A Time and Frequency Synchronization Method for Mobile Bistatic Radar

Abstract

The invention relates to a method for synchronizing the time and the frequency of a motor-driven configured bistatic radar. The frequency and the time between a receiving station and a transmitting station of the bistatic radar can be realized by utilizing the characteristics of long-term stability, low phase noise and low stray; when the receiving station and the transmitting station are deployed separately, the real-time statistics of time synchronization errors of the receiving station and the transmitting station are completed on the basis of pulses per second of a navigation satellite; when the time synchronization errors exceed a limit value and the state of the pulses per second of the navigation satellite is normal, time resynchronization between the receiving station and the transmitting station is completed in a navigation satellite time service synchronization mode; the receiving station and the transmitting station enter a timekeeping synchronization state again. The method is applicable to synchronizing the time and the frequency of the motor-driven configured bistatic radar, and has the advantages of short erecting and withdrawing time, high maneuverability, high working stability and the like. Before the receiving station and the transmitting station are deployed separately, the modes of direct time contrast synchronization and long-time autonomous timekeeping maintenance are adopted, and have the advantages of being not limited by the navigation satellite and not impacted by electromagnetic environment in wartime.

Description

technical field [0001] The invention belongs to the technical field of bistatic radar, and in particular relates to a method for synchronizing time and frequency of mobile bistatic radar. Background technique [0002] The receiving and transmitting stations of the bistatic radar are located separately, and the baseline distance ranges from several thousand meters to tens of kilometers. In order to measure the target distance and coordinate the work of the receiving and transmitting stations during work, the receiving and transmitting stations must maintain time synchronization. In order to be able to receive To amplify the echo signal, the receiving and transmitting stations must work at the same frequency. Time and frequency synchronization is the core of the "three sameness" key technology of bistatic radar. [0003] The method of using fiber-optic and wired links to transmit time and frequency synchronization signals has the characteristics of good stability and high prec...

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Problems solved by technology

[0003] The method of using optical fiber and cable link to transmit time and frequency synchronization signal has the characteristics of good stability and high precision, but the field optical cable takes a long time to erect and withdraw, and the demand for personnel is large, which cannot meet the requirements of radar mobile deployment configuration.

Using microwave signals to directly transmit frequency and time reference signals wirelessly, although it has good mobility, the stability and accuracy of synchronization are easily affected by environmental factors such as terrain

The method of using GPS navigation satellites to synchronize the time and frequency of bistatic radars is relatively mature, but because the application of GPS in wartime may be limited, this method is not advisable to be used in military radar

Peng Fang and others proposed a bistatic radar time and frequency synchronization method based on Beidou satellites, see "Journal of Missiles and Guidance", Volume 27, Issue 1, Pages 18-20 in 2007, this method uses my country's own satellites The time service of the navigation system avoids the possible limitations of the GPS synchronization method used in wartime, but this method requires the continuous use of navigation satellite signals. When the Beidou satellite is interfered in wartime, the radar time-frequency synchronization has problems and cannot be used.

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