要在Angular中实现首页重定向带有查询参数的URL，可以按照以下步骤进行操作：

1. 在项目的根目录下打开src/app文件夹，并创建一个名为redirect的组件。

2. 在redirect.component.ts文件中，编写以下代码：

import { Component, OnInit } from '@angular/core';
import { Router } from '@angular/router';

@Component({
  template: ''
})
export class RedirectComponent implements OnInit {

  constructor(private router: Router) { }

  ngOnInit() {
    const queryParams = window.location.search;
    this.router.navigate(['/home'], { queryParams });
  }
}

3. 在redirect.component.spec.ts文件中，编写以下代码：

import { async, ComponentFixture, TestBed } from '@angular/core/testing';
import { RouterTestingModule } from '@angular/router/testing';
import { RedirectComponent } from './redirect.component';

describe('RedirectComponent', () => {
  let component: RedirectComponent;
  let fixture: ComponentFixture;

  beforeEach(async(() => {
    TestBed.configureTestingModule({
      imports: [RouterTestingModule],
      declarations: [RedirectComponent]
    })
    .compileComponents();
  }));

  beforeEach(() => {
    fixture = TestBed.createComponent(RedirectComponent);
    component = fixture.componentInstance;
    fixture.detectChanges();
  });

  it('should create', () => {
    expect(component).toBeTruthy();
  });
});

4. 在app-routing.module.ts文件中，添加一个重定向路由：

import { NgModule } from '@angular/core';
import { RouterModule, Routes } from '@angular/router';
import { RedirectComponent } from './redirect/redirect.component';

const routes: Routes = [
  { path: '', component: RedirectComponent },
  { path: 'home', component: HomeComponent },
  // 其他路由配置
];

@NgModule({
  imports: [RouterModule.forRoot(routes)],
  exports: [RouterModule]
})
export class AppRoutingModule { }

5. 在app.module.ts文件中，将RedirectComponent添加到declarations数组中：

import { NgModule } from '@angular/core';
import { BrowserModule } from '@angular/platform-browser';
import { AppRoutingModule } from './app-routing.module';
import { AppComponent } from './app.component';
import { RedirectComponent } from './redirect/redirect.component';

@NgModule({
  declarations: [
    AppComponent,
    RedirectComponent
  ],
  imports: [
    BrowserModule,
    AppRoutingModule
  ],
  providers: [],
  bootstrap: [AppComponent]
})
export class AppModule { }

现在，当用户访问根URL时，将会重定向到/home路由，并携带原始URL中的查询参数。