The Proust Radar decoding handware and coherent integration are specified. The specifications include characteristics, device description and enumeration of advantages and limitations

Petitdidier, M.

English

NASA Technical Reports Server

7.2A PROUST RADAR : DECODING HARDWARE AllD COHERENT INTEGRATION 
11. P e t i t d i d i e r  
C.R.P.E. 
4 Avenue de Neptune 
94107 Saint-Maur Cedex 
France 
1. Character is t ics  
-impulsion width :4 u s  
-PRF :I40 vs 
-code :quasi complementary 
-number of d i f f e ren t  codes :as many a s  number of coherent in teg ra t ions  (64) 
-number of subcodes : 20 -. 
-subcode width :200 ns  
-height r e so lu t ion  :30 m 
2. Device 
-decoding i n  r e a l  time before coherent in teg ra t ion  
-2U (number of subcodes) gates  decoded i n  p a r a l l e l  but output delayed 
(200 n s )  from one gate  t o  the next one 
-one card used f o r  decoding and coherent in teg ra t ions  (Figure 1 )  
- -number of cards:  20 iden t i ca l  cards + sequencer + memoty card 
-signdl A.D.C. d i s t r ibu ted  a t  the same time on 20 cards. Code c i rcula ted 
with a time delay of 200 ns from one card  t o  the next one 
3. Advantages - l imi ta t ions  
- r ea l i za t ion  of one card f o r  decoding and coherent in teg ra t ion  and duplica- 
t i o n  f o r  the others  
- t e l l a b i l i t y  of the device: one kind of spare cards 
- m s s i b i l i t y  t o  g e t  with the same device p r o f i l e  mode (600 m) o r  magnifier 
mode (30 m j  
-change of a l t i t u d e  reso lu t ion  by changing the width of the impulsion and 
subcodes 
- l imi ta t ion  due t o  the kind of A.D.C. avai lable  fo r  sampling frequency 
g r e a t e r t h a n l ~ z , t h e y a r e a d j u s t e d t o o n e f r e q u e n c y o n l y  . 
-number of sllbcodes f ixed 
https://ntrs.nasa.gov/search.jsp?R=19850024211 2020-03-20T18:06:33+00:00Z
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Proust radar: Decoding hardware and coherent integration, part 7.2A

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