Transceiver networking radar autonomous time synchronizing system based on pseudo random coding signal and method thereof

Abstract

The invention provides a transceiver networking radar autonomous time synchronizing system based on a pseudo random coding signal and a method thereof. The method comprises the steps of generating a sampling clock signal and a pulse repetition frequency signal which are required for radar transmission, thereby generating a radar synchronization signal, performing power amplification and radiating,wherein the radar synchronization signal comprises a monopulse signal, a short-code-element m-sequence modulating signal and a long-code-element m-sequence modulating signal; performing preprocessingand sampling on the received radar synchronizing signal, performing pulse compression processing on the direct wave signals of the short-code-element m-sequence modulating signal and the long-code-element m-sequence modulating signal, and calculating a highest value of a respective pulse response function; and calculating the time interval of the highest value of two or more adjacent long-code-element pulse response functions, and using the reciprocal of the time interval as the pulse repetition rate of the radar transmitting signal. The transceiver networking radar autonomous time synchronizing system and the method thereof can realize nanosecond-grade synchronizing precision and furthermore have advantages of low cost, low power consumption, high signal-to-noise ratio, high interferenceresistance, simple system structure, etc.

Description

technical field [0001] The invention belongs to the technical field of radar, and relates to an autonomous time synchronization system and method for a transceiver networking radar based on a pseudo-random coded signal. Background technique [0002] In recent years, the transceiver network radar technology has attracted much attention in the scientific and engineering circles, especially in the fields of space-based transceiver network imaging radar earth observation, distributed radar multi-view imaging and other fields with great application value. The transceiver networked imaging radar has the advantages of high-resolution wide-band imaging detection without blind spots, and can obtain the scattering characteristics of ground targets in multiple directions, providing rich information for later target characteristic inversion; at the same time, the transceiver networked radar can also be used for For the detection of stealth targets, the detection performance of stealth t...

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Problems solved by technology

[0004] At present, there are mainly four time synchronization schemes for transceiver networking radars: first, when the conditions are met, using optical fiber or coaxial cable for time synchronization is difficult to meet the requirements of relatively moving transceiver networking radars; second, using Synchronization with a high-stable atomic clock can achieve better synchronization, but it is expensive; third, using GPS to tame the high-stable crystal oscillator method for time synchronization can achieve better time synchronization, but the taming time is longer and is easily affected by Doppler Fourth, when transmitting a single time-domain narrow pulse signal or single-frequency signal for time synchronization, due to interference from the external electromagnetic environment, the signal-to-noise ratio of the received direct wave is very low, resulting in a greatly reduced synchronization accuracy

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