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Switched to new cleaner argument system
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AlexandreRouma
133
decoder_modules/kg_sstv_decoder/protocol_translated.txt
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133
decoder_modules/kg_sstv_decoder/protocol_translated.txt
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○ Transmission by MSK and 4L-FSK
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MSK is a type of FSK method that is a modulation method for digital signals, and is the mark frequency of FSK.
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Minimize the frequency between the number and the space frequency (Minimum Shift Keying)
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4L-FSK is a 4-value FSK, and 4 modulation frequencies that can be taken with a type of FSK are provided.
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This makes it possible to obtain twice the transmission speed compared to MSK.
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4L-FSK is more susceptible to noise because the frequency interval is narrower than MSK.
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It also becomes more susceptible to deterioration of transmission line characteristics.
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There are two types of choices, but when the line condition such as FM is good, the image will be sent quickly, so
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Or I think you should select 4L-FSK to send high quality images. wireless
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If the SSB transmission in HF where the line condition is unstable is set to MSK, the data will be as it is.
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I think it will be.
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The first pull-down menu from the top of the pull-down menu on the right side of Send Image
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You can select MSK or 4L-FSK in the new.
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○ Transmission in convolutional code mode
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The second pull-down menu from the top of the pull-down menu on the right side of Send Image
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New is the choice of code processing. Here no code processing (NORM) or convolutional code processing
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Set whether to perform (CONV).
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When convolutional code processing is performed, it becomes stronger against noise, but the same data is sent.
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It takes about twice as long to complete.
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Please select the code processing on a case-by-case basis while checking the transmission status.
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This setting can be changed even during transmission.
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○ Sending and receiving text messages
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With KG-STV, a maximum of 510 half-width characters (255 full-width characters) text message can be sent once.
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You can send sage.
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To send a text message, text in the input box under Resp BSR
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And click Send Text on the right.
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When you receive a text message, the text will be displayed in the box below.
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○ KG-STV transmission standard
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Modulation format: MSK or composite modulation of MSK and 4-value FSK
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Modulation speed: 1200baud
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Modulation frequency: MSK …… Space frequency 1200Hz Mark frequency 1800Hz
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4L-FSK ...
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'00' 1200Hz
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'01' 1400Hz
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'10' 1600Hz
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'11' 1800Hz
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Bandwidth: 500-2500Hz
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Error correction: None or Viterbi code (NASA standard K = 7, R=1/2, P=[109, 79] code)
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Whitening: Yes (add M-sequence code with a period of 127 bits to each bit)
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Interleaver: None
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Header: 01 repeat signal is 256 bits
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Basic code configuration: Synchronous code + 54-bit length information chunk + arbitrary length data chunk
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Error detection: Yes (CRC 16 CCITT)
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Synchronous bit: 63-bit M-sequence code
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Image compression: JPEG compatible (16x16 pixels, thinning 4: 1: 1)
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Character code: Shift JIS compatible
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Radio format: F1D (operation in SSB mode)
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F2D (operation in FM mode)
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Information chunk configuration (system code version '0')
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┌─────┬─────┬───┬───┬───┬───┬────┬──────┬─────┐
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│ sys │ com │ c │ m │ x │ y │ sc │ size │ CRC │
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└─────┴─────┴───┴───┴───┴───┴────┴──────┴─────┘
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0 4 8 9 10 16 22 26 38 54bit
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Sys: system code
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Com: command code
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C: sign mode
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M: Modulation mode
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X: Image block position (X)
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Y: Image block position (Y)
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Sc: JPEG scale size
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Size: data size
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CRC: Error detection code
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* Information chunks always perform MSK modulation + convolution processing.
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Data chunk structure (system code version '0')
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┌──────┬─────┐
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│ data │ CRC │
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└──────┴─────┘
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* Data chunks are transmitted following the CRC code of the information chunks.
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Command table (system code version '0')
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┌─────┬────────┐
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│ Command value │ Operation │ │
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├─────┼────────┤
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│ 0 │ text transmission │
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├─────┼────────┤
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│ 1 │ Image transmission │ │
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├─────┼────────┤
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│ 2 │ BSR response │ │
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├─────┼────────┤
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│ │ 3 │ end │ │
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├─────┼────────┤
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│ │ 4 │ BSR request │ │
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├─────┼────────┤
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│ 5 │ Canceled (suspended) │
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├─────┼────────┤
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│ 6 │ call sign │
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└─────┴────────┘
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* When starting transmission, the header code of 01 shall be transmitted first.
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* One data format (code configuration) is
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Synchronous code + information chunk + data chunk
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It will be. However, the end signal, stop signal, and BSR signal do not include data chunks.
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stomach.
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* In the case of image data, this data format is continuous for the number of image blocks.
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It shall be sent.
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* In the case of text transmission, it shall be completed in one data format.
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* When the transmission is completed normally, the end signal shall be transmitted three times at the end.
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* When the transmission is canceled, the cancellation signal shall be transmitted three times at the end.
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Synchronous code
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000011100001001000110110010110101110111100110001010100111111010
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Whitening code
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1110110011000100100111001111100100000100011010101001101101001010000101100001100101111111010110111011110001110100010101110000001
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○ KG-STV needs more experiments
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KG-STV was born from the creator's own interest in digital image communication.
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However, there is a lack of practical experience due to the ability of the person himself / herself.
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Therefore, the actual luck is that the transmission time is slow, the image quality is poor, and it is difficult to receive.
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I think there are many situations where it is not practical in terms of use.
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In such a case, I would like to research as a new issue, so by all means
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We hope that many people will use it and give us their impressions.
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Inconvenience such as bugs and operational problems until the degree of completion is high after receiving your opinions
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We apologize for the inconvenience, but thank you for your cooperation.
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Creator: K.G (JJ0OBZ Myoko City, Niigata Prefecture)
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-------------------------------------------------- -------------------------------------------------- --------------------
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Created and written by K.G k.g8956@ymail.plala.or.jp
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Today also from the day of the plane http://www2.plala.or.jp/hikokibiyori/
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-------------------------------------------------- -------------------------------------------------- --------------------
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