Recent content by nauman

Hi all I have a underwater hydrophone with known receive sensitivity e.g. -190dB ref 1v/upa with a preamplifier having gain of 40dB at frequency e.g. 200Hz. I measure preamplifier output using spectrum analyzer and it gives PSD of around -80dBvrms/sqrtHz. I need to convert this PSD value into...

I am able to simulate by adding a small resistance in series with source V1 and grounding the source but still output is not correct i.e. 1mVpp across 50 ohm load whereas it should be around 800mVpp!

Thanks very much for help. I think you are right. I have problem in simulating the transformer in Orcad Capture as i am trying to simulate filter circuit connected with Q01 collector standalone and have following errors! "ERROR -- Node N27120 is floating ERROR -- Node N27066 is floating ERROR --...

Hi all I am trying to simulate input stage of a variable gain preamplifier for acoustic hydrophone operating in frequency range of 90KHz to 110KHz. It is transistor based preamplifier. The gain of preamplifier (Q01) is controlled through dc control voltage (Vc) connected with base of Q04...

Yes, i meant Lat/Long data in digital format

Thanks for help. Is there any micro controller/ICs which can do these tasks?

The existing circuitry is designed for audio frequency range only

GPS data needs to be send after every 3 to 4 seconds

Hi all I need to add GPS digital output (in form of Lat/Long) in an existing analog audio signal whose bandwidth is 100 Hz-20 KHz. This GPS data should be added in such a way that it should not interfere with audio signal neither total bandwidth of analog signal should exceed 40 KHz. This...

Yes you are right that noise will have to be catered. However, what about delays which are greater than one cycle length? As I have understood so far, cross correlation techniques can measure only those delays accurately which are less than one cycle length in case of single frequency signals...

Unfortunately no. Still searching for some clue.

These two signals are from two sensors which are some distance apart and the delays estimated using cross correlation will be utilised for bearing estimation. I am stuck here how to proceed? According to literature, bearing estimation using delay measurements is a standard technique being used.

Hi Suppose there are two continuous signals of same frequency say 4 KHz. The time corresponding to its one cycle is around 250 us. If we delay one signal by 4010 us (i.e >> one cycle delay), can we use cross correlation techniques to estimate this delay accurately? Thanks

Hi all Is there any commercial IC available used for composite signal generation in DIFAR Sonobuoys? Thanks

I am simulating signals on two hydrophones H1 and H2 of linear array which are at a distance 'd' from each other. The geometry is shown below: Assuming Plane Wave assumption, there will be some 'delay_' b/w 8.5KHz source signal arriving at H1 and H2 assuming zero noise and pure sinusoidal...