190 lines
3.4 KiB
Plaintext
190 lines
3.4 KiB
Plaintext
# https://www.gps.gov/technical/icwg/IS-GPS-200E.pdf
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meta:
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id: gps
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endian: be
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bit-endian: be
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seq:
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- id: tlm
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type: tlm
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- id: how
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type: how
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- id: body
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type:
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switch-on: how.subframe_id
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cases:
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1: subframe_1
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2: subframe_2
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3: subframe_3
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4: subframe_4
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types:
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tlm:
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seq:
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- id: magic
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contents: [0x8b]
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- id: tlm
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type: b14
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- id: integrity_status
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type: b1
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- id: reserved
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type: b1
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how:
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seq:
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- id: tow_count
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type: b17
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- id: alert
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type: b1
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- id: anti_spoof
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type: b1
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- id: subframe_id
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type: b3
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- id: reserved
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type: b2
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subframe_1:
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seq:
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# Word 3
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- id: week_no
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type: b10
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- id: code
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type: b2
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- id: sv_accuracy
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type: b4
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- id: sv_health
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type: b6
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- id: iodc_msb
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type: b2
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# Word 4
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- id: l2_p_data_flag
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type: b1
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- id: reserved1
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type: b23
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# Word 5
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- id: reserved2
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type: b24
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# Word 6
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- id: reserved3
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type: b24
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# Word 7
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- id: reserved4
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type: b16
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- id: t_gd
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type: s1
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# Word 8
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- id: iodc_lsb
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type: u1
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- id: t_oc
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type: u2
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# Word 9
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- id: af_2
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type: s1
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- id: af_1
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type: s2
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# Word 10
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- id: af_0_sign
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type: b1
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- id: af_0_value
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type: b21
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- id: reserved5
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type: b2
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instances:
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af_0:
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value: 'af_0_sign ? (af_0_value - (1 << 21)) : af_0_value'
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subframe_2:
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seq:
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# Word 3
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- id: iode
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type: u1
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- id: c_rs
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type: s2
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# Word 4 & 5
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- id: delta_n
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type: s2
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- id: m_0
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type: s4
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# Word 6 & 7
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- id: c_uc
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type: s2
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- id: e
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type: s4
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# Word 8 & 9
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- id: c_us
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type: s2
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- id: sqrt_a
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type: u4
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# Word 10
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- id: t_oe
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type: u2
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- id: fit_interval_flag
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type: b1
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- id: aoda
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type: b5
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- id: reserved
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type: b2
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subframe_3:
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seq:
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# Word 3 & 4
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- id: c_ic
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type: s2
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- id: omega_0
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type: s4
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# Word 5 & 6
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- id: c_is
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type: s2
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- id: i_0
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type: s4
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# Word 7 & 8
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- id: c_rc
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type: s2
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- id: omega
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type: s4
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# Word 9
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- id: omega_dot_sign
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type: b1
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- id: omega_dot_value
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type: b23
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# Word 10
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- id: iode
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type: u1
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- id: idot_sign
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type: b1
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- id: idot_value
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type: b13
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- id: reserved
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type: b2
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instances:
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omega_dot:
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value: 'omega_dot_sign ? (omega_dot_value - (1 << 23)) : omega_dot_value'
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idot:
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value: 'idot_sign ? (idot_value - (1 << 13)) : idot_value'
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subframe_4:
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seq:
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# Word 3
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- id: data_id
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type: b2
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- id: page_id
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type: b6
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- id: body
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type:
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switch-on: page_id
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cases:
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56: ionosphere_data
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types:
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ionosphere_data:
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seq:
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- id: a0
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type: s1
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- id: a1
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type: s1
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- id: a2
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type: s1
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- id: a3
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type: s1
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- id: b0
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type: s1
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- id: b1
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type: s1
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- id: b2
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type: s1
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- id: b3
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type: s1
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