XW-4
（
CAS-10
）
Amateur Radio Satellite User's Manual
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31
V2.0 by BA1DU
龚万骢
starts to be stored.
2
）
Camera number:
fixed value 1
3
）
Photograph counter:
start counting from 1, and restart counting from 1 when
it is full. 0 is the initial state, which means that no photo has been taken yet. 1~999
is the photo count value.
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2
）
Photo data
The downlink transmission of photo data uses the telemetry RF channel, using the
same modulation system and RF specification as the telemetry transmission.
When the satellite receives and executes the download photo remote control
command from the ground station, the transmission of telemetry data stops
immediately, and instead sends the photo data required to be downloaded in the
remote control command. Each frame of photo data is 256 bytes, all of which are
valid data for the photo. Each time the photo data is sent, all data frames of that
photo are sent continuously. There are two types of photos, one with a resolution of
256X256 pixels and a photo data size of 64K bytes, the other with a resolution of
512X512 pixels and a photo data size of 256K bytes.
After downloading the photo data, connect all the data frames (256 bytes per frame)
together according to the download sequence, store it as a file with raw as the
extension, and then use the picture browsing software to open the file to view the
photo.
