航天电子对抗
航天電子對抗
항천전자대항
AEROSPACE ELECTRONIC WARFARE
2012年
1期
48-51
,共4页
宽带模糊函数%直扩%跳频%航天测控%抗干扰
寬帶模糊函數%直擴%跳頻%航天測控%抗榦擾
관대모호함수%직확%도빈%항천측공%항간우
wideband ambiguity function%DS/FH%spaceflight telemetry and command%anti-jamming
引入直扩/跳频（DS/FH）混合扩频技术可以增强航天测控系统的电子对抗能力。推导了DS/FH混合扩频信号的宽带模糊函数表达式。通过分析得知,随着载波频率的增加,信号时长的变化对模糊值的影响减弱,宽带和窄带模糊函数间的差异减小,但在接收信号的处理中仍需考虑对信号时长变化的匹配。数值仿真分析了DS/FH信号波形在不同增益分配下的分辨率、精度、旁瓣抑制及抗干扰等性能。结果表明在一定的增益分配下,该波形具有接近理想的图钉型模糊图,适当增加跳频增益可以获得更好的分辨率和抗干扰性能。
引入直擴/跳頻（DS/FH）混閤擴頻技術可以增彊航天測控繫統的電子對抗能力。推導瞭DS/FH混閤擴頻信號的寬帶模糊函數錶達式。通過分析得知,隨著載波頻率的增加,信號時長的變化對模糊值的影響減弱,寬帶和窄帶模糊函數間的差異減小,但在接收信號的處理中仍需攷慮對信號時長變化的匹配。數值倣真分析瞭DS/FH信號波形在不同增益分配下的分辨率、精度、徬瓣抑製及抗榦擾等性能。結果錶明在一定的增益分配下,該波形具有接近理想的圖釘型模糊圖,適噹增加跳頻增益可以穫得更好的分辨率和抗榦擾性能。
인입직확/도빈（DS/FH）혼합확빈기술가이증강항천측공계통적전자대항능력。추도료DS/FH혼합확빈신호적관대모호함수표체식。통과분석득지,수착재파빈솔적증가,신호시장적변화대모호치적영향감약,관대화착대모호함수간적차이감소,단재접수신호적처리중잉수고필대신호시장변화적필배。수치방진분석료DS/FH신호파형재불동증익분배하적분변솔、정도、방판억제급항간우등성능。결과표명재일정적증익분배하,해파형구유접근이상적도정형모호도,괄당증가도빈증익가이획득경호적분변솔화항간우성능。
The introduction of the hybrid DS/FH spread spectrum technology could enhance TTC systems electronic countermeasure capability.The expression of the wideband ambiguity function(WAF) is derived.It is known that,with carrier frequency increase,the difference between wideband and narrowband ambiguity function decrease for weakened signal duration impact on ambiguity function.However,signal duration change should be matched in the receiving signal processing.On the basis of the WAF expression,the performance of waveforms with various spreading gain assignment such as resolution,accuracy,sidelobe suppression and anti-jamming are simulated numerically and analyzed.Simulation results show that DS/FH signals possess almost ideal thumbtack AF plot with certain spreading gain assignment,and better resolution and anti-jamming performances would be obtained with relatively large FH spreading gain.
