| Conventional single-pulse radar can not take into account the distance resolutionas well as the operating range. Pulse compression technology can effectively resolvethis conflict, so it have been widely used.However, the sidelobes of pulse compressionecho signals and the Doppler frequency shift will have an impact on the measurementaccuracy.Therefore, the degree of influence from sidelobe and Doppler shift todifferent pulse compression signal as well as the compensation method to the influenceare important to be researched.Pulse compression and Doppler sensitivity of the linear frequency modulationsignal(LFM) and the phase-encoded signal which are commonly used from pulsecompression signals are studied in this paper. With the Combination of measured dataand simulation,the side lobe suppression effect to the LFM signal by weighted windowfunction is analyzed.The upping and downing frequency modulation compensatoryalgorithm for the LFM is used for regulating the ranging error due to distance-speedcoupled in the presence of Doppler frequency shift.M-sequence code as the object ofstudy,Least Square algorithm and Iterative Weighted Least Square algorithm are usedfor suppressing sidelobe, the effect is more obvious. For the Doppler sensitivity of theM-sequence code, the influence of Doppler shift to signals and Doppler sensitivity ofsignal under different values of code length and sub-pulse width is researched.Dopplercompensation method based on alternating M-sequence signal is used for Eliminatingthe influence of the Doppler frequency shift.This method is effective on eliminateDoppler frequency in echo signal, reach compensation purposes. |
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