1、m1a.J6m7 2 */ 1956d _?L“dG/T9 “d. 29Fabb )“d. 2Y,K9 “d I Sa ?LG / T,9 TV :?L“dG / T?L1,“d I Sa41bBa=a?Lr 9m d= _(/do_p) BSaXo6a la:c d,xo6a la: csPOT7 !bVB ! ?1S 7_ ? BG / T bGl?L l“d B I99mbTlB I “d.2b=1G / TbG / TdB/ KbG / T .1(C/ N).1(s/ N)1bGvV ? qB H,?L l q; TlV ?L l | ? : = 0. 91 20, P ? 1B :
2、, B , | Tb=29oK ,5. 2 D:X1B2T ,o(1B 2) T e=12b76K P ? 6B b, | b V1 saXo ?Lr qSo (2 . 265G Hz) Xo (8 . 2G H z) “r q9m (d B)r q9m (d B=d,1-ff11oCtJ 1r QJBmfn gn .b11UUnUt BBBBBBB5?L9mdv a i 7#j 1111 = 0b7709112 = 0b912 0s = 0b7 24 4n 4 = 0b83955 = 0b9 9081b= 0b97 05117 = 0 . 9 840, = 0 . 4 04547b50B1b
3、1 3B0b4 010b767 70b95060b74990b83950b88920b98170 . 98400b394658c68nfqOJO J n11nUf11nUQJBBBBB4M#V S Voc2)rnB=m B)B23B(T/=25 K ,5 D. 2:T Z=:cX (mBb2 , Tm=mcmOK2 . P , : = 0. 7244b P ? (1B b)p2 , B ,5. 2 D:Ji1=iX(1B 3 )ZT e=36 . 45K6B b,5. 2 D:Tm=(1B 3) Z T=3 . 14KXiB28 . m= 0 . 8395: g ( v H,“ l1B4=Sb
4、/ A = # /9 g ,9 ? 1Bpm, ? z ,PVs(1B,m)p2 , 3 ,B ,5. 2 D:liB2T :=(1B 4 )2psT G=15. 38K6B b,5. 2 D:T B=12x (1B m)4bQ#2 bT= 1. 33K# c ? 2:p4 :=, ,#9o ? s , |nbo0 . 98 , ? _ b, . 2 D:T 7= :pbm =Tg=13 . 59K3 .Qo9 ? 234 ,5 ? : 23m(1Bp=) ,? B_ , . 2 D:a q. 2_?L l“d q qF, . 2 V9b q( b). 2“d. 2Yvbb 3r . 2:T
5、E I = (FB1 ) Tb(2 )(2 ) T, F. 2“ ,lb .1b .11bTb,B |29 oKb q( a qs ), PYV ? 3 h,7 O x ,9 3B . 2,9v“d. 2bB x L (d B) q, r . 2:T : , = (iBG / G ) Tb(3 )(3 ) T, G L1G=10BL/m0 (4 ) q q r. 2:TE o = GT : x (5 )(5 ) T, G) 1V UbvG 1V U hba“d. 2sT S =XoB: m )6B_ b,2 s mTb= 1b61K5. 2 D: 9 “d. 2,|?L l“dV Um3 UL
6、= 1 “dbT p =X ( ,Bp, ) 2p3ppm=bcoK6bSo ?L 2T =T , ET Z + T 3 ET 4 ET , ETb ET 7+ T s ET g=85 . 50KvV1?Lr q“ V9 Xo ?L. 2T = 79. gKuH.j gmB m3 ,?L“d mm3?L“d m, TA ?L.2, GzaT ,sY= ( q)9mr . 2, q,r . 2 T(2 ) B24B;q,r . 2 T(3 ) bm3, 9. 2 q:pb=: KB (T + T : ) G G ZBG N+ T 2G ZBG N El ET NG Nr(6 )T(6 ): K
7、j:% (l . 38a10op9/ K)B?L l“d. 2zb| T(6 ) T“d9mGG ZlGa,5:P ,=KB (T A + T l ET Z/ G , ET : / G , G Z+l+ TN / G : G :BG NB, ) (7 ) T(7 ), | “ I1V U“d. 2,:T:T ; , = T ATb ET : / G , ET : / G , G Z+l+ T N/ G , G :lG NB, (8 ) T(8 ), 7T A=o ,5:T : :=T ; ET : / G ,aBT 3 / GG Z+ T N/ G IG :lG N _ , (9 )T(9 )
8、T E :?L“d I1V Ur . 2b 9 ZL, B IK ,l. 2,. 2,r . 2“d. 2, m4 Ubm4K I,|KP s AT, K s ATopbKIlT ; KV U:TK = (Tb+ T , )G IG ZlG K _ ; + T Z G :lG KB, ETKB, G KB, (10)K Ilopr . 2T : K:T : K=T KaT K E: /G K El ET N /G KG K , ,lG NB, (21)K Il“d. 2T s K:T s : = T; KmT : K (22)N H,?L“d. 2 mem5 T:m5?L“d. 2e mBa?
9、L“dG / T9 _?L“d,?L. 2 ?L 9 ,yN,?LK=T l.=(T + T l )G , G ZG 3GmG sET Z G : G 3GmGb+ T 3G :GBG s+ TmGBG S + T oGb(14)opr . 2:Tb:=: T :b=Tb+ T , / G 6 + T : / G 6G ?+ Tb/ GbG ?G : + T ,b/ GbG 7GbGb+ T , , / GbG 7G : GbG ,b+ T 1 2 / / G oG : G sGbG I oG : z+ T l : / GbG 7GbGbG lbG , , G :b(15)“d. 2 T(14
10、)a(15)b i IK ,V2 SoG/ T9 T,V3 xo G / T9 TbV2V3/ 1 :1 .!: V IK ,“d99mG T K d. 2Tba b.?L“dG / T(G=G T K ,T=T s : ), IK , MbSo : G / T=21 . o3 dB/ kxo : G / T=31 . 47 dB/ k hL5b H9 b3 .?L9m,5G / TB9vb4 .“d. 21 s?L. 2T *a Lr . 2T ,lTbb &. 2TbYbT ayr ,BT STb,11G / Tb TaloK ,5So G / TL9Fo . 25dB , Xo G /
11、T9F0. 21d B ,b. 2Tb10K ,5So G / T9F0 . 27d B , Xo G /T9Fo . 23dBb5 .SaXo b 40 dB9m,b ).“d. 2#G /TV2 so ?L“dG / Taa ZBdBBK 03bZ. aa:baBJ maKaT1BBl qG K (dB )T K (K ) .G T K (d B )T T K (K ) T Ea(K ) JT S K (K ) GT KT s K21212 1J+QUIL.1lfJ49:.mqm 1 “99 gOYY 1 o b qs /M qs bv l HB0b05B0b05B0b2 0BOb05B0
12、b0 34OB3 . 262 0b9B1 4 . 1B3b26003b3 63b3 61 3b6 63b3 62 . 006032 4b34420 b577 64b16324b342610549629085b5087b8490b99b101b102 .162b76b94 9636 9b151430595 9a7 7ab45a4 8a43 a6 9a24a93b9 089b5 085b1 56 8 . 276 4b1 761b741b7 48b0 417 9b4017/b341 75b301 67b411 65b471 64b3322b19gh 1.4 J, 3QLJOOt qJ.ll, gOb
13、BJ29O Cat nhh01 0477ll|a.+7l4 7 .1 8b83 9657862902 7a !95Y333 a57a72a2 9a27al27a2 7a2 1b0 32 1b0 32 1b0 321b032 1b032 1b032 1b0321b0321b032 1b03l110laBmJmmno1.,l1lb17 5J+m = lm, .11,.esesr.m9 92OJ gnaCq zLOf 9,1 10 gno71m m4llgJOCnmd q0000n .o .dYYJ , 00tUOC11qG , , T A a=10 4 b= 0 3B26BV3 xo ?L“dG
14、/ Tq 1 *o b qs- /M qs B bv l H(dB) TK (K )BG=(dB)r=(K) T : K (K )TbKaK ) G SKbdc)l()B0B0B0. 05. 05_ 20B0 . 05B0 . 0340B3b20 .B16263b3 .13b3b2 .90324 .4201b6 112965=79 . 7982b2084. 5893 . 8296. 0797. 40137 .oa88 . 48a97. 48b3 . 230032 .26105 962905. 6454b5954. 5454. 3454. 2954. 2694. 261 . 00111b4094
15、 . 8091b5491b5491 . 542 .10010010133b127 . 51122 . 73118b0099b6595b1992 . 552b55a1b1ga8 b03a1b81a207b30204. 93202 . 586bo1819695olb8 650al 290193 .191 .139 .189b89b98b215b101b1CIb101b95a67a3Zb1la53al53an53aB32b1723b1223 . 0722 . 8722b8222 . 7962b7959 . 5379b9363 . 3360b0760 . 9731b4731 . 4 31b4731b4
16、731b4731b4731b4731b4 31b4731b4731b4731. 731bV7 nftJJ OdznB. ff0nobnU BdJq, gQLJhvdnno05O* G * * T a=1 0 4 b = 10 6Y vbSo ,“d. 2Y(9F) 1 . 7K , G / Tb. 04 6d BbXo ,“d. 2Y(9F) 2 . 5 5 K , G /To. 59dBba sP OTxo V q3n:G / T = 3 1 . 47dB / K l50 MB Psm q10Bb H,5 . oZdB.1b f V :_ ? l ? MSSm aT Mm sPO Tm v
17、b 9 G / T 5b H7, L= ,hLT H,v5o,?L. 2 “?L97, , G / T9 “?L979bSo V p: G / T=2 1 . O3dB / Kb lMSSm q10- H,5 . sdB.1 bL A ND S A T Xo Vq3n: G /T=: 31 . 47dB /K , lMS Sm q10Bo H,7 . 9 7dB.1 b lTMm q10oo H,3 . 7 7dB.1 b IDq1r ,mc d _?L16p,uS bW S/ v1984 M4 q2rG . W . CoBLINS , a No iseT e m Pe r a t u re C a le u la tio n s fo rm Fe e d S y st-e m Ch a ra e t e ri , Lis , MIC R OW A V E JO U RBN A L , D e e e m be r 196 9 P67 3rSCIE N C+FICBA T L A NT A INCoT e e h n io a 1 Po Po sa l fo i Sp o t a n d L a n d s -a tBD R e e e iv in g S yste m , 3 Ma re h 1982B27B
