import os
import time
import math
import numpy as np
import torch
import matplotlib.pyplot as plt

# =========================================================
# 0. 全局设置
# =========================================================
plt.rcParams['axes.unicode_minus'] = False
plt.rcParams['font.sans-serif'] = ['Microsoft YaHei']
plt.rcParams['mathtext.fontset'] = 'stix'

device = torch.device("cuda" if torch.cuda.is_available() else "cpu")
torch.manual_seed(2024)
np.random.seed(2024)

print(f"使用设备: {device}")

SAVE_DIR = "analysis_results_ula_nula"
os.makedirs(SAVE_DIR, exist_ok=True)

ARRAY_TYPES = ["ULA", "NULA"]

# =========================================================
# 1. 基本参数
# =========================================================
N_ant_default = 24
N_RF_default = 4
target_angle_default = 5.0
clutter_angle_default = -15.0
noise_power = 1.0
INR_linear = 10 ** (30 / 10)
L_snapshots = 100

# 分析配置
SNR_dB_test = 10
Monte_Carlo_test = 80
SCAN_STEP = 0.02

# 颜色
method_colors = {
    "Analog": "#77AC30",
    "Digital": "#000000",
    "DFT": "#4DBEEE",
    "OMP": "#D95319",
    "TSC-OMP": "#0072BD",
}
array_colors = {
    "ULA": "#7E2F8E",
    "NULA": "#EDB120",
}

# =========================================================
# 2. 阵列几何
# =========================================================
def get_positions_lambda(array_type: str, N_ant: int):
    """
    返回阵列位置，单位统一为“波长 λ”
    - ULA: 半波长均匀线阵
    - NULA:
        * N_ant == 24 时，严格复刻你现有主线脚本中的非均匀阵列物理位置
        * 否则使用一个可复现的广义非均匀阵列，用于复杂度规模扫描
    """
    array_type = array_type.upper()

    if array_type == "ULA":
        pos = 0.5 * np.arange(-(N_ant - 1) / 2, (N_ant - 1) / 2 + 1)
        return pos.astype(np.float32)

    # 精确复刻你当前 NULA 主线
    if array_type == "NULA" and N_ant == 24:
        fc = 4.9e9
        lam = 3e8 / fc
        a = np.arange(0, 11 * 43 + 1, 43)
        b = np.array([11 * 43 + 63])
        c = 11 * 43 + 63 + np.arange(43, 11 * 43 + 1, 43)
        delta_d = 1e-3 * np.concatenate((a, b, c))  # meter
        pos = delta_d / lam
        return pos.astype(np.float32)

    # 广义 NULA，用于 N_ant != 24 的复杂度缩放分析
    base = 0.5 * np.arange(N_ant)
    jitter = 0.08 * np.sin(np.linspace(0, 3 * np.pi, N_ant))
    pos = base + jitter
    pos = pos - np.mean(pos)
    return pos.astype(np.float32)


def gen_a(theta_deg, N_ant, array_type="NULA"):
    """
    导向矢量，统一使用 exp(-j 2π p sinθ)
    p 为以 λ 为单位的阵元位置
    """
    pos = get_positions_lambda(array_type, N_ant)
    pos_t = torch.tensor(pos, dtype=torch.float32, device=device).unsqueeze(1)
    theta_rad = torch.deg2rad(torch.tensor(theta_deg, dtype=torch.float32, device=device))
    return torch.exp(-1j * 2 * torch.pi * pos_t * torch.sin(theta_rad))


def build_dictionary(angle_grid, N_ant, array_type="NULA"):
    return torch.cat(
        [gen_a(float(th), N_ant, array_type) / math.sqrt(N_ant) for th in angle_grid],
        dim=1
    )


def sync_if_needed():
    if device.type == "cuda":
        torch.cuda.synchronize()


# =========================================================
# 3. 五种架构模块
# =========================================================
def extract_omp(w_opt, A_dic, N_RF):
    """
    传统 OMP / TSC-OMP 公用提取函数
    """
    res = w_opt.clone()
    F_RF = None
    for _ in range(N_RF):
        proj = A_dic.mH @ res
        idx = torch.argmax(torch.abs(proj))
        atom = A_dic[:, idx:idx+1]
        F_RF = atom if F_RF is None else torch.cat((F_RF, atom), dim=1)
        res = w_opt - F_RF @ (torch.linalg.pinv(F_RF) @ w_opt)
    return F_RF


def build_dft_rf(theta_prior, window_half_width, N_ant, N_RF, array_type="NULA"):
    angles_dft = torch.linspace(
        theta_prior - window_half_width,
        theta_prior + window_half_width,
        N_RF,
        device=device
    )
    return torch.cat(
        [gen_a(float(th), N_ant, array_type) / math.sqrt(N_ant) for th in angles_dft],
        dim=1
    )


def make_prior_broad(theta_prior, window_half_width, N_ant, array_type="NULA"):
    a_prior_broad = torch.zeros((N_ant, 1), dtype=torch.complex64, device=device)
    for tb in torch.arange(
        theta_prior - window_half_width,
        theta_prior + window_half_width + 0.1,
        0.5,
        device=device
    ):
        a_prior_broad += gen_a(float(tb), N_ant, array_type)
    a_prior_broad /= torch.norm(a_prior_broad)
    return a_prior_broad


def calc_hybrid_weight(F_RF, a_target, R_in, N_RF):
    a_eff = F_RF.mH @ a_target
    R_eff = F_RF.mH @ R_in @ F_RF
    R_eff = R_eff + (0.05 * torch.trace(R_eff).real / N_RF) * torch.eye(N_RF, device=device)
    inv_R_eff = torch.linalg.inv(R_eff)
    F_BB = (inv_R_eff @ a_eff) / (a_eff.mH @ inv_R_eff @ a_eff)
    w = F_RF @ F_BB
    return w / torch.norm(w)


def build_all_structures(true_target_angle, clutter_angle, N_ant, N_RF,
                         theta_prior, window_half_width, array_type="NULA"):
    """
    构建五种架构所需的静态权值/射频矩阵
    """
    a_target = gen_a(true_target_angle, N_ant, array_type)
    a_clutter = gen_a(clutter_angle, N_ant, array_type)

    R_interf = noise_power * torch.eye(N_ant, device=device) + INR_linear * (a_clutter @ a_clutter.mH)

    # 用于 OMP / TSC-OMP 的先验宽波束
    a_prior_broad = make_prior_broad(theta_prior, window_half_width, N_ant, array_type)
    w_digital_prior = torch.linalg.inv(R_interf) @ a_prior_broad
    w_digital_prior /= torch.norm(w_digital_prior)

    full_grid = np.arange(-90, 90.5, 0.5)
    tsc_grid = np.arange(
        theta_prior - window_half_width,
        theta_prior + window_half_width + 0.1,
        0.1
    )

    A_dic_full = build_dictionary(full_grid, N_ant, array_type)
    A_dic_tsc = build_dictionary(tsc_grid, N_ant, array_type)

    F_RF_dft = build_dft_rf(theta_prior, window_half_width, N_ant, N_RF, array_type)
    F_RF_omp = extract_omp(w_digital_prior, A_dic_full, N_RF)
    F_RF_tsc = extract_omp(w_digital_prior, A_dic_tsc, N_RF)

    # 静态协方差，用于纯数字与混合权值展示
    sig_power_static = 10 ** (0 / 10)
    R_static = (noise_power * torch.eye(N_ant, device=device)
                + sig_power_static * (a_target @ a_target.mH)
                + INR_linear * (a_clutter @ a_clutter.mH))
    R_static_dl = R_static + (0.01 * torch.trace(R_static).real / N_ant) * torch.eye(N_ant, device=device)

    # 纯模拟
    w_analog = a_target / torch.norm(a_target)

    # 纯数字 MVDR
    inv_R = torch.linalg.inv(R_static_dl)
    w_digital = (inv_R @ a_target) / (a_target.mH @ inv_R @ a_target)
    w_digital = w_digital / torch.norm(w_digital)

    return {
        "a_target": a_target,
        "a_clutter": a_clutter,
        "w_analog": w_analog,
        "w_digital": w_digital,
        "F_RF_dft": F_RF_dft,
        "F_RF_omp": F_RF_omp,
        "F_RF_tsc": F_RF_tsc,
    }


# =========================================================
# 4. 统一 RMSE 评估
# =========================================================
def estimate_rmse_all_methods(true_target_angle, clutter_angle, N_ant, N_RF,
                              snr_db, theta_prior, window_half_width,
                              array_type="NULA", mc=80, scan_step=0.02):
    """
    返回:
    analog_rmse, digital_rmse, dft_rmse, omp_rmse, tsc_rmse
    """
    sig_power = 10 ** (snr_db / 10)

    structures = build_all_structures(
        true_target_angle, clutter_angle, N_ant, N_RF,
        theta_prior, window_half_width, array_type
    )

    a_target = structures["a_target"]
    a_clutter = structures["a_clutter"]
    w_analog = structures["w_analog"]
    w_digital = structures["w_digital"]
    F_RF_dft = structures["F_RF_dft"]
    F_RF_omp = structures["F_RF_omp"]
    F_RF_tsc = structures["F_RF_tsc"]

    scan_grid = torch.arange(
        theta_prior - window_half_width,
        theta_prior + window_half_width + 0.001,
        scan_step,
        device=device
    )
    A_scan = torch.cat([gen_a(float(th), N_ant, array_type) for th in scan_grid], dim=1)

    s_t = np.sqrt(sig_power / 2) * (
        torch.randn(mc, 1, L_snapshots, device=device) +
        1j * torch.randn(mc, 1, L_snapshots, device=device)
    )
    s_c = np.sqrt(INR_linear / 2) * (
        torch.randn(mc, 1, L_snapshots, device=device) +
        1j * torch.randn(mc, 1, L_snapshots, device=device)
    )
    n_t = np.sqrt(noise_power / 2) * (
        torch.randn(mc, N_ant, L_snapshots, device=device) +
        1j * torch.randn(mc, N_ant, L_snapshots, device=device)
    )
    X = a_target.unsqueeze(0) * s_t + a_clutter.unsqueeze(0) * s_c + n_t

    # -------- 纯模拟：Bartlett --------
    P_ana = torch.abs(torch.einsum('si,bij,js->bs', A_scan.conj().T, torch.bmm(X, X.mH) / L_snapshots, A_scan))
    ang_ana = scan_grid[torch.argmax(P_ana, dim=1)]

    # -------- 纯数字 MVDR：Capon --------
    R_in = torch.bmm(X, X.mH) / L_snapshots
    trace_R_in = torch.diagonal(R_in, dim1=-2, dim2=-1).sum(-1).real
    R_in_dl = R_in + (0.05 * trace_R_in / N_ant).view(-1, 1, 1) * torch.eye(N_ant, device=device).unsqueeze(0)
    inv_R_in = torch.linalg.inv(R_in_dl)
    P_dig = 1.0 / torch.abs(torch.einsum('si,bij,js->bs', A_scan.conj().T, inv_R_in, A_scan))
    ang_dig = scan_grid[torch.argmax(P_dig, dim=1)]

    # -------- 混合三种 --------
    def process_hybrid(F_RF):
        A_eff = F_RF.mH @ A_scan
        Y = F_RF.mH.unsqueeze(0) @ X
        R_hyb = torch.bmm(Y, Y.mH) / L_snapshots
        trace_R = torch.diagonal(R_hyb, dim1=-2, dim2=-1).sum(-1).real
        R_hyb = R_hyb + (0.05 * trace_R / N_RF).view(-1, 1, 1) * torch.eye(N_RF, device=device).unsqueeze(0)
        inv_R_hyb = torch.linalg.inv(R_hyb)
        P = 1.0 / torch.abs(torch.einsum('si,bij,js->bs', A_eff.conj().T, inv_R_hyb, A_eff))
        return scan_grid[torch.argmax(P, dim=1)]

    ang_dft = process_hybrid(F_RF_dft)
    ang_omp = process_hybrid(F_RF_omp)
    ang_tsc = process_hybrid(F_RF_tsc)

    def rmse(x):
        return torch.sqrt(torch.mean((x - true_target_angle) ** 2)).item()

    return rmse(ang_ana), rmse(ang_dig), rmse(ang_dft), rmse(ang_omp), rmse(ang_tsc)


# =========================================================
# 5. 复杂度分析
# =========================================================
def complexity_proxy(N_ant, N_RF, D_full, D_tsc):
    """
    五种架构的复杂度代理量
    """
    c_ana = N_ant
    c_dig = N_ant ** 3
    c_dft = N_ant * N_RF + N_RF ** 3
    c_omp = N_RF * N_ant * D_full + N_RF ** 4
    c_tsc = N_RF * N_ant * D_tsc + N_RF ** 4
    return c_ana, c_dig, c_dft, c_omp, c_tsc


def run_complexity_analysis():
    print("\n========== 开始复杂度分析（ULA + NULA） ==========")

    target_angle = target_angle_default
    clutter_angle = clutter_angle_default
    N_RF = N_RF_default
    window_half_width = 5.0
    repeat_times = 20

    N_ant_list = [8, 12, 16, 20, 24, 28, 32]
    results_runtime = {}
    results_proxy = {}

    for array_type in ARRAY_TYPES:
        print(f"\n--- 复杂度分析: {array_type} ---")
        t_ana, t_dig, t_dft, t_omp, t_tsc = [], [], [], [], []
        c_ana_list, c_dig_list, c_dft_list, c_omp_list, c_tsc_list = [], [], [], [], []

        for N_ant in N_ant_list:
            a_target = gen_a(target_angle, N_ant, array_type)
            a_clutter = gen_a(clutter_angle, N_ant, array_type)

            theta_prior = round(target_angle)
            full_grid = np.arange(-90, 90.5, 0.5)
            tsc_grid = np.arange(theta_prior - window_half_width,
                                 theta_prior + window_half_width + 0.1,
                                 0.1)

            A_dic_full = build_dictionary(full_grid, N_ant, array_type)
            A_dic_tsc = build_dictionary(tsc_grid, N_ant, array_type)

            R_interf = noise_power * torch.eye(N_ant, device=device) + INR_linear * (a_clutter @ a_clutter.mH)
            a_prior_broad = make_prior_broad(theta_prior, window_half_width, N_ant, array_type)

            # 纯模拟
            sync_if_needed()
            tic = time.perf_counter()
            for _ in range(repeat_times):
                _ = a_target / torch.norm(a_target)
            sync_if_needed()
            t_ana.append((time.perf_counter() - tic) / repeat_times * 1e3)

            # 纯数字 MVDR
            sync_if_needed()
            tic = time.perf_counter()
            for _ in range(repeat_times):
                R_static = (noise_power * torch.eye(N_ant, device=device)
                            + (a_target @ a_target.mH)
                            + INR_linear * (a_clutter @ a_clutter.mH))
                R_static_dl = R_static + (0.01 * torch.trace(R_static).real / N_ant) * torch.eye(N_ant, device=device)
                inv_R = torch.linalg.inv(R_static_dl)
                _ = (inv_R @ a_target) / (a_target.mH @ inv_R @ a_target)
            sync_if_needed()
            t_dig.append((time.perf_counter() - tic) / repeat_times * 1e3)

            # DFT
            sync_if_needed()
            tic = time.perf_counter()
            for _ in range(repeat_times):
                F_RF_dft = build_dft_rf(theta_prior, window_half_width, N_ant, N_RF, array_type)
                R_static = (noise_power * torch.eye(N_ant, device=device)
                            + (a_target @ a_target.mH)
                            + INR_linear * (a_clutter @ a_clutter.mH))
                _ = calc_hybrid_weight(F_RF_dft, a_target, R_static, N_RF)
            sync_if_needed()
            t_dft.append((time.perf_counter() - tic) / repeat_times * 1e3)

            # OMP/TSC
            w_digital_prior = torch.linalg.inv(R_interf) @ a_prior_broad
            w_digital_prior /= torch.norm(w_digital_prior)

            sync_if_needed()
            tic = time.perf_counter()
            for _ in range(repeat_times):
                _ = extract_omp(w_digital_prior, A_dic_full, N_RF)
            sync_if_needed()
            t_omp.append((time.perf_counter() - tic) / repeat_times * 1e3)

            sync_if_needed()
            tic = time.perf_counter()
            for _ in range(repeat_times):
                _ = extract_omp(w_digital_prior, A_dic_tsc, N_RF)
            sync_if_needed()
            t_tsc.append((time.perf_counter() - tic) / repeat_times * 1e3)

            c_ana, c_dig, c_dft, c_omp, c_tsc = complexity_proxy(
                N_ant, N_RF, len(full_grid), len(tsc_grid)
            )
            c_ana_list.append(c_ana)
            c_dig_list.append(c_dig)
            c_dft_list.append(c_dft)
            c_omp_list.append(c_omp)
            c_tsc_list.append(c_tsc)

        results_runtime[array_type] = {
            "N_ant": N_ant_list,
            "Analog": t_ana,
            "Digital": t_dig,
            "DFT": t_dft,
            "OMP": t_omp,
            "TSC-OMP": t_tsc,
        }
        results_proxy[array_type] = {
            "N_ant": N_ant_list,
            "Analog": c_ana_list,
            "Digital": c_dig_list,
            "DFT": c_dft_list,
            "OMP": c_omp_list,
            "TSC-OMP": c_tsc_list,
        }

        # 每种阵列单独出图
        plt.figure(figsize=(10, 6))
        for method in ["Analog", "Digital", "DFT", "OMP", "TSC-OMP"]:
            plt.plot(N_ant_list, results_runtime[array_type][method], linewidth=2, label=method, color=method_colors[method])
        plt.grid(True, ls='--', alpha=0.6)
        plt.xlabel('阵元数 N_ant')
        plt.ylabel('平均运行时间 (ms)')
        plt.title(f'复杂度分析：运行时间随阵元数变化 ({array_type})')
        plt.legend()
        plt.tight_layout()
        plt.savefig(os.path.join(SAVE_DIR, f'complexity_runtime_vs_ant_{array_type}.png'), dpi=300)
        plt.show()

        plt.figure(figsize=(10, 6))
        for method in ["Analog", "Digital", "DFT", "OMP", "TSC-OMP"]:
            plt.plot(N_ant_list, results_proxy[array_type][method], linewidth=2, label=method, color=method_colors[method])
        plt.grid(True, ls='--', alpha=0.6)
        plt.xlabel('阵元数 N_ant')
        plt.ylabel('复杂度代理量')
        plt.title(f'复杂度分析：复杂度代理量随阵元数变化 ({array_type})')
        plt.legend()
        plt.tight_layout()
        plt.savefig(os.path.join(SAVE_DIR, f'complexity_proxy_vs_ant_{array_type}.png'), dpi=300)
        plt.show()

    # ULA vs NULA 对照图（固定 24 阵元）
    idx_24 = N_ant_list.index(24)
    methods = ["Analog", "Digital", "DFT", "OMP", "TSC-OMP"]
    ula_vals = [results_runtime["ULA"][m][idx_24] for m in methods]
    nula_vals = [results_runtime["NULA"][m][idx_24] for m in methods]

    x = np.arange(len(methods))
    width = 0.35

    plt.figure(figsize=(10, 6))
    plt.bar(x - width/2, ula_vals, width, label='ULA', color=array_colors["ULA"])
    plt.bar(x + width/2, nula_vals, width, label='NULA', color=array_colors["NULA"])
    plt.xticks(x, methods)
    plt.ylabel('平均运行时间 (ms)')
    plt.title('复杂度分析：24阵元下 ULA 与 NULA 运行时间对比')
    plt.grid(True, axis='y', ls='--', alpha=0.5)
    plt.legend()
    plt.tight_layout()
    plt.savefig(os.path.join(SAVE_DIR, 'complexity_runtime_compare_ULA_NULA_24ant.png'), dpi=300)
    plt.show()

    print("复杂度分析完成。")
    return results_runtime, results_proxy


# =========================================================
# 6. 局限性分析
# =========================================================
def run_limitation_analysis():
    print("\n========== 开始局限性分析（ULA + NULA） ==========")

    N_ant = N_ant_default
    N_RF = N_RF_default
    true_target_angle = target_angle_default
    clutter_angle = clutter_angle_default
    snr_db = SNR_dB_test

    limitation_results = {}

    for array_type in ARRAY_TYPES:
        print(f"\n--- 局限性分析: {array_type} ---")
        limitation_results[array_type] = {}

        # 6.1 先验误差敏感性
        prior_errors = np.arange(-8, 9, 1)
        curves_prior = {m: [] for m in ["Analog", "Digital", "DFT", "OMP", "TSC-OMP"]}

        for e in prior_errors:
            theta_prior = round(true_target_angle) + e
            r = estimate_rmse_all_methods(
                true_target_angle, clutter_angle, N_ant, N_RF,
                snr_db, theta_prior, 5.0, array_type,
                mc=Monte_Carlo_test, scan_step=SCAN_STEP
            )
            for m, v in zip(["Analog", "Digital", "DFT", "OMP", "TSC-OMP"], r):
                curves_prior[m].append(v)

        limitation_results[array_type]["prior_errors"] = prior_errors
        limitation_results[array_type]["prior_curves"] = curves_prior

        plt.figure(figsize=(10, 6))
        for method in ["Analog", "Digital", "DFT", "OMP", "TSC-OMP"]:
            plt.semilogy(prior_errors, curves_prior[method], linewidth=2, label=method, color=method_colors[method])
        plt.grid(True, which='both', ls='--', alpha=0.6)
        plt.xlabel('先验角误差 (°)')
        plt.ylabel('RMSE (°)')
        plt.title(f'局限性分析：先验误差敏感性 ({array_type}, SNR={snr_db}dB)')
        plt.legend()
        plt.tight_layout()
        plt.savefig(os.path.join(SAVE_DIR, f'limitation_prior_error_{array_type}.png'), dpi=300)
        plt.show()

        # 6.2 波门宽度敏感性
        widths = [2, 3, 4, 5, 6, 8, 10]
        curves_width = {m: [] for m in ["Analog", "Digital", "DFT", "OMP", "TSC-OMP"]}

        for w in widths:
            theta_prior = round(true_target_angle)
            r = estimate_rmse_all_methods(
                true_target_angle, clutter_angle, N_ant, N_RF,
                snr_db, theta_prior, float(w), array_type,
                mc=Monte_Carlo_test, scan_step=SCAN_STEP
            )
            for m, v in zip(["Analog", "Digital", "DFT", "OMP", "TSC-OMP"], r):
                curves_width[m].append(v)

        limitation_results[array_type]["widths"] = widths
        limitation_results[array_type]["width_curves"] = curves_width

        plt.figure(figsize=(10, 6))
        for method in ["Analog", "Digital", "DFT", "OMP", "TSC-OMP"]:
            plt.semilogy(widths, curves_width[method], linewidth=2, label=method, color=method_colors[method])
        plt.grid(True, which='both', ls='--', alpha=0.6)
        plt.xlabel('波门半宽 (°)')
        plt.ylabel('RMSE (°)')
        plt.title(f'局限性分析：波门宽度敏感性 ({array_type}, SNR={snr_db}dB)')
        plt.legend()
        plt.tight_layout()
        plt.savefig(os.path.join(SAVE_DIR, f'limitation_window_width_{array_type}.png'), dpi=300)
        plt.show()

        # 6.3 杂波逼近目标时的性能退化
        clutter_list = np.array([-25, -20, -15, -10, -8, -6, -4, -2])
        sep_deg = np.abs(clutter_list - true_target_angle)
        curves_sep = {m: [] for m in ["Analog", "Digital", "DFT", "OMP", "TSC-OMP"]}

        for cang in clutter_list:
            theta_prior = round(true_target_angle)
            r = estimate_rmse_all_methods(
                true_target_angle, float(cang), N_ant, N_RF,
                snr_db, theta_prior, 5.0, array_type,
                mc=Monte_Carlo_test, scan_step=SCAN_STEP
            )
            for m, v in zip(["Analog", "Digital", "DFT", "OMP", "TSC-OMP"], r):
                curves_sep[m].append(v)

        limitation_results[array_type]["sep_deg"] = sep_deg
        limitation_results[array_type]["sep_curves"] = curves_sep

        plt.figure(figsize=(10, 6))
        for method in ["Analog", "Digital", "DFT", "OMP", "TSC-OMP"]:
            plt.semilogy(sep_deg, curves_sep[method], linewidth=2, label=method, color=method_colors[method])
        plt.grid(True, which='both', ls='--', alpha=0.6)
        plt.xlabel('目标-杂波角距 |θ_t-θ_c| (°)')
        plt.ylabel('RMSE (°)')
        plt.title(f'局限性分析：杂波逼近目标时的性能退化 ({array_type})')
        plt.legend()
        plt.tight_layout()
        plt.savefig(os.path.join(SAVE_DIR, f'limitation_clutter_separation_{array_type}.png'), dpi=300)
        plt.show()

    # ---------------- ULA vs NULA 对照图（重点方法可读性更高） ----------------
    # 先验误差：比较 TSC-OMP
    plt.figure(figsize=(10, 6))
    for array_type in ARRAY_TYPES:
        x = limitation_results[array_type]["prior_errors"]
        y = limitation_results[array_type]["prior_curves"]["TSC-OMP"]
        plt.semilogy(x, y, linewidth=2.5, label=f'TSC-OMP ({array_type})', color=array_colors[array_type])
    plt.grid(True, which='both', ls='--', alpha=0.6)
    plt.xlabel('先验角误差 (°)')
    plt.ylabel('RMSE (°)')
    plt.title('ULA 与 NULA 对照：TSC-OMP 先验误差敏感性')
    plt.legend()
    plt.tight_layout()
    plt.savefig(os.path.join(SAVE_DIR, 'compare_prior_error_TSC_ULA_NULA.png'), dpi=300)
    plt.show()

    # 波门宽度：比较 TSC-OMP
    plt.figure(figsize=(10, 6))
    for array_type in ARRAY_TYPES:
        x = limitation_results[array_type]["widths"]
        y = limitation_results[array_type]["width_curves"]["TSC-OMP"]
        plt.semilogy(x, y, linewidth=2.5, label=f'TSC-OMP ({array_type})', color=array_colors[array_type])
    plt.grid(True, which='both', ls='--', alpha=0.6)
    plt.xlabel('波门半宽 (°)')
    plt.ylabel('RMSE (°)')
    plt.title('ULA 与 NULA 对照：TSC-OMP 波门宽度敏感性')
    plt.legend()
    plt.tight_layout()
    plt.savefig(os.path.join(SAVE_DIR, 'compare_window_width_TSC_ULA_NULA.png'), dpi=300)
    plt.show()

    # 杂波逼近：比较 TSC-OMP
    plt.figure(figsize=(10, 6))
    for array_type in ARRAY_TYPES:
        x = limitation_results[array_type]["sep_deg"]
        y = limitation_results[array_type]["sep_curves"]["TSC-OMP"]
        plt.semilogy(x, y, linewidth=2.5, label=f'TSC-OMP ({array_type})', color=array_colors[array_type])
    plt.grid(True, which='both', ls='--', alpha=0.6)
    plt.xlabel('目标-杂波角距 |θ_t-θ_c| (°)')
    plt.ylabel('RMSE (°)')
    plt.title('ULA 与 NULA 对照：TSC-OMP 杂波邻近敏感性')
    plt.legend()
    plt.tight_layout()
    plt.savefig(os.path.join(SAVE_DIR, 'compare_clutter_sep_TSC_ULA_NULA.png'), dpi=300)
    plt.show()

    print("局限性分析完成。")
    return limitation_results


# =========================================================
# 7. 主程序
# =========================================================
if __name__ == "__main__":
    runtime_results, proxy_results = run_complexity_analysis()
    limitation_results = run_limitation_analysis()
    print("\n全部分析完成，结果保存在:", SAVE_DIR)