working version

data_acq_and_processing/processing/data_processor/include/processing_live_config.hpp

@@ -49,6 +49,9 @@ struct ProcessingLiveConfig {
     bool gpr_background_subtract_enabled = true;
     std::uint32_t gpr_background_mean_count = 10U;
     bool gpr_remove_sidelobe_objects_enabled = true;
+    // BP image is computed in the y=imaging_plane_y_m slice of the 3D grid.
+    // Default 0 keeps legacy 1D antenna layouts imaging in the antenna plane.
+    float gpr_imaging_plane_y_m = 0.0F;
     bool reprocess_current_result = true;
     std::uint64_t history_command_seq = 0;
     HistoryCommand history_command = HistoryCommand::None;

data_acq_and_processing/processing/data_processor/src/processing_live_config.cpp

@@ -305,6 +305,12 @@ void apply_legacy_gpr_algorithm_alias(ProcessingLiveConfig& config, const std::s
         }
         config.gpr_remove_sidelobe_objects_enabled = found->get<bool>();
     }
+    if (const auto found = root.find("gpr_imaging_plane_y_m"); found != root.end()) {
+        if (!found->is_number()) {
+            throw std::runtime_error("processing.gpr_imaging_plane_y_m must be number");
+        }
+        config.gpr_imaging_plane_y_m = static_cast<float>(found->get<double>());
+    }
     if (const auto found = root.find("reprocess_current_result"); found != root.end()) {
         if (!found->is_boolean()) {
             throw std::runtime_error("processing.reprocess_current_result must be bool");