Update GPR and SAR3D processing

run_configs/run_config.json

@@ -142,7 +142,6 @@
     }
   },
   "gpr": {
-    "relative_permittivity": 1.0,
     "tx_geometry": [
       {
         "output_pos": 0,
@@ -265,31 +264,6 @@
         "visible_x_max_m": 2.0,
         "visible_z_min_m": 0.0,
         "visible_z_max_m": 14.0
-      },
-      "legacy_gpr": {
-        "mode": "point",
-        "input_positions": "0,1,2,3",
-        "output_positions": "0,1",
-        "min_depth_m": 2.0,
-        "max_depth_m": 14.0,
-        "comp_power": 0.2,
-        "start_freq_mhz": 3000.0,
-        "stop_freq_mhz": 6000.0,
-        "speed_m_s": 0.0,
-        "ignore_socket_speed_enabled": false,
-        "look_angle_deg": 0.0,
-        "apply_freq_phase_correction": true,
-        "reference_mode": "frame_center",
-        "snr_thresh": 4.5,
-        "snr_comp_max": 25.0,
-        "background_subtract_enabled": true,
-        "background_mean_count": 10,
-        "render_mode": "heatmap",
-        "min_visible_pair_count": 1,
-        "visible_x_min_m": -2.0,
-        "visible_x_max_m": 2.0,
-        "visible_z_min_m": 0.0,
-        "visible_z_max_m": 14.0
       }
     },
     "data_actions": {