s06.htm

关于扩频的一些好资料

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            style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">跳频频率的数目</SPAN></P>
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            style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">跳频的速率</SPAN></P>
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            style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">跳频码的长度</SPAN><SPAN 
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            style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">周期</SPAN><SPAN 
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            style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">跳频系统的同步时间</SPAN><SPAN 
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            style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">一般说来，希望跳频带宽要宽，跳频的频率数目要多，跳频的速率要快，跳频码的周期要长，跳频系统的同步时间要短。</SPAN><SPAN 
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            跳频带宽的大小，与抗部分频带的干扰能力有关。</SPAN><SPAN lang=EN-US 
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            style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">跳频带宽越宽，抗宽带干扰的能力越强。所以希望能全频段跳频。例如，在短波段，从</SPAN><SPAN 
            lang=EN-US style="FONT-SIZE: 12pt">1.5MHz</SPAN><SPAN 
            style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">到</SPAN><SPAN 
            lang=EN-US style="FONT-SIZE: 12pt">3MHz</SPAN><SPAN 
            style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">全频段跳频；在甚高频段，从</SPAN><SPAN 
            lang=EN-US style="FONT-SIZE: 12pt">30MHz</SPAN><SPAN 
            style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">到</SPAN><SPAN 
            lang=EN-US style="FONT-SIZE: 12pt">80MHz</SPAN><SPAN 
            style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">全频段跳频。</SPAN><SPAN 
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            style="FONT-SIZE: 12pt; COLOR: teal; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">跳频频率的数目，与抗单频干扰及多频干扰的能力有关。</SPAN><SPAN 
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            style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">跳变的频率数目越多，抗单频、多频以及梳状干扰的能力越强。在一般的跳频电台中，跳频的频率数目不超过</SPAN><SPAN 
            lang=EN-US style="FONT-SIZE: 12pt">100</SPAN><SPAN 
            style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">个。</SPAN><SPAN 
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            style="FONT-SIZE: 12pt; COLOR: teal; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">跳频的速率，是指每秒钟频率跳变的次数，它与抗跟踪式干扰的能力有关。</SPAN><SPAN 
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            style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">跳速越快，抗跟踪式干扰的能力就越强。一般在短波跳频电台中，其跳速目前不超过</SPAN><SPAN 
            lang=EN-US style="FONT-SIZE: 12pt">100</SPAN><SPAN 
            style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">跳／秒。在甚高频电台中，一般跳速在</SPAN><SPAN 
            lang=EN-US style="FONT-SIZE: 12pt">500</SPAN><SPAN 
            style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">跳／秒。对某些更高频段的跳频系统可工作在每秒几万跳的水平。</SPAN><SPAN 
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            style="FONT-SIZE: 12pt; COLOR: teal; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">跳频码的长度，它将决定跳额图案延续时间的长度，这个指标与抗截获</SPAN><SPAN 
            lang=EN-US style="FONT-SIZE: 12pt; COLOR: teal">(</SPAN><SPAN 
            style="FONT-SIZE: 12pt; COLOR: teal; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">破译</SPAN><SPAN 
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            style="FONT-SIZE: 12pt; COLOR: teal; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">的能力有关。</SPAN><SPAN 
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            style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">跳频图案延续时间越长，敌方破译越困难，抗截获的能力也越强。跳频码的周期可长达</SPAN><SPAN 
            lang=EN-US style="FONT-SIZE: 12pt">10</SPAN><SPAN 
            style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">年甚至更长的时间。</SPAN><SPAN 
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            style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">跳频系统的同步时间，是指系统使收发双方的跳频图案完全同步并建立通信所需要的时间。系统同步时间的长短将影响该系统的顽存程度。因为同步过程</SPAN><SPAN 
            lang=EN-US style="FONT-SIZE: 12pt; mso-spacerun: yes">&nbsp; 
            </SPAN><SPAN 
            style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">一旦被敌方破环，不能实现收、发跳频图案的完全同步，则将使通信系统瘫痪。因此，希望同步建立的过程越短越好，越隐蔽越好。根据使用的环境不同，目前跳频电台的同步时间可在秒或几百毫秒的量级。</SPAN><SPAN 
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            style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">当然，一个跳频系统的各项技术指标应依照使用的目的、要求以及性能价格比等方面综合考虑才能作出最佳的选择。</SPAN><SPAN 
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            lang=EN-US style="FONT-SIZE: 12pt; COLOR: navy">6.1.5<SPAN 
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            style="FONT-SIZE: 12pt; COLOR: navy; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">跳频系统的主要特点</SPAN><SPAN 
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