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Ionospheric sounding    
United States Patent5230076   
Link to this pagehttp://www.wikipatents.com/5230076.html
Inventor(s)Wilkinson; Robert G. (Portsmouth, GB2)
AbstractAn ionospheric sounding system for frequency management of a HF communications system operates between a transmitter and a remote receiver and makes use of code-modulated narrow band sounding pulses transmitted at frequencies throughout the HF band. The code has an impulsive auto-correlation function and the frequency selection is pseudo-random. The code may be a two-part complementary code. Alternatively the code may be a selected one of a family of codes possessing high auto-correlation and low cross-correlation properties, thereby enabling communications management information to be conveyed by the choice of code. Measurements of signal and noise are made at the receiver for each transmitted frequency to assist establishing a HF communications link. Synchronous detection of the received signal is used, employing correlators (103, 104) in phase quadrature.
   














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Drawing from US Patent 5230076
Ionospheric sounding - US Patent 5230076 Drawing
Ionospheric sounding
Inventor     Wilkinson; Robert G. (Portsmouth, GB2)
Owner/Assignee     The Secretary of State for Defence in Her Britannic Majesty's Government (London, GB2)
Patent assignment
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Publication Date     July 20, 1993
Application Number     06/807,972
PAIR File History     Application Data   Transaction History
Image File Wrapper   Patent Term   Fees
Litigation
Filing Date     October 29, 1985
US Classification     455/62 375/133 375/150 455/63.1 455/67.13 455/226.1 455/226.2 455/226.3
Int'l Classification     H04B 017/00
Examiner     Gregory; Bernarr E.
Assistant Examiner    
Attorney/Law Firm     Nixon & Vanderhye
Address
Parent Case    
Priority Data     Oct 30, 1984[GB]8427440
USPTO Field of Search     455/63 455/65 455/69 455/160.1 455/161.1 455/2 455/3 455/4 455/5 455/6 455/7 455/8 455/9 455/10 455/11 455/12 455/13 455/14 455/15 455/16 455/17 455/18 455/19 455/20 455/21 455/22 455/23 455/24 455/25 455/26 455/27 455/28 455/29 455/30 455/31 455/32 455/33 455/34 455/35 455/36 455/37 455/38 455/39 455/40 455/41 455/42 455/43 455/44 455/45 455/46 455/47 455/48 455/49 455/50 455/51 455/52 455/53 455/54 455/55 455/56 455/57 455/58 455/59 455/60 455/61 455/62 455/63 455/64 455/65 455/66 455/67 455/68 455/69 455/70 455/71 455/72 455/73 455/74 455/75 455/76 455/77 455/78 455/79 455/80 455/81 455/82 455/83 455/84 455/85 455/86 455/87 455/88 455/89 455/90 455/91 455/92 455/93 455/94 455/95 455/96 455/97 455/98 455/99 455/100 455/101 455/102 455/103 455/104 455/105 455/106 455/107 455/108 455/109 455/110 455/111 455/112 455/113 455/114 455/115 455/116 455/117 455/118 455/119 455/120 455/121 455/122 455/123 455/124 455/125 455/126 455/127 455/128 455/129 455/130 455/131 455/132 455/133 455/134 455/135 455/136 455/137 455/138 455/139 455/140 455/141 455/142 455/143 455/144 455/145 455/146 455/147 455/148 455/149 455/150 455/151 455/152 455/153 455/154 455/155 455/156 455/157 455/158 455/159 455/160 455/161.3 455/67.1 455/226.1 455/2 455/3 455/4 455/5 455/6 455/7 455/8 455/9 455/10 455/11 455/12 455/13 455/14 455/15 455/16 455/17 455/18 455/19 455/20 455/21 455/22 455/23 455/24 455/25 455/26 455/27 455/28 455/29 455/30 455/31 455/32 455/33 455/34 455/35 455/36 455/37 455/38 455/39 455/40 455/41 455/42 455/43 455/44 455/45 455/46 455/47 455/48 455/49 455/50 455/51 455/52 455/53 455/54 455/55 455/56 455/57 455/58 455/59 455/60 455/61 455/62 455/63 455/64 455/65 455/66 455/67 455/68 455/69 455/70 455/71 455/72 455/73 455/74 455/75 455/76 455/77 455/78 455/79 455/80 455/81 455/82 455/83 455/84 455/85 455/86 455/87 455/88 455/89 455/90 455/91 455/92 455/93 455/94 455/95 455/96 455/97 455/98 455/99 455/100 455/101 455/102 455/103 455/104 455/105 455/106 455/107 455/108 455/109 455/110 455/111 455/112 455/113 455/114 455/115 455/116 455/117 455/118 455/119 455/120 455/121 455/122 455/123 455/124 455/125 455/126 455/127 455/128 455/129 455/130 455/131 455/132 455/133 455/134 455/135 455/136 455/137 455/138 455/139 455/140 455/141 455/142 455/143 455/144 455/145 455/146 455/147 455/148 455/149 455/150 455/151 455/152 455/153 455/154 455/155 455/156 455/157 455/158 455/159 455/160 455/161.3 375/110
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