kopia lustrzana https://github.com/cyoung/stratux
Add emergency status to traffic msgs; additional UAT statistics; cleanup
Keith Tschohl
rodzic
950c0594bf
commit
318e883db5
141
main/traffic.go
141
main/traffic.go
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@ -97,6 +97,7 @@ type TrafficInfo struct {
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Speed_valid bool // set when speed report received.
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Vvel int16 // feet per minute
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Timestamp time.Time // timestamp of traffic message, UTC
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PriorityStatus uint8 // Emergency or priority code as defined in GDL90 spec, DO-260B (Type 28 msg) and DO-282B
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// Parameters starting at 'Age' are calculated from last message receipt on each call of sendTrafficUpdates().
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// Mode S transmits position and track in separate messages, and altitude can also be
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@ -348,6 +349,9 @@ func makeTrafficReportMsg(ti TrafficInfo) []byte {
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msg[19+i] = c
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}
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//msg[27] is priority / emergency status per GDL90 spec (DO260B and DO282B are same codes)
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msg[27] = ti.PriorityStatus << 4
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return prepareMessage(msg)
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}
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@ -394,68 +398,107 @@ func parseDownlinkReport(s string, signalLevel int) {
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// Extract parameters from Mode Status elements, if available.
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if msg_type == 1 || msg_type == 3 {
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// Determine UAT message version. This is needed for some capability decoding and is useful for debugging.
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uat_version = (frame[23] >> 2) % 0x08
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//log.Printf("%06X: UAT version %v\n",icao_addr,uat_version)
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uat_version = (frame[23] >> 2) & 0x07
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// Extract emitter category.
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if msg_type == 1 || msg_type == 3 {
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v := (uint16(frame[17]) << 8) | (uint16(frame[18]))
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ti.Emitter_category = uint8((v / 1600) % 40)
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// Decode callsign or Flight Plan ID (i.e. squawk code)
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// If the CSID bit (byte 27, bit 7) is set to 1, all eight characters
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// encoded in bytes 18-23 represent callsign.
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// If the CSID bit is set to 0, the first four characters encoded in bytes 18-23
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// represent the Mode A squawk code.
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v := (uint16(frame[17]) << 8) | (uint16(frame[18]))
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ti.Emitter_category = uint8((v / 1600) % 40)
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csid := (frame[26] >> 1) & 0x01
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// Decode callsign or Flight Plan ID (i.e. squawk code)
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// If the CSID bit (byte 27, bit 7) is set to 1, all eight characters
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// encoded in bytes 18-23 represent callsign.
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// If the CSID bit is set to 0, the first four characters encoded in bytes 18-23
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// represent the Mode A squawk code.
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if csid == 1 { // decode as callsign
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//log.Printf("CSID == 1. Decoding callsign.\n")
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base40_alphabet := string("0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ ..")
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tail := ""
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csid := (frame[26] >> 1) & 0x01
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v := (uint16(frame[17]) << 8) | uint16(frame[18])
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tail += string(base40_alphabet[(v/40)%40])
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tail += string(base40_alphabet[v%40])
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v = (uint16(frame[19]) << 8) | uint16(frame[20])
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tail += string(base40_alphabet[(v/1600)%40])
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tail += string(base40_alphabet[(v/40)%40])
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tail += string(base40_alphabet[v%40])
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v = (uint16(frame[21]) << 8) | uint16(frame[22])
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tail += string(base40_alphabet[(v/1600)%40])
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tail += string(base40_alphabet[(v/40)%40])
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tail += string(base40_alphabet[v%40])
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tail = strings.Trim(tail, " ")
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ti.Tail = tail
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//log.Printf("Callsign decoded as %s\n",tail)
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if csid == 1 { // decode as callsign
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base40_alphabet := string("0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ ..")
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tail := ""
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} else if uat_version >= 2 { // decode as Mode 3/A code, if UAT version is at least 2
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//log.Printf("CSID == 0. Decoding Mode 3/A code.\n")
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v := (uint16(frame[17]) << 8) | uint16(frame[18])
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squawk_a := (v / 40) % 40
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squawk_b := v % 40
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v = (uint16(frame[19]) << 8) | uint16(frame[20])
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squawk_c := (v / 1600) % 40
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squawk_d := (v / 40) % 40
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squawk := 1000*squawk_a + 100*squawk_b + 10*squawk_c + squawk_d
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ti.Squawk = int(squawk)
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//log.Printf("Mode 3/A decoded as %d\n",squawk)
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}
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v := (uint16(frame[17]) << 8) | uint16(frame[18])
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tail += string(base40_alphabet[(v/40)%40])
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tail += string(base40_alphabet[v%40])
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v = (uint16(frame[19]) << 8) | uint16(frame[20])
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tail += string(base40_alphabet[(v/1600)%40])
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tail += string(base40_alphabet[(v/40)%40])
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tail += string(base40_alphabet[v%40])
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v = (uint16(frame[21]) << 8) | uint16(frame[22])
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tail += string(base40_alphabet[(v/1600)%40])
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tail += string(base40_alphabet[(v/40)%40])
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tail += string(base40_alphabet[v%40])
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tail = strings.Trim(tail, " ")
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ti.Tail = tail
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} else if uat_version >= 2 { // decode as Mode 3/A code, if UAT version is at least 2
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v := (uint16(frame[17]) << 8) | uint16(frame[18])
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squawk_a := (v / 40) % 40
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squawk_b := v % 40
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v = (uint16(frame[19]) << 8) | uint16(frame[20])
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squawk_c := (v / 1600) % 40
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squawk_d := (v / 40) % 40
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squawk := 1000*squawk_a + 100*squawk_b + 10*squawk_c + squawk_d
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ti.Squawk = int(squawk)
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}
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}
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ti.NACp = int((frame[25] >> 4) & 0x0F)
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ti.PriorityStatus = (frame[23] >> 5) & 0x07
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// OK.
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// fmt.Printf("%d, %d, %06X\n", msg_type, ti.Addr_type, ti.Icao_addr)
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// Following section is future-use for debugging and / or additional status info on UAT traffic. Message parsing needs testing.
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/*
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//declaration for mode status flags -- parse for debug logging
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var status_sil byte
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//var status_transmit_mso byte
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var status_sda byte
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//var status_nacv byte
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//var status_nicbaro byte
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//var status_sil_supp byte
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//var status_geom_vert_acc byte
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//var status_sa_flag byte
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var capability_uat_in bool
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var capability_1090_in bool
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//var capability_tcas bool
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//var capability_cdti bool
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//var opmode_tcas_active bool
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//var opmode_ident_active bool
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//var opmode_rec_atc_serv bool
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// these are present in v1 and v2 messages
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status_sil = frame[23] & 0x03
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//status_transmit_mso = frame[24] >> 2
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//status_nacv = (frame[25] >> 1) & 0x07
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//status_nicbaro = frame[25] & 0x01
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// other status and capability bits are different between v1 and v2
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if uat_version == 2 {
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status_sda = frame[24] & 0x03
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capability_uat_in = (frame[26] >> 7) != 0
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capability_1090_in = ((frame[26] >> 6) & 0x01) != 0
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//capability_tcas = ((frame[26] >> 5) & 0x01) != 0
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//opmode_tcas_active = ((frame[26] >> 4) & 0x01) != 0
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//opmode_ident_active = ((frame[26] >> 3) & 0x01) != 0
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//opmode_rec_atc_serv = ((frame[26] >> 2) & 0x01) != 0
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//status_sil_supp = frame[26] & 0x01
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//status_geom_vert_acc = (frame[27] >> 6) & 0x03
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//status_sa_flag = (frame[27] >> 5) & 0x01
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} else if uat_version == 1 {
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//capability_cdti = (frame[26] >> 7) != 0
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//capability_tcas = ((frame[26] >> 6) & 0x01) != 0
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//opmode_tcas_active = ((frame[26] >> 5) & 0x01) != 0
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//opmode_ident_active = ((frame[26] >> 4) & 0x01) != 0
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//opmode_rec_atc_serv = ((frame[26] >> 3) & 0x01) != 0
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}
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log.Printf("Additional UAT mode status for %06X: Version = %d; SIL = %d; SDA = %d; 978 In = %v; 1090 In = %v\n",icao_addr,uat_version,status_sil,status_sda,capability_uat_in,capability_1090_in)
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*/
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}
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ti.NIC = int(frame[11] & 0x0F)
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if (msg_type == 1) || (msg_type == 3) { // Since NACp is passed with normal UATreports, no need to use our ES hack.
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ti.NACp = int((frame[25] >> 4) & 0x0F)
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}
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var power float64
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if signalLevel > 0 {
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power = 20 * (math.Log10(float64(signalLevel) / 1000)) // reported amplitude is 0-1000. Normalize to max = 1 and do amplitude dB calculation (20 dB per decade)
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@ -625,7 +668,6 @@ func parseDownlinkReport(s string, signalLevel int) {
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ti.Last_speed = stratuxClock.Time
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}
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//OK.
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// fmt.Printf("ns_vel %d, ew_vel %d, track %d, speed_valid %t, speed %d, vvel_geo %t, vvel %d\n", ns_vel, ew_vel, track, speed_valid, speed, vvel_geo, vvel)
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/*
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@ -639,7 +681,6 @@ func parseDownlinkReport(s string, signalLevel int) {
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}
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*/
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//OK.
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// fmt.Printf("tisb_site_id %d, utc_coupled %t\n", tisb_site_id, utc_coupled)
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ti.Timestamp = time.Now()
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