I want to measure the udp packets rate which I receive on my pc on a particular port. Is there any application which can show the received udp throughput and its variation with the passage of time.
You can try to sniff the traffic on your host with Wireshark, filter by a certain UDP port and then access to the statistical menu.
Look at this example output:
Follow this link for a brief explanation of Wireshark statical capabilities: Wireshark Statistics