spacer: merge satellite view

apps/spacer/spacer.app.js

@@ -1,7 +1,16 @@
-/* -> space race ! */
+/* Space race */
 
 /* 
 
+Performance Assessment of GNSS Signals in
+terms of Time to First Fix for
+Cold, Warm and Hot Start
+Matteo Paonni, Marco Anghileri, Stefan Wallner, José-Ángel Ávila-Rodríguez, Bernd Eissfeller
+Institute of Geodesy and Navigation, University FAF Munich, Germany
+
+=> 22 to 26 dB -- long time / no fix / ...
+=> 26db + -- basically strength no longer matters
+
 apps/assistedgps/custom.html
 
 https://github.com/espruino/EspruinoDocs/blob/master/info/Bangle.js2%20Technical.md#gps
@@ -17,7 +26,7 @@ CFG-PMS z gpssetup to zda se neumi?
 2.11.5 CFG-RATE (0x06 0x04)
 */
 
-/* ui library 0.1.3 */
+/* ui library 0.1.4 */
 let ui = {
   display: 0,
   numScreens: 2,
@@ -83,17 +92,116 @@ let ui = {
   init: function() {
     this.h = this.y2 - this.wi;
     this.drawBusy();
-  }
+  },
+  /* radial angle -- convert 0..1 to 0..2pi */
+  radA: function(p) { return p*(Math.PI*2); },
+  /* radial distance -- convert 0..1 to something that fits on screen */
+  radD: function(d) { return d*(ui.h/2); },
+
+  /* given angle/distance, get X coordinate */
+  radX: function(p, d) {
+    let a = this.radA(p);
+    return this.w/2 + Math.sin(a)*this.radD(d);
+  },
+  /* given angle/distance, get Y coordinate */
+  radY: function(p, d) {
+    let a = this.radA(p);
+    return this.h/2 - Math.cos(a)*this.radD(d) + this.wi;
+  },
+  radLine: function(a1, d1, a2, d2) {
+    g.drawLine(this.radX(a1, d1), this.radY(a1, d1), this.radX(a2, d2), this.radY(a2, d2));
+  },
+  radCircle: function(d) {
+    g.drawCircle(this.radX(0, 0), this.radY(0, 0), this.radD(d));
+    if (1)
+      return;
+    let step = 0.05;
+    for (let i = 0; i < 1; i += 0.05) {
+      this.radLine(i - step, d, i, d);
+    }
+  },
 };
 
-let graw = {
+let fix = {}; /* Global for sky library */
+
+/* sky library v0.1.0 */
+let sky = {
+  sats: [],
+  snum: 0,
+  sats_used: 0,
+  sky_start: -1,
+  this_usable: 0,
+
+  drawGrid: function() {
+    g.setColor(0,0,0);
+    ui.radLine(0, 1, 0.5, 1);
+    ui.radLine(0.25, 1, 0.75, 1);
+    ui.radCircle(0.5);
+    ui.radCircle(1.0);
+  },
+
+  snrLim: 28,
+  drawSat: function(s) {
+    let a = s.azi / 360;
+    let e = ((90 - s.ele) / 90);
+    let x = ui.radX(a, e);
+    let y = ui.radY(a, e);
+
+    if (s.snr == 0)
+      g.setColor(1, 0.25, 0.25);  
+    else if (s.snr < this.snrLim)
+      g.setColor(0.25, 0.5, 0.25);
+    else
+      g.setColor(0, 0, 0);
+    g.drawString(s.id, x, y);
+  },
+
+  // Should correspond to view from below.
+  // https://in-the-sky.org//satmap_radar.php?year=2023&month=10&day=24&skin=1
+  decorate: function() {},
+  drawSats: function(sats) {
+    if (ui.display != 0)
+      return;
+    g.reset()
+      .setColor(1, 1, 1)
+      .fillRect(0, ui.wi, ui.w, ui.y2)
+      .setFont("Vector", 20)
+      .setFontAlign(0, 0);
+    this.drawGrid();
+    sats.forEach(s => this.drawSat(s));
+
+    if (fix && fix.fix && fix.lat) {
+      g.setColor(0, 0, 0)
+       .setFontAlign(-1, 1);
+      g.drawString(fix.satellites + "/" + fix.hdop, 5, ui.y2);
+    }
+    this.decorate();
+  },
+
+  parseSats: function(s) {
+    let view = 1 * s[3];
+    let k = Math.min(4, view - this.snum);
+    for (let i = 4, j = 0; j < k; j++) {
+      let sat = { id: s[i++], ele: 1 * s[i++], azi: 1 * s[i++], snr: s[i++] };
+      if (sat.snr === "")
+        sat.snr = 0;
+      if (sat.snr >= this.snrLim) {
+        this.sats_used++;
+        print(sat.id, sat.snr);
+      }
+      this.sats[this.snum++] = sat;
+    }
+  },
+
   old_msg: {},
   msg: {},
   tof: function(v) { let i = (1*v); return i.toFixed(0); },
   fmtSys: function(sys) {
     return sys.sent + "." + sys.d23 + "D "+ this.tof(sys.pdop) + " " + this.tof(sys.vdop) + "\n";
   },
   display: function() {
+    if (ui.display != 1)
+      return;
     let m = this.old_msg;
     let msg = "" + this.tof(m.time) + "\n" + 
         "q" + m.quality + " " + m.in_view + " " + m.hdop + "\n" +
@@ -107,7 +215,8 @@ let graw = {
       .setFontAlign(-1, -1)
       .drawString(msg, 0, 0);
   },
-  on_raw: function(msg, lost) {
+  parseRaw: function(msg, lost) {
+    if (lost) print("## data lost");
     let s = msg.split(",");
     let cmd = s[0].slice(3);
     //print("cmd", cmd);
@@ -123,6 +232,12 @@ let graw = {
       this.msg.gl = {};
       print("-----------------------------------------------");
       print("GGA Time", s[1], "fix quality", s[4], "sats in view ", s[5]);
+      this.drawSats(this.sats);
+      if (this.sats_used < 5)
+        this.sky_start = getTime();
+      this.snum = 0;
+      this.sats = [];
+      this.sats_used = 0;
       return;
     }
     if (cmd === "GLL") return; /* Position lat/lon */
@@ -149,16 +264,19 @@ let graw = {
     }
     if (s[0] === "$GPGSV") {
       print("Have gps sentences", s[1], "/", s[2]);
+      this.parseSats(s);
       this.msg.gp.sent = ""+s[2];
       return;
     }
     if (s[0] === "$BDGSV") {
       print("Have baidu sentences", s[1], "/", s[2]);
+      this.parseSats(s);
       this.msg.bd.sent = ""+s[2];
       return;
     }
     if (s[0] === "$GLGSV") {
       print("Have glonass sentences", s[1], "/", s[2]);
+      this.parseSats(s);
       this.msg.gl.sent = ""+s[2];
       return;
     }
@@ -193,18 +311,20 @@ let graw = {
 
 function start() {
   Bangle.setGPSPower(1);
-  Bangle.on('GPS-raw', function(a, b) { graw.on_raw(a, b); });
+  Bangle.on('GPS-raw', function(a, b) { sky.parseRaw(a, b); });
   setTimeout(function() {
     Bangle.removeAllListeners('GPS-raw');
   }, 1000000);
-  setInterval(function() { graw.display(); }, 1000);
+  setInterval(function() { sky.display(); }, 1000);
 }
 
 // CASIC_CMD("$PCAS06,0"); /* Query product information */
-setTimeout(() => graw.casic_cmd("$PCAS04,7"), 1000); /* Enable gps + beidou + glonass */
-//setTimeout(() => graw.casic_cmd("$PCAS10,2"), 1200); /* 2: cold start, 1 warm start, 0: hot start */
+setTimeout(() => sky.casic_cmd("$PCAS04,7"), 1000); /* Enable gps + beidou + glonass */
+setTimeout(() => sky.casic_cmd("$PCAS03,1,1,1,1,1,1,1,1"), 1000); /* Enable gps + beidou + glonass */
+
+//setTimeout(() => sky.casic_cmd("$PCAS10,2"), 1200); /* 2: cold start, 1 warm start, 0: hot start */
 
 ui.init();
-ui.topLeft = () => graw.selectSpace();
+ui.topLeft = () => sky.selectSpace();
 Bangle.on("drag", (b) => ui.touchHandler(b));
 start();