal unit receives the first reference signal; a third input end of the electric signal unit receives the first reference signal; The fourth input end of the electric signal unit is connected with the first output end of the optical transceiver unit; The fifth input end of the electric signal unit is connected with the second output end of the optical transceiver unit; the first output end of the electric signal unit is connected with the first input end of the optical transceiver unit; the second output end of the electric signal unit is connected with the second input end of the optical transceiver unit; the third output end of the electric signal unit outputs the fourth synchronous signal; the fourth output end of the electric signal unit is connected with the first input end of the optical transmission unit; The third output end of the optical transceiver unit is connected with the second input end of the optical transmission unit; the third input end of the optical transceiver unit is connected with the output end of the optical transmission unit. Optionally, the electric signal unit comprises a first signal amplifier, a second signal amplifier, a third signal amplifier and a phase discriminator; The first signal amplifier is used for carrying out power amplification on the first synchronous signal to obtain the second synchronous signal; The second signal amplifier is used for carrying out power amplification on the first reference signal to obtain the second reference signal; the third signal amplifier is configured to power amplify the third synchronization signal to obtain the fourth synchronization signal; the phase discriminator is configured to perform phase discrimination on the third reference signal and the first reference signal to obtain the phase difference signal. Optionally, the optical transceiver unit includes a first laser, a second laser, a first wavelength division multiplexer, a first detector, a second detector, and a second wavelength division multiplexer; The first laser is used for converting the second synchronous signal into a first optical signal; the second laser is used for converting the second reference signal into a second optical signal; the first wavelength division multiplexer is configured to combine the first optical signal and the second optical signal into the third optical signal; the second wavelength division multiplexer is configured to divide the fourth optical signal into a fifth optical signal and a sixth optical signal; The first detector is used for converti