Code not registering keyboard inputs

using System.Collections;
using System.Collections.Generic;
using UnityEngine;


public class PlayerMovement : MonoBehaviour
{

    private Animator playerAnimator;
    private float moveHorizontal;
    private float moveVertical;
    private Vector3 movement;
    private float turningSpeed = 20f;
    private Rigidbody playerRigidbody;



    // Use this for initialization

    void Start()
    {

        // Gather components from the Player GameObject

        playerAnimator = GetComponent<Animator>();
        playerRigidbody = GetComponent<Rigidbody>();
    }

    // Update is called once per frame

    void Update()
    {

        // Gather input from the keyboard

        moveHorizontal = Input.GetAxisRaw ("Horizontal");
        moveVertical = Input.GetAxisRaw ("Vertical");

        movement = new Vector3 (moveHorizontal, 0.0f, moveVertical);

    }

    void FixedUpate ()
    {

        //if the players movement vector does not = 0... 

        if (movement != Vector3.zero)
        {

            //...then create a target rotation based on the movement vector...

            Quaternion targetRotation = Quaternion.LookRotation(movement, Vector3.up);

            //and create another rotation that moves from the current rotation to the target rotation

            Quaternion newRotation = Quaternion.Lerp(playerRigidbody.rotation, targetRotation, turningSpeed * Time.deltaTime);

            //..and change the players rotation to the new incremental rotation...

            playerRigidbody.MoveRotation(newRotation);

            //then play the jump animation.

            playerAnimator.SetFloat("Speed", 3f);
        }
        else
        {
            //Otherwise dont play the jump animation

            playerAnimator.SetFloat("Speed", 0f);
        }
    }

}