SR-0 decode from ChatGPT
● (No.1160) SR-0 decode from ChatGPT (2024年8月25日)
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Reference URL:
https://community.libre.space/t/isro-sslv-d3-2024-08-16-03-47-utc/11876/50
Little-endian order:
https://www.asahi-net.or.jp/~ei7m-wkt/numb1146.htm
https://www.ne.jp/asahi/hamradio/je9pel/stratsat.htm
1. Free login this site, https://chatgpt.com/ as Google account.
2. On the "Message ChatGPT" line at the bottom, simply paste in the ENTIRE instruction below:
struct satellite_info {
char call_sign[6];
uint16_t frame_number;
uint8_t message_type;
uint8_t transmission_power;
unsigned long satellite_unix_time;
int16_t obc_temperature;
int16_t battery_temperature;
int16_t external_temperature;
int16_t base_plate_temperature;
int16_t solar_panel_temperature;
int16_t radiation;
uint16_t bus_voltage;
int16_t bus_current;
uint16_t battery_maximum_capacity;
uint16_t battery_remaining_capacity;
uint16_t solar_bus_voltage;
uint16_t solar_bus_current;
uint16_t boot_counter;
uint8_t checksum;
};
3. … after that, paste in HEX decodes on the "Message ChatGPT" line at the bottom:
53 52 30 53 41 54 FC 19 01 00 24 B4 C1 66 A4 00 E5 00 F6 FF 71 00 45 00 B8 01 23 10 DC FF 7A 0A 03 0C 2C 10 24 00 01 00 17
4. Watch the parsing of the data flow up the screen:
53 52 30 53 41 54 -> "SR0SAT"
Frame Number (uint16_t frame_number):
FC 19 -> 0x19FC (hex) -> 6652 (decimal)
Message Type (uint8_t message_type):
01 -> 1
Transmission Power (uint8_t transmission_power):
00 -> 0 (100 mW)
Satellite Unix Time (unsigned long satellite_unix_time):
24 B4 C1 66 -> 0x66C1B424 (hex) -> 1724081700 (decimal)
OBC Temperature (int16_t obc_temperature):
A4 00 -> 0x00A4 (hex) -> 164 (divided by 10) -> 16.4°C
Battery Temperature (int16_t battery_temperature):
E5 00 -> 0x00E5 (hex) -> 229 (divided by 10) -> 22.9°C
External Temperature (int16_t external_temperature):
F6 FF -> 0xFFF6 (hex) -> -10 (divided by 10) -> -1.0°C
Base Plate Temperature (int16_t base_plate_temperature):
71 00 -> 0x0071 (hex) -> 113 (divided by 10) -> 11.3°C
Solar Panel Temperature (int16_t solar_panel_temperature):
45 00 -> 0x0045 (hex) -> 69 (divided by 10) -> 6.9°C
Radiation (int16_t radiation):
B8 01 -> 0x01B8 (hex) -> 440 (divided by 100) -> 4.4 µSv/h
Bus Voltage (uint16_t bus_voltage):
23 10 -> 0x1023 (hex) -> 4131 mV
Bus Current (int16_t bus_current):
DC FF -> 0xFFDC (hex) -> -36 (divided by 1000) -> -0.036 mA
Battery Maximum Capacity (uint16_t battery_maximum_capacity):
7A 0A -> 0x0A7A (hex) -> 2682 mAh
Battery Remaining Capacity (uint16_t battery_remaining_capacity):
03 0C -> 0x0C03 (hex) -> 3075 mAh
Solar Bus Voltage (uint16_t solar_bus_voltage):
2C 10 -> 0x102C (hex) -> 4140 (divided by 1000) -> 4.140 V
Solar Bus Current (uint16_t solar_bus_current):
24 00 -> 0x0024 (hex) -> 36 mA
Boot Counter (uint16_t boot_counter):
01 00 -> 0x0001 (hex) -> 1
Checksum (uint8_t checksum):
17 -> 23
Summary of Decoded Data:
Call Sign: SR0SAT
Frame Number: 6652
Message Type: 1
Transmission Power: 100 mW
Satellite Unix Time: 1724081700
OBC Temperature: 16.4°C
Battery Temperature: 22.9°C
External Temperature: -1.0°C
Base Plate Temperature: 11.3°C
Solar Panel Temperature: 6.9°C
Radiation: 4.4 µSv/h
Bus Voltage: 4131 mV
Bus Current: -0.036 mA
Battery Maximum Capacity: 2682 mAh
Battery Remaining Capacity: 3075 mAh
Solar Bus Voltage: 4.140 V
Solar Bus Current: 36 mA
Boot Counter: 1
Checksum: 23
ChatGPT correction (wrote by PY4ZBZ)
I discovered mistakes that the SR-0 DemoSAT's ChatGPT decoder always
makes: Unix time and Frame number are always decoded wrongly, as the
example shows for Unix Time. (certo=OK, errado=error)
The SatNOGS Dashboard decodes correctly,
as Unix time 5B FF CA 66 (little endian) is worth 66CAFF5B(hex)=
1724579675(dec)=2024-08-25 09:54:35 GMT (06:54:35 localtime=GMT-3):
SR0SAT decoder ver1.2 release, 29 Aug 2024
https://x.com/PY4ZBZ/status/1828410531054592008
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