How to get JSON data on ajax call every 10secs

Question

Here is code.When i run this code it's to get the data product_id, it's showing alert undefined.but I want to get Latitude Longitude with every 10 secs update.kindly share any idea ASAP

<script type="text/javascript">
startJsonSession();
function startJsonSession(){
$.ajax({
url: "next28.php",
cache: false,
dataType: "json",
complete: function(data) {
pid = data.Latitude;
alert(pid);
}
});
}
<script>

JSON output from next28.php:

 

{"LiveDataJSon":[{"Latitude":11.712140,"Longitude":78.054493,"Speed":0.00,"PositionTime":"16/Mar/2019 11:18:18 AM","PositionType":"GPS","Direction":"East","ACC":"Off","Battery":"100%","GSMStrength":"Strong Signal","PowerStatus":"Power Connected"}]}